Index
boolean_to_jsval converts a bool argument, b, to a boolean jsval. 19 double_to_jsval jsapi reference, obsolete, spidermonkey double_to_jsval is the inverse of js::tonumber. 20 int_fits_in_jsval jsapi reference, obsolete, spidermonkey determines if a specified c integer value, i, lies within the range allowed for integer jsvals. if so, int_fits_in_jsval returns true, and i can be cast to jsval by calling int_to_jsval(i). otherwise, int_fits_in_jsval returns false. in this case, the application can still convert i to a jsval using js_newnumbervalue. 21 int_to_jsval jsapi reference, obsolete, spidermonkey int_to_jsval converts a c integer, i, to a jsval. 22 js::add*root jsapi reference, needscontent, obsolete, referenc...
...nction compiles a function from a text string chars, bytes, or srcbuf. 33 js::compileoffthread jsapi reference, reference, référence(2), spidermonkey js::compileoffthread compiles a script, chars for execution. 34 js::compileoptions jsapi reference, reference, référence(2), spidermonkey some methods of js::owningcompileoptions and js::compileoptions return the instance itself to allow method chain. 35 js::construct jsapi reference, reference, référence(2), spidermonkey js::construct calls a specified function as a constructor, fun. 36 js::createerror jsapi reference, reference, référence(2), spidermonkey js::createerror creates an error object with specified properties. 37 js::currentglobalor...
...ce, référence(2), spidermonkey js::construct calls a specified function as a constructor, fun. 36 js::createerror jsapi reference, reference, référence(2), spidermonkey js::createerror creates an error object with specified properties. 37 js::currentglobalornull jsapi reference, reference, référence(2), spidermonkey js::currentglobalornull() returns the global object for whatever function is currently running on the context. in other words, it returns the global object on the current scope chain. 38 js::deflatestringtoutf8buffer jsapi reference, refere, spidermonkey js::deflatestringtoutf8buffer encodes src as utf8. the caller must either ensure dst has enough space to encode the entire string, or pass the length of the...
...And 110 more matches

sslfnc.html
her tasks required to run network security services. database files are opened read-only. syntax #include "nss.h" secstatus nss_init(char *configdir); parameter this function has the following parameter: configdir a pointer to a string containing the pathname of the directory where the certificate, key, and security module databases reside. returns the function returns one of these values: if successful, secsuccess. if unsuccessful, secfailure. use pr_geterror to retrieve the error code. description nss_init opens the certn.db, keyn.db, and secmod.db files (wheren is a numeric digit) in the specified directory. nss_init isnot idempotent, so call it only once. nss_init opens the database files read-only. if you are perfor...
... numeric digit) in the specified directory. nss_init isnot idempotent, so call it only once. nss_init opens the database files read-only. if you are performing operations that require write permission, for example s/mime operations such as adding a certificate, use nss_initreadwrite instead. before calling nss_init, your program must call pr_init. the policy flags for all cipher suites are turned off by default, disallowing all cipher suites. therefore, an application cannot use nss to perform any cryptographic operations until after it enables appropriate cipher suites by calling one of the ssl export policy functions: nss_setdomesticpolicy, nss_setexportpolicy, and nss_setfrancepolicy configure the cipher suites for domestic, international, and french versions of software products...
...s_init, nss_initreadwrite provides both read and write access to database files. syntax #include "nss.h" secstatus nss_initreadwrite(char *configdir); parameter this function has the following parameter: configdir a pointer to a string containing the pathname of the directory where the certificate, key, and security module databases reside. returns the function returns one of these values: if successful, secsuccess. if unsuccessful, secfailure. use pr_geterror to retrieve the error code. description nss_initreadwrite opens the certn.db, keyn.db, and secmod.db files (wheren is a numeric digit) with both read and write permission in the specified directory. nss_initreadwrite isnot idempotent, so call it only once. use nss_i...
...And 87 more matches

Index
pconnect components.interfaces is a read-only object whose properties are interfaces indexed by their names. 23 components.interfacesbyid xpcom:language bindings, xpconnect components.interfacesbyid is a read-only array of classes indexed by iid. 24 components.issuccesscode xpcom, xpcom:language bindings, xpconnect determines whether a given xpcom return code (that is, an nsresult value) indicates the success or failure of an operation, returning true or false respectively. 25 components.lastresult xpcom:language bindings, xpconnect no summary! 26 components.manager xpcom:language bindings, xpconnect components.manager is a convenience reflection of the global native component manager service. the scripta...
...entmanager interface can be called directly on this object. 27 components.results xpcom:language bindings, xpconnect components.results is a read-only object whose properties are the names listed as the first parameters of the macros in js/xpconnect/src/xpc.msg (also at table of errors), with the value of each corresponding to that constant's value. 28 components.returncode xpcom:language bindings, xpconnect no summary! 29 components.stack xpcom:language bindings, xpconnect components.stack is a read only property of type nsistackframe (idl definition) that represents a snapshot of the current javascript callstack. this can be used for various diagnostic purposes. 30 components.utils xpcom:language bindings, xpconnec...
...nts.utils.sandbox needsmarkupwork, reference, référence(2), xpcom:language bindings, xpconnect components.utils.sandbox is used to create a sandbox object for use with evalinsandbox(). 32 components.utils.cloneinto this function provides a safe way to take an object defined in a privileged scope and create a structured clone of it in a less-privileged scope. it returns a reference to the clone: 33 components.utils.createobjectin add-ons, developing mozilla, extensions, javascript, reference, référence(2), xpcom:language bindings, xpconnect components.utils.createobjectin creates a new javascript object in the scope of the specified object's compartment. 34 components.utils.evalinsandbox add-ons, developing mozilla, extensi...
...And 82 more matches

WebIDL bindings
che_0(myclass) ns_impl_cycle_collecting_addref(myclass) ns_impl_cycle_collecting_release(myclass) ns_interface_map_begin_cycle_collection(myclass) ns_wrappercache_interface_map_entry ns_interface_map_entry(nsisupports) ns_interface_map_end if your class doesn't inherit from a class that implements getparentobject, then add a function of that name that, for a given instance of your class, returns the same object every time (unless you write explicit code that handles your parent object changing by reparenting js wrappers, as nodes do). the idea is that walking the getparentobject chain will eventually get you to a window, so that every webidl object is associated with a particular window. for example, nsinode::getparentobject returns the node's owner document. the return type of get...
... chain will eventually get you to a window, so that every webidl object is associated with a particular window. for example, nsinode::getparentobject returns the node's owner document. the return type of getparentobject doesn't matter other than it must either singly-inherit from nsisupports or have a corresponding tosupports method that can produce an nsisupports from it. ...
...parentobject doesn't matter other than it must either singly-inherit from nsisupports or have a corresponding tosupports method that can produce an nsisupports from it. (this allows the return value to be implicitly converted to a parentobject instance by the compiler via one of that class's non-explicit constructors.) if many instances of myinterface are expected to be created quicky, the return value of getparentobject should itself inherit from nswrappercache for optimal performance. returning null from getparentobject is allowed in situations in which it's ok to associate the resulting object with a random global object for security purposes; this is not usually ok for things that are exposed to web content. again, if you do not need wrapper caching you don't need to do this. the act...
...And 77 more matches

JXON - Archive of obsolete content
if you have already have a dom tree from using xmlhttprequest, skip to the next paragraph. note: if you are using an instance of xmlhttprequest in order to retrieve your xml file, please use the yourrequest.responsexml property to get a p...
...if you have already have a dom tree from using xmlhttprequest, skip to the next paragraph. note: if you are using an instance of xmlhttprequest in order to retrieve your xml file, please use the yourrequest.responsexml property to get a parsed xml document. don...
...agment or simply an element node. /*\ |*| |*| jxon snippet #1 mdndeveloper network |*| |*| https://developer.mozilla.org/docs/jxon |*| https://developer.mozilla.org/user:fusionchess |*| |*| this framework is released under the gnu public license, version 3 or later. ...
...And 57 more matches

Linear-gradient Generator - CSS: Cascading Style Sheets
0%; margin: 5px 5%; color: #777; position: relative; float: left; } #output .property { height: 100%; width: 12%; position: absolute; left: 0; } #output .value { width: 88%; position: absolute; white-space: pre; word-wrap: break-word; display: block; right: 0; } javascript content var uicolorpicker = (function uicolorpicker() { 'use strict'; function getelembyid(id) { return document.getelementbyid(id); } var subscribers = []; var pickers = []; /** * rgba color class * * hsv/hsb and hsl (hue, saturation, value / brightness, lightness) * @param hue 0-360 * @param saturation 0-100 * @param value 0-100 * @param lightness 0-100 */ function color(color) { if(color instanceof color === true) { this.copy(color); return; } this.r = ...
...ue 0-100 * @param lightness 0-100 */ function color(color) { if(color instanceof color === true) { this.copy(color); return; } this.r = 0; this.g = 0; this.b = 0; this.a = 1; this.hue = 0; this.saturation = 0; this.value = 0; this.lightness = 0; this.format = 'hsv'; } function rgbcolor(r, g, b) { var color = new color(); color.setrgba(r, g, b, 1); return color; } function rgbacolor(r, g, b, a) { var color = new color(); color.setrgba(r, g, b, a); return color; } function hsvcolor(h, s, v) { var color = new color(); color.sethsv(h, s, v); return color; } function hsvacolor(h, s, v, a) { var color = new color(); color.sethsv(h, s, v); color.a = a; return color; } function hslcolor(h, s, l) { var color = new color()...
...(r, g, b, a) { var color = new color(); color.setrgba(r, g, b, a); return color; } function hsvcolor(h, s, v) { var color = new color(); color.sethsv(h, s, v); return color; } function hsvacolor(h, s, v, a) { var color = new color(); color.sethsv(h, s, v); color.a = a; return color; } function hslcolor(h, s, l) { var color = new color(); color.sethsl(h, s, l); return color; } function hslacolor(h, s, l, a) { var color = new color(); color.sethsl(h, s, l); color.a = a; return color; } color.prototype.copy = function copy(obj) { if(obj instanceof color !== true) { console.log('typeof parameter not color'); return; } this.r = obj.r; this.g = obj.g; this.b = obj.b; this.a = obj.a; this.hue = obj.hue; this.saturation = obj.satu...
...And 48 more matches

Color picker tool - CSS: Cascading Style Sheets
olute; opacity: 0; top: -10000px; left: 0; color: #777; float: left; transition: opacity 1s; } #zindex input { border: 1px solid #ddd; font-size: 16px; color: #777; } #zindex .ui-input-slider-info { width: 60px; } #zindex[data-active='true'] { top: 0; opacity: 1; } javascript content 'use strict'; var uicolorpicker = (function uicolorpicker() { function getelembyid(id) { return document.getelementbyid(id); } var subscribers = []; var pickers = []; /** * rgba color class * * hsv/hsb and hsl (hue, saturation, value / brightness, lightness) * @param hue 0-360 * @param saturation 0-100 * @param value 0-100 * @param lightness 0-100 */ function color(color) { if(color instanceof color === true) { this.copy(color); return; } this.r = ...
...ue 0-100 * @param lightness 0-100 */ function color(color) { if(color instanceof color === true) { this.copy(color); return; } this.r = 0; this.g = 0; this.b = 0; this.a = 1; this.hue = 0; this.saturation = 0; this.value = 0; this.lightness = 0; this.format = 'hsv'; } function rgbcolor(r, g, b) { var color = new color(); color.setrgba(r, g, b, 1); return color; } function rgbacolor(r, g, b, a) { var color = new color(); color.setrgba(r, g, b, a); return color; } function hsvcolor(h, s, v) { var color = new color(); color.sethsv(h, s, v); return color; } function hsvacolor(h, s, v, a) { var color = new color(); color.sethsv(h, s, v); color.a = a; return color; } function hslcolor(h, s, l) { var color = new color()...
...(r, g, b, a) { var color = new color(); color.setrgba(r, g, b, a); return color; } function hsvcolor(h, s, v) { var color = new color(); color.sethsv(h, s, v); return color; } function hsvacolor(h, s, v, a) { var color = new color(); color.sethsv(h, s, v); color.a = a; return color; } function hslcolor(h, s, l) { var color = new color(); color.sethsl(h, s, l); return color; } function hslacolor(h, s, l, a) { var color = new color(); color.sethsl(h, s, l); color.a = a; return color; } color.prototype.copy = function copy(obj) { if(obj instanceof color !== true) { console.log('typeof parameter not color'); return; } this.r = obj.r; this.g = obj.g; this.b = obj.b; this.a = obj.a; this.hue = obj.hue; this.saturation = obj.satu...
...And 47 more matches

Starting WebLock
if the object has only registered for one notification, then you can ignore the atopic string and simply handle the event as it occurs. in other words, the observe method should never be called in response to some event for which the object is not registered. ns_imethodimp weblock::observe(nsisupports *asubject, const char *atopic, const prunichar *adata) { return ns_ok; } notification via the observer service is somewhat indirect. the only way to register directly for a notification via the observer service is to instantiate an nsiobserver object. this works for most cases, but consider the case when you have this notification create a component. since the component hasn't been created yet, there are no instantiated nsiobserver objects that can be passe...
...that implements the nsicomponentmanager interface also implements nsiservicemanager, all you have to do is queryinterface the nsicomponentmanager to nsiservicemanager to get the service manager. you can then use the service manager to add the component to the category: nsresult rv; nscomptr<nsiservicemanager> servman = do_queryinterface((nsisupports*)acompmgr, &rv); if (ns_failed(rv)) return rv; do_queryinterface the previous code uses the special nscomptr function do_queryinterface that lets you queryinterface without having to worry about reference counting, error handling, and other overhead. the do_queryinterface knows what interface to qi to based on the nscomptr that is being assigned into. we could have just as easily have used the raw queryinterface() method, but using ns...
... to using createinstance from the nsicomponentmanager, but there is no aggregation parameter since the object has already been constructed. nscomptr<nsicategorymanager> catman; rv = servman->getservicebycontractid(ns_categorymanager_contractid, ns_get_iid(nsicategorymanager), getter_addrefs(catman)); if (ns_failed(rv)) return rv; there are two service getters on the nsiservicemanager interface: one that takes a cid and another interface that takes a contract id. here we'll use the latter. the first parameter to the getservicebycontractid is of course the contract id, which is defined in the nsxpcom.h header file. the next parameter is a nifty macro that returns the iid for the interface name that you pass in. the la...
...And 46 more matches

Expressions and operators - JavaScript
ht shift assignment x >>>= y x = x >>> y bitwise and assignment x &= y x = x & y bitwise xor assignment x ^= y x = x ^ y bitwise or assignment x |= y x = x | y logical and assignment x &&= y x && (x = y) logical or assignment x ||= y x || (x = y) logical nullish assignment x ??= y x ?? ...
... x &= y x = x & y bitwise xor assignment x ^= y x = x ^ y bitwise or assignment x |= y x = x | y logical and assignment x &&= y x && (x = y) logical or assignment x ||= y x || (x = y) logical nullish assignment x ??= y x ?? (x = y) return value and chaining like most expressions, assignments like x = y have a return value. it can be retrieved by e.g. assigning the expression or logging it: const z = (x = y); // or equivalently: const z = x = y; console.log(z); // log the return value of the assignment x = y. console.log(x = y); // or log the return value directly. the return value matches the expression to the right of the = sign in the “meaning” column of the table above. that means that (x = y) ret...
...etrieved by e.g. assigning the expression or logging it: const z = (x = y); // or equivalently: const z = x = y; console.log(z); // log the return value of the assignment x = y. console.log(x = y); // or log the return value directly. the return value matches the expression to the right of the = sign in the “meaning” column of the table above. that means that (x = y) returns y, (x += y) returns the resulting sum x + y, (x **= y) returns the resulting power x ** y, and so on. in the case of logical assignments, (x &&= y), (x ||= y), and (x ??= y), the return value is that of the logical operation without the assignment, so x && y, x || y, and x ?? y, respectively. note that the return values are always based on the operands’ values before the operation. when chaining these expressi...
...And 46 more matches

JavaScript Daemons Management - Archive of obsolete content
this framework is released under the gnu public license, version 3 or later. ...
...you could safely remove all or some of them, * depending on your needs. if you want to remove them and are using the daemon.safe subsystem you * shou...
...you could safely remove all or some of them, * depending on your needs. if you want to remove them and are using the daemon.safe subsystem you * should also remove the daemon.safe global object methods that require them. **/ daemon.construct = function (aargs...
...And 44 more matches

Shell global objects
fference between each versions. you can get the list of functions by help() function in js shell. variables scriptargs an array that contains arguments passed to js shell. scriptpath a string that is a path of script. console an object that has following property: log evaluate and print expressions to stdout. this function is an alias of the print() function. timesaccessed returns a number that indicates how many times this variable is accessed perfmeasurement see perfmeasurement.jsm. shell only functions functions always available version([number]) get or force a script compilation version number. options([option ...]) get or toggle javascript options. load(['foo.js' ...]) load files named by string arguments. filename is relative to the current working dire...
...and debug info linenumber starting line number for error messages and debug info columnnumber starting column number for error messages and debug info global global in which to execute the code newcontext if true, create and use a new cx (default: false) catchtermination if true, catch termination (failure without an exception value, as for slow scripts or out-of-memory) and return 'terminated' element if present with value v, convert v to an object o and mark the source as being attached to the dom element o. if the property is omitted or v is null, don't attribute the source to any dom element. elementattributename if present and not undefined, the name of property of element that holds this code. this is what debugger.source.prototype.elementattributename returns...
...ecode if true, and if the source is a cacheentryobject, the bytecode would be encoded and saved into the cache entry after the script execution. asserteqbytecode if true, and if both loadbytecode and savebytecode are true, then the loaded bytecode and the encoded bytecode are compared. and an assertion is raised if they differ. run('foo.js') run the file named by the first argument, returning the number of of milliseconds spent compiling and executing it. read('bar.js') reads the file named by the first argument, returning the content of the file as string. readline() read a single line from stdin. readlinebuf([ buf ]) emulate readline() on the specified string. the first call with a string argument sets the source buffer. subsequent calls without an argument then read ...
...And 44 more matches

Proxy Auto-Configuration (PAC) file - HTTP
but there is interest in changing this behavior to match https); in firefox, the preference is network.proxy.autoconfig_url.include_path. host the hostname extracted from the url. this is only for convenience; it is the same string as between :// and the first : or / after that. the port number is not included in this parameter. it can be extracted from the url when necessary. ...
...rence is network.proxy.autoconfig_url.include_path. host the hostname extracted from the url. this is only for convenience; it is the same string as between :// and the first : or / after that. the port number is not included in this parameter. it can be extracted from the url when necessary. description returns a string describing the configuration. the format of this string is defined in return value format below. ...
...onfig_url.include_path. host the hostname extracted from the url. this is only for convenience; it is the same string as between :// and the first : or / after that. the port number is not included in this parameter. it can be extracted from the url when necessary. description returns a string describing the configuration. the format of this string is defined in return value format below. ...
...And 42 more matches

Graceful asynchronous programming with Promises - Learn web development
rstanding of javascript fundamentals. objective: to understand promises and how to use them. what are promises? we looked at promises briefly in the first article of the course, but here we'll look at them in a lot more depth. essentially, a promise is an object that represents an intermediate state of an operation — in effect, a promise that a result of some kind will be returned at some point in the future. there is no guarantee of exactly when the operation will complete and the result will be returned, but there is a guarantee that when the result is available, or the promise fails, the code you provide will be executed in order to do something else with a successful result, or to gracefully handle a failure case. generally, you are less interested in the amount of ...
...s no guarantee of exactly when the operation will complete and the result will be returned, but there is a guarantee that when the result is available, or the promise fails, the code you provide will be executed in order to do something else with a successful result, or to gracefully handle a failure case. generally, you are less interested in the amount of time an async operation will take to return its result (unless of course, it takes far too long!), and more interested in being able to respond to it being returned, whenever that is. and of course, it's nice that it doesn't block the rest of the code execution. one of the most common engagements you'll have with promises is with web apis that return a promise. let's consider a hypothetical video chat application. the application has a wi...
...ice-only call, among other possible options), it can block until not only all of those decisions are made, but also the camera and microphone have been engaged. also, the user may not respond immediately to these permission requests. this can potentially take a long time. ...
...And 38 more matches

nsIDOMWindowUtils
an element may be restyled multiple times (for example, when an inline element contains blocks). this number also counts restyling of pseudo-elements and anonymous boxes. throws ns_error_not_available if the count can't be provided. focusedinputtype string the type of the currently-focused html <input> element, if one is focused. imageanimationmode unsigned short returns the image animation mode of the window. the attribute's value must be one of the animationmode values from imgicontainer. imeisopen boolean returns the ime open state. true if it's open, otherwise false. this attribute only works when imestatus is ime_status_enabled. read only. imestatus unsigned long returns the current ime status. values correspond to the ime_sta...
...read only. layermanagertype astring what type of layer manager the widget associated with this window is using. "basic" is unaccelerated; other types are accelerated. throws an error if there is no widget associated with this window. read only. ...
...r window. read only. paintingsuppressed boolean true if painting is currently suppressed for this window; otherwise false. read only. this is used on mobile, for example, to prevent attempts to render content until enough of the page has been loaded to avoid content bouncing around excessively as more content is loaded. screenpixelspercsspixel float returns the number of screen pixels per css pixel. read only. audiomuted boolean with this it's possible to mute all the mediaelements in this window. we have audiomuted and audiovolume to preserve the volume across mute/umute. audiovolume float range: greater or equal to 0. the real volume level is affected by the volume of all ancestor windows. constants ...
...And 37 more matches

Index - Archive of obsolete content
-on in firefox's add-on bar. 67 windows add-on sdk enumerate and examine open browser windows, open new windows, and listen for window events. 68 low-level apis no summary! 69 /loader create commonjs module loaders. 70 chrome the chrome module gives an add-on sdk add-on access to the components object, which in turn gives it access to a large set of privileged low-level firefox apis. 71 console/plain-text constructor for a console instance. 72 console/traceback functionality similar to python's traceback module. 73 content/content re-exports three objects from three other modules: loader, worker, and symbiont. 74 content/loader ...
...l editingsession->makewindoweditable(domwindow, editortype, pr_true). the first parameter is the nsidomwindow you just retrieved, the second is the editor type you want to create, and the third is whether you want the window editable immediately or when the document is done loading. ...
...error console can be opened from the tools menu or by ctrl-shift-j. 433 exception logging in javascript extensions, extensions:tools, guide, javascript, javascript:tools, tools, web development, web development:tools in versions of firefox prior to firefox 3, all javascript exceptions were always logged into the error console if they remained unhandled at the time execution returned back into c++ code. as a result, if, for example, c++ code called a javascript component, which threw an exception, that exception would be logged to the console before control was returned to the c++ caller. 434 existing content this is a list of existing mozilla.org documentation. it needs to be checked, prioritized, and migrated. 435 extension frequently aske...
...And 35 more matches

Parser API
/reflect.jsm", obj) built-in objects whether in spidermonkey shell or firefox (after importing), the global singleton object reflect currently contains just the parse method. properties of the reflect object the reflect object currently consists of a single method. reflect.parse(src[, options]) coerces src to a string and parses the result as a javascript program. by default, the parsing returns a program object (see below) representing the parsed abstract syntax tree (ast). additional options may be provided via the options object, which can include any of the following properties: loc boolean default: true when loc is true, the parser includes source location information in the returned ast nodes. source string default: null a descript...
... line number default: 1 the initial line number to use for source location information. builder builder default: null a builder object, which can be used to produce ast nodes in custom data formats. ...
...: expression; body: statement; } a with statement. interface switchstatement <: statement { type: "switchstatement"; discriminant: expression; cases: [ switchcase ]; lexical: boolean; } a switch statement. the lexical flag is metadata indicating whether the switch statement contains any unnested let declarations (and therefore introduces a new lexical scope). interface returnstatement <: statement { type: "returnstatement"; argument: expression | null; } a return statement. interface throwstatement <: statement { type: "throwstatement"; argument: expression; } a throw statement. interface trystatement <: statement { type: "trystatement"; block: blockstatement; handler: catchclause | null; guardedhandlers: [ catchclause ]; fina...
...And 35 more matches

Functions - JavaScript
to use a function, you must define it somewhere in the scope from which you wish to call it. ...
...nction declaration, or function statement) consists of the function keyword, followed by: the name of the function. a list of parameters to the function, enclosed in parentheses and separated by commas. the javascript statements that define the function, enclosed in curly brackets, {...}. ...
...ters to the function, enclosed in parentheses and separated by commas. the javascript statements that define the function, enclosed in curly brackets, {...}. for example, the following code defines a simple function named square: function square(number) { return number * number; } the function square takes one parameter, called number. the function consists of one statement that says to return the parameter of the function (that is, number) multiplied by itself. the statement return specifies the value returned by the function: return number * number; primitive parameters (such as a number) are passed to functions by value; the value is passed to the function, but if the function changes the value of the parameter, this change is not reflected globally or in the calling function. i...
...And 35 more matches

IAccessibleTable
er-licenses/ia2/accessibletable.idlnot scriptable this interface gives access to a two-dimensional table. 1.0 66 introduced gecko 1.9 inherits from: iunknown last changed in gecko 1.9 (firefox 3) typically all accessible objects that represent cells or cell-clusters of a table will be at the same time children of the table. in this case iaccessible2.indexinparent() will return the child index which then can be used when calling rowindex() and columnindex(). however, in some cases that kind of implementation will not be possible. when the table cells are not direct children of a table, the object representing the cell can define a "table-cell-index" object attribute identifying the 0 based table cell index. this object attribute is obtained by parsing the attribute stri...
...child index which then can be used when calling rowindex() and columnindex(). however, in some cases that kind of implementation will not be possible. when the table cells are not direct children of a table, the object representing the cell can define a "table-cell-index" object attribute identifying the 0 based table cell index. this object attribute is obtained by parsing the attribute string returned by iaccessible2.attributes(). the "table-cell-index" attribute can be used just like a child index of the typical case. ats should first test for the presence of the "table-cell-index" attribute and if it is not present then iaccessible2.indexinparent() can be used as in the typical case where cells are direct children of the table. the range of valid coordinates for this interface are implemen...
...ex" attribute and if it is not present then iaccessible2.indexinparent() can be used as in the typical case where cells are direct children of the table. the range of valid coordinates for this interface are implementation dependent. however, that range includes at least the intervals from the from the first row or column with the index 0 up to the last (but not including) used row or column as returned by nrows() and ncolumns(). method overview [propget] hresult accessibleat([in] long row, [in] long column, [out] iunknown accessible ); [propget] hresult caption([out] iunknown accessible ); [propget] hresult childindex([in] long rowindex, [in] long columnindex, [out] long cellindex ); [propget] hresult columndescription([in] long column, [out] bstr description ); [propget] hresult c...
...And 34 more matches

Document - Web APIs
(e.g. html, xml, svg, …), a larger api is available: html documents, served with the "text/html" content type, also implement the htmldocument interface, whereas xml and svg documents implement the xmldocument interface. constructor document() creates a new document object. properties this interface also inherits from the node and eventtarget interfaces. ...
... served with the "text/html" content type, also implement the htmldocument interface, whereas xml and svg documents implement the xmldocument interface. constructor document() creates a new document object. properties this interface also inherits from the node and eventtarget interfaces. document.anchorsread only returns a list of all of the anchors in the document. document.body returns the <body> or <frameset> node of the current document. ...
... and svg documents implement the xmldocument interface. constructor document() creates a new document object. properties this interface also inherits from the node and eventtarget interfaces. document.anchorsread only returns a list of all of the anchors in the document. document.body returns the <body> or <frameset> node of the current document. document.charactersetread only returns the character set being used by the document. document.compatmode read only indicates whether the document is rendered in quirks or strict mode. ...
...And 34 more matches

StringView - Archive of obsolete content
ript typed arrays provide a mechanism for accessing raw binary data much more efficiently. the stringview constructor is one level above typed arrays. ...
.../ stringview.loadutf8charcode = function (achars, nidx) { /* the iso 10646 view of utf-8 considers valid codepoints encoded by 1-6 bytes, * while the unicode view of utf-8 in 2003 has limited them to 1-4 bytes in order to * match utf-16's codepoints. in front of a 5/6-byte sequence stringview tries to * encode it in any case. ...
...pt! ...
...And 32 more matches

nsIXPConnect
void flagsystemfilenameprefix(in string afilenameprefix, in prbool awantnativewrappers); void garbagecollect(); [noscript,notxpcom] void getcaller(out jscontextptr ajscontext, out jsobjectptr aobject); jsval getcowforobject(in jscontextptr ajscontext, in jsobjectptr aparent, in jsobjectptr awrappedobj); native code only! obsol...
...iption native code only!createsandbox create a sandbox for evaluating code in isolation using evalinsandboxobject(). nsixpconnectjsobjectholder createsandbox( in jscontextptr cx, in nsiprincipal principal ); parameters cx a context to use when creating the sandbox object. principal the principal (or null to use the null principal) to use when evaluating code in this sandbox. ...
...ing description createstackframelocation() nsistackframe createstackframelocation( in pruint32 alanguage, in string afilename, in string afunctionname, in print32 alinenumber, in nsistackframe acaller ); parameters alanguage missing description afilename missing description afunctionname missing description alinenumber missing description acaller missing description return value missing description exceptions thrown missing exception missing description debugdump() void debugdump( in short depth ); parameters depth missing description exceptions thrown missing exception missing description debugdumpevalinjsstackframe() void debugdumpevalinjsstackframe( in pruint32 aframenumber, in string asourcetext ); parameters aframenumber mis...
...And 32 more matches

Places utilities for JavaScript
sy to use functions that can save you from reinventing the wheel and cluttering up your own classes/functions when you need it. global objects there are a few global objects and constants defined in utils.js. these are: qi_node qi_node(anode, aiid) runs a query interface on a bookmark node to expose the interface available to that type. if the interface isn't available to that node, null is returned. anode - the bookmark aiid - the return interface wanted. there are several predefined versions of this for common calls. these just take in the node, as the interface is already defined: asvisit(anode) asfullvisit(anode) ascontainer(anode) asquery(anode) annotations a few annotation names are defined here. load_in_sidebar_anno - this annotation is associated with bookmarks or...
...ore. uritypes containertypes leftpanequeries queries that appear in the library's left pane. leftpanefolderid a single folder shown in the library's left pane. allbookmarksfolderid the id of the "all bookmarks" folder shown in the library's left pane. placesflavors generic_view_drop_types methods createfixeduri nsiuri createfixeduri(string aspec) takes in a spec and returns a valid uri based on it using the nsiurifixup service. parameters aspec a url string that needs fixup return type returns a correct nsiuri. getformattedstring() string getformattedstring(string key, array string params) parameters key the string name to get from the string bundle params strings to substitute into the bundle at designated points see...
...ixup service. parameters aspec a url string that needs fixup return type returns a correct nsiuri. getformattedstring() string getformattedstring(string key, array string params) parameters key the string name to get from the string bundle params strings to substitute into the bundle at designated points see xul:stringbundle for more information. return type returns a string from the default places stringbundle. getstring() string getstring(string key) parameters key the name of the string to get. return type returns a string from the default places stringbundle. ...
...And 31 more matches

Space Manager Detailed Design - Archive of obsolete content
new(size_t asize); void operator delete(void* aptr, size_t asize); static void shutdown(); /* * get the frame that's associated with the space manager. this frame * created the space manager, and the world coordinate space is * relative to this frame. * * you can use queryinterface() on this frame to get any additional * interfaces. */ nsiframe* getframe() const { return mframe; } /** * translate the current origin by the specified (dx, dy). this * creates a new local coordinate space relative to the current * coordinate space. */ void translate(nscoord adx, nscoord ady) { mx += adx; my += ady; } /** * returns the current translation from local coordinate space to * world coordinate space. this represents the accumulated calls to * tr...
...l coordinate space relative to the current * coordinate space. */ void translate(nscoord adx, nscoord ady) { mx += adx; my += ady; } /** * returns the current translation from local coordinate space to * world coordinate space. this represents the accumulated calls to * translate(). */ void gettranslation(nscoord& ax, nscoord& ay) const { ax = mx; ay = my; } /** * returns the y-most of the bottommost band or 0 if there are no bands. ...
...anslate(nscoord adx, nscoord ady) { mx += adx; my += ady; } /** * returns the current translation from local coordinate space to * world coordinate space. this represents the accumulated calls to * translate(). */ void gettranslation(nscoord& ax, nscoord& ay) const { ax = mx; ay = my; } /** * returns the y-most of the bottommost band or 0 if there are no bands. * * @return pr_true if there are bands and pr_false if there are no bands */ prbool ymost(nscoord& aymost) const; /** * returns a band starting at the specified y-offset. the band data * indicates which parts of the band are available, and which parts * are unavailable * * the band data that is returned is in the coordinate space of the * local coordinate system. * * the loca...
...And 30 more matches

Enc Dec MAC Output Public Key as CSR
eader as intermediate output files.\n\n", ""); fprintf(stderr, "%-7s for decrypt, it takes .enc and .header\n", ""); fprintf(stderr, "%-7s as input files and produces as a final output file.\n\n", ""); exit(-1); } /* map option letter enumerated commad type */ static commandtype option2command(const char* c) { switch (*c) { case 'g': return gen_csr; case 'e': return encrypt; case 'd': return decrypt; default: return unknown; } } /* * wrap the symkey using public key */ secstatus wrapkey(pk11symkey* key, seckeypublickey *pubkey, secitem **wrappedkey) { secstatus rv; secitem *data = (secitem *)port_zalloc(sizeof(secitem)); if (!data) { pr_fprintf(pr_stderr, "error while allocating memory\n"); ...
...(pubkey); data->data = (unsigned char*)port_zalloc((data->len)*sizeof(unsigned int)); if (!data->data) { pr_fprintf(pr_stderr, "error while allocating memory\n"); rv = secfailure; goto cleanup; } rv = pk11_pubwrapsymkey(ckm_rsa_pkcs, pubkey, key, data); if (rv != secsuccess) { rv = secfailure; } else { *wrappedkey = data; return secsuccess; } cleanup: if (data) { secitem_freeitem(data, pr_true); } return rv; } /* * generate a symmetric key */ pk11symkey * generatesymkey(pk11slotinfo *slot, ck_mechanism_type mechanism, int keysize, secitem *keyid, secupwdata *pwdata) { secstatus rv; pk11symkey *key; /* generate the symmetric key */ key = pk11_tokenkeygen...
...ey(pk11slotinfo *slot, ck_mechanism_type mechanism, int keysize, secitem *keyid, secupwdata *pwdata) { secstatus rv; pk11symkey *key; /* generate the symmetric key */ key = pk11_tokenkeygen(slot, mechanism, null, keysize, keyid, pr_false, pwdata); if (!key) { pr_fprintf(pr_stderr, "symmetric key generation failed \n"); } return key; } /* * macinit */ secstatus macinit(pk11context *ctx) { secstatus rv = pk11_digestbegin(ctx); if (rv != secsuccess) { pr_fprintf(pr_stderr, "compute mac failed : pk11_digestbegin()\n"); } return rv; } /* * macupdate */ secstatus macupdate(pk11context *ctx, unsigned char *msg, unsigned int msglen) { secstatus rv = pk11_digestop(ctx, msg, msglen); ...
...And 30 more matches

Encrypt Decrypt_MAC_Using Token
nc and .header\n", ""); fprintf(stderr, "%-7s as input files and produces as a final output file.\n\n", ""); exit(-1); } /* * gather a cka_id. */ secstatus gathercka_id(pk11symkey* key, secitem* buf) { secstatus rv = pk11_readrawattribute(pk11_typesymkey, key, cka_id, buf); if (rv != secsuccess) { pr_fprintf(pr_stderr, "pk11_readrawattribute returned (%d)\n", rv); pr_fprintf(pr_stderr, "could not read symkey cka_id attribute\n"); return rv; } return rv; } /* * generate a symmetric key. */ pk11symkey * generatesymkey(pk11slotinfo *slot, ck_mechanism_type mechanism, int keysize, secitem *keyid, secupwdata *pwdata) { secstatus rv; pk11symkey *key; if (pk11_needlogin(slot)) { ...
...ck_mechanism_type mechanism, int keysize, secitem *keyid, secupwdata *pwdata) { secstatus rv; pk11symkey *key; if (pk11_needlogin(slot)) { rv = pk11_authenticate(slot, pr_true, pwdata); if (rv != secsuccess) { pr_fprintf(pr_stderr, "could not authenticate to token %s.\n", pk11_gettokenname(slot)); return null; } } /* generate the symmetric key. */ key = pk11_tokenkeygen(slot, mechanism, null, keysize, keyid, pr_true, pwdata); if (!key) { pr_fprintf(pr_stderr, "symmetric key generation failed \n"); } return key; } /* * macinit */ secstatus macinit(pk11context *ctx) { secstatus rv = pk11_digestbegin(ctx); if (rv != sec...
... */ secstatus macfinal(pk11context *ctx, unsigned char *mac, unsigned int *ma...
...And 30 more matches

Debugger.Object - Firefox Developer Tools
ort of exotic object (an opaque wrapper, for example). class a string naming the ecmascript [[class]] of the referent. callable true if the referent is a callable object (such as a function or a function proxy); false otherwise. name the name of the referent, if it is a named function. if the referent is an anonymous function, or not a function at all, this is undefined. this accessor returns whatever name appeared after the function keyword in the source code, regardless of whether the function is the result of instantiating a function declaration (which binds the function to its name in the enclosing scope) or evaluating a function expression (which binds the function to its name only within the function’s body). displayname the referent’s display name, if the referent is...
...name: h/i f(function () {}); // display name: h/< } var s = f(function () {}); // display name: s< parameternames if the referent is a debuggee function, the names of the its parameters, as an array of strings. if the referent is not a debuggee function, or not a function at all, this is undefined. if the referent is a host function for which parameter names are not available, return an array with one element per parameter, each of which is undefined. if the referent is a function proxy, return an empty array. if the referent uses destructuring parameters, then the array’s elements reflect the structure of the parameters. for example, if the referent is a function declared in this way: function f(a, [b, c], {d, e:f}) { ... } then this debugger.object instance’s pa...
...is a string which is the name of the template; undefined otherwise. errorlinenumber if the referent is an error object, this is the line number at which the referent was created; undefined otherwise. errorcolumnnumber if the referent is an error object, this is the column number at which the referent was created; undefined otherwise. isboundfunction if the referent is a debuggee function, returns true if the referent is a bound function; false otherwise. if the referent is not a debuggee function, or not a function at all, returns undefined instead. isarrowfunction if the referent is a debuggee function, returns true if the referent is an arrow function; false otherwise. if the referent is not a debuggee function, or not a function at all, returns undefined instead. isgeneratorfunctio...
...And 30 more matches

A re-introduction to JavaScript (JS tutorial) - JavaScript
er to an integer, just change the base: parseint('11', 2); // 3 similarly, you can parse floating point numbers using the built-in parsefloat() function. unlike its parseint() cousin, parsefloat() always uses base 10. ...
...however the "+" operator simply converts the string to nan if there is an invalid character contained within it. just try parsing the string "10.2abc" with each method by yourself in the console and you'll understand the differences better. strings strings in javascript are sequences of unicode characters. this should be welcome news to anyone who has had to ...
...tion is to use an array literal: var a = ['dog', 'cat', 'hen']; a.length; // 3 note that array.length isn't necessarily the number of items in the array. consider the following: var a = ['dog', 'cat', 'hen']; a[100] = 'fox'; a.length; // 101 remember — the length of the array is one more than the highest index. ...
...And 30 more matches

JSAPI Cookbook
(cx), that makes a best guess, and sometimes that is the best that can be done. but in a jsnative the correct way to do this is: /* jsapi */ bool mynative(jscontext *cx, unsigned argc, js::value *vp) { js::callargs args = js::callargsfromvp(argc, vp); jsobject *global = js_getglobalforobject(cx, &args.callee()); ... ...
...ed argc, js::value *vp) { js::callargs args = js::callargsfromvp(argc, vp); jsobject *global = js_getglobalforobject(cx, &args.callee()); ... } defining a function // javascript function justforfun() { return null; } /* jsapi */ bool justforfun(jscontext *cx, unsigned argc, js::value *vp) { js::callargs args = js::callargsfromvp(argc, vp); args.rval().setnull(); return true; } ... /* * add this to your jscontext setup code. * this makes your c function visible as a global function in javascript. */ if (!js_definefunction(cx, global, "justforfun", &justforfun, 0, 0)) return false; to define many jsapi functions at once, use js_definefunctions. creating an array // javascript var x = []; // or "x = array()", or "x = new array" /* jsapi */ js::root...
...de. * this makes your c function visible as a global function in javascript. */ if (!js_definefunction(cx, global, "justforfun", &justforfun, 0, 0)) return false; to define many jsapi functions at once, use js_definefunctions. ...
...And 29 more matches

IAccessibleText
/ia2/accessibletext.idlnot scriptable a structure containing a substring and the start and end offsets in the enclosing string. 1.0 66 introduced gecko 1.9 inherits from: iunknown last changed in gecko 1.9 (firefox 3) this enum defines values which specify a text() boundary type. ia2_text_boundary_sentence is optional. when a method doesn't implement this method it must return s_false. typically this feature would not be implemented by an application. however, if the application developer was not satisfied with how screen readers have handled the reading of sentences this boundary type could be implemented and screen readers could use the application's version of a sentence rather than the screen reader's. the rest of the boundary types must be supported. this enum is ...
...esult textbeforeoffset([in] long offset, [in] enum ia2textboundarytype boundarytype, [out] long startoffset, [out] long endoffset, [out] bstr text ); methods addselection() adds a text() selection(). hresult addselection( [in] long startoffset, [in] long endoffset ); parameters startoffset starting offset ( 0 based). endoffset offset of first character after new selection() (0 based). return value e_invalidarg if bad [in] passed. s_ok. attributes() returns text() attributes. [propget] hresult attributes( [in] long offset, [out] long startoffset, [out] long endoffset, [out] bstr textattributes ); parameters offset text() offset (0 based) startoffset the starting offset of the character range over which all text() attributes match those of offset. (0 based) endoffset the offs...
...tarting offset of the character range over which all text() attributes match those of offset. (0 based) endoffset the offset of the first character past the character range over which all text() attributes match those of offset. (0 based) textattributes a string of attributes describing the text(). the attributes are described in the; text attributes specification on the iaccessible2 web site. return value e_invalidarg if bad [in] passed, [out] values are 0s and null respectively. s_false if there is nothing to return, [out] values are 0s and null respectively. s_ok. caretoffset() returns the position of the caret. returns the 0-based offset of the caret within the text(). if the text() is implemented as a tree of text() objects with embed characters in higher levels representing substrings o...
...And 29 more matches

Modularization techniques - Archive of obsolete content
e counting. interface interrogation is a simple, uniform mechanism for determining which interfaces a object supports, and for hiding the the mechanics of how the object was implemented. interface interrogation is performed using the queryinterface() method. the caller passes in an id and a pointer to a address to place the resulting interface. if the query is successful, queryinterface() will return ns_ok. if the object does not support the given interface, it will return ns_nointerface. reference counting is performed using the addref() and release() methods. an objects reference count generally starts at zero. addref() increments that reference count, and release() decrements it. if a call to release() causes the reference count to hit zero, the object will generally free itself. a succes...
..._nointerface. reference counting is performed using the addref() and release() methods. an objects reference count generally starts at zero. addref() increments that reference count, and release() decrements it. if a call to release() causes the reference count to hit zero, the object will generally free itself. a successful queryinterface() will call addref() on the requested interface before returning. both addref() and release() return the resulting reference count. the convenience macros ns_addref() and ns_release() are preferred over calling addref and release directly. in debug builds, these macros provide useful reference counting logs. use them wherever possible. /* * the nsisupports interface */ class nsisupports { public: ns_imethod queryinterface(const nsiid &aiid, ...
...sisupports is defined as ns_isupports_iid. queryinterface() has several important characteristics that must be maintained. if you perform a queryinterface() on interface a and obtain interface b, you must be able to perform a queryinterface() b and obtain interface a. if interfaces a and b are both implemented by the same instance, performing a queryinterface() for nsisupports on either should return the exact same interface. this means that even though interface b inherits from nsisupports, performing a queryinterface() on it may not return the same interface. this important behavior is the only reliable mechanism for determining whether interfaces a and b are implemented by the same object.for simple objects, maintaining these behaviors is easy. aggregation, as we will see later, can compli...
...And 28 more matches

Debugger - Firefox Developer Tools
that spidermonkey calls when a call to a debug event handler, breakpoint handler, or similar function throws some exception, which we refer to asdebugger-exception here. exceptions thrown in the debugger are not propagated to debuggee code; instead, spidermonkey calls this function, passingdebugger-exception as its sole argument and the debugger instance as the this value. this function should return a resumption value, which determines how the debuggee should continue. if the uncaught exception hook itself throws an exception,uncaught-hook-exception, spidermonkey throws a new error object,confess-to-debuggee-exception, to the debuggee whose message blames the debugger, and includes textual descriptions ofuncaught-hook-exception and the originaldebugger-exception. if uncaughtexceptionhook...
...ou can store handler functions for spidermonkey to call when given events occur in debuggee code. when one of the events described below occurs in debuggee code, the engine pauses the debuggee and calls the corresponding debugging handler on each debugger instance that is observing the debuggee. the handler functions receive the debugger instance as their this value. most handler functions can return a resumption value indicating how the debuggee’s execution should proceed. on a new debugger instance, each of these properties is initially undefined. any value assigned to a debugging handler must be either a function or undefined; otherwise a typeerror is thrown. handler functions run in the same thread in which the event occurred. they run in the compartment to which they belong, not in a...
...gging handler must be either a function or undefined; otherwise a typeerror is thrown. handler functions run in the same thread in which the event occurred. they run in the compartment to which they belong, not in a debuggee compartment. onnewscript(script,global) new code, represented by the debugger.script instancescript, has been loaded in the scope of the debuggees. ...
...And 28 more matches

HTMLInputElement - Web APIs
ke="#d4dde4" stroke-width="2px" /><text x="411" y="94" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">htmlinputelement</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties properties related to the parent form form read only htmlformelement object: returns a reference to the parent <form> element. formaction string: returns / sets the element's formaction attribute, containing the uri of a program that processes information submitted by the element. this overrides the action attribute of the parent form. formenctype string: returns / sets the element's formenctype attribute, containing the type of content that is used to su...
...ibute, containing the uri of a program that processes information submitted by the element. this overrides the action attribute of the parent form. formenctype string: returns / sets the element's formenctype attribute, containing the type of content that is used to submit the form to the server. this overrides the enctype attribute of the parent form. formmethod string: returns / sets the element's formmethod attribute, containing the http method that the browser uses to submit the form. this overrides the method attribute of the parent form. formnovalidate boolean: returns / sets the element's formnovalidate attribute, indicating that the form is not to be validated when it is submitted. this overrides the novalidate attribute of the parent form. ...
...ormmethod attribute, containing the http method that the browser uses to submit the form. this overrides the method attribute of the parent form. formnovalidate boolean: returns / sets the element's formnovalidate attribute, indicating that the form is not to be validated when it is submitted. this overrides the novalidate attribute of the parent form. formtarget string: returns / sets the element's formtarget attribute, containing a name or keyword indicating where to display the response that is received after submitting the form. this overrides the target attribute of the parent form. ...
...And 28 more matches

Window - Web APIs
xt></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} constructors see also the dom interfaces. domparser domparser can parse xml or html source stored in a string into a dom document. domparser is specified in dom parsing and serialization. image used for creating an htmlimageelement. option used for creating an htmloptionelement. staticrange read only returns a staticrange() constructor which creates a staticrange object. worker used for creating a web worker. xmlserializer converts a dom tree into xml or html source. properties this interface inherits properties from the eventtarget interface and implements properties from the windoworworkerglobalscope and windoweventhandlers mixins. note that properties which are objects (e.g.,. for overrid...
...operties from the eventtarget interface and implements properties from the windoworworkerglobalscope and windoweventhandlers mixins. note that properties which are objects (e.g.,. for overriding the prototype of built-in elements) are listed in a separate section below. window.closed read only this property indicates whether the current window is closed or not. ...
...note that properties which are objects (e.g.,. for overriding the prototype of built-in elements) are listed in a separate section below. window.closed read only this property indicates whether the current window is closed or not. window.console read only returns a reference to the console object which provides access to the browser's debugging console. window.controllers read only returns the xul controller objects for the current chrome window. ...
...And 28 more matches

Promise.prototype.then() - JavaScript
the then() method returns a promise. it takes up to two arguments: callback functions for the success and failure cases of the promise. the source for this interactive demo is stored in a github repository. if you'd like to contribute to the interactive demo project, please clone https://github.com/mdn/interactive-examples and send us a pull request. if one or both arguments are omitted or are provided non-functions, then then will be missing the handler(s), but will not generate any errors. if the promise that then is called on adopts a state (fulfillment or rejection) for which then has no handler, the returned promise simply adopts the final state of the original promise on which then was called. syntax p.then(onfulfilled[, onrejected]); p.then(value => { // fulfillment }, reaso...
...nal state of the original promise on which then was called. syntax p.then(onfulfilled[, onrejected]); p.then(value => { // fulfillment }, reason => { // rejection }); parameters onfulfilled optional a function called if the promise is fulfilled. this function has one argument, the fulfillment value. ...
...ne argument, the fulfillment value. if it is not a function, it is internally replaced with an "identity" function (it returns the received argument). onrejected optional a function called if the promise is rejected. this function has one argument, the rejection reason. if it is not a function, it is internally replaced with a "thrower" function (it throws an error it received as argument). return value once a promise is fulfilled or rejected, the respective handler function (onfulfilled or onrejected) will be called asynchronously (scheduled in the current thread loop). the behavior of the handler function follows a specific set of rules. ...
...And 28 more matches

this - JavaScript
object using the global globalthis property, regardless of the current context in which your code is running. function context inside a function, the value of this depends on how the function is called. since the following code is not in strict mode, and because the value of this is not set by the call, this will default to the global object, which is window in a browser. ...
... this will default to the global object, which is window in a browser. function f1() { return this; } // in a browser: f1() === window; // true // in node: f1() === globalthis; // true in strict mode, however, if the value of this is not set when entering an execution context, it remains as undefined, as shown in the following example: function f2() { 'use strict'; // see strict mode return this; } f2() === undefined; // true in the second example, this should be undefined, because f2 was called directly and not as a method or property of an object (e.g. window.f2()). this feature wasn't implemented in some browsers when they first started to support strict mode. as a result, they incorrectly returned the window object. to set the value of this to a particular value when calling...
...elf. derived classes unlike base class constructors, derived constructors have no initial this binding. calling super() creates a this binding within the constructor and essentially has the effect of evaluating the following line of code, where base is the inherited class: this = new base(); warning: referring to this before calling super() will throw an error. ...
...And 28 more matches

Migrate apps from Internet Explorer to Mozilla - Archive of obsolete content
ng them out into their own functions. not only does this make the code easier to read, it simplifies adding support for new clients: var elm = getelmbyid("myid"); function getelmbyid(aid){ var element = null; if (ismozilla || isie5) element = document.getelementbyid(aid); else if (isnetscape4) element = document.layers[aid]; else if (isie4) element = document.all[aid]; return element; } the above code still has the issue of browser sniffing, or detecting which browser the user is using. browser sniffing is usually done through the useragent, such as: mozilla/5.0 (x11; u; linux i686; en-us; rv:1.5) gecko/20031016 while using the useragent to sniff the browser provides detailed information on the browser in use, code that handles useragents often can make mistakes ...
...c version of a specific browser. for all other purposes you should check for the feature you need rather than the browsers you think will support that feature. javascript also allows inline conditional statements, which can help with code readability: var foo = (condition) ? conditionistrue : conditionisfalse; for example, to retrieve an element, you would use: function getelement(aid){ return (document.getelementbyid) ? document.getelementbyid(aid) : document.all[aid]); } differences between mozilla and internet explorer first, i'll discuss the differences in the way html behaves between mozilla and internet explorer. tooltips legacy browsers introduced tooltips into html by showing them on links and using the value of the alt attribute as a too...
...pe 4 document.layers method and internet explorer's document.all. while document.getelementbyid lets you retrieve one element, you can also use document.layers and document.all to obtain a list of all document elements with a certain tag name, such as all <div> elements. the w3c dom level 1 method gets references to all elements with the same tag name through getelementsbytagname(). the method returns an array in javascript, and can be called on the document element or other nodes to search only their subtree. to get an array of all elements in the dom tree, you can use getelementsbytagname("*"). the dom level 1 methods, as shown in table 1, are commonly used to move an element to a certain position and toggle its visibility (menus, animations). netscape 4 used the <layer> tag, which mozilla...
...And 27 more matches

nsINavBookmarksService
ach call to beginupdatebatch. if you do not do this, certain parts of the ui will not get updated and any changes to bookmarks will not get written to disk. from c++ code inside the places component, use nsbookmarksupdatebatcher defined in nsnavbookmarks.h to scope batches. for js or from other components, just please be very careful to close the batch, especially when encountering an error and returning early. void beginupdatebatch(); parameters none. changebookmarkuri() this method changes the bookmarked uri for a bookmark. it changes which "place" the bookmark points at, which means all annotations, and so on are carried along. void changebookmarkuri( in nsiuri olduri, obsolete since gecko 1.9 in long long aitemid, in nsiuri anewuri ); parameters olduri obsolete since geck...
...ng long createdynamiccontainer( in long long aparentfolder, in autf8string aname, in astring acontractid, in long aindex ); parameters aparentfolder the id of the parent folder. aname the name of the new folder. acontractid the contract id of the service which is to manipulate this container. aindex the index to insert at, or default_index to append to the end of the list. return value returns the id of the newly-inserted folder. createfolder() this method creates a new child folder and inserts it under the given parent. long long createfolder( in long long aparentfolder, in autf8string name, in long index ); parameters aparentfolder the id of the parent folder. name the name of the new folder. index the index to insert at, or default_index to append t...
...he newly-inserted folder. createfolder() this method creates a new child folder and inserts it under the given parent. long long createfolder( in long long aparentfolder, in autf8string name, in long index ); parameters aparentfolder the id of the parent folder. name the name of the new folder. index the index to insert at, or default_index to append to the end of the list. return value returns the id of the newly-inserted folder. endupdatebatch() obsolete since gecko 1.9 (firefox 3) causes observers to be notified of an endupdatebatch when a batch is done changing. should match beginupdatebatch() or bad things will happen. void endupdatebatch(); parameters none. exportbookmarkshtml() obsolete since gecko 1.9 (firefox 3) ...
...And 27 more matches

DevTools API - Firefox Developer Tools
. parameters: target {target} - the target the toolbox will debug. toolid {string} - the tool that should be activated. if unspecified the previously active tool is shown. hosttype {string} - the position the toolbox will be placed. one of bottom, side, window, custom. see hosttype for details. hostoptions {object} - an options object passed to the selected host. see hosttype for details. return value: a promise that is fulfilled with the toolbox instance once it has been initialized and the selected tool is loaded. gettoolbox(target) fetch the toolbox object for the given target. parameters: target {target} - the target the toolbox is debugging. return value: toolbox object or undefined if there's no toolbox for the given target.. closetoolbox(target) closes the too...
...tool is loaded. gettoolbox(target) fetch the toolbox object for the given target. parameters: target {target} - the target the toolbox is debugging. return value: toolbox object or undefined if there's no toolbox for the given target.. closetoolbox(target) closes the toolbox for given target. parameters: target {target} - the target of the toolbox that should be closed. return value: a promise that is fulfilled once the toolbox has been destroyed. getdefaulttools() returns an array of tooldefinition objects for the built-in tools. getadditionaltools() returns an array of tooldefinition objects for tools added by addons. gettooldefinition(toolid) fetch the tooldefinition object for a tool if it exists and is enabled. parameters: toolid {string} - ...
... is fulfilled once the toolbox has been destroyed. getdefaulttools() returns an array of tooldefinition objects for the built-in tools. getadditionaltools() returns an array of tooldefinition objects for tools added by addons. gettooldefinition(toolid) fetch the tooldefinition object for a tool if it exists and is enabled. parameters: toolid {string} - the id of the tool. return value: a tooldefinition if a tool with the given id exists and is enabled, null otherwise. gettooldefinitionmap() returns a toolid → tooldefinition map for tools that are enabled. gettooldefinitionarray() returns an array of tooldefinition objects for enabled tools sorted by the order they appear in the toolbox. getthemedefinition(themeid) fetch the themedefinition object for...
...And 27 more matches

Box-shadow generator - CSS: Cascading Style Sheets
.appendchild(unit); input.addeventlistener('click', function(e) { this.select(); }); input.addeventlistener('change', function(e) { setvalue(topic, e.target.value | 0); }); subscribe(topic, function(value) { node.children[0].value = value; }); } var increment = function increment(topic) { var slider = sliders[topic]; if (slider === null || slider === undefined) return; if (slider.value + slider.step <= slider.max) { slider.value += slider.step; setvalue(slider.topic, slider.value) notify.call(slider); } }; var decrement = function decrement(topic) { var slider = sliders[topic]; if (slider === null || slider === undefined) return; if (slider.value - slider.step >= slider.min) { slider.value -= slider.step; setvalue(topic, slider...
...f (precision > this.step / 2) value = value + this.step; if (this.snap) pos = (value - this.min) * width / delta; this.pointer.style.left = pos - offset/2 + "px"; this.value = value; node.setattribute('data-value', value); notify.call(this); } var setvalue = function setvalue(topic, value) { var slider = sliders[topic]; if (value > slider.max || value < slider.min) return; var delta = slider.max - slider.min; var width = slider.node.clientwidth; var offset = slider.pointer.clientwidth; var pos = (value - slider.min) * width / delta; slider.value = value; slider.pointer.style.left = pos - offset / 2 + "px"; slider.node.setattribute('data-value', value); notify.call(slider); } var setmousetracking = function setmousetracking(elem, callback) { ...
... }); } var subscribe = function subscribe(topic, callback) { if (subscribers[topic] === undefined) subscribers[topic] = []; subscribers[topic].push(callback); } var unsubscribe = function unsubscribe(topic, callback) { subscribers[topic].indexof(callback); subscribers[topic].splice(index, 1); } var notify = function notify() { if (subscribers[this.topic] === undefined) return; for (var i in subscribers[this.topic]) { subscribers[this.topic][i](this.value); } } var init = function init() { var elem, size; elem = document.queryselectorall('.ui-slider-btn-set'); size = elem.length; for (var i = 0; i < size; i++) setbuttoncomponent(elem[i]); elem = document.queryselectorall('.ui-slider-input'); size = elem.length; for (var i = 0; i < size; i+...
...And 27 more matches

JSAPI User Guide
igned int) report->lineno, message); } int run(jscontext *cx) { // enter a request before running anything in the context. jsautorequest ar(cx); // create the global object and a new compartment. ...
...al(cx); global = js_newglobalobject(cx, &globalclass, nullptr, js::dontfireonnewglobalhook); if (!global) return 1; // enter the new global object's compartment. jsautocompartment ac(cx, global); // populate the global object with the standard globals, like object and // array. if (!js_initstandardclasses(cx, global)) return 1; // your application code here. this may include jsapi calls to create your // own custom js objects and run scripts. return 0; } int main(int argc, const char *argv[]) { // initialize the js engine. if (!js_init()) return 1; // create a js runtime. jsruntime *rt = js_newruntime(8l * 1024l * 1024l); if (!rt) return 1; // create a context. ...
...ls to create your // own custom js objects and run scripts. return 0; } int main(int argc, const char *argv[]) { // initialize the js engine. if (!js_init()) return 1; // create a js runtime. jsruntime *rt = js_newruntime(8l * 1024l * 1024l); if (!rt) return 1; // create a context. jscontext *cx = js_newcontext(rt, 8192); if (!cx) return 1; js_seterrorreporter(rt, reporterror); int status = run(cx); // shut everything down. js_destroycontext(cx); js_destroyruntime(rt); js_shutdown(); return status; } each jsnative has the same signature, regardless of what arguments it expects to receive from javascript. the javascript arguments to the function are given in argc and vp. argc tells how many actual...
...And 26 more matches

core/promise - Archive of obsolete content
implementation of promises to make asynchronous programming easier. rationale most of the js apis are asynchronous complementing its non-blocking nature. while this has a good reason and many advantages, it comes with a price. ...
...to continuation passing style, involving lots of machinery: function sphagetti(a, b, callback) { assemble(a, function continuewith(error, c) { if (error) callback(error); else combine(b, c, callback); }); } this style also makes doing things in sequence hard: widget.on('click', function onclick() { promptuserfortwitterhandle(function continuewith(error, handle) { if (error) return ui.displayerror(error); twitter.gettweetsfor(handle, funtion continuewith(error, tweets) { if (error) return ui.displayerror(error); ui.showtweets(tweets); }); }); }); doing things in parallel is even harder: var tweets, answers, checkins; twitter.gettweetsfor(user, function continuewith(result) { tweets = result; somethingfinished(); }); stackoverflow.getanswersfor(q...
...ult; somethingfinished(); }); foursquare.getcheckinsby(user, function continuewith(result) { checkins=result; somethingfinished(); }); var finished = 0; function somethingfinished() { if (++finished === 3) ui.show(tweets, answers, checkins); } this also makes error handling quite an adventure. promises consider another approach, instead of continuation via callbacks, a function returns an object that represents a eventual result, either successful or failed. this object is a promise, both figuratively and by name, to eventually resolve. we can call a function on the promise to observe either its fulfillment or rejection. if the promise is rejected and the rejection is not explicitly observed, any derived promises will be implicitly rejected for the same reason. in the add-on ...
...And 25 more matches

Bytecode Descriptions
typeof, typeofexpr stack: val ⇒ (typeof val) the typeof operator. infallible. the result is always a string that depends on the type of val. jsop::typeof and jsop::typeofexpr are the same except that--amazingly--jsop::typeof affects the behavior of an immediately preceding jsop::getname or jsop::getgname instruction! this is how we implement typeof step 2, making typeof nonexistingvariable return "undefined" instead of throwing a referenceerror. in a global scope: typeof x compiles to getgname "x"; typeof. typeof (0, x) compiles to getgname "x"; typeofexpr. emitting the same bytecode for these two expressions would be a bug. per spec, the latter throws a referenceerror if x doesn't exist. format: jof_ic pos stack: val ⇒ (+val) the unary + operator. +val doesn't do any actual math. ...
...n executing with iter on the stack, starting with the next instruction (always jsop::loophead). code must not jump into or out of this region: control can enter only by executing jsop::iter and can exit only by executing a jsop::enditer or by exception unwinding. (a jsop::enditer is always emitted at the end of the loop, and extra copies are emitted on "exit slides", where a break, continue, or return statement exits the loop.) typically a single try note entry marks the contiguous chunk of bytecode from the instruction after jsop::iter to jsop::enditer (inclusive); but if that range contains any instructions on exit slides, after a jsop::enditer, then those must be correctly noted as outside the loop. format: jof_ic moreiter stack: iter ⇒ iter, name get the next property name for a for-i...
... iteration checkisobj operands: (checkisobjectkind kind) stack: result ⇒ result check that the top value on the stack is an object, and throw a typeerror if not. kind is used only to generate an appropriate error message. implements: getiterator step 5, iteratornext step 3. both operations call a js method which scripts can define however they want, so they check afterwards that the method returned an object. checkobjcoercible stack: val ⇒ val throw a typeerror if val is null or undefined. implements: requireobjectcoercible. but most instructions that require an object will perform this check for us, so of the dozens of calls to requireobjectcoercible in the spec, we need this instruction only for destructuring assignment and initialization. toasynciter stack: iter, next ⇒ async...
...And 25 more matches

tabbrowser - Archive of obsolete content
iewer type: nsimarkupdocumentviewer this read-only property contains the nsimarkupdocumentviewer which is responsible for drawing the document. securityui type: nsisecurebrowserui the read-only property holds an object which may be used to determine the security level of the loaded document. selectedbrowser type: browser element this read-only property returns the currently displayed browser element. selectedtab type: tab element a reference to the currently selected tab, which will always be one of the tab elements in the tabs element. assign a value to this property to modify the currently selected tab. sessionhistory type: nsishistory this read-only property contains the nsishistory object which holds the session histor...
... selectedtab type: tab element a reference to the currently selected tab, which will always be one of the tab elements in the tabs element. assign a value to this property to modify the currently selected tab. sessionhistory type: nsishistory this read-only property contains the nsishistory object which holds the session history. tabcontainer type: tabs element returns the tabs element that contains the tabs. this is useful for add-ons that need to use events related to tabs in the browser window. tabs type: array a nodelist containing the tab objects for each tab in the tabbrowser. this is a shortcut for looking at the tabs in the tabcontainer. visibletabs type: array an array containing tab objects for each visible tab in the tabbrowser. this lets you ...
...faultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata addprogresslistener( listener ) return type: no return value add a progress listener to the browser which will monitor loaded documents. the progress listener should implement the nsiwebprogresslistener interface. addtab( url, referreruri, charset, postdata, owner, allowthirdpartyfixup ) addtab( url, {referreruri: ..., charset: ..., postdata: ..., owner: ..., allowthirdpartyfixup: ..., relatedtocurrent: ... }) return type: ...
...And 24 more matches

Encrypt Decrypt MAC Keys As Session Objects
enc and .header\n", ""); fprintf(stderr, "%-7s as input files and produces as a final output file.\n\n", ""); exit(-1); } /* * gather a cka_id */ secstatus gathercka_id(pk11symkey* key, secitem* buf) { secstatus rv = pk11_readrawattribute(pk11_typesymkey, key, cka_id, buf); if (rv != secsuccess) { pr_fprintf(pr_stderr, "pk11_readrawattribute returned (%d)\n", rv); pr_fprintf(pr_stderr, "could not read symkey cka_id attribute\n"); return rv; } return rv; } /* * generate a symmetric key */ pk11symkey * generatesymkey(pk11slotinfo *slot, ck_mechanism_type mechanism, int keysize, secitem *keyid, secupwdata *pwdata) { secstatus rv; pk11symkey *key; if (pk11_needlogin(slot)) { ...
...ck_mechanism_type mechanism, int keysize, secitem *keyid, secupwdata *pwdata) { secstatus rv; pk11symkey *key; if (pk11_needlogin(slot)) { rv = pk11_authenticate(slot, pr_true, pwdata); if (rv != secsuccess) { pr_fprintf(pr_stderr, "could not authenticate to token %s.\n", pk11_gettokenname(slot)); return null; } } /* generate the symmetric key */ key = pk11_tokenkeygen(slot, mechanism, null, keysize, keyid, pr_true, pwdata); if (!key) { pr_fprintf(pr_stderr, "symmetric key generation failed \n"); } return key; } /* * macinit */ secstatus macinit(pk11context *ctx) { secstatus rv = pk11_digestbegin(ctx); if (rv != secs...
...anism, null, keysize, keyid, pr_true, pwdata); if (!key) { pr_fprintf(pr_stderr, "symmetric key generation failed \n"); } return key; } /* * macinit */ secstatus macinit(pk11context *ctx) { secstatus rv = pk11_digestbegin(ctx); if (rv != secsuccess) { pr_fprintf(pr_stderr, "compute mac failed : pk11_digestbegin()\n"); } return rv; } /* * macupdate */ secstatus macupdate(pk11context *ctx, unsigned char *msg, unsigned int msglen) { secstatus rv = pk11_digestop(ctx, msg, msglen); if (rv != secsuccess) { pr_fprintf(pr_stderr, "compute mac failed : digestop()\n"); } return rv; } /* * finalize macing */ secstatus macfinal(pk11context *ctx, unsigned char *mac, unsigned int *mac...
...And 24 more matches

Encrypt and decrypt MAC using token
enc and .header\n", ""); fprintf(stderr, "%-7s as input files and produces as a final output file.\n\n", ""); exit(-1); } /* * gather a cka_id */ secstatus gathercka_id(pk11symkey* key, secitem* buf) { secstatus rv = pk11_readrawattribute(pk11_typesymkey, key, cka_id, buf); if (rv != secsuccess) { pr_fprintf(pr_stderr, "pk11_readrawattribute returned (%d)\n", rv); pr_fprintf(pr_stderr, "could not read symkey cka_id attribute\n"); return rv; } return rv; } /* * generate a symmetric key */ pk11symkey * generatesymkey(pk11slotinfo *slot, ck_mechanism_type mechanism, int keysize, secitem *keyid, secupwdata *pwdata) { secstatus rv; pk11symkey *key; if (pk11_needlogin(slot)) { ...
...ck_mechanism_type mechanism, int keysize, secitem *keyid, secupwdata *pwdata) { secstatus rv; pk11symkey *key; if (pk11_needlogin(slot)) { rv = pk11_authenticate(slot, pr_true, pwdata); if (rv != secsuccess) { pr_fprintf(pr_stderr, "could not authenticate to token %s.\n", pk11_gettokenname(slot)); return null; } } /* generate the symmetric key */ key = pk11_tokenkeygen(slot, mechanism, null, keysize, keyid, pr_true, pwdata); if (!key) { pr_fprintf(pr_stderr, "symmetric key generation failed \n"); } return key; } /* * macinit */ secstatus macinit(pk11context *ctx) { secstatus rv = pk11_digestbegin(ctx); if (rv != secs...
...anism, null, keysize, keyid, pr_true, pwdata); if (!key) { pr_fprintf(pr_stderr, "symmetric key generation failed \n"); } return key; } /* * macinit */ secstatus macinit(pk11context *ctx) { secstatus rv = pk11_digestbegin(ctx); if (rv != secsuccess) { pr_fprintf(pr_stderr, "compute mac failed : pk11_digestbegin()\n"); } return rv; } /* * macupdate */ secstatus macupdate(pk11context *ctx, unsigned char *msg, unsigned int msglen) { secstatus rv = pk11_digestop(ctx, msg, msglen); if (rv != secsuccess) { pr_fprintf(pr_stderr, "compute mac failed : digestop()\n"); } return rv; } /* * finalize macing */ secstatus macfinal(pk11context *ctx, unsigned char *mac, unsigned int *mac...
...And 24 more matches

NSS Sample Code Sample_3_Basic Encryption and MACing
r headers */ #include <prthread.h> #include <plgetopt.h> #include <prerror.h> #include <prinit.h> #include <prlog.h> #include <prtypes.h> #include <plstr.h> /* * gather a cka_id */ secstatus gathercka_id(pk11symkey* key, secitem* buf) { secstatus rv = pk11_readrawattribute(pk11_typesymkey, key, cka_id, buf); if (rv != secsuccess) { pr_fprintf(pr_stderr, "pk11_readrawattribute returned (%d)\n", rv); pr_fprintf(pr_stderr, "could not read symkey cka_id attribute\n"); return rv; } return rv; } /* * generate a symmetric key */ pk11symkey * generatesymkey(pk11slotinfo *slot, ck_mechanism_type mechanism, int keysize, secitem *keyid, secupwdata *pwdata) { secstatus rv; pk11symkey *key; if (pk11_needlogin(slot)) { ...
...ck_mechanism_type mechanism, int keysize, secitem *keyid, secupwdata *pwdata) { secstatus rv; pk11symkey *key; if (pk11_needlogin(slot)) { rv = pk11_authenticate(slot, pr_true, pwdata); if (rv != secsuccess) { pr_fprintf(pr_stderr, "could not authenticate to token %s.\n", pk11_gettokenname(slot)); return null; } } /* generate the symmetric key */ key = pk11_tokenkeygen(slot, mechanism, null, keysize, keyid, pr_true, pwdata); if (!key) { pr_fprintf(pr_stderr, "symmetric key generation failed \n"); } return key; } /* * macinit */ secstatus macinit(pk11context *ctx) { secstatus rv = pk11_digestbegin(ctx); if (rv != secs...
...anism, null, keysize, keyid, pr_true, pwdata); if (!key) { pr_fprintf(pr_stderr, "symmetric key generation failed \n"); } return key; } /* * macinit */ secstatus macinit(pk11context *ctx) { secstatus rv = pk11_digestbegin(ctx); if (rv != secsuccess) { pr_fprintf(pr_stderr, "compute mac failed : pk11_digestbegin()\n"); } return rv; } /* * macupdate */ secstatus macupdate(pk11context *ctx, unsigned char *msg, unsigned int msglen) { secstatus rv = pk11_digestop(ctx, msg, msglen); if (rv != secsuccess) { pr_fprintf(pr_stderr, "compute mac failed : digestop()\n"); } return rv; } /* * finalize macing */ secstatus macfinal(pk11context *ctx, unsigned char *mac, unsigned int *mac...
...And 24 more matches

lang/functional - Archive of obsolete content
functional helper methods. usage the lang/functional module provides functional helper methods. some of these functions implement apis from jeremy ashkenas's underscore.js and all credits go to him and his contributors. globals functions method(lambda) takes a function and returns a method associated with an object. when the method is invoked on an instance of the object, the original function is called. it is passed the object instance (i.e. ...
...od associated with an object. when the method is invoked on an instance of the object, the original function is called. it is passed the object instance (i.e. this) as the first parameter, followed by any parameters passed into the method. let { method } = require("sdk/lang/functional"); let mynumber = { times: method(times), add: method(add), number: 0 }; function times (target, x) { return target.number *= x; } function add (target, x) { return target.number += x; } console.log(mynumber.number); // 0 mynumber.add(10); // 10 mynumber.times(2); // 20 mynumber.add(3); // 23 parameters lambda : function the function to be wrapped and returned. returns function : the wrapped lambda. defer(fn) takes a function and returns a wrapped version of the function. calling the wrapped v...
...lang/functional"); let fn = defer(function myevent (event, value) { console.log(event + " : " + value); }); fn("click", "#home"); console.log("done"); // this will print 'done' before 'click : #home' since // we deferred the execution of the wrapped `myevent` // function, making it non-blocking and executing on the // next event loop parameters fn : function the function to be deferred. ...
...And 23 more matches

Install script template - Archive of obsolete content
o"; var plugin_description = "my exemplary plugin mine all mine"; // registry constant paths // these will be used when the win32 registry keys are written var hkey_local_machine = "hkey_local_machine"; var hkey_current_user = "hkey_current_user"; var reg_moz_path = "software\\mozillaplugins"; // my own error code in case secondary installation fails var nosecondaryinstall = 1; // error return codes need some memory var err; // error return codes when we try and install to the current browser var errblock1; // error return codes when we try and do a secondary installation var errblock2 = 0; // global variable containing our secondary install location var secondaryfolder; //special error values used by the cycore developers (www.cycore.com) who helped make this install script va...
...ing current browser install due to lack of space..."); cancellinstall(); } // secondary install block, which sets up plugins and xpt in another location in addition to the current browser errblock2 = createsecondaryinstall(); // performinstall block, in which error conditions from previous blocks are checked. ...
...n failed, * you still have a chance to install the plugin for the already * installed gecko browsers. ...
...And 23 more matches

IPDL Tutorial
(mpluginlibrary); } private: prlibrary* mpluginlibrary; }; launching the subprocess and hooking these protocol actors into our ipc "transport layer" is beyond the scope of this document. see ipdl processes and threads for more details. because protocol messages are represented as c++ methods, it's easy to forget that they are in fact asynchronous messages: by default the c++ method will return immediately, before the message has been delivered. the parameters of the recv* methods (const nscstring& pluginpath in the example) are references to temporary objects, so copy them if you need to keep their data around. direction each message type includes a "direction." the message direction specifies whether the message can be sent from-parent-to-child, from-child-to-parent, or both ways.
...ply assign a valid value to it, as follows: avariant = false; structs ipdl has built-in support for arbitrary collections of serializable data types. struct namevaluepair { nscstring name; nscstring value; }; in implementation code, these structs can be created and used like so: namevaluepair entry(astring, anotherstring); foo(entry.name(), entry.value()); // named accessor functions return references to the members arrays ipdl has simple syntax for arrays: invokemethod(nscstring[] args); in c++ this is translated into a nstarray reference: virtual bool recvinvokemethod(nstarray<nscstring>& args); ipdl's generated data structures can be used in several protocols if they are defined in a separate .ipdlh file. these files must be added to the ipdl.mk makefile like regular ...
... a separate .ipdlh file. these files must be added to the ipdl.mk makefile like regular .ipdl files, and they use the same syntax (except they cannot declare protocols). to use the structures defined in foo.ipdlh, include it as follows. // in a .ipdl file include foo; synchronous and rpc messaging up until now, all the messages have been asynchronous. the message is sent, and the c++ method returns immediately. but what if we wanted to wait until the message was handled, or get return values from a message? in ipdl, there are three different semantics: asynchronous semantics; the sender is not blocked. wait until the receiver acknowledges that it received the message. we call this synchronous semantics, as the sender blocks until the receiver receives the message and sends back a repl...
...And 23 more matches

EncDecMAC using token object - sample 3
n", ""); fprintf(stderr, "%-7s for decrypt, it takes .enc and .header\n", ""); fprintf(stderr, "%-7s as input files and produces as a final output file.\n\n", ""); exit(-1); } /* * gather a cka_id */ secstatus gathercka_id(pk11symkey* key, secitem* buf) { secstatus rv = pk11_readrawattribute(pk11_typesymkey, key, cka_id, buf); if (rv != secsuccess) { pr_fprintf(pr_stderr, "pk11_readrawattribute returned (%d)\n", rv); pr_fprintf(pr_stderr, "could not read symkey cka_id attribute\n"); return rv; } return rv; } /* * generate a symmetric key */ pk11symkey * generatesymkey(pk11slotinfo *slot, ck_mechanism_type mechanism, int keysize, secitem *keyid, secupwdata *pwdata) { secstatus rv; pk11symkey *key; if (pk11_needlogin(slot)) { rv = pk11_authenticate(slot, pr_true, pwdata); if (rv != secsuccess) {...
...v; } return rv; } /* * generate a symmetric key */ pk11symkey * generatesymkey(pk11slotinfo *slot, ck_mechanism_type mechanism, int keysize, secitem *keyid, secupwdata *pwdata) { secstatus rv; pk11symkey *key; if (pk11_needlogin(slot)) { rv = pk11_authenticate(slot, pr_true, pwdata); if (rv != secsuccess) { pr_fprintf(pr_stderr, "could not authenticate to token %s.\n", pk11_gettokenname(slot)); return null; } } /* generate the symmetric key */ key = pk11_tokenkeygen(slot, mechanism, null, keysize, keyid, pr_true, pwdata); if (!key) { pr_fprintf(pr_stderr, "symmetric key generation failed \n"); } return key; } /* * macinit */ secstatus macinit(pk11context *ctx) { secstatus rv = pk11_digestbegin(ctx); if (rv != secsuccess) { pr_fprintf(pr_stderr, "compute mac failed : pk11_digestbegin()\n"); } r...
...null; } } /* generate the symmetric key */ key = pk11_tokenkeygen(slot, mechanism, null, keysize, keyid, pr_true, pwdata); if (!key) { pr_fprintf(pr_stderr, "symmetric key generation failed \n"); } return key; } /* * macinit */ secstatus macinit(pk11context *ctx) { secstatus rv = pk11_digestbegin(ctx); if (rv != secsuccess) { pr_fprintf(pr_stderr, "compute mac failed : pk11_digestbegin()\n"); } return rv; } /* * macupdate */ secstatus macupdate(pk11context *ctx, unsigned char *msg, unsigned int msglen) { secstatus rv = pk11_digestop(ctx, msg, msglen); if (rv != secsuccess) { pr_fprintf(pr_stderr, "compute mac failed : digestop()\n"); } return rv; } /* * finalize macing */ secstatus macfinal(pk11context *ctx, unsigned char *mac, unsigned int *maclen, unsigned int maxlen) { secstatus rv = pk11_d...
...And 23 more matches

Creating the Component Code
tually happening. in this case, the long-hand implementation gives us an opportunity to talk about various features of xpcom. what we'll be working on the component we'll be working on in this book controls a special mode in your browser that prevents users from leaving the current domain or a set of safe domains. once enabled, this "weblock" mode is password protected and persists until it is turned off by the password holder. it can be used to implement parental controlled browsing for children, or for targeted "kiosk browsing," where the content is restricted to a particular server. web lock user interface shows the icon that is used to activate the web lock mode (leftmost in the status bar) once you have installed the weblock component and the extra user interface. web lock user interf...
... of acceptable domains. in a way, the factory and module layers are glue to plug the xpcom object into the larger xpcom system. one layer above the object itself is the nsifactory object. this object provides basic abstraction of the xpcom object itself. as you can see in onion peel view of xpcom component creation, the main accessor for the xpcom object is createinstance, which is expected to return the object that matches a given cid and iid pair. moving another layer outward is the nsimodule. this interface provides yet another abstraction of the nsifactory object, and may allow for multiple nsifactory objects. the key to this interface is that the return type of getclassobject does not have to be an nsifactory. instead, the nsimodule can ask for implementation details about the xpcom obj...
...ual relationships between the client and component interfaces. the variable kifactoryiid, for example, provides methods like equals() that can be used to facilitate comparisons in the code, as in the following example from the mozilla source: using class methods to handle identifiers if (aiid.equals(ns_get_iid(nsisupports))) { *ainstanceptr = (void*)(nsisupports*)this; ns_addref_this(); return ns_ok; } finally, sample_cid is an example of a cid that uniquely identifies the component. all of the 128-bit numbers used in xpcom - the class and the interface ids - are examples of uuids, or universal unique identifiers, which were discussed in object interface discovery. generating cids to generate a cid for your component, you can use the uuidgen tool that comes with most unix distribu...
...And 23 more matches

Border-image generator - CSS: Cascading Style Sheets
createelement('input'); input.setattribute('type', 'text'); input.style.width = 50 + obj.precision * 10 + 'px'; input.addeventlistener('click', function(e) { this.select(); }); input.addeventlistener('change', function(e) { var value = parsefloat(e.target.value); if (isnan(value) === true) setvalue(obj.topic, obj.value); else setvalue(obj.topic, value); }); return input; }; var slidercomponent = function slidercomponent(obj, sign) { var slider = document.createelement('div'); var startx = null; var start_value = 0; slider.addeventlistener("click", function(e) { document.removeeventlistener("mousemove", slidermotion); setvalue(obj.topic, obj.value + obj.step * sign); }); slider.addeventlistener("mousedown", function(e) { startx = e...
...nd = function slideend(e) { document.removeeventlistener("mousemove", slidermotion); document.body.style.cursor = "auto"; slider.style.cursor = "pointer"; }; var slidermotion = function slidermotion(e) { slider.style.cursor = "e-resize"; var delta = (e.clientx - startx) / obj.sensivity | 0; var value = delta * obj.step + start_value; setvalue(obj.topic, value); }; return slider; }; var inputslider = function(node) { var min = parsefloat(node.getattribute('data-min')); var max = parsefloat(node.getattribute('data-max')); var step = parsefloat(node.getattribute('data-step')); var value = parsefloat(node.getattribute('data-value')); var topic = node.getattribute('data-topic'); var unit = node.getattribute('data-unit'); var name = node.getattribut...
...appendchild(input); node.appendchild(slider_right); this.input = input; sliders[topic] = this; setvalue(topic, value); }; inputslider.prototype.setinputvalue = function setinputvalue() { this.input.value = this.value.tofixed(this.precision) + this.unit; }; var setvalue = function setvalue(topic, value, send_notify) { var slider = sliders[topic]; if (slider === undefined) return; value = parsefloat(value.tofixed(slider.precision)); if (value > slider.max) value = slider.max; if (value < slider.min) value = slider.min; slider.value = value; slider.node.setattribute('data-value', value); slider.setinputvalue(); if (send_notify === false) return; notify.call(slider); }; var setmax = function setmax(topic, value) { var slider = sliders[topic]; ...
...And 23 more matches

Introduction to using XPath in JavaScript - XPath
avascript internally, in extensions, and from websites. mozilla implements a fair amount of the dom 3 xpath, which means that xpath expressions can be run against both html and xml documents. the main interface to using xpath is the evaluate function of the document object. document.evaluate this method evaluates xpath expressions against an xml based document (including html documents), and returns a xpathresult object, which can be a single node or a set of nodes. the existing documentation for this method is located at document.evaluate, but it is rather sparse for our needs at the moment; a more comprehensive examination will be given below. var xpathresult = document.evaluate( xpathexpression, contextnode, namespaceresolver, resulttype, result ); parameters the evaluate function ta...
...a total of five parameters: xpathexpression: a string containing the xpath expression to be evaluated. contextnode: a node in the document against which the xpathexpression should be evaluated, including any and all of its child nodes. the document node is the most commonly used. namespaceresolver: a function that will be passed any namespace prefixes contained within xpathexpression which returns a string representing the namespace uri associated with that prefix. this enables conversion between the prefixes used in the xpath expressions and the possibly different prefixes used in the document. the function can be either: created by using the creatensresolver method of a xpathevaluator object. you should use this virtually all of the time. null, which can be used for html docume...
...used for html documents or when no namespace prefixes are used. note that, if the xpathexpression contains a namespace prefix, this will result in a domexception being thrown with the code namespace_err. a custom user-defined function. see the using a user defined namespace resolver section in the appendix for details. ...
...And 23 more matches

Editor Embedding Guide - Archive of obsolete content
l editingsession->makewindoweditable(domwindow, editortype, pr_true). the first parameter is the nsidomwindow you just retrieved, the second is the editor type you want to create, and the third is whether you want the window editable immediately or when the document is done loading. ...
...rtlinknoui cmd_insertimagenoui cmd_inserthr cmd_charset sets the charset for the document. getcommandstate "state_attribute" (cstring) docommand "state_attribute" (cstring) note there must be a clear undo stack or this will not work. cmd_copy copies current selection. getcommandstate "state_enabled" (boolean) docommand no parameter note getcommandstate in these cases will return whether or not it is possible to call docommand. this will not really give you any concrete information on the state of the command. cmd_cut cuts current selection. getcommandstate "state_enabled" (boolean) docommand no parameter note getcommandstate in these cases will return whether or not it is possible to call docommand. this will not really give you any concrete information on the...
...ndstate "state_enabled" (boolean) docommand no parameter note getcommandstate in these cases will return whether or not it is possible to call docommand. this will not really give you any concrete information on the state of the command. cmd_delete deletes current selection. getcommandstate "state_enabled" (boolean) docommand no parameter note getcommandstate in these cases will return whether or not it is possible to call docommand. this will not really give you any concrete information on the state of the command. cmd_paste pastes into current selection or if there is no selection at the cursor position. getcommandstate "state_enabled" (boolean) docommand no parameter note getcommandstate in these cases will return whether or not it is possible to call docommand. t...
...And 22 more matches

Enc Dec MAC Using Key Wrap CertReq PKCS10 CSR
progname, dbdir, headerfilename, encryptedfilename); validationfailed = pr_true; } if (validationfailed) { fprintf(stderr, "\nusage: %s %s \n\n", progname, "-d -d <dbdirpath> -b <headerfilename> -e <encryptfilename> -o <opfilename>\n"); exit(-1); } } /* * sign the contents of input file using private key and * return result as secitem */ secstatus signdata(const char *infilename, seckeyprivatekey *pk, secitem *res) { secstatus rv = secfailure; unsigned int nb; unsigned char ibuf[4096]; prfiledesc *infile = null; sgncontext *sgn = null; /* open the input file for reading */ infile = pr_open(infilename, pr_rdonly, 0); if (!infile) { ...
...ss) { pr_fprintf(pr_stderr, "problem while sgn_update\n"); goto cleanup; } } rv = sgn_end(sgn, res); if (rv != secsuccess) { pr_fprintf(pr_stderr, "problem while sgn_end\n"); goto cleanup; } cleanup: if (infile) { pr_close(infile); } if (sgn) { sgn_destroycontext(sgn, pr_true); } return rv; } /* * verify the signature using public key */ secstatus verifydata(const char *infilename, seckeypublickey *pk, secitem *sigitem, secupwdata *pwdata) { unsigned int nb; unsigned char ibuf[4096]; secstatus rv = secfailure; vfycontext *vfy = null; prfiledesc *infile = null; /* open the input file for reading */ infile = ...
...success) { pr_fprintf(pr_stderr, "problem while vfy_update\n"); goto cleanup; } } rv = vfy_end(vfy); if (rv != secsuccess) { pr_fprintf(pr_stderr, "problem while vfy_end\n"); goto cleanup; } cleanup: if (infile) { pr_close(infile); } if (vfy) { vfy_destroycontext(vfy, pr_true); } return rv; } /* * write cryptographic parameters to header file */ secstatus writetoheaderfile(const char *buf, unsigned int len, headertype type, prfiledesc *outfile) { secstatus rv; const char *header; const char *trailer; switch (type) { case symkey: header = enckey_header; trailer = enckey_trailer; break; ...
...And 22 more matches

sample2
* missing publically from nss versions earlier than 3.13 */ #ifndef sec_error_base #define sec_error_base (-0x2000) typedef enum { sec_error_io = sec_error_base + 0, sec_error_token_not_logged_in = (sec_error_base + 155), sec_error_end_of_list } secerrorcodes; #endif /* port_errortostring introduced in nss 3.13. on earlier versions of nss that * don't support error tables, pr_errortostring will return "unknown code". */ #ifndef port_errortostring #define port_errortostring(err) pr_errortostring((err), pr_language_i_default) #endif /* sample 6 commands */ typedef enum { generate_csr, add_cert_to_db, save_cert_to_header, encrypt, decrypt, sign, verify, unknown } commandtype; typedef enum { symkey = 0, mackey = 1, iv = 2, mac = 3, pad = 4, pubkey = 5, lab = 6, certenc= 7, certvfy= 8, sig = 9 } he...
...pr_fprintf(pr_stderr, "%s -d -d %s -b %s -e %s -o : output file name is not found\n", progname, dbdir, headerfilename, encryptedfilename); validationfailed = pr_true; } if (validationfailed) { fprintf(stderr, "\nusage: %s %s \n\n", progname, "-d -d <dbdirpath> -b <headerfilename> -e <encryptfilename> -o <opfilename>\n"); exit(-1); } } /* * sign the contents of input file using private key and * return result as secitem */ secstatus signdata(const char *infilename, seckeyprivatekey *pk, secitem *res) { secstatus rv = secfailure; unsigned int nb; unsigned char ibuf[4096]; prfiledesc *infile = null; sgncontext *sgn = null; /* open the input file for reading */ infile = pr_open(infilename, pr_rdonly, 0); if (!infile) { pr_fprintf(pr_stderr, "unable to open \"%s\" for reading.\n", infilename); rv =...
...leanup; } while ((nb = pr_read(infile, ibuf, sizeof(ibuf))) > 0) { rv = sgn_update(sgn, ibuf, nb); if (rv != secsuccess) { pr_fprintf(pr_stderr, "problem while sgn_update\n"); goto cleanup; } } rv = sgn_end(sgn, res); if (rv != secsuccess) { pr_fprintf(pr_stderr, "problem while sgn_end\n"); goto cleanup; } cleanup: if (infile) { pr_close(infile); } if (sgn) { sgn_destroycontext(sgn, pr_true); } return rv; } /* * verify the signature using public key */ secstatus verifydata(const char *infilename, seckeypublickey *pk, secitem *sigitem, secupwdata *pwdata) { unsigned int nb; unsigned char ibuf[4096]; secstatus rv = secfailure; vfycontext *vfy = null; prfiledesc *infile = null; /* open the input file for reading */ infile = pr_open(infilename, pr_rdonly, 0); if (!infile) { pr_fprintf(pr_stderr, "...
...And 22 more matches

IAccessibleTable2
opget] hresult selectedcolumns([out, size_is(, ncolumns)] long selectedcolumns, [out] long ncolumns ); [propget] hresult selectedrows([out, size_is(, nrows)] long selectedrows, [out] long nrows ); hresult selectrow([in] long row ); [propget] hresult summary([out] iunknown accessible ); hresult unselectcolumn([in] long column ); hresult unselectrow([in] long row ); methods caption() returns the caption for the table. the returned object could be an iaccessible or an iaccessible2. [propget] hresult caption( [out] iunknown accessible ); parameters accessible if the table has a caption then a reference to it is returned, else a null pointer is returned. return value s_false if there is nothing to return, [out] value is null. s_ok. cellat() returns the accessible object at the spe...
...d row and column in the table. this object could be an iaccessible or an iaccessible2. [propget] hresult cellat( [in] long row, [in] long column, [out] iunknown cell ); parameters row the 0 based row index for which to retrieve the cell. column the 0 based column index for which to retrieve the cell. cell if both row and column index are valid then the corresponding accessible object is returned that represents the requested cell regardless of whether the cell is currently visible (on the screen). return value e_invalidarg if bad [in] passed, [out] value is null. s_ok. columndescription() returns the description text of the specified column in the table. [propget] hresult columndescription( [in] long column, [out] bstr description ); parameters column the 0 based index of the co...
...r the cell is currently visible (on the screen). return value e_invalidarg if bad [in] passed, [out] value is null. s_ok. columndescription() returns the description text of the specified column in the table. [propget] hresult columndescription( [in] long column, [out] bstr description ); parameters column the 0 based index of the column for which to retrieve the description. description returns the description text of the specified column in the table if such a description exists. otherwise a null pointer is returned. return value e_invalidarg if bad [in] passed, [out] value is null. s_false if there is nothing to return, [out] value is null. s_ok. iscolumnselected() returns a boolean value indicating whether the specified column is completely selected. [propget] hresult iscolumnselec...
...And 22 more matches

nsIAnnotationService
ry annotations, for which getpageannotationbinary() or getitemannotationbinary() should be used. c++ consumers may use the type-specific methods. the type-specific methods throw if the given annotation is set in a different type. nsivariant getpageannotation( in nsiuri auri, in autf8string aname ); parameters auri the uri on which the annotation is set. aname the annotation name. return value returns a page annotation. getitemannotation() this method retrieves the value of a given item annotation. throws an error if the annotation does not exist. throws for binary annotations, for which getpageannotationbinary() or getitemannotationbinary() should be used. c++ consumers may use the type-specific methods. the type-specific methods throw if the given annotation is set in a diff...
...ions, for which getpageannotationbinary() or getitemannotationbinary() should be used. c++ consumers may use the type-specific methods. the type-specific methods throw if the given annotation is set in a different type. nsivariant getitemannotation( in long long aitemid, in autf8string aname ); parameters aitemid the item on which the annotation is set. aname the annotation name. return value returns an item annotation. getpageannotationstring() this method retrieves the value of a given uri annotation in string format. throws an error if the annotation does not exist. throws for binary annotations, for which getpageannotationbinary() or getitemannotationbinary() should be used. c++ consumers may use the type-specific methods. the type-specific methods throw if the given anno...
...annotations, for which getpageannotationbinary() or getitemannotationbinary() should be used. c++ consumers may use the type-specific methods. the type-specific methods throw if the given annotation is set in a different type. astring getpageannotationstring( in nsiuri auri, in autf8string aname ); parameters auri the uri on which the annotation is set. aname the annotation name. return value returns a string value page annotation. getitemannotationstring() this method retrieves the value of a given item annotation in string format. throws an error if the annotation does not exist. throws for binary annotations, for which getpageannotationbinary() or getitemannotationbinary() should be used. c++ consumers may use the type-specific methods. the type-specific methods throw if t...
...And 22 more matches

Old Proxy API - Archive of obsolete content
proxy objects, controlled by a handler object. there are two kinds of proxies: object proxies var proxy = proxy.create(handler, proto); and function proxies : var proxy = proxy.createfunction(handler, calltrap, constructtrap); where: proto is an optional object representing the proxy’s prototype (defaults to null if none is provided). calltrap is a variable-argument function(args) { return any; } that reifies “proxy(args)”. note: the this-binding of the calltrap function is the this-binding of the call-site. constructtrap is an optional variable-argument function(args) { return any-object; } that reifies “new proxy(args)”. the this-binding of the constructtrap is either undefined (in strict mode) or the global object (in non-strict mode). if no constructtrap is provided, p...
...the derived trap is undefined, a default implementation using the fundamental traps is used. in other words: fundamental traps are required, derived traps are optional. fundamental traps emulated javascript code handler method description object.getownpropertydescriptor(proxy, name) getownpropertydescriptor: function(name) -> propertydescriptor | undefined should return a valid property descriptor object, or undefined to indicate that no property with name exists in the emulated object. object.getpropertydescriptor(proxy, name) getpropertydescriptor: function(name) -> propertydescriptor | undefined this function doesn't exist in ecmascript 5. like getownpropertydescriptor, but should also search the prototype chain. object.getownpropertyn...
... property with name exists in the emulated object. object.getpropertydescriptor(proxy, name) getpropertydescriptor: function(name) -> propertydescriptor | undefined this function doesn't exist in ecmascript 5. like getownpropertydescriptor, but should also search the prototype chain. object.getownpropertynames(proxy) getownpropertynames: function() -> strings array return an array of all own (non-inherited) property names of the emulated object. object.getpropertynames(proxy) getpropertynames: function() -> strings array this function doesn't exist in ecmascript 5. like getownpropertynames, but should also return non-overridden inherited properties. object.defineproperty(proxy,name,pd) defineproperty: function(name, propertydescriptor) -...
...And 21 more matches

source-editor.jsm
call removeeventlistener(). void addeventlistener( string aeventtype, function acallback ); parameters aeventtype the name of the event type to listen for; see event name constants for possible values. acallback the function to call when the specified event occurs. canredo() determines whether or not there are changes that can be redone. boolean canredo(); parameters none. return value true if there are changes that can be redone, otherwise false. canundo() determines whether or not there are changes that can be undone. boolean canundo(); parameters none. return value true if there are changes that can be undone, otherwise false. destroy() destroys the editor, releasing resource it's allocated and removing event handlers it's installed. you should call this met...
...() finds a string in the editor's text. number find( [optional] string astring [optional] object aoptions ); parameters astring optional the string for which to search. if not specified, the currently selected text in the editor is used as the search string. aoptions optional an optional object containing properties customizing the search operation. see find options for details. return value returns an integer indicating the offset into the text at which the first character of the found string is located, or -1 if the string wasn't found. find options the aoptions object can customize the search operation. it may have the following properties: property type description backwards boolean if true, the search begins at start (or the end of the tex...
...finds the next occurrence of the search operation started by the last call to find(). note: this ignores the value you specified for backwards in the original search; it always searches forward. number findnext( boolean awrap }; parameters awrap if true, the search operation will wrap around to the beginning of the text. otherwise, the search stops if the end of the text is reached. return value the offset into the text at which the next occurrence of the string begins, or -1 if the string isn't found. findprevious() finds the previous occurrence of the search operation started by the last call to find(). note: this ignores the value you specified for backwards in the original search; it always searches backward. number findnext( boolean awrap }; parameters awrap if tr...
...And 21 more matches

Debugger.Object - Firefox Developer Tools
t instance), or null if it has no prototype. class a string naming the ecmascript [[class]] of the referent. callable true if the referent is a callable object (such as a function or a function proxy); false otherwise. name the name of the referent, if it is a named function. if the referent is an anonymous function, or not a function at all, this is undefined. this accessor returns whatever name appeared after the function keyword in the source code, regardless of whether the function is the result of instantiating a function declaration (which binds the function to its name in the enclosing scope) or evaluating a function expression (which binds the function to its name only within the function's body). displayname the referent's display name, if the referent is a f...
...ame: h/i f(function () {}); // display name: h/< } var s = f(function () {}); // display name: s< parameternames if the referent is a debuggee function, the names of the its parameters, as an array of strings. if the referent is not a debuggee function, or not a function at all, this is undefined. if the referent is a host function for which parameter names are not available, return an array with one element per parameter, each of which is undefined. if the referent is a function proxy, return an empty array. if the referent uses destructuring parameters, then the array's elements reflect the structure of the parameters. for example, if the referent is a function declared in this way: function f(a, [b, c], {d, e:f}) { ... } then this debugger.object instance's parame...
...s: if the referent is a wrapper, the result refers to the wrapper's global, not the wrapped object's global. the result refers to the global directly, not via a wrapper. hostannotations a javascript object providing further metadata about the referent, or null if none is available. the metadata object is in the same compartment as this debugger.object instance. the same metadata object is returned each time for a given debugger.object instance. a typical javascript embedding provides "host objects" to expose application-specific functionality to scripts. the hostannotations accessor consults the embedding for additional information about the referent that might be of interest to the debugger. the returned object's properties' meanings are up to the embedding. for example, a web browser...
...And 21 more matches

WebGL constants - Web APIs
all constants are of type glenum. standard webgl constants are installed on the webglrenderingcontext and webgl2renderingcontext objects, so that you use them as gl.constant_name: var canvas = document.getelementbyid('mycanvas'); var gl = canvas.getcontext('webgl'); gl.getparameter(gl.line_width); some constants are also provided by webgl extensions. a list is provided below. var debuginfo = gl.getextension('webgl_debug_renderer_info'); var vendor = gl.getparameter(debuginfo.unmasked_vendor_webgl); the webgl tutorial has more information, examples, and resources on how to get started with webgl. ...
...roup of triangles. each vertex connects to the previous and the first vertex in the fan. blending modes constants passed to webglrenderingcontext.blendfunc() or webglrenderingcontext.blendfuncseparate() to specify the blending mode (for both, rbg and alpha, or separately). constant name value description zero 0 passed to blendfunc or blendfuncseparate to turn off a component. one 1 passed to blendfunc or blendfuncseparate to turn on a component. src_color 0x0300 passed to blendfunc or blendfuncseparate to multiply a component by the source elements color. one_minus_src_color 0x0301 passed to blendfunc or blendfuncseparate to multiply a component by one minus the source elements color. src_alpha ...
... blendequation or blendequationseparate to specify a subtraction blend function (source - destination). func_reverse_subtract 0x800b passed to blendequation or blendequationseparate to specify a reverse subtraction blend function (destination - source). getting gl parameter information constants passed to webglrenderingcontext.getparameter() to specify what information to return. constant name value description blend_equation 0x8009 passed to getparameter to get the current rgb blend function. blend_equation_rgb 0x8009 passed to getparameter to get the current rgb blend function. same as blend_equation blend_equation_alpha 0x883d passed to getparameter to get the current alpha blend function. same as blend_...
...And 21 more matches

Element - Web APIs
e53" text-anchor="middle" alignment-baseline="middle">element</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties inherits properties from its parent interface, node, and by extension that interface's parent, eventtarget. it implements the properties of parentnode, childnode, nondocumenttypechildnode, and animatable. ...
...ts: all;} properties inherits properties from its parent interface, node, and by extension that interface's parent, eventtarget. it implements the properties of parentnode, childnode, nondocumenttypechildnode, and animatable. element.attributes read only returns a namednodemap object containing the assigned attributes of the corresponding html element. element.classlist read only returns a domtokenlist containing the list of class attributes. element.classname is a domstring representing the class of the element. ...
...ntnode, childnode, nondocumenttypechildnode, and animatable. element.attributes read only returns a namednodemap object containing the assigned attributes of the corresponding html element. element.classlist read only returns a domtokenlist containing the list of class attributes. element.classname is a domstring representing the class of the element. element.clientheight read only returns a number representing the inner height of the element. element.clientleft read only returns a number representing the width of the left border of the element. element.clienttop read only returns a number representing the width of the top border of the element. element.clientwidth read only returns a number representing the inner width of the element. element.computedname read only re...
...And 20 more matches

Node - Web APIs
in addition, every kind of dom node is represented by an interface based on node. these include attr, characterdata (which text, comment, and cdatasection are all based on), processinginstruction, documenttype, notation, entity, and entityreference. in some cases, a particular feature of the base node interface may not apply to one of its child interfaces; in that case, the inheriting node may return null or throw an exception, depending on circumstances. for example, attempting to add children to a node type that cannot have children will throw an exception. <div id="interfacediagram" style="display: inline-block; position: relative; width: 100%; padding-bottom: 11.666666666666666%; vertical-align: middle; overflow: hidden;"><svg style="display: inline-block; position: absolute; top: 0;...
...troke-width="2px" /><text x="188.5" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">node</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties in addition to the properties below, node inherits properties from its parent, eventtarget. node.baseuriread only returns a domstring representing the base url of the document containing the node. node.baseuriobject read only (not available to web content.) the nsiuri object representing the base uri for the element. node.childnodesread only returns a live nodelist containing all the children of this node. nodelist being live means that if the children of the node change, the nodelist object is automaticall...
...f the document containing the node. node.baseuriobject read only (not available to web content.) the nsiuri object representing the base uri for the element. node.childnodesread only returns a live nodelist containing all the children of this node. nodelist being live means that if the children of the node change, the nodelist object is automatically updated. node.firstchildread only returns a node representing the first direct child node of the node, or null if the node has no child. ...
...And 20 more matches

RTCPeerConnection - Web APIs
="170" height="50" fill="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="236" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">rtcpeerconnection</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} constructorrtcpeerconnection() the rtcpeerconnection() constructor returns a newly-created rtcpeerconnection, which represents a connection between the local device and a remote peer.propertiesalso inherits properties from: eventtargetcantrickleicecandidatesthe read-only rtcpeerconnection property cantrickleicecandidates returns a boolean which indicates whether or not the remote peer can accept trickled ice candidates.connectionstate the read-only connectionstate pro...
... remote peer.propertiesalso inherits properties from: eventtargetcantrickleicecandidatesthe read-only rtcpeerconnection property cantrickleicecandidates returns a boolean which indicates whether or not the remote peer can accept trickled ice candidates.connectionstate the read-only connectionstate property of the rtcpeerconnection interface indicates the current state of the peer connection by returning one of the string values specified by the enum rtcpeerconnectionstate.currentlocaldescription read only the read-only property rtcpeerconnection.currentlocaldescription returns an rtcsessiondescription object describing the local end of the connection as it was most recently successfully negotiated since the last time the rtcpeerconnection finished negotiating and connecting to a remote peer.
...essfully negotiated since the last time the rtcpeerconnection finished negotiating and connecting to a remote peer. also included is a list of any ice candidates that may already have been generated by the ice agent since the offer or answer represented by the description was first instantiated.currentremotedescription read only the read-only property rtcpeerconnection.currentremotedescription returns an rtcsessiondescription object describing the remote end of the connection as it was most recently successfully negotiated since the last time the rtcpeerconnection finished negotiating and connecting to a remote peer. also included is a list of any ice candidates that may already have been generated by the ice agent since the offer or answer represented by the description was first instantiate...
...And 20 more matches

Indexed collections - JavaScript
items, either of the following can be used: // this... let arr = new array(arraylength) // ...results in the same array as this let arr = array(arraylength) // this has exactly the same effect let arr = [] arr.length = arraylength note: in the above code, arraylength must be a number. otherwise, an array with a single element (the provided value) will be created. calling arr.length will return arraylength, but the array doesn't contain any elements. a for...in loop will not find any property on the array. in addition to a newly defined variable as shown above, arrays can also be assigned as a property of a new or an existing object: let obj = {} // ... obj.prop = [element0, element1, ..., elementn] // or let obj = {prop: [element0, element1, ...., elementn]} if you wish to initia...
...operty(3.4)) // true you can also populate an array when you create it: let myarray = new array('hello', myvar, 3.14159) // or let myarray = ['mango', 'apple', 'orange'] understanding length at the implementation level, javascript's arrays actually store their elements as standard object properties, using the array index as the property name. the length property is special. it always returns the index of the last element plus one. (in the example below, 'dusty' is indexed at 30, so cats.length returns 30 + 1). remember, javascript array indexes are 0-based: they start at 0, not 1. this means that the length property will be one more than the highest index stored in the array: let cats = [] cats[30] = ['dusty'] console.log(cats.length) // 31 you can also assign to the length prop...
...n(element) { console.log(element) }) // first // second // undefined // fourth since javascript elements are saved as standard object properties, it is not advisable to iterate through javascript arrays using for...in loops, because normal elements and all enumerable properties will be listed. ...
...And 20 more matches

Array.prototype.reduce() - JavaScript
gle output value. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. the reducer function takes four arguments: accumulator (acc) current value (cur) current index (idx) source array (src) your reducer function's returned value is assigned to the accumulator, whose value is remembered across each iteration throughout the array, and ultimately becomes the final, single resulting value. syntax arr.reduce(callback( accumulator, currentvalue, [, index[, array]] )[, initialvalue]) parameters callback a function to execute on each element in the array (except for the first, if no initialvalue is supplied). ...
...ion throughout the array, and ultimately becomes the final, single resulting value. syntax arr.reduce(callback( accumulator, currentvalue, [, index[, array]] )[, initialvalue]) parameters callback a function to execute on each element in the array (except for the first, if no initialvalue is supplied). it takes four arguments: accumulator the accumulator accumulates callback's return values. it is the accumulated value previously returned in the last invocation of the callback—or initialvalue, if it was supplied (see below). currentvalue the current element being processed in the array. index optional the index of the current element being processed in the array. starts from index 0 if an initialvalue is provided. otherwise, it starts from index 1. array optional ...
...tarts from index 1. array optional the array reduce() was called upon. initialvalue optional a value to use as the first argument to the first call of the callback. if no initialvalue is supplied, the first element in the array will be used as the initial accumulator value and skipped as currentvalue. calling reduce() on an empty array without an initialvalue will throw a typeerror. return value the single value that results from the reduction. description the reduce() method executes the callback once for each assigned value present in the array, taking four arguments: accumulator currentvalue currentindex array the first time the callback is called, accumulator and currentvalue can be one of two values. if initialvalue is provided in the call to reduce(), then accumula...
...And 20 more matches

Tree View Details - Archive of obsolete content
it involves keeping track of which items have children and also which rows are open and closed. nesting level every row in the tree has a nesting level. the topmost rows are at level 0, the children of those rows are at level 1, their children at level 2 and so on. the tree will query the view for each row by calling its getlevel method to find out the level of that row. the view will need to return 0 for the outermost rows and higher values for inner rows. the tree will use this information to determine the hierarchical structure of the rows. in addition to the getlevel method, there is a hasnextsibling function which, given a row, should return true if there is another row afterwards at the same level. this function is used, specifically, to draw the nesting lines along the side of the tr...
...inner rows. the tree will use this information to determine the hierarchical structure of the rows. in addition to the getlevel method, there is a hasnextsibling function which, given a row, should return true if there is another row afterwards at the same level. this function is used, specifically, to draw the nesting lines along the side of the tree. the getparentindex method is expected to return the parent row of a given row, that is, the row before it with a lower nesting value. all of these methods must be implemented by the view for children to be handled properly. ...
... the iscontaineropen method is used to determine which items are opened and closed. the view is required to keep track of this. ...
...And 19 more matches

LiveConnect Overview - Archive of obsolete content
ng("hello world"); in the previous example, the variable mystring is a javaobject because it holds an instance of the java object string. as a javaobject, mystring has access to the public instance methods of java.lang.string and its superclass, java.lang.object. these java methods are available in javascript as methods of the javaobject, and you can call them as follows: mystring.length(); // returns 11 static members can be called directly on the javaclass object. alert(java.lang.integer.max_value); //alerts 2147483647 the packages object if a java class is not part of the java, sun, or netscape packages, you access it with the packages object. for example, suppose the redwood corporation uses a java package called redwood to contain various java classes that it implements. to create an i...
...lang.string("hello world"); working with java arrays when any java method creates an array and you reference that array in javascript, you are working with a javaarray. for example, the following code creates the javaarray x with ten elements of type int: var x = java.lang.reflect.array.newinstance(java.lang.integer, 10); like the javascript array object, javaarray has a length property which returns the number of elements in the array. unlike array.length, javaarray.length is a read-only property, because the number of elements in a java array are fixed at the time of creation. package and class references simple references to java packages and classes from javascript create the javapackage and javaclass objects. in the earlier example about the redwood corporation, for example, the referen...
...d to assign the name of a java class to a variable called theclass. the forname method throws an exception if the value you pass it does not evaluate to the name of a java class. ...
...And 19 more matches

How to embed the JavaScript engine
of the global object. */ static jsclass global_class = { "global", jsclass_global_flags, js_propertystub, js_deletepropertystub, js_propertystub, js_strictpropertystub, js_enumeratestub, js_resolvestub, js_convertstub, }; int main(int argc, const char *argv[]) { jsruntime *rt = js_newruntime(8l * 1024 * 1024, js_use_helper_threads); if (!rt) return 1; jscontext *cx = js_newcontext(rt, 8192); if (!cx) return 1; { // scope for our various stack objects (jsautorequest, rootedobject), so they all go // out of scope before we js_destroycontext. jsautorequest ar(cx); // in practice, you would want to exit this any // time you're spinning the event loop js::rootedobject global(c...
... { // scope for our various stack objects (jsautorequest, rootedobject), so they all go // out of scope before we js_destroycontext. ...
...*/ static jsclass global_clas...
...And 19 more matches

HTMLTextAreaElement - Web APIs
ect x="301" y="65" width="190" height="50" fill="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="396" y="94" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">htmltextareaelement</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties accesskey string: returns / sets the element's accesskey attribute. autocapitalize string: returns / sets the element's capitalization behavior for user input. valid values are: none, off, characters, words, sentences. autocomplete autofocus boolean: returns / sets the element's autofocus attribute, indicating that the control should have input focus when the page loads c...
...ccesskey attribute. autocapitalize string: returns / sets the element's capitalization behavior for user input. valid values are: none, off, characters, words, sentences. autocomplete autofocus boolean: returns / sets the element's autofocus attribute, indicating that the control should have input focus when the page loads cols unsigned long: returns / sets the element's cols attribute, indicating the visible width of the text area. defaultvalue string: returns / sets the control's default value, which behaves like the node.textcontent property. ...
...ns / sets the element's autofocus attribute, indicating that the control should have input focus when the page loads cols unsigned long: returns / sets the element's cols attribute, indicating the visible width of the text area. defaultvalue string: returns / sets the control's default value, which behaves like the node.textcontent property. disabled boolean: returns / sets the element's disabled attribute, indicating that the control is not available for interaction. form read only object: returns a reference to the parent form element. ...
...And 19 more matches

Using Service Workers - Web APIs
apps. setting up to play with service workers many service workers features are now enabled by default in newer versions of supporting browsers. if however you find that demo code is not working in your installed versions, you might need to enable a pref: firefox nightly: go to about:config and set dom.serviceworkers.enabled to true; restart browser. chrome canary: go to chrome://flags and turn on experimental-web-platform-features; restart browser (note that some features are now enabled by default in chrome.) opera: go to opera://flags and enable support for serviceworker; restart browser. microsoft edge: go to about:flags and tick enable service workers; restart browser. you’ll also need to serve your code via https — service workers are restricted to running across https for...
...o documents will have to be reloaded to actually be controlled. the below graphic shows a summary of the available service worker events: promises promises are a great mechanism for running async operations, with success dependant on one another. this is central to the way service workers work. promises can do a variety of things, but all you need to know for now is that if something returns a promise, you can attach .then() to the end and include callbacks inside it for success cases, or you can insert .catch() on the end if you want to include a failure callback. let’s compare a traditional synchronous callback structure to its asynchronous promise equivalent. sync try { const value = myfunction(); console.log(value); } catch(err) { console.log(err); } async myfunctio...
...e a failure callback. let’s compare a traditional synchronous callback structure to its asynchronous promise equivalent. sync try { const value = myfunction(); console.log(value); } catch(err) { console.log(err); } async myfunction().then((value) => { console.log(value); }).catch((err) => { console.log(err); }); in the first example, we have to wait for myfunction() to run and return value before any more of the code can execute. in the second example, myfunction() returns a promise for value, then the rest of the code can carry on running. when the promise resolves, the code inside then will be run, asynchronously. now for a real example — what if we wanted to load images dynamically, but we wanted to make sure the images were loaded before we tried to display them? thi...
...And 19 more matches

WindowOrWorkerGlobalScope.setInterval() - Web APIs
the setinterval() method, offered on the window and worker interfaces, repeatedly calls a function or executes a code snippet, with a fixed time delay between each call. it returns an interval id which uniquely identifies the interval, so you can remove it later by calling clearinterval(). this method is defined by the windoworworkerglobalscope mixin. syntax var intervalid = scope.setinterval(func, [delay, arg1, arg2, ...]); var intervalid = scope.setinterval(function[, delay]); var intervalid = scope.setinterval(code, [delay]); parameters func a function to be executed every delay milliseconds. the function is not passed any arguments, and no return value is expected. code an optional syntax allows you to include a string instead of a function, which is compiled and executed every ...
...ge of delay values. arg1, ..., argn optional additional arguments which are passed through to the function specified by func once the timer expires. note: passing additional arguments to setinterval() in the first syntax does not work in internet explorer 9 and earlier. if you want to enable this functionality on that browser, you must use a polyfill (see the callback arguments section). return value the returned intervalid is a numeric, non-zero value which identifies the timer created by the call to setinterval(); this value can be passed to windoworworkerglobalscope.clearinterval() to cancel the timeout. it may be helpful to be aware that setinterval() and settimeout() share the same pool of ids, and that clearinterval() and cleartimeout() can technically be used interchangeably. f...
...amap[npos]++ : bexit = true; if (beraseandstop && (orel.ref.nodetype - 1 | 1) === 3 && orel.ref.nodevalue) { bexit = true; ocurrent = orel.ref; spa...
...And 19 more matches

async function - JavaScript
e interactive demo project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax async function name([param[, param[, ...param]]]) { statements } parameters name the function’s name. param the name of an argument to be passed to the function. statements the statements comprising the body of the function. the await mechanism may be used. return value a promise which will be resolved with the value returned by the async function, or rejected with an exception thrown from, or uncaught within, the async function. description async functions can contain zero or more await expressions. await expressions suspend progress through an async function, yielding control and subsequently resuming progress only when an awaited promise-based asynch...
... an exception thrown from, or uncaught within, the async function. description async functions can contain zero or more await expressions. await expressions suspend progress through an async function, yielding control and subsequently resuming progress only when an awaited promise-based asynchronous operation is either fulfilled or rejected. the resolved value of the promise is treated as the return value of the await expression. use of async / await enables the use of ordinary try / catch blocks around asynchronous code. the await keyword is only valid inside async functions. if you use it outside of an async function's body, you will get a syntaxerror. the purpose of async/await is to simplify the syntax necessary to consume promise-based apis. the behavior of async/await is similar t...
... use of ordinary try / catch blocks around asynchronous code. the await keyword is only valid inside async functions. if you use it outside of an async function's body, you will get a syntaxerror. the purpose of async/await is to simplify the syntax necessary to consume promise-based apis. the behavior of async/await is similar to combining generators and promises. async functions always return a promise. if the return value of an async function is not explicitly a promise, it will be implicitly wrapped in a promise. for example, the following: async function foo() { return 1 } ...is equivalent to: function foo() { return promise.resolve(1) } the body of an async function can be thought of as being split by zero or more await expressions. top-level code, up to and including...
...And 19 more matches

nsIMsgIncomingServer
nsimsgincomingserver mailnews/base/public/nsimsgincomingserver.idlscriptable ??? add brief description of interface ??? ...
...simsgincomingserver.idlscriptable ??? add brief description of interface ??? ...
...chema for the local mail store, such as "mailbox", "imap", or "news" used to construct uris. read only. loginatstartup boolean logonfallback boolean maxmessagesize long offlinesupportlevel long password acstring passwordpromptrequired boolean if the password for the server is available either via authentication in the current session or from password manager stored entries, return false. otherwise, return true. if password is obtained from password manager, set the password member variable. read only. performingbiff boolean port long prettyname astring pretty name - should be "userid on hostname" if the pref is not set. realhostname acstring real hostname of the server (if server name is changed it is stored here) realusername acstring real username of the se...
...And 18 more matches

Navigator - Web APIs
s. a navigator object can be retrieved using the read-only window.navigator property. properties doesn't inherit any properties, but implements those defined in navigatorid, navigatorlanguage, navigatoronline, navigatorcontentutils, navigatorstorage, navigatorstorageutils, navigatorconcurrenthardware, navigatorplugins, and navigatorusermedia. ...
...roperties doesn't inherit any properties, but implements those defined in navigatorid, navigatorlanguage, navigatoronline, navigatorcontentutils, navigatorstorage, navigatorstorageutils, navigatorconcurrenthardware, navigatorplugins, and navigatorusermedia. standard navigatorid.appcodename read only returns the internal "code" name of the current browser. do not rely on this property to return the correct value. ...
...ose defined in navigatorid, navigatorlanguage, navigatoronline, navigatorcontentutils, navigatorstorage, navigatorstorageutils, navigatorconcurrenthardware, navigatorplugins, and navigatorusermedia. standard navigatorid.appcodename read only returns the internal "code" name of the current browser. do not rely on this property to return the correct value. navigatorid.appname read only returns a domstring with the official name of the browser. do not rely on this property to return the correct value. navigatorid.appversion read only returns the version of the browser as a domstring. do not rely on this property to return the correct value. navigator.battery read only returns a batterymanager object you can use to get information about the battery charging status. navigator.con...
...And 18 more matches

String - JavaScript
ns. see "string primitives and string objects" below. string literals can be specified using single or double quotes, which are treated identically, or using the backtick character `. this last form specifies a template literal: with this form you can interpolate expressions. character access there are two ways to access an individual character in a string. the first is the charat() method: return 'cat'.charat(1) // returns "a" the other way (introduced in ecmascript 5) is to treat the string as an array-like object, where individual characters correspond to a numerical index: return 'cat'[1] // returns "a" when using bracket notation for character access, attempting to delete or assign a value to these properties will not succeed. the properties involved are neither writable nor conf...
... } else { console.log(a + ' and ' + b + ' are equal.') } a similar result can be achieved using the localecompare() method inherited by string instances. note that a == b compares the strings in a and b for being equal in the usual case-sensitive way. if you wish to compare without regard to upper or lower case characters, use a function similar to this: function isequal(str1, str2) { return str1.touppercase() === str2.touppercase() } // isequal upper case is used instead of lower case in this function, due to problems with certain utf-8 character conversions. string primitives and string objects note that javascript distinguishes between string objects and primitive string values. (the same is true of boolean and numbers.) string literals (denoted by double or single quotes) an...
...rcase() === str2.touppercase() } // isequal upper case is used instead of lower case in this function, due to problems with certain utf-8 character conversions. string primitives and string objects note that javascript distinguishes between string objects and primitive string values. (the same is true of boolean and numbers.) string literals (denoted by double or single quotes) and strings returned from string calls in a non-constructor context (that is, called without using the new keyword) are primitive strings. javascript automatically converts primitives to string objects, so that it's possible to use string object methods for primitive strings. in contexts where a method is to be invoked on a primitive string or a property lookup occurs, javascript will automatically wrap the string ...
...And 18 more matches

Making asynchronous programming easier with async and await - Learn web development
c computer literacy, a reasonable understanding of javascript fundamentals, an understanding of async code in general and promises. objective: to understand promises and how to use them. the basics of async/await there are two parts to using async/await in your code. ...
... to using async/await in your code. the async keyword first of all we have the async keyword, which you put in front of a function declaration to turn it into an async function. an async function is a function that knows how to expect the possibility of the await keyword being used to invoke asynchronous code. try typing the following lines into your browser's js console: function hello() { return "hello" }; hello(); the function returns "hello" — nothing special, right? but what if we turn this into an async function? try the following: async function hello() { return "hello" }; hello(); ah. invoking the function now returns a promise. this is one of the traits of async functions — their return values are guaranteed to be converted to promises. you can also create an async functi...
...hing special, right? but what if we turn this into an async function? ...
...And 17 more matches

How to implement a custom autocomplete search component
er and slightly simplified mechanism that is used in "toolkit" applications such as firefox and xulrunner. thunderbird 2.x and seamonkey 1.1.x support the toolkit interfaces, although they do not use the same autocomplete widget. to use autocomplete with a xul textbox, all you need to do is set some attributes: <textbox type="autocomplete" autocompletesearch="history"/> the type="autocomplete" turns on the autocomplete mechanism and the autocompletesearch="history" sets the source for the autocomplete. there are more options and features, see xul:textbox_(firefox_autocomplete) for more details. the toolkit mechanism has built-in support for several autocomplete sources, including: history: search the browser's url history (firefox: 1.0+; seamonkey: 1.1+) form-history: search the values t...
...t, otherwise you might have problems if your component gets installed along another component derived from those same examples. that can happen! so, get a uuid from http://www.famkruithof.net/uuid/uuidgen, for example, and paste it in. basic example for gecko 2.0 and up (firefox 4 / thunderbird 3.3 / seamonkey 2.1) this example is your first best try because: it has no specific logic (it just returns a dummy array of choices) it doesn't care about compatibility with older gecko versions first copy the following javascript code into a file named basic_autocomplete.js into the components directory (or whatever components folder is appropriate in your case): warning: the uuid used below in chrome.manifest and assigned to class_id must be changed before use. const ci = components.interfa...
...mments) { this._searchstring = searchstring; this._searchresult = searchresult; this._defaultindex = defaultindex; this._errordescription = errordescription; this._results = results; this._comments = comments; } providerautocompleteresult.prototype = { _searchstring: "", _searchresult: 0, _defaultindex: 0, _errordescription: "", _results: [], _comments: [], /** * @return {string} the original search string */ get searchstring() { return this._searchstring; }, /** * @return {number} the result code of this result object, either: * result_ignored (invalid searchstring) * result_failure (failure) * result_nomatch (no matches found) * result_success (matches found) */ get searchresult() { return this._searchresult...
...And 17 more matches

CustomizableUI.jsm
h it, until the area has been registered. registermenupanel() register the menu panel node. this method should not be called by anyone apart from the built-in panelui. parameters apanel the panel dom node being registered. unregisterarea() unregister a customizable area. the inverse of registerarea. unregistering an area will remove all the (removable) widgets in the area, which will return to the panel, and destroy all other traces of the area within customizableui. note that this means the contents of the area's dom nodes will be moved to the panel or removed, but the area's dom node(s) themselves will stay. furthermore, by default the placements of the area will be kept in the saved state (!) and restored if you re-register the area at a later point. this is useful for add-ons t...
...rcedirty=true, we will flush to the prefs file. parameters aforcedirty force customizableui to flush to the prefs file when all batch updates have finished. createwidget() create a widget. to create a widget, you should pass an object with its desired properties. for a list of supported properties, see api-provided widgets. parameters aproperties the specification for the widget return value a wrapper around the created widget. note: if your extension is compatible with versions of firefox below 29, i.e. before customizableui was introduced, then you have to make sure that in case of running on newer browsers, xul overlay does not contain description of the button that you are creating with createwidget() method. otherwise, conflicting static xul overlay button and dynamic cu...
...es. however, it will keep the widget in the placements for whatever area it was in at the time. you can remove it from there yourself by calling customizableui.removewidgetfromarea(awidgetid). parameters awidgetid the id of the widget to destroy getwidget() get a wrapper object with information about the widget. parameters awidgetid the id of the widget whose information you need return value a wrapper around the widget as described above, or null if the widget is known not to exist (any more). nb: non-null return is no guarantee the widget exists because we cannot know in advance if an xul widget exists or not. getunusedwidgets() get an array of widget wrappers for all the widgets which are currently not in any area (so which are in the palette). parameters awindowpalett...
...And 17 more matches

Examples
n your temporary directory."); } else { throw new error("you don't have file.txt in your temporary directory."); } }); // unexpected errors should always be reported at the end of a promise chain. let lastpromise = newpromise.then(function onfulfill(){ }) .catch(function onreject(arejectreason) { console.warn('newpromise failed with reason: ', arejectreason); }); using a promise returned by a function (verbose) this example uses a verbose syntax, showing all the involved promises. components.utils.import("resource://gre/modules/osfile.jsm") let path = os.path.join(os.constants.path.tmpdir, "file.txt"); let promise = os.file.exists(path); let newpromise = promise.then(function onfulfill(aexists) { if (aexists) { console.log("you have file.txt in your temporary directo...
...ry directory."); } }); // unexpected errors should always be reported at the end of a promise chain. let lastpromise = newpromise.then(null, components.utils.reporterror); in this case, if the file existence check succeeds, the onfulfill callback is invoked. when the callback finishes execution, newpromise will be fulfilled with an undefined fulfillment value, because the callback does not return any value. when newpromise is fulfilled, nothing happens, because no fulfillment callback is specified and the return value of the last then method is ignored. if the file existence check fails, for example because access is denied, promise is rejected with an os.file.error instance. this state will propagate to newpomise, and components.utils.reporterror will report all the details of the excep...
..., nothing happens, because no fulfillment callback is specified and the return value of the last then method is ignored. if the file existence check fails, for example because access is denied, promise is rejected with an os.file.error instance. this state will propagate to newpomise, and components.utils.reporterror will report all the details of the exception to the console. ...
...And 17 more matches

Index
t as a personal certificate. (a personal certificate is a certificate for which the private key is in possession, and which could be used for signing data or for decrypting data.) a unique nickname can/should be assigned to the certificate at the time of import, which can later be used to easily identify and retrieve it. it's important to note that nss requires strict cleanup for all handles returned by nss. the application should always call the appropriate dereference (destroy) functions once a handle is no longer needed. this is particularly important for applications that might need to close a database and reinitialize nss using a different one, without restarting. such an operation might fail at runtime if data elements are still being referenced. in addition to the freebl, softoken...
... use your application code that supports proxies. when using hashing, encryption, and decryption functions, it is possible to stream data (as opposed to operating on a large buffer). create a context handle while providing all the parameters required for the operation, then call an “update” function multiple times to pass subsets of the input to nss. the data will be processed and either returned directly or sent to a callback function registered in the context. when done, you call a finalization function that will flush out any pending data and free the resources. this line is a placeholder for future sections that should explain how libpkix works and is designed. if you want to work with nss, it's often helpful to use the command line utilities that are provided by the nss devel...
...def struct { const char *hashname; secoidtag oid; } nametagpair; /* the hash algorithms supported */ static const nametagpair hash_names[] = { { "md2", sec_oid_md2 }, { "md5", sec_oid_md5 }, { "sha1", sec_oid_sha1 }, { "sha256", sec_oid_sha256 }, { "sha384", sec_oid_sha384 }, { "sha512", sec_oid_sha512 } }; /* maps a hash name to a secoidtag. ...
...And 17 more matches

Using the CSS Typed Object Model - Web APIs
ties — that are impacting an element. let's see how this works by creating our first example, which explores computedstylemap(). we start with some html: a paragraph with a link, as well as a definition list to which we will add all the css property / value pairs. <p> <a href="https://example.com">link</a> </p> <dl id="regurgitation"></dl> we add javascript to grab our unstyled link and return back a definition list of all the default css property values impacting the link using computedstylemap(). // get the element const myelement = document.queryselector('a'); // get the <dl> we'll be populating const styleslist = document.queryselector('#regurgitation'); // retrieve all computed styles with computedstylemap() const defaultcomputedstyles = myelement.computedstylemap(); // iterat...
...we iterate through the style map, creating a <dt> and <dd> for each property and value respectively. in browsers that support computedstylemap(), you'll see a list of all the css properties and values. in other browsers, you'll just see a link. did you realize how many defaul...
...the link has inherited font-weight: bold; from the paragraph's styles, listing it as font-weight: 700. custom properties, like our --color: red , are properties. as such, they are accessible via get(). you'll note that custom properties retain the value as written in the stylesheet, whereas computed styles will be listed as the computed value — color was listed as an rgb() val...
...And 17 more matches

NSS PKCS11 Functions
has the following parameters: modulespec is a pkcs #11 modulespec. parent is the moduledb that presented this module spec. for applications this value should be null. recurse is a boolean indicates whether or not the module should also launch additional pkcs #11 modules. this is only applicable if the loaded module is actually a moduledb rather than a pkcs #11 module (see pkcs11_module_specs). returns the function returns one of these values: if successful, a pointer to a secmodmodule. caller owns the reference if unsuccessful, null. description secmod_loadusermodule loads a new pkcs #11 module into nss and connects it to the current nss trust infrastructure. once the the module has been successfully loaded, other nss calls will use it in the normal course of searching. modulespec specifies...
...pecified in module specs used by secmod_loadusermodule. module will continue to function in the nss infrastructure until unloaded with secmod_unloadusermodule. secmod_unloadusermodule unload a pkcs #11 module. syntax #include "secmod.h" extern secstatus secmod_unloadusermodule(secmodmodule *module); parameters this function has the following parameters: module is the module to be unloaded. returns the function returns one of these values: if successful, secsuccess. if unsuccessful, secfailure. description secmod_unloadusermodule detaches a module from the nss trust domain and unloads it. the module should have previously been loaded by secmod_loadusermodule. secmod_closeuserdb close an already opened user database. note: the database must be in the internal token, and must be one create...
...ith secmod_openuserdb(). once the database is closed, the slot will remain as an empty slot until it's used again with secmod_openuserdb(). syntax #include <pk11pub.h> secstatus secmod_closeuserdb(pk11slotinfo *slot) parameters this function has the following parameter: slot a pointer to a slot info structure. this slot must a a slot created by secmod_openuserdb() at some point in the past. returns the function returns one of these values: if successful, secsuccess). if unsuccessful, secfailure. secmod_openuserdb open a new database using the softoken. syntax #include "pk11pub.h" pk11slotinfo *secmod_openuserdb(const char *modulespec) parameters this function has the following parameters: modulespec is the same data that you would pass to softoken at initialization time under the 'to...
...And 16 more matches

HTMLMediaElement - Web APIs
ally playing audio when the user doesn't expect or desire it is a poor user experience and should be avoided in most cases, though there are exceptions. see the autoplay guide for media and web audio apis for more information. keep in mind that browsers may ignore autoplay requests, so you should ensure that your code isn't dependent on autoplay working. htmlmediaelement.buffered read only returns a timeranges object that indicates the ranges of the media source that the browser has buffered (if any) at the moment the buffered property is accessed. htmlmediaelement.controller is a mediacontroller object that represents the media controller assigned to the element, or null if none is assigned. htmlmediaelement.controls is a boolean that reflects the controls html attribute, indicating ...
... buffered property is accessed. htmlmediaelement.controller is a mediacontroller object that represents the media controller assigned to the element, or null if none is assigned. htmlmediaelement.controls is a boolean that reflects the controls html attribute, indicating whether user interface items for controlling the resource should be displayed. ...
... htmlmediaelement.currenttime a double-precision floating-point value indicating the current playback time in seconds; if the media has not started to play and has not been seeked, this value is the media's initial playback time. setting this value seeks the media to the new time. ...
...And 16 more matches

Starting up and shutting down a WebXR session - Web APIs
will learn how to do these things in this article. accessing the webxr api your app's access to the webxr api begins with the xrsystem object. this object represents the overall webxr device suite available to you through the hardware and drivers available on the user's equipment. there is a global xrsystem object available for use by your document through the the navigator property xr, which returns the xrsystem object if suitable xr hardware is available for your use given the hardware available and your document's environment. thus the simplest code that fetches the xrsystem object is: const xr = navigator.xr; the value of xr will be null or undefined if webxr isn't available. webxr availability as a new and still in development api, webxr support is limited to specific devices and b...
...fill, provided by the immersive web working group that's in charge of the webxr standardization process. the polyfill brings support for webxr to browsers that don't have native webxr support, and smooths out the inconsistencies among implementations in the browsers that do have it, so it can sometimes also be useful even if webxr is natively available. here we define a getxr() function, which returns the xrsystem object after optionally installing the polyfill, assuming that the polyfill has been included or loaded using a prior <script> tag. let webxrpolyfill = null; function getxr(usepolyfill) { let tempxr; let temppoly; switch(usepolyfill) { case "if-needed": if (!navigator.xr) { webxrpolyfill = new webxrpolyfill(); } tempxr = navigator.xr; bre...
...the global variable webxrpolyfill is used only to retain a reference to the...
...And 16 more matches

Proxy - JavaScript
handler functions are sometimes called traps, presumably because they trap calls to the target object. the very simple trap in handler2 above redefines all property accessors: console.log(proxy2.message1); // worl...
...andler2 above redefines all property accessors: console.log(proxy2.message1); // world console.log(proxy2.message2); // world with the help of the reflect class we can give some accessors the original behavior and redefine others: const target = { message1: "hello", message2: "everyone" }; const handler3 = { get: function (target, prop, receiver) { if (prop === "message2") { return "world"; } return reflect.get(...arguments); }, }; const proxy3 = new proxy(target, handler3); console.log(proxy3.message1); // hello console.log(proxy3.message2); // world constructor proxy() creates a new proxy object. static methods proxy.revocable() creates a revocable proxy object. examples basic example in this simple example, the number 37 gets returned as the de...
... hello console.log(proxy3.message2); // world constructor proxy() creates a new proxy object. static methods proxy.revocable() creates a revocable proxy object. examples basic example in this simple example, the number 37 gets returned as the default value when the property name is not in the object. it is using the get handler. const handler = { get: function(obj, prop) { return prop in obj ? obj[prop] : 37; } }; const p = new proxy({}, handler); p.a = 1; p.b = undefined; console.log(p.a, p.b); // 1, undefined console.log('c' in p, p.c); // false, 37 no-op forwarding proxy in this example, we are using a native javascript object to which our proxy will forward all operations that are applied to it. const target = {}; const p = new proxy(target, {})...
...And 16 more matches

nsIHTMLEditor
roperty(in nsiatom aproperty, in astring aattribute, in astring avalue); void setparagraphformat(in astring aparagraphformat); void updatebaseurl(); attributes attribute type description iscssenabled boolean a boolean which is true is the htmleditor has been instantiated with css knowledge and if the css pref is currently checked. returninparagraphcreatesnewparagraph boolean a boolean indicating if a return key pressed in a paragraph creates another paragraph or just inserts a <br> at the caret. constants constant value description eleft 0 ecenter 1 eright 2 ejustify 3 methods adddefaultproperty() registers a default style p...
... for insertion override. void addinsertionlistener( in nsicontentfilter infilter ); parameters infilter function which callers want called during insertion. align() document me! void align( in astring aalign ); parameters aalign breakisvisible() checks whether a br node is visible to the user. boolean breakisvisible( in nsidomnode anode ); parameters anode return value candrag() decides if a drag should be started (for example, based on the current selection and mousepoint). boolean candrag( in nsidomevent aevent ); parameters aevent return value checkselectionstateforanonymousbuttons() checks if the anonymous nodes created by the html editor have to be refreshed or hidden depending on a possible new state of the selection. void chec...
...if aiscreatedhidden is true, the class "hidden" is added to the created element. ...
...And 15 more matches

eval() - JavaScript
example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax eval(string) parameters string a string representing a javascript expression, statement, or sequence of statements. the expression can include variables and properties of existing objects. return value the completion value of evaluating the given code. if the completion value is empty, undefined is returned. description eval() is a function property of the global object. the argument of the eval() function is a string. if the string represents an expression, eval() evaluates the expression. if the argument represents one or more javascript statements, eval() evaluates the statements. ...
... if you construct an arithmetic expression as a string, you can use eval() to evaluate it at a later time. for example, suppose you have a variable x. you can postpone evaluation of an expression involving x by assigning the string value of the expression, say "3 * x + 2", to a variable, and then calling eval() at a later point in your script. if the argument of eval() is not a string, eval() returns the argument unchanged. in the following example, the string constructor is specified and eval() returns a string object rather than evaluating the string. eval(new string('2 + 2')); // returns a string object containing "2 + 2" eval('2 + 2'); // returns 4 you can work around this limitation in a generic fashion by using tostring(). var expression = new string('2 + 2'); eval(expr...
...lowing example, the string constructor is specified and eval() returns a string object rather than evaluating the string. eval(new string('2 + 2')); // returns a string object containing "2 + 2" eval('2 + 2'); // returns 4 you can work around this limitation in a generic fashion by using tostring(). var expression = new string('2 + 2'); eval(expression.tostring()); // returns 4 if you use the eval function indirectly, by invoking it via a reference other than eval, as of ecmascript 5 it works in the global scope rather than the local scope. this means, for instance, that function declarations create global functions, and that the code being evaluated doesn't have access to local variables within the scope where it's being called. function test() { var x = 2, y =...
...And 15 more matches

Understanding WebAssembly text format - WebAssembly
y_magic 0000004: 0100 0000 ; wasm_binary_version adding functionality to your module ok, that’s not very interesting, let’s add some executable code to this module. all code in a webassembly module is grouped into functions, which have the following pseudo-code structure: ( func <signature> <locals> <body> ) the signature declares what the function takes (parameters) and returns (return values). the locals are like vars in javascript, but with explicit types declared. the body is just a linear list of low-level instructions. so this is similar to functions in other languages, even if it looks different because it is an s-expression. signatures and parameters the signature is a sequence of parameter type declarations followed by a list of return type declarations. ...
... the body is just a linear list of low-level instructions. so this is similar to functions in other languages, even if it looks different because it is an s-expression. signatures and parameters the signature is a sequence of parameter type declarations followed by a list of return type declarations. it is worth noting here that: the absence of a (result) means the function doesn’t return anything. in the current iteration, there can be at most 1 return type, but later this will be relaxed to any number. each parameter has a type explicitly declared; wasm currently has four available number types (plus reference types; see the reference types) section below): i32: 32-bit integer i64: 64-bit integer f32: 32-bit float f64: 64-bit float a single parameter is written (par...
...) after the signature, locals are listed with their type, for example (local i32). ...
...And 15 more matches

Textbox (XPFE autocomplete) - Archive of obsolete content
« xul reference home [ examples | attributes | properties | methods | related ] this element is created by setting the type attribute of a textbox to autocomplete. it is used to create a textbox with a popup containing a list of possible completions for what the user has started to type. the autocomplete functionality is handled through one of more session objects, each of which can return a set of results given the current value of the textbox. the sessions can be set using the searchsessions attribute or by calling the addsession method. attributes accesskey, alwaysopenpopup, autocompletesearch, autocompletesearchparam, autofill, autofillaftermatch, autofill, completedefaultindex, crop, disableautocomplete, disableautocomplete, disabled, disablehistory, enablehisto...
... maxlength type: integer the maximum number of characters that the textbox allows to be entered. maxrows type: integer the number of rows to show in the results list at a time. a scrollbar will appear so the user can scroll through the remaining items. minresultsforpopup obsolete since gecko 1.9.1 type: integer the minimum number of results that must be returned for the popup to be displayed. the default value is 1. a zero value will always open the popup unless the textbox is empty. this can be used to display additional items that are not autocomplete results. as of gecko 1.9.1, this attribute is now always specified in lower case. minresultsforpopup new in thunderbird 3requires seamonkey 2.0 type: integer the minimum number...
...layed. the default value is 1. a zero value will always open the popup unless the textbox is empty. this can be used to display additional items that are not autocomplete results. as of gecko 1.9.1, this attribute is now always specified in lower case. minresultsforpopup new in thunderbird 3requires seamonkey 2.0 type: integer the minimum number of results that must be returned for the popup to be displayed. the default value is 1. new in thunderbird 3requires seamonkey 2.0 a zero value will always open the popup. this can be used to display additional items that are not autocomplete results. nomatch type: boolean this attribute will be set to true if the last search resulted in no matches. overview an onchange attribute is an event listener to the obje...
...And 14 more matches

Gecko info for Windows accessibility vendors
event_system_alert. msaa tree vs. dom tree - what's the relation? the msaa tree and the dom tree are parallel structures, although the msaa tree is a subset of the dom tree. queryservice() can be used to switch between the interfaces (iaccessible, isimpledomdocument, isimpledomnode and isimpledomtext). if there is no msaa node for a dom node, or vice-versa, queryservice() will return null. anything that is focusable or conveys important information about the structure of the document is exposed in the msaa tree of iaccessibles. windows applications based on the gecko layout engine gecko is a rendering engine that mozilla, netscape and other new browsers use. gecko can render a variety of content, not just html and supports key web standards such as cascading style ...
...leobjectfromevent(), or on the root accessible of a window with any iaccessible method that takes a variant, such as get_accchild(). because screen readers usually cache an entire document's worth of data, it can be extremely useful for them to receive a child id that helps them correlate back to a known object. we provide support for this technique via isimpledomnode::get_nodeinfo(), which returns a uniqueid for any iaccessible that can be cached in the internal model. when an event is received, the negative childid should match one of these cached uniqueid's, if the entire document has been stored and kept current. keeping an internal cache current means getting new subtrees of iaccessibles whenever an event_reorder is received, indicating important changes have invalidated part of the m...
...otes about what we support intentional differences with internet explorer for the most part, where we support an msaa feature, we have tried to duplicate internet explorer's use of it. please let us know if you find any differences not listed here: accessible relations are supported the accnavigate() method can be used with new constants defined for gecko. the results are always returned via vt_dispatch. enum { navrelation_label_for = 0x1002 }; enum { navrelation_description_for = 0x100f }; these two relations can be used on object to determine what form control is being labelled or desribed. enum { navrelation_labelled_by = 0x1003 }; enum { navrelation_described_by = 0x100e }; these two relations are they inverse; they can be used on form controls. if the for...
...And 14 more matches

Utilities for nss samples
en); pr_fprintf(out, "%s", b64data); pr_fprintf(out, "\n"); if (b64data) { port_free(b64data); } } /* * printashex */ void printashex(prfiledesc* out, const unsigned char *data, unsigned int len) { unsigned i; int column; unsigned int limit = 15; unsigned int level = 1; column = level; if (!len) { pr_fprintf(out, "(empty)\n"); return; } for (i = 0; i < len; i++) { if (i != len - 1) { pr_fprintf(out, "%02x:", data[i]); column += 3; } else { pr_fprintf(out, "%02x", data[i]); column += 2; break; } if (column > 76 || (i % 16 == limit)) { newline(out); column = level; limit = i % 16; } ...
...mn += 3; } else { pr_fprintf(out, "%02x", data[i]); column += 2; break; } if (column > 76 || (i % 16 == limit)) { newline(out); column = level; limit = i % 16; } } if (column != level) { newline(out); } } /* * getdigit */ int getdigit(char c) { if (c == 0) { return -1; } if (c <= '9' && c >= '0') { return c - '0'; } if (c <= 'f' && c >= 'a') { return c - 'a' + 0xa; } if (c <= 'f' && c >= 'a') { return c - 'a' + 0xa; } return -1; } /* * hextobuf */ int hextobuf(unsigned char *instring, secitem *outbuf, prbool ishexdata) { int len = strlen((const char *)instring); int outlen = len+1/2; int...
...& c >= 'a') { return c - 'a' + 0xa; } return -1; } /* * hextobuf */ int hextobuf(unsigned char *instring, secitem *outbuf, prbool ishexdata) { int len = strlen((const char *)instring); int outlen = len+1/2; int truelen = 0; int digit1, digit2; outbuf->data = ishexdata ? ...
...And 14 more matches

nss tech note5
padding is the application's responsibility. you can find a list of cipher mechanisms in security/nss/lib/softoken/pkcs11.c - grep for ckf_en_de_. ...
...lib/softoken/pkcs11.c - grep for ckf_en_de_. ...
...iv is relevant only wh...
...And 14 more matches

nsITreeView
r 1 indropbefore 0 obsolete since gecko 1.8 indropon 1 obsolete since gecko 1.8 indropafter 2 obsolete since gecko 1.8 methods candrop() methods used by the drag feedback code to determine if a drag is allowable at the current location. to get the behavior where drops are only allowed on items, such as the mailnews folder pane, always return false when the orientation is not drop_on. note: drop_on will only be passed to candrop() if the item is a container; see iscontainer(). boolean candrop( in long index, in long orientation, in nsidomdatatransfer datatransfer ); parameters index the index of the row. orientation the position around the given row. defined in constants. datatransfer this parameter, added in gecko ...
...a container; see iscontainer(). boolean candrop( in long index, in long orientation, in nsidomdatatransfer datatransfer ); parameters index the index of the row. orientation the position around the given row. defined in constants. datatransfer this parameter, added in gecko 1.9.2, provides the data being dragged, so that it can be examined to determine if a drop is possible. return value true if a drop is allowed at the current location; otherwise false. candropbeforeafter() obsolete since gecko 1.8 (firefox 1.5 / thunderbird 1.5 / seamonkey 1.0) method used by the drag feedback code to determine if a drag is allowable at the current location. to get the behavior where drops are only allowed on items, such as the mailnews folder pane, always ret...
...drag feedback code to determine if a drag is allowable at the current location. to get the behavior where drops are only allowed on items, such as the mailnews folder pane, always return false from candropbeforeafter(). boolean candropbeforeafter( in long index, in boolean before ); parameters index the index of the item. before true to test drop before. false to test drop after. return value true if a drop event can occur. otherwise false. ...
...And 14 more matches

nsIVariant
g getaswstring(); native code only! void getaswstringwithsize(out pruint32 size, [size_is(size), retval] out wstring str); native code only! attributes attribute type description datatype pruint16 read only. native code only! methods native code only!getasacstring acstring getasacstring(); parameters none. return value the value is converted to an 8-bit string in the iso-8859-1 character set. if the value was utf16 then the high bits are lost. if the value was utf8 then it is converted to utf16 and the high bits are discarded. arrays and interface pointers cannot be converted to a string. violates the xpcom interface guidelines getasarray() nsresult getasarray( out pruint16 type, out nsiid iid, ...
...iid, out pruint32 count, out voidptr ptr ); parameters type the type of the array elements. iid the iid of the array elements, if they are interface pointers. count the number of elements in the array. ptr a copy of the array of underlying elements. (reference counted elements are not cloned, but their reference count is increased.) return value native code only!getasastring astring getasastring(); parameters none. return value the internal value is converted to a utf16 string. arrays and interface pointers cannot be converted to a string. native code only!getasautf8string autf8string getasautf8string(); parameters none. return value the internal value is converted to a utf8 string. an iso-8859-1 string is widened to a utf16 str...
...g. arrays and interface pointers cannot be converted to a string. native code only!getasautf8string autf8string getasautf8string(); parameters none. return value the internal value is converted to a utf8 string. an iso-8859-1 string is widened to a utf16 string first. arrays and interface pointers cannot be converted to a string. native code only!getasbool prbool getasbool(); parameters none. return value if possible, the internal value is converted to a double, which is then compared to zero. native code only!getaschar char getaschar(); parameters none. ...
...And 14 more matches

Using the CSS Painting API - Web APIs
the class that does all the magic, defining the context options and what to paint to the two-dimensional canvas that will be our image. registerpaint('headerhighlight', class { /* define if alphatransparency is allowed alpha is set to true by default. ...
... we have then used the paint() function to paint to our canvas. a paint() function can take three arguments. here we have provided one argument: the rendering context (we'll look at more in due course), often refered to by the variable name ctx. ...
...s proportional to the size of the element's box model size. in the above image, the background proportional to the size of the element. the 3rd example has width: 50%; set on the block level element, making the element narrower and therefore the background image narrower. ...
...And 14 more matches

Element.classList - Web APIs
a domtokenlist with the length property equal to 0. the domtokenlist itself is read-only, although you can modify it using the add() and remove() methods. ...
...a domtokenlist with the length property equal to 0. the domtokenlist itself is read-only, although you can modify it using the add() and remove() methods. ...
...a domtokenlist with the length property equal to 0. ...
...And 14 more matches

Using IndexedDB - Web APIs
nd such feature will not be available."); } opening a database we start the whole process like this: // let us open our database var request = window.indexeddb.open("mytestdatabase", 3); see that? opening a database is just like any other operation — you have to "request" it. the open request doesn't open the database or start the transaction right away. the call to the open() function returns an idbopendbrequest object with a result (success) or error value that you handle as an event. most other asynchronous functions in indexeddb do the same thing - return an idbrequest object with the result or error. the result for the open function is an instance of an idbdatabase. the second parameter to the open method is the version of the database. the version of the database determines the...
...he transaction can either be in readonly or readwrite mode. to make changes to an existing object store, the transaction must be in readwrite mode. you open such transactions with idbdatabase.transaction. the method accepts two parameters: the storenames (the scope, defined as an array of object stores that you want to access) and the mode (readonly or readwrite) for the transaction. the method returns a transaction object containing the idbindex.objectstore method, which you can use to access your object store. by default, where no mode is specified, transactions open in readonly mode. note: as of firefox 40, indexeddb transactions have relaxed durability guarantees to increase performance (see bug 1112702.) previously in a readwrite transaction idbtransaction.oncomplete was fired only when...
...ion = db.transaction(["customers"], "readwrite"); // note: older experimental implementations use the deprecated constant idbtransaction.read_write instead of "readwrite". // in case you want to support such an implementation, you can write: // var transaction = db.transaction(["customers"], idbtransaction.read_write); the transaction() function takes two arguments (though one is optional) and returns a transaction object. the first argument is a list of object stores that the transaction will span. you can pass an empty array if you want the transaction to span all object stores, but don't do it because the spec says an empty array should generate an invalidaccesserror. if you don't specify anything for the second argument, you get a read-only transaction. since you want to write to it here ...
...And 14 more matches

SubtleCrypto.wrapKey() - Web APIs
ect specifying the algorithm to be used to encrypt the exported key, and any required extra parameters: to use rsa-oaep, pass an rsaoaepparams object. to use aes-ctr, pass an aesctrparams object. to use aes-cbc, pass an aescbcparams object. to use aes-gcm, pass an aesgcmparams object. to use aes-kw, pass the string "aes-kw", or an object of the form { "name": "aes-kw }. return value result is a promise that fulfills with an arraybuffer containing the encrypted exported key. exceptions the promise is rejected when one of the following exceptions is encountered: invalidaccesserror raised when the wrapping key is not a key for the requested wrap algorithm. notsupported raised when trying to use an algorithm that is either unknown or isn't suitable for encrypti...
...e wraps an aes key. it uses "raw" as the export format and aes-kw, with a password-derived key, to encrypt it. see the complete code on github. let salt; /* get some key material to use as input to the derivekey method. the key material is a password supplied by the user. ...
... */ function getkeymaterial() { const password = window.prompt("enter your password"); const enc = new textencoder(); return window.crypto.subtle.importkey( "raw", enc.encode(password), {name: "pbkdf2"}, false, ["derivebits", "derivekey"] ); } /* given some key material and some random salt derive an aes-kw key using pbkdf2. */ function getkey(keymaterial, salt) { return window.crypto.subtle.derivekey( { "name": "pbkdf2", salt: salt, "iterations": 100000, "hash": "sha-256" }, keymaterial, { "name": "aes-kw", "length": 256}, true, [ "wrapkey", "unwrapkey" ] ); } /* wrap the given key. */ async function wrapcryptokey(keytowrap) { // get the key encryption key const keymaterial = await getkeymaterial(); salt =...
...And 14 more matches

WebGLRenderingContext - Web APIs
canvas. webglrenderingcontext.drawingbufferwidth the read-only width of the current drawing buffer. should match the width of the canvas element associated with this context. webglrenderingcontext.drawingbufferheight the read-only height of the current drawing buffer. should match the height of the canvas element associated with this context. webglrenderingcontext.getcontextattributes() returns a webglcontextattributes object that contains the actual context parameters. might return null, if the context is lost. webglrenderingcontext.iscontextlost() returns true if the context is lost, otherwise returns false. webglrenderingcontext.makexrcompatible() ensures the context is compatible with the user's xr hardware, re-creating the context if necessary with a new configuration to do so...
...lized device coordinates to window or viewport coordinates. webglrenderingcontext.disable() disables specific webgl capabilities for this context. webglrenderingcontext.enable() enables specific webgl capabilities for this context. webglrenderingcontext.frontface() specifies whether polygons are front- or back-facing by setting a winding orientation. webglrenderingcontext.getparameter() returns a value for the passed parameter name. webglrenderingcontext.geterror() returns error information. webglrenderingcontext.hint() specifies hints for certain behaviors. the interpretation of these hints depend on the implementation. webglrenderingcontext.isenabled() tests whether a specific webgl capability is enabled or not for this context. webglrenderingcontext.linewidth() sets the line...
...context.bindbuffer() binds a webglbuffer object to a given target. webglrenderingcontext.bufferdata() updates buffer data. webglrenderingcontext.buffersubdata() updates buffer data starting at a passed offset. webglrenderingcontext.createbuffer() creates a webglbuffer object. webglrenderingcontext.deletebuffer() deletes a webglbuffer object. webglrenderingcontext.getbufferparameter() returns information about the buffer. webglrenderingcontext.isbuffer() returns a boolean indicating if the passed buffer is valid. framebuffers webglrenderingcontext.bindframebuffer() binds a webglframebuffer object to a given target. webglrenderingcontext.checkframebufferstatus() returns the status of the framebuffer. webglrenderingcontext.createframebuffer() creates a webglframebuffer obje...
...And 14 more matches

Arrow function expressions - JavaScript
is a syntactically compact alternative to a regular function expression, although without its own bindings to the this, arguments, super, or new.target keywords. arrow function expressions are ill suited as methods, and they cannot be used as constructors. ...
...am1, param2, …, paramn) => expression // equivalent to: => { return expression; } // parentheses are optional when there's only one parameter name: (singleparam) => { statements } singleparam => { statements } // the parameter list for a function with no parameters should be written with a pair of parentheses. ...
...ported var f = ([a, b] = [1, 2], {x: c} = {x: a + b}) => a + b + c; f(); // 6 description see also "es6 in depth: arrow functions" on hacks.mozilla.org. two factors influenced the introduction of arrow functions: the need for shorter functions and the behavior of the this keyword. ...
...And 14 more matches

Date - JavaScript
ngdom.) the user's device provides the local time. in addition to methods to read and alter individual components of the local date and time (such as getday() and sethours()), there are also versions of the same methods that read and manipulate the date and time using utc (such as getutcday() and setutchours()). constructor date() creates a new date object. static methods date.now() returns the numeric value corresponding to the current time—the number of milliseconds elapsed since january 1, 1970 00:00:00 utc, with leap seconds ignored. date.parse() parses a string representation of a date and returns the number of milliseconds since 1 january, 1970, 00:00:00 utc, with leap seconds ignored. note: parsing of strings with date.parse is strongly discouraged due to browser diff...
...eap seconds ignored. date.parse() parses a string representation of a date and returns the number of milliseconds since 1 january, 1970, 00:00:00 utc, with leap seconds ignored. note: parsing of strings with date.parse is strongly discouraged due to browser differences and inconsistencies. date.utc() accepts the same parameters as the longest form of the constructor (i.e. 2 to 7) and returns the number of milliseconds since january 1, 1970, 00:00:00 utc, with leap seconds ignored. instance methods date.prototype.getdate() returns the day of the month (1–31) for the specified date according to local time. ...
...ser differences and inconsistencies. date.utc() accepts the same parameters as the longest form of the constructor (i.e. 2 to 7) and returns the number of milliseconds since january 1, 1970, 00:00:00 utc, with leap seconds ignored. instance methods date.prototype.getdate() returns the day of the month (1–31) for the specified date according to local time. date.prototype.getday() returns the day of the week (0–6) for the specified date according to local time. date.prototype.getfullyear() returns the year (4 digits for 4-digit years) of the specified date according to local time. ...
...And 14 more matches

core/heritage - Archive of obsolete content
or writing such code requires sharp eye and lot's of discipline, mainly due to code fragmentation and lots of machinery being exposed: // defining a simple class function dog(name) { // classes are for creating instances, calling them without `new` changes // behavior, which in majority cases you need to handle, so you end up // with additional boilerplate. ...
... behavior, which in majority cases you need to handle, so you end up // with additional boilerplate. if (!(this instanceof dog)) return new dog(name); this.name = name; }; // to define methods you need to make a dance with a special 'prototype' // property of the constructor function. this is too much machinery exposed. dog.prototype.type = 'dog'; dog.prototype.bark = function bark() { return 'ruff! ruff!' }; // subclassing a `dog` function pet(name, breed) { // once again we do our little dance if (!(this instanceof pet)) return new pet(name, breed); dog.call(this, name); this.breed = breed; } // to subclass, you need to make another special dance with special // 'prototype' properties. pet.prototype = object.create(dog.prototype); // if you want correct instanceof behavior...
...her special dance with special // 'prototype' properties. pet.prototype = object.create(dog.prototype); // if you want correct instanceof behavior you need to make a dance with // another special `constructor` property of the `prototype` object. object.defineproperty(pet.prototype, 'constructor', { value: pet }); // finally you can define some properties. pet.prototype.call = function(name) { return this.name === name ? this.bark() : ''; }; since sdk apis may be interacting with untrusted code an extra security measures are required to guarantee that documented behavior can't be changed at runtime. to do that we need to freeze constructor's prototype chain to make sure functions are frozen: object.freeze(dog.prototype); object.freeze(pet.prototype); note: also, this is not quite enough as...
...And 13 more matches

listbox - Archive of obsolete content
be -1. (or, on some platforms, typeof(listboxcurrentindex) will be undefined) in a single selection list, the current index will always be the same as the selected index. in a multiple selection list, the currently focused row may be modified by the user without changing the selection by pressing the control key and pressing the cursor keys to navigate. currentitem type: listitem element returns the currently focused item in the list box, which is only useful in a multiple selection list box. disabled type: boolean gets and sets the value of the disabled attribute. disablekeynavigation type: boolean gets or sets the value of the disablekeynavigation attribute. itemcount type: integer read only property holding the number of child items. ...
... itemcount type: integer read only property holding the number of child items. listboxobject type: nsilistboxobject the nsilistboxobject behind the list box. this property is read-only. most of the features of the list box are already available directly in the listbox, so you will rarely have need to use this box object directly. ...
...ct type: nsilistboxobject the nsilistboxobject behind the list box. this property is read-only. most of the features of the list box are already available directly in the listbox, so you will rarely have need to use this box object directly. selectedcount type: integer returns the number of items that are currently selected. selectedindex type: integer returns the index of the currently selected item. you may select an item by assigning its index to this property. by assigning -1 to this property, all items will be deselected. returns -1 if no items are selected selecteditem type: element holds the currently selected item. if no item is currently selected, this value will be null. you can select an item by setting this value. a ...
...And 13 more matches

richlistbox - Archive of obsolete content
be -1. (or, on some platforms, typeof(listboxcurrentindex) will be undefined) in a single selection list, the current index will always be the same as the selected index. in a multiple selection list, the currently focused row may be modified by the user without changing the selection by pressing the control key and pressing the cursor keys to navigate. currentitem type: listitem element returns the currently focused item in the list box, which is only useful in a multiple selection list box. disabled type: boolean gets and sets the value of the disabled attribute. disablekeynavigation type: boolean gets or sets the value of the disablekeynavigation attribute. itemcount type: integer read only property holding the number of child items. ...
... type: boolean gets or sets the value of the disablekeynavigation attribute. itemcount type: integer read only property holding the number of child items. scrollboxobject type: nsiscrollboxobject the scroll box object implements the nsiscrollboxobject interface, which may be used to retrieve and adjust the scroll position of the list box. ...
...ger read only property holding the number of child items. scrollboxobject type: nsiscrollboxobject the scroll box object implements the nsiscrollboxobject interface, which may be used to retrieve and adjust the scroll position of the list box. selectedcount type: integer returns the number of items that are currently selected. selectedindex type: integer returns the index of the currently selected item. you may select an item by assigning its index to this property. by assigning -1 to this property, all items will be deselected. returns -1 if no items are selected selecteditem type: element holds the currently selected item. if no item is currently selected, this value will be null. you can select an item by setting this value. a...
...And 13 more matches

Componentizing our React app - Learn web development
ou run these! mkdir src/components touch src/components/todo.js our new todo.js file is currently empty! open it up and give it its first line: import react from "react"; since we're going to make a component called todo, you can start adding the code for that to todo.js too, as follows. ...
...js our new todo.js file is currently empty! open it up and give it its first line: import react from "react"; since we're going to make a component called todo, you can start adding the code for that to todo.js too, as follows. ...
...g the code for that to todo.js too, as follows. ...
...And 13 more matches

XPCOMUtils.jsm
using a form similar to this. mycomponent.prototype = { // properties required for xpcom registration: classdescription: "unique text description", classid: components.id("{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}"), contractid: "@example.com/xxx;1", // [optional] custom factory (an object implementing nsifactory). if not // provided, the default factory is used, which returns // |(new mycomponent()).queryinterface(iid)| in its createinstance(). _xpcom_factory: { ... }, // [optional] an array of categories to register this component in. _xpcom_categories: [{ // each object in the array specifies the parameters to pass to // nsicategorymanager.addcategoryentry(). 'true' is passed for // both apersist and areplace params. category: "some-categor...
...tegory only on the specified applications. apps: [ ... ] }], // queryinterface implementation, e.g. using the generateqi helper queryinterface: xpcomutils.generateqi( [components.interfaces.nsiobserver, components.interfaces.nsimyinterface, "nsifoo", "nsibar" ]), // [optional] classinfo implementation, e.g. using the generateci helper. // will be automatically returned from queryinterface if that was // generated with the generateqi helper. classinfo: xpcomutils.generateci( {classid: components.id("{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}"), contractid: "@example.com/xxx;1", classdescription: "unique text description", interfaces: [components.interfaces.nsiobserver, components.interfaces.nsimyinterface, ...
... methods definelazygetter() getter functions in javascript give you a way to define a property of an object, but not calculate the property's value until it is accessed. a getter defers the cost of calculating the value until the value is needed, and if it is never needed, you never pay the cost. a "lazy getter" provides an additional optimization: the...
...And 13 more matches

NSS Sample Code Utilities_1
en); pr_fprintf(out, "%s", b64data); pr_fprintf(out, "\n"); if (b64data) { port_free(b64data); } } /* * printashex */ void printashex(prfiledesc* out, const unsigned char *data, unsigned int len) { unsigned i; int column; unsigned int limit = 15; unsigned int level = 1; column = level; if (!len) { pr_fprintf(out, "(empty)\n"); return; } for (i = 0; i < len; i++) { if (i != len - 1) { pr_fprintf(out, "%02x:", data[i]); column += 3; } else { pr_fprintf(out, "%02x", data[i]); column += 2; break; } if (column > 76 || (i % 16 == limit)) { newline(out); column = level; limit = i % 16; } ...
...mn += 3; } else { pr_fprintf(out, "%02x", data[i]); column += 2; break; } if (column > 76 || (i % 16 == limit)) { newline(out); column = level; limit = i % 16; } } if (column != level) { newline(out); } } /* * getdigit */ int getdigit(char c) { if (c == 0) { return -1; } if (c <= '9' && c >= '0') { return c - '0'; } if (c <= 'f' && c >= 'a') { return c - 'a' + 0xa; } if (c <= 'f' && c >= 'a') { return c - 'a' + 0xa; } return -1; } /* * hextobuf */ int hextobuf(unsigned char *instring, secitem *outbuf, prbool ishexdata) { int len = strlen(instring); int outlen = len+1/2; int truelen = 0; ...
...if (c <= 'f' && c >= 'a') { return c - 'a' + 0xa; } return -1; } /* * hextobuf */ int hextobuf(unsigned char *instring, secitem *outbuf, prbool ishexdata) { int len = strlen(instring); int outlen = len+1/2; int truelen = 0; int digit1, digit2; outbuf->data = ishexdata ? ...
...And 13 more matches

Avoiding leaks in JavaScript XPCOM components
ns that cause leaks. basics of memory management creating objects that are not a fixed size for the lifetime of the program (global variables) or a fixed size for the lifetime of a function (stack variables) requires a system for dynamic memory allocation: a system that allocates memory from a space called the heap. the requirements for such a memory allocation system are: memory should be returned to the heap when the program no longer needs it (or soon thereafter) so that the amount of memory consumed by the program does not increase. programs should not dereference pointers pointing to memory that has been returned to the heap (and potentially reused). meeting both requirements at the same time can be tricky. many programming languages guarantee a solution for (2) and handle all the...
...nguages guarantee a solution for (2) and handle all the heap management for the programmer. however, this doesn't mean that (1) is also solved. the most common strategies for managing heap allocation are the following: malloc and free (or new and delete) the simplest strategy for heap allocation is that the programmer makes one function call to request memory from the heap and another one to return it. in c, these are malloc and free. in c++, they're new and delete. if the programmer forgets to return the memory to the heap, it leaks. if the programmer accesses the memory after returning it to the heap, the program will access whatever happens to be at that location, and will likely either behave nondeterministically or crash. with this strategy, a single pointer to the object is considered...
...ies the potential for crashes just like malloc and free). the potential causes of leaks with garbage collection (the next strategy) also apply to reference counting as well. garbage collection garbage collection is generally used to refer to algorithms that (1) determine which objects are still needed by starting from a set of roots and finding all objects reachable from those objects and (2) returning all remaining objects to the heap. the roots include things like global variables and variables on the current call stack. mozilla's javascript engine uses one of the most common garbage collection algorithms, mark and sweep, in which the garbage collector clears the mark bit on each object, sets the mark bits on all roots and all objects reachable from them, and then finalizes all objects not...
...And 13 more matches

IAccessible2
an extended role is a role which is dynamically generated by the application. it is not predefined by the ...
...pe, [in] long x, [in] long y ); [propget] hresult states([out] accessiblestates states ); [propget] hresult uniqueid([out] long uniqueid ); [propget] hresult windowhandle([out] hwnd windowhandle ); methods attributes() returns the attributes specific to this iaccessible2 object, such as a cell's formula. [propget] hresult attributes( [out] bstr attributes ); parameters attributes return value s_false returned if there is nothing to return, [out] value is null. s_ok. extendedrole() returns the extended role. ...
...an extended state is a state which is dynamically generated by the application. it is not predefined by the iaccessible2 specification. ...
...And 13 more matches

nsIMsgHeaderParser
exceptions thrown missing exception missing description n...
...n boolean preserveintegrity); methods extractheaderaddressmailboxes() given a string which contains a list of header addresses, returns a comma-separated list of just the 'mailbox' portions. if any of the addresses doesn't have a mailbox, then the user name is used instead. autf8string extractheaderaddressmailboxes( in string line ); parameters line the header line to parse. return value a comma-separated list of just the mailbox parts of the addresses. exceptions thrown missing exception missing description native code only!extractheaderaddressnames given a string which contains a list of header addresses, returns a comma-separated list of just the 'user name' portions. if any of the addresses doesn't have a name, then the mailbox is used instead. autf8string ex...
...missing exception missing description native code only!extractheaderaddressnames given a string which contains a list of header addresses, returns a comma-separated list of just the 'user name' portions. if any of the addresses doesn't have a name, then the mailbox is used instead. autf8string extractheaderaddressnames( in string line ); parameters line the header line to parse. return value a comma-separated list of just the name parts of the addresses. ...
...And 13 more matches

nsISessionStore
ers awindow the window in which to delete the value. akey the key whose value is to be deleted. duplicatetab() duplicates a specified tab as thoroughly as possible. nsidomnode duplicatetab( in nsidomwindow awindow, in nsidomnode atab ); parameters awindow the window in which the duplicated tab will be created. atab the tab to duplicate (can come from a different window). ...
...icate (can come from a different window). return value an nsidomnode representing the new tab, the content of which is a duplicate of atab. forgetclosedtab() nsidomnode forgetclosedtab( in nsidomwindow awindow, in unsigned long aindex ); parameters awindow is the browser window associated with the closed tab. aindex is the index of the closed tab to be removed (fifo ordered). return value forgetclosedwindow() nsidomnode forgetclosedwindow( in unsigned long aindex ); parameters aindex is the index of the closed window to be removed (fifo ordered). return value exceptions thrown ns_error_invalid_arg when aindex does not map to a closed window. getbrowserstate() returns the current state of all of windows and all of their tabs. astring getbrowserstate()...
...dow() nsidomnode forgetclosedwindow( in unsigned long aindex ); parameters aindex is the index of the closed window to be removed (fifo ordered). return value exceptions thrown ns_error_invalid_arg when aindex does not map to a closed window. getbrowserstate() returns the current state of all of windows and all of their tabs. astring getbrowserstate(); parameters none. return value a json string representing the current state of all windows in the web browser. getclosedtabcount() returns the number of restorable tabs for a given window. unsigned long getclosedtabcount( in nsidomwindow awindow ); parameters awindow the window whose restorable tab count should be returned. return value the number of restorable tabs in the window. getclosedtabdata() retu...
...And 13 more matches

Using readable streams - Web APIs
xample, our simple stream pump example goes on to enqueue each chunk in a new, custom readablestream (we will find more about this in the next section), then create a new response out of it, consume it as a blob, create an object url out of that blob using url.createobjecturl(), and then display it on screen in an <img> element, effectively creating a copy of the image we originally fetched. ...
...each chunk in a new, custom readablestream (we will find more about this in the next section), then create a new response out of it, consume it as a blob, create an object url out of that blob using url.createobjecturl(), and then display it on screen in an <img> element, effectively creating a copy of the image we originally fetched. ...
...will find more about this in the next section), then create a new response out of it, consume it as a blob, create an object url out of that blob using url.createobjecturl(), and then display it on screen in an <img> element, effectively creating a copy of the image we originally fetched. ...
...And 13 more matches

Inputs and input sources - Web APIs
target ray is emitted (such as the front tip of the controller, or the end of a gun barrel if the controller is being rendered as a gun, for example), and the space's orientation vector extends outward along the path of the target ray. you can easily obtain the target ray corresponding to the targetrayspace from within the drawing handler for a given frame using xrframe's getpose() method. the returned xrpose's transform is the transform corresponding to the target ray. thus, for an input controller primaryinput: let targetraypose = frame.session.getpose(primaryinput.targetrayspace, viewerrefspace); let targetrayorigin = targetraypose.transform.position; let targetrayvector = targetraypose.transform.orientation; with this, you now have the point from which the target...
...t handler is replaced with the function realselecthandler(), which will be used for handling all future select events. then we pass the event through to realselecthandler() to allow the event to be processed as normal. let primaryinputsource = xrsession.inputsources[0]; xrsession.onselect = function(event) { primaryinputsource = event.inputsource; xrsession.onselect = realselecthandler; return realselecthandler(event); }; the effect is that we set the primary input source the first time a select event is received, regardless of which input source it comes from, handle the event as normal from there, and from then on simply handle the events as usual without any further worries about which input source is primary. user-selected the most complex way to determine a primary input sourc...
... event. xrsession.addeventlistener("select", event => { let inputsource = event.inputsource; let frame = event.frame; /* handle the event */ }); some actions may send these events very quickly, one after the other. the time that elapses between these events depends on both the hardware apparatus that causes the action as well as the software drivers that interpret the hardware action and turn it into a series of events. do not presume these events will happen with any particular amount of time between them. for example, if the hardware that causes the primary action to occur is a button, you would receive selectstart when the user presses the button, then select and selectend when the user releases it. there are a number of examples showing how to handle select events throughout the...
...And 13 more matches

Closures - JavaScript
ested. the word lexical refers to the fact that lexical scoping uses the location where a variable is declared within the source code to determine where that variable is available. nested functions have access to variables declared in their outer scope. closure consider the following code example: function makefunc() { var name = 'mozilla'; function displayname() { alert(name); } return displayname; } var myfunc = makefunc(); myfunc(); running this code has exactly the same effect as the previous example of the init() function above. what's different (and interesting) is that the displayname() inner function is returned from the outer function before being executed. at first glance, it might seem unintuitive that this code still works. in some programming languages, the loca...
...nstance of the function displayname created when makefunc is run. the instance of displayname maintains a reference to its lexical environment, within which the variable name exists. for this reason, when myfunc is invoked, the variable name remains available for use, and "mozilla" is passed to alert. here's a slightly more interesting example—a makeadder function: function makeadder(x) { return function(y) { return x + y; }; } var add5 = makeadder(5); var add10 = makeadder(10); console.log(add5(2)); // 7 console.log(add10(2)); // 12 in this example, we have defined a function makeadder(x), that takes a single argument x, and returns a new function. the function it returns takes a single argument y, and returns the sum of x and y. in essence, makeadder is a function factory. ...
...using the relative em unit: body { font-family: helvetica, arial, sans-serif; font-size: 12px; } h1 { font-size: 1.5em; } h2 { font-size: 1.2em; } such interactive text size buttons can change the font-size property of the body element, and the adjustments are picked up by other elements on the page thanks to the relative units. here's the javascript: function makesizer(size) { return function() { document.body.style.fontsize = size + 'px'; }; } var size12 = makesizer(12); var size14 = makesizer(14); var size16 = makesizer(16); size12, size14, and size16 are now functions that resize the body text to 12, 14, and 16 pixels, respectively. you can attach them to buttons (in this case hyperlinks) as demonstrated in the following code example. document.getelementbyid('siz...
...And 13 more matches

Numbers and dates - JavaScript
ng table summarizes the number object's properties. ...
...y description number.max_value the largest representable number (±1.7976931348623157e+308) number.min_value the smallest representable number (±5e-324) number.nan special "not a number" value number.negative_infinity special negative infinite value; returned on overflow number.positive_infinity special positive infinite value; returned on overflow number.epsilon difference between 1 and the smallest value greater than 1 that can be represented as a number (2.220446049250313e-16) number.min_safe_integer minimum safe integer in javascript (−253 + 1, or −9007199254740991) number.max_safe_integer maximum safe integer in javascript (+253 − 1, or +9007199254740991) methods of numbe...
... same as the global parseint() function. number.isfinite() determines whether the passed value is a finite number. number.isinteger() determines whether the passed value is an integer. ...
...And 13 more matches

Object - JavaScript
re seen by all objects through prototype chaining, unless the properties and methods subject to those changes are overridden further along the prototype chain. this provides a very powerful although potentially dangerous mechanism to override or extend object behavior. the object constructor creates an object wrapper for the given value. if the value is null or undefined, it will create and return an empty object. otherwise, it will return an object of a type that corresponds to the given value. if the value is an object already, it will return the value. when called in a non-constructor context, object behaves identically to new object(). see also the object initializer / literal syntax. deleting a property from an object there isn't any method in an object itself to delete its own...
...ues of all enumerable own properties from one or more source objects to a target object. object.create() creates a new object with the specified prototype object and properties. object.defineproperty() adds the named property described by a given descriptor to an object. object.defineproperties() adds the named properties described by the given descriptors to an object. ...
...operty described by a given descriptor to an object. object.defineproperties() adds the named properties described by the given descriptors to an object. object.entries() returns an array containing all of the [key, value] pairs of a given object's own enumerable string properties. object.freeze() freezes an object. other code cannot delete or change its properties. object.fromentries() returns a new object from an iterable of [key, value] pairs. (this is the reverse of object.entries). object.getownpropertydescriptor() returns a property descriptor for a named property on an object. ...
...And 13 more matches

Promise - JavaScript
an asynchronous operation, and its resulting value. to learn about the way promises work and how you can use them, we advise you to read using promises first. description a promise is a proxy for a value not necessarily known when the promise is created. it allows you to associate handlers with an asynchronous action's eventual success value or failure reason. this lets asynchronous methods return values like synchronous methods: instead of immediately returning the final value, the asynchronous method returns a promise to supply the value at some point in the future. a promise is in one of these states: pending: initial state, neither fulfilled nor rejected. fulfilled: meaning that the operation completed successfully. rejected: meaning that the operation failed. a pending promise...
...hese options happens, the associated handlers queued up by a promise's then method are called. if the promise has already been fulfilled or rejected when a corresponding handler is attached, the handler will be called, so there is no race condition between an asynchronous operation completing and its handlers being attached. as the promise.prototype.then() and promise.prototype.catch() methods return promises, they can be chained. not to be confused with: several other languages have mechanisms for lazy evaluation and deferring a computation, which they also call "promises", e.g. scheme. promises in javascript represent processes that are already happening, which can be chained with callback functions. if you are looking to lazily evaluate an expression, consider the arrow function with n...
...ill also hear the term resolved used with promises — this means that the promise is settled or “locked in” to match the state of another promise. states and fates contains more details about promise terminology. chained promises the methods promise.then(), promise.catch(), and promise.finally() are used to associate further action with a promise that becomes settled. these methods also return a newly generated promise object, which can optionally be used for chaining; for example, like this: const mypromise = (new promise(myexecutorfunc)) .then(handlefulfilleda,handlerejecteda) .then(handlefulfilledb,handlerejectedb) .then(handlefulfilledc,handlerejectedc); // or, perhaps better ... const mypromise = (new promise(myexecutorfunc)) .then(handlefulfilleda) .then(hand...
...And 13 more matches

Iteration protocols - JavaScript
r, such as array or map, while other types (such as object) are not. in order to be iterable, an object must implement the @@iterator method, meaning that the object (or one of the objects up its prototype chain) must have a property with a @@iterator key which is available via constant symbol.iterator: property value [symbol.iterator] a zero-argument function that returns an object, conforming to the iterator protocol. whenever an object needs to be iterated (such as at the beginning of a for...of loop), its @@iterator method is called with no arguments, and the returned iterator is used to obtain the values to be iterated. note that when this zero-argument function is called, it is invoked as a method on the iterable object. therefore inside of the funct...
...iterated. note that when this zero-argument function is called, it is invoked as a method on the iterable object. therefore inside of the function, the this keyword can be used to access the properties of the iterable object, to decide what to provide during the iteration. this function can be an ordinary function, or it can be a generator function, so that when invoked, an iterator object is returned. inside of this generator function, each entry can be provided by using yield. the iterator protocol the iterator protocol defines a standard way to produce a sequence of values (either finite or infinite), and potentially a return value when all values have been generated. an object is an iterator when it implements a next() method with the following semantics: property value ...
...rovided by using yield. the iterator protocol the iterator protocol defines a standard way to produce a sequence of values (either finite or infinite), and potentially a return value when all values have been generated. an object is an iterator when it implements a next() method with the following semantics: property value next() a zero-argument function that returns an object with at least the following two properties: done (boolean) has the value false if the iterator was able to produce the next value in the sequence. (this is equivalent to not specifying the done property altogether.) has the value true if the iterator has completed its sequence. in this case, value optionally specifies the return value of the iterator. va...
...And 13 more matches

Index - XPath
tors, xpath this article seeks to document the difference between css selectors and xpath for web developers to be able to better choose the right tool for the right job. 17 functions transforming_xml_with_xslt, xpath, xpath_reference, xslt, xslt_reference no summary! 18 boolean xslt, xslt_reference the boolean function evaluates an expression and returns true or false. 19 ceiling xslt, xslt_reference the ceiling function evaluates a decimal number and returns the smallest integer greater than or equal to the decimal number. 20 choose function, xpath, xslt the choose function returns one of the specified objects based on a boolean parameter. 21 concat xslt, xslt_reference the co...
..._reference the ceiling function evaluates a decimal number and returns the smallest integer greater than or equal to the decimal number. 20 choose function, xpath, xslt the choose function returns one of the specified objects based on a boolean parameter. 21 concat xslt, xslt_reference the concat function concatenates two or more strings and returns the resulting string. 22 contains xslt, xslt_reference the contains function determines whether the first argument string contains the second argument string and returns boolean true or false. 23 count xslt, xslt_reference the count function counts the number of nodes in a node-set and returns an integer. 24 current xslt, xslt_referenc...
... xslt, xslt_reference the count function counts the number of nodes in a node-set and returns an integer. 24 current xslt, xslt_reference the current function can be used to get the context node in an xslt instruction. 25 document xslt, xslt_reference the document finds a node-set in an external document, or multiple external documents, and returns the resulting node-set. 26 element-available xslt, xslt_reference the element-available function determines if an element is available and returns true or false. 27 false xslt, xslt_reference the false function returns boolean false. ...
...And 13 more matches

lang/type - Archive of obsolete content
functions for working with type detection. globals functions isundefined(value) returns true if value is undefined, false otherwise. let { isundefined } = require('sdk/lang/type'); var foo; isundefined(foo); // true isundefined(0); // false parameters value : mixed the variable to check. returns boolean : boolean indicating if value is undefined. isnull(value) returns true if value is null, false otherwise. let { isnull } = require('sdk/lang/type'); isnull(null); // true isnull(false); // false parameters value : mixed the variable to check. returns boolean : boolean indicating if value is null. isstring(value) returns true if value is a string, false otherwise. uses typeof operator to check type, and will only properly detect string primitives: for example, a string ...
... require('sdk/lang/type'); isnull(null); // true isnull(false); // false parameters value : mixed the variable to check. returns boolean : boolean indicating if value is null. isstring(value) returns true if value is a string, false otherwise. uses typeof operator to check type, and will only properly detect string primitives: for example, a string created with new string() will always return false. let { isstring } = require('sdk/lang/type'); isstring('my string'); // true isstring(100); // false isstring('100'); // true parameters value : mixed the variable to check. returns boolean : boolean indicating if value is a string. isnumber(value) returns true if value is a number, false otherwise. uses typeof operator to check type, and will only properly detect number primitives...
...'my string'); // true isstring(100); // false isstring('100'); // true parameters value : mixed the variable to check. returns boolean : boolean indicating if value is a string. isnumber(value) returns true if value is a number, false otherwise. uses typeof operator to check type, and will only properly detect number primitives: for example, a number created with new number() will always return false. let { isnumber } = require('sdk/lang/type'); isnumber(3.1415); // true isnumber(100); // true isnumber('100'); // false parameters value : mixed the variable to check. returns boolean : boolean indicating if value is a number. isregexp(value) returns true if value is a regexp, false otherwise. let { isregexp } = require('sdk/lang/type'); isregexp(/[^\.]*\.js$/); // true isregexp...
...And 12 more matches

places/bookmarks - Archive of obsolete content
three constructors: bookmark, group, and separator, corresponding to the types of objects, referred to as bookmark items, in the bookmarks database in firefox two additional functions, save() to create, update, and remove bookmark items, and search() to retrieve the bookmark items that match a particular set of criteria. save() and search() are both asynchronous functions: they synchronously return a placesemitter object, which then asynchronously emits events as the operation progresses and completes. each retrieved bookmark item represents only a snapshot of state at a specific time. the module does not automatically sync up a bookmark instance with ongoing changes to that item in the database from the same add-on, other add-ons, or the user. examples creating a new bookmark let { boo...
...be saved since all bookmarks are children // of `group`. this will be saved implicitly. save(bookmarks).on("data", function (saved, input) { // a data event is called once for each item saved, as well // as implicit items, like `group` console.log(input === group || ~bookmarks.indexof(input)); // true }).on("end", function (saves, inputs) { // like the previous example, the "end" event returns an // array of all of our updated saves. only explicitly saved // items are returned in this array -- the `group` won't be // present here. console.log(saves[0].title); // "ran" console.log(saves[2].group.title); // "guitars" }); searching for bookmarks bookmarks can be queried with the search() function, which accepts a query object or an array of query objects, as well as a query o...
... p...
...And 12 more matches

window/utils - Archive of obsolete content
functions for working with browser windows. usage private windows with this module your add-on will see private browser windows even if it has not explicitly opted into private browsing, so you need to take care not to store any user data derived from private browser windows. the exception is the windows() function which returns an array of currently opened windows. ...
...ed windows. private windows will not be included in this list if your add-on has not opted into private browsing. to learn more about private windows, how to opt into private browsing, and how to support private browsing, refer to the documentation for the private-browsing module. globals functions getmostrecentbrowserwindow() get the topmost browser window, as an nsidomwindow instance. returns nsidomwindow: the topmost browser window. getinnerid(window) returns the id of the specified window's current inner window. this function wraps nsidomwindowutils.currentinnerwindowid. parameters window : nsidomwindow the window whose inner window we are interested in. returns id: the given window's id. getouterid(window) returns the id of the specified window's outer window. this funct...
...function wraps nsidomwindowutils.currentinnerwindowid. parameters window : nsidomwindow the window whose inner window we are interested in. returns id: the given window's id. getouterid(window) returns the id of the specified window's outer window. this function wraps nsidomwindowutils.outerwindowid. parameters window : nsidomwindow the window whose outer window we are interested in. returns id: the outer window's id. ...
...And 12 more matches

Client-side form validation - Learn web development
button> element) htmlfieldsetelement (represents a <fieldset> element) htmlinputelement (represents an <input> element) htmloutputelement (represents an <output> element) htmlselectelement (represents a <select> element) htmltextareaelement (represents a <textarea> element) the constraint validation api makes the following properties available on the above elements. ...
...tarea> element) the constraint validation api makes the following properties available on the above elements. validationmessage: returns a localized message describing the validation constraints that the control doesn't satisfy (if any). if the control is not a candidate for constraint validation (willvalidate is false) or the element's value satisfies its constraints (is valid), this will return an empty string. validity: returns a validitystate object that contains several properties describing the validity state of the element. you can find full details of all the available properties in the validitystate reference page; below is listed a few of the more common ones: patternmismatch: returns true if the value does not match the specified pattern, and false if it does match. if t...
...ins several properties describing the validity state of the element. you can find full details of all the available properties in the validitystate reference page; below is listed a few of the more common ones: patternmismatch: returns true if the value does not match the specified pattern, and false if it does match. if true, the element matches the :invalid css pseudo-class. toolong: returns true if the value is longer than the maximum length specified by the maxlength attribute, or false if it is shorter than or equal to the maximum. if true, the element matches the :invalid css pseudo-class. tooshort: returns true if the value is shorter than the minimum length specified by the minlength attribute, or false if it is greater than or equal to the minimum. if true, the element mat...
...And 12 more matches

Making decisions in your code — conditionals - Learn web development
seudocode: if (condition) { code to run if condition is true } else { run some other code instead } here we've got: the keyword if followed by some parentheses. a condition to test, placed inside the parentheses (typically "is this value bigger than this other value?", or "does this value exist?"). the condition makes use of the comparison operators we discussed in the last module and returns true or false. a set of curly braces, inside which we have some code — this can be any code we like, and it only runs if the condition returns true. the keyword else. another set of curly braces, inside which we have some more code — this can be any code we like, and it only runs if the condition is not true — or in other words, the condition is false. this code is pretty human-readab...
... inside which we have some code — this can be any code we like, and it only runs if the condition returns true. the keyword else. another set of curly braces, inside which we have some more code — this can be any code we like, and it only runs if the condition is not true — or in other words, the condition is false. ...
...this is not necessarily a bad thing, but it might not be what you want — often you want to run one block of code or the other, not both. as a final point, you may sometimes see if...else statements written without the curly braces, in the following shorthand style: if (condition) code to run if condition is true else run some other code instead this is perfectly valid code, b...
...And 12 more matches

Fetching data from the server - Learn web development
request method to use to request the resource from the network, and what its url is. we'll just use the get method here and set the url as our url variable. add this below your previous line: request.open('get', url); next, we'll set the type of response we are expecting — which is defined by the request's responsetype property — as text. ...
...when this has occurred, the response data will be available in the response property of the xhr request object. ...
...when this has occurred, the response data will be available in the response property of the xhr request object. add the following below your last addition. ...
...And 12 more matches

Sqlite.jsm
al) if defined, the connection will attempt to minimize its memory usage after this many milliseconds of connection idle. the connection is idle when no statements are executing. there is no default value which means no automatic memory minimization will occur. please note that this is not a timer on the idle service and this could fire while the application is active. openconnection(options) returns a promise that resolves to an opened connection instance or is rejected if an error occurred while opening the database. here is an example: components.utils.import("resource://gre/modules/sqlite.jsm"); try { const conn = await sqlite.openconnection({ path: "mydatabase.sqlite", sharedmemorycache: false }); // connection is the opened sqlite connection (see below for api). } catch (error) ...
... instance. connection management these apis are used to manage and inspect the state of the connection. close() close this database connection. this must be called on every opened connection or else application shutdown will fail due to waiting on the opened connection to close (gecko doesn't force close connections because it doesn't know that you are really done with them). this function returns a promise that will be resolved when the database has closed. if a transaction is in progress at the time this function is called, the transaction will be forcibly rolled back. if statements are in progress at the time this function is called, they will be cancelled. callers should not attempt to use the connection after calling this method as the connection will be unusable. it is possible ...
...sed with the shutdown hook: const conn = await sqlite.openconnection({ path: "mydatabase.sqlite", sharedmemorycache: false }); try { sqlite.shutdown.addblocker("my connection closing", async () => await conn.close()); } catch (e) { // it's too late to block shutdown, just close the connection. await conn.close(); throw e; } clone(readonly) this function returns a clone of the current connection-promise. these functions receive the following arguments: readonly (optional) if true the clone will be read-only, default is false. if the original connection is already read-only, the clone will be, regardless of this option. if the original connection is using the shared cache, this parameter will be ignored and the clone will be as privileged as the o...
...And 12 more matches

Task.jsm
introduction for an introduction to tasks, you may start from the task.js documentation, keeping in mind that only the core subset is implemented in this module. tasks are built upon generator functions and promises. the task.spawn() function takes a generator function and starts running it as a task. every time the task yields a promise, it waits until the promise is resolved. ...
...ts until the promise is resolved. task.spawn() returns a promise that is resolved when the task completes successfully, or is rejected if an exception occurs. you can use the yield operator inside the generator function to wait on a promise, spawn another task, or propagate a value: let resolutionvalue = yield (promise/generator/iterator/value); if you specify a promise, the yield operator returns its resolution value as soon as the promise is resolved. if the promise is rejected, its rejection reason is thrown as an exception. if you specify a generator function or the iterator returned by a generator function, then task.spawn() is implicitly called, and the yield operator works on the returned promise. this reduces the syntax overhead of calling task.spawn() explicitly when you want to...
...ecify a generator function or the iterator returned by a generator function, then task.spawn() is implicitly called, and the yield operator works on the returned promise. this reduces the syntax overhead of calling task.spawn() explicitly when you want to recurse into other task functions. if you specify a function that is not a generator, it is called with no arguments, and the yield operator returns the return value of the function. this comes in handy when iterating over function lists where some items have been converted to tasks and some not. if you specify anything else, the yield operator returns exactly what you specified. method overview function async(atask); promise spawn(atask); properties attribute type description result rea...
...And 12 more matches

nsIWindowMediator
the value of inbelow will be ignored for zleveltop and zlevelbottom.) inbelow if inposition is set to zlevelbelow, the window below which inwindow wants to be placed. otherwise this variable is ignored. outposition constrained position, values like inposition. outbelow the window below which inwindow should be placed, if outposition equals zlevelbelow. otherwise this value will be null. return value pr_true if the position returned is different from the position given. getenumerator() return an enumerator which iterates over all windows of type awindowtype from the oldest window to the youngest. nsisimpleenumerator getenumerator( in wstring awindowtype ); parameters awindowtype the returned enumerator will enumerate only windows of this type. ("type" is the |windowtype| att...
...tenumerator() return an enumerator which iterates over all windows of type awindowtype from the oldest window to the youngest. nsisimpleenumerator getenumerator( in wstring awindowtype ); parameters awindowtype the returned enumerator will enumerate only windows of this type. ("type" is the |windowtype| attribute of the xml <window> element.) if null, all windows will be enumerated. return value an enumerator of nsidomwindows. getmostrecentwindow() this is a shortcut for simply fetching the first window in front to back order. nsidomwindow getmostrecentwindow( in wstring awindowtype ); parameters awindowtype return the topmost window of this type. ...
...ull, all windows will be enumerated. return value an enumerator of nsidomwindows. getmostrecentwindow() this is a shortcut for simply fetching the first window in front to back order. nsidomwindow getmostrecentwindow( in wstring awindowtype ); parameters awindowtype return the topmost window of this type. ("type" is the |windowtype| attribute of the xml <window> element.) if null, return the topmost window of any type. return value the topmost window. note: starting in gecko 8.0, the returned value is an nsidomwindow; previously, it was an nsidomwindowinternal. you may need to update your code or recompile binary components, if they use this method. getouterwindowwithid() return the outer window with the given id, if any. nsidomwindow getouterwindowwithid( in unsigned ...
...And 12 more matches

nsIXPCScriptable
js/src/xpconnect/idl/nsixpcscriptable.idlnot scriptable please add a summary to this article. ...
... js/src/xpconnect/idl/nsixpcscriptable.idlnot scriptable please add a summary to this article. ...
...fo_interfaces_only 1 << 23 allow_prop_mods_during_resolve 1 << 24 allow_prop_mods_to_prototype 1 << 25 dont_share_prototype 1 << 26 dont_reflect_interface_names 1 << 27 want_equality 1 << 28 want_outer_object 1 << 29 want_inner_object 1 << 30 reserved 1 << 31 the high order bit is reserved for consumers of these flags. no implementor of this interface should ever return flags with this bit set. methods precreate() void precreate( in nsisupports nativeobj, in jscontextptr cx, in jsobjectptr globalobj, out jsobjectptr parentobj ); parameters nativeobj cx globalobj parentobj create() void create( in nsixpconnectwrappednative wrapper, in jscontextptr cx, in jsobjectptr obj ); parameters wrapper cx obj postcreate() ...
...And 12 more matches

Microdata DOM API - Web APIs
and removed from all browsers and are therefore deprecated. you can't use them anymore and this document is kept as information only. microdata becomes even more useful when scripts can use it to expose information to the user, for example offering it in a form that can be used by other applications. the document.getitems(typenames) method provides access to the top-level microdata items. it returns a nodelist containing the items with the specified types, or all types if no argument is specified. each item is represented in the dom by the element on which the relevant itemscope attribute is found. these elements have their element.itemscope idl attribute set to true. the type(s) of items can be obtained using the element.itemtype idl attribute on the element with the itemscope attribute. ...
...ecified types, or all types if no argument is specified. each item is represented in the dom by the element on which the relevant itemscope attribute is found. these elements have their element.itemscope idl attribute set to true. the type(s) of items can be obtained using the element.itemtype idl attribute on the element with the itemscope attribute. methods document . getitems( [ types ] ) returns a nodelist of the elements in the document that create items, that are not part of other items, and that are of the types given in the argument, if any are listed. the types argument is interpreted as a space-separated list of types. the document.getitems(typenames) method takes a string that contains an unordered set of unique space-separated tokens that are case-sensitive, representing types...
...he document that create items, that are not part of other items, and that are of the types given in the argument, if any are listed. the types argument is interpreted as a space-separated list of types. the document.getitems(typenames) method takes a string that contains an unordered set of unique space-separated tokens that are case-sensitive, representing types. ...
...And 12 more matches

Movement, orientation, and motion: A WebXR example - Web APIs
for references to the <div> elements into which we'll output the matrices when we want to show them to the user. logging errors a function called logglerror() is implemented to provide an easily customized way to output logging information for errors that occur while executing webgl functions. function logglerror(where) { let err = gl.geterror(); if (err) { console.error(`webgl error returned by ${where}: ${err}`); } } this takes as its only input a string, where, which is used to indicate what part of the program generated the error, since similar errors can have in multiple situations. the vertex and fragment shaders the vertex and fragment shaders are both exactly the same as those used in the example for our article lighting in webgl. refer to that if you're interested in ...
...he example for our article lighting in webgl. refer to that if you're interested in the glsl source code for the basic shaders used here. suffice it to say that the vertex shader computes the position of each vertex given the initial positions of each vertex and the transforms that need to be applied to convert them to simulate the viewer's current position and orientation. the fragment shader returns the color of each vertex, interpolating as needed from the values found in the texture and applying the lighting effects. starting up and shutting down webxr upon initially loading the script, we install a handler for the load event, so that we can perform initialization. window.addeventlistener("load", onload); function onload() { xrbutton = document.queryselector("#enter-xr"); xrbutton...
...out process manually in this situation. starting up the webxr session the sessionstarted() function handles actually setting up and starting the session, by setting up event handlers, compiling and installing the glsl code for the vertex and fragment shaders, and attaching the webgl layer to the webxr session before kicking off the rendering loop. it gets called as the handler for the promise returned by issessionsupported(). function sessionstarted(session) { let refspacetype; xrsession = session; xrbutton.innertext = "exit webxr"; xrsession.addeventlistener("end", sessionended); let canvas = document.queryselector("canvas"); gl = canvas.getcontext("webgl", { xrcompatible: true }); if (allowmouserotation) { canvas.addeventlistener("pointermove", handlepointermove); ...
...And 12 more matches

Using the Web Speech API - Web APIs
echanisms. this article provides a simple introduction to both areas, along with demos. speech recognition speech recognition involves receiving speech through a device's microphone, which is then checked by a speech recognition service against a list of grammar (basically, the vocabulary you want to have recognised in a particular app.) when a word or phrase is successfully recognised, it is returned as a result (or list of results) as a text string, and further actions can be initiated as a result. the web speech api has a main controller interface for this — speechrecognition — plus a number of closely-related interfaces for representing grammar, results, etc. generally, the default speech recognition system available on the device will be used for the speech recognition — most mod...
...tion instance before we move on: speechrecognition.continuous: controls whether continuous results are captured (true), or just a single result each time recognition is started (false). speechrecognition.lang: sets the language of the recognition. setting this is good practice, and therefore recommended. speechrecognition.interimresults: defines whether the speech recognition system should return interim results, or just final results. final results are good enough for this simple demo. speechrecognition.maxalternatives: sets the number of alternative potential matches that should be returned per result. this can sometimes be useful, say if a result is not completely clear and you want to display a list if alternatives for the user to choose the correct one from. but it is not needed for...
...result is received: recognition.onresult = function(event) { var color = event.results[0][0].transcript; diagnostic.textcontent = 'result received: ' + color + '.'; bg.style.backgroundcolor = color; console.log('confidence: ' + event.results[0][0].confidence); } the second line here is a bit complex-looking, so let's explain it step by step. the speechrecognitionevent.results property returns a speechrecognitionresultlist object containing speechrecognitionresult objects. it has a getter so it can be accessed like an array — so the first [0] returns the speechrecognitionresult at position 0. each speechrecognitionresult object contains speechrecognitionalternative objects that contain individual recognised words. these also have getters so they can be accessed like arrays — the s...
...And 12 more matches

Array.prototype.map() - JavaScript
results of calling a provided function on every element in the calling array. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax let new_array = arr.map(function callback( currentvalue[, index[, array]]) { // return element for new_array }[, thisarg]) parameters callback function that is called for every element of arr. each time callback executes, the returned value is added to new_array. the callback function accepts the following arguments: currentvalue the current element being processed in the array. indexoptional the index of the current element being processed in the array. arra...
... description map calls a provided callback function once for each element in an array, in order, and constructs a new array from the results. callback is invoked only for indexes of the array which have assigned values (including undefined). ...
...nstructs a new array from the results. callback is invoked only for indexes of the array which have assigned values (including undefined). it is not called for missing elements of the array; that is: indexes that have never been set; which have been deleted; or which have never been assigned a value. when not to use map() since map builds a new array, using it when you aren't using the returned array is an anti-pattern; use foreach or for-of instead. you shouldn't be using map if: you're not using the array it returns; and/or you're not returning a value from the callback. parameters in detail callback is invoked with three arguments: the value of the element, the index of the element, and the array object being mapped. if a thisarg parameter is provided, it will be used as c...
...And 12 more matches

Array - JavaScript
console.log(vegetables) // ["cabbage", "carrot"] (the original arra...
...x of an item in the array fruits.push('mango') // ["strawberry", "banana", "mango"] let pos = fruits.indexof('banana') // 1 remove an item by index position let removeditem = fruits.splice(pos, 1) // this is how to remove an item // ["strawberry", "mango"] remove items from an index position let vegetables = ['cabbage', 'turnip', 'radish', 'carrot'] console.log(vegetables) // ["cabbage", "turnip", "radish", "carrot"] let pos = 1 let n = 2 let removeditems = vegetables.splice(pos, n) // this is how to remove items, n defines the number of items to be removed, // starting at the index position specified by pos and progressing toward the end of array. console.log(vegetables) // ["cabbage", "carrot"] (the original array is changed) console.log(removeditems) // ["turnip", "radish"] co...
...onsole.log(removeditems) // ["turnip", "radish"] copy an array let shallowcopy = fruits.slice() // this is how to make a copy // ["strawberry", "mango"] accessing array elements javascript arrays are zero-indexed. the first element of an array is at index 0, and the last element is at the index value equal to the value of the array's length property minus 1. using an invalid index number returns undefined. let arr = ['this is the first element', 'this is the second element', 'this is the last element'] console.log(arr[0]) // logs 'this is the first element' console.log(arr[1]) // logs 'this is the second element' console.log(arr[arr.length - 1]) // logs 'this is the last element' array elements are object properties in the same way that tostring is a propert...
...And 12 more matches

Object.defineProperty() - JavaScript
the static method object.defineproperty() defines a new property directly on an object, or modifies an existing property on an object, and returns the object. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax object.defineproperty(obj, prop, descriptor) parameters obj the object on which to define the property. prop the name or symbol of the property to be defined or modified. descriptor the descriptor for the property being defined or modified. return value the object that was passed to the function. description this method allows a precise addition to or modification of a property on an object.
...false. an accessor descriptor also has the following optional keys: get a function which serves as a getter for the property, or undefined if there is no getter. when the property is accessed, this function is called without arguments and with this set to the object through which the property is accessed (this may not be the object on which the property is defined due to inheritance). the return value will be used as the value of the property. defaults to undefined. set a function which serves as a setter for the property, or undefined if there is no setter. when the property is assigned, this function is called with one argument (the value being assigned to the property) and with this set to the object through which the property is assigned. defaults to undefined. if a descriptor ...
...and ... object.defineproperty(obj, 'key', withvalue('static')); // if freeze is available, prevents adding or // removing the object prototype properties // (value, get, set, enumerable, writable, configurable) (object.freeze || object)(object.prototype); examples if you want to see how to use the object.defineproperty method with a binary-flags-like syntax, see additional example...
...And 12 more matches

Creating Reusable Modules - Archive of obsolete content
ptforfile() { const nsifilepicker = ci.nsifilepicker; var fp = cc["@mozilla.org/filepicker;1"] .createinstance(nsifilepicker); var window = require("sdk/window/utils").getmostrecentbrowserwindow(); fp.init(window, "select a file", nsifilepicker.modeopen); fp.appendfilters(nsifilepicker.filterall | nsifilepicker.filtertext); var rv = fp.show(); if (rv == nsifilepicker.returnok || rv == nsifilepicker.returnreplace) { var file = fp.file; // get the path as string. note that you usually won't // need to work with the string paths. var path = fp.file.path; // work with returned nsilocalfile... } return path; } hash function firefox has built-in support for hash functions, exposed via the nsicryptohash xpcom interface the documentation page for t...
.... var path = fp.file.path; // work with returned nsilocalfile... } return path; } hash function firefox has built-in support for hash functions, exposed via the nsicryptohash xpcom interface the documentation page for that interface includes an example of calculating an md5 hash of a file's contents, given its path. ...
...n path; } hash function firefox has built-in support for hash functions, exposed via the nsicryptohash xpcom interface the documentation page for that interface includes an example of calculating an md5 hash of a file's contents, given its path. ...
...And 11 more matches

Promises - Archive of obsolete content
it is also available for use off-main-thread in workers as a synchron...
...es should be avoided, even in their asynchronous forms, due to their performance penalties and needless complexity. representative example usage components.utils.import("resource://gre/modules/osfile.jsm"); task.spawn(function* () { // retrieve file metadata to check modification time. let info = yield os.file.stat(configpath); if (info.lastmodificationdate <= timestamp) return; timestamp = info.lastmodificationdate; // read the file as a utf-8 string, parse as json. let config = json.parse( yield os.file.read(configpath, { encoding: "utf-8" })); let files = []; // get the directory contents from a list of directories. for (let dir of config.directories) { // iterate over the contents of the directory. let iter = new os...
...ure to do this will prevent firefox from shutting down // cleanly. yield db.close(); } }); promise wrappers and helpers the following are some example promise-based wrappers for common callback-based asynchronous apis. ...
...And 11 more matches

Obsolete: XPCOM-based scripting for NPAPI plugins - Archive of obsolete content
as to help you make your netscape communicator 4.x plugins exposed to javascript in mozilla based browsers. in order to make it still possible to script plugins, some changes have been made to the mozilla code. the changes allow to make existing 4.x plugins scriptable with only minor modifications in their code. the present document describes the steps of what should be done to the plugin code to turn it scriptable again. what's in the mozilla code? a couple of lines have been added to the dom code asking a plugin to return a scriptable iid and a pointer to a scriptable instance object. the old plugin api call npp_getvalue is used to retrieve this information from the plugin. so the plugin project should be aware of two new additions to nppvariable enumeration type which are now defined in npa...
... necessary nsiclassinfo method stubs // and to set flags used by the security system class nsclassinfomixin : public nsiclassinfo { // these flags are used by the dom and security systems to signal that // javascript callers are allowed to call this object's scritable methods. ...
...the dom and security systems to signal that // javascript callers are allowed to call this object's scritable methods. ns_imethod getflags(pruint32 *aflags) {*aflags = nsiclassinfo::plugin_object | nsiclassinfo::dom_object; return ns_ok;} ns_imethod getimplementationlanguage(pruint32 *aimplementationlanguage) {*aimplementationlanguage = nsiprogramminglanguage::cplusplus; return ns_ok;} // the rest of the methods can safely return error codes... ...
...And 11 more matches

Client-Server Overview - Learn web development
browser with an http response message. the response contains an http response status code indicating whether or not the request succeeded (e.g. "200 ok" for success, "404 not found" if the resource cannot be found, "403 forbidden" if the user isn't authorised to see the resource, etc). the body of a successful response to a get request would contain the requested resource. when an html page is returned it is rendered by the web browser. as part of processing the browser may discover links to other resources (e.g. an html page usually references javascript and css pages), and will send separate http requests to download these files. both static and dynamic websites (discussed in the following sections) use exactly the same communication protocol/patterns. get request/response example you ca...
...line includes the response code 200 ok, which tells us that the request succeeded. we can see that the response is text/html formatted (content-type). we can also see that it uses the utf-8 character set (content-type: text/html; charset=utf-8). the head also tells us how big it is (content-length: 41823). at the end of the message we see the body content — which contains the actual html returned by the request. http/1.1 200 ok server: apache x-backend-server: developer1.webapp.scl3.mozilla.com vary: accept,cookie, accept-encoding content-type: text/html; charset=utf-8 date: wed, 07 sep 2016 00:11:31 gmt keep-alive: timeout=5, max=999 connection: keep-alive x-frame-options: deny allow: get x-cache-info: caching content-length: 41823 <!doctype html> <html lang="en-us" dir="ltr" class...
... using web sniffers (e.g. websniffer) or browser extensions like httpfox. you can try this yourself. use any of the linked tools, and then navigate through a site and edit profile information to see the different requests and responses. most modern browsers also have tools that monitor network requests (for example, the network monitor tool in firefox). static sites a static site is one that returns the same hard coded content from the server whenever a particular resource is requested. so for example if you have a page about a product at /static/myproduct1.html, this same page will be returned to every user. if you add another similar product to your site you will need to add another page (e.g. myproduct2.html) and so on. this can start to get really inefficient — what happens when you g...
...And 11 more matches

Handling common accessibility problems - Learn web development
prerequisites: familiarity with the core html, css, and javascript languages; an idea of the high level principles of cross browser testing. objective: to be able to diagnose common accessibility problems, and use appropriate tools and techniques to fix them. ...
...t. i'd love people to be able to find this content!</p> <h2>my 2nd subheading</h2> <p>this is the second subsection of my content. i think it is more interesting than the last one.</p> in addition, your content should make logical sense in its source order — you can always place it where you want using css later on, but you should get the source order right to start with. as a test, you can turn off a site's css and see how understandable it is without it. you could do this manually by just removing the css from your code, but the easiest way is to use browser features, for example: firefox: select view > page style > no style from the main menu. safari: select develop > disable styles from the main menu (to enable the develop menu, choose safari > preferences > advanced > show devel...
...html example (see the source code) — open this in a new tab, and try pressing the tab key; after a few presses, you should see the tab focus start to move through the different focusable elements; the focused elements are given a highlighted default style in every browser (it differs slightly between different browsers) so that you can tell what element is focused. you can then press enter/return to follow a focused link or press a button (we've included some javascript to make the buttons alert a message), or start typing to enter text in a text input (other form elements have different controls, for example the <select> element can have its options displayed and cycled between using the up and down arrow keys). note that different browsers may have different keyboard control options av...
...And 11 more matches

Promise
once you have a reference to a promise, you can call its then() method to execute an action when the value becomes available, or when an error occurs. promises may also be created using the new promise() constructor. you don't need to import the promise.jsm module to use a promise object to which you already have a reference. ...
...ways handle, forward, or report errors (rejection reasons). if you see the message "a promise chain failed to handle a rejection", there is likely something to be fixed in the code. see handling errors and common pitfalls below. documentation conventions in documentation, the type of the fulfillment value is usually specified between angular brackets. for example, the os.file.exists function returns a promise that will eventually fulfill with a boolean: promise<boolean> exists(string path); the rejection reason may be specified separately in the function's documentation, and is considered to be an error object unless otherwise specified. method overview promise then([optional] function onfulfill, [optional] function onreject); promise catch([optional] function onrejec...
...catch([optional] function onreject); constructor creates a new promise, initially in the pending state, and provides references to the resolving functions that can be used to change its state. new promise(executor); parameters executor this function is invoked immediately with the resolving functions as its two arguments: executor(resolve, reject); the constructor will not return until the executor has completed. the resolving functions can be used at any time, before or after the executor has completed, to control the final state of the promise. if the executor throws an exception, its value will be passed to the reject resolving function. resolving functions resolve() fulfills the associated promise with the specified value, or propagates the state of an existing ...
...And 11 more matches

PromiseWorker.jsm
summary a promiseworker is a chromeworker except instead of calling postmessage() to send a message, you call post(), which returns a promise. javascript files imported into the worker scope and main thread scope which allows posting to the worker and receiving in the form of a promise. like chromeworker objects, promiseworker is mostly used for js-ctypes but it is not limited to that. there is no xpcom access, similar to chromeworker. this answers the question "when should i use a promiseworker?", and the answer is, whenever you would normally use a chromeworker, but want postmessage to return promises. the promiseworker object is used to deliver all of the os.file functionality to the main thread. here is the test case from firefox codebase: mozilla dxr :: test_promise.js. promiseworker ...
... in. the code below is what should be copied and pasted: importscripts('resource://gre/modules/workers/require.js'); let promiseworker = require('resource://gre/modules/workers/promiseworker.js'); // instantiate abstractworker (see below). let worker = new promiseworker.abstractworker() worker.dispatch = function(method, args = []) { // dispatch a call to method `method` with args `args` return self[method](...args); }; worker.postmessage = function(...args) { // post a message to the main thread self.postmessage(...args); }; worker.close = function() { // close the worker self.close(); }; worker.log = function(...args) { // log (or discard) messages (optional) dump('worker: ' + args.join(' ') + '\n'); }; // connect it to message port. self.addeventlistener('message', msg =...
...objects to transfer ownership of. if the ownership of an object is transferred, it becomes unusable (neutered) in the context it was sent from, and it becomes available only to the worker it was sent to. only messageport and arraybuffer objects can be transferred. to learn more on how to achieve this see the section in this article titled transferring special data from main thread to worker. returns a promise object. transferring special data from main thread to worker the regular rules of workers apply; special data of messageport and arraybuffer objects can be transferred as of firefox 40. there are two ways to transfer data. the first is with atransferlist argument and other with basepromiseworker.meta. both are done by the post function described above. atransferlist to transfer an...
...And 11 more matches

Mozilla DOM Hacking Guide
a jsfunction, a jsobject, a jsval, ... this means that when we use the dom from javascript, we pass arguments that have no type. however, since the dom is coded in c++, we expect to receive an argument of the correct type for our function. this is one of the jobs of xpconnect. xpconnect will "wrap" the argument in a wrapper that will be of the type expected by our c++ function. similarly, then return type of the c++ function will be wrapped by xpconnect so that javascript can use it safely. when, in javascript, a client tries to access a dom object or a dom method on a dom object, the js engine asks xpconnect to search for the relevant c++ method to call. for example, when we ask for |document.getelementbyid("myid");|, xpconnect will find that |document| is a property of the window object, s...
...hen, in javascript, a client tries to access a dom object or a dom method on a dom object, the js engine asks xpconnect to search for the relevant c++ method to call. for example, when we ask for |document.getelementbyid("myid");|, xpconnect will find that |document| is a property of the window object, so it will look on the interface nsidomwindow, and it will find the getdocument() method. the return value of getdocument() is a nsidomdocument. so xpconnect will then try to find a method named getelementbyid() on the nsidomdocument interface. and indeed it will find it, and thus call it. this is the schema used most of the time when using w3c dom objects and methods. it is however different for some dom level 0 objects and methods. i'll take two very different examples. the first one is the w...
... of. let's begin with the public interface. constructor: it is called for each created helper class through the member initialization list. it simply initializes the mid data member with the aid argument. the nsixpcscriptable, nsisupports, and nsiclassinfo member functions, declared with ns_decl_x macros. static nsiclassinfo* getclassinfoinstance(nsdomclassinfoid aid): this helper method returns a non-refcounted nsiclassinfo pointer to an instance of the helper class corresponding to the id passed in. the implementation is detailed in section 1.6. static nsiclassinfo* getclassinfoinstance(nsdomclassinfodata* adata);: this helper method returns a non-refcounted nsiclassinfo pointer to an instance of the helper class corresponding to the data passed in. the implementation is detailed i...
...And 11 more matches

Secure Development Guidelines
ointer (eip) points to register being executed; can’t be modified directly introduction: gaining control (2) eip is modified using call or jump instructions attacks usually rely on obtaining control over the eip otherwise the attacker can try to control memory pointed to by an existing function pointer a vulnerability is required to modify the eip or sensitive memory saved return addr or function pointer get altered introduction: gaining control (3) common issues used to gain control buffer overflows format string bugs integer overflows/underflows writing secure code: input validation input validation most vulnerabilities are a result of un-validated input always perform input validation could save you without knowing it examples: if i...
... with a sql string sql is a language used to interact with databases code injection attack that is similar to xss but targeted at sql rather than html and javascript if input is mixed with sql, it could itself become an sql instruction and be used to: query data from the database (passwords) insert value into the database (a user account) change application logic based on results returned by the database sql injection: example snprintf(str, sizeof(str), "select * from account where name ='%s'", name); sqlite3_exec(db, str, null, null, null); sql injection: prevention use parameterized queries insert a marker for every piece of dynamic content so data does not get mixed with sql instructions example: sqlite3_stmt *stmt; char *str = "select * from acco...
...short -32768 - +32767 unsigned short 0 - +65535 32 signed int -2147483648 - +2147483647 unsigned int 0 - +4294967295 64 signed long long -9223372036854775808 - +9223372036854775807 unsigned long long 0 - +18446744073709551615 int vuln_funct(int size) { char buf[1024]; if (size > sizeof(buf) - 1) return -1; } signedness issues: don’t mix signed and unsigned integers use unsigned integers for sizes, offsets, and indexes casting and truncation example: void vuln_funct() { u_int32_t size1 = 0xffffffff; u_int16_t size2 = size1; void *ptr = malloc(size2); if (!ptr) exit(exit_failure); memcpy(ptr, user_data, size1); } casting issues: sign extension exampl...
...And 11 more matches

XPCOM array guide
mponentmanager.createinstance() and the contract id "@mozilla.org/array;1". the created array implements nsimutablearray and nsiarray. since nsimutablearray derives from nsiarray, the resulting array can be cast to a read-only array. c++ example void getlist(nsiarray** aresult) { nscomptr<nsimutablearray> array = do_createinstance(ns_array_contractid); // append some elements ... ...
...access to specific elements is through queryelementat, which is similar to queryinterface, but it takes a specific index. ...
...access to specific elements is through queryelementat, which is similar to queryinterface, but it takes a specific index. ...
...And 11 more matches

Mozilla internal string guide
avoided. iterators because mozilla strings are always a single buffer, iteration over the characters in the string is done using raw pointers: /** * find whether there is a tab character in `data` */ bool hastab(const nsastring& data) { const char16_t* cur = data.beginreading(); const char16_t* end = data.endreading(); for (; cur < end; ++cur) { if (char16_t('\t') == *cur) return true; } return false; } note that `end` points to the character after the end of the string buffer. it should never be dereferenced. writing to a mutable string is also simple: /** * replace every tab character in `data` with a space. */ void replacetabs(nsastring& data) { char16_t* cur = data.beginwriting(); char16_t* end = data.endwriting(); for (; cur < end; ++cur) { if (ch...
...) takes four arguments: the new capacity (which may be rounded up), the number of code units at the beginning of the string to preserve (typically the old logical length), a boolean indicating whether reallocating a smaller buffer is ok if the requested capacity would fit in a buffer that's smaller than current one, and a reference to an nsresult for indicating failure on oom. (don't access the return value if the nsresult indicates failure. unfortunately mozilla::result is not versatile enough to be used here.) bulkwrite() returns a mozilla::bulkwritehandle<t>, where t is either char or char16_t. the actual writes are performed through this handle. you must not access the string except via the handle until you call finish() on the handle in the success case or you let the handle go out of sc...
...ngth of the buffer. the buffer exposed via these methods includes the prefix that you may have requested to be preserved. it's up to you to skip past it so as to not overwrite it. if there's a need to request a different capacity before you are ready to call finish(), you can call restartbulkwrite() on the handle. it takes three arguments that match the first three arguments of bulkwrite(). it returns mozilla::result<mozilla::ok, nsresult> to indicate success or oom. calling restartbulkwrite() invalidates previously-obtained span, raw pointer or length. once you are done writing, call finish(). it takes two arguments: the new logical length of the string (which must not exceed the capacity retuned by the length() method of the handle) and a boolean indicating whether it's ok to attempt to re...
...And 11 more matches

NS_ConvertUTF16toUTF8
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 11 more matches

NS_LossyConvertUTF16toASCII
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 11 more matches

nsAdoptingCString
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 11 more matches

nsCAutoString
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. ...
...d print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
...- source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 11 more matches

nsCString
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 11 more matches

nsDependentCString
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 11 more matches

nsFixedCString
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 11 more matches

nsPromiseFlatCString
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 11 more matches

nsXPIDLCString
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 11 more matches

imgIContainer
frameindex unsigned long the index of the current frame that would be drawn if the image was to be drawn now. read only. obsolete since gecko 2.0 currentframeisopaque boolean whether the current frame is opaque; that is, needs the background painted behind it. read only. height print32 the height of the container rectangle. in the case of any error, zero is returned, and an exception will be thrown. read only. loopcount long number of times to loop the image. note: -1 means forever. obsolete since gecko 2.0 numframes unsigned long the total number of frames in this image. read only. obsolete since gecko 2.0 preferredalphachannelformat gfx_format read only. obsolete since gecko 1.9.2 type uns...
...es unsigned long the total number of frames in this image. read only. obsolete since gecko 2.0 preferredalphachannelformat gfx_format read only. obsolete since gecko 1.9.2 type unsigned short the type of this image (one of the type_* values above). read only. width print32 the width of the container rectangle. in the case of any error, zero is returned, and an exception will be thrown. read only. constants constant value description type_raster 0 enumerated values for the 'type' attribute (below). type_vector 1 flag_none 0x0 flags for imgicontainer operations. meanings: flag_none: lack of flags. flag_sync_decode: forces synchronous/non-progressive decode of a...
... read only. constants constant value description type_raster 0 enumerated values for the 'type' attribute (below). type_vector 1 flag_none 0x0 flags for imgicontainer operations. meanings: flag_none: lack of flags. flag_sync_decode: forces synchronous/non-progressive decode of all available data before the call returns. it is an error to pass this flag from a call stack that originates in a decoder (that is, from a decoder observer event). flag_decode_no_premultiply_alpha: do not premultiply alpha if it is not already premultiplied in the image data. flag_decode_no_colorspace_conversion: do not do any colorspace conversion; ignore any embedded profiles, and do not convert to any particular destination ...
...And 11 more matches

inIDOMUtils
onstant value description exclude_shorthands (1<<0) include_aliases (1<<1) content state flags the content state flags are used in a bitmask. ...
...:active 2 :focus 4 :hover 8 :-moz-drag-over 16 :target 1<<29 :-moz-focusring methods getbindingurls() returns an array of nsiuri objects representing the current xml binding for the specified element. nsiarray getbindingurls( in nsidomelement aelement ); parameters aelement a dom element to retrieve the bindings of. return value an array of nsiuri objects representing the current xbl binding (if any) for the element and its hierarchy of base bindings. getchildrenfornode() returns a list of dom nodes that are children of the specified node. nsidomnodelist getchildrenfornode( in nsidomnode anode, in boolean ashowinganonymouscontent ); parameters anode a dom node for which to retrieve the style nodes. a...
...r the element and its hierarchy of base bindings. getchildrenfornode() returns a list of dom nodes that are children of the specified node. nsidomnodelist getchildrenfornode( in nsidomnode anode, in boolean ashowinganonymouscontent ); parameters anode a dom node for which to retrieve the style nodes. ashowinganonymouscontent whether you are interested in the xbl flattened tree. return value a dom nodelist of the child nodes. if you have requested anonymous content, then if the element has an xbl binding then this will be the binding's anonymous nodes, otherwise if the element is itself an anonymous node containing an insertion point then this will be a list combining the element's explicit children from its binding parent's anonymous nodes and any children inserted as a resul...
...And 11 more matches

nsIAccessibleText
ng endindex, in unsigned long coordinatetype, in long x, in long y); void setselectionbounds(in long selectionnum, in long startoffset, in long endoffset); attributes attribute type description caretoffset long the current current caret offset. if set < 0 then caret will be placed at the end of the text. charactercount long read only. defaulttextattributes nsipersistentproperties return the text attributes that apply to the entire accessible. read only. selectioncount long read only. constants text offset constants constant value description text_offset_end_of_text -1 will be treated as the equal to the end of the text. text_offset_caret -2 will be treated as the caret position. text boundary constants constant value description boundary_char 0 boundary...
...e description coord_type_screen 0 coord_type_window 1 methods addselection() void addselection( in long startoffset, in long endoffset ); parameters startoffset endoffset getattributerange() obsolete since gecko 1.9.1 (firefox 3.5 / thunderbird 3.0 / seamonkey 2.0) get the accessible and start/end offsets around the given offset. this accessible get return the dom node and layout frame with the uniform attributes for this range of text. nsiaccessible getattributerange( in long offset, out long rangestartoffset, out long rangeendoffset ); parameters offset rangestartoffset rangeendoffset return value getcharacteratoffset() it would be better to return an unsigned long here, to allow unicode chars > 16 bits. wchar getcharacteratoffset( ...
...form attributes for this range of text. nsiaccessible getattributerange( in long offset, out long rangestartoffset, out long rangeendoffset ); parameters offset rangestartoffset rangeendoffset return value getcharacteratoffset() it would be better to return an unsigned long here, to allow unicode chars > 16 bits. wchar getcharacteratoffset( in long offset ); parameters offset return value getcharacterextents() returns the bounding box of the specified position. the virtual character after the last character of the represented text, that is the one at position length is a special case. it represents the current input position and will therefore typically be queried by at more often than other positions. because it does not represent an existing character its bounding box is ...
...And 11 more matches

nsIFile
each element in the enumeration is an nsifile. read only. exceptions thrown ns_error_file_not_directory indicates that this nsifile does not reference a directory. diskspaceavailable print64 the number of bytes available to non-superuser on the disk volume containing the nsifile. read only. filesi...
...ute is a platform-specific file path. read only. native code only! nativetarget acstring this attribute exposes the full target of the nsifile - the full path with any symbolic links dereferenced. [native character encoding variant] the value of this attribute is a platform-specific file path. read only. ...
... changing the permissions of a nsifile operates on the underlying filesystem. ...
...And 11 more matches

Getting Started Guide
unt goes to zero, the interface may delete itself. clients are expected to keep this reference count accurate by incrementing it when they acquire a reference to the interface, and decrementing it before they let go. to facilitate this, all interfaces inherit from an abstract base class that provides the member functions addref, and release. a rule of xpcom is that any function that creates or returns an interface pointer will have already addrefed it. the caller can then hold onto the reference indefinitely, calling release when it no longer needs it. when the last pointer to an interface is released, the interface (and consequently, typically the underlying object) will delete itself. as long as there is an outstanding addref against the interface, it continues to exist. if you forget to ca...
...rison 1, below). you don't need an owning reference when the object is passed in as a parameter, and you don't need to keep it any longer than the scope of this function; the object's lifetime is known to contain yours in some well defined way, e.g., in the nodes of a tree, parent nodes keep owning references to their children, children need not keep owning references to their parents. it turns out that reference counting by hand is hard for programmers to get right. it may sound simple, but in practice it's very easy to forget to release at the appropriate moment. or to addref too many or too few times. how does nscomptr help? nscomptr manages addref, release, and other red-tape for you. an nscomptr looks and acts as much like a raw xpcom interface pointer as c allows, but it knows ...
...uctor to ensure that mfooptr is initially set to null (or some other reasonable value). nscomptr helps you write code that is leak-proof, exception safe, and significantly less verbose than you would with raw xpcom interface pointers. with nscomptr, you may never have to call addref, release, or queryinterface by hand. you still have to understand xpcom. you still have to know which functions return interface pointers that have already been addrefed and which don't. you still have to ensure your program logic doesn't produce circularly referencing garbage. nscomptr is not a panacea. it is, however, helpful, easy to use, well-tested, and polite. it doesn't require that a function author cooperate with you, nor does your use force others to use it. using nscomptr the basics in most cases, y...
...And 11 more matches

Reference Manual
any, and addref the new. at its own destructor time it must release as well. nscomptr only does exactly the work you would have done, if you always remembered to do the right thing. safety features type safeguards it is an invariant of nscomptr that it holds the xpcom-correct interface pointer for it's underlying type. for example, an nscomptr<nsifoo> will always hold the pointer that would be returned by queryinterface, when querying an xpcom object for its nsifoo interface. in debug builds, if you subvert this invariant with one of the assignment forms that doesn't call queryinterface, nscomptr will assert at runtime in the bad assignment. // given two un-related interfaces |nsifoo| and |nsibar|... nsibar* bar = ...; // ... nscomptr<nsifoo> foo = bar; // ns_asser...
...foo> foo; // note: default initialized to |0| foo->dosomething(); // ns_precondition: "you can't dereference a null nscomptr with operator->()" a similar precondition intervenes on behalf of operator*. reference-counting safeguards all of the operations that extract the underlying raw pointer out of an nscomptr use a c trick to implement another safety feature. the pointer returned cannot be addrefed, released, or deleted. nscomptr<nsifoo> foo = ...; foo->addref(); // error: |addref| is private delete foo.get(); // error: |operator delete| is private ns_release(foo); // error: |release| is private of course, the most important safety feature provided by nscomptr is that it addrefs and releases automatically at the appropria...
...ove, illegal by making operator& private. see bug 59414. implementation details and debugging machinery although it is a class, nscomptr has no virtual methods, and therefore, no vtable or vptr. because a few key routines are factored out into a common non-template base class, the actual underlying pointer is stored as an nsisupports* (except in debug builds where nscap_feature_debug_ptr_types is turned on). it is because of these factored routines that nscomptr users must link with the xpcom library. when nscap_feature_debug_ptr_types is turned on, instead of holding its underlying pointer in a variable of type nsisupports*, the nscomptr holds it in a pointer matching the underlying type. this allows source level debuggers to more easily "follow" the pointer. however, the routines that would ...
...And 11 more matches

UInt64
eed) to use data represented using a 64-bit data type. you use the uint64 object to create and manipulate 64-bit unsigned integers. note: it's important to note that the 64-bit integer objects created by uint64 are not uint64 objects; rather, they're opaque objects whose values you manipulate through the other methods on the uint64 object. see 64-bit integers for details. syntax creates and returns a new 64-bit unsigned integer. uint64 uint64( value ); parameters value the value to assign the new 64-bit unsigned integer object. this may be specified as an integer (if the value can be represented as a 32-bit value), another 64-bit integer object (either signed or unsigned), or as a string, which may consist of an optional minus sign, followed by either a decimal number or "0x" or "...
...er 64-bit integer object (either signed or unsigned), or as a string, which may consist of an optional minus sign, followed by either a decimal number or "0x" or "0x" followed by a hexadecimal number. the string is then converted into the corresponding 64-bit integer value. you can therefore use a string to represent a 64-bit value that is too large to represent as a 32-bit javascript number. return value a new object representing the specified value. exceptions thrown typeerror the specified value cannot be converted into a 64-bit integer. either it's not a number, string, or 64-bit integer object, or it's a string that is incorrectly formatted or contains a value outside the range that can be represented in 64 bits. this will also be thrown if the source value is a floating-point num...
...epresented as a 64-bit integer. method overview number compare(a, b); number hi(a); uint64 join(high, low); number lo(a); string tosource(); string tostring([radix]); methods compare() compares two 64-bit integer values. number compare( a, b ); parameters a the first value to compare. b the second value to compare. return value the returned value is -1 if a < b, 0 if a == b, and 1 if a > b. exceptions thrown typeerror one or both of the specified values is not a 64-bit integer (either signed or unsigned). hi() returns the high 32 bits of the specified value. number hi( num ); parameters num the value whose high 32 bits are to be returned. return value the high 32 bits of num are returned. th...
...And 11 more matches

Background audio processing using AudioWorklet - Web APIs
ltiple modules from over the network or even the user's local disk. basic code framework the barest framework of an audio processor class looks like this: class myaudioprocessor extends audioworkletprocessor { constructor() { super(); } process(inputlist, outputlist, parameters) { /* using the inputs (or not, as needed), write the output into each of the outputs */ return true; } }; registerprocessor("my-audio-processor", myaudioprocessor); after the implementation of the processor comes a call to the global function registerprocessor(), which is only available within the scope of the audio context's audioworklet, which is the invoker of the processor script as a result of your call to audioworklet.addmodule(). this call to registerprocessor() registers your ...
...nd may in fact vary depending on circumstances, so you should always check the array's length rather than assuming a particular size. it is, however, guaranteed that the inputs and outputs will have the same block length. each input can have a number of channels. a mono input has a single channel; stereo input has two channels. surround sound might have six or more channels. so each input is, in turn, an array of channels. that is, an array of float32array objects. then, there can be multiple inputs, so the inputlist is an array of arrays of float32array objects. each input may have a different number of channels, and each channel has its own array of samples. thus, given the input list inputlist: const numberofinputs = inputlist.length; const firstinput = inputlist[0]; const firstinputch...
...the same check is performed when determining how many channels to process in the current input; we only process as many as there are room for in the destination output. this av...
...And 11 more matches

Using Web Workers - Web APIs
ction to using web workers. web workers api a worker is an object created using a constructor (e.g. worker()) that runs a named javascript file — this file contains the code that will run in the worker thread; workers run in another global context that is different from the current window. thus, using the window shortcut to get the current global scope (instead of self) within a worker will return an error. the worker context is represented by a dedicatedworkerglobalscope object in the case of dedicated workers (standard workers that are utilized by a single script; shared workers use sharedworkerglobalscope). a dedicated worker is only accessible from the script that first spawned it, whereas shared workers can be accessed from multiple scripts. note: see the web workers api landing pa...
...indexeddb. see functions and classes available to workers for more details. data is sent between workers and the main thread via a system of messages — both sides send their messages using the postmessage() method, and respond to messages via the onmessage event handler (the message is contained within the message event's data attribute.) the data is copied rather than shared. workers may, in turn, spawn new workers, as long as those workers are hosted within the same origin as the parent page. in addition, workers may use xmlhttprequest for network i/o, with the exception that the responsexml and channel attributes on xmlhttprequest always return null. dedicated workers as mentioned above, a dedicated worker is only accessible by the script that called it. in this section we'll discuss ...
... this example is rather trivial, but we decided to keep it simple while introducing you to basic worker concepts. more advanced details are covered later on in the article. ...
...And 11 more matches

Border-radius generator - CSS: Cascading Style Sheets
nput.setattribute('type', 'text'); input.addeventlistener('click', function(e) { this.select(); }); input.addeventlistener('change', function(e) { var value = parseint(e.target.value); if (isnan(value) === true) setvalue(obj.topic, obj.value); else setvalue(obj.topic, value); }); subscribe(obj.topic, function(value) { input.value = value + obj.unit; }); return input; } var slidercomponent = function slidercomponent(obj, sign) { var slider = document.createelement('div'); var startx = null; var start_value = 0; slider.addeventlistener("click", function(e) { setvalue(obj.topic, obj.value + obj.step * sign); }); slider.addeventlistener("mousedown", function(e) { startx = e.clientx; start_value = obj.value; document.body.style.
...er("mouseup", function(e) { document.removeeventlistener("mousemove", slidermotion); document.body.style.cursor = "auto"; slider.style.cursor = "pointer"; }); var slidermotion = function slidermotion(e) { slider.style.cursor = "e-resize"; var delta = (e.clientx - startx) / obj.sensivity | 0; var value = delta * obj.step + start_value; setvalue(obj.topic, value); } return slider; } var inputslider = function(node) { var min = node.getattribute('data-min') | 0; var max = node.getattribute('data-max') | 0; var step = node.getattribute('data-step') | 0; var value = node.getattribute('data-value') | 0; var topic = node.getattribute('data-topic'); var unit = node.getattribute('data-unit'); var name = node.getattribute('data-info'); var sensivity =...
...ame; node.appendchild(info); } node.appendchild(slider_left); node.appendchild(input); node.appendchild(slider_right); node.classname = 'ui-input-slider ui-input-slider-container'; this.input = input; sliders[topic] = this; setvalue(topic, value); } var setvalue = function setvalue(topic, value, send_notify) { var slider = sliders[topic]; if (slider === undefined) return; if (value > slider.max) value = slider.max; if (value < slider.min) value = slider.min; slider.value = value; slider.node.setattribute('data-value', value); if (send_notify !== undefined && send_notify === false) { slider.input.value = value + slider.unit; return; } notify.call(slider); } var setmax = function setmax(topic, value) { var slider = sliders[topic]; if ...
...And 11 more matches

Array.prototype.sort() - JavaScript
the default sort order is ascending, built upon converting the elements into strings, then comparing their sequences of utf-16 code units values. the time and space complexity of the sort cannot be guaranteed as it depends on the implementation. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax arr.sort([comparefunction]) parameters comparefunction optional specifies a function that defines the sort order. ...
...tive-examples and send us a pull request. syntax arr.sort([comparefunction]) parameters comparefunction optional specifies a function that defines the sort order. if omitted, the array elements are converted to strings, then sorted according to each character's unicode code point value. firstel the first element for comparison. secondel the second element for comparison. return value the sorted array. note that the array is sorted in place, and no copy is made. description if comparefunction is not supplied, all non-undefined array elements are sorted by converting them to strings and comparing strings in utf-16 code units order. for example, "banana" comes before "cherry". in a numeric sort, 9 comes before 80, but because numbers are converted to strings, "80" comes...
...te : in utf-16, unicode characters above \uffff are encoded as two surrogate code units, of the range \ud800-\udfff. the value of each code unit is taken separately into account for the comparison. thus the character formed by the surrogate pair \ud655\ude55 will be sorted before the character \uff3a. ...
...And 11 more matches

BigInt64Array - JavaScript
orm byte order. if control over byte order is needed, use dataview instead. the contents are initialized to 0n. once established, you can reference elements in the array using the object's methods, or by using standard array index syntax (that is, using bracket notation). constructor bigint64array() creates a new bigint64array object. static properties bigint64array.bytes_per_element returns a number value of the element size. 8 in the case of a bigint64array. bigint64array.name returns the string value of the constructor name. in the case of the bigint64array type, this is "bigint64array". static methods bigint64array.from() creates a new bigint64array from an array-like or iterable object. see also array.from(). bigint64array.of() creates a new bigint64array with a varia...
...string value of the constructor name. in the case of the bigint64array type, this is "bigint64array". static methods bigint64array.from() creates a new bigint64array from an array-like or iterable object. see also array.from(). bigint64array.of() creates a new bigint64array with a variable number of arguments. see also array.of(). ...
...es a new bigint64array from an array-like or iterable object. see also array.from(). bigint64array.of() creates a new bigint64array with a variable number of arguments. see also array.of(). instance properties bigint64array.prototype.buffer returns the arraybuffer referenced by the bigint64array. this is fixed at construction time and thus read only. bigint64array.prototype.bytelength returns the length (in bytes) of the bigint64array from the start of its arraybuffer. this is fixed at construction time and thus read only. ...
...And 11 more matches

Uint8ClampedArray - JavaScript
ead; if you specify a non-integer, the nearest integer will be set. the contents are initialized to 0. once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation). constructor uint8clampedarray() creates a new uint8clampedarray object. static properties uint8clampedarray.bytes_per_element returns a number value of the element size. 1 in the case of an uint8clampedarray. uint8clampedarray.name returns the string value of the constructor name. in the case of the uint8clampedarray type: "uint8clampedarray". static methods uint8clampedarray.from() creates a new uint8clampedarray from an array-like or iterable object. see also array.from(). uint8clampedarray.of() creates a new uint8...
...constructor name. in the case of the uint8clampedarray type: "uint8clampedarray". static methods uint8clampedarray.from() creates a new uint8clampedarray from an array-like or iterable object. see also array.from(). uint8clampedarray.of() creates a new uint8clampedarray from a variable number of arguments. see also array.of(). ...
...lampedarray from an array-like or iterable object. see also array.from(). uint8clampedarray.of() creates a new uint8clampedarray from a variable number of arguments. see also array.of(). instance properties uint8clampedarray.prototype.buffer returns the arraybuffer referenced by the uint8clampedarray fixed at construction time and thus read only. uint8clampedarray.prototype.bytelength returns the length (in bytes) of the uint8clampedarray from the start of its arraybuffer. fixed at construction time and thus read only. ...
...And 11 more matches

tooltip - Archive of obsolete content
1"/> <menuitem label="submenu2 item 2"/> </menupopup> </menu> <menupopup/> onpopuphiding type: script code this event is sent to a popup when it is about to be hidden. onpopupshowing type: script code this event is sent to a popup just before it is opened. this handler is usually used to dynamically set the contents when the user requests to display it. returning false from this event handler prevents the popup from appearing. onpopupshown type: script code this event is sent to a popup after it has been opened, much like the onload event is sent to a window when it is opened. page type: boolean setting the page attribute to true will result in the tooltip being filled automatically as appropriate for a browser content area tool...
... if both x and y have the value -1 the call will realign the popup with its anchor node. openpopup( anchor , position , x , y , iscontextmenu, attributesoverride, tr...
... if both x and y have the value -1 the call will realign the popup with its anchor node. openpopup( anchor , position , x , y , iscontextmenu, attributesoverride, triggerevent ) ...
...And 10 more matches

Index - Learn web development
e way through your javascript learning, so it's a good idea to get this out of the way now. if you are one of those people that doesn't enjoy math, you can take comfort in the fact that this chapter was pretty short. 79 handling text — strings in javascript article, beginner, codingscripting, guide, javascript, join, quotes, concatenation, l10n:priority, strings next, we'll turn our attention to strings — this is what pieces of text are called in programming. in this article, we'll look at all the common things that you really ought to know about strings when learning javascript, such as creating strings, escaping quotes in strings, and joining strings together. 80 silly story generator arrays, assessment, beginner, codingscripting, javascript, learn, nu...
... article, beginner, codingscripting, debugging, developer tools, error, javascript, learn, tutorial, console.log, l10n:priority so there we have it, the basics of figuring out errors in simple javascript programs. ...
...you've seen this stuff already in the course, but only in passing — here we'll discuss it all explicitly. ...
...And 10 more matches

A first splash into JavaScript - Learn web development
y: sans-serif; } body { width: 50%; max-width: 800px; min-width: 480px; margin: 0 auto; } .lastresult { color: white; padding: 3px; } </style> </head> <body> <h1>number guessing game</h1> <p>we have selected a random number between 1 and 100. see if you can guess it in 10 turns or fewer. we'll tell you if your guess was too high or too low.</p> <div class="form"> <label for="guessfield">enter a guess: </label><input type="text" id="guessfield" class="guessfield"> <input type="submit" value="submit guess" class="guesssubmit"> </div> <div class="resultparas"> <p class="guesses"></p> <p class="lastresult"></p> <p class="loworhi"></p> </...
....floor(math.random() * 100) + 1; } </script> </body> </html> have a go at playing it — familiarize yourself with the game before you move on. let's imagine your boss has given you the following brief for creating this game: i want you to create a simple guess the number type game. it should choose a random number between 1 and 100, then challenge the player to guess the number in 10 turns. after each turn the player should be told if they are right or wrong, and if they are wrong, whether the guess was too low or too high. it should also tell the player what numbers they previously guessed. the game will end once the player guesses correctly, or once they run out of turns. when the game ends, the player should be given an option to start playing again. upon looking at this brie...
...start it on 1. provide the player with a way to guess what the number is. once a guess has been submitted first record it somewhere so the user can see their previous guesses. next, check whether it is the correct number. if it is correct: display congratulations message. ...
...And 10 more matches

Getting started with React - Learn web development
able module that renders a part of our app. these parts can be big or small, but they are usually clearly defined: they serve a single, obvious purpose. let's open src/app.js, since our browser is prompting us to edit it. this file contains our first component, app, and a few other lines of code: import react from 'react'; import logo from './logo.svg'; import './app.css'; function app() { return ( <div classname="app"> <header classname="app-header"> <img src={logo} classname="app-logo" alt="logo" /> <p> edit <code>src/app.js</code> and save to reload. </p> <a classname="app-link" href="https://reactjs.org" target="_blank" rel="noopener noreferrer" > learn react </a> ...
..., and an export statement at the bottom. most react components follow this pattern. import statements the import statements at the top of the file allow app.js to use code that has been defined elsewhere. let's look at these statements more closely. import react from 'react'; import logo from './logo.svg'; import './app.css'; the first statement imports the react library itself. because react turns the jsx we write into react.createelement(), all react components must import the react module. if you skip this step, your application will produce an error. the second statement imports a logo from './logo.svg'. note the use of ./ at the beginning of the path, and the .svg extension at the end — these tell us that the file is local and that it is not a javascript file. indeed, the logo.svg ...
...unction named app. whereas most of the javascript community prefers camel-case names like helloworld, react components use pascal-case variable names, like helloworld, to make it clear that a given jsx element is a react component, and not a regular html tag. if you were to rename the app function to app, your browser would show you an error. let's look at app more closely. function app() { return ( <div classname="app"> <header classname="app-header"> <img src={logo} classname="app-logo" alt="logo" /> <p> edit <code>src/app.js</code> and save to reload. </p> <a classname="app-link" href="https://reactjs.org" target="_blank" rel="noopener noreferrer" > learn react </a> ...
...And 10 more matches

Extending a Protocol
, as we will need to convert it to utf-8 (using nscstring) to send it to the parent process. now let's implement the method in ./dom/base/navigator.cpp - we add a little bit of error boilerplate stuff, as is customary: already_addrefed<promise> navigator::echo(const nsastring& astring, errorresult& arv) { if (!mwindow || !mwindow->getdocshell()) { arv.throw(ns_error_unexpected); return nullptr; } refptr<promise> echopromise = promise::create(mwindow->asglobal(), arv); if (ns_warn_if(arv.failed())) { return nullptr; } // message passing magic will happen here! return echopromise.forget(); } ok, let's ./mach build and make sure everything is compiling ok. once it's compiled, ./mach run and you should be able to spin up the developer console and type: naviga...
...our goal is now to get that to settle with the value we sent in. ipdl basics while you are compiling, let's cover some ipdl basics. ...
...ng comments below). creating the protocol pecho.ipdl let's start by saving the following file to ./dom/ipc/pecho.ipdl. we will explain what all the parts mean below. note that the file's name and the protocol name must match. include protocol pwindowglobal; namespace mozilla { namespace dom { async refcounted protocol pecho { manager pwindowglobal; parent: async echo(nscstring data) returns (nscstring aresult); async __delete__(); }; } // namespace dom } // namespace mozilla now, edit "./dom/ipc/moz.build" file and add 'pecho.ipdl', to the ipdl_sources array. remember that it needs to be in alphabetical order or it won't compile. breaking it down: include protocol pwindowglobal; - we include pwindowglobal, because it's going to manage the protocol for us. async refcounte...
...And 10 more matches

Dict.jsm
ct adefault); boolean has(string akey); array listitems(); array listkeys(); array listvalues(); void set(string akey, object avalue); string tojson(); string tostring(); properties attribute type description count number the number of items in the dictionary. items iterator returns an iterator over all of the items in the dictionary; each item is returned as a pair (a two-element array) with the first element being the key and the second being the value. note: the order in which items are returned is arbitrary, and may change without notice. in addition, if the dictionary changes during iteration, no guarantees are made as to what will happen. keys ite...
...er all of the items in the dictionary; each item is returned as a pair (a two-element array) with the first element being the key and the second being the value. note: the order in which items are returned is arbitrary, and may change without notice. in addition, if the dictionary changes during iteration, no guarantees are made as to what will happen. keys iterator returns an iterator over all the keys in the dictionary. note: the order in which items are returned is arbitrary, and may change without notice. in addition, if the dictionary changes during iteration, no guarantees are made as to what will happen. values iterator returns an iterator over all the values in the dictionary. ...
... returns an iterator over all the keys in the dictionary. note: the order in which items are returned is arbitrary, and may change without notice. in addition, if the dictionary changes during iteration, no guarantees are made as to what will happen. values iterator returns an iterator over all the values in the dictionary. note: the order in which items are returned is arbitrary, and may change without notice. in addition, if the dictionary changes during iteration, no guarantees are made as to what will happen. constructor dict() creates and returns a new dictionary object. dict dict(); dict dict( object initalkeysandvalues ); parameters initialkeysandvalues optional a object containing key/value pairs with which to initialize the d...
...And 10 more matches

Places Developer Guide
vemark title", // the title of the livemark siteuri, // the uri of the site. a nsiuri object. feeduri, // the uri of the actual feed. a nsiuri object. bookmarks.default_index); // the position of the livemark in its parent folder. ...
...euri, // the uri of the site. a nsiuri object. feeduri, // the uri of the actual feed. a nsiuri object. bookmarks.default_index); // the position of the livemark in its parent folder. ...
... // the uri of the actual feed. a nsiuri object. bookmarks.default_index); // the position of the livemark in its parent folder. accessing bookmarks and related items accessing item properties for all items: string getitemtitle(aitemid) - returns an item's title int64 getitemindex(aitemid) - returns an item's position in it's parent folder prtime getitemtype(aitemid) - returns the type of an item (bookmark, folder, separator) prtime getitemdateadded(aitemid) - returns the time in microseconds that an item was added prtime getitemlastmodified(aitemid) - returns the time in microseconds that an item was last modified int64 getfolderidforitem(aitemid) - returns the id of the folder containing the given item. string getitemguid(aitemid) obsolete since gecko 14.0 -...
...And 10 more matches

An Overview of XPCOM
shown below. see a reference implementation of queryinterface for detailed information. ...
...he reference count to 0 sample::sample() : mrefcnt(0) { } sample::~sample() { } // typical, generic implementation of qi ns_imethodimp sample::queryinterface(const nsiid &aiid, void **aresult) { if (!aresult) { return ns_error_null_pointer; } *aresult = null; if (aiid.equals(kisupportsiid)) { *aresult = (void *) this; } if (!*aresult) { return ns_error_no_interface; } // add a reference addref(); return ns_ok; } ns_imethodimp_(nsrefcnt) sample::addref() { return ++mrefcnt; } ns_imethodimp_(nsrefcnt) sample::release() { if (--mrefcnt == 0) { delete this; return 0; } // optional: return the reference count return mrefcnt; } object interface discovery inheritance is another very important topic in object ori...
...to be cast to a circle. but enabling exceptions and rtti may not be an option because of performance overhead and compatibility on many platforms, so xpcom does things differently. exceptions in xpcom c++ exceptions are not supported directly by xpcom. instead all exceptions must be handled within a given component, before crossing interface boundaries. in xpcom, all interface methods should return an nsresult error value (see the xpcom api reference for a listing of these error codes). these error code results become the "exceptions" that xpcom handles. instead of leveraging c++ rtti, xpcom uses the special queryinterface method that casts the object to the right interface if that interface is supported. every interface is assigned an identifier that gets generated from a tool commonly ...
...And 10 more matches

nsIAccessibleTable
total number of selected columns. read only. note: renamed from selectedcolumnscount in gecko 1.9.2 selectedrowcount unsigned long the total number of selected rows. read only. note: renamed from selectedrowscount in gecko 1.9.2 summary astring the summary description for the table. for example, @summary attribute on html:table element. read only. methods return the accessible object at the specified row and column in the table. if both row and column index are valid then the corresponding accessible object is returned that represents the requested cell regardless of whether the cell is currently visible (on the screen). nsiaccessible getcellat( in long rowindex, in long columnindex ); parameters rowindex the row index of the cell. columninde...
...ed row and column in the table. if both row and column index are valid then the corresponding accessible object is returned that represents the requested cell regardless of whether the cell is currently visible (on the screen). nsiaccessible getcellat( in long rowindex, in long columnindex ); parameters rowindex the row index of the cell. columnindex the column index of the cell. return value an nsiaccessible object. translate the given row and column indices into the corresponding cell index. long getcellindexat( in long rowindex, in long columnindex ); parameters rowindex the row index of the cell. columnindex the column index of the cell. return value a cell index. getcolumndescription() return the description text of the specified column in the table. as...
... index. long getcellindexat( in long rowindex, in long columnindex ); parameters rowindex the row index of the cell. columnindex the column index of the cell. return value a cell index. getcolumndescription() return the description text of the specified column in the table. astring getcolumndescription( in long columnindex ); parameters columnindex the column index. return value the column description. getcolumnextentat() return the number of columns occupied by the accessible cell at the specified row and column in the table. ...
...And 10 more matches

nsIMicrosummaryService
i generatoruri ); parameters generatoruri the uri of the resource providing the generator. createmicrosummary() create a microsummary for a given page uri and generator uri. nsimicrosummary createmicrosummary( in nsiuri pageuri, in nsiuri generatoruri ); parameters pageuri the uri of the page to be summarized. generatoruri the uri of the microsummary generator. ...
...i ); parameters generatoruri the uri of the resource providing the generator. createmicrosummary() create a microsummary for a given page uri and generator uri. nsimicrosummary createmicrosummary( in nsiuri pageuri, in nsiuri generatoruri ); parameters pageuri the uri of the page to be summarized. generatoruri the uri of the microsummary generator. return value returns an nsimicrosummary for the given page and generator uris. getbookmarks() get the set of bookmarks with microsummaries. in the old rdf-based bookmarks datastore, bookmark ids are nsirdfresource objects. in the new places-based datastore, they are nsiuri objects. nsisimpleenumerator getbookmarks(); parameters none. return value returns an nsisimpleenumerator enumeration of bookmark ids. getgenera...
...microsummary for the given page and generator uris. getbookmarks() get the set of bookmarks with microsummaries. in the old rdf-based bookmarks datastore, bookmark ids are nsirdfresource objects. in the new places-based datastore, they are nsiuri objects. nsisimpleenumerator getbookmarks(); parameters none. return value returns an nsisimpleenumerator enumeration of bookmark ids. getgenerator() return a microsummary generator for the given uri. ...
...And 10 more matches

nsIMsgDBHdr
headers are backed by the database: a call to these functions directly modifies the state of the database, although it is not saved until the database is committed. ...
... headers are backed by the database: a call to these functions directly modifies the state of the database, although it is not saved until the database is committed. ...
... headers are backed by the database: a call to these functions directly modifies the state of the database, although it is not saved until the database is committed. ...
...And 10 more matches

nsIPromptService
e dialog. if set to null the parent window will be nsiwindowwatcher.activewindow. adialogtitle text to appear in the title of the dialog. atext text to appear in the body of the dialog. acheckmsg text to appear with the checkbox. acheckstate contains the initial checked state of the checkbox when this method is called and the final checked state after this method returns. if you call this method from javascript you need to wrap this argument in an object with its 'value' property set to a boolean (or use an empty object). see also the alertcheck_example. confirm() shows a dialog with ok and cancel buttons. boolean confirm( in nsidomwindow aparent, in wstring adialogtitle, in wstring atext ); parameters aparent the parent window for the dialog. i...
...irm() shows a dialog with ok and cancel buttons. boolean confirm( in nsidomwindow aparent, in wstring adialogtitle, in wstring atext ); parameters aparent the parent window for the dialog. if set to null the parent window will be nsiwindowwatcher.activewindow. adialogtitle text to appear in the title of the dialog. atext text to appear in the body of the dialog. return value true for ok, false for cancel see also the confirm_example. confirmcheck() shows a dialog with ok and cancel buttons and a labeled checkbox. see also the confirm_example. boolean confirmcheck( in nsidomwindow aparent, in wstring adialogtitle, in wstring atext, in wstring acheckmsg, inout boolean acheckstate ); parameters aparent the parent window for the dialog. if...
...e dialog. if set to null the parent window will be nsiwindowwatcher.activewindow. adialogtitle text to appear in the title of the dialog. atext text to appear in the body of the dialog. acheckmsg text to appear with the checkbox. acheckstate contains the initial checked state of the checkbox when this method is called and the final checked state after this method returns. if you call this method from javascript you need to wrap this argument in an object with its 'value' property set to a boolean (or use an empty object). return value true for ok, false for cancel confirmex() puts up a dialog with up to 3 buttons and an optional, labeled checkbox. the buttons are numbered 0 - 2. the implementation can decide what order the buttons appear in, and it may no...
...And 10 more matches

Add to iPhoto
fstringref = new ctypes.pointertype("cfstringref"); now that we've declared the core type, we can declare the methods we use that work with cfstring objects. let's take a look at one of these. ...
... ctypes.voidptr_t, // allocator ctypes.jschar.ptr, // pointer to the unicode string ctypes.int32_t); // length of the string cfstringcreatewithcharacters() is used to create a new cfstring object using a unicode string as the source string, which is copied into the new cfstring object. it returns a cfstringref, which is a pointer to the new string, and accepts, as input, three parameters: an allocator, which is a pointer to a routine that will allocate the memory to contain the new object (we use the ctypes.voidptr_t type for this), a pointer to the unicode string to copy into the new string object (ctypes.jschar.ptr), and the length of the unicode string in characters. cfurl the cfurl...
...ervices routine we'll be using to launch iphoto and pass it the image to import uses cfurl for the file references. let's take a look at two of the routines declared here: this.cfurlcreatefromfilesystemrepresentation = this.lib.declare("cfurlcreatefromfilesystemrepresentation", ctypes.default_abi, this.cfurlref, // returns ctypes.voidptr_t, // input: allocator ctypes.unsigned_char.ptr, // input: pointer to string cfindex, // input: string length ctypes.bool) // input: isdirectory this method is used to convert a unix pathname into an url. the intere...
...And 10 more matches

Using Objective-C from js-ctypes
". it uses the default system voice and waits until the speaking is done. #import <appkit/appkit.h> int main(void) { nsspeechsynthesizer* synth = [[nsspeechsynthesizer alloc] initwithvoice: nil]; [synth startspeakingstring: @"hello, firefox!"]; // wait until start speaking. while (![synth isspeaking]) {} // wait while speaking. while ([synth isspeaking]) {} [synth release]; return 0; } save this file as test.m, and run with the following command, inside the same directory as the saved file (needs xcode). $ clang -framework appkit test.m && ./a.out class, message, and selector our task at hand is to convert objective-c syntax to c syntax. let's look at the following codelet: [nsspeechsynthesizer alloc] it passes an alloc message to the nsspeechsynthesizer class, in...
...ough this objective-c syntax: get the nsspeechsynthesizer class definition. register the alloc selector for the message. send a message to the class, with the selector. get a reference to a class class definitions are retrieved with the objc_getclass function, declared in /usr/include/objc/runtime.h. the objc_getclass function receives the name of the class, looks up the definition, and returns it. class objc_getclass(const char *name); in /usr/include/objc/objc.h, class is defined as an opaque type by the following: typedef struct objc_class *class; in this example, we need the classnsspeechsynthesizer, which is retrieved with the following code: class nsspeechsynthesizer = objc_getclass("nsspeechsynthesizer"); registering a selector selectors can be registered and retrieved...
...f struct objc_class *class; in this example, we need the classnsspeechsynthesizer, which is retrieved with the following code: class nsspeechsynthesizer = objc_getclass("nsspeechsynthesizer"); registering a selector selectors can be registered and retrieved with sel_registername function, also declared in /usr/include/objc/runtime.h. sel_registername receives the name of the selector, and returns the selector. sel sel_registername(const char *str); sel is defined as follows, in /usr/include/objc/objc.h. it's also an opaque type. typedef struct objc_selector *sel; in this example, we need to send alloc, its selector can be retrieved with the following code: sel alloc = sel_registername("alloc"); sending a message once target class and selector are ready, you can send a message. ...
...And 10 more matches

Debugger.Frame - Firefox Developer Tools
d so on. (if more than one debugger instance is debugging the same code, each debugger gets a separate debugger.frame instance for a given frame. this allows the code using each debugger instance to place whatever properties it likes on its debugger.frame instances, without worrying about interfering with other debuggers.) when the debuggee pops a stack frame (say, because a function call has returned or an exception has been thrown from it), the debugger.frame instance referring to that frame becomes inactive: its live property becomes false, and accessing its other properties or calling its methods throws an exception. note that frames only become inactive at times that are predictable for the debugger: when the debuggee runs, or when the debugger removes frames from the stack itself. vis...
... push a "debugger" frame on the stack, witholder as its older property. invoke the debuggee code as appropriate for the given invocation function, with the "debugger" frame as its continuation. for example, debugger.frame.prototype.eval pushes an "eval" frame for code it runs, whereas debugger.object.prototype.call pushes a "call" frame. when the debuggee code completes, whether by returning, throwing an exception or being terminated, pop the "debugger" frame, and return an appropriate completion value from the invocation function to the debugger. when a debugger calls an invocation function to run debuggee code, that code’s continuation is the debugger, not the next debuggee code frame. pushing a "debugger" frame makes this continuation explicit, and makes it easier to find...
...alled as a constructor, false otherwise. arguments the arguments passed to the current frame, or null if this is not a "call" frame. when non-null, this is an object, allocated in the same global as the debugger, with array.prototype on its prototype chain, a non-writable length property, and properties whose names are array indices. each property is a read-only accessor property whose getter returns the current value of the corresponding parameter. when the referent frame is popped, the argument value’s properties’ getters throw an error. handler methods of debugger.frame instances each debugger.frame instance inherits accessor properties holding handler functions for spidermonkey to call when given events occur in the frame. calls to frames’ handler methods are cross-compartment,...
...And 10 more matches

How whitespace is handled by HTML, CSS, and in the DOM - Web APIs
in the dom can cause layout problems and make manipulation of the content tree difficult in unexpected ways, depending on where it is located. this article explores when difficulties can occur, and looks at what can be done to mitigate resulting problems. what is whitespace? whitespace is any string of text composed only of spaces, tabs or line breaks (to be precise, crlf sequences, carriage returns or line feeds). these characters allow you to format your code in a way that will make it easily readable by yourself and other people. in fact, much of our source code is full of these whitespace characters, and we only tend to get rid of it in a production build step to reduce code download sizes. html largely ignores whitespace? in the case of html, whitespace is largely ignored — whitesp...
...9 * "\n" lf \u000a * "\r" cr \u000d * " " spc \u0020 * * this does not use javascript's "\s" because that includes non-breaking * spaces (and also some other characters). */ /** * determine whether a node's text content is entirely whitespace. ...
... /** * determine whether a node's text content is entirely whitespace. * * @param nod a node implementing the |characterdata| interface (i.e., * a |text|, |comment|, or |cdatasection| node * @return true if all of the text content of |nod| is whitespace, * otherwise false. */ function is_all_ws( nod ) { // use ecma-262 edition 3 string and regexp features return !(/[^\t\n\r ]/.test(nod.textcontent)); } /** * determine if a node should be ignored by the iterator functions. * * @param nod an object implementing the dom1 |node| interface. ...
...And 10 more matches

Key Values - Web APIs
ymbol modifier key (found on certain virtual keyboards). keycode_sym (63) [3] "symbollock" the symbol lock key. [1] in internet explorer (tested on release 9 and 11), as well as in all versions of firefox, the windows key is reported as "os" instead of as "meta". this will be changed in firefox per bug 1232918. until that's fixed, these keys are returned as "os" by firefox: vk_lwin (0x5b) and vk_rwin (0x5c) on windows, and gdk_key_super_l (0xffeb), gdk_key_super_r (0xffec), gdk_key_hyper_l (0xffed), and gdk_key_hyper_r (0xffee) on linux. [2] internet explorer (tested on release 9 and 11) reports "scroll" instead of "scrolllock" for the scroll lock key. [3] firefox did not add support for the symbol key until firefox 37. [4] firefox generates...
... and "hyper". [5] chrome 67 and firefox 63 now correctly interpret the right alt key for keyboard layouts which map that key to altgr. see firefox bug bug 900750 and chrome bug 25503 for further details. ...
...[5] chrome 67 and firefox 63 now correctly interpret the right alt key for keyboard layouts which map that key to altgr. see firefox bug bug 900750 and chrome bug 25503 for further details. whitespace keys keyboardevent.key value description virtual keycode windows mac linux android "enter" the enter or ↵ key (sometimes labeled return). ...
...And 10 more matches

RTCIceServers.urls - Web APIs
examples let's look a few examples of varying complexity. ...
... examples let's look a few examples of varying complexity. ...
...er.example.org to negotiate connections. mypeerconnection = new rtcpeerconnection({ iceservers: [ { urls: "stun:stunserver.example.org" } ] }); notice that only the urls property is provided; the stun server doesn't require authentication, so this is all that's needed. ...
...And 10 more matches

BigUint64Array - JavaScript
byte order. if control over byte order is needed, use dataview instead. the contents are initialized to 0n. once established, you can reference elements in the array using the object's methods, or by using standard array index syntax (that is, using bracket notation). constructor biguint64array() creates a new biguint64array object. static properties biguint64array.bytes_per_element returns a number value of the element size. 8 in the case of a biguint64array. biguint64array.name returns the string value of the constructor name. in the case of the biguint64array type this is "biguint64array". static methods biguint64array.from() creates a new biguint64array from an array-like or iterable object. see also array.from(). biguint64array.of() creates a new biguint64array with ...
... value of the constructor name. in the case of the biguint64array type this is "biguint64array". static methods biguint64array.from() creates a new biguint64array from an array-like or iterable object. see also array.from(). biguint64array.of() creates a new biguint64array with a variable number of arguments. see also array.of(). ...
...ew biguint64array from an array-like or iterable object. see also array.from(). biguint64array.of() creates a new biguint64array with a variable number of arguments. see also array.of(). instance properties biguint64array.prototype.buffer returns the arraybuffer referenced by the biguint64array. this is fixed at construction time and thus read only. biguint64array.prototype.bytelength returns the length (in bytes) of the biguint64array from the start of its arraybuffer. this is fixed at construction time and thus read only. ...
...And 10 more matches

Destructuring assignment - JavaScript
o variables values can be swapped in one destructuring expression. without destructuring assignment, swapping two values requires a temporary variable (or, in some low-level languages, the xor-swap trick). ...
...expression. without destructuring assignment, swapping two values requires a temporary variable (or, in some low-level languages, the xor-swap trick). let a = 1; let b = 3; [a, b] = [b, a]; console.log(a); // 3 console.log(b); // 1 const arr = [1,2,3]; [arr[2], arr[1]] = [arr[1], arr[2]]; console.log(arr); // [1,3,2] parsing an array returned from a function it's always been possible to return an array from a function. ...
...temporary variable (or, in some low-level languages, the xor-swap trick). let a = 1; let b = 3; [a, b] = [b, a]; console.log(a); // 3 console.log(b); // 1 const arr = [1,2,3]; [arr[2], arr[1]] = [arr[1], arr[2]]; console.log(arr); // [1,3,2] parsing an array returned from a function it's always been possible to return an array from a function. destructuring can make working with an array return value more concise. ...
...And 10 more matches

Logical AND (&&) - JavaScript
the logical and (&&) operator (logical conjunction) for a set of operands is true if and only if all of its operands are true. it is typically used with boolean (logical) values. when it is, it returns a boolean value. however, the && operator actually returns the value of one of the specified operands, so if this operator is used with non-boolean values, it will return a non-boolean value. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax expr1 && expr2 description if expr1 can be converted to true, returns expr2; else, returns expr1. if a value can be converted to true, the value is so-called truthy. if ...
...a value can be converted to true, the value is so-called truthy. if a value can be converted to false, the value is so-called falsy. examples of expressions that can be converted to false are: null; nan; 0; empty string ("" or '' or ``); undefined. even though the && operator can be used with operands that are not boolean values, it can still be considered a boolean operator since its return value can always be converted to a boolean primitive. to explicitly convert its return value (or any expression in general) to the corresponding boolean value, use a double not operator or the boolean constructor. short-circuit evaluation the logical and expression is evaluated left to right, it is tested for possible "short-circuit" evaluation using the following rule: (some falsy expression)...
...hort-circuit evaluated to the falsy expression; short circuit means that the expr part above is not evaluated, hence any side effects of doing so do not take effect (e.g., if expr is a function call, the calling never takes place). this happens because the value of the operator is already determined after the evaluation of the first operand. see example: function a(){ console.log('called a'); return false; } function b(){ console.log('called b'); return true; } console.log( a() && b() ); // logs "called a" due to the function call, // then logs false (which is the resulting value of the operator) operator precedence the following expressions might seem equivalent, but they are not, because the && operator is executed before the || operator (see operator precedence). true || false && fal...
...And 10 more matches

menupopup - Archive of obsolete content
/> <menuitem label="submenu2 item 2"/> </menupopup> </menu> <menupopup/> onpopuphiding type: script code this event is sent to a popup when it is about to be hidden. onpopupshowing type: script code this event is sent to a popup just before it is opened. this handler is usually used to dynamically set the contents when the user requests to display it. returning false from this event handler prevents the popup from appearing. onpopupshown type: script code this event is sent to a popup after it has been opened, much like the onload event is sent to a window when it is opened. position type: string the position attribute determines where the popup appears relative to the element the user clicked to invoke the popup. this allows you to...
... if both x and y have the value -1 the call will realign the popup with its anchor node. openpopup( anchor , position , x , y , iscontextmenu, attributesoverride, ...
... if both x and y have the value -1 the call will realign the popup with its anchor node. openpopup( anchor , position , x , y , iscontextmenu, attributesoverride, triggerevent ) ...
...And 9 more matches

Basic math in JavaScript — numbers and operators - Learn web development
yint; myfloat; number values are typed in without quote marks — try declaring and initializing a couple more variables containing numbers before you move on. now let's check that both our original variables are of the same datatype. there is an operator called typeof in javascript that does this. enter the below two lines as shown: typeof myint; typeof myfloat; you should get "number" returned in both cases — this makes things a lot easier for us than if different numbers had different data types, and we had to deal with them in different ways. phew! useful number methods the number object, an instance of which represents all standard numbers you'll use in your javascript, has a number of useful methods available on it for you to manipulate numbers. we don't cover these in detai...
...decimal.tofixed(2); twodecimalplaces; converting to number data types sometimes you might end up with a number that is stored as a string type, which makes it difficult to perform calculations with it. this most commonly happens when data is entered into a form input, and the input type is text. there is a way to solve this problem — passing the string value into the number() constructor to return a number version of the same value. for example, try typing these lines into your console: let mynumber = '74'; mynumber + 3; you end up with the result 743, not 77, because mynumber is actually defined as a string. you can test this by typing in the following: typeof mynumber; to fix the calculation, you can do this: number(mynumber) + 3; arithmetic operators arithmetic operators are the...
... operator name purpose example + addition adds two numbers together. 6 + 9 - subtraction subtracts the right number from the left. 20 - 15 * multiplication multiplies two numbers together. 3 * 7 / division divides the left number by the right. 10 / 5 % remainder (sometimes called modulo) returns the remainder left over after you've divided the left number into a number of integer portions equal to the right number. 8 % 3 (returns 2, as three goes into 8 twice, leaving 2 left over). ** exponent raises a base number to the exponent power, that is, the base number multiplied by itself, exponent times. it was first introduced in ecmascript 2016. 5 ** 2 (ret...
...And 9 more matches

WebRequest.jsm
onal opt_extrainfospec argument lets you pass extra instructions for the handling of events. the instructions you can pass here vary depending on the event you're listening to: see the event-specific documentation for details. in particular, "blocking" may be passed to several event types, and will make the event dispatch synchronous, so the browser will wait for the event listener to return before continuing with the request. this then enables the event listener to modify or cancel the request. see modifying & canceling requests. some examples of using addlistener(). to remove a listener for an event, call removelistener on the event in question, passing it the listener to remove. filtering the filter argument is the second argument to addlistener(). if you don't pass ...
...st: that is, the webrequest event that your listener is attached to. for example, it obviously doesn't make sense to cancel a network request after it has completed. the general approach to modifying and canceling requests is this: first, pass an array containing the string "blocking" as the third argument to your addlistener() call. ...
...er is attached to. for example, it obviously doesn't make sense to cancel a network request after it has completed. the general approach to modifying and canceling requests is this: first, pass an array containing the string "blocking" as the third argument to your addlistener() call. this tells the browser to wait for your event listener to return before continuing with the request. ...
...And 9 more matches

NSS API Guidelines
when it becomes too difficult. many routines are defined to take an nssarena *arenaopt argument. this means if an arena is specified (non-null), it is used, otherwise (null) the routine uses the heap. you can think of the heap as a default arena you can't destroy. error handling nss 3.0 introduces the concept of an error stack. when something goes wrong, the call stack unwinds, with routines returning an error indication. each level which flags a problem, adds its own error number to the stack. at the bottom of the stack is the fundamental error, for example: file not found, and on top is an error precisely relating to what you are doing. note: error stacks are vertical, and never horizontal. if multiple things go wrong simultaneously, and you want to report them all, use another mechanis...
...er horizontal. if multiple things go wrong simultaneously, and you want to report them all, use another mechanism. errors, though not integers, are done as external constants, instead of preprocessor definitions. this is so any additional error doesn't trigger the entire tree to rebuild. likewise, the external references to errors are made in the prototypes files, with the functions which can return them. error stacks are thread-private. the usual semantic is that public routines clear the stack first, private routines don't. usually, every public routine has a private counterpart, and the implementation of the public routine looks like this: nssimplement rv * nsstype_method ( nsstype *t, nssfoo *arg1, nssbar *arg2 ) { nss_clearerrorstac...
... routines clear the stack first, private routines don't. usually, every public routine has a private counterpart, and the implementation of the public routine looks like this: nssimplement rv * nsstype_method ( nsstype *t, nssfoo *arg1, nssbar *arg2 ) { nss_clearerrorstack(); #ifdef debug if( !nssfoo_verifypointer(arg1) ) return (rv *)null; if( !nssbar_verifypointer(arg2) ) return (rv *)null; #endif /* debug */ return nsstype_method(t, arg1, arg2); } aside from error cases, all documented entry points should check pointers in a debug, wherever possible. pointers to user-supplied buffers, and templates, should be checked against null. pointers to context-style functions should be checked...
...And 9 more matches

NSS Sample Code Sample1
&pubkey, pr_true, pr_true, 0); if (!prvkey) { rv = 1; goto done; } // set the nickname on the private key so that it // can be found later. ...
... if (rv) goto done; } // do the mac key if (!mwrappedmackey) { pk11symkey *key = 0; // the key size is 160 bits (20 bytes) key = pk11_keygen(slot, ckm_generic_secret_key_gen, 0, 160/8, 0); if (!key) { rv = 1; goto mac_done; } rv = wrapkey(key, pubkey, &mwrappedmackey); mac_done: if (key) pk11_freesymkey(key); } done: if (slot) pk11_freeslot(slot); return rv; } int server::exportpublickey(secitem **pubkeydata) { int rv = 0; seckeypublickey *pubkey = 0; rv = getpublickey(&pubkey); if (rv) goto done; *pubkeydata = seckey_encodedersubjectpublickeyinfo(pubkey); if (!*pubkeydata) { rv = 1; goto done; } done: if (pubkey) seckey_destroypublickey(pubkey); return rv; } int server::exportkeys(secitem *pubkeydata, secitem **wrappedencke...
... key rv = wrapkey(menckey, pubkey, &data); if (rv) goto done; // export the mac key rv = wrapkey(mmackey, pubkey, wrappedmackey); if (rv) goto done; // commit the rest of the operation *wrappedenckey = data; data = 0; done: if (data) secitem_freeitem(data, pr_true); if (pubkey) seckey_destroypublickey(pubkey); if (keyinfo) seckey_destroysubjectpublickeyinfo(keyinfo); return rv; } int server::importkeys(secitem *wrappedenckey, secitem *wrappedmackey) { int rv = 0; if (mwrappedenckey || mwrappedmackey) { rv = 1; goto done; } mwrappedenckey = secitem_dupitem(wrappedenckey); if (!mwrappedenckey) { rv = 1; goto done; } mwrappedmackey = secitem_dupitem(wrappedmackey); if (!mwrappedmackey) { rv = 1; goto done; } done: return rv; } int server::start() { ...
...And 9 more matches

Python binding for NSS
/nspr objects which have "get" and "set" api function calls are exposed as python properties. all nss/nspr python objects can print their current value by evaluting the python object in a string context or by using the python str() function. support threading. the python global interpreter lock (gil) is released prior to calling nss/nspr c functions and reaquired after the nss/nspr c function returns. this allows other python threads to execute during the time a nss/nspr function is progress in another thread. also, any "global" values which are set in python-nss are actually thread-local. examples of this are the various callbacks which can be set and their parameters. thus each thread gets it own set of callbacks. many methods/functions provide sane default (keyword) parameters freeing th...
...values which are set in python-nss are actually thread-local. examples of this are the various callbacks which can be set and their parameters. thus each thread gets it own set of callbacks. many methods/functions provide sane default (keyword) parameters freeing the python programmer from having to specify all parameters yet allowing them to be overriden when necessary. error codes are never returned from methods/functions. python-nss follows the existing python exception mechanism. any error reported by nss/nspr is converted into a python exception and raised. the exact error code, error description, and often contextual error information will be present in the exception object. enumerated constants used in the nss/nspr api's are available in the python module under the exact same name as...
...ed certifcate validation including ca certs can be done via certificate.verify() or certificate.is_ca_cert(). when cert validation fails you can now obtain diagnostic information as to why the cert failed to validate. this is encapsulated in the certverifylog class which is a iterable collection of certverifylognode objects. most people will probablby just print the string representation of the returned certverifylog object. cert validation logging is handled by the certificate.verify() method. support has also been added for the various key usage and cert type entities which feature prominently during cert validation. certificate() constructor signature changed from certificate(data=none, der_is_signed=true) to certificate(data, certdb=cert_get_default_c...
...And 9 more matches

pkfnc.html
nickname a pointer to the nickname in the certificate database or to the nickname in the token. wincx a pointer to application data for the password callback function. this pointer is set with ssl_setpkcs11pinarg during ssl configuration. to retrieve its current value, use ssl_revealpinarg. ...
... a pointer to the nickname in the certificate database or to the nickname in the token. wincx a pointer to application data for the password callback function. this pointer is set with ssl_setpkcs11pinarg during ssl configuration. to retrieve its current value, use ssl_revealpinarg. returns the function returns one of these values: if successful, a pointer to a certificate structure. if unsuccessful, null. description a nickname is an alias for a certificate subject. there may be multiple certificates with the same subject, and hence the same nickname. this function will return the newest certificate that matches the subject, based on the notbefore / notafter fields of the certificate. whe...
...to a certificate structure. if unsuccessful, null. description a nickname is an alias for a certificate subject. there may be multiple certificates with the same subject, and hence the same nickname. this function will return the newest certificate that matches the subject, based on the notbefore / notafter fields of the certificate. when you are finished with the certificate structure returned by pk11_findcertfromnickname, you must free it by calling cert_destroycertificate. the pk11_findcertfromnickname function calls the password callback function set with pk11_setpasswordfunc and passes it the pointer specified by the wincx parameter. pk11_findkeybyanycert finds the private key associated with a specified certificate in any available slot. syntax #include <pk11func.h> #in...
...And 9 more matches

sslcrt.html
a certusageemailsigner certusageemailrecipient certusageobjectsigner certusageusercertimport certusageverifyca certusageprotectedobjectsigner wincx the pin argument value to pass to pk11 functions. see description below for more information. returns the function returns one of these values: if successful, secsuccess. if unsuccessful, secfailure. use pr_geterror to obtain the error code. description the cert_verifycertnow function must call one or more pk11 functions to obtain the services of a pkcs #11 module. some of the pk11 functions require a pin argument (see ssl_setpkcs11pinarg for details), which must be specified in th...
...<cert.h> secstatus cert_verifycertname( certcertificate *cert, char *hostname); parameters this function has the following parameters: cert a pointer to the certificate against which to check the hostname referenced by hostname. hostname the hostname to be checked. returns the function returns one of these values: if the common name in the subject dn for the certificate matches the domain name passed in the hostname parameter, secsuccess. if the common name in the subject dn for the certificate is not identical to the domain name passed in the hostname parameter, secfailure. use pr_geterror to obtain the error code. description the comparison perform...
...ert, int64 t); parameters this function has the following parameters: cert a pointer to the certificate whose validity period you want to check against. t the time to check against the certificate's validity period. for more information, see the nspr header pr_time.h. returns the function returns an enumerator of type seccerttimevalidity: typedef enum { seccerttimevalid, seccerttimeexpired, seccerttimenotvalidyet } seccerttimevalidity; nss_cmpcertchainwcanames determines whether any of the signers in the certificate chain for a specified certificate are on a specified list of ca names. syntax #include <nss.h> secstatus nss_cmpcertchainwcanames( c...
...And 9 more matches

Finishing the Component
*acompmgr, nsifile *apath, const char *registrylocation, const char *componenttype, const nsmodulecomponentinfo *info) { nsresult rv; nscomptr<nsiservicemanager> servman = do_queryinterface((nsisupports*)acompmgr, &rv); if (ns_failed(rv)) return rv; nscomptr<nsicategorymanager> catman; servman->getservicebycontractid(ns_categorymanager_contractid, ns_get_iid(nsicategorymanager), getter_addrefs(catman)); if (ns_failed(rv)) return rv; char* previous = nsnull; rv = catman->addcategoryentry("xpcom-startup", "weblock", ...
...a similar step is required for unregistration. implementing the nsicontentpolicy at this point, you can take the weblock component and install it into a gecko installation. when the component is loaded, gecko calls the nsicontentpol...
...categoryentry in the same way we did in registering for notifications. a similar step is required for unregistration. implementing the nsicontentpolicy at this point, you can take the weblock component and install it into a gecko installation. when the component is loaded, gecko calls the nsicontentpolicy implementation in weblock on every page load, and this prevents pages from displaying by returning the proper value when the load method is called. the web locking policy that we are going to put into place is quite simple: for every load request that comes through, we will ensure that the uri is in the list of "good" urls on the white list. if you care to extend this implementation so that the list of urls is held remotely on a server somewhere - as might be the case when the weblock co...
...And 9 more matches

NS_ConvertASCIItoUTF16
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 9 more matches

NS_ConvertUTF8toUTF16
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 9 more matches

nsAdoptingString
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 9 more matches

nsAutoString
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 9 more matches

nsDependentString
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 9 more matches

nsFixedString
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 9 more matches

nsPromiseFlatString
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 9 more matches

nsString
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 9 more matches

nsXPIDLString
@param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use ...
...ind print32 find(const nscstring&, prbool, print32, print32) const - source search for the given substring within this string. @param astring is substring to be sought in this @param aignorecase selects case sensitivity @param aoffset tells us where in this string to start searching @param acount tells us how far from the offset we are to search. use -1 to search the whole string. ...
... - source this methods scans the string backwards, looking for the given string @param astring is substring to be sought in this @param aignorecase tells us whether or not to do caseless compare @param aoffset tells us where in this string to start searching. use -1 to search from the end of the string. @param acount tells us how many iterations to make starting at the given offset. ...
...And 9 more matches

nsIAccessibleRetrieval
nsidomnode getrelevantcontentnodefor(in nsidomnode anode); astring getstringeventtype(in unsigned long aeventtype); astring getstringrelationtype(in unsigned long arelationtype); astring getstringrole(in unsigned long arole); nsidomdomstringlist getstringstates(in unsigned long astates, in unsigned long aextrastates); methods getaccessiblefor() return an nsiaccessible for a dom node in pres shell 0. create a new accessible of the appropriate type if necessary, or use one from the accessibility cache if it already exists. nsiaccessible getaccessiblefor( in nsidomnode anode ); parameters anode the dom node to get an accessible for. return value the nsiaccessible for the given dom node. getaccessibleinshell() return an nsiaccessible ...
...ode in the given pres shell. create a new accessible of the appropriate type if necessary, or use one from the accessibility cache if it already exists. nsiaccessible getaccessibleinshell( in nsidomnode anode, in nsipresshell apresshell ); parameters anode the dom node to get an accessible for. apresshell the presentation shell which contains layout info for the dom node. return value the nsiaccessible for the given dom node. getaccessibleinweakshell() obsolete since gecko 2.0 (firefox 4 / thunderbird 3.3 / seamonkey 2.1) return an nsiaccessible for a dom node in the given weak shell. create a new accessible of the appropriate type if necessary, or use one from the accessibility cache if it already exists. nsiaccessible getaccessibleinweakshell(...
...he given weak shell. create a new accessible of the appropriate type if necessary, or use one from the accessibility cache if it already exists. nsiaccessible getaccessibleinweakshell( in nsidomnode anode, in nsiweakreference apresshell ); parameters anode the dom node to get an accessible for. apresshell the presentation shell which contains layout info for the dom node. return value the nsiaccessible for the given dom node. getaccessibleinwindow() obsolete since gecko 2.0 (firefox 4 / thunderbird 3.3 / seamonkey 2.1) return an nsiaccessible for a dom node in present shell for this dom window. create a new accessible of the appropriate type if necessary, or use one from the accessibility cache if it already exists. nsiaccessible getaccessiblein...
...And 9 more matches

nsIDOMMozNetworkStatsManager
in jsval start, in jsval end, [optional] in jsval options /* networkstatsgetoptions */); parameters network the origin of the data. it can specify wifi, mobile, or null. if null, data measurement from both origins are merged. to know in advance which kind of origin is available, the moznetworkstatsmanager.getavailablenetworks method returns an array of interfaces. start a date object representing the beginning of data measurement. end a date object representing the end of data measurement. options optional filtering options. networkstatsgetoptions is a dictionary object providing filtering options. return value an nsidomdomrequest object. if successful, the request result is an nsidommoznetworkstats object describing the ...
...xbytes are undefined for those dates. if the filtering start date is greater than the end date, an exception is thrown. exceptions thrown ns_error_invalid_arg the filtering start date is greater than the end date. ns_error_not_implmented both appmanifesturl and servicetype are specified at the same time in the networkstatsgetoptions dictionary. invalidnetwork the network must be in the return of getavailablenetworks. addalarm() install an alarm on a network. when total data usage reaches threshold bytes, a "networkstats-alarm" system message is sent to the application, where the optional parameter data must be a cloneable object. nsidomdomrequest addalarm(in nsisupports network, in long threshold, [optional] in jsval options /* n...
...ports network, in long threshold, [optional] in jsval options /* networkstatsalarmoptions */); parameters network the origin of the data. it can specify wifi, mobile, or null. if null, data measurement from both origins are merged. ...
...And 9 more matches

nsITextInputProcessor
stance of this interface with the following code: var tip = components.classes["@mozilla.org/text-input-processor;1"]. createinstance(components.interfaces.nsitextinputprocessor); next, you need to get the rights to create composition or dispatch keyboard events with begininputtransaction() or begininputtransactionfortests(): if (!tip.begininputtransaction(window, callback)) { return; } if begininputtransaction() or begininputtransactionfortests() returns false, it means that another instance of nsitextinputprocessor has composition on the window or is dispatching an event. in this case, other instances cannot create composition nor dispatch keyboard events on the window. the second argument, callback, should be an object which implements nsitextinputprocessorcallback or j...
...in this case, composition isn't created. so, js-ime shouldn't continue to compose the string. finally, when you commit the composition with the last composition string...
...in this case, composition isn't created. so, js-ime shouldn't continue to compose the string. ...
...And 9 more matches

nsIURI
rfc3987: internationalized resource identifiers subclasses of nsiuri, such as nsiurl, impose further structure on the uri. ...
...bility with existing internet infrastructure. read only. note: ipv6 addresses are not enclosed in square brackets. asciispec acstring (us-ascii) the uri spec with an ascii compatible encoding. the host portion follows the idna draft spec. other parts are url-escaped per the rules of rfc3986. the result is strictly ascii. read only. hasref boolean returns if there is a reference portion (the part after the "#") of the uri. host autf8string the host is the internet domain name to which this uri refers. it could be an ipv4 (or ipv6) address literal. if supported, it could be a non-ascii internationalized domain name. exceptions thrown ns_error_failure if host is not applicable to the uri scheme (e.
...g on the protocol). note: some characters may be escaped. port long the uri's port. a port value of -1 corresponds to the protocol's default port (for example -1 implies port 80 for http uris). exceptions thrown ns_error_failure if port is not applicable to the uri scheme (e.g. about:blank) prepath autf8string the prepath returns the string before the path (such as "scheme://user:password@host:port"). this is related to the web origin concept of rfc6454. this is useful for authentication, managing sessions, or for checking the origin of an uri to prevent cross-site scripting attacks while using methods such as window.postmessage(). note: some characters may be escaped. read only. ref autf8string...
...And 9 more matches

Working with Multiple Versions of Interfaces
that prompted this note, i needed to obtain the hwnd of the document (yes its on windows) in order to identify each particular extension instance. ...
...nce. to do this i used the accessibility framework: hwnd gethwnd(nsidomnode *node){ hwnd self = null; nsresult rv; nscomptr<nsiaccessibleretrieval> refp; refp = do_createinstance( "@mozilla.org/accessibleretrieval;1", &rv); if (ns_failed(rv)){ return self; } //line 6. nscomptr<nsiaccessible> accnode; rv = refp->getaccessiblefor(node, getter_addrefs(accnode)); if(ns_failed(rv)){ return self; } void *wh = null; nscomptr<nsiaccessibledocument> accdocnode; accdocnode = do_queryinterface(accnode, &rv); if(ns_failed(rv)){ return self; } rv = accdocnode->getwindowhandle(&wh); if(ns_succeeded(rv)){ self = static_cast<hwnd>(wh); } return self; } this approach worked, as is, for versions as early as firefox 1.5. the problem arises when one tries to run an extension built ...
... xpcom component so that first tries to get the interface by it's new iid, then if that fails, attempts plan b. plan b is simply trying to get the interface by it's older iid. for expository purposes we will do this in two stages; buoyed by the fact that it is the actual route we took. the optimist's solution the first thing we do is replace line 6 above by our plan b: if (ns_failed(rv)){ return gethwndb(node); } //new line 6. and then implement plan b. we first dredge out the old interface identifiers from our yea olde firefox 1.5 sdk: static const nsiid iar_iid_old = { 0x663ca4a8, 0xd219, 0x4000, { 0x92, 0x5d, 0xd8, 0xf6, 0x64, 0x06, 0xb6, 0x26 }}; static const nsiid iad_iid_old = {0x8781fc88, 0x355f, 0x4439, { 0x88, 0x1f, 0x65, 0x04, 0xa0, 0xa1, 0xce, 0xb6 }}; then follow the ...
...And 9 more matches

AudioWorkletProcessor.process - Web APIs
sample array rather than assuming a particular size. this size may even be allowed to change over time, so you mustn't look at just the first block and assume the sample buffers will always be the same size. syntax var isactivelyprocessing = audioworkletprocessor.process(inputs, outputs, parameters); parameters inputs an array of inputs connected to the node, each item of which is, in turn, an array of channels. each channel is a float32array containing 128 samples. for example, inputs[n][m][i] will access n-th input, m-th channel of that input, and i-th sample of that channel. each sample value is in range of [-1 .. 1]. the number of inputs and thus the length of that array is fixed at the construction of the node (see audioworkletnodeoptions). if there is no active node conne...
...ray will contain 128 values — one for each frame in the current audio block. if there's no automation happening during the time represented by the current block, the array may contain a single value that is constant for the entire block, instead of 128 identical values. if the automation rate is "k-rate", the array will contain a single value, which is to be used for each of 128 frames. ...
...constant for the entire block, instead of 128 identical values. if the automation rate is "k-rate", the array will contain a single value, which is to be used for each of 128 frames. return value a boolean value indicating whether or not to force the audioworkletnode to remain active even if the user agent's internal logic would otherwise decide that it's safe to shut down the node. the returned value lets your processor have influence over the lifetime policy of the audioworkletprocessor and the node that owns it. ...
...And 9 more matches

Cache - Web APIs
use the caches only from the version of the script that they can safely operate on. see deleting old caches for more information. note: the key matching algorithm depends on the vary header in the value. so matching a new key requires looking at both key and value for entries in the cache. note: the caching api doesn't honor http caching headers. methods cache.match(request, options) returns a promise that resolves to the response associated with the first matching request in the cache object. cache.matchall(request, options) returns a promise that resolves to an array of all matching requests in the cache object. cache.add(request) takes a url, retrieves it and adds the resulting response object to the given cache. this is functionally equivalent to calling fetch(), then using ...
...ctionally equivalent to calling fetch(), then using put() to add the results to the cache. cache.addall(requests) takes an array of urls, retrieves them, and adds the resulting response objects to the given cache. cache.put(request, response) takes both a request and its response and adds it to the given cache. cache.delete(request, options) finds the cache entry whose key is the request, returning a promise that resolves to true if a matching cache entry is found and deleted. if no cache entry is found, the promise resolves to false. cache.keys(request, options) returns a promise that resolves to an array of cache keys. examples this code snippet is from the service worker selective caching sample. (see selective caching live) the code uses cachestorage.open() to open any cache obj...
...est, options) returns a promise that resolves to an array of cache keys. examples this code snippet is from the service worker selective caching sample. (see selective caching live) the code uses cachestorage.open() to open any cache objects with a content-type header that starts with font/. the code then uses cache.match() to see if there's already a matching font in the cache, and if so, returns it. if there isn't a matching font, the code fetches the font from the network and uses cache.put() to cache the fetched resource. the code handles exceptions thrown from the fetch() operation. note that an http error response (e.g., 404) will not trigger an exception. it will return a normal response object that has the appropriate error code. the code snippet also shows a best practice for v...
...And 9 more matches

CacheStorage - Web APIs
ns (i.e. those that aren't using https, although this definition will likely become more complex in the future.) when testing, you can get around this by checking the "enable service workers over http (when toolbox is open)" option in the firefox devtools options/gear menu. note: cachestorage.match() is a convenience method. ...
...e.match() is a convenience method. equivalent functionality to match a cache entry can be implemented by returning an array of cache names from cachestorage.keys(), opening each cache with cachestorage.open(), and matching the one you want with cache.match(). methods cachestorage.match() checks if a given request is a key in any of the cache objects that the cachestorage object tracks, and returns a promise that resolves to that match. cachestorage.has() returns a promise that resolves to true if a cache object matching the cachename exists. ...
...ache with cachestorage.open(), and matching the one you want with cache.match(). methods cachestorage.match() checks if a given request is a key in any of the cache objects that the cachestorage object tracks, and returns a promise that resolves to that match. cachestorage.has() returns a promise that resolves to true if a cache object matching the cachename exists. ...
...And 9 more matches

DOMMatrixReadOnly - Web APIs
e are aliases for specific components of a 4×4 matrix, as shown below. 2d 3d equivalent a m11 b m12 c m21 d m22 e m41 f m42 methods this interface doesn't inherit any methods. none of the following methods alter the original matrix. dommatrixreadonly.flipx() returns a new dommatrix created by flipping the source matrix around its x-axis. this is equivalent to multiplying the matrix by dommatrix(-1, 0, 0, 1, 0, 0). the original matrix is not modified. dommatrixreadonly.flipy() returns a new dommatrix created by flipping the source matrix around its y-axis. this is equivalent to multiplying the matrix by dommatrix(1, 0, 0, -1, 0, 0). the original matrix i...
... matrix around its x-axis. this is equivalent to multiplying the matrix by dommatrix(-1, 0, 0, 1, 0, 0). the original matrix is not modified. dommatrixreadonly.flipy() returns a new dommatrix created by flipping the source matrix around its y-axis. this is equivalent to multiplying the matrix by dommatrix(1, 0, 0, -1, 0, 0). the original matrix is not modified. dommatrixreadonly.inverse() returns a new dommatrix created by inverting the source matrix. if the matrix cannot be inverted, the new matrix's components are all set to nan and its is2d property is set to false. the original matrix is not altered. dommatrixreadonly.multiply() returns a new dommatrix created by computing the dot product of the source matrix and the specified matrix: a⋅b. if no matrix is specified as the multipl...
...by computing the dot product of the source matrix and the specified matrix: a⋅b. if no matrix is specified as the multiplier, the matrix is multiplied by a matrix in which every element is 0 except the bottom-right corner and the element immediately above and to its left: m33 and m34. these have the default value of 1. the original matrix is not modified. ...
...And 9 more matches

HTMLElement - Web APIs
a:hover text { fill: #0095dd; pointer-events: all;} properties inherits properties from its parent, element, and implements those from documentandelementeventhandlers, elementcssinlinestyle, globaleventhandlers, htmlorforeignelement and toucheventhandlers. htmlelement.accesskey is a domstring representing the access key assigned to the element. htmlelement.accesskeylabel read only returns a domstring containing the element's assigned access key. htmlelement.contenteditable is a domstring, where a value of true means the element is editable and a value of false means it isn't. htmlelement.iscontenteditable read only returns a boolean that indicates whether or not the content of the element can be edited. htmlelement.contextmenu is a htmlmenuelement representing the contex...
...tring, where a value of true means the element is editable and a value of false means it isn't. htmlelement.iscontenteditable read only returns a boolean that indicates whether or not the content of the element can be edited. htmlelement.contextmenu is a htmlmenuelement representing the contextual menu associated with the element. it may be null. htmlorforeignelement.dataset read only returns a domstringmap with which script can read and write the element's custom data attributes (data-*) . htmlelement.dir is a domstring, reflecting the dir global attribute, representing the directionality of the element. ...
... htmlelement.hidden is a boolean indicating if the element is hidden or not. ...
...And 9 more matches

KeyboardEvent - Web APIs
the key could originate from. the numlock key does not fall into this group and is always encoded with the location dom_key_location_standard. examples include the digits on the numeric keypad, the keypad's enter key, and the decimal point on the keypad. properties this interface also inherits properties of its parents, uievent and event. keyboardevent.altkey read only returns a boolean that is true if the alt ( option or ⌥ on os x) key was active when the key event was generated. keyboardevent.code read only returns a domstring with the code value of the physical key represented by the event. warning: this ignores the user's keyboard layout, so that if the user presses the key at the "y" position in a qwerty keyboard layout (near the middle of the row above the...
... alt ( option or ⌥ on os x) key was active when the key event was generated. keyboardevent.code read only returns a domstring with the code value of the physical key represented by the event. warning: this ignores the user's keyboard layout, so that if the user presses the key at the "y" position in a qwerty keyboard layout (near the middle of the row above the home row), this will always return "keyy", even if the user has a qwertz keyboard (which would mean the user expects a "z" and all the other properties would indicate a "z") or a dvorak keyboard layout (where the user would expect an "f"). ...
...o that if the user presses the key at the "y" position in a qwerty keyboard layout (near the middle of the row above the home row), this will always return "keyy", even if the user has a qwertz keyboard (which would mean the user expects a "z" and all the other properties would indicate a "z") or a dvorak keyboard layout (where the user would expect an "f"). keyboardevent.ctrlkey read only returns a boolean that is true if the ctrl key was active when the key event was generated. keyboardevent.iscomposing read only returns a boolean that is true if the event is fired between after compositionstart and before compositionend. ...
...And 9 more matches

SubtleCrypto.unwrapKey() - Web APIs
as with subtlecrypto.importkey(), you specify the key's import format and other attributes of the key to import details such as whether it is extractable, and which operations it can be used for. ...
...y be used to encrypt messages. decrypt: the key may be used to decrypt messages. sign: the key may be used to sign messages. verify: the key may be used to verify signatures. derivekey: the key may be used in deriving a new key. derivebits: the key may be used in deriving bits. wrapkey: the key may be used to wrap a key. unwrapkey: the key may be used to unwrap a key return value result is a promise that fulfills with the unwrapped key as a cryptokey object. exceptions the promise is rejected when one of the following exceptions is encountered: invalidaccesserror raised when the unwrapping key is not a key for the requested unwrap algorithm or if the cryptokey.usages value of that key doesn't contain unwrap. notsupported raised when trying to use an algo...
...171,223,14,36,201,233,233,120,164,68,217,192,226,80, 224,39,199,235,239,60,212,169,100,23,61,54,244,197,160,80,109,230,207, 225,57,197,175,71,80,209]; /* convert an array of byte values to an arraybuffer. ...
...And 9 more matches

TextEncoder.prototype.encodeInto() - Web APIs
the textencoder.prototype.encodeinto() method takes a usvstring to encode and a destination uint8array to put resulting utf-8 encoded text into, and returns a dictionary object indicating the progress of the encoding. this is potentially more performant than the older encode() method especially when the target buffer is a view into a wasm heap. syntax b1 = encoder.encodeinto(string, uint8array); parameters string is a usvstring containing the text to encode. uint8array is a uint8array object instance to place the resulting utf-8 encoded text into. return value a textencoderencodeintoresult dictionary, which contains two members: read the number of utf-16 units of code from the source that has been converted over to utf-8. this may be less than string.length if uint8array di...
...ritten are guaranteed to form complete utf-8 byte sequences. encode into a specific position encoder.encodeinto always puts its output at the start of the array. however, it is sometimes useful to make the output start at a particular index. the solution is typedarray.prototype.subarray(). observe. var encoder = new textencoder; function encodeintoatposition(string, u8array, position) { return encoder.encodeinto(string, position ? u8array.subarray(position|0) : u8array); } var u8array = new uint8array(8); encodeintoatposition("hello", u8array, 2); console.log( "" + u8array.join() ); // 0,0,104,101,108,108,111,0 buffer sizing to convert a javascript string s, the output space needed for full conversion is never less than s.length bytes and never greater than s.length * 3 bytes. if t...
... it makes sense to compute minimum allocation rounduptobucketsize(s.length), the maximum allocation size s.length * 3, and to have a chosen (as a tradeoff between memory usage and speed) threshold t such that if rounduptobucketsize(s.length) + t >= s.length * 3, you simply allocate for s.length * 3. otherwise, first allocate for rounduptobucketsize(s.length) and convert. if the read item it the return dictionary is s.length, the conversion is done. if not, reallocate the target buffer to written + (s.length - read) * 3 and then convert the rest by taking a substring of s starting from index read and a subbuffer of the target buffer starting from index written. above rounduptobucketsize() is a function that rounds up to the allocator bucket size. for example, if your wasm allocator is known to...
...And 9 more matches

Window.open() - Web APIs
nal a domstring containing a comma-separated list of window features given with their corresponding values in the form "name=value". these features include options such as the window's default size and position, whether or not to include toolbar, and so forth. there must be no whitespace in the string. see window features below for documentation of each of the features that can be specified. return value a windowproxy object, which is basically a thin wrapper for the window object representing the newly created window, and has all its features available. if the window couldn't be opened, the returned value is instead null. the returned reference can be used to access properties and methods of the new window as long as it complies with same-origin policy security requirements. description ...
...cription the open() method creates a new secondary browser window, similar to choosing new window from the file menu. the url parameter specifies the url to be fetched and loaded in the new window. if url is an empty string, then a new blank, empty window (url about:blank) is created with the default toolbars of the main window. note that remote urls won't load immediately. when window.open() returns, the window always contains about:blank. the actual fetching of the url is deferred and starts after the current script block finishes executing. the window creation and the loading of the referenced resource are done asynchronously. examples var windowobjectreference; var windowfeatures = "menubar=yes,location=yes,resizable=yes,scrollbars=yes,status=yes"; function openrequestedpopup() { wi...
...indow.open("http://www.cnn.com/", "cnn_windowname", windowfeatures); } var windowobjectreference; function openrequestedpopup() { windowobjectreference = window.open( "http://www.domainname.ext/path/imagefile.png", "descriptivewindowname", "resizable,scrollbars,status" ); } if a window with the name already exists, then url is loaded into the existing window. in this case the return value of the method is the existing window and windowfeatures is ignored. providing an empty string for url is a way to get a reference to an open window by its name without changing the window's location. on firefox and chrome (at least), this only works from the same parent, ie. if the current window is the opener of the window you try to get an handle on. otherwise the call to window.open() wi...
...And 9 more matches

Using CSS transitions - CSS: Cascading Style Sheets
; transition-property: width height background-color font-size left top transform -webkit-transformv color; transition-duration: 0.5s; transition-timing-function: ease-in-out; } function updatetransition() { var el = document.queryselector("div.box"); if (el) { el.classname = "box1"; } else { el = document.queryselector("div.box1"); el.classname = "box"; } return el; } var intervalid = window.setinterval(updatetransition, 7000); transition-duration: 1s <div class="parent"> <div class="box">lorem</div> </div> .parent { width: 250px; height:125px;} .box { width: 100px; height: 100px; background-color: red; font-size: 20px; left: 0px; top: 0px; position: absolute; -webkit-transition-property: width hei...
...out; transition-property: width height background-color font-size left top transform -webkit-transform color; transition-duration: 1s; transition-timing-function: ease-in-out; } function updatetransition() { var el = document.queryselector("div.box"); if (el) { el.classname = "box1"; } else { el = document.queryselector("div.box1"); el.classname = "box"; } return el; } var intervalid = window.setinterval(updatetransition, 7000); transition-duration: 2s <div class="parent"> <div class="box">lorem</div> </div> .parent { width: 250px; height:125px;} .box { width: 100px; height: 100px; background-color: red; font-size: 20px; left: 0px; top: 0px; position: absolute; -webkit-transition-property: width hei...
...out; transition-property: width height background-color font-size left top transform -webkit-transform color; transition-duration: 2s; transition-timing-function: ease-in-out; } function updatetransition() { var el = document.queryselector("div.box"); if (el) { el.classname = "box1"; } else { el = document.queryselector("div.box1"); el.classname = "box"; } return el; } var intervalid = window.setinterval(updatetransition, 7000); transition-duration: 4s <div class="parent"> <div class="box">lorem</div> </div> .parent { width: 250px; height:125px;} .box { width: 100px; height: 100px; background-color: red; font-size: 20px; left: 0px; top: 0px; position: absolute; -webkit-transition-property: width hei...
...And 9 more matches

HTTP Index - HTTP
requests while rejecting others. 22 reason: cors disabled authentication, authentication article, cors, cross-origin, disabled, errors, http, https, messages, resource, same origin, same-origin, security, sharing, validation, secure, troubleshooting a request that needs to use cors was attempted, but cors is disabled in the user's browser. when this happens, the user needs to turn cors back on in their browser. 23 reason: cors header 'access-control-allow-origin' does not match 'xyz' cors, corsalloworiginnotmatchingorigin, cross-origin, error, http, https, messages, reasons, security, console, troubleshooting simply put, the origin making the request does not match any of the origins permitted by the access-control-allow-origin header. 24 r...
...ence, so that it allows a user to differentiate according to the users' own preferred language. 73 content-length http, headers, reference the content-length entity header indicates the size of the entity-body, in bytes, sent to the recipient. 74 content-location http, reference, header the content-location header indicates an alternate location for the returned data. the principal use is to indicate the url of a resource transmitted as the result of content negotiation. 75 content-range http, http header, reference, response header, header the content-range response http header indicates where in a full body message a partial message belongs. 76 content-security-policy csp, content security policy, http, reference, ...
...ation about the acceleration of the device through the batterymanager interface obtained via navigator.getbattery(). 127 feature-policy: camera directive, feature policy, feature-policy, http, reference, camera the http feature-policy header camera directive controls whether the current document is allowed to use video input devices. when this policy is enabled, the promise returned by mediadevices.getusermedia() will reject with a notallowederror. 128 feature-policy: display-capture the http feature-policy header display-capture directive controls whether or not the document is permitted to use screen capture api, i.e.,getdisplaymedia() to capture the screen's contents. 129 feature-policy: document-domain directive, experimental, featu...
...And 9 more matches

Iterators and generators - JavaScript
m simple for loops to map() and filter(). iterators and generators bring the concept of iteration directly into the core language and provide a mechanism for customizing the behavior of for...of loops. for details, see also: iteration_protocols for...of function* and generator yield and yield* iterators in javascript an iterator is an object which defines a sequence and potentially a return value upon its termination. specifically, an iterator is any object which implements the iterator protocol by having a next() method that returns an object with two properties: value the next value in the iteration sequence. done this is true if the last value in the sequence has already been consumed. if value is present alongside done, it is the iterator's return value. once created, a...
... while it is easy to imagine that all iterators could be expressed as arrays, this is not true. ...
...e. once created, an iterator object can be iterated explicitly by repeatedly calling next(). iterating over an iterator is said to consume the iterator, because it is generally only possible to do once. after a terminating value has been yielded additional calls to next() should simply continue to return {done: true}. the most common iterator in javascript is the array iterator, which simply returns each value in the associated array in sequence. while it is easy to imagine that all iterators could be expressed as arrays, this is not true. arrays must be allocated in their entirety, but iterators are consumed only as necessary. because of this, iterators can express sequences of unlimited size, such as the range of integers between 0 and infinity. here is an example which can do just that...
...And 9 more matches

Using Promises - JavaScript
« previousnext » a promise is an object representing the eventual completion or failure of an asynchronous operation. since most people are consumers of already-created promises, this guide will explain consumption of returned promises before explaining how to create them. essentially, a promise is a returned object to which you attach callbacks, instead of passing callbacks into a function. imagine a function, createaudiofileasync(), which asynchronously generates a sound file given a configuration record and two callback functions, one called if the audio file is successfully created, and the other called if an error occurs. here's some code that uses createaudiofileasync(): function successcallback(result) { console.log("audio file ready at url: " + result); } funct...
...le is successfully created, and the other called if an error occurs. ...
...this convention has several advantages. we will explore each one. guarantees unlike old-fashioned pass...
...And 9 more matches

Working with objects - JavaScript
object.keys(o...
...bject and the object's name as arguments to the function: function showprops(obj, objname) { var result = ``; for (var i in obj) { // obj.hasownproperty() is used to filter out properties from the object's prototype chain if (obj.hasownproperty(i)) { result += `${objname}.${i} = ${obj[i]}\n`; } } return result; } so, the function call showprops(mycar, "mycar") would return the following: mycar.make = ford mycar.model = mustang mycar.year = 1969 enumerate the properties of an object starting with ecmascript 5, there are three native ways to list/traverse object properties: for...in loops this method traverses all enumerable properties of an object and its prototype chain. object.keys(o) this method returns an array with all the own (not in the prototype c...
...object starting with ecmascript 5, there are three native ways to list/traverse object properties: for...in loops this method traverses all enumerable properties of an object and its prototype chain. object.keys(o) this method returns an array with all the own (not in the prototype chain) enumerable properties' names ("keys") of an object o. object.getownpropertynames(o) this method returns an array containing all own properties' names (enumerable or not) of an object o. before ecmascript 5, there was no native way to list all properties of an object. however, this can be achieved with the following function: function listallproperties(o) { var objecttoinspect; var result = []; for(objecttoinspect = o; objecttoinspect !== null; objecttoinspect = object.getprototy...
...And 9 more matches

arguments.callee - JavaScript
expressions a name or use a function declaration where a function must call itself. why was arguments.callee removed from es5 strict mode? (adapted from a stack overflow answer by olliej) early versions of javascript did not allow named function expressions, and for this reason you could not make a recursive function expression. ...
...s5 strict mode? (adapted from a stack overflow answer by olliej) early versions of javascript did not allow named function expressions, and for this reason you could not make a recursive function expression. for example, this syntax worked: function factorial (n) { return !(n > 1) ? 1 : factorial(n - 1) * n; } [1, 2, 3, 4, 5].map(factorial); but: [1, 2, 3, 4, 5].map(function(n) { return !(n > 1) ? 1 : /* what goes here? */ (n - 1) * n; }); did not. to get around this arguments.callee was added so you could do [1, 2, 3, 4, 5].map(function(n) { return !(n > 1) ? 1 : arguments.callee(n - 1) * n; }); however, this was actually a really bad solution as this (in conjunction with other arguments, callee, and caller issues) make inlining and tail recursion impossible in the gener...
...1 : factorial(n - 1)*n; }); this has numerous benefits: the function can be...
...And 9 more matches

Float32Array - JavaScript
e platform byte order. if control over byte order is needed, use dataview instead. the contents are initialized to 0. once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation). constructor float32array() creates a new float32array object. static properties float32array.bytes_per_element returns a number value of the element size. 4 in the case of an float32array. float32array.name returns the string value of the constructor name. in the case of the float32array type: "float32array". static methods float32array.from() creates a new float32array from an array-like or iterable object. see also array.from(). float32array.of() creates a new float32array with a variable number of a...
...e returns the string value of the constructor name. in the case of the float32array type: "float32array". static methods float32array.from() creates a new float32array from an array-like or iterable object. see also array.from(). float32array.of() creates a new float32array with a variable number of arguments. see also array.of(). instance properties float32array.prototype.buffer returns the arraybuffer referenced by the float32array fixed at construction time and thus read only. float32array.prototype.bytelength returns the length (in bytes) of the float32array from the start of its arraybuffer. fixed at construction time and thus read only. float32array.prototype.byteoffset returns the offset (in bytes) of the float32array from the start of its arraybuffer. fixed at constr...
...tion time and thus read only. float32array.prototype.bytelength returns the length (in bytes) of the float32array from the start of its arraybuffer. fixed at construction time and thus read only. float32array.prototype.byteoffset returns the offset (in bytes) of the float32array from the start of its arraybuffer. fixed at construction time and thus read only. float32array.prototype.length returns the number of elements hold in the float32array. fixed at construction time and thus read only. instance methods float32array.prototype.copywithin() copies a sequence of array elements within the array. see also array.prototype.copywithin(). float32array.prototype.entries() returns a new array iterator object that contains the key/value pairs for each index in the array. see also array.p...
...And 9 more matches

Float64Array - JavaScript
e platform byte order. if control over byte order is needed, use dataview instead. the contents are initialized to 0. once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation). constructor float64array() creates a new float64array object. static properties float64array.bytes_per_element returns a number value of the element size. 8 in the case of an float64array. float64array.name returns the string value of the constructor name. in the case of the float64array type: "float64array". static methods float64array.from() creates a new float64array from an array-like or iterable object. see also array.from(). float64array.of() creates a new float64array with a variable number of a...
...e returns the string value of the constructor name. in the case of the float64array type: "float64array". static methods float64array.from() creates a new float64array from an array-like or iterable object. see also array.from(). float64array.of() creates a new float64array with a variable number of arguments. see also array.of(). instance properties float64array.prototype.buffer returns the arraybuffer referenced by the float64array fixed at construction time and thus read only. float64array.prototype.bytelength returns the length (in bytes) of the float64array from the start of its arraybuffer. fixed at construction time and thus read only. float64array.prototype.byteoffset returns the offset (in bytes) of the float64array from the start of its arraybuffer. fixed at constr...
...tion time and thus read only. float64array.prototype.bytelength returns the length (in bytes) of the float64array from the start of its arraybuffer. fixed at construction time and thus read only. float64array.prototype.byteoffset returns the offset (in bytes) of the float64array from the start of its arraybuffer. fixed at construction time and thus read only. float64array.prototype.length returns the number of elements hold in the float64array. fixed at construction time and thus read only. instance methods float64array.prototype.copywithin() copies a sequence of array elements within the array. see also array.prototype.copywithin(). float64array.prototype.entries() returns a new array iterator object that contains the key/value pairs for each index in the array. see also array.p...
...And 9 more matches

String.prototype.charAt() - JavaScript
the string object's charat() method returns a new string consisting of the single utf-16 code unit located at the specified offset into the string. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax let character = str.charat(index) parameters index an integer between 0 and str.length - 1. if the index cannot be converted to the integer or no index is provided, the default is 0, so the first character of str is returned. return value a string representing the character (exactly one utf-16 code unit) at the specified index. if index is out of range, charat() returns an empty string. description charact...
... if no index is provided to charat(), the default is 0. ...
... character, even if the string contains characters that are not in the basic multi-lingual plane. ...
...And 9 more matches

Strict mode - JavaScript
catenation problem and it means that you have to explicitly export any shared variables out of the function scope. strict mode for functions likewise, to invoke strict mode for a function, put the exact statement "use strict"; (or 'use strict';) in the function's body before any other statements. function strict() { // function-level strict mode syntax 'use strict'; function nested() { return 'and so am i!'; } return "hi! i'm a strict mode function! " + nested(); } function notstrict() { return "i'm not strict."; } strict mode for modules ecmascript 2015 introduced javascript modules and therefore a 3rd way to enter strict mode. the entire contents of javascript modules are automatically in strict mode, with no statement needed to initiate it. function strict() { // becau...
...sible object) will throw in strict mode: 'use strict'; // assignment to a non-writable global var undefined = 5; // throws a typeerror var infinity = 5; // throws a typeerror // assignment to a non-writable property var obj1 = {}; object.defineproperty(obj1, 'x', { value: 42, writable: false }); obj1.x = 9; // throws a typeerror // assignment to a getter-only property var obj2 = { get x() { return 17; } }; obj2.x = 5; // throws a typeerror // assignment to a new property on a non-extensible object var fixed = {}; object.preventextensions(fixed); fixed.newprop = 'ohai'; // throws a typeerror third, strict mode makes attempts to delete undeletable properties throw (where before the attempt would simply have no effect): 'use strict'; delete object.prototype; // throws a typeerror fourth...
... duplicated argument hides previous identically-named arguments. those previous arguments remain available through arguments[i], so they're not completely inaccessible. still, this hiding makes little sense and is probably undesirable (it might hide a typo, for example), so in strict mode duplicate argument names are a syntax error: function sum(a, a, c) { // !!! syntax error 'use strict'; return a + a + c; // wrong if this code ran } sixth, a strict mode in ecmascript 5 forbids octal syntax. the octal syntax isn't part of ecmascript 5, but it's supported in all browsers by prefixing the octal number with a zero: 0644 === 420 and "\045" === "%". in ecmascript 2015 octal number is supported by prefixing a number with "0o". i.e. var a = 0o10; // es2015: octal novice developers sometime...
...And 9 more matches

platform/xpcom - Archive of obsolete content
ented under the "using wrappedjsobject" section of how to build an xpcom component in javascript. ...
...e class id instead of the contract id. ...
...an find out whether a factory or service has been registered by using the isregistered() function: if (xpcom.isregistered(factory)) xpcom.unregister(factory); globals constructors factory(options) parameters options : object required options: name type component constructor constructor for the component this factory creates. this will typically return a descendant of unknown, although it may return a custom object that satisfies the nsisupports interface. optional options: name type contract string a contract id. users of xpcom can use this value to retrieve the factory from components.classes: var factory = components.classes['@me.org/request'] var component = factory.createinstance(ci...
...And 8 more matches

Canvas code snippets - Archive of obsolete content
for general information about using <canvas> see the canvas topic page. code usable from web content getting the number of pixels of a certain color in a canvas the following function will return the number of pixels in a canvas that have the rgb color of r, g and b. this can be very useful to compare for example if a user has painted over another area as explained in this blog post. ...
...rea as explained in this blog post. ...
... cx = canvas.getcontext('2d'); var pixels = cx.getimagedata(0, 0, canvas.width, canvas.height); var all = pixels.data.length; var amount = 0; for (i = 0; i < all; i += 4) { if (pixels.data[i] === r && pixels.data[i + 1] === g && pixels.data[i + 2] === b) { amount++; } } return amount; }; getting the color of a pixel in a canvas this following snippet returns an object with the rgba values of the pixel at position x and y of the canvas. ...
...And 8 more matches

How to convert an overlay extension to restartless - Archive of obsolete content
things confusing. it is nonetheless the "correct" and best way to do things. ...
...httprequest;1", "nsixmlhttprequest"); here's how to load a file using it: function loadfile(url,type,returnresult) { var request = new xmlhttprequest(); request.open("get", url, true); // async=true request.responsetype = type; request.onerror = function(event) { logerrormessage("error attempting to load: " + url); returnresult(null); }; request.onload = function(event) { if (request.response) returnresult(request.response); else request.onerror(event); }; request.send(); } loadfile("chrome://myaddon/content/filename.ext",datatype,function(data) { /* do stuff with data */ }); note: when using xmlhttprequest to access a file:// url the request.status is n...
...: manually handle default preferences normal extensions load default preferences from a standardized file automatically. restartless extensions don't (for no good reason). this part is fairly easy to implement yourself, at least. ...
...And 8 more matches

Using Dependent Libraries In Extension Components - Archive of obsolete content
rv; // this is not the real component. we want to load the dependent libraries // of the real component, then the component itself, and call nsgetmodule on // the component. ...
...al component, then the component itself, and call nsgetmodule on // the component. ...
...dent; ++dependent) { library->setnativeleafname(nsdependentcstring(*dependent)); prlibrary *lib; library->load(&lib); // 1) we don't care if this failed! // 2) we are going to leak this library. we don't care about that either. } library->setnativeleafname(ns_literal_cstring(krealcomponent)); prlibrary *lib; rv = library->load(&lib); if (ns_failed(rv)) return rv; nsgetmoduleproc getmoduleproc = (nsgetmoduleproc) pr_findfunctionsymbol(lib, ns_get_module_symbol); if (!getmoduleproc) return ns_error_failure; return getmoduleproc(acompmgr, alocation, aresult); } extensions/stub/bdsstubloader.cpp (for mac os x) the code as written above won't work for mac os x. dependant libraries on the mac must be loaded with a special system function n...
...And 8 more matches

textbox (Toolkit autocomplete) - Archive of obsolete content
type: integer the maximum number of characters that the textbox allows to be entered. maxrows type: integer the number of rows to show in the results list at a time. a scrollbar will appear so the user can scroll through the remaining items. minresultsforpopup new in thunderbird 3requires seamonkey 2.0 type: integer the minimum number of results that must be returned for the popup to be displayed. the default value is 1. new in thunderbird 3requires seamonkey 2.0 a zero value will always open the popup. this can be used to display additional items that are not autocomplete results. nomatch type: boolean this attribute will be set to true if the last search resulted in no matches. overview an onchange attribute is an event listener to the obje...
...this event is only called when the text displayed would change, thus it is not called when the user presses non-displayable keys. onsearchbegin type: script code this event handler is called when the autocomplete search begins. note: for firefox 12 and above, thi...
...3requires seamonkey 2.0 type: boolean if true, a comment column appears in the popup. for the url history, the comment column will contain the page titles associated with each url. if this attribute is not specified, the comment column doesn't appear. showimagecolumn type: boolean if true, an image column appears in the popup. there is no default styling of this image, but the class name returned by the results appears in the property list for the column. if this attribute is not specified, the image column doesn't appear. size type: integer the number of characters that can be displayed in the textbox. tabindex type: integer the tab order of the element. the tab order is the order in which the focus is moved when the user presses the "tab" key. elements with a higher ...
...And 8 more matches

E4X for templating - Archive of obsolete content
pt 1.8 expression closures), the templates can function more dynamically, offering the power and readability of templating languages such as smarty for php (though admittedly without the currently wider cross-browser support of xslt or the strictly-xml approach of phptal or seethrough templating). ...
... currently wider cross-browser support of xslt or the strictly-xml approach of phptal or seethrough templating). ...
...mplating). security and escaping function e (str) { if (typeof str === 'xml') {str = str.tostring();} return str; } function quot (s) { // useful for placing user input within inline javascript; may be combined with escape function above as well if (typeof s === 'string') { return s.replace(/"/g, '&quot;').replace(/'/g, '&apos;'); } if (typeof s === 'xml') { return s.tostring().replace(/"/g, '&quot;').replace(/'/g, '&apos;'); } return string(s).replace(/"/g, '&quot;').replace(/'/g, '&apos;'); } localization e4x works nicely with a simple utility for localizing strings of a properties file: // localization function $s(msg, args){ //get localized message var strs = cc['@mozilla.org/intl/stringbundle;1'].getservice(ci.nsistringbundleservice). ...
...And 8 more matches

Index - MDN Web Docs Glossary: Definitions of Web-related terms
ders: 50 cors-safelisted response header cors, fetch, glossary, http a cors-safelisted response header is an http header which has been safelisted so that it will not be filtered when responses are processed by cors, since they're considered safe (as the headers listed in access-control-expose-headers). 51 crlf cr, crlf, glossary, infrastructure, lf, carriage return, line feed cr and lf are control characters or bytecode that can be used to mark a line break in a text file. 52 crud glossary, infrastructure crud (create, read, update, delete) is an acronym for ways one can operate on stored data. it is a mnemonic for the four basic functions of persistent storage. crud typically refers to operations performed in a database or datas...
...se each time. challenge-response protocols are one way to fight against replay attacks where an attacker listens to the previous messages and resends them at a later time to get the same credentials as the original message. 71 character codingscripting, glossary, strings a character is either a symbol (letters, numbers, punctuation) or non-printing "control" (e.g., carriage return or soft hyphen). utf-8 is the most common character set and includes the graphemes of the most popular human languages. 72 character encoding composing, glossary an encoding defines a mapping between bytes and text. a sequence of bytes allows for different textual interpretations. by specifying a particular encoding (such as utf-8), we specify how the sequence of bytes is to...
...language specification on which javascript is based. ecma international is in charge of standardizing ecmascript. 126 effective connection type glossary, navigator, network information api, networkinformation, performance, reference, web performance, connect, effective connection type, effectivetype effective connection type (ect) refers to the measured network performance, returning a cellular connection type, like 3g, even if the actual connection is tethered broadband or wifi, based on the time between the browser requesting a page and effective type of the connection. 127 element codingscripting, glossary, html an element is a part of a webpage. in xml and html, an element may contain a data item or a chunk of text or an image, or perhaps nothing. ...
...And 8 more matches

Mobile accessibility - Learn web development
android and ios the most common mobile platforms have fully functional screen readers. these function in much the same way as desktop screenreaders, except they are largely operated using touch gestures rather than key combinations. let's look at the main two: talkback on android and voiceover on ios. android talkback the talkback screen reader is built into the android operating system. ...
...for example: single-tapping an app will select it, and the device will read out what the app is. swiping left and right will move between apps, or buttons/controls if you are in a control bar. ...
......
...And 8 more matches

Mozilla accessibility architecture
use similar concepts, but use different method, constant and interfaces names. given that there is a fair amount of commonality between accessibility api toolkits, it made sense to write of the code in a cross platform manner, and then deal with the platform differences on a consistent manner. the shared code makes itself available to the toolkit-specific code via generic xpcom interfaces that return information about objects we want to expose. all focusable nodes, tables and text have accessibility interfaces. we call these objects "accessible nodes". each of these accessible nodes supports at minimum the generic cross-platform accessibility interface nsiaccessible (which provides a text name, enumerated role identifier and a set of state flags) and sometimes additional interfaces. for exam...
...so, what if they want to get dom information, like css rules, tag names and attributes, that msaa's iaccessible does not provide? on windows, we solve this by supporting an additional interface beyond msaa's iaccesible, for every dom node. queryinterface() can be used to switch between the two interfaces. if there is no msaa node for a dom node, paccessible->queryinterface(iid_iaccessible) will return null. in addition, some vendors had asked us to provide information and support for pieces of text smaller than a text node (i.e. a word), and mozilla supports isimpledomtext for this purpose. on atk there is no such interface to get actual dom information. sun microsystems, the maintainers of mozilla's atk support, believe the atk is rich enough to provide everything the assistive technologies o...
...s to call the nsiaccessible methods in "this" to get at the information it needs. class inheritence diagram view the class inheritence diagram. 3. accessible tree construction and traversal the accessible tree is constructed on demand. ...
...And 8 more matches

Following the Android Toasts Tutorial from a JNI Perspective
for example, if the class is blah.foo.bar then the signature of this will be this in slash notation with an l and ; around it. so this would be lblah/foo/bar;. if there is a sub class such as blah.foo.bar.subclass then a dollar sign is used in the slash notation, so this would be lblah/foo/bar$subclass;. when declaring methods, ...
... of this will be this in slash notation with an l and ; around it. so this would be lblah/foo/bar;. if there is a sub class such as blah.foo.bar.subclass then a dollar sign is used in the slash notation, so this would be lblah/foo/bar$subclass;. when declaring methods, the signatures of the types go right next to each other without any spacing. the arguments are within the parenthesis, and the return type is immediately following. more on this later. so let us now declare the types for our toast example. we see we have three classes and two basic types (int and void). the class signature is looked up on the android documentation. for instance, we go to android reference :: context and we see: we see that the signature in dot notation is android.content.context. so this will be written as ...
...is static, this means that it can be called directly from the class. if it is not static, then it cannot be used on an instance of that class. how is it determined if a method is static or not? the documentation tells us. for example, in our case we have a method maketext and show, looking that up on the android documentation page shows this: there are two columns, the first column is the return, and the second column is the method name and arguments. we see that maketext returns static toast. this means it is a static method. we see that the return column of the show method does not contain the word static. therefore, it is a plain method. let's declare these methods in the third argument of loadclass we add a key-value pair, with the key being static_methods and methods and the value b...
...And 8 more matches

OS.File for the main thread
llowing snippet opens a file "file.txt" and read its contents as a string, using the default encoding (utf-8). the content is read asynchronously. the result is a promise. let decoder = new textdecoder(); // this decoder can be reused for several reads let promise = os.file.read("file.txt"); // read the complete file as an array promise = promise.then( function onsuccess(array) { return decoder.decode(array); // convert this array to a text } ); this example requires firefox 18 or a more recent version. example: write a string to a file the following snippet writes the text "this is some text" to a string "file.txt", using the default encoding (utf-8). it uses an atomic write to ensure that the file is not modified if, for some reason, the write cannot complete (t...
... convert this array to a text } ); this example requires firefox 18 or a more recent version. example: write a string to a file the following snippet writes the text "this is some text" to a string "file.txt", using the default encoding (utf-8). ...
...ramming with os.file – in most cases, function os.file.writeatomic is a better choice. let writestream = function writestream(data, outfile, chunksize) { let view = new uint8array(data); let loop = function loop(pos) { // define a recursive asynchronous loop. if (pos <= view.bytelength) { // note: should this be pos >= view.bytelength ? return promise.resolve(true); // loop end. } let promise = file.write(view.subarray(pos, chunksize)); // write a subset of |data| return promise.then(function onsuccess(bytes) { return loop(pos + bytes); // ... and loop. }); }; let promise = loop(0); ...
...And 8 more matches

Using XPCOM Utilities to Make Things Easier
ce and not an iid. inside the macro, the interface name expands to ns_get_iid(), which is another macro that extracts the iid from the generated header of the interface. when an interface is written in xpidl, the headers include static declarations of their iids. on any interface that is generated by xpidl, you can call ns_get_iid() to obtain the iid which is associated with that interface. // returns a reference to a shared nsiid object\ static const nsiid iid1 = ns_get_iid(nsisupports); // constructs a new nsiid object static const nsiid iid2 = ns_isupports_iid; in order to use ns_impl_isupportsn, you must be sure that a member variable of type nsrefcnt is defined and named mrefcnt in your class. but why even bother when you can use another macro? declaration macros ns_decl_nsisupports...
... summarizes the macro usage in this portion of the weblock.cpp source file: common xpcom macros ns_impl_isupportsn implements nsisupports for a given class with n number of interfaces ns_decl_isupports declares methods of nsisupports including mrefcnt ns_init_isupports initializes mrefcnt to zero. must be called in class's constructor ns_get_iid returns the iid given the name of an interface. interface must be generated by xpidl using the macros described here, the code for the weblock component has gone from around 340 lines of code to just under 40. clearly from a code maintenance point of view, this kind of reduction is outstanding. the entire source file with these macros included appears in weblock2.cpp. weblock2.cpp the listing b...
... abstract classes, respectively. this first example shows an nsembedcstring being used to pass an nsacstring to a method that's not expected to modify the string. // in idl: method(in acstring thing); char* str = "how now brown cow?"; nsembedcstring data(str); rv = object->method(data); in this next example, the method is going to set the value of the string - as it might need to do when it returns the name of the current user or the last viewed url. // in idl: attribute acstring data; nsembedcstring data; method->getdata(data); // now to extract the data from the url class: const char* astringurl = url.get(); note that the memory pointed to by astringurl after the call to url.get() is owned by the url string object. if you need to keep this string data around past the lifetime of t...
...And 8 more matches

Introduction to XPCOM for the DOM
his is why it is very important to keep track of the reference count of each object. in the first case, if we forget to addref the object, the object may delete itself before we are done using the pointer, which would cause a crash when dereferencing it. in the second case, if we forget to release the object, it will never delete itself, which will cause "memory leaks", i.e. the memory is never returned because we keep the object around even if we don't need it. in both cases it's very bad, and we have to be extremely careful with the refcounting. fortunately, there are nscomptr's to make our life easier. nscomptr scott collins blessed us with the nscomptr, now let's use them. nscomptr's are an extension of the c auto_ptr, managing the reference counting operations for you, and providing se...
...ke to manipulate that object with a method defined on the nsifoo interface. the goal is to retrieve a pointer to the nsifoo interface. to do so, there are two main techniques, and the context should tell you what to use. the first technique is to use a "getter", the second is to use a static cast on the "this" pointer. a getter is a function defined in global scope or in class scope that will "return" a pointer to the required interface. generally getters work like this: first, declare a pointer to an interface, ifooptr without assigning it. pass the address of the pointer to the getter function. the getter function will then assign to the pointer the correct address and will queryinterface the pointer to that interface. ifooptr is now a pointer to an interface assigned to the address of a re...
... this is a contract between the caller, who says "i don't add a reference to this object because you have already done it", and the callee who says "i add a reference to this object, so don't do it!". if both the caller and the callee perform the addref, the object will be leaked, because one of the two references will never be released! please note that all getter functions have to addref the returned pointer. if you're just using the getter function though, you don't need to worry about it. more about this in the xpcom ownership guide. please also note that some interfaces are not refcounted, like the frames and views. for those you have to use raw interface pointers, and you don't have to perform any manual refcounting. let's say that you now want to execute a function declared on the ns...
...And 8 more matches

IAccessibleAction
[propget] hresult keybinding([in] long actionindex, [in] long nmaxbindings, [out, size_is(,nmaxbindings), length_is(, nbindings)] bstr keybindings, [out] long nbindings ); [propget] hresult localizedname([in] long actionindex, [out] bstr localizedname ); hresult nactions([out,retval] long nactions ); [propget] hresult name([in] long actionindex, [out] bstr name ); methods description() returns a description of the specified action of the object. [propget] hresult description( [in] long actionindex, [out] bstr description ); parameters actionindex 0 based index specifying which action's description to return. if it lies outside the valid range an empty string is returned. description the returned value is a localized string of the specified action. return value e_invalidarg if b...
...lt description( [in] long actionindex, [out] bstr description ); parameters actionindex 0 based index specifying which action's description to return. if it lies outside the valid range an empty string is returned. description the returned value is a localized string of the specified action. return value e_invalidarg if bad [in] passed, [out] value is null. s_false if there is nothing to return, [out] value is null. s_ok. doaction() performs the specified action on the object. hresult doaction( [in] long actionindex ); parameters actionindex 0 based index specifying the action to perform. ...
..."ctrl+shift+d". ...
...And 8 more matches

mozIStorageStatement
read only. parametercount unsigned long number of parameters. read only. params mozistoragestatementparams the current list of named parameters, which may be set. only available to javascript code. read only. row mozistoragestatementrow the current row, with access to all data members by name. available only to javascript code. read only. ...
...onnection.close(). void finalize(); note: this method does not need to be used from native callers because you have to release the statement in order to not leak. finalize will be called for you when the reference count on the statement goes to zero. clone() creates a copy of the statement whose state will be mozistoragestatement.moz_storage_statement_ready. mozistoragestatement clone(); return value a mozistoragestatement that is a copy of the current statement. getparametername() obtains the name of the parameter for the specified index. autf8string getparametername( in unsigned long aparamindex ); parameters aparamindex the zero-based numerical index for the parameter to be bound. this will be one less than the number used in the sql (<code>?1</code> maps to <code>0</co...
...atement that is a copy of the current statement. getparametername() obtains the name of the parameter for the specified index. autf8string getparametername( in unsigned long aparamindex ); parameters aparamindex the zero-based numerical index for the parameter to be bound. this will be one less than the number used in the sql (<code>?1</code> maps to <code>0</code>, and so on). return value an autf8string representing the parameter name for the specified index. getparameterindex() obtains the index of the parameter with the specified name. this method was added in 1.9.0. in 1.8.1 you had to use getparameterindexes(). see bug 388048 for details. unsigned long getparameterindex( in autf8string aname ); parameters aname name of the parameter to get the index for. for ...
...And 8 more matches

nsIDocShell
ng on the current docshell. read only. canvashasfocus boolean tells the docshell whether the canvas should have focus. called by the focus manager when the user tabs to the frame rather than an element. obsolete since gecko 1.9.2 channelisunsafe boolean find out if the currently loaded document came from a suspicious channel (such as a jar channel where the server-returned content type is not a known jar type). read only. charset string the converter to use when reading the document's data. in mozilla code, all text is encoded as unicode. when reading a document, a converter is used to translate the text from its original format into unicode. this attribute lets you: see what converter was used when retrieving the document's dat...
...te. note: starting in gecko 8.0, isactive is false for documents in minimized windows. isapptab boolean sets whether a docshell is an app tab. an app tab docshell may behave differently than a non-app tab docshell in some cases, such as when handling link clicks. docshells are not app tabs unless told otherwise. isexecutingonloadhandler boolean returns true if the docshell is currently executing the onload handler. read only. isinunload boolean find out whether the docshell is currently in the middle of a page transition (after the onunload event has fired, but before the new document has been set up) read only. isoffscreenbrowser boolean if true, this docshell is not visible in the traditional sense, but is bein...
...hell. this is set by browser or nswebbrowser for their root docshell. shouldsavelayoutstate boolean indicates whether the current page can be cached. read only. useerrorpages boolean attribute to access whether error pages are enabled. zoom float set/get the document scale factor. when setting this attribute, a ns_error_not_implemented error may be returned by implementations not supporting zoom. implementations not supporting zoom should return 1.0 all the time for the get operation. 1.0 by the way is the default of zoom. this means 100% of normal scaling or in other words normal size no zoom. constants constant value description internal_load_flags_none 0x0 used as a placeholder when you don't want to explicit...
...And 8 more matches

nsILocalFile
h( in astring relativefilepath ); parameters relativefilepath a native relative path. for security reasons, this cannot contain '..' or cannot start with a directory separator '/' . exceptions thrown ns_error_file_unrecognized_path indicates that relativefilepath incorrectly begins with a path separator character or otherwise contains invalid characters. getrelativedescriptor() returns a relative file path in an opaque, cross platform format. it is therefore not a native path. acstring getrelativedescriptor( in nsilocalfile fromfile ); parameters fromfile the file from which the descriptor is relative. there is no defined result if this parameter is null. return value an opaque string value with undefined character encoding. this string is not intended for display ...
...n an opaque, cross platform format. it is therefore not a native path. acstring getrelativedescriptor( in nsilocalfile fromfile ); parameters fromfile the file from which the descriptor is relative. there is no defined result if this parameter is null. return value an opaque string value with undefined character encoding. this string is not intended for display to users. the result returned from this method may be used with setrelativedescriptor() to initialize a nsilocalfile instance. initwithfile() initializes this object with another file. void initwithfile( in nsilocalfile afile ); parameters afile the file this becomes equivalent to. initwithnativepath() used to set the full path that this nsilocalfile references. all current settings will be reset. void initwi...
... a string that specifies a platform-specific, full path to a file or directory. exceptions thrown ns_error_file_unrecognized_path indicates that filepath is not an absolute file path or that it contains characters that are invalid for the filesystem. launch() requests that the operating system attempt to open this file. void launch(); parameters none. native code only! load returns the result of pr_loadlibrary() on the file. the caller is responsible for calling pr_unloadlibrary() on the result. prlibrarystar load(); parameters none. return value a pointer to a prlibrary. example #include "prlink.h" #include "nserror.h" #include "nsilocalfile.h" // load the dll corresponding to the given nsilocalfile... nsresult loaddll(nsilocalfile *alocalfile) { prlibrary *dl...
...And 8 more matches

nsILoginManagerStorage
ssword prompt is being shown. read only. methods addlogin() called by the login manager to store a new login. gecko 1.9.1 note default values for the nsiloginmetainfo properties are created if the specified login doesn't explicitly specify them. void addlogin( in nsilogininfo alogin ); parameters alogin the login to add to the login storage. countlogins() implement this method to return the number of logins matching the specified criteria. this method is called, for example, to check to see if there is a login that will match the criteria without having to ask the user for their master password in order to decrypt the logins. unsigned long countlogins( in astring ahostname, in astring aactionurl, in astring ahttprealm ); parameters ahostname the hostname to which to rest...
...is a login that will match the criteria without having to ask the user for their master password in order to decrypt the logins. unsigned long countlogins( in astring ahostname, in astring aactionurl, in astring ahttprealm ); parameters ahostname the hostname to which to restrict the search. specify an empty string to match all hosts. passing null should not match any logins, and should return 0. aactionurl the url of the form to which the login will be submitted. to match any form login, specify an empty string. to not match to any form login, specify null. ahttprealm the http realm for which the login applies. to match logins for any realm, specify an empty string. to not match any realm, specify null. return value the number of logins that match the specified criteria. findlogins()...
...od to search the login store for logins matching the specified criteria. this method is called by the login manager when looking for saved logins that might apply to a form or authentication request. void findlogins( out unsigned long count, in astring ahostname, in astring aactionurl, in astring ahttprealm, [retval, array, size_is(count)] out nsilogininfo logins ); parameters count return in this parameter the number of matching logins found by the search. ahostname the hostname to which to restrict the search. for example: "http://www.site.com". specify an empty string to match all hosts. passing null should not match any logins, and should return a count of 0. aactionurl the url of the form to which the login will be submitted. to match any form login, specify an empty string. t...
...And 8 more matches

nsIMessenger
in acstring aurl); parameters awin a window. as far as i can tell this isn't used or checked. aurl the url to open. launchexternalurl() launches the nsiexternalprotocolservice and sends it the url. void launchexternalurl(in acstring aurl); parameters aurl the url to open. canundo() queries if there are any undo items in the transaction manager. ...
...e nsiexternalprotocolservice and sends it the url. void launchexternalurl(in acstring aurl); parameters aurl the url to open. canundo() queries if there are any undo items in the transaction manager. boolean canundo(); return value boolean representing whether undo is available. canredo() queries if there are any redo items in the transaction manager. boolean canredo(); return value boolean representing whether redo is available. getundotransactiontype() gets the type of the next undo transaction. unsigned long getundotransactiontype(); return value a long representing the type of the transaction. see #constants for available types. getredotransactiontype() gets the type of the next redo transaction. available types are defined as constants in nsimessen...
...see #constants for available types. undo() performs the next undo transaction. void undo(in nsimsgwindow msgwindow); parameters msgwindow the nsimsgwindow to perform the undo transaction on. ...
...And 8 more matches

nsIScriptableIO
an empty filename string if you wish to get a reference to the directory itself. nsifile getfile( in astring alocation, in astring afilename ); parameters alocation a location key identifying a known standard directory. the afilename parameter is treated as being local to this directory. afilename the relative path of the file to generate a reference for. return value returns an nsifile object referencing the specified file location. exceptions thrown ns_error_invalid_arg alocation was null. getfilewithpath() returns a file reference using an absolute file path to locate the file. note: you should avoid using this method, since file paths are platform-dependent and non-portable. instead, you should use getfile() and construct the path fro...
... to locate the file. note: you should avoid using this method, since file paths are platform-dependent and non-portable. instead, you should use getfile() and construct the path from the base location manually. nsifile getfilewithpath( in astring afilepath ); parameters afilepath the absolute pathname of the file to reference, or the value of a file's persistentdescriptor. return value returns an nsifile object referencing the specified file location. exceptions thrown ns_error_invalid_arg afilepath was null. newuri() creates a uri object that implements the nsiuri interface. nsiuri newuri( in nsivariant auri ); parameters auri the file for which to create a new nsiuri object. this parameter may be specified either as a url string or a...
...e object referencing the specified file location. exceptions thrown ns_error_invalid_arg afilepath was null. newuri() creates a uri object that implements the nsiuri interface. nsiuri newuri( in nsivariant auri ); parameters auri the file for which to create a new nsiuri object. this parameter may be specified either as a url string or as an nsifile object. return value returns an nsiuri object corresponding to the specified string or file. exceptions thrown ns_error_invalid_arg auri was null. newinputstream() retrieves a stream from which data can be read. nsisupports newinputstream( in nsivariant abase, in astring amode, [optional] in astring acharset, [optional] in astring areplacechar, [optional] in unsigned long abuffer...
...And 8 more matches

Int64
d (or may need) values represented using a 64-bit data type. you use the int64 object to create and manipulate 64-bit signed integers. note: it's important to note that the 64-bit integer objects created by int64 are not int64 objects; rather, they're opaque objects whose values you manipulate through the other methods on the int64 object. see 64-bit integers for details. syntax creates and returns a new 64-bit signed integer. int64 int64( value ); parameters value the value to assign the new 64-bit integer object. this may be specified as an integer (if the value can be represented as a 32-bit value), another 64-bit integer object (either signed or unsigned), or as a string, which may consist of an optional minus sign, followed by either a decimal number or "0x" or "0x" followed ...
...er 64-bit integer object (either signed or unsigned), or as a string, which may consist of an optional minus sign, followed by either a decimal number or "0x" or "0x" followed by a hexadecimal number. the string is then converted into the corresponding 64-bit integer value. you can therefore use a string to represent a 64-bit value that is too large to represent as a 32-bit javascript number. return value a new object representing the specified value. exceptions thrown typeerror the specified value cannot be converted into a 64-bit integer. either it's not a number, string, or 64-bit integer object, or it's a string that is incorrectly formatted or contains a value outside the range that can be represented in 64 bits. this will also be thrown if the source value is a floating-point num...
...represented as a 64-bit integer. method overview number compare(a, b); number hi(a); int64 join(high, low); number lo(a); string tosource(); string tostring([radix]); methods compare() compares two 64-bit integer values. number compare( a, b ); parameters a the first value to compare. b the second value to compare. ...
...And 8 more matches

Streams - Plugins
estroystream or the plug-in can call npn_destroystream. this applies to all plug-in modes except np_seek. note: a plug-in can also use the npn_geturl method to request a stream for an arbitrary url. telling the plug-in when a stream is deleted the browser calls the npp_destroystream method when it completes the stream sent to the plug-in, either successfully or abnormally. once the plug-in returns from this method, the browser deletes the npstream object. the plug-in can terminate the stream itself by calling npn_destroystream. you should delete any private data allocated in the plug-in's stream->pdata field when you destroy a stream. the plug-in can store private data associated with the stream in stream->pdata. the browser stores private data in stream->ndata; this value should not be ...
... the instance as it can handle at one time, and it helps both the browser and the plug-in to use their resources efficiently. after a call to npp_newstream, in which the plug-in requested a normal-mode stream, the browser delivers the data in the stream progressively in a series of calls to npp_writeready and npp_write. the browser calls npp_writeready before each call to npp_write. the value returned by npp_writeready indicates how many bytes the plug-in instance can accept for this stream. if the plug-in allocates memory for the entire stream at once, it can return a large number. this number tells the browser that it can pass as much data to the instance as possible in a single call to npp_write. the browser can write a smaller amount of data if desired or necessary (for example, if only ...
...e browser that it can pass as much data to the instance as possible in a single call to npp_write. the browser can write a smaller amount of data if desired or necessary (for example, if only 8k of data is available in a network buffer). for instance, suppose the plug-in allocates, in npp_newstream, an 8k buffer to hold the data written from that stream. ...
...And 8 more matches

KeyboardEvent.getModifierState() - Web APIs
the keyboardevent.getmodifierstate() method returns the current state of the specified modifier key: true if the modifier is active (that is the modifier key is pressed or locked), otherwise, false. syntax var active = event.getmodifierstate(keyarg); returns a boolean parameters keyarg a modifier key value. the value must be one of the keyboardevent.key values which represent modifier keys, or the string "accel" . this is case-sensitive. modifier keys on internet explorer ie9 uses "scroll" for "scrolllock" and "win" for "os". ...
... syntax var active = event.getmodifierstate(keyarg); returns a boolean parameters keyarg a modifier key value. the value must be one of the keyboardevent.key values which represent modifier keys, or the string "accel" . this is case-sensitive. modifier keys on internet explorer ie9 uses "scroll" for "scrolllock" and "win" for "os". ...
... ctrl key, control key or menu key pressed. "fn" not supported function key is pressed, but we're not sure what key makes the modifier state active. fn key on mac keyboard doesn't cause this active. ...
...And 8 more matches

MediaDevices.getUserMedia() - Web APIs
ith tracks containing the requested types of media. that stream can include, for example, a video track (produced by either a hardware or virtual video source such as a camera, video recording device, screen sharing service, and so forth), an audio track (similarly, produced by a physical or virtual audio source like a microphone, a/d converter, or the like), and possibly other track types. it returns a promise that resolves to a mediastream object. if the user denies permission, or matching media is not available, then the promise is rejected with notallowederror or notfounderror respectively. note: it's possible for the returned promise to neither resolve nor reject, as the user is not required to make a choice at all and may simply ignore the request. generally, you will access the med...
...a mediastreamconstraints object specifying the types of media to request, along with any requirements for each type. the constraints parameter is a mediastreamconstraints object with two members: video and audio, describing the media types requested. either or both must be specified. if the browser cannot find all media tracks with the specified types that meet the constraints given, then the returned promise is rejected with notfounderror. the following requests both audio and video without any specific requirements: { audio: true, video: true } if true is specified for a media type, the resulting stream is required to have that type of track in it. if one cannot be included for any reason, the call to getusermedia() will result in an error. while information about a user's cameras ...
...an error. while information about a user's cameras and microphones are inaccessible for privacy reasons, an application can request the camera and microphone capabilities it needs and wants, using additional constraints. ...
...And 8 more matches

RTCPeerConnection.setRemoteDescription() - Web APIs
the rtcpeerconnection method setremotedescription() sets the specified session description as the remote peer's current offer or answer. the description specifies the properties of the remote end of the connection, including the media format. the method takes a single parameter—the session description—and it returns a promise which is fulfilled once the description has been changed, asynchronously. this is typically called after receiving an offer or answer from another peer over the signaling server. keep in mind that if setremotedescription() is called while a connection is already in place, it means renegotiation is underway (possibly to adapt to changing network conditions). because descriptions will be exchanged until the two peers agree on a configuration, the description submitte...
...entation of the sessiondescription parameter is technically of type rtcsessiondescriptioninit, but because rtcsessiondescription serializes to be indistinguishable from rtcsessiondescriptioninit, you can also pass in an rtcsessiondescription. ...
...ondescription serializes to be indistinguishable from rtcsessiondescriptioninit, you can also pass in an rtcsessiondescription. ...
...And 8 more matches

Using XMLHttpRequest - Web APIs
*/ /* dosomething(odata); */ /* console.log("ajaxsubmit - the form is now serialized. submitting..."); */ submitdata (odata); } function pushsegment (ofrevt) { this.owner.segments[this.segmentidx] += ofrevt.target.result + "\r\n"; this.owner.status--; processstatus(this.owner...
...egment (ofrevt) { this.owner.segments[this.segmentidx] += ofrevt.target.result + "\r\n"; this.owner.status--; processstatus(this.owner); } function plainescape (stext) { /* how should i treat a text/plain form encoding? what characters are not allowed? this is what i suppose...: */ /* "4\3\7 - einstein said e=mc2" ----> "4\\3\\7\ -\ einstein\ said\ e\=mc2" */ return stext.replace(/[\s\=\\]/g, "\\$&"); } function submitrequest (otarget) { var nfile, sfieldtype, ofield, osegmreq, ofile, bispost = otarget.method.tolowercase() === "post"; /* console.log("ajaxsubmit - serializing form..."); */ this.contenttype = bispost && otarget.enctype ? otarget.enctype : "application\/x-www-form-urlencoded"; this.technique = bispost ? this.content...
....push( this.technique === 3 ? ...
...And 8 more matches

Implementing a Microsoft Active Accessibility (MSAA) Server - Accessibility
ers marked [important]: objid_alert objid_caret objid_client [important] objid_cursor objid_hscroll objid_nativeom [important? might be useful for supporting custom interfaces, need to research] objid_menu objid_queryclassnameidx objid_sizegrip objid_sound objid_sysmenu objid_titlebar objid_vscroll objid_window [important, but implemented automatically by microsoft windows. will return object of type role_window. see windowfromaccessibleobject quirk explanation below.] dealing with the quirks of msaa msaa has a well deseved reputation for quirkiness. it is not "plug and play", and will take a lot of testing/refinement before your solution works with any product. here are some of it's quirks and some solutions/workarounds: msaa can be crash prone problem: many of msaa's cra...
...ent or ui object it refers to goes away. the easiest way to do that is to keep a pointer to an accessible in each internal ui object. if that pointer is non-null, then there is an accessible object for it. whenever the ui object is destroyed, shutdown it's accessible object as well. in gecko/mozilla we are not allowed to keep this extra pointer for each accessible object, so when accessibility is turned on we use a hash table to cache these objects. such a cache must be kept in perfect sync with the tree of ui and document objects, which is difficult. therefore, unless 4 bytes extra on each object is criticial in your application, just keep the extra pointer around instead of using a hash table. also, don't implement event_object_create or event_object_destroy. vendors have found that watchin...
...an easily happen merely by having two listboxes visible at the same time, because selected listbox items use the system highlight color, even when the listbox itself is not focused. other problems occur when a piece of static text which has the same color background, which will cause that text to be repeated each time the focus or highlight moves. at least one major screen reader has a feature to turn highlight tracking off, but that's only a global setting, and turning off highlight tracking globally also turns off the speaking of menu items. solution: don't use the system highlight color for items that you don't want spoken when the highlight or focus moves. to fix this for standard listboxes, use owner drawn list items, so that you can change the highlight color when an item doesn't have f...
...And 8 more matches

Control flow and error handling - JavaScript
objects—evaluate to true when passed to a conditional statement. ...
...ve boolean values true and false with the true and false values of the boolean object! for example: var b = new boolean(false); if (b) // this condition evaluates to true if (b == true) // this condition evaluates to false example in the following example, the function checkdata returns true if the number of characters in a text object is three. otherwise, it displays an alert and returns false. function checkdata() { if (document.form1.threechar.value.length == 3) { return true; } else { alert( 'enter exactly three characters. ' + `${document.form1.threechar.value} is not valid.`); return false; } } switch statement a switch statement allows a program to evaluate an expression and attempt to match the expression's value to a case label. if a...
...w statement use the throw statement to throw an exception. a throw statement specifies the value to be thrown: throw expression; you may throw any expression, not just expressions of a specific type. the following code throws several exceptions of varying types: throw 'error2'; // string type throw 42; // number type throw true; // boolean type throw {tostring: function() { return "i'm an object!"; } }; note: you can specify an object when you throw an exception. you can then reference the object's properties in the catch block. // create an object type userexception function userexception(message) { this.message = message; this.name = 'userexception'; } // make the exception convert to a pretty string when used as a string // (e.g., by the error console) userexc...
...And 8 more matches

Details of the object model - JavaScript
llowing statement: var mark = new workerbee; when javascript sees the new operator, it creates a new generic object and implicitly sets the value of the internal property [[prototype]] to the value of workerbee.prototype and passes this new object as the value of the this keyword to the workerbee constructor function. the internal [[prototype]] property determines the prototype chain used to return property values. once these properties are set, javascript returns the new object and the assignment statement sets the variable mark to that object. this process does not explicitly put values in the mark object (local values) for the properties that mark inherits from the prototype chain. when you ask for the value of a property, javascript first checks to see if the value exists in that objec...
...if no such property is found, javascript says the object does not have the property. ...
...if no such property is found, javascript says the object does not have the property. ...
...And 8 more matches

Default parameters - JavaScript
r, it's often useful to set a different default value. this is where default parameters can help. in the past, the general strategy for setting defaults was to test parameter values in the function body and assign a value if they are undefined. ...
...efault value. this is where default parameters can help. in the past, the general strategy for setting defaults was to test parameter values in the function body and assign a value if they are undefined. in the following example, if no value is provided for b when multiply is called, b's value would be undefined when evaluating a * b and multiply would return nan. ...
...iply is called, b's value would be undefined when evaluating a * b and multiply would return nan. function multiply(a, b) { return a * b } multiply(5, 2) // 10 multiply(5) // nan ! to guard against this, something like the second line would be used, where b is set to 1 if multiply is called with only one argument: function multiply(a, b) { b = (typeof b !== 'undefined') ? b : 1 return a * b } multiply(5, 2) // 10 multiply(5) // 5 with default parameters in es2015, checks in the function body are no longer necessary. now, you can assign 1 as the default value for b in the function head: function multiply(a, b = 1) { return a * b } multiply(5, 2) // 10 multiply(5) // 5 multiply(5, undefined) // 5 examples passing undefined vs. other falsy val...
...And 8 more matches

Functions - JavaScript
generally speaking, a function is a "subprogram" that can be called by code external (or internal in the case of recursion) to the function. like the program itself, a function is composed of a sequence of statements called the function body. values can be passed to a function, and the function will return a value. in javascript, functions are first-class objects, because they can have properties and methods just like any other object. ...
...have properties and methods just like any other object. what distinguishes them from other objects is that functions can be called. in brief, they are function objects. for more examples and explanations, see also the javascript guide about functions. description every function in javascript is a function object. see function for information on properties and methods of function objects. to return a value other than the default, a function must have a return statement that specifies the value to return. a function without a return statement will return a default value. in the case of a constructor called with the new keyword, the default value is the value of its this parameter. for all other functions, the default return value is undefined. the parameters of a function call are the funct...
...unctions for details): ([param[, param]]) => { statements } param => expression param the name of an argument. zero arguments need to be indicated with (). for only one argument, the parentheses are not required. (like foo => 1) statements or expression multiple statements need to be enclosed in brackets. a single expression requires no brackets. the expression is also the implicit return value of the function. the function constructor note: using the function constructor to create functions is not recommended since it needs the function body as a string which may prevent some js engine optimizations and can also cause other problems. as all other objects, function objects can be created using the new operator: new function (arg1, arg2, ... argn, functionbody) arg1, arg...
...And 8 more matches

Array.prototype.reduceRight() - JavaScript
teractive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. see also array.prototype.reduce() for left-to-right. syntax arr.reduceright(callback(accumulator, currentvalue[, index[, array]])[, initialvalue]) parameters callback function to execute on each value in the array, taking four arguments: accumulator the value previously returned in the last invocation of the callback, or initialvalue, if supplied. (see below.) currentvalue the current element being processed in the array. indexoptional the index of the current element being processed in the array. arrayoptional the array reduceright() was called upon. initialvalueoptional value to use as accumulator to the first call of the callback. if no initial val...
... the index of the current element being processed in the array. arrayoptional the array reduceright() was called upon. initialvalueoptional value to use as accumulator to the first call of the callback. if no initial value is supplied, the last element in the array will be used and skipped. calling reduce or reduceright on an empty array without an initial value creates a typeerror. return value the value that results from the reduction. description reduceright executes the callback function once for each element present in the array, excluding holes in the array, receiving four arguments: the initial value (or value from the previous callback call), the value of the current element, the current index, and the array over which iteration is occurring. the call to the reduceright...
...value was provided, then accumulator will be equal to the last value in the array and currentvalue will be equal to the second-to-last value. if the array is empty and no initialvalue was provided, typeerror would be thrown. ...
...And 8 more matches

Array.prototype.every() - JavaScript
the every() method tests whether all elements in the array pass the test implemented by the provided function. it returns a boolean value. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax arr.every(callback(element[, index[, array]])[, thisarg]) parameters callback a function to test for each element, taking three arguments: element the current element being processed in the array. index optional the index of the current element being processed in the array. ...
...k(element[, index[, array]])[, thisarg]) parameters callback a function to test for each element, taking three arguments: element the current element being processed in the array. index optional the index of the current element being processed in the array. array optional the array every was called upon. thisarg optional a value to use as this when executing callback. ...
...rameters callback a function to test for each element, taking three arguments: element the current element being processed in the array. index optional the index of the current element being processed in the array. array optional the array every was called upon. thisarg optional a value to use as this when executing callback. return value true if the callback function returns a truthy value for every array element. otherwise, false. description the every method executes the provided callback function once for each element present in the array until it finds the one where callback returns a falsy value. if such an element is found, the every method immediately returns false. otherwise, if callback returns a truthy value for all elements, every returns true. cautio...
...And 8 more matches

Array.prototype.filter() - JavaScript
the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax let newarray = arr.filter(callback(element[, index, [array]])[, thisarg]) parameters callback function is a predicate, to test each element of the array. ...
...s a predicate, to test each element of the array. return true to keep the element, false otherwise. it accepts three arguments: element the current element being processed in the array. indexoptional the index of the current element being processed in the array. arrayoptional the array filter was called upon. thisargoptional value to use as this when executing callback. return value a new array with the elements that pass the test. if no elements pass the test, an empty array will be returned. description filter() calls a provided callback function once for each element in an array, and constructs a new array of all the values for which callback returns a value that coerces to true. callback is invoked only for indexes of the array which have assigned values; it is ...
... if (func(t[i], i, t)){ res[c++] = kvalue; } } } } else{ while (++i !== len){ // checks to see if the key was set if (i in this){ kvalue = t[i]; if (func.call(thisarg, t[i], i, t)){ res[c++] = kvalue; } } } } res.length = c; // shrink down array to proper size return res; }; } examples filtering out all small values the following example uses filter() to create a filtered array that has all elements with values less than 10 removed. function isbigenough(value) { return value >= 10 } let filtered = [12, 5, 8, 130, 44].filter(isbigenough) // filtered is [12, 130, 44] find all prime numbers in an array the following example returns all prime numbers ...
...And 8 more matches

Date.parse() - JavaScript
2015-02-31). it is not recommended to use date.parse as until es5, parsing of strings was entirely implementation dependent. there are still many differences in how different hosts parse date strings, therefore date strings should be manually parsed (a library can help if many different formats are to be accommodated). the source for this interactive example is stored in a github repository. ...
...te to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax direct call: date.parse(datestring) implicit call: new date(datestring) parameters datestring a string representing a simplification of the iso 8601 calendar date extended format. (other formats may be used, but results are implementation-dependent.) return value a number representing the milliseconds elapsed since january 1, 1970, 00:00:00 utc and the date obtained by parsing the given string representation of a date. if the argument doesn't represent a valid date, nan is returned. description the parse() method takes a date string (such as "2011-10-10t14:48:00") and returns the number of milliseconds since january 1, 1970, 00:00:00 utc. this f...
...rm), "2011-10-10t14:48:00" (date-time form), or "2011-10-10t14:48:00.000+09:00" (date-time form with milliseconds and time zone) can be passed and will be parsed. when the time zone offset is absent, date-only forms are interpreted as a utc time and date-time forms are interpreted as local time. while time zone specifiers are used during date string parsing to interpret the argument, the value returned is always the number of milliseconds between january 1, 1970 00:00:00 utc and the point in time represented by the argument or nan. because parse() is a static method of date, it is called as date.parse() rather than as a method of a date instance. fall-back to implementation-specific date formats this section contains implementation-specific behavior that can be inconsistent across impleme...
...And 8 more matches

Int16Array - JavaScript
in the platform byte order. if control over byte order is needed, use dataview instead. the contents are initialized to 0. once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation). constructor int16array() creates a new int16array object. static properties int16array.bytes_per_element returns a number value of the element size. 2 in the case of an int16array. int16array.name returns the string value of the constructor name. in the case of the int16array type: "int16array". static methods int16array.from() creates a new int16array from an array-like or iterable object. see also array.from(). int16array.of() creates a new int16array with a variable number of arguments. see al...
...int16array.name returns the string value of the constructor name. in the case of the int16array type: "int16array". static methods int16array.from() creates a new int16array from an array-like or iterable object. see also array.from(). int16array.of() creates a new int16array with a variable number of arguments. see also array.of(). instance properties int16array.prototype.buffer returns the arraybuffer referenced by the int16array fixed at construction time and thus read only. int16array.prototype.bytelength returns the length (in bytes) of the int16array from the start of its arraybuffer. fixed at construction time and thus read only. int16array.prototype.byteoffset returns the offset (in bytes) of the int16array from the start of its arraybuffer. fixed at construction tim...
...t construction time and thus read only. int16array.prototype.bytelength returns the length (in bytes) of the int16array from the start of its arraybuffer. fixed at construction time and thus read only. int16array.prototype.byteoffset returns the offset (in bytes) of the int16array from the start of its arraybuffer. fixed at construction time and thus read only. int16array.prototype.length returns the number of elements hold in the int16array. fixed at construction time and thus read only. instance methods int16array.prototype.copywithin() copies a sequence of array elements within the array. see also array.prototype.copywithin(). int16array.prototype.entries() returns a new array iterator object that contains the key/value pairs for each index in the array. see also array.prototy...
...And 8 more matches

Int32Array - JavaScript
in the platform byte order. if control over byte order is needed, use dataview instead. the contents are initialized to 0. once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation). constructor int32array() creates a new int32array object. static properties int32array.bytes_per_element returns a number value of the element size. 4 in the case of an int32array. int32array.name returns the string value of the constructor name. in the case of the int32array type: "int32array". static methods int32array.from() creates a new int32array from an array-like or iterable object. see also array.from(). int32array.of() creates a new int32array with a variable number of arguments. see al...
...int32array.name returns the string value of the constructor name. in the case of the int32array type: "int32array". static methods int32array.from() creates a new int32array from an array-like or iterable object. see also array.from(). int32array.of() creates a new int32array with a variable number of arguments. see also array.of(). instance properties int32array.prototype.buffer returns the arraybuffer referenced by the int32array fixed at construction time and thus read only. int32array.prototype.bytelength returns the length (in bytes) of the int32array from the start of its arraybuffer. fixed at construction time and thus read only. int32array.prototype.byteoffset returns the offset (in bytes) of the int32array from the start of its arraybuffer. fixed at construction tim...
...t construction time and thus read only. int32array.prototype.bytelength returns the length (in bytes) of the int32array from the start of its arraybuffer. fixed at construction time and thus read only. int32array.prototype.byteoffset returns the offset (in bytes) of the int32array from the start of its arraybuffer. fixed at construction time and thus read only. int32array.prototype.length returns the number of elements hold in the int32array. fixed at construction time and thus read only. instance methods int32array.prototype.copywithin() copies a sequence of array elements within the array. see also array.prototype.copywithin(). int32array.prototype.entries() returns a new array iterator object that contains the key/value pairs for each index in the array. see also array.prototy...
...And 8 more matches

Int8Array - JavaScript
the int8array typed array represents an array of twos-complement 8-bit signed integers. the contents are initialized to 0. once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation). constructor int8array() creates a new int8array object. static properties int8array.bytes_per_element returns a number value of the element size. 1 in the case of an int8array. int8array.name returns the string value of the constructor name. in the case of the int8array type: "int8array". static methods int8array.from() creates a new int8array from an array-like or iterable object. see also array.from(). int8array.of() creates a new int8array with a variable number of arguments. see also array.of...
...array. int8array.name returns the string value of the constructor name. in the case of the int8array type: "int8array". static methods int8array.from() creates a new int8array from an array-like or iterable object. see also array.from(). int8array.of() creates a new int8array with a variable number of arguments. see also array.of(). instance properties int8array.prototype.buffer returns the arraybuffer referenced by the int8array fixed at construction time and thus read only. int8array.prototype.bytelength returns the length (in bytes) of the int8array from the start of its arraybuffer. fixed at construction time and thus read only. int8array.prototype.byteoffset returns the offset (in bytes) of the int8array from the start of its arraybuffer. fixed at construction time and...
...xed at construction time and thus read only. int8array.prototype.bytelength returns the length (in bytes) of the int8array from the start of its arraybuffer. fixed at construction time and thus read only. int8array.prototype.byteoffset returns the offset (in bytes) of the int8array from the start of its arraybuffer. fixed at construction time and thus read only. int8array.prototype.length returns the number of elements hold in the int8array. fixed at construction time and thus read only. instance methods int8array.prototype.copywithin() copies a sequence of array elements within the array. see also array.prototype.copywithin(). int8array.prototype.entries() returns a new array iterator object that contains the key/value pairs for each index in the array. see also array.prototype.
...And 8 more matches

Comparing Reflect and Object methods - JavaScript
although some of the methods appear to be similar in their behavior, there are often subtle differences between them. the table below details the differences between the methods available on the object and reflect apis. please note that if a method does not exist in an api, it is marked as n/a. ...
...n their behavior, there are often subtle differences between them. the table below details the differences between the methods available on the object and reflect apis. please note that if a method does not exist in an api, it is marked as n/a. method name object reflect defineproperty() object.defineproperty() returns the object that was passed to the function. returns a typeerror if the property was not successfully defined on the object. reflect.defineproperty() returns true if the property was defined on the object and false if it was not. defineproperties() object.defineproperties() returns the objects that were passed to the function. returns a typeerror if any properties were not successfully defined on the object. n/a set() ...
...perty was not successfully defined on the object. reflect.defineproperty() returns true if the property was defined on the object and false if it was not. defineproperties() object.defineproperties() returns the objects that were passed to the function. returns a typeerror if any properties were not successfully defined on the object. n/a set() n/a reflect.set() returns true if the property was set successfully on the object and false if it was not. throws a typeerror if the target was not an object. get() n/a reflect.get() returns the value of the property. throws a typeerror if the target was not an object. ...
...And 8 more matches

Symbol - JavaScript
a symbol value may be used as an identifier for object properties; this is the data type's primary purpose, although other use-cases exist, such as enabling opaque data types, or serving as an implementation-supported unique identifier in general. ...
... a symbol value may be used as an identifier for object properties; this is the data type's primary purpose, although other use-cases exist, such as enabling opaque data types, or serving as an implementation-supported unique identifier in general. ...
...sing the symbol() function will not create a global symbol that is available in your whole codebase. to create symbols available across files and even across realms (each of which has its own global scope), use the methods symbol.for() and symbol.keyfor() to set and retrieve symbols from the global symbol registry. finding symbol properties on objects the method object.getownpropertysymbols() returns an array of symbols and lets you find symbol properties on a given object. note that every object is initialized with no own symbol properties, so that this array will be empty unless you've set symbol properties on the object. constructor symbol() creates a new symbol object. it is incomplete as a constructor because it does not support the syntax "new symbol()". static properties sym...
...And 8 more matches

TypedArray - JavaScript
fer, and optionally a byteoffset and a length argument, a new typed array view is created that views the specified arraybuffer. the byteoffset and length parameters specify the memory range that will be exposed by the typed array view. if both are omitted, all of buffer is viewed; if only length is omitted, the remainder of buffer is viewed. static properties typedarray.bytes_per_element returns a number value of the element size for the different typedarray objects. typedarray.name returns the string value of the constructor name (e.g, "int8array"). get typedarray[@@species] the constructor function used to create derived objects. typedarray.prototype prototype for typedarray objects. static methods typedarray.from() creates a new typedarray from an array-like or iterable o...
...] the constructor function used to create derived objects. typedarray.prototype prototype for typedarray objects. static methods typedarray.from() creates a new typedarray from an array-like or iterable object. see also array.from(). typedarray.of() creates a new typedarray with a variable number of arguments. see also array.of(). instance properties typedarray.prototype.buffer returns the arraybuffer referenced by the typed array. fixed at construction time and thus read only. typedarray.prototype.bytelength returns the length (in bytes) of the typed array. fixed at construction time and thus read only. typedarray.prototype.byteoffset returns the offset (in bytes) of the typed array from the start of its arraybuffer. fixed at construction time and thus read only. typedar...
...nced by the typed array. fixed at construction time and thus read only. typedarray.prototype.bytelength returns the length (in bytes) of the typed array. fixed at construction time and thus read only. typedarray.prototype.byteoffset returns the offset (in bytes) of the typed array from the start of its arraybuffer. fixed at construction time and thus read only. typedarray.prototype.length returns the number of elements held in the typed array. fixed at construction time and thus read only. instance methods typedarray.prototype.copywithin() copies a sequence of array elements within the array. see also array.prototype.copywithin(). typedarray.prototype.entries() returns a new array iterator object that contains the key/value pairs for each index in the array. see also array.protot...
...And 8 more matches

Uint16Array - JavaScript
the platform byte order. if control over byte order is needed, use dataview instead. the contents are initialized to 0. once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation). constructor uint16array() creates a new uint16array object. static properties uint16array.bytes_per_element returns a number value of the element size. 2 in the case of an uint16array. uint16array.name returns the string value of the constructor name. in the case of the uint16array type: "uint16array". static methods uint16array.from() creates a new uint16array from an array-like or iterable object. see also array.from(). uint16array.of() creates a new uint16array with a variable number of arguments...
...ray.name returns the string value of the constructor name. in the case of the uint16array type: "uint16array". static methods uint16array.from() creates a new uint16array from an array-like or iterable object. see also array.from(). uint16array.of() creates a new uint16array with a variable number of arguments. see also array.of(). instance properties uint16array.prototype.buffer returns the arraybuffer referenced by the uint16array fixed at construction time and thus read only. uint16array.prototype.bytelength returns the length (in bytes) of the uint16array from the start of its arraybuffer. fixed at construction time and thus read only. uint16array.prototype.byteoffset returns the offset (in bytes) of the uint16array from the start of its arraybuffer. fixed at constructio...
...struction time and thus read only. uint16array.prototype.bytelength returns the length (in bytes) of the uint16array from the start of its arraybuffer. fixed at construction time and thus read only. uint16array.prototype.byteoffset returns the offset (in bytes) of the uint16array from the start of its arraybuffer. fixed at construction time and thus read only. uint16array.prototype.length returns the number of elements hold in the uint16array. fixed at construction time and thus read only. instance methods uint16array.prototype.copywithin() copies a sequence of array elements within the array. see also array.prototype.copywithin(). uint16array.prototype.entries() returns a new array iterator object that contains the key/value pairs for each index in the array. see also array.prot...
...And 8 more matches

Uint32Array - JavaScript
the platform byte order. if control over byte order is needed, use dataview instead. the contents are initialized to 0. once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation). constructor uint32array() creates a new uint32array object. static properties uint32array.bytes_per_element returns a number value of the element size. 4 in the case of an uint32array. uint32array.name returns the string value of the constructor name. in the case of the uint32array type: "uint32array". static methods uint32array.from() creates a new uint32array from an array-like or iterable object. see also array.from(). uint32array.of() creates a new uint32array with a variable number of arguments...
...ray.name returns the string value of the constructor name. in the case of the uint32array type: "uint32array". static methods uint32array.from() creates a new uint32array from an array-like or iterable object. see also array.from(). uint32array.of() creates a new uint32array with a variable number of arguments. see also array.of(). instance properties uint32array.prototype.buffer returns the arraybuffer referenced by the uint32array fixed at construction time and thus read only. uint32array.prototype.bytelength returns the length (in bytes) of the uint32array from the start of its arraybuffer. fixed at construction time and thus read only. uint32array.prototype.byteoffset returns the offset (in bytes) of the uint32array from the start of its arraybuffer. fixed at constructio...
...struction time and thus read only. uint32array.prototype.bytelength returns the length (in bytes) of the uint32array from the start of its arraybuffer. fixed at construction time and thus read only. uint32array.prototype.byteoffset returns the offset (in bytes) of the uint32array from the start of its arraybuffer. fixed at construction time and thus read only. uint32array.prototype.length returns the number of elements hold in the uint32array. fixed at construction time and thus read only. instance methods uint32array.prototype.copywithin() copies a sequence of array elements within the array. see also array.prototype.copywithin(). uint32array.prototype.entries() returns a new array iterator object that contains the key/value pairs for each index in the array. see also array.prot...
...And 8 more matches

Uint8Array - JavaScript
the uint8array typed array represents an array of 8-bit unsigned integers. the contents are initialized to 0. once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation). constructor uint8array() creates a new uint8array object. static properties uint8array.bytes_per_element returns a number value of the element size. 1 in the case of an uint8array. uint8array.name returns the string value of the constructor name. in the case of the uint8array type: "uint8array". static methods uint8array.from() creates a new uint8array from an array-like or iterable object. see also array.from(). uint8array.of() creates a new uint8array with a variable number of arguments. see also array.of()...
...uint8array.name returns the string value of the constructor name. in the case of the uint8array type: "uint8array". static methods uint8array.from() creates a new uint8array from an array-like or iterable object. see also array.from(). uint8array.of() creates a new uint8array with a variable number of arguments. see also array.of(). instance properties uint8array.prototype.buffer returns the arraybuffer referenced by the uint8array fixed at construction time and thus read only. uint8array.prototype.bytelength returns the length (in bytes) of the uint8array. fixed at construction time and thus read only. uint8array.prototype.byteoffset returns the offset (in bytes) of the uint8array from the start of its arraybuffer. fixed at construction time and thus read only. uint8array.
...ferenced by the uint8array fixed at construction time and thus read only. uint8array.prototype.bytelength returns the length (in bytes) of the uint8array. fixed at construction time and thus read only. uint8array.prototype.byteoffset returns the offset (in bytes) of the uint8array from the start of its arraybuffer. fixed at construction time and thus read only. uint8array.prototype.length returns the number of elements held in the uint8array. fixed at construction time and thus read only. instance methods uint8array.prototype.copywithin() copies a sequence of array elements within the array. see also array.prototype.copywithin(). uint8array.prototype.entries() returns a new array iterator object that contains the key/value pairs for each index in the array. see also array.prototy...
...And 8 more matches

parseInt() - JavaScript
the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax parseint(string [, radix]) parameters string the value to parse. if this argument is not a string, then it is converted to one using the tostring abstract operation. leading whitespace in this argument is ignored. radix optional an integer between 2 and 36 that represents the radix (the base in mathematical numeral systems) of the string. ...
...ment is not a string, then it is converted to one using the tostring abstract operation. leading whitespace in this argument is ignored. radix optional an integer between 2 and 36 that represents the radix (the base in mathematical numeral systems) of the string. be careful—this does not default to 10! the description below explains in more detail what happens when radix is not provided. ...
...default to 10! the description below explains in more detail what happens when radix is not provided. return value an integer parsed from the given string. or nan when the radix is smaller than 2 or bigger than 36, or the first non-whitespace character cannot be converted to a number. description the parseint function converts its first argument to a string, parses that string, then returns an integer or nan. if not nan, the return value will be the integer that is the first argument taken as a number in the specified radix. (for example, a radix of 10 converts from a decimal number, 8 converts from octal, 16 from hexadecimal, and so on.) for radices above 10, letters of the english alphabet indicate numerals greater than 9. for example, for hexadecimal numbers (base 16), a throu...
...And 8 more matches

in operator - JavaScript
the in operator returns true if the specified property is in the specified object or its prototype chain. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax prop in object parameters prop a string or symbol representing a property name or array index (non-symbols will be coerced to strings). object object to check if it (or its prototype chain) contains the property with specified name (prop). examples basic usage the following examples show some uses of the in operator. ...
...ers prop a string or symbol representing a property name or array index (non-symbols will be coerced to strings). object object to check if it (or its prototype chain) contains the property with specified name (prop). examples basic usage the following examples show some uses of the in operator. ...
...presenting a property name or array index (non-symbols will be coerced to strings). object object to check if it (or its prototype chain) contains the property with specified name (prop). examples basic usage the following examples show some uses of the in operator. ...
...And 8 more matches

context-menu - Archive of obsolete content
ttern strings. when matchpattern is an array, the context occurs when the menu is invoked on a page whose url matches any of the patterns. these are the same match pattern strings that you use with the page-mod include property. read more about patterns. predicatecontext(predicatefunction) predicatefunction is called when the menu is invoked, and the context occurs when the function returns a true value. the function is passed an object with properties describing the menu invocaton context. array an array of any of the other types. this context occurs when all contexts in the array occur. menu items also have a context property that can be used to add and remove declarative contexts after construction. for example: var context = require("sdk/context-menu").selec...
...ontent scripts. like other apis in the sdk, the context-menu api uses content scripts to let your add-on interact with pages in the browser. each menu item you create in the top-level context menu can have a content script. a special event named "context" is emitted in your content scripts whenever the context menu is about to be shown. ...
...this is the node in the page that the user context-clicked to invoke the menu. you can use it to determine whether your item should be shown. you can both specify declarative contexts and listen for contexts in a content script. ...
...And 7 more matches

io/file - Archive of obsolete content
indows-style paths, be sure to escape backslashes in strings. for example, to specify the file at c:\users\myk, you need to use the string "c:\\users\\myk", not "c:\users\myk". read more about escaping characters in strings. globals functions basename(path) the path parameter must be an absolute path, relative paths will cause an error. use the fs/path module for relative path support. returns the last component of the given path. for example, basename("/foo/bar/baz") returns "baz". if the path has no components, the empty string is returned. parameters path : string the path of a file. returns string : the last component of the given path. dirname(path) returns the path of the directory containing the given file. if the file is at the top of the volume, the empty string is ret...
...ame("/foo/bar/baz") returns "baz". if the path has no components, the empty string is returned. parameters path : string the path of a file. returns string : the last component of the given path. dirname(path) returns the path of the directory containing the given file. if the file is at the top of the volume, the empty string is returned. parameters path : string the path of a file. returns string : the path of the directory containing the file. exists(path) returns true if a file exists at the given path and false otherwise. parameters path : string the path of a file. returns boolean : true if the file exists and false otherwise. join(...) takes a variable number of strings, joins them on the file system's path separator, and returns the result. parameters ... : strin...
...f a file exists at the given path and false otherwise. parameters path : string the path of a file. returns boolean : true if the file exists and false otherwise. join(...) takes a variable number of strings, joins them on the file system's path separator, and returns the result. parameters ... : strings a variable number of strings to join. the first string must be an absolute path. returns string : a single string formed by joining the strings on the file system's path separator. list(path) returns an array of file names in the given directory. parameters path : string the path of the directory. returns array : an array of file names. each is a basename, not a full path. mkpath(path) makes a new directory named by the given path. any subdirectories that do not exist are ...
...And 7 more matches

Appendix E: DOM Building and Insertion (HTML & XUL) - Archive of obsolete content
without risk of remote execution. json templating jsontodom.namespaces = { html: "http://www.w3.org/1999/xhtml", xul: "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" }; jsontodom.defaultnamespace = jsontodom.namespaces.html; function jsontodom(jsontemplate, doc, nodes) { function namespace(name) { var reelemnameparts = /^(?:(.*):)?(.*)$/.exec(name); return { namespace: jsontodom.namespaces[reelemnameparts[1]], shortname: reelemnameparts[2] }; } // note that 'elemnameorarray' is: either the full element name (eg. [html:]div) or an array of elements in json notation function tag(elemnameorarray, elemattr) { // array of elements? parse each one... if (array.isarray(elemnameorarray)) { var frag = doc.createdocu...
...eg. [html:]div) or an array of elements in json notation function tag(elemnameorarray, elemattr) { // array of elements? parse each one... if (array.isarray(elemnameorarray)) { var frag = doc.createdocumentfragment(); array.foreach(arguments, function(thiselem) { frag.appendchild(tag.apply(null, thiselem)); }); return frag; } // single element? parse element namespace prefix (if none exists, default to defaultnamespace), and create element var elemns = namespace(elemnameorarray); var elem = doc.createelementns(elemns.namespace || jsontodom.defaultnamespace, elemns.shortname); // set element's attributes and/or callback functions (eg. onclick) for (var key in el...
...event listeners can be defined on the given nodes by passing functions rather than strings to on* attributes: var href = "http://www.google.com/"; var text = "google"; var nodes = {}; document.documentelement.appendchild( jsont...
...And 7 more matches

Browser Detection and Cross Browser Support - Archive of obsolete content
users of netscape 6, netscape 7, compuserve 7, mozilla, opera will not be able to view the site properly. misidentifying browsers a common mistake web authors make is to assume that if a browser is not netscape navigator 4, it must be internet explorer and vice versa. for example: // wrong approach - do not use! if (document.all) { // internet explorer 4+ elm = docum...
... <frameset rows="30,*"> <frame src="foo.html"> <frame src="bar.html"> <noframes> <body> <p> this page requires frames. see <a href="noframes.html">sitemap</a>. </p> </body> </noframes> </frameset> </html> using noscript to support non-scriptable browsers some browsers may not support scripting while some users may have scripting support turned off in their browser. use the noscript tag to provide these users with alternative unscripted versions of your pages or to at least notify them of the need to use scripting in order to view your content properly. since browsers such as netscape navigator 4 and internet explorer 4 do not support some of the most recent additions to the javascript (ecmascript) standard, it is often necessary to ...
...ur content properly. since browsers such as netscape navigator 4 and internet explorer 4 do not support some of the most recent additions to the javascript (ecmascript) standard, it is often necessary to limit the use of advanced javascript features such as exception processing. one approach is to require that users of browsers which do not support the level of javascript used in your content to turn off javascript in order to be able to use your content. you can do this by providing an error message for users of older browsers as well as alternative content contained in noscript tags. <html> <head> <title>noscript</title> </head> <body> <script language="javascript"> window.onerror = function () { // redirect user to a page describing the limitations ...
...And 7 more matches

Parsing microformats in JavaScript - Archive of obsolete content
ally retrieves a date from a microformat node. after getting the text, it is normalized into an iso 8601 date. normalizeddate = microformats.parser.datetimegetter(propnode, parentnode); parameters propnode the dom node to check. parentnode the property's parent node. if it is a subproperty, this is the parent property node. otherwise this is the microformat node. return value a string containing the normalized date. defaultgetter() uses the microformat patterns to decide what the correct text for a given microformat property is. this includes looking at thing such as abbr, img and alt, area and alt, and value excerpting. propertyvalue = microformats.parser.defaultgetter(propnode, parentnode, datatype); parameters propnode the dom node to check...
....parser.defaultgetter(propnode, parentnode, datatype); parameters propnode the dom node to check. parentnode the property's parent node. if it is a subproperty, this is the parent property node. otherwise this is the microformat node. datatype "html" if the search should be done using innerhtml(), or "text" to use innertext(). the default is "text". return value a string containing the property's value. emailgetter() specifically retrieves an email address from a microformat node. this removes the subject if one is specified, as well as the mailto: prefix. email = microformats.parser.emailgetter(propnode, parentnode); parameters propnode the dom node to check. parentnode the property's parent node. if it is a subproper...
...eves an email address from a microformat node. this removes the subject if one is specified, as well as the mailto: prefix. email = microformats.parser.emailgetter(propnode, parentnode); parameters propnode the dom node to check. parentnode the property's parent node. if it is a subproperty, this is the parent property node. otherwise this is the microformat node. ...
...And 7 more matches

Client-side storage - Learn web development
useful. the storage.setitem() method allows you to save a data item in storage — it takes two parameters: the name of the item, and its value. try typing this into your javascript console (change the value to your own name, if you wish!): localstorage.setitem('name','chris'); the storage.getitem() method takes one parameter — the name of a data item you want to retrieve — and returns the item's value. now type these lines into your javascript console: let myname = localstorage.getitem('name'); myname upon typing in the second line, you should see that the myname variable now contains the value of the name data item. the storage.removeitem() method takes one parameter — the name of a data item you want to remove — and removes that item out of web storage. type...
...d see that the myname variable now contains the value of the name data item. the storage.removeitem() method takes one parameter — the name of a data item you want to remove — and removes that item out of web storage. type the following lines into your javascript console: localstorage.removeitem('name'); let myname = localstorage.getitem('name'); myname the third line should now return null — the name item no longer exists in the web storage. the data persists! one key feature of web storage is that the data persists between page loads (and even when the browser is shut down, in the case of localstorage). let's look at this in action. open our web storage blank template again, but this time in a different browser to the one you've got this tutorial open in! this wi...
...calstorage). let's look at this in action. open our web storage blank template again, but this time in a different browser to the one you've got this tutorial open in! this will make it easier to deal with. type these lines into the browser's javascript console: localstorage.setitem('name','chris'); let myname = localstorage.getitem('name'); myname you should see the name item returned. now close down the browser and open it up again. enter the following lines again: let myname = localstorage.getitem('name'); myname you should see that the value is still available, even though the browser has been closed and then opened again. separate storage for each domain there is a separate data store for each domain (each separate web address loaded in the browser...
...And 7 more matches

Third-party APIs - Learn web development
able). the api key, which has to be specified in the api-key url parameter (the value is taken from the key variable). the page number, which has to be specified in the page url parameter (the value is taken from the pagenumber variable). the search term, which has to be specified in the q url parameter (the value is taken from the value of the searchterm text <input>). the document type to return results for, as specified in an expression passed in via the fq url parameter. in this case, we want to return articles. next, we use a couple of if() statements to check whether the startdate and enddate <input>s have had values filled in on them. if they do, we append their values to the url, specified in begin_date and end_date url parameters respectively. so, a complete url would end up lo...
...rs (pattern="[0-9]{8}"). see form data validation for more details on how these work. requesting data from the api now we've constructed our url, let's make a request to it. we'll do this using the fetch api. add the following code block inside the fetchresults() function, just above the closing curly brace: // use fetch() to make the request to the api fetch(url).then(function(result) { return result.json(); }).then(function(json) { displayresults(json); }); here we run the request by passing our url variable to fetch(), convert the response body to json using the json() function, then pass the resulting json to the displayresults() function so the data can be displayed in our ui. displaying the data ok, let's look at how we'll display the data. add the following function below yo...
...esults() function. ...
...And 7 more matches

Useful string methods - Learn web development
ed to know about most of these early on in your learning journey. but there are a few that you'll potentially use quite often that we'll look at here. let's enter some examples into the browser developer console. finding the length of a string this is easy — you simply use the length property. ...
... should return the number 7, because "mozilla" is 7 characters long. this is useful for many reasons; for example, you might want to find the lengths of a series of names so you can display them in order of length, or let a user know that a username they have entered into a form field is too long if it is over a certain length. retrieving a specific string character on a related note, you can return any character inside a string by using square bracket notation — this means you include square brackets ([]) on the end of your variable name. ...
...ow that a username they have entered into a form field is too long if it is over a certain length. retrieving a specific string character on a related note, you can return any character inside a string by using square bracket notation — this means you include square brackets ([]) on the end of your variable name. inside the square brackets you include the number of the character you want to return, so for example to retrieve the first letter you'd do this: browsertype[0]; remember: computers count from 0, not 1! you could use this to, for example, find the first letter of a series of strings and order them alphabetically. to retrieve the last character of any string, we could use the following line, combining this technique with the length property we looked at above: browsertype[brows...
...And 7 more matches

React interactivity: Editing, filtering, conditional rendering - Learn web development
for editing the name of a task yet. we'll get to that in a moment. to start with, we can at least implement an edittask() function in app.js. it’ll be similar to deletetask() because it'll take an id to find its target object, but it'll also take a newname property containing the name to update the task to. ...
...rray.prototype.filter() because we want to return a new array with some changes, instead of deleting something from the array. ...
......
...And 7 more matches

Introduction to automated testing - Learn web development
dule: use a task runner such as grunt or gulp, or npm scripts to run tests and clean up code during your build process. this is a great way to perform tasks like linting and minifying code, adding in css prefixes or transpiling nascent javascript features for maximum cross-browser reach, and so on. use a browser automation system like selenium to run specific tests on installed browsers and return results, alerting you to failures in browsers as they crop up. commercial cross-browser testing apps like lambdatest, sauce labs, browserstack, and testingbot are based on selenium, but allow you to access their set up remotely using a simple interface, saving you the hassle of setting up your own testing system. we will look at how to set up your own selenium-based testing system in the next a...
... your own selenium-based testing system in the next article. in this article, we'll look at how to set up a task runner, and use the basic functionality of commercial systems like the ones mentioned above. note: the above two categories are not mutually exclusive. it is possible to set up a task runner to access a service like sauce labs, or lambdatest via an api, run cross browser tests, and return results. we will look at this below as well. using a task runner to automate testing tools as we said above, you can drastically speed up common tasks such as linting and minifying code by using a task runner to run everything you need to run automatically at a certain point in your build process. for example, this could be every time you save a file, or at some other point. inside this sectio...
... site. (if you already have node and npm installed, jump to point 4) install it like you would any other program. note that node comes with node package manager (npm), which allows you to easily install packages, share your own packages with others, and run useful scripts on your projects. once the install completes, test that node is installed by typing the following into the terminal, which returns the installed versions of node and npm: node -v npm -v if you've got node/npm already installed, you should update them to their latest versions. to update node, the most reliable way is to download and install an updated installer package from their website (see link above). to update npm, use the following command in your terminal: npm install npm@latest -g note: if the above comma...
...And 7 more matches

JNI.jsm
cdata getforthread(); cdata loadclass(cdata ajenv, string aclassfullyqualifiedname, [optional] object adeclares); cdata newstring(cdata ajenv, string astr); string readstring(cdata ajenv, cdata ajavastring); void unloadclasses(); methods getforthread() blah blah cdata getforthread(); parameters this function does not take any arguments. return value blah blah loadclass() blah blah cdata loadclass( ajenv, afullyqualifiedname, [optional] object adeclares ); parameters ajenv the return value of getforthread(). afullyqualifiedname a sig of a typed array or the name of the class that would be used in a signature, but without the surrounding l and ;. if it is the sig of a typed array such as '[i' then adeclares must not be...
.../gecko/geckoappshell" and for geckointerface we would use "org/mozilla/gecko/geckoappshell$geckointerface". adeclares optional if this is omitted, then afullyqualifiedname must be an array type. if this is provided, then afullyqualifiedname must be a class name. a required object that contains up to five fields of key names: constructors, fields, static_fields, methods, and static_methods. return value blah blah newstring() blah blah cdata newstring( ajenv, astr ); parameters ajenv the return value of getforthread(). astr a javascript string, use any encoding desired. return value blah blah readstring() blah blah string readstring( ajenv, ajavastring ); parameters ajenv the return value of getforthread(). ajavastring a cdata object that is a java string. re...
... value blah blah newstring() blah blah cdata newstring( ajenv, astr ); parameters ajenv the return value of getforthread(). astr a javascript string, use any encoding desired. return value blah blah readstring() blah blah string readstring( ajenv, ajavastring ); parameters ajenv the return value of getforthread(). ajavastring a cdata object that is a java string. return value a javascript string. unloadclasses() blah blah void unloadclasses(); parameters this function takes no arguments. return value this function has no return value, if you try to store the return value in a variable, it will be undefined. working with arrays creating/preallocating a typed array methods cdata .get(number aindex); cdata .getelements(number astart...
...And 7 more matches

Hacking Tips
with their description. note that some functions have been moved under an 'os' object, and help(os) will give brief help on just the members of that "namespace". getting the bytecode of a function (from js shell) the shell has a small function named dis to dump the bytecode of a function with its source notes. without arguments, it will dump the bytecode of its caller. ...
...object, and help(os) will give brief help on just the members of that "namespace". getting the bytecode of a function (from js shell) the shell has a small function named dis to dump the bytecode of a function with its source notes. without arguments, it will dump the bytecode of its caller. js> function f () { return 1; } js> dis(f); flags: loc op ----- -- main: 00000: one 00001: return 00002: stop source notes: ofs line pc delta desc args ---- ---- ----- ------ -------- ------ 0: 1 0 [ 0] newline 1: 2 0 [ 0] colspan 2 3: 2 2 [ 2] colspan 9 getting the bytecode of a function (from gdb) in jsopcode.cpp, a function named js::disassembleatpc can print the bytecode of a script. some variants of this function such as js::dumpscript et...
...he ins->id() of the lir instruction can be added to select precisely the instruction you are looking for. once the breakpoint is on codegenerator function of the lir instruction, add a command to generate a static breakpoint in the generated code. $ gdb --args js […] (gdb) b js::ion::codegenerator::visitstart (gdb) command >call masm.breakpoint() >continue >end (gdb) r js> function f(a, b) { return a + b; } js> for (var i = 0; i < 100000; i++) f(i, i + 1); breakpoint 1, js::ion::codegenerator::visitstart (this=0x101ed20, lir=0x10234e0) at /home/nicolas/mozilla/ionmonkey/js/src/ion/codegenerator.cpp:609 609 } program received signal sigtrap, trace/breakpoint trap. 0x00007ffff7fb165a in ?? () (gdb) once you hit the generated breakpoint, you can replace it by a gdb breakpoint to ...
...And 7 more matches

Introduction to the JavaScript shell
redirect stdout to file. js_stderr=file redirect stderr to file. built-in functions to make the javascript shell more useful, there are a number of built-in functions provided that you can use either from javascript programs or in interactive mode. note: this list is incomplete and overlaps with shell global objects. see js/src/shell/js.cpp (around shell_functions) for more. build() returns the date and time at which the javascript shell was built. note: clear() with no parameters really clears everything. this includes all these built-in functions. clone(function, [scope]) clones the specified function object. if scope isn't specified, the new object's parent is the same as the original object's. otherwise, the new object is placed in the scope of the object specified by scope.
...ed in spidermonkey 1.8 dump the graph of all existing objects (or a specific interesting subgraph) to a file. for more information, see the c/c++ version of this function, js_dumpheap. evalcx(string[, object]) evaluates the javascript code in string. if object is specified, the code is executed in that object, treating it as a sandbox. if string is empty and object is not specified, evalcx() returns a new object with eager standard classes. if string is "lazy" and object is not specified, evalcx() returns a new object with lazy standard classes. note: evalcx() is only useful for people doing deep internal work on the javascript engine, for testing evalinsandbox-like environments in the shell. gc() runs the garbage collector to free up memory. gcparam(name[, value]) added in spidermonk...
...runs the garbage collector to free up memory. gcparam(name[, value]) added in spidermonkey 1.8 read or configure garbage collector parameters. the name must be one of the parameter keys (such as 'maxbytes', 'maxmallocbytes' or 'gcnumber') defined by for_each_gc_param in https://searchfox.org/mozilla-central/source/js/src/builtin/testingfunctions.cpp#464. if value is not specified, gcparam() returns the current value associated with gc parameter named name. if value is specified, it must be convertable to a positive uint32; gcparam() sets gc parameter name to value. for more information, see the c/c++ functions js_getgcparameter and js_setgcparameter. gczeal(level) added in spidermonkey 1.8 debug only. set the level of gc zeal, a debugging feature. this can be 0 for normal periodic gar...
...And 7 more matches

JIT Optimization Strategies
riables, as long as those variables cannot be accessed by any nested function, and as long as there exists no eval anywhere within the function or nested function definitions. call a function using f.apply(obj, arguments) if the function contains any use of the arguments object that falls out of the cases defined above, this optimization will be suppressed. in particular, arguments cannot be returned from the function, or passed as an argument into calls (except for the apply case above). getprop_argumentscallee attempts to optimize an arguments.callee property access. this optimization only works if the arguments object is used in well-understood ways within the function. the function containing the arguments.callee is allowed to use the arguments object in the following ways without dis...
...riables, as long as those variables cannot be accessed by any nested function, and as long as there exists no eval anywhere within the function or nested function definitions. call a function using f.apply(obj, arguments) if the function contains any use of the arguments object that falls out of the cases defined above, this optimization will be suppressed. in particular, arguments cannot be returned from the function, or passed as an argument into calls (except for the apply example listed above). getprop_inferredconstant attempts to optimize an access to a property that seems to be a constant. it applies to property accesses on objects which are global-like in that there is only one instance of them per program. this includes global objects, object literals defined at the top-level of a...
...timization makes the assumption that a property that has not changed after it was first assigned, is likely a constant property. it then directly inlines the value of the property into hot code that accesses it. for example, in the following code: var constants = {}; constants.n = 100; function testarray(array) { for (var i = 0; i < array.length; i++) { if (array[i] > constants.n) return true; } return false; } will have the loop compiled into the following when testarray gets hot. for (var i = 0; i < array.length; i++) { if (array[i] > 100) return true; } when this optimization is successful, property access is eliminated entirely and replaced with an inline constant. getprop_constant attempts to optimize reading a property that contains a uniquely-typed (or "si...
...And 7 more matches

JS::CompileOptions
known); name type description cx jscontext * pointer to a js context from which to derive runtime information. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. version jsversion javascript version used to compile the script. methods some methods of js::owningcompileoptions and js::compileoptions return the instance itself to allow method chain. methods of js::readonlycompileoptions method description bool mutederrors() const determines if errors are muted. the web platform allows scripts to be loaded from arbitrary cross-origin sources. this allows an attack by which a malicious website loads a sensitive file (say, a bank statement) cross-origin (using the us...
...) for juicy morsels of its contents. to counter this attack, html5 specifies that script errors should be sanitized ("muted") when the script is not same-origin with the global for which it is loaded. callers should set this flag for cross-origin scripts, and it will be propagated appropriately to child scripts and passed back in jserrorreports. ...
...cript errors should be sanitized ("muted") when the script is not same-origin with the global for which it is loaded. callers should set this flag for cross-origin scripts, and it will be propagated appropriately to child scripts and passed back in jserrorreports. const char *filename() const returns filename of the source code. const char *introducerfilename() const returns filename of the file which introduces the file. const char16_t *sourcemapurl() const returns the url of the source map. methods of js::owningcompileoptions method description jsobject *element() const returns the dom element to which this source code belongs, if any, or null if it belongs to no dom element. source belongs to a dom element in the f...
...And 7 more matches

NS ConvertASCIItoUTF16 external
parameters prunichar** begin prunichar** end prunichar* beginreading() const - source endreading prunichar* endreading() const - source charat prunichar charat(pruint32) const - source parameters pruint32 apos ...
... pruint32 apos first prunichar first() const - source beginwriting pruint32 beginwriting(prunichar**, prunichar**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters prunichar** begin prunichar** end pruint32 newsize prunichar* beginwriting(pruint32) - source parameters pruint32 <anonymous> endwriting prunichar* endwriting() - source setlength prbool setlength(pruint32) - sourc...
...equalsliteral prbool lowercaseequalsliteral(const char*) const - source case-insensitive match this string to a lowercase ascii string. parameters char* aasciistring find print32 find(const nsastring&, print32 (*)(const prunichar*, const prunichar*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 7 more matches

NS ConvertUTF8toUTF16 external
parameters prunichar** begin prunichar** end prunichar* beginreading() const - source endreading prunichar* endreading() const - source charat prunichar charat(pruint32) const - source parameters pruint32 apos ...
... pruint32 apos first prunichar first() const - source beginwriting pruint32 beginwriting(prunichar**, prunichar**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters prunichar** begin prunichar** end pruint32 newsize prunichar* beginwriting(pruint32) - source parameters pruint32 <anonymous> endwriting prunichar* endwriting() - source setlength prbool setlength(pruint32) - sourc...
...equalsliteral prbool lowercaseequalsliteral(const char*) const - source case-insensitive match this string to a lowercase ascii string. parameters char* aasciistring find print32 find(const nsastring&, print32 (*)(const prunichar*, const prunichar*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 7 more matches

PromiseFlatString (External)
parameters prunichar** begin prunichar** end prunichar* beginreading() const - source endreading prunichar* endreading() const - source charat prunichar charat(pruint32) const - source parameters pruint32 apos ...
... pruint32 apos first prunichar first() const - source beginwriting pruint32 beginwriting(prunichar**, prunichar**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters prunichar** begin prunichar** end pruint32 newsize prunichar* beginwriting(pruint32) - source parameters pruint32 <anonymous> endwriting prunichar* endwriting() - source setlength prbool setlength(pruint32) - sourc...
...equalsliteral prbool lowercaseequalsliteral(const char*) const - source case-insensitive match this string to a lowercase ascii string. parameters char* aasciistring find print32 find(const nsastring&, print32 (*)(const prunichar*, const prunichar*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 7 more matches

nsAutoString (External)
parameters prunichar** begin prunichar** end prunichar* beginreading() const - source endreading prunichar* endreading() const - source charat prunichar charat(pruint32) const - source parameters pruint32 apos ...
... pruint32 apos first prunichar first() const - source beginwriting pruint32 beginwriting(prunichar**, prunichar**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters prunichar** begin prunichar** end pruint32 newsize prunichar* beginwriting(pruint32) - source parameters pruint32 <anonymous> endwriting prunichar* endwriting() - source setlength prbool setlength(pruint32) - sourc...
...equalsliteral prbool lowercaseequalsliteral(const char*) const - source case-insensitive match this string to a lowercase ascii string. parameters char* aasciistring find print32 find(const nsastring&, print32 (*)(const prunichar*, const prunichar*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 7 more matches

nsCStringContainer (External)
(*) rfind(const nsacstring&, print32, print32 (*) rfind(const char*, print32 (*) rfind(const char*, print32, print32 (*) findchar rfindchar appendint tointeger base classes nsacstring data members no public members. methods beginreading pruint32 beginreading(const char**, const char**) const - source returns the length, beginning, and end of a string in one operation. parameters char* begin char* end char beginreading() const - source endreading char endreading() const - source charat char charat(pruint32) const - source parameters pruint32 apos operator[] ch...
...meters pruint32 apos first char first() const - source beginwriting pruint32 beginwriting(char**, char**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters char* begin char* end pruint32 newsize char beginwriting(pruint32) - source parameters pruint32 alen endwriting char endwriting() - source setlength prbool setlength(pruint32) - source parameters ...
...urce parameters char other equalsliteral prbool equalsliteral(const char*) const - source parameters char other find(const nsacstring&, print32 (*) print32 find(const nsacstring&, print32 (*)(const char*, const char*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 7 more matches

nsDependentString external
parameters prunichar** begin prunichar** end prunichar* beginreading() const - source endreading prunichar* endreading() const - source charat prunichar charat(pruint32) const - source parameters pruint32 apos ...
... pruint32 apos first prunichar first() const - source beginwriting pruint32 beginwriting(prunichar**, prunichar**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters prunichar** begin prunichar** end pruint32 newsize prunichar* beginwriting(pruint32) - source parameters pruint32 <anonymous> endwriting prunichar* endwriting() - source setlength prbool setlength(pruint32) - sourc...
...equalsliteral prbool lowercaseequalsliteral(const char*) const - source case-insensitive match this string to a lowercase ascii string. parameters char* aasciistring find print32 find(const nsastring&, print32 (*)(const prunichar*, const prunichar*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 7 more matches

nsStringContainer (External)
operator>= operator> operator!= equalsliteral lowercaseequalsliteral find rfind findchar rfindchar appendint tointeger base classes nsastring data members no public members. methods beginreading pruint32 beginreading(const prunichar**, const prunichar**) const - source returns the length, beginning, and end of a string in one operation. parameters prunichar** begin prunichar** end prunichar* beginreading() const - source endreading prunichar* endreading() const - source charat prunichar charat(pruint32) const - source parameters pruint32 apos ...
... pruint32 apos first prunichar first() const - source beginwriting pruint32 beginwriting(prunichar**, prunichar**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters prunichar** begin prunichar** end pruint32 newsize prunichar* beginwriting(pruint32) - source parameters pruint32 <anonymous> endwriting prunichar* endwriting() - source setlength prbool setlength(pruint32) - sourc...
...equalsliteral prbool lowercaseequalsliteral(const char*) const - source case-insensitive match this string to a lowercase ascii string. parameters char* aasciistring find print32 find(const nsastring&, print32 (*)(const prunichar*, const prunichar*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 7 more matches

nsString external
parameters prunichar** begin prunichar** end prunichar* beginreading() const - source endreading prunichar* endreading() const - source charat prunichar charat(pruint32) const - source parameters pruint32 apos ...
... pruint32 apos first prunichar first() const - source beginwriting pruint32 beginwriting(prunichar**, prunichar**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters prunichar** begin prunichar** end pruint32 newsize prunichar* beginwriting(pruint32) - source parameters pruint32 <anonymous> endwriting prunichar* endwriting() - source setlength prbool setlength(pruint32) - sourc...
...equalsliteral prbool lowercaseequalsliteral(const char*) const - source case-insensitive match this string to a lowercase ascii string. parameters char* aasciistring find print32 find(const nsastring&, print32 (*)(const prunichar*, const prunichar*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 7 more matches

IAccessibleHyperlink
gested that implementations should not rely on the inheritance. method overview [propget] hresult anchor([in] long index, [out] variant anchor ); [propget] hresult anchortarget([in] long index, [out] variant anchortarget ); [propget] hresult endindex([out] long index ); [propget] hresult startindex([out] long index ); [propget] hresult valid([out] boolean valid ); methods anchor() returns an object that represents the link anchor, as appropriate for the link at the specified index. [propget] hresult anchor( [in] long index, [out] variant anchor ); parameters index a 0 based index identifies the anchor when, as in the case of an image map, there is more than one link represented by this object. the valid maximal index is indicated by iaccessibleaction.nactions(). anchor this...
...d index. [propget] hresult anchor( [in] long index, [out] variant anchor ); parameters index a 0 based index identifies the anchor when, as in the case of an image map, there is more than one link represented by this object. the valid maximal index is indicated by iaccessibleaction.nactions(). anchor this is an implementation dependent value. ...
...n, as in the case of an image map, there is more than one link represented by this object. the valid maximal index is indicated by iaccessibleaction.nactions(). anchor this is an implementation dependent value. for example, for a text link this method could return the substring of the containing string where the substring is overridden with link behavior, and for an image link this method could return an iunknown variant for iaccessibleimage. see the section about. return value e_invalidarg if bad [in] passed, [out] value is null. s_false if there is nothing to return, [out] value is null. s_ok. anchortarget() returns an object representing the target of the link, as appropriate for the link at the specified index. [propget] hresult anchortarget( [in] long index, [out] variant anchortarge...
...And 7 more matches

nsIDOMWindowInternal
mstring btoa(in domstring abase64data) nsivariant showmodaldialog(in nsivariant aargs, [optional] in domstring aoptions) void postmessage(in domstring message, in domstring targetorigin) attributes attribute type description window nsidomwindowinternal readonly: the window object itself. ...
...nal] in domstring aoptions) void postmessage(in domstring message, in domstring targetorigin) attributes attribute type description window nsidomwindowinternal readonly: the window object itself. self nsidomwindowinternal readonly: returns an object reference to the window object. navigator nsidomnavigator readonly: returns a reference to the navigator object. ...
...rgetorigin) attributes attribute type description window nsidomwindowinternal readonly: the window object itself. self nsidomwindowinternal readonly: returns an object reference to the window object. navigator nsidomnavigator readonly: returns a reference to the navigator object. screen nsidomscreen readonly: returns a reference to the screen object associated with the window. history nsidomhistory readonly: returns a reference to the history object, which provides an interface for manipulating the browser session history. content nsidomwindow readonly: returns a window object for the primary content window. prompter nsiprompt readonly: menubar nsid...
...And 7 more matches

nsIEditorSpellCheck
nitspellchecker(); void updatecurrentdictionary(); methods addwordtodictionary() adds the specified word to the current personal dictionary. void addwordtodictionary( in wstring word ); parameters word the word to add to the current personal dictionary. canspellcheck() determines whether or not spell checking can be enabled. boolean canspellcheck(); parameters none. return value returns true if spell checking can be enabled. if there are no available dictionaries, the return value is false. checkcurrentdictionary() call this after any change in installed dictionaries to ensure that the spell checker is not using a current dictionary which is no longer available. if the current dictionary is no longer available, pick another dictionary. void checkcurrentdictionary()...
...urrentdictionary() call this after any change in installed dictionaries to ensure that the spell checker is not using a current dictionary which is no longer available. if the current dictionary is no longer available, pick another dictionary. void checkcurrentdictionary(); parameters none. checkcurrentword() checks a given word. in spite of the name, this function checks the word you give it, returning true if the word is misspelled. if the word is misspelled, it will compute the suggestions which you can get from getsuggestedword(). boolean checkcurrentword( in wstring suggestedword ); parameters suggestedword missing description return value true if the specified word is misspelled; otherwise false. checkcurrentwordnosuggest() like checkcurrentword(), checks the word you give ...
...ue if the word is misspelled. if the word is misspelled, it will compute the suggestions which you can get from getsuggestedword(). boolean checkcurrentword( in wstring suggestedword ); parameters suggestedword missing description return value true if the specified word is misspelled; otherwise false. checkcurrentwordnosuggest() like checkcurrentword(), checks the word you give it, returning true if it is misspelled. this is faster than checkcurrentword() because it does not compute any suggestions. ...
...And 7 more matches

nsIEffectiveTLDService
public suffixes, and the list of them is the public suffix list, or psl. see publicsuffix.org for more information. the methods below implement the public suffix algorithm in full, including the implicit "*" rule. therefore, if you call getpublicsuffix("a.b.c.nonexistent"), you will get back "nonexistent" - this "tld" is not in the public suffix list, but the implicit "*" rule means that it is returned. this is the right answer for e.g. cookie setting and domain highlighting, but you should check whether it's the right answer for your application. it is not recommended to use this interface for determining whether a given string "is a domain name". that question is unanswerable with 100% accuracy using the psl, because what is a domain name is a property of the dns, which is different for di...
... it's not dynamically updated data). ...
... exceptions thrown ns_error_invalid_arg this exception is thrown if the hostname in auri is empty. ...
...And 7 more matches

nsIHttpChannel
e referrer uri is rejected. exceptions thrown ns_error_in_progress if set after the channel has been opened. ns_error_failure if used for setting referrer during visitrequestheaders(). getting the value will not throw. requestmethod acstring set or get the http request method (default is "get"). setter is case insensitive; getter returns an uppercase string. this attribute may only be set before the channel is opened. note: the data for a "post" or "put" request can be configured via nsiuploadchannel. however, after setting the upload data, it may be necessary to set the request method explicitly. the documentation for nsiuploadchannel has further details. exceptions thrown ns_error_in_progres...
...the data for a "post" or "put" request can be configured via nsiuploadchannel. however, after setting the upload data, it may be necessary to set the request method explicitly. the documentation for nsiuploadchannel has further details. exceptions thrown ns_error_in_progress if set after the channel has been opened. requestsucceeded boolean returns true if the http response code indicates success. the value of nsirequest.status() will be ns_ok even when processing a 404 file not found response because such a response may include a message body that (in some cases) should be shown to the user. use this attribute to distinguish server error pages from normal pages, instead of comparing the response status manually against the set of valid re...
... onstartrequest()). responsestatus unsigned long get the http response code (for example 200). read only. exceptions thrown ns_error_not_available if called before the response has been received (before onstartrequest()). responsestatustext acstring get the http response status text (for example "ok"). note: this returns the raw (possibly 8-bit) text from the server. there are no assumptions made about the charset of the returned text. you have been warned! read only. exceptions thrown ns_error_not_available if called before the response has been received (before onstartrequest()). referrerpolicy read only unsigned long the referrer policy in use for this ...
...And 7 more matches

nsIIOService
when in offline mode, attempts to access the network will fail (although this does not necessarily correlate with whether there is actually a network available -- that's hard to detect without causing the dialer to come up). observers will be notified of changes to this attribute. methods allowport() checks if a port number is banned. this involv...
...'s decision to block the port. this gives the protocol handler ultimate control over its own security policy while ensuring reasonable, default protection. is similar to nsiprotocolhandler.allowport(). boolean allowport( in long aport, in string ascheme ); parameters aport the port to check ascheme the scheme for the protocol handler that could override the ioservice's decision. return value true if the port is allowed, false otherwise. extractscheme() utility to extract the scheme from a url string, consistently and according to spec (see rfc 3986). note: most url parsing is done via nsiuri, and in fact the scheme can also be extracted from a url string via nsiuri. this method is provided purely as an optimization. acstring extractscheme( in autf8string urlstring ); ...
...o extract the scheme from a url string, consistently and according to spec (see rfc 3986). note: most url parsing is done via nsiuri, and in fact the scheme can also be extracted from a url string via nsiuri. this method is provided purely as an optimization. acstring extractscheme( in autf8string urlstring ); parameters urlstring the string for the url to extract the scheme from. ...
...And 7 more matches

nsIInputStream
tes available in the stream. in addition to the number of bytes available in the stream, this method also informs the caller of the current status of the stream. a stream that is closed will throw an exception when this method is called. that enables the caller to know the condition of the stream before attempting to read from it. if a stream is at end-of-file, but not closed, then this method returns 0 bytes available. note: some nsiinputstream implementations automatically close() when end-of-file is reached; others do not. note: this method should not be used to determine the total size of a stream, even if the stream corresponds to a local file. moreover, since a stream may make available more than 2^32 bytes of data, this method is incapable of expressing the entire size of the under...
...atically close() when end-of-file is reached; others do not. note: this method should not be used to determine the total size of a stream, even if the stream corresponds to a local file. moreover, since a stream may make available more than 2^32 bytes of data, this method is incapable of expressing the entire size of the underlying data source. unsigned long available(); parameters none. ...
... native code only!read this method copies data from the stream into a buffer. ...
...And 7 more matches

nsIMsgDBView
); parameters folder the nsimsgfolder to open. sorttype a nsmsgviewsorttypevalue designating the sort type used for the folder. defined in the interface: nsmsgviewsorttype. sortorder an nsmsgviewsortordervalue designating the sort order used for the folder. defined in the interface: nsmsgviewsortorder. viewflags other flags to be used. defined in the interface: nsmsgviewflagstype. return values count upon return, the count variable may contain the number of messages in the folder. note: this return value does not appear to be implemented in the base implementation. openwithhdrs() opens the view with a set of specified headers. note: this is not implemented in the base implementation. void openwithhdrs(in nsisimpleenumerator aheaders, in nsmsgviewsortt...
...eaders to open, arranged in an nsisimpleenumerator. asorttype a nsmsgviewsorttypevalue designating the sort type used for the folder. defined in the interface: nsmsgviewsorttype. sortorder an nsmsgviewsortordervalue designating the sort order used for the folder. defined in the interface: nsmsgviewsortorder. viewflags other flags to be used. defined in the interface: nsmsgviewflagstype. return values acount upon return, the count variable may contain the number of messages loaded. close() close the current list of messages. void close(); init() initializes the database view for use. void init(in nsimessenger amessengerinstance, in nsimsgwindow amsgwindow, in nsimsgdbviewcommandupdater acommandupdater); parameters amessengerinstance amsgwindow ...
...tus of a particular command. used by the thunderbird ui to determine if the command is available. void getcommandstatus(in nsmsgviewcommandtypevalue command, out boolean selectable_p, out nsmsgviewcommandcheckstatevalue selected_p); parameters command the nsmsgviewcommandtypevalue to perform. defined in the interface: nsmsgviewcommandtype. return values selectable_p the state of the command. true if it is enabled. false if it is disabled. selected_p the returned check state of the command. defined in the interface: nsmsgviewcommandcheckstate. this is not used for all commands and will return the notused value most of the time. viewnavigate() change the view to show a particular message. this method will automatically expand the d...
...And 7 more matches

nsINavHistoryService
7 this transition type is set when the transition is a download. transition_framed_link 8 this transition type is set when the user followed a link that loaded a page in a frame. methods getpagetitle() this method retrieves the original title of the page. astring getpagetitle( in nsiuri auri ); parameters auri the page whose title needs to be retrieved. return value returns the original title of the page. markpageasfollowedbookmark() this method is just like markpageastyped (in nsibrowserhistory, also implemented by the history service), but for bookmarks. it declares that the given uri is being opened as a result of following a bookmark. if this uri is loaded soon after this message has been received, that transition will be marked as following a b...
...ne whether it will be or not. you don't have to worry about calling this, addpagetosession/adduri will always check before actually adding the page. this function is public because some components may want to check if this page would go in the history (that is for annotations). boolean canadduri( in nsiuri auri ); parameters auri the uri that needs to be added to the history system. return value returns true if this uri would be added to the history, otherwise returns false. addvisit() obsolete since gecko 22.0 (firefox 22.0 / thunderbird 22.0 / seamonkey 2.19) note: this method was removed in gecko 22.0. you should use the new async api moziasynchistory.updateplaces() instead. see this code for how a function to add visits and handle errors using the ...
...f transition: one of transition_* defined above. aisredirect true if the given visit redirects to somewhere else (that is you will create a visit out of here that is a redirect transition). this causes this page to be hidden in normal history views (unless it has been unhidden by visiting it with a non-redirect). asessionid the session id that this page belongs to. use "0" for no session. ...
...And 7 more matches

nsIWindowsRegKey
read only. key hkey this attribute exposes the native hkey and is available to provide c++ consumers with the flexibility of making other windows registry api calls that are not exposed via this interface. it is possible to initialize this object by setting an hkey on it. in that case, it is the responsibility of the consumer setting the hkey to ...
...ity of making other windows registry api calls that are not exposed via this interface. it is possible to initialize this object by setting an hkey on it. in that case, it is the responsibility of the consumer setting the hkey to ensure that it is a valid hkey. warning: setting the key does not close() the old key. native code only! valuecount unsigned long this attribute returns the number of values under this key. read only. constants root key constants the values for these keys correspond to the values from winreg.h in the ms platform sdk. the root_key_ prefix corresponds to the hkey_ prefix in the ms platform sdk. this interface is not restricted to using only these root keys. constant value description root_key_classes_root 0x8000000...
...e consulted for the exact meaning of these value types. this interface is somewhat restricted to using only these value types. there is no method that is directly equivalent to regqueryvalueex or regsetvalueex. in particular, this interface does not support the reg_multi_sz and reg_expand_sz value types. it is still possible to enumerate values that have other types (that is, getvaluetype() may return a type not defined below). constant value description type_none 0 reg_none type_string 1 reg_sz type_binary 3 reg_binary type_int 4 reg_dword type_int64 11 reg_qword methods close() this method closes the key. if the key is already closed, then this method does nothing. void close(); parameters none. ...
...And 7 more matches

Working with data
tions that you can use to create new cdata objects of that type. there are several ways you can go about creating new cdata objects. creating uninitialized cdata objects there are three forms of the syntax for creating cdata objects without immediately assigning them a value: var mycdataobj = new type; var mycdataobj = new type(); var mycdataobj = type(); these all do the same thing: they return a new cdata object of the specified type, whose data buffer has been populated entirely with zeroes. note: if type.size is undefined, creating a new object this way will throw a typeerror exception. creating initialized cdata objects similarly, you can initialize cdata objects with specific values at the type of creation by specifying them as a parameter when calling the ctype's constructor, l...
...llowing steps are taken: if the value is a size value, a new array of that length is created, with its cells ready to accept values of the same type as those in the specified array. this is the same as new arraytype(type.elementtype, value). if the type represents a javascript string (that is, an array of jschar characters followed by a null terminator), a copy of that string is created and returned. if the type is an array of 8-bit characters and value is a utf-16 string, the new cdata object is the result of converting the utf-16 string to utf-8, with a null terminator. if the value is a javascript array object and it has a non-negative length, a new array is created and the contents of the array specified by value are converted to cdata objects and copied into the new array, which is ...
... the type is an array of 8-bit characters and value is a utf-16 string, the new cdata object is the result of converting the utf-16 string to utf-8, with a null terminator. if the value is a javascript array object and it has a non-negative length, a new array is created and the contents of the array specified by value are converted to cdata objects and copied into the new array, which is then returned. if none of these conditions are met, a typeerror is thrown. if type is ctypes.void_t, a typeerror is thrown. example: creating an array let arraytype = ctypes.arraytype(ctypes.int32_t); let myarray = new arraytype(5); at this point, myarray.length is 5; there are 5 entries in the array. myarray.constructor.size is 20; the total size of the array's data buffer is 20 bytes (5 entries, 4 b...
...And 7 more matches

Using js-ctypes
l the ctypes.open() method to load each native library you wish to use. on windows, for example, you might load the system user32 library like this: var lib = ctypes.open("user32.dll"); on mac os x, you can load the core foundation library from the core foundation framework like this: var corefoundation = ctypes.open("/system/library/frameworks/corefoundation.framework/corefoundation"); the returned object is a library object that you use to declare functions and data types for use with the loaded library. note: js-ctypes only works with c libraries; you can't use c++ methods directly. instead, you'll need to create a shim library that uses c functions that then call into the c++ library for you. examples can be found here: bugzilla :: bug 505907 - support c++ calling from jsctypes libra...
...("user32.dll"); or even without the extension. var lib = ctypes.open("user32"); calling carbon routines on mac os x this example demonstrates how to use ctypes to call a carbon function on mac os x. ...
...on makestr(str) { return string.fromcharcode(str.length) + str; } components.utils.import("resource://gre/modules/ctypes.jsm"); var carbon = ctypes.open("/system/library/frameworks/carbon.framework/carbon"); stdalert = carbon.declare("standardalert", /* function name */ ctypes.default_abi, /* abi type */ ctypes.int16_t, /* return type */ ctypes.int16_t, /* alert type */ ctypes.char.ptr, /* primary text */ ctypes.char.ptr, /* secondary text */ ctypes.uint32_t, /* alert param */ ctypes.int16_t); /* item hit */ var hit = 0; var msgerr = makestr("carbon says..."); va...
...And 7 more matches

Using Fetch - Web APIs
e network. this kind of functionality was previously achieved using xmlhttprequest. fetch provides a better alternative that can be easily used by other technologies such as service workers. fetch also provides a single logical place to define other http-related concepts such as cors and extensions to http. the fetch specification differs from jquery.ajax() in three main ways: the promise returned from fetch() won’t reject on http error status even if the response is an http 404 or 500. instead, it will resolve normally (with ok status set to false), and it will only reject on network failure or if anything prevented the request from completing. fetch() won't can receive cross-site cookies; you can’t can establish a cross site session using fetch. set-cookie headers from other sites...
...1.0b13.) a basic fetch request is really simple to set up. have a look at the following code: fetch('http://example.com/movies.json') .then(response => response.json()) .then(data => console.log(data)); here we are fetching a json file across the network and printing it to the console. the simplest use of fetch() takes one argument — the path to the resource you want to fetch — and returns a promise containing the response (a response object). this is just an http response, not the actual json. to extract the json body content from the response, we use the json() method (defined on the body mixin, which is implemented by both the request and response objects.) note: the body mixin also has similar methods to extract other types of body content; see the body section for more. ...
...n' // 'content-type': 'application/x-www-form-urlencoded', }, redirect: 'follow', // manual, *follow, error referrerpolicy: 'no-referrer', // no-referrer, *no-referrer-when-downgrade, origin, origin-when-cross-origin, same-origin, strict-origin, strict-origin-when-cross-origin, unsafe-url body: json.stringify(data) // body data type must match "content-type" header }); return response.json(); // parses json response into native javascript objects } postdata('https://example.com/answer', { answer: 42 }) .then(data => { console.log(data); // json data parsed by `data.json()` call }); note that mode: "no-cors" only allows a limited set of headers in the request: accept accept-language content-language content-type with a value of application/x-www-form-u...
...And 7 more matches

Using the Payment Request API - Web APIs
s the total payment amount, tax, shipping cost, etc. options (optional) — an object containing addtional options related to the payment. ...
...the payment. ...
...ed inside the constructor simply return the required object parameters: function buildsupportedpaymentmethoddata() { // example supported payment methods: return [{ supportedmethods: 'basic-card', data: { supportednetworks: ['visa', 'mastercard'], supportedtypes: ['debit', 'credit'] } }]; } function buildshoppingcartdetails() { // hardcoded for demo purposes: return { id: 'order-123', displayitems: [ { label: 'example item', amount: {currency: 'usd', value: '1.00'} } ], total: { label: 'total', amount: {currency: 'usd', value: '1.00'} } }; } starting the payment process once the paymentrequest object has been created, you call the paymentrequest.show() method on it to initiate the payment reques...
...And 7 more matches

Range - Web APIs
that can contain nodes and parts of text nodes. a range can be created by using the document.createrange() method. range objects can also be retrieved by using the getrangeat() method of the selection object or the caretrangefrompoint() method of the document object. there also is the range() constructor available. properties there are no inherited properties. range.collapsed read only returns a boolean indicating whether the range's start and end points are at the same position. range.commonancestorcontainer read only returns the deepest node that contains the startcontainer and endcontainer nodes. range.endcontainer read only returns the node within which the range ends. range.endoffset read only returns a number representing where in the endcontainer the range ends. range...
... methods there are no inherited methods. ...
... methods there are no inherited methods. range.setstart() sets the start position of a range. range.setend() sets the end position of a range. ...
...And 7 more matches

Using the Resource Timing API - Web APIs
t and requeststart, respectively), until the response has ended (responseend). this timing data provides a detailed profile of the resource loading phases and this data can be used to help identify performance bottlenecks. ...
...ormance support if (performance === undefined) { console.log("= calculate load times: performance not supported"); return; } // get a list of "resource" performance entries var resources = performance.getentriesbytype("resource"); if (resources === undefined || resources.length <= 0) { console.log("= calculate load times: there are no `resource` performance records"); return; } console.log("= calculate load times"); for (var i=0; i < resources.length; i++) { console.log("== resource[" + i + "] - " + resources[i].name); // redirect time var t = resources[i].redirectend - resources[i].redirectstart; console.log("... redirect time = " + t); // dns time t = resources[i].domainlookupend - resources[i].domainlookupstart; console.log("...
..... start until response end time = " + t); } } resource size measurements the size of an application's resources can affect an application's performance so getting accurate data on resource size can be important (especially for non-hosted resources). the performanceresourcetiming interface has three properties that can be used to obtain size data about a resource. ...
...And 7 more matches

Resource Timing API - Web APIs
ce page, using the resource timing api, and the references in the see also section. for a graphical representation of the resource timing processing model see the resource timing phases figure. the performanceresourcetiming interface extends the performanceentry for performance entries which have an entrytype of "resource". high-resolution timestamps several of the resource timing properties return high-resolution timestamps. these timestamps have a domhighrestimestamp type and as its name implies, they represent a high-resolution point in time. this type is a double and its value is a discrete point in time or the difference in time between two discrete points in time. the unit of domhighrestimestamp is milliseconds and should be accurate to 5 µs (microseconds). however, if the browser i...
... if the browser is unable to provide a time value accurate to 5 µs (because, for example, due to hardware or software constraints), the browser can represent a the value as a time in milliseconds accurate to a millisecond. resource loading timestamps an application can get timestamps for the various stages used to load a resource. the first property in the processing model is starttime which returns the timestamp immediately before the resource loading process begins. the fetchstart timestamps follows and redirect processing (if applicable) and preceeds dns lookup. the next stages are connectstart and connectend which are the timestamps immediately before and after connecting to the server, respectively. the last three timestamps are, in order: requeststart - the timestamp before the browse...
...ver; responsestart - the timestamp after the browser receives the first byte of the response from the server; and responseend - the timestamp after the browser receives the last byte of the resource. if the resource is loaded via a secure connection a secureconnectionstart timestamp will be available between the connection start and end events. ...
...And 7 more matches

SVGPathElement - Web APIs
parent, svggeometryelement. svgpathelement.pathlength an svganimatednumber corresponding to the pathlength attribute of the given <path> element. note: in svg 2 this property was moved to the svggeometryelement interface, from which this interface inherits it. methods this interface also inherits methods from its parent, svggeometryelement. ...
...metryelement. svgpathelement.gettotallength() returns a float representing the computed value for the total length of the path using the browser's distance-along-a-path algorithm, as a distance in the current user coordinate system. note: in svg 2 this method was moved to the svggeometryelement interface, from which this interface inherits it. svgpathelement.getpointatlength() returns an svgpoint representing the x and y coordinates in user space utilizing the browser's distance-along-a-path algorithm. note: in svg 2 this method was moved to the svggeometryelement interface, from which this interface inherits it. ...
...e svggeometryelement interface, from which this interface inherits it. svgpathelement.getpointatlength() returns an svgpoint representing the x and y coordinates in user space utilizing the browser's distance-along-a-path algorithm. note: in svg 2 this method was moved to the svggeometryelement interface, from which this interface inherits it. svgpathelement.getpathsegatlength() returns an unsigned long representing the index within the pathseglist utilizing the user agent's distance-along-a-path algorithm. svgpathelement.createsvgpathsegclosepath() returns a stand-alone, parentless svgpathsegclosepath object. ...
...And 7 more matches

Matrix math for the web - Web APIs
the 2nd column, then add together let resulty = (x * c1r0) + (y * c1r1) + (z * c1r2) + (w * c1r3); // multiply the point against each part of the 3rd column, then add together let resultz = (x * c2r0) + (y * c2r1) + (z * c2r2) + (w * c2r3); // multiply the point against each part of the 4th column, then add together let resultw = (x * c3r0) + (y * c3r1) + (z * c3r2) + (w * c3r3); return [resultx, resulty, resultz, resultw]; } now using the function above we can multiply a point by the matrix. using the identity matrix it should return a matrix identical to the original, since a matrix multiplied by the identity matrix is always equal to itself: // sets identityresult to [4,3,2,1] let identityresult = multiplymatrixandpoint(identitymatrix, [4, 3, 2, 1]); returning the same p...
...7]]; let row2 = [matrixb[ 8], matrixb[ 9], matrixb[10], matrixb[11]]; let row3 = [matrixb[12], matrixb[13], matrixb[14], matrixb[15]]; // multiply each row by matrixa let result0 = multiplymatrixandpoint(matrixa, row0); let result1 = multiplymatrixandpoint(matrixa, row1); let result2 = multiplymatrixandpoint(matrixa, row2); let result3 = multiplymatrixandpoint(matrixa, row3); // turn the result rows back into a single matrix return [ result0[0], result0[1], result0[2], result0[3], result1[0], result1[1], result1[2], result1[3], result2[0], result2[1], result2[2], result2[3], result3[0], result3[1], result3[2], result3[3] ]; } let's look at this function in action: let somematrix = [ 4, 0, 0, 0, 0, 3, 0, 0, 0, 0, 5, 0, 4, 8, 4, 1 ] let identitym...
...these functions create a lot of new arrays, which can be particularly expensive for real-time operations due to garbage collection. in real production code it would be best to use...
...And 7 more matches

WritableStream.WritableStream() - Web APIs
ining methods and properties that define how the constructed stream instance will behave. underlyingsink can contain the following: start(controller) optional this is a method, called immediately when the object is constructed. the contents of this method are defined by the developer, and should aim to get access to the underlying sink. if this process is to be done asynchronously, it can return a promise to signal success or failure. the controller parameter passed to this method is a writablestreamdefaultcontroller. this can be used by the developer to control the stream during set up. write(chunk, controller) optional this method, also defined by the developer, will be called when a new chunk of data (specified in the chunk parameter) is ready to be written to the underlying sink.
... to signal success or failure. the controller parameter passed to this method is a writablestreamdefaultcontroller. this can be used by the developer to control the stream during set up. write(chunk, controller) optional this method, also defined by the developer, will be called when a new chunk of data (specified in the chunk parameter) is ready to be written to the underlying sink. it can return a promise to signal success or failure of the write operation. the controller parameter passed to this method is a writablestreamdefaultcontroller that can be used by the developer to control the stream as more chunks are submitted for writing. this method will be called only after previous writes have succeeded, and never after the stream is closed or aborted (see below). close(controller) opt...
...writes have succeeded, and never after the stream is closed or aborted (see below). close(controller) optional this method, also defined by the developer, will be called if the app signals that it has finished writing chunks to the stream. the contents should do whatever is necessary to finalize writes to the underlying sink, and release access to it. if this process is asynchronous, it can return a promise to signal success or failure. this method will be called only after all queued-up writes have succeeded. the controller parameter passed to this method is a writablestreamdefaultcontroller, which can be used to control the stream at the end of writing. abort(reason) optional this method, also defined by the developer, will be called if the app signals that it wishes to abruptly clos...
...And 7 more matches

Private class fields - JavaScript
class properties are public by default and can be examined or modified outside the class. there is however an experimental proposal to allow defining private class fields using a hash # prefix is added. ...
...static_field } examples private static fields private fields are accessible on the class constructor from inside the class declaration itself. the limitation of static variables being called by only static methods still holds. class classwithprivatestaticfield { static #private_static_field static publicstaticmethod() { classwithprivatestaticfield.#private_static_field = 42 return classwithprivatestaticfield.#private_static_field } } console.assert(classwithprivatestaticfield.publicstaticmethod() === 42) private static fields are added to the class constructor at class evaluation time. there is a provenance restriction on private static fields. only the class which defines the private static field can access the field. this can lead to unexpected behaviour when using...
...dded to the class constructor at class evaluation time. there is a provenance restriction on private static fields. only the class which defines the private static field can access the field. this can lead to unexpected behaviour when using this. class baseclasswithprivatestaticfield { static #private_static_field static basepublicstaticmethod() { this.#private_static_field = 42 return this.#private_static_field } } class subclass extends baseclasswithprivatestaticfield { } let error = null try { subclass.basepublicstaticmethod() } catch(e) { error = e} console.assert(error instanceof typeerror) private instance fields private instance fields are declared with # names (pronounced "hash names"), which are identifiers prefixed with #. the # is a part of the name itself...
...And 7 more matches

Function.prototype.bind() - JavaScript
a function (supplied as a callback) inside a settimeout, any primitive value passed as thisarg is converted to object. if no arguments are provided to bind , or if the thisarg is null or undefined, the this of the executing scope is treated as the thisarg for the new function. arg1, arg2, ...argn optional arguments to prepend to arguments provided to the bound function when invoking func. return value a copy of the given function with the specified this value, and initial arguments (if provided). description the bind() function creates a new bound function, which is an exotic function object (a term from ecmascript 2015) that wraps the original function object. calling the bound function generally results in the execution of its wrapped function. a bound function has the following in...
... // yes, it does work with `new (funca.bind(thisarg, args)...
... // yes, it does work with `new (funca.bind(thisarg, args))` if (!function.prototype.bind) (function(){ var arrayprototypeslice = array.p...
...And 7 more matches

JSON.stringify() - JavaScript
it indicates the number of space characters to use as white space; this number is capped at 10 (if it is greater, the value is just 10). values less than 1 indicate that no space should be used. if this is a string, the string (or the first 10 characters of the string, if it's longer than that) is used as white space. if this parameter is not provided (or is null), no white space is used. return value a json string representing the given value. exceptions throws a typeerror ("cyclic object value") exception when a circular reference is found. throws a typeerror ("bigint value can't be serialized in json") when trying to stringify a bigint value. description json.stringify() converts a value to json notation representing it: if the value has a tojson() method, it's responsible...
... boolean, number, and string objects are converted to the corresponding primitive values during stringification, in accord with the traditional conversion semantics. undefined, functions, and symbols are not valid json values. if any such values are encountered during conversion they are either omitted (when found in an object) or changed to null (when found in an array). json.stringify() can return undefined when passing in "pure" values like json.stringify(function(){}) or json.stringify(undefined). all symbol-keyed properties will be completely ignored, even when using the replacer function. the instances of date implement the tojson() function by returning a string (the same as date.toisostring()). thus, they are treated as strings. the numbers infinity and nan, as well as the value n...
...on.stringify([new int8array([1]), new int16array([1]), new int32array([1])]); // '[{"0":1},{"0":1},{"0":1}]' json.stringify([new uint8array([1]), new uint8clampedarray([1]), new uint16array([1]), new uint32array([1])]); // '[{"0":1},{"0":1},{"0":1},{"0":1}]' json.stringify([new float32array([1]), new float64array([1])]); // '[{"0":1},{"0":1}]' // tojson() json.stringify({ x: 5, y: 6, tojson(){ return this.x + this.y; } }); // '11' // symbols: json.stringify({ x: undefined, y: object, z: symbol('') }); // '{}' json.stringify({ [symbol('foo')]: 'foo' }); // '{}' json.stringify({ [symbol.for('foo')]: 'foo' }, [symbol.for('foo')]); // '{}' json.stringify({ [symbol.for('foo')]: 'foo' }, function(k, v) { if (typeof k === 'symbol') { return 'a symbol'; } }); // undefined // non-enumerable ...
...And 7 more matches

Math - JavaScript
of 10; approximately 2.303. math.log2e base-2 logarithm of e; approximately 1.443. math.log10e base-10 logarithm of e; approximately 0.434. math.pi ratio of the a circle's circumference to its diameter; approximately 3.14159. math.sqrt1_2 square root of ½ (or equivalently, 1/√2); approximately 0.707. math.sqrt2 square root of 2; approximately 1.414. ...
...logarithm of e; approximately 1.443. math.log10e base-10 logarithm of e; approximately 0.434. math.pi ratio of the a circle's circumference to its diameter; approximately 3.14159. math.sqrt1_2 square root of ½ (or equivalently, 1/√2); approximately 0.707. math.sqrt2 square root of 2; approximately 1.414. static methods math.abs(x) returns the absolute value of x. math.acos(x) returns the arccosine of x. math.acosh(x) returns the hyperbolic arccosine of x. math.asin(x) returns the arcsine of x. math.asinh(x) returns the hyperbolic arcsine of a number. math.atan(x) returns the arctangent of x. math.atanh(x) returns the hyperbolic arctangent of x. math.atan2(y, x) returns the arctangent of the quotient of its arguments. math.cbrt(x) returns the cube root of x. ma...
...e of x. math.acosh(x) returns the hyperbolic arccosine of x. math.asin(x) returns the arcsine of x. math.asinh(x) returns the hyperbolic arcsine of a number. math.atan(x) returns the arctangent of x. math.atanh(x) returns the hyperbolic arctangent of x. math.atan2(y, x) returns the arctangent of the quotient of its arguments. math.cbrt(x) returns the cube root of x. math.ceil(x) returns the smallest integer greater than or equal to x. math.clz32(x) returns the number of leading zeroes of the 32-bit integer x. math.cos(x) returns the cosine of x. math.cosh(x) returns the hyperbolic cosine of x. math.exp(x) returns ex, where x is the argument, and e is euler's constant (2.718…, the base of the natural logarithm). math.expm1(x) returns subtracting 1 from exp(x). math.
...And 7 more matches

Object.prototype.propertyIsEnumerable() - JavaScript
description every object has a propertyisenumerable method. ...
...er the specified property is enumerable and is the object's own property. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax obj.propertyisenumerable(prop) parameters prop the name of the property to test. return value a boolean indicating whether the specified property is enumerable and is the object's own property. description every object has a propertyisenumerable method. this method can determine whether the specified property in an object can be enumerated by a for...in loop, with the exception of properties inherited through the prototype chain. if the object does not have the specified property...
...n indicating whether the specified property is enumerable and is the object's own property. description every object has a propertyisenumerable method. this method can determine whether the specified property in an object can be enumerated by a for...in loop, with the exception of properties inherited through the prototype chain. if the object does not have the specified property, this method returns false. examples a basic use of propertyisenumerable the following example shows the use of propertyisenumerable on objects and arrays: var o = {}; var a = []; o.prop = 'is enumerable'; a[0] = 'is enumerable'; o.propertyisenumerable('prop'); // returns true a.propertyisenumerable(0); // returns true user-defined vs. built-in objects the following example demonstrates the enumerab...
...And 7 more matches

String.prototype.indexOf() - JavaScript
the indexof() method returns the index within the calling string object of the first occurrence of the specified value, starting the search at fromindex. returns -1 if the value is not found. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. note: for the array method, see array.prototype.indexof(). syntax str.indexof(searchvalue [, fromindex]) parameters searchvalue the string value to search for. if no string is explicitly provided, searchvalue will be coerced to "undefined", and this value will be searched for in str. ...
.../mdn/interactive-examples and send us a pull request. note: for the array method, see array.prototype.indexof(). syntax str.indexof(searchvalue [, fromindex]) parameters searchvalue the string value to search for. if no string is explicitly provided, searchvalue will be coerced to "undefined", and this value will be searched for in str. so, for example: 'undefined'.indexof() will return 0, as undefined is found at position 0 in the string undefined. 'undefine'.indexof() however will return -1, as undefined is not found in the string undefine. fromindex optional an integer representing the index at which to start the search. defaults to 0. for fromindex values lower than 0, or greater than str.length, the search starts at index 0 and str.length, respectively. for exampl...
...n the string undefined. 'undefine'.indexof() however will return -1, as undefined is not found in the string undefine. fromindex optional an integer representing the index at which to start the search. defaults to 0. for fromindex values lower than 0, or greater than str.length, the search starts at index 0 and str.length, respectively. for example, 'hello world'.indexof('o', -5) will return 4, as it starts at position 0, and o is found at position 4. on the other hand, 'hello world'.indexof('o', 11) (and with any fromindex value greater than 11) will return -1, as the search is started at position 11, a position after the end of the string. return value the index of the first occurrence of searchvalue, or -1 if not found. an empty string searchvalue produces strange results. w...
...And 7 more matches

delete operator - JavaScript
ribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax delete expression where expression should evaluate to a property reference, e.g.: delete object.property delete object['property'] parameters object the name of an object, or an expression evaluating to an object. property the property to delete. return value true for all cases except when the property is an own non-configurable property, in which case, false is returned in non-strict mode. exceptions throws typeerror in strict mode if the property is an own non-configurable property. description unlike what common belief suggests (perhaps due to other programming languages like delete in c++), the delete operator has nothing to do with dir...
... property. description unlike what common belief suggests (perhaps due to other programming languages like delete in c++), the delete operator has nothing to do with directly freeing memory. memory management is done indirectly via breaking references. see the memory management page for more details. the delete operator removes a given property from an object. on successful deletion, it will return true, else false will be returned. however, it is important to consider the following scenarios: if the property which you are trying to delete does not exist, delete will not have any effect and will return true. if a property with the same name exists on the object's prototype chain, then, after deletion, the object will use the property from the prototype chain (in other words, delete onl...
...ich they were defined. non-configurable properties cannot be removed. this includes properties of built-in objects like math, array, object and properties that are created as non-configurable with methods like object.defineproperty(). the following snippet gives a simple example: var employee = { age: 28, name: 'abc', designation: 'developer' } console.log(delete employee.name); // returns true console.log(delete employee.age); // returns true // when trying to delete a property that does // not exist, true is returned console.log(delete employee.salary); // returns true non-configurable properties when a property is marked as non-configurable, delete won't have any effect, and will return false. in strict mode this will raise a typeerror. var employee = {}; object.definep...
...And 7 more matches

instanceof - JavaScript
the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax object instanceof constructor parameters object the object to test. constructor function to test against description the instanceof operator tests the presence of constructor.prototype in object's prototype chain. ...
...bject.setprototypeof. it is also possible using the non-standard __proto__ property. instanceof and multiple context (e.g. frames or windows) different scopes have different execution environments. this means that they have different built-ins (different global object, different constructors, etc.). this may result in unexpected results. for instance, [] instanceof window.frames[0].array will return false, because array.prototype !== window.frames[0].array and arrays inherit from the former. this may not make sense at first, but for scripts dealing with multiple frames or windows, and passing objects from one context to another via functions, this will be a valid and strong issue. for instance, you can securely check if a given object is, in fact, an array using array.isarray(myobj) for ex...
...ect is, in fact, an array using array.isarray(myobj) for example, checking if a nodes is a svgelement in a different context, you can use mynode instanceof mynode.ownerdocument.defaultview.svgelement. note for mozilla developers: in code using xpcom, instanceof has special effect: obj instanceof xpcominterface (e.g. components.interfaces.nsifile) calls obj.queryinterface(xpcominterface) and returns true if queryinterface succeeded. a side effect of such call is that you can use xpcominterface's properties on obj after a successful instanceof test. unlike standard javascript globals, the test obj instanceof xpcominterface works as expected, even if obj is from a different scope. examples demonstrating that string and date are of type object and exceptional cases the following code uses...
...And 7 more matches

Caching compiled WebAssembly modules - WebAssembly
ng library because indexeddb is a somewhat old-fashioned api, we wanted to provide a library function to speed up writing caching code, and make it work better along with today's more modern apis. in our wasm-utils.js library script, you'll find instantiatecachedurl() — this function fetches the wasm module at url with a version of dbversion, instantiates it with the given importobject, and returns a promise resolving to the finished wasm instance. additionally, it handles creating a database to cache the compiled wasm modules in, attempts to store new modules in the database, and retrieves previously cached modules from the database, saving you from having to download them again. note: the entire site's wasm cache (not just the given url) is versioned by the specified dbversion passed i...
...ing some necessary constants: function instantiatecachedurl(dbversion, url, importobject) { const dbname = 'wasm-cache'; const storename = 'wasm-cache'; setting up the database the first helper function contained inside instantiatecachedurl() — opendatabase() — creates an object store for storing wasm modules, and also handles clearing out the database if the dbversion is updated; it returns a promise resolving to the new database. function opendatabase() { return new promise((resolve, reject) => { var request = indexeddb.open(dbname, dbversion); request.onerror = reject.bind(null, 'error opening wasm cache database'); request.onsuccess = () => { resolve(request.result) }; request.onupgradeneeded = event => { var db = request.result; if...
...n ${event.newversion} wasm cache`); db.createobjectstore(storename) }; }); } looking up modules in the database our next function — lookupindatabase() — provides a simple promise-based operation for looking up the given url in the object store we created above. it resolves with the stored compiled module, or rejects with an error. ...
...And 7 more matches

Private Properties - Archive of obsolete content
h an underscore. consider the following example: function point(x, y) { this._x = x; this._y = y; } the properties _x and _y are intended to be private, and should only be accessed by member functions. to make a private property readable/writable from any function, it's common to define getter/setter functions for the property, respectively: point.prototype.getx = function () { return this._x; }; point.prototype.setx = function (x) { this._x = x; }; point.prototype.gety = function () { return this._y; }; point.prototype.sety = function (y) { this._y = y; }; the above technique is simple and clearly expresses intent. however, the use of an underscore prefix is just a coding convention and is not enforced by the language: there is nothing to prevent a user from ...
...refix is just a coding convention and is not enforced by the language: there is nothing to prevent a user from directly accessing a property that is supposed to be private. using closures another common technique, is to define private properties as variables and their getter and setter functions as a closure over these variables: function point(_x, _y) { this.getx = function () { return _x; }; this.setx = function (x) { _x = x; }; this.gety = function () { return _y; }; this.sety = function (y) { _y = y; }; } note that this technique requires member functions that need access to private properties to be defined on the object itself, instead of its prototype. this is slightly less efficient than using the underscore convent...
...duced to javascript in ecmascript 2015 and have recently been implemented in spidermonkey. ...
...And 6 more matches

tabs/utils - Archive of obsolete content
functions for working with xul tabs and the xul tabbrowser object. globals functions activatetab(tab, window) set the specified tab as the active, or selected, tab. parameters tab : tab a xul tab element to activate. window : window a browser window. gettabbrowser(window) get the tabbrowser element for the given browser window. parameters window : window a browser window. returns tabbrowser : gettabcontainer(window) get the tabbrowser's tabcontainer property. parameters window : window a browser window. returns tabcontainer : gettabs(window) returns the tabs for the specified window. if you omit window, this function will return tabs across all the browser's windows. however, if your add-on has not opted into private browsing, then the function will exclude all tab...
... tabs across all the browser's windows. however, if your add-on has not opted into private browsing, then the function will exclude all tabs that are hosted by private browser windows. to learn more about private windows, how to opt into private browsing, and how to support private browsing, refer to the documentation for the private-browsing module. parameters window : nsiwindow optional. returns array : an array of tab elements. getactivetab(window) given a browser window, get the active, or selected, tab. parameters window : window a browser window. returns tab : the currently selected tab. getownerwindow(tab) get the browser window that owns the specified tab. parameters tab : tab a browser tab. returns window : a browser window. opentab(window, url, options) open a n...
...b. url : string url for the document to load. options : object optional options: name type inbackground boolean if true, open the new tab, but keep the currently selected tab selected. if false, make the new tab the selected tab. optional, defaults to false. pinned boolean pin this tab. optional, defaults to false. returns tab : the new tab. istabopen(tab) test whether the specified tab is open. parameters tab : tab a xul tab element. returns boolean : true if the tab is open, otherwise false. closetab(tab) close the specified tab. parameters tab : tab a xul tab element. geturi(tab) get the specified tab's uri. parameters tab : tab a xul tab element. returns string : the current uri. gettabbro...
...And 6 more matches

Miscellaneous - Archive of obsolete content
this page contains small, self-explanatory code snippets. system info operating system detection // returns "winnt" on windows vista, xp, 2000, and nt systems; // "linux" on gnu/linux; and "darwin" on mac os x. ...
... this page contains small, self-explanatory code snippets. system info operating system detection // returns "winnt" on windows vista, xp, 2000, and nt systems; // "linux" on gnu/linux; and "darwin" on mac os x. ...
...f-explanatory code snippets. system info operating system detection // returns "winnt" on windows vista, xp, 2000, and nt systems; // "linux" on gnu/linux; and "darwin" on mac os x. ...
...And 6 more matches

Tabbed browser - Archive of obsolete content
pageload(event) { if (event.originaltarget instanceof components.interfaces.nsidomhtmldocument) { var win = event.originaltarget.defaultview; if (win.frameelement) { // frame within a tab was loaded. win should be the top window of // the frameset. if you don't want do anything when frames/iframes // are loaded in this web page, uncomment the following line: // return; // find the root document: win = win.top; } } } // do not try to add a callback until the browser window has // been initialised. we add a callback to the tabbed browser // when the browser's window gets loaded. window.addeventlistener("load", function () { // add a callback to be run every time a document loads. // note that this includes frames/iframes within the documen...
...cument from windows or dialogs not opened by the browser window, you can use nsiwindowmediator to get the document displayed in the selected tab of the most recently used browser window. var wm = components.classes["@mozilla.org/appshell/window-mediator;1"] .getservice(components.interfaces.nsiwindowmediator); var recentwindow = wm.getmostrecentwindow("navigator:browser"); return recentwindow ? recentwindow.content.document.location : null; see also working with windows in chrome code. enumerating browsers to go through all browser in a tabbrowser, first get a reference to a browser's window. if your code is executed from a firefox browser.xul overlay (for example, it is a toolbar button or menu click handler), you can access the current window with the window pre-def...
...urrent reference pages on browser and tabbrowser. getting the browser that fires the http-on-modify-request notification see the observer notifications page for information on http-on-* notifications. note that some http requests aren't associated with a tab; for example, rss feed updates, extension manager requests, xhr requests from xpcom components, etc. in those cases, the following code returns null. warning: this code should be updated to use nsiloadcontext instead of getinterface(components.interfaces.nsidomwindow). updated example is in section below this observe: function (subject, topic, data) { if (topic == "http-on-modify-request") { subject.queryinterface(components.interfaces.nsihttpchannel); var url = subject.uri.spec; /* url being requested. you might want this f...
...And 6 more matches

Sorting and filtering a custom tree view - Archive of obsolete content
operty for (var i in element) { if (prepareforcomparison(element[i]).indexof(filtertext) != -1) { table.push(element); break; } } }); } sort(); //restore scroll position if (topvisiblerow) { settopvisiblerow(topvisiblerow); } } //generic custom tree view stuff function treeview(table) { this.rowcount = table.length; this.getcelltext = function(row, col) { return table[row][col.id]; }; this.getcellvalue = function(row, col) { return table[row][col.id]; }; this.settree = function(treebox) { this.treebox = treebox; }; this.iseditable = function(row, col) { return col.editable; }; this.iscontainer = function(row){ return false; }; this.isseparator = function(row){ return false; }; this.issorted = function(){ return false; }; this.getlevel = ...
...1 : -1; //if the column is...
...return table[row][col.id]; }; this.settree = function(treebox) { this.treebox = treebox; }; this.iseditable = function(row, col) { return col.editable; }; this.iscontainer = function(row){ return false; }; this.isseparator = function(row){ return false; }; this.issorted = function(){ return false; }; this.getlevel = function(row){ return 0; }; this.getimagesrc = function(row,col){ return null; }; this.getrowproperties = function(row,props){}; this.getcellproperties = function(row,col,props){}; this.getcolumnproperties = function(colid,col,props){}; this.cycleheader = function(col, elem) {}; } function sort(column) { var columnname; var order = tree.getattribute("sortdirection") == "ascending" ? 1 : -1; //if the column is passed and it's already sorted by that column, reve...
...And 6 more matches

Template and Tree Listeners - Archive of obsolete content
above makes use of the getresourceatindex and getindexofresource methods. these two methods are available for tree builders and will convert between an index in the tree and the associated member resource for the item at the index. naturally, we can't store the index as the item may have moved its position. ...
...finally, you can remove a listener using the builder's removelistener method. listening for tree changes the second type of listener is used to handle particular actions related to trees. ...
...agging onto a folder type of row. in other situations, you may wish to allow items to be dragged between (before or after) rows. this would be the situation if you were dragging items from that tree around, for instance dragging a bookmark from one location to another. the tree widget will draw a small line between the rows while dragging. ...
...And 6 more matches

Box Objects - Archive of obsolete content
e the position and size of the xul element as displayed, and second, you can determine the order of the elements in the box as displayed, instead of their order as they are stored in the dom. retrieving position and size the box object provides six read only properties, x, y, screenx, screeny, width and height, for determining the currently displayed position and size of an element. all values returned are in pixels. x, y the x and y coordinates are referenced from the top left corner of the document in the window (that portion which excludes the window border and title bar) and refer to the top left corner of the element, including css padding. css margins and borders* are excluded. the top left corner of the document is that which is obtained from screen.mozinnerscreenx, screen.mozinnersc...
...ich is obtained from screen.mozinnerscreenx, screen.mozinnerscreeny screenx, screeny the screenx and screeny coordinates are referenced from the absolute top left corner of the screen (screen.top,screen.left) and refer to the top left corner of the element, including css padding and borders. css margins are excluded. width, height the width and height properties are also measured in pixels and return the width and height of the element, including css padding and borders. css margins are excluded. *note that x, y refers to the portion of the element that is just inside any borders, which is inconsistent with the other four boxobject position and size references, which include borders as part of the element. the values are always the position and sizes as currently displayed, so the values ...
...xible element will change in size and the box object dimensions will update accordingly. the following example shows this. example 1 : source view <button label="click me" oncommand="alert('the width is ' + this.boxobject.width);"/> you can use the width and height attributes of the element to specify the element's width and height, respectively. ...
...And 6 more matches

prefwindow - Archive of obsolete content
over this hides separator between titlebar and window contents. this affects only on mac os x. lastselected type: string set this to the id of the last selected pane. it will be opened by default the next time the preferences dialog is opened. onbeforeaccept type: script code the code in this attribute is called when the ok button is pressed or the acceptdialog method is called. returning false doesn't currently prevent the dialog from closing, but does prevent saving (bug 474527). ondialogaccept type: script code the code in this attribute is called when the accept button is pressed, or when the acceptdialog method is called. if the handler returns true, the dialog will indeed go away, but if it returns false it will not. ondialogcancel type: script code the ...
... ondialogdisclosure type: script code the code in this attribute is called when the "disclosure" button is pressed. ...
... ondialogdisclosure type: script code the code in this attribute is called when the "disclosure" button is pressed. ondialoghelp type: script code the code in this attribute is called when the "help" button is pressed. ...
...And 6 more matches

textbox - Archive of obsolete content
ire if the user presses the enter key. the timed type is deprecated in gecko 1.9.1 and the search textbox may be used instead. value type: string the default value entered in a textbox. the attribute only holds the default value and is never modified when the user enters text. to get the updated value, use the value property. for number boxes, the default is 0 or the minimum value returned by the min property, whichever is higher. wrap type: string set this attribute to the value off to disable word wrapping in the textbox. if this attribute is not specified, word wrapping is enabled. wraparound type: boolean if true, the value of the number box will wrap around when the maximum or minimum value is exceeded. the minimum and maximum values must both not be infin...
... type: integer gets and sets the value of the increment attribute. inputfield type: textbox element in mozilla, the xul textbox is implemented as a wrapper around an html input element. this read only property holds a reference to this inner input element. label type: string sets the label attribute. gets the label attribute if it is present and not empty. otherwise it returns the value of the associated label element, if applicable. otherwise it returns the placeholder or emptytext property. the getter is mostly useful for screen readers. note: prior to firefox 3, and always in thunderbird and seamonkey, the label property of an autocomplete textbox returns its value, for compatibility with the menulist element. max type: integer gets an...
... caret (cursor) within the textbox. selectionstart type: integer get or set the beginning of the selected portion of the field's text. use in conjuction with the selectionend property. the value specifies the index of the first selected character. size type: integer gets and sets the value of the size attribute. spinbuttons type: element the read-only property returns a reference to the spinbuttons element used by the number box. tabindex type: integer gets and sets the value of the tabindex attribute. textlength type: integer holds the length of the text entered in the textbox. this property is read-only. timeout type: integer gets and sets the value of the timeout attribute. type type: string gets an...
...And 6 more matches

NPN_GetValue - Archive of obsolete content
rowser for information. syntax #include <npapi.h> nperror npn_getvalue(npp instance, npnvariable variable, void *value); parameters this function has the following parameters: instance pointer to the current plug-in instance. variable information the call gets. ...
...pn_getvalue(npp instance, npnvariable variable, void *value); parameters this function has the following parameters: instance pointer to the current plug-in instance. variable information the call gets. ...
...ers: instance pointer to the current plug-in instance. variable information the call gets. ...
...And 6 more matches

Implementing controls using the Gamepad API - Game development
es) and avoid the "bad" food (beer, burgers, pizza.) a countdown changes the type of food the fridge wants to eat every few seconds, so you have to be careful and act quickly. the second, hidden "change" implementation is the ability to transform the static fridge into a full-blown moving, shooting and eating machine. when you connect the controller, the game significantly changes (hungry fridge turns into the super turbo hungry fridge) and you're able to control the armored fridge using the gamepad api. you have to shoot down the food, but once again you also have to find the type of food the fridge wants to eat at each point, or else you'll lose energy. the game encapsulates two totally different types of "change" — good food vs. bad food, and mobile vs. desktop. demo the full version ...
...ble on github where you can dive deep into the code and study exactly how it works. the code explained below is from the full version of the hungry fridge game, but it's almost identical to the one from the demo — the only difference is that the full version uses the turbo variable to decide whether or not the game will be launched using super turbo mode. ...
... implementation there are two important events to use along with the gamepad api — gamepadconnected and gamepaddisconnected. ...
...And 6 more matches

Introduction to the server side - Learn web development
a status line indicating whether or not the request succeeded (e.g. "http/1.1 200 ok" for success). the body of a successful response to a request would contain the requested resource (e.g. a new html page, or an image, etc...), which could then be displayed by the web browser. static sites the diagram below shows a basic web server architecture for a static site (a static site is one that returns the same hard-coded content from the server whenever a particular resource is requested). when a user wants to navigate to a page, the browser sends an http "get" request specifying its url. the server retrieves the requested document from its file system and returns an http response containing the document and a success status (usually 200 ok). if the file cannot be retrieved for some reason, ...
... content from the server whenever a particular resource is requested). when a user wants to navigate to a page, the browser sends an http "get" request specifying its url. the server retrieves the requested document from its file system and returns an http response containing the document and a success status (usually 200 ok). if the file cannot be retrieved for some reason, an error status is returned (see client error responses and server error responses). dynamic sites a dynamic website is one where some of the response content is generated dynamically, only when needed. on a dynamic website html pages are normally created by inserting data from a database into placeholders in html templates (this is a much more efficient way of storing large amounts of content than using static websit...
...es and server error responses). dynamic sites a dynamic website is one where some of the response content is generated dynamically, only when needed. on a dynamic website html pages are normally created by inserting data from a database into placeholders in html templates (this is a much more efficient way of storing large amounts of content than using static websites). a dynamic site can return different data for a url based on information provided by the user or stored preferences and can perform other operations as part of returning a response (e.g. sending notifications). most of the code to support a dynamic website must run on the server. creating this code is known as "server-side programming" (or sometimes "back-end scripting"). the diagram below shows a simple architecture for...
...And 6 more matches

Handling common JavaScript problems - Learn web development
se for loops do all their iterating before nested functions are invoked. if you want this to work correctly, you need to define a function to add the handler separately, calling it on each iteration and passing it the current value of para and i each time (or something similar). see good-for-loop.html (see the source code also) for a version that works. making sure asynchronous operations have returned before trying to use the values they return. for example, this ajax example checks to make sure the request is complete and the response has been returned before trying to use the response for anything. this kind of operation has been made easier to handle by the introduction of promises to the javascript language. note: buggy javascript code: the 10 most common mistakes javascript developer...
...vailable. to install it: install atom (if you haven't got an up-to-date version already installed) — download it from the atom page linked above. go to atom's preferences... dialog (e.g. by choosing atom > preferences... on mac, or file > preferences... on windows/linux) and choose the install option in the left-hand menu. in the search packages text field, type "jslint" and press enter/return to search for linting-related packages. you should see a package called lint at the top of the list. install this first (using the install button), as other linters rely on it to work. after that, install the linter-jshint plugin. after the packages have finished installing, try loading up a javascript file: you'll see any issues highlighted with green (for warnings) and red (for errors) circle...
...value: ' + superheroes); refresh the page in the browser, and you will get an output in the console of "response value:", plus the same error message we saw before the console.log() output shows that the superheroes object doesn't appear to contain anything. a very common problem with async requests like this is when you try to do something with the response object before it has actually been returned from the network. let's fix this problem by running the code once the load event has been fired — remove the console.log() line, and update this code block: let superheroes = request.response; populateheader(superheroes); showheroes(superheroes); to the following: request.onload = function() { let superheroes = request.response; populateheader(superheroes); showheroes(superheroes); }...
...And 6 more matches

HTML parser threading
data from document.write(). it also has another lazily initialized tokenizer/tree builder for speculatively scanning the tail of document.write() data when the parser blocks without parsing the document.write() data to completion. nshtml5streamparser has one tokenizer/tree builder pair for parsing data from the network. additionally, each nshtml5parser has an associated nshtml5treeopexecutor that turns the output (tree operations; discussed later) of the portable parser core into actions performed on the gecko dom. initialization an nshtml5parser is constructed without an nshtml5streamparser due to legacy code structure around parser creation. if the parser is not script-created, nshtml5parser::markasnotscriptcreated() is called to create an nshtml5streamparser for the nshtml5parser. due to le...
...lling using html in an iframe e.g. for a chat app.) some tree ops hold char or prunichar arrays. those arrays are allocated when creating the tree op and delete[]d by the destructor of nshtml5treeoperation. hence, data gets copied to and from these arrays. executing tree ops when the executor flushing runnable fires on the main thread, it calls nshtml5treeopexecutor::runflushloop(). this method returns immediately if another invocation of it is already on the call stack (nested event loop case). the method then enters a loop that has a bunch of return conditions (including parser termination). the loop first flushes speculative loads (creation discussed later). if the executor is reading from a stage (i.e. the ops are coming from the parser thread), the executor moves the tree ops from the sta...
...f having to synchronize thread on a per-tree op basis.) if the executor isn't reading from a stage, it calls nshtml5parser::parseuntilblocked() to parse potential document.write()-generated data into tree ops. the outer loop then has an inner loop that iterates over the tree ops in the executor's queue and calls perform on each one. ...
...And 6 more matches

Introduction to NSPR
ently from other threads in the same process. a thread has a limited number of resources that it truly owns. these resources include the thread stack and the cpu register set (including pc). to an nspr client, a thread is represented by a pointer to an opaque structure of type prthread. a thread is created by an explicit client request and remains a valid, independent execution entity until it returns from its root function or the process abnormally terminates. (prthread and functions for creating and manipulating threads are described in detail in threads.) nspr threads are lightweight in the sense that they are cheaper than full-blown processes, but they are not free. they achieve the cost reduction by relying on their containing process to manage most of the resources that they access. th...
...ve threads. global threads are scheduled by the host os--not by nspr--either within a process or across processes on the entire host. global threads correspond to native threads on the host os. nspr threads can also be either user threads or system threads. nspr provides a function, pr_cleanup, that synchronizes process termination. pr_cleanup waits for the last user thread to exit before returning, whereas it ignores system threads when determining when a process should exit. this arrangement implies that a system thread should not have volatile data that needs to be safely stored away. priorities for nspr threads are based loosely on hints provided by the client and sometimes constrained by the underlying operating system. therefore, priorities are not rigidly defined. for more inform...
...hese systems can support local level thread abstractions that can be made preemptable, but run the risk of library corruption (libc). still other operating systems have a native notion of threads, and their libraries are thread-aware and support locking. however, if local threads are also present, and they are preemptable, they are subject to deadlock. at this time, the only safe solutions are to turn off preemption (a runtime decision) or to preempt global threads only. interrupting threads nspr threads are interruptable, with some constraints and inconsistencies. to interrupt a thread, the caller of pr_interrupt must have the nspr reference to the target thread (prthread*). when the target is interrupted, it is rescheduled from the point at which it was blocked, with a status error indica...
...And 6 more matches

NSS_3.12_release_notes.html
camellia_128_cbc_sha tls_dh_dss_with_camellia_256_cbc_sha tls_dh_rsa_with_camellia_256_cbc_sha tls_dh_anon_with_camellia_256_cbc_sha tls_ecdh_anon_with_null_sha tls_ecdh_anon_with_rc4_128_sha tls_ecdh_anon_with_3des_ede_cbc_sha tls_ecdh_anon_with_aes_128_cbc_sha tls_ecdh_anon_with_aes_256_cbc_sha bugs fixed the following bugs have been fixed in nss 3.12. bug 354403: nsslist_createiterator returns pointer to a freed memory if the function fails to allocate a lock bug 399236: pkix wrapper must print debug output into stderr bug 399300: pkix error results not freed after use. bug 414985: crash in pkix_pl_ocsprequest_destroy bug 421870: strsclnt crashed in pkix tests. bug 429388: vfychain.main leaks memory bug 396044: warning: usage of uninitialized variable in ckfw/object.c(174) bug 396045:...
...bug 391291: shared database integrity checks not yet implemented. bug 391292: s...
...522: integrity hashes must be updated when passwords are changed. ...
...And 6 more matches

JS::CallArgs
signed argc, js::value *vp); name type description args unsigned number of argument. (2nd argument of jsnative) vp js::value * a pointer to the argument value array. (3nd argument of jsnative) methods methods of js::callargs method description bool requireatleast(jscontext *cx, const char *fnname, unsigned required) returns true if there are at least required arguments passed in. if false, it reports an error message on the context. methods inherited from js::callargsbase method description unsigned length() const returns the number of arguments.. js::mutablehandlevalue operator[](unsigned i) const returns the i-th zero-indexed argument. js::handlevalue get(unsig...
...e at least required arguments passed in. if false, it reports an error message on the context. methods inherited from js::callargsbase method description unsigned length() const returns the number of arguments.. js::mutablehandlevalue operator[](unsigned i) const returns the i-th zero-indexed argument. js::handlevalue get(unsigned i) const returns the i-th zero-indexed argument, or undefined if there's no such argument. bool hasdefined(unsigned i) const returns true if the i-th zero-indexed argument is present and is not undefined. methods inherited from js::detail::callreceiverbase method description jsobject &callee() const returns the function being called, as an object. must not be called af...
...this method must not be called when the function is being called as a constructor via new. ...
...And 6 more matches

NS ConvertUTF16toUTF8 external
parameters char** begin char** end char* beginreading() const - source endreading char* endreading() const - source charat char charat(pruint32) const - source parameters pruint32 apos operator[] ...
...meters pruint32 apos first char first() const - source beginwriting pruint32 beginwriting(char**, char**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters char** begin char** end pruint32 newsize char* beginwriting(pruint32) - source parameters pruint32 alen endwriting char* endwriting() - source setlength prbool setlength(pruint32) - source parameters ...
...tor!=(const char*) const - source parameters char* other equalsliteral prbool equalsliteral(const char*) const - source parameters char* other find print32 find(const nsacstring&, print32 (*)(const char*, const char*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 6 more matches

NS LossyConvertUTF16toASCII external
parameters char** begin char** end char* beginreading() const - source endreading char* endreading() const - source charat char charat(pruint32) const - source parameters pruint32 apos operator[] ...
...meters pruint32 apos first char first() const - source beginwriting pruint32 beginwriting(char**, char**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters char** begin char** end pruint32 newsize char* beginwriting(pruint32) - source parameters pruint32 alen endwriting char* endwriting() - source setlength prbool setlength(pruint32) - source parameters ...
...tor!=(const char*) const - source parameters char* other equalsliteral prbool equalsliteral(const char*) const - source parameters char* other find print32 find(const nsacstring&, print32 (*)(const char*, const char*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 6 more matches

PromiseFlatCString (External)
parameters char** begin char** end char* beginreading() const - source endreading char* endreading() const - source charat char charat(pruint32) const - source parameters pruint32 apos operator[] ...
...meters pruint32 apos first char first() const - source beginwriting pruint32 beginwriting(char**, char**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters char** begin char** end pruint32 newsize char* beginwriting(pruint32) - source parameters pruint32 alen endwriting char* endwriting() - source setlength prbool setlength(pruint32) - source parameters ...
...tor!=(const char*) const - source parameters char* other equalsliteral prbool equalsliteral(const char*) const - source parameters char* other find print32 find(const nsacstring&, print32 (*)(const char*, const char*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 6 more matches

nsACString (External)
uals operator< operator<= operator== operator>= operator> operator!= equalsliteral find rfind findchar rfindchar appendint tointeger data members no public members. methods beginreading pruint32 beginreading(const char**, const char**) const - source returns the length, beginning, and end of a string in one operation. parameters char** begin char** end char* beginreading() const - source endreading char* endreading() const - source charat char charat(pruint32) const - source parameters pruint32 apos operator[] ...
...meters pruint32 apos first char first() const - source beginwriting pruint32 beginwriting(char**, char**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters char** begin char** end pruint32 newsize char* beginwriting(pruint32) - source parameters pruint32 alen endwriting char* endwriting() - source setlength prbool setlength(pruint32) - source parameters ...
...tor!=(const char*) const - source parameters char* other equalsliteral prbool equalsliteral(const char*) const - source parameters char* other find print32 find(const nsacstring&, print32 (*)(const char*, const char*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 6 more matches

nsCAutoString (External)
parameters char** begin char** end char* beginreading() const - source endreading char* endreading() const - source charat char charat(pruint32) const - source parameters pruint32 apos operator[] ...
...meters pruint32 apos first char first() const - source beginwriting pruint32 beginwriting(char**, char**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters char** begin char** end pruint32 newsize char* beginwriting(pruint32) - source parameters pruint32 alen endwriting char* endwriting() - source setlength prbool setlength(pruint32) - source parameters ...
...tor!=(const char*) const - source parameters char* other equalsliteral prbool equalsliteral(const char*) const - source parameters char* other find print32 find(const nsacstring&, print32 (*)(const char*, const char*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 6 more matches

nsCString external
parameters char** begin char** end char* beginreading() const - source endreading char* endreading() const - source charat char charat(pruint32) const - source parameters pruint32 apos operator[] ...
...meters pruint32 apos first char first() const - source beginwriting pruint32 beginwriting(char**, char**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters char** begin char** end pruint32 newsize char* beginwriting(pruint32) - source parameters pruint32 alen endwriting char* endwriting() - source setlength prbool setlength(pruint32) - source parameters ...
...tor!=(const char*) const - source parameters char* other equalsliteral prbool equalsliteral(const char*) const - source parameters char* other find print32 find(const nsacstring&, print32 (*)(const char*, const char*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 6 more matches

nsDependentCString external
parameters char** begin char** end char* beginreading() const - source endreading char* endreading() const - source charat char charat(pruint32) const - source parameters pruint32 apos operator[] ...
...meters pruint32 apos first char first() const - source beginwriting pruint32 beginwriting(char**, char**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters char** begin char** end pruint32 newsize char* beginwriting(pruint32) - source parameters pruint32 alen endwriting char* endwriting() - source setlength prbool setlength(pruint32) - source parameters ...
...tor!=(const char*) const - source parameters char* other equalsliteral prbool equalsliteral(const char*) const - source parameters char* other find print32 find(const nsacstring&, print32 (*)(const char*, const char*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 6 more matches

nsDependentCSubstring external
parameters char** begin char** end char* beginreading() const - source endreading char* endreading() const - source charat char charat(pruint32) const - source parameters pruint32 apos operator[] ...
...meters pruint32 apos first char first() const - source beginwriting pruint32 beginwriting(char**, char**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters char** begin char** end pruint32 newsize char* beginwriting(pruint32) - source parameters pruint32 alen endwriting char* endwriting() - source setlength prbool setlength(pruint32) - source parameters ...
...tor!=(const char*) const - source parameters char* other equalsliteral prbool equalsliteral(const char*) const - source parameters char* other find print32 find(const nsacstring&, print32 (*)(const char*, const char*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 6 more matches

nsDependentSubstring external
parameters prunichar* begin prunichar* end prunichar beginreading() const - source endreading prunichar endreading() const - source charat prunichar charat(pruint32) const - source parameters pruint32 apos ...
... pruint32 apos first prunichar first() const - source beginwriting pruint32 beginwriting(prunichar**, prunichar**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters prunichar* begin prunichar* end pruint32 newsize prunichar beginwriting(pruint32) - source parameters pruint32 <anonymous> endwriting prunichar endwriting() - source setlength prbool setlength(pruint32) - source ...
...ol lowercaseequalsliteral(const char*) const - source case-insensitive match this string to a lowercase ascii string. parameters char aasciistring find(const nsastring&, print32 (*) print32 find(const nsastring&, print32 (*)(const prunichar*, const prunichar*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 6 more matches

nsLiteralCString (External)
parameters char** begin char** end char* beginreading() const - source endreading char* endreading() const - source charat char charat(pruint32) const - source parameters pruint32 apos operator[] ...
...meters pruint32 apos first char first() const - source beginwriting pruint32 beginwriting(char**, char**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters char** begin char** end pruint32 newsize char* beginwriting(pruint32) - source parameters pruint32 alen endwriting char* endwriting() - source setlength prbool setlength(pruint32) - source parameters ...
...tor!=(const char*) const - source parameters char* other equalsliteral prbool equalsliteral(const char*) const - source parameters char* other find print32 find(const nsacstring&, print32 (*)(const char*, const char*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 6 more matches

nsLiteralString (External)
parameters char** begin char** end char* beginreading() const - source endreading char* endreading() const - source charat char charat(pruint32) const - source parameters pruint32 apos operator[] ...
...meters pruint32 apos first char first() const - source beginwriting pruint32 beginwriting(char**, char**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters char** begin char** end pruint32 newsize char* beginwriting(pruint32) - source parameters pruint32 alen endwriting char* endwriting() - source setlength prbool setlength(pruint32) - source parameters ...
...tor!=(const char*) const - source parameters char* other equalsliteral prbool equalsliteral(const char*) const - source parameters char* other find print32 find(const nsacstring&, print32 (*)(const char*, const char*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 6 more matches

IAccessibleTableCell
[propget] hresult...
...sibles, [out] long nrowheadercells ); [propget] hresult rowindex([out] long rowindex ); [propget] hresult table([out] iunknown table ); methods columnextent() returns the number of columns occupied by this cell accessible. the result is greater than 1 if the specified cell spans multiple columns. [propget] hresult columnextent( [out] long ncolumnsspanned ); parameters ncolumnsspanned returns the 1 based column extent of the specified cell. return value s_ok. columnheadercells() returns the column headers as an array of cell accessibles. [propget] hresult columnheadercells( [out, size_is(, ncolumnheadercells,)] iunknown cellaccessibles, [out] long ncolumnheadercells ); parameters cellaccessibles pointer to an array of references to cell accessibles. the array is allocated by t...
...ls() returns the column headers as an array of cell accessibles. [propget] hresult columnheadercells( [out, size_is(, ncolumnheadercells,)] iunknown cellaccessibles, [out] long ncolumnheadercells ); parameters cellaccessibles pointer to an array of references to cell accessibles. the array is allocated by the server. free it with cotaskmemfree. ncolumnheadercells the number of accessibles returned; the size of the returned array. return value s_false if there is no header, [out] values are null and 0 respectively. s_ok. columnindex() translates this cell accessible into the corresponding column index. ...
...And 6 more matches

nsIJSON
decodetojsval() note: this met...
... decodetojsval() note: this method may only be used from native code, and provides a way to decode a json string to a jsval for use in your native code. don't forget to gcroot the result before using it. ...
...json string. decodetojsval() note: this method may only be used from native code, and provides a way to decode a json string to a jsval for use in your native code. don't forget to gcroot the result before using it. jsval decodetojsval( in astring str, in jscontext cx ); parameters str the json string to decode. cx the javascript runtime context to use to decode the string. return value the original javascript object, reconstructed from the json string. don't forget to gcroot the jsval before using it. decodefromstream() decodes a json string read from an input stream, returning the javascript object it represents. jsobject decodefromstream( in nsiinputstream stream, in long contentlength ); parameters stream the nsiinputstream from which to read the json...
...And 6 more matches

nsILoginManager
s provided for use only by the formfillcontroller, which calls it directly. it should not be used for any other purpose. nsiautocompleteresult autocompletesearch( in astring asearchstring, in nsiautocompleteresult apreviousresult, in nsidomhtmlinputelement aelement ); parameters asearchstring missing description apreviousresult missing description aelement missing description return value missing description countlogins() returns the number of logins matching the specified criteria. called when only the number of logins is needed, and not the actual logins (which avoids prompting the user for a master password, as the logins don't need to be decrypted). unsigned long countlogins( in astring ahostname, in astring aactionurl, in astring ahttprealm ); parameters ...
...atch any form logins (for example when interested in protocol logins only), specify null. ahttprealm for protocol logins, specify the http realm for which the login applies; this is obtained from the www-authenticate header (see rfc 2617). to match any protocol login, specify "" (empty string). to not match any protocol logins (for example when interested in form logins only), specify null. ...
... findlogins() searches for logins matching the specified criteria. called when looking for logins that might be applicable to a given form or authentication request. ...
...And 6 more matches

nsIMsgMessageService
msgwindow, out nsiuri aurl); parameters asrcuri the string url of the message to copy. acopylistener an nsistreamlistener to be notified of copy events. amovemessage set to true if you want the message to be moved. false leaves it as just a copy. aurllistener a nsiurllistener to be notified of url events. amsgwindow nsimsgwindow for progress and status feedback return values aurl the new nsiuri of the message. copymessages() copy multiple messages at a time. see copymessage [noscript] void copymessages(in nsmsgkeyarrayptr keys, in nsimsgfolder srcfolder, in nsistreamlistener acopylistener, in boolean amovemessage, in nsiurllistener a...
...ndow amsgwindow, out nsiuri aurl); parameters keys an array of message keys to be copied. srcfolder acopylistener an nsistreamlistener to be notified of copy events. amovemessage set to true if you want the message to be moved. false leaves it as just a copy. aurllistener an nsiurllistener amsgwindow nsimsgwindow for progress and status feedback return values aurl the new nsiuri of the message. (?) displaymessage() when you want a message displayed.... void displaymessage(in string amessageuri, in nsisupports adisplayconsumer, in nsimsgwindow amsgwindow, in nsiurllistener aurllistener, in string acharsetoverride, out nsiuri aurl); ...
... in string acharsetoverride, out nsiuri aurl); parameters amessageuri a uri representing the message to display. adisplayconsumer is (for now) an nsidocshell which the message is loaded into. amsgwindow nsimsgwindow for progress and status feedback aurllistener an nsiurllistener acharsetoverride (optional) character set over ride to force the message to use. return values aurl the new nsiuri of the message. openattachment() downloads and opens an attachment. void openattachment(in string acontenttype, in string afilename, in string aurl, in string amessageuri, in nsisupports adisplayconsumer, in nsimsgwindow amsgwindow, in n...
...And 6 more matches

Component; nsIPrefBranch
erenced by this branch. getboolpref() called to get the state of an individual boolean preference. boolean getboolpref( in string aprefname, [optional] in boolean adefaultvalue ); parameters aprefname the boolean preference to get the state of. adefaultvalue requires gecko 54 optional - a default value to use if the preference does not exist (instead of throwing an exception). return value the value of the requested boolean preference. getcharpref() called to get the state of an individual string preference. string getcharpref( in string aprefname, [optional] in string adefaultvalue ); parameters aprefname the string preference to retrieve. adefaultvalue requires gecko 54 optional - a default value to use if the preference does not exist (instead of throwing a...
...of the requested boolean preference. getcharpref() called to get the state of an individual string preference. string getcharpref( in string aprefname, [optional] in string adefaultvalue ); parameters aprefname the string preference to retrieve. adefaultvalue requires gecko 54 optional - a default value to use if the preference does not exist (instead of throwing an exception). return value returns string - the value of the requested string preference. getstringpref() requires gecko 58 (firefox 58 / thunderbird 58 / seamonkey 2.55) called to get the state of an individual utf-8 string preference. utf8string getstringpref( in string aprefname, [optional] in utf8string adefaultvalue ); parameters aprefname the string preference to retrieve. adefaultval...
...ko 58 (firefox 58 / thunderbird 58 / seamonkey 2.55) called to get the state of an individual utf-8 string preference. utf8string getstringpref( in string aprefname, [optional] in utf8string adefaultvalue ); parameters aprefname the string preference to retrieve. adefaultvalue optional - a default value to use if the preference does not exist (instead of throwing an exception). return value returns utf8tring - the value of the requested string preference. getchildlist() returns an array of strings representing the child preferences of the root of this branch. note: this method can be called on either a default or user branch but, in effect, always operates on both. (to call from javascript use children = nsiprefbranch.getchildlist("",obj), which will fill in obj.value wit...
...And 6 more matches

nsIPrincipal
string capability, inout voidptr annotation); native code only! void setcanenablecapability(in string capability, in short canenable); native code only! boolean subsumes(in nsiprincipal other); attributes attribute type description certificate nsisupports the certificate associated with this principal, if any. if there isn't one, this will return null. getting this attribute never throws. read only. certificateid string the fingerprint id of this principal's certificate. throws if there is no certificate associated with this principal. read only. obsolete since gecko 1.8 commonname string the common name for the certificate. this pertains to the certificate authority organization. throws if there is no certi...
...t.domain, and may be null. setting this has no effect on the uri. native code only! fingerprint autf8string the fingerprint id of this principal's certificate. throws if there is no certificate associated with this principal. read only. hascertificate boolean whether this principal is associated with a certificate. read only. hashvalue unsigned long returns a hash value for the principal. read only. native code only! origin string the origin of this principal's codebase uri. an origin is defined as: scheme + host + port. read only. prettyname autf8string the pretty name for the certificate. this sort of (but not really) identifies the subject of the certificate (the entity that stands behind the certificate). note...
...on a set of capabilities, the minimum is computed. constant value description enable_denied 1 enable_unknown 2 enable_with_user_permission 3 enable_granted 4 methods native code only!canenablecapability short canenablecapability( in string capability ); parameters capability missing description return value missing description exceptions thrown missing exception missing description checkmayload() checks whether this principal is allowed to load the network resource located at the given uri under the same-origin policy. this means that codebase principals are only allowed to load resources from the same domain, the system principal is allowed to load anything, and null principals are ...
...And 6 more matches

nsISupportsArray
deleteelementat() void deleteelementat( in unsigned long aindex ); parameters aindex deletelastelement() void deletelastelement( in nsisupports aelement ); parameters aelement violates the xpcom interface guidelines elementat() nsisupports elementat( in unsigned...
...elementat(in nsisupports aelement, in unsigned long aindex); violates the xpcom interface guidelines boolean sizeto(in long asize); violates the xpcom interface guidelines methods violates the xpcom interface guidelines appendelements() boolean appendelements( in nsisupportsarray aelements ); parameters aelements return value clone() nsisupportsarray clone(); parameters none. return value compact() void compact(); parameters none. ...
...; parameters none. return value compact() void compact(); parameters none. ...
...And 6 more matches

nsITransactionListener
ansactionmanager amanager, in nsitransaction atransaction); boolean willundo(in nsitransactionmanager amanager, in nsitransaction atransaction); methods didbeginbatch() called after a nsitransactionmanager begins a batch. void didbeginbatch( in nsitransactionmanager amanager, in nsresult aresult ); parameters amanager the nsitransactionmanager that began a batch. ...
...turned after beginning a batch. diddo() called after a nsitransactionmanager calls the nsitransaction.dotransaction() method of a transaction. void diddo( in nsitransactionmanager amanager, in nsitransaction atransaction, in nsresult adoresult ); parameters amanager the nsitransactionmanager that did the transaction. atransaction the transaction that was executed. adoresult the nsresult returned after executing the transaction. didendbatch() called after a nsitransactionmanager ends a batch. void didendbatch( in nsitransactionmanager amanager, in nsresult aresult ); parameters amanager the nsitransactionmanager ending a batch. aresult the nsresult returned after ending a batch. didmerge() called after a nsitransactionmanager tries to merge a transaction, that was just executed,...
...ger amanager, in nsitransaction atoptransaction, in nsitransaction atransactiontomerge, in boolean adidmerge, in nsresult amergeresult ); parameters amanager the nsitransactionmanager ending a batch. atoptransaction the transaction at the top of the undo stack. atransactiontomerge the transaction to merge. adidmerge true if transaction was merged, else false. ...
...And 6 more matches

nsIWindowWatcher
users must keep this attribute current, including after the topmost window is closed. this attribute will be null if the active window is not an nsidomwindow; for example, if the active window is an alert. methods getchromeforwindow() retrieve the chrome window mapped to the given dom window. nsiwindowwatcher keeps a list of all top-level dom windows currently open, alon...
... dom window. nsiwindowwatcher keeps a list of all top-level dom windows currently open, along with their corresponding chrome interfaces. since dom windows lack a (public) means of retrieving their corresponding chrome, this method will do that. nsiwebbrowserchrome getchromeforwindow( in nsidomwindow awindow ); parameters awindow the nsidomwindow whose chrome window the caller needs. ...
...r corresponding chrome interfaces. since dom windows lack a (public) means of retrieving their corresponding chrome, this method will do that. nsiwebbrowserchrome getchromeforwindow( in nsidomwindow awindow ); parameters awindow the nsidomwindow whose chrome window the caller needs. return value an nsiwebbrowserchrome object for the corresponding chrome window getnewauthprompter() return a newly created nsiauthprompt implementation. nsiauthprompt getnewauthprompter( in nsidomwindow aparent ); parameters aparent the parent window used for posing alerts. can be null. return value a new nsiauthprompt object. getnewprompter() return a newly created nsiprompt implementation. nsiprompt getnewprompter( in nsidomwindow aparent ); parameters aparent the parent nsido...
...And 6 more matches

nsIXULTemplateQueryProcessor
in astring aexpr ); parameters arulenode rule to add the binding to. avar variable that will be bound. aref variable that holds reference value. aexpr expression used to compute the value to assign. exceptions thrown ns_error_unexpected if generateresults() has already been called. compareresults() compare two results to determine their order, used when sorting results. this method should return -1 when the left result is less than the right, 0 if both are equivalent, and 1 if the left is greater than the right. the comparison should only consider the values for the specified variable. if the comparison variable is null, the results may be sorted in a natural order, for instance, based on the order the data in stored in the datasource. this method must only be called with results that we...
...ethod must only be called with results that were created by this query processor. print32 compareresults( in nsixultemplateresult aleft, in nsixultemplateresult aright, in nsiatom avar, in unsigned long asorthints ); parameters aleft the left result to compare. aright the right result to compare. avar variable to compare. asorthints the sort hints are the flags in nsixulsortservice. return value -1 if aleft < aright 0 if aleft == aright 1 if aleft > aright compilequery() compile a query from a node. the result of this function will later be passed to generateresults() for result generation. if null is returned, the query will be ignored. the template builder will call this method once for each query within the template, before any results can be generated using generateresults(),...
... may use the member variable as a hint to indicate what variable is expected to contain the results. nsisupports compilequery( in nsixultemplatebuilder abuilder, in nsidomnode aquery, in nsiatom arefvariable, in nsiatom amembervariable ); parameters abuilder the template builder. aquery <query> node to compile. arefvariable the reference variable. amembervariable the member variable. return value a compiled query object. done() called when the template builder is being destroyed so that the query processor can clean up any state. the query processor should remove as much state as possible, such as results or references to the builder. this method will also be called when the template is going to be rebuilt. void done(); parameters none. generateresults() generate the results of a q...
...And 6 more matches

nsIZipReader
y must be stored in the zip in either uncompressed or deflate-compressed format for the extraction to be successful. if the entry is a directory, the directory will be extracted non-recursively. void extract( in autf8string zipentry, in nsifile outfile ); parameters zipentry the zip entry to extract. outfile the local file destination used to extract the zip entry. findentries() returns a string enumerator containing the matching entry names. nsiutf8stringenumerator findentries( in autf8string apattern ); parameters apattern a regular expression used to find matching entries in the zip file. set this parameter to null (javascript) or emptycstring() (c++) to get all entries; otherwise, use the following syntax: * matches anything. ? matches one character. $ matc...
...cified for '[^az]' will happen.) [a-z] matches any character between a and z. the characters a and z must either both be letters or both be numbers, with the character represented by 'a' having a lower ascii value than the character represented by 'z'. [^az] matches any character except a or z. if ] is to appear inside the brackets as a character to not match, it must be escaped. pat~pat2 returns matches to the pattern 'pat' which do not also match the pattern 'pat2'. this may be used to perform filtering upon the results of one pattern to remove all matches which also match another pattern. for example, because '*' matches any string and '*z*' matches any string containing a 'z', '*~*z*' will match all strings except those containing a 'z'. note that a pattern may not use '~' multiple t...
.... (foo|bar) will match either the pattern foo or the pattern bar. neither of the patterns foo or bar may use the 'pat~pat2' syntax described immediately above. \ will escape a special character. escaping is required for all special characters unless otherwise specified. all other characters match case-sensitively. an apattern not conforming to this syntax has undefined behavior. return value the nsiutf8stringenumerator containing the matching entry names. exceptions thrown ns_error_illegal_value on many but not all invalid apattern values. getcertificateprincipal() returns an object describing the entity which signed an entry. parsemanifest must be called first. if aentryname is an entry in the jar, getinputstream() must be called after parsemanifest. if aentryname is ...
...And 6 more matches

XPIDL
munging by the msvc++ compiler, an attribute with the name `iid' is forbidden. in addition, any attribute whose name matches the regex /^[a-z]{2,3}i[a-z][a-z]/ is emitted with a warning, as its name looks like an nsiinterface or a moziinterface declaration. also like methods, if the first character of an attribute is lowercase in idl, it is made uppercase in native code only. methods define a return type and a series of in and out parameters. when called from a javascript context, they invocation looks as it is declared for the most part; some parameter properties can adjust what the code looks like. the calls are more mangled in native contexts. an important attribute for methods and attributes is scriptability. a method or attribute is scriptable if it is declared in a scriptable interfac...
... what the code looks like. the calls are more mangled in native contexts. an important attribute for methods and attributes is scriptability. a method or attribute is scriptable if it is declared in a scriptable interface and it lacks a noscript or notxpcom property. any method that is not scriptable can only be accessed by native code. however, scriptable methods must contain parameters and a return type that can be translated to script: any native type, save those declared with an nsid, utf8string, cstring, astring, or jsval property, may not be used in a scriptable method or attribute. an exception to the above rule is if the parameter has the iid_is property (a special case for some queryinterface-like operations). in general, this means that the only usable native types are those declare...
...d in a scriptable method or attribute. an exception to the above rule is if the parameter has the iid_is property (a special case for some queryinterface-like operations). in general, this means that the only usable native types are those declared in nsrootidl.idl (see above). methods and attributes are mangled on conversion to native code. if a method is declared notxpcom, the mangling of the return type is prevented, so it is called mostly as it looks. otherwise, the return type of the native method is nsresult, and the return type acts as a final outparameter if it is not void. the name is translated so that the first character is unconditionally uppercase; subsequent characters are unaffected. however, the presence of the binaryname property allows the user to select another name to use i...
...And 6 more matches

Using COM from js-ctypes
$ cl ole32.lib test.cpp vtable needs vtable description here. the order of the vtable is very critical. when used from c or js-ctypes, the order of the vtable methods should match the order of the c++ vtable. __stdcall and __cdecl needs __stdcall and __cdecl (callback_abi) descr...
... $ cl ole32.lib test.c c code with pseudo struct needs pseudo struct description here. #include <sapi.h> struct myispvoicevtbl; struct myispvoice { struct myispvoicevtbl* lpvtbl; }; struct myispvoicevtbl { /* start inherit from iunknown */ void* queryinterface; void* addref; ulong (__...
...it could be converted into js-ctypes in almost straightforward way. clsid and iid needs clsid and iid of spvoice and ispvoice description here. com types and functions needs com types (guid) and functions (coinitialize etc) description here. converted js-ctypes code here's converted code. this example uses busy loo...
...And 6 more matches

Element.closest() - Web APIs
it may be null. exceptions syntaxerror is thrown if the selectors is not a valid selector list string. ...
...it may be null. exceptions syntaxerror is thrown if the selectors is not a valid selector list string. ...
...it may be null. exceptions syntaxerror is thrown if the selectors is not a valid selector list string. ...
...And 6 more matches

SubtleCrypto.encrypt() - Web APIs
syntax const result = crypto.subtle.encrypt(algorithm, key, data); parameters algorithm is an object specifying the algorithm to be used and any extra parameters if required: to use rsa-oaep, pass an rsaoaepparams object. ...
... any extra parameters if required: to use rsa-oaep, pass an rsaoaepparams object. to use aes-ctr, pass an aesctrparams object. to use aes-cbc, pass an aescbcparams object. to use aes-gcm, pass an aesgcmparams object. key is a cryptokey containing the key to be used for encryption. data is a buffersource containing the data to be encrypted (also known as the plaintext). return value result is a promise that fulfills with an arraybuffer containing the "ciphertext". exceptions the promise is rejected when the following exceptions are encountered: invalidaccesserror raised when the requested operation is not valid for the provided key (e.g. invalid encryption algorithm, or invalid key for the specified encryption algorithm). operationerror raised when the o...
...attacker. examples note: you can try the working examples out on github. rsa-oaep this code fetches the contents of a text box, encodes it for encryption, and encrypts it with using rsa-oaep. see the complete code on github. function getmessageencoding() { const messagebox = document.queryselector(".rsa-oaep #message"); let message = messagebox.value; let enc = new textencoder(); return enc.encode(message); } function encryptmessage(publickey) { let encoded = getmessageencoding(); return window.crypto.subtle.encrypt( { name: "rsa-oaep" }, publickey, encoded ); } aes-ctr this code fetches the contents of a text box, encodes it for encryption, and encrypts it using aes in ctr mode. see the complete code on github. function getmessageencoding() { c...
...And 6 more matches

SubtleCrypto.importKey() - Web APIs
be used to encrypt messages. decrypt: the key may be used to decrypt messages. sign: the key may be used to sign messages. verify: the key may be used to verify signatures. derivekey: the key may be used in deriving a new key. derivebits: the key may be used in deriving bits. wrapkey: the key may be used to wrap a key. unwrapkey: the key may be used to unwrap a key. return value result is a promise that fulfills with the imported key as a cryptokey object. exceptions the promise is rejected when one of the following exceptions is encountered: syntaxerror raised when keyusages is empty but the unwrapped key is of type secret or private. typeerror raised when trying to use an invalid format or if the keydata is not suited for that format. supported form...
...av-ysew" }; examples note: you can try the working examples on github. raw import this example imports an aes key from an arraybuffer containing the bytes to use. see the complete code on github. const rawkey = window.crypto.getrandomvalues(new uint8array(16)); /* import an aes secret key from an arraybuffer containing the raw bytes. takes an arraybuffer string containing the bytes, and returns a promise that will resolve to a cryptokey representing the secret key. */ function importsecretkey(rawkey) { return window.crypto.subtle.importkey( "raw", rawkey, "aes-gcm", true, ["encrypt", "decrypt"] ); } pkcs #8 import this example imports an rsa private signing key from a pem-encoded pkcs #8 object. see the complete code on github. /* convert a string into an arr...
...kcs #8 object. see the complete code on github. ...
...And 6 more matches

SubtleCrypto - Web APIs
security system design and implementation can make the security of the system completely ineffective. if you're not sure you know what you are doing, you probably shouldn't be using this api. properties this interface doesn't inherit any properties, as it has no parent interface. methods this interface doesn't inherit any methods, as it has no parent interface. ...
...ou probably shouldn't be using this api. properties this interface doesn't inherit any properties, as it has no parent interface. methods this interface doesn't inherit any methods, as it has no parent interface. subtlecrypto.encrypt() returns a promise that fufills with the encrypted data corresponding to the clear text, algorithm, and key given as parameters. subtlecrypto.decrypt() returns a promise that fulfills with the clear data corresponding to the encrypted text, algorithm, and key given as parameters. ...
...erface doesn't inherit any methods, as it has no parent interface. subtlecrypto.encrypt() returns a promise that fufills with the encrypted data corresponding to the clear text, algorithm, and key given as parameters. subtlecrypto.decrypt() returns a promise that fulfills with the clear data corresponding to the encrypted text, algorithm, and key given as parameters. subtlecrypto.sign() returns a promise that fulfills with the signature corresponding to the text, algorithm, and key given as parameters. ...
...And 6 more matches

TextRange - Web APIs
when you hold down the mouse to select the content on the page, you create a typical textrange. it is implemented in ie, then a textrange object can be created by element.createtextrange() or document.selection.createrange(). note that this interface is not supported in non ie browsers. alternative selection and range interfaces can be used. ...
...plemented in ie, then a textrange object can be created by element.createtextrange() or document.selection.createrange(). note that this interface is not supported in non ie browsers. alternative selection and range interfaces can be used. properties textrange.boundingheightread only returns the height of the rectangle bound to the textrange object. ...
...ative selection and range interfaces can be used. properties textrange.boundingheightread only returns the height of the rectangle bound to the textrange object. textrange.boundingleftread only returns the distance between the left edge of the rectangle that binds the textrange object and the left edge that completely contains the textrange object. textrange.boundingtopread only returns the distance between the top edge of the rectangle that binds the textrange object and the top edge that completely contains the textrange object. textrange.boundingwidthread only returns the width of the rectangle bound to the textrange object. textrange.htmltext gets or sets the html content within the textrange. textrange.text gets or sets the plaintext content within the textrange...
...And 6 more matches

WebGL2RenderingContext - Web APIs
renderingcontext interface. some methods of the webgl 1 context can accept additional values when used in a webgl 2 context. you will find this info noted on the webgl 1 reference pages. the webgl tutorial has more information, examples, and resources on how to get started with webgl. constants see the webgl constants page. state information webgl2renderingcontext.getindexedparameter() returns the indexed value for the given target. buffers webgl2renderingcontext.bufferdata() initializes and creates the buffer object's data store. webgl2renderingcontext.buffersubdata() updates a subset of a buffer object's data store. webgl2renderingcontext.copybuffersubdata() copies part of the data of a buffer to another buffer. webgl2renderingcontext.getbuffersubdata() reads data from a...
...amebuffer. webgl2renderingcontext.invalidateframebuffer() invalidates the contents of attachments in a framebuffer. webgl2renderingcontext.invalidatesubframebuffer() invalidates portions of the contents of attachments in a framebuffer webgl2renderingcontext.readbuffer() selects a color buffer as the source for pixels. renderbuffers webgl2renderingcontext.getinternalformatparameter() returns information about implementation-dependent support for internal formats. webgl2renderingcontext.renderbufferstoragemultisample() creates and initializes a renderbuffer object's data store and allows specifying the number of samples to be used. textures webgl2renderingcontext.texstorage2d() specifies all levels of two-dimensional texture storage. webgl2renderingcontext.texstorage3d() sp...
...om the current webglframebuffer into an existing 3d texture sub-image. webgl2renderingcontext.compressedteximage3d() specifies a three-dimensional texture image in a compressed format. webgl2renderingcontext.compressedtexsubimage3d() specifies a three-dimensional sub-rectangle for a texture image in a compressed format. programs and shaders webgl2renderingcontext.getfragdatalocation() returns the binding of color numbers to user-defined varying out variables. uniforms and attributes webgl2renderingcontext.uniform[1234][uif][v]() methods specifying values of uniform variables. webgl2renderingcontext.uniformmatrix[234]x[234]fv() methods specifying matrix values for uniform variables. webgl2renderingcontext.vertexattribi4[u]i[v]() methods specifying integer values for generic ...
...And 6 more matches

Signaling and video calling - Web APIs
n the two. here's the expected sequence of events: we'll see this detailed more over the course of this article. ice candidate exchange process when each peer's ice layer begins to send candidates, it enters into an exchange among the various points in the chain that looks like this: each side sends candidates to the other as it receives them from their local ice layer; there is no taking turns or batching of candidates. as soon as the two peers agree upon one candidate that they can both use to exchange the media, media begins to flow. each peer continues to send candidates until it runs out of options, even after the media has already begun to flow. this is done in hopes of identifying even better options than the one initially selected. if conditions change—for example the networ...
...o: true, // we want an audio track video: true // ...and we want a video track }; function invite(evt) { if (mypeerconnection) { alert("you can't start a call because you already have one open!"); } else { var clickedusername = evt.target.textcontent; if (clickedusername === myusername) { alert("i'm afraid i can't let you talk to yourself. ...
...he variable targetusername and call createpeerconnection(), a function which will create and do basic configuration of the rtcpeerconnection. once the rtcpeerconnection has been created, we request access to the user's camera and microphone by calling mediadevices.getusermedia(), which is exposed to us through the navigator.mediadevices.getusermedia property. when this succeeds, fulfilling the returned promise, our then handler is executed. it receives, as input, a mediastream object representing the stream with audio from the user's microphone and video from their webcam. note: we could restrict the set of permitted media inputs to a specific device or set of devices by calling navigator.mediadevices.enumeratedevices() to get a list of devices, filtering the resulting list based on our des...
...And 6 more matches

Web Authentication API - Web APIs
ser in or as a form of second-factor authentication. please note: both create() and get() require a secure context (e.g. - the server is connected by https or is the localhost), and will not be available for use if the browser is not operating in a secure context. in their most basic forms, both create() and get() receive a very large random number called a challenge from the server and they return the challenge signed by the private key back to the server. this proves to the server that a user is in possession of the private key required for authentication without revealing any secrets over the network. in order to understand how the create() and get() methods fit into the bigger picture, it is important to understand that they sit between two components that are outside the browser: s...
... in the publickeycredentialcreationoptions dictionary. likewise, the full set of response fields can be found in the publickeycredential interface (where publickeycredential.response is the authenticatorattestationresponse interface). note most javascript programmers that are creating an application will only really care about steps 1 and 5 where the create() function is called and subsequently returns; however, steps 2, 3, and 4 are essential to understanding the processing that takes place in the browser and authenticator and what the resulting data means. figure 1 - a diagram showing the sequence of actions for a web authentication registration and the essential data associated with each action. the registration steps are: application requests registration - the application makes the...
...t specified and is outside of the scope of the web authentication api. typically, server communications would be rest over https (probably using xmlhttprequest or fetch), but they could also be soap, rfc 2549 or nearly any other protocol provided that the protocol is secure. the parameters received from the server will be passed to the create() call, typically with little or no modification and returns a promise that will resolve to a publickeycredential containing an authenticatorattestationresponse. note that it is absolutely critical that the challenge be a buffer of random information (at least 16 bytes) and it must be generated on the server in order to ensure the security of the registration process. browser calls authenticatormakecredential() on authenticator - internally, the browser ...
...And 6 more matches

WindowOrWorkerGlobalScope.setTimeout() - Web APIs
ee reasons for delays longer than specified below. arg1, ..., argn optional additional arguments which are passed through to the function specified by function. note: passing additional parameters to the function in the first syntax does not work in internet explorer 9 and below. if you want to enable this functionality on that browser, you must use a polyfill (see the polyfill section). return value the returned timeoutid is a positive integer value which identifies the timer created by the call to settimeout(); this value can be passed to cleartimeout() to cancel the timeout. it may be helpful to be aware that settimeout() and setinterval() share the same pool of ids, and that cleartimeout() and clearinterval() can technically be used interchangeably. for clarity, however, you shoul...
...function() { vcallback.apply(null, aargs); } : vcallback, ndelay); }; }, 0, 'test'); var interval = setinter...
...= window.setinterval(code, delay); |*| \*/ (function() { settimeout(function(arg1) { if (arg1 === 'test') { // feature test is passed, no need for polyfill return; } var __nativest__ = window.settimeout; window.settimeout = function(vcallback, ndelay /*, argumenttopass1, argumenttopass2, etc. ...
...And 6 more matches

XMLHttpRequest - Web APIs
etter choice. constructor xmlhttprequest() the constructor initializes an xmlhttprequest. it must be called before any other method calls. properties this interface also inherits properties of xmlhttprequesteventtarget and of eventtarget. xmlhttprequest.onreadystatechange an eventhandler that is called whenever the readystate attribute changes. ...
...est. it must be called before any other method calls. properties this interface also inherits properties of xmlhttprequesteventtarget and of eventtarget. xmlhttprequest.onreadystatechange an eventhandler that is called whenever the readystate attribute changes. xmlhttprequest.readystate read only returns an unsigned short, the state of the request. xmlhttprequest.response read only returns an arraybuffer, blob, document, javascript object, or a domstring, depending on the value of xmlhttprequest.responsetype, that contains the response entity body. xmlhttprequest.responsetext read only returns a domstring that contains the response to the request as text, or null if the request was unsuccessful or has not yet been sent. xmlhttprequest.responsetype is an enumerated value that ...
...depending on the value of xmlhttprequest.responsetype, that contains the response entity body. xmlhttprequest.responsetext read only returns a domstring that contains the response to the request as text, or null if the request was unsuccessful or has not yet been sent. xmlhttprequest.responsetype is an enumerated value that defines the response type. xmlhttprequest.responseurl read only returns the serialized url of the response or the empty string if the url is null. ...
...And 6 more matches

<input type="file"> - HTML: Hypertext Markup Language
attribute, as shown above, specifies that multiple files can be chosen at once. the user can choose multiple files from the file picker in any way that their chosen platform allows (e.g. by holding down shift or control, and then clicking). if you only want the user to choose a single file per <input>, omit the multiple attribute. getting information on selected files the selected files' are returned by the element's htmlinputelement.files property, which is a filelist object containing a list of file objects. the filelist behaves like an array, so you can check its length property to get the number of selected files. each file object contains the following information: name the file's name. lastmodified a number specifying the date and time at which the file was last modified, in mi...
...loop through each one, printing information about it into the preview <div>. things to note here: we use the custom validfiletype() function to check whether the file is of the correct type (e.g. the image types specified in the accept attribute). if it is, we: print out its name and file size into a list item inside the previous <div> (obtained from file.name and file.size). the custom returnfilesize() function returns a nicely-formatted version of the size in bytes/kb/mb (by default the browser reports the size in absolute bytes). generate a thumbnail preview of the image by calling url.createobjecturl(curfiles[i]). then, insert the image into the list item too by creating a new <img> and setting its src to the thumbnail. if the file type is invalid, we display a message ins...
...update your selection.`; listitem.appendchild(para); } list.appendchild(listitem); } ...
...And 6 more matches

Meta programming - JavaScript
s (e.g. property lookup, assignment, enumeration, function invocation, etc). with the help of these two objects you are able to program at the meta level of javascript. proxies introduced in ecmascript 6, proxy objects allow you to intercept certain operations and to implement custom behaviors. for example, getting a property on an object: let handler = { get: function(target, name) { return name in target? target[name] : 42 } } let p = new proxy({}, handler) p.a = 1 console.log(p.a, p.b) // 1, 42 the proxy object defines a target (an empty object here) and a handler object, in which a get trap is implemented. here, an object that is proxied will not return undefined when getting undefined properties, but will instead return the number 42. additional examples are available on t...
...e following table summarizes the available traps available to proxy objects. see the reference pages for detailed explanations and examples. handler / trap interceptions invariants handler.getprototypeof() object.getprototypeof() reflect.getprototypeof() __proto__ object.prototype.isprototypeof() instanceof getprototypeof method must return an object or null. if target is not extensible, object.getprototypeof(proxy) method must return the same value as object.getprototypeof(target). handler.setprototypeof() object.setprototypeof() reflect.setprototypeof() if target is not extensible, the prototype parameter must be the same value as object.getprototypeof(target). handler.isextensible() ob...
...ethod must return the same value as object.getprototypeof(target). handler.setprototypeof() object.setprototypeof() reflect.setprototypeof() if target is not extensible, the prototype parameter must be the same value as object.getprototypeof(target). handler.isextensible() object.isextensible() reflect.isextensible() object.isextensible(proxy) must return the same value as object.isextensible(target). handler.preventextensions() object.preventextensions() reflect.preventextensions() object.preventextensions(proxy) only returns true if object.isextensible(proxy) is false. handler.getownpropertydescriptor() object.getownpropertydescriptor() reflect.getownpropertydescriptor() getownpropertydescriptor m...
...And 6 more matches

Array.prototype.findIndex() - JavaScript
the findindex() method returns the index of the first element in the array that satisfies the provided testing function. otherwise, it returns -1, indicating that no element passed the test. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. see also the find() method, which returns the value of an array element, instead of its index. syntax arr.findindex(callback( element[, index[, array]] )[, thisarg]) parameters callback a function to execute on each value in the array until the function returns true, indicating that the satisfying element was found. it takes three arguments: element the current e...
... until the function returns true, indicating that the satisfying element was found. it takes three arguments: element the current element being processed in the array. index optional the index of the current element being processed in the array. array optional the array findindex() was called upon. thisarg optional optional object to use as this when executing callback. return value the index of the first element in the array that passes the test. otherwise, -1. description the findindex() method executes the callback function once for every index in the array until it finds the one where callback returns a truthy value. if such an element is found, findindex() immediately returns the element's index. ...
... edge case alert: unlike other array methods such as array.some(), callback is run even for indexes with unassigned values. ...
...And 6 more matches

Array.prototype.some() - JavaScript
the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax arr.some(callback(element[, index[, array]])[, thisarg]) parameters callback a function to test for each element, taking three arguments: element the current element being processed in the array. indexoptional the index of the current element being processed in the array. ...
...(element[, index[, array]])[, thisarg]) parameters callback a function to test for each element, taking three arguments: element the current element being processed in the array. indexoptional the index of the current element being processed in the array. arrayoptional the array some() was called upon. thisargoptional a value to use as this when executing callback. ...
...ameters callback a function to test for each element, taking three arguments: element the current element being processed in the array. indexoptional the index of the current element being processed in the array. arrayoptional the array some() was called upon. thisargoptional a value to use as this when executing callback. return value true if the callback function returns a truthy value for at least one element in the array. otherwise, false. description the some() method executes the callback function once for each element present in the array until it finds the one where callback returns a truthy value (a value that becomes true when converted to a boolean). if such an element is found, some() immediately returns true. otherwise, some() returns false. callbac...
...And 6 more matches

JSON.parse() - JavaScript
the json.parse() method parses a json string, constructing the javascript value or object described by the string. an optional reviver function can be provided to perform a transformation on the resulting object before it is returned. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax json.parse(text[, reviver]) parameters text the string to parse as json. ...
...contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax json.parse(text[, reviver]) parameters text the string to parse as json. see the json object for a description of json syntax. reviver optional if a function, this prescribes how the value originally produced by parsing is transformed, before being returned. return value the object, array, string, number, boolean, or null value corresponding to the given json text. exceptions throws a syntaxerror exception if the string to parse is not valid json. polyfill // from https://github.com/douglascrockford/json-js/blob/master/json2.js if (typeof json.parse !== "function") { var rx_one = /^[\],:{}\s]*$/; var rx_two = /\\(?:["\\\/bfnrt]|u[0-...
... var j; function walk(holder, key) { // the walk method is used to recursively walk the resulting structure so // that modifications can be made. var k; var v; var value = holder[key]; if (value && typeof value === "object") { ...
...And 6 more matches

Math.clz32() - JavaScript
the math.clz32() function returns the number of leading zero bits in the 32-bit binary representation of a number. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax math.clz32(x) parameters x a number. return value the number of leading zero bits in the 32-bit binary representation of the given number. description "clz32" is short for countleadingzeroes32. if x is not a number, then it will be converted to a number first, then converted to a 32-bit unsigned integer. if the converted 32-bit unsigned integer is 0, then return 32, because all bits are 0. this function is particularly useful for syste...
...the ctrz function below fills in all the high bits with the lowest filled bit, then negates the bits to erase all higher set bits so that clz can then be used. var clz = math.clz32; function ctrz(integer){ // count trailing zeros // 1. fill...
...s to erase all higher set bits so that clz can then be used. var clz = math.clz32; function ctrz(integer){ // count trailing zeros // 1. fill in all the higher bits after the first one integer |= integer << 16; integer |= integer << 8; integer |= integer << 4; integer |= integer << 2; integer |= integer << 1; // 2. now, inversing the bits reveals the lowest bits return 32 - clz(~integer) |0; // `|0` ensures integer coercion } function ctron(integer){ // count trailing ones // no shift-filling-in-with-ones operator is available in // javascript, so the below code is the fastest return ctrz(~integer); /* alternate implementation for demonstrational purposes: // 1. erase all the higher bits after the first zero integer &= (integer << ...
...And 6 more matches

Promise.all() - JavaScript
the promise.all() method takes an iterable of promises as an input, and returns a single promise that resolves to an array of the results of the input promises. this returned promise will resolve when all of the input's promises have resolved, or if the input iterable contains no promises. it rejects immediately upon any of the input promises rejecting or non-promises throwing an error, and will reject with this first rejection message / error. the source for this interactive demo is stored in a github repository. if you'd like to contribute to the interactive demo project, please clone https://github.com/mdn/interactive-examples and send us a pull request. ...
...ses throwing an error, and will reject with this first rejection message / error. the source for this interactive demo is stored in a github repository. if you'd like to contribute to the interactive demo project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax promise.all(iterable); parameters iterable an iterable object such as an array. ...
...te to the interactive demo project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax promise.all(iterable); parameters iterable an iterable object such as an array. return value an already resolved promise if the iterable passed is empty. an asynchronously resolved promise if the iterable passed contains no promises. note, google chrome 58 returns an already resolved promise in this case. a pending promise in all other cases. ...
...And 6 more matches

String.prototype.charCodeAt() - JavaScript
if you want the entire code point value, use codepointat(). ...
...o contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. the utf-16 code unit matches the unicode code point for code points which can be represented in a single utf-16 code unit. ...
... a single utf-16 code unit (because its value is greater than 0xffff) then the code unit returned will be the first part of a surrogate pair for the code point. if you want the entire code point value, use codepointat(). syntax str.charcodeat(index) parameters index an integer greater than or equal to 0 and less than the length of the string. if index is not a number, it defaults to 0. return value a number representing the utf-16 code unit value of the character at the given index. if index is out of range, charcodeat() returns nan. description unicode code points range from 0 to 1114111 (0x10ffff). the first 128 unicode code points are a direct match of the ascii character encoding. ...
...And 6 more matches

String.prototype.match() - JavaScript
project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax str.match(regexp) parameters regexp a regular expression object. if regexp is a non-regexp object, it is implicitly converted to a regexp by using new regexp(regexp). if you don't give any parameter and use the match() method directly, you will get an array with an empty string: [""]. ...
...plicitly converted to a regexp by using new regexp(regexp). if you don't give any parameter and use the match() method directly, you will get an array with an empty string: [""]. return value an array whose contents depend on the presence or absence of the global (g) flag, or null if no matches are found. if the g flag is used, all results matching the complete regular expression will be returned, but capturing groups will not. if the g flag is not used, only the first complete match and its related capturing groups are returned. in this case, the returned item will have additional properties as described below. additional properties as explained above, some results contain additional properties as described below. groups an object of named capturing groups whose keys are the na...
...w. groups an object of named capturing groups whose keys are the names and values are the capturing groups or undefined if no named capturing groups were defined. see groups and ranges for more information. index the index of the search at which the result was found. input a copy of the search string. description if the regular expression does not include the g flag, str.match() will return the same result as regexp.exec(). other methods if you need to know if a string matches a regular expression regexp, use regexp.test(). if you only want the first match found, you might want to use regexp.exec() instead. if you want to obtain capture groups and the global flag is set, you need to use regexp.exec() or string.prototype.matchall() instead. examples using match() in the fol...
...And 6 more matches

parseFloat() - JavaScript
the parsefloat() function parses an argument (converting it to a string first if needed) and returns a floating point number. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax parsefloat(string) parameters string the value to parse. if this argument is not a string, then it is converted to one using the tostring abstract operation. leading whitespace in this argument is ignored. return value a floating point number parsed from the given string. or nan when the first non-whitespace character cannot be converted to a number. description parsefloat is a top-level function and not a method of any object...
... return value a floating point number parsed from the given string. or nan when the first non-whitespace character cannot be converted to a number. description parsefloat is a top-level function and not a method of any object. if parsefloat encounters a character other than a plus sign (+), minus sign (- u+002d hyphen-minus), numeral (0–9), decimal point (.), or exponent (e or e), it returns the value up to that character, ignoring the invalid character and characters following it. a second decimal point also stops parsing (characters up to that point will still be parsed). leading and trailing spaces in the argument are ignored. if the argument’s first character can’t be converted to a number (it’s not any of the above characters), parsefloat returns nan. parsefloat can a...
...o that character, ignoring the invalid character and characters following it. a second decimal point also stops parsing (characters up to that point will still be parsed). leading and trailing spaces in the argument are ignored. if the argument’s first character can’t be converted to a number (it’s not any of the above characters), parsefloat returns nan. parsefloat can also parse and return infinity. ...
...And 6 more matches

Logical OR (||) - JavaScript
the logical or (||) operator (logical disjunction) for a set of operands is true if and only if one or more of its operands is true. it is typically used with boolean (logical) values. when it is, it returns a boolean value. however, the || operator actually returns the value of one of the specified operands, so if this operator is used with non-boolean values, it will return a non-boolean value. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax expr1 || expr2 description if expr1 can be converted to true, returns expr1; else, returns expr2. if a value can be converted to true, the value is so-called truth...
...a value can be converted to true, the value is so-called truthy. if a value can be converted to false, the value is so-called falsy. examples of expressions that can be converted to false are: null; nan; 0; empty string ("" or '' or ``); undefined. even though the || operator can be used with operands that are not boolean values, it can still be considered a boolean operator since its return value can always be converted to a boolean primitive. to explicitly convert its return value (or any expression in general) to the corresponding boolean value, use a double not operator or the boolean constructor. short-circuit evaluation the logical or expression is evaluated left to right, it is tested for possible "short-circuit" evaluation using the following rule: (some truthy expression)...
...ort-circuit evaluated to the truthy expression. short circuit means that the expr part above is not evaluated, hence any side effects of doing so do not take effect (e.g., if expr is a function call, the calling never takes place). this happens because the value of the operator is already determined after the evaluation of the first operand. see example: function a(){ console.log('called a'); return false; } function b(){ console.log('called b'); return true; } console.log( b() || a() ); // logs "called b" due to the function call, // then logs true (which is the resulting value of the operator) operator precedence the following expressions might seem equivalent, but they are not, because the && operator is executed before the || operator (see operator precedence). true || false && fals...
...And 6 more matches

Modules - Archive of obsolete content
o; // => 5 // a.js: foo = 3; // b.js: foo = 5; in the above example, the value of foo depends on the order in which the subscripts are loaded: there is no way to access the property foo defined by "a.js", since it is overwritten by "b.js". ...
...each script to be loaded in the scope of their own global object, and then return the global object as its result. in effect, any properties defined by the script being loaded on its global object are exported to the loading script. the script loader we obtained from components allows us to do just that: function loadscript(url) { let global = {}; loader.loadsubscript(url, global); return global; } if present, the loadsubscript function evaluates the script to be loaded in the scope of the second argument. using this new version of loadscript, we can now rewrite our earlier example as follows: // index.js: let a = loadscript("www.foo.com/a.js"); let b = loadscript("www.foo.com/b.js"); a.foo // => 3 b.foo; // => 5 // a.js: foo = 3; // b.js: foo = 5; importing names in additi...
...=> 3 b.foo; // => 5 // a.js: foo = 3; // b.js: foo = 5; importing names in addition to exporting properties from the script being loaded to the loading script, we can also import properties from the loading script to the script being loaded: function loadscript(url, imports) { let global = { imports: imports, exports: {} }; loader.loadsubscript(url, global); return global.exports; } among other things, this allows us to import loadscript to scripts being loaded, allowing them to load further scripts: // index.js: loadscript("www.foo.com/a.js", { loadscript: loadscript }).foo; => 5 // a.js: exports.foo = imports.loadscript("www.foo.com/b.js").bar; // b.js: exports.bar = 5; sandboxes and compartments the loadscript function as defined in the previou...
...And 5 more matches

util/array - Archive of obsolete content
helper functions for working with arrays. globals functions has(array, element) returns true if the given array contains the element or false otherwise. a simplified version of array.indexof(element) >= 0. let { has } = require('sdk/util/array'); let a = ['rock', 'roll', 100]; has(a, 'rock'); // true has(a, 'rush'); // false has(a, 100); // true parameters array : array the array to search. element : * the element to search for in the array. returns boolean : a boolean indicating whether or not the element was found in the array. hasany(array, elements) returns true if the given array contains any of the elements in the elements array, or false otherwise. let { hasany } = require('sdk/util/array'); let a = ['rock', 'roll', 100]; hasany(a, ['rock', 'bright', 'light']); // tr...
...urns true if the given array contains any of the elements in the elements array, or false otherwise. let { hasany } = require('sdk/util/array'); let a = ['rock', 'roll', 100]; hasany(a, ['rock', 'bright', 'light']); // true hasany(a, ['rush', 'coil', 'jet']); // false parameters array : array the array to search for elements. elements : array an array of elements to search for in array. returns boolean : a boolean indicating whether or not any of the elements were found in the array. add(array, element) if the given array does not already contain the given element, this function adds the element to the array and returns true. otherwise, this function does not add the element and returns false. let { add } = require('sdk/util/array'); let a = ['alice', 'bob', 'carol']; add(a, 'dave...
...he array and returns true. otherwise, this function does not add the element and returns false. let { add } = require('sdk/util/array'); let a = ['alice', 'bob', 'carol']; add(a, 'dave'); // true add(a, 'dave'); // false add(a, 'alice'); // false console.log(a); // ['alice', 'bob', 'carol', 'dave'] parameters array : array the array to add the element to. element : * the element to add returns boolean : a boolean indicating whether or not the element was added to the array. remove(array, element) if the given array contains the given element, this function removes the element from the array and returns true. otherwise, this function does not alter the array and returns false. let { remove } = require('sdk/util/array'); let a = ['alice', 'bob', 'carol']; remove(a, 'dave'); // fals...
...And 5 more matches

Interaction between privileged and non-privileged pages - Archive of obsolete content
. note: if you're using html5's postmessage() to send a message from unprivileged code to privileged code, adding 'true' to the end of your event listener in your privileged chrome code will allow the message to be received. document.addeventlistener("message", function(e) { yourfunction(e); }, false, true); sending data from chrome to unprivileged document to "answer" the web page (e.g., return code), your extension can set an attribute or attach child elements on the event target element (<myextensiondataelement/> in this example). you can optionally clean up the created element, or create it once when the web page loads then re-use it each time. another option is to send a return event from the extension to the web page. this can be done using the same principle as the above example...
... { var response = json.parse(request.nodevalue); callback(response); } }, false); document.head.appendchild(request); var event = document.createevent("htmlevents"); event.initevent("something-query", true, false); request.dispatchevent(event); }, callback: function(response) { return alert("response: " + (response ? response.tosource() : response)); } } </script> </head> <body> <button onclick="return something.send_request({foo: 1}, something.callback)">send {foo: 1} with callback</button> <button onclick="return something.send_request({baz: 3}, something.callback)">send {baz: 3} with callback</button> <button onclick="return something.send_...
...</script> </head> <body> <button onclick="return something.send_request({foo: 1}, something.callback)">send {foo: 1} with callback</button> <button onclick="return something.send_request({baz: 3}, something.callback)">send {baz: 3} with callback</button> <button onclick="return something.send_request({mozilla: 3})">send {mozilla: 3} without callback</button> <button onclick="return something.send_request({firefox: 4}, something.callback)">send {firefox: 4} with callback</button> </body> </html> overlay on browser.xul in your extension: var something = { listen_request: function(callback) { // analogue of chrome.extension.onrequest.addlistener document.addeventlistener("something-query", function(event) { var node = event.target; if (!node || node.node...
...And 5 more matches

MCD, Mission Control Desktop, AKA AutoConfig - Archive of obsolete content
lockpref("mail.identity.id1.useremail", mai...
...ned above, i now get the following error message while stating thunderbird with autoconfig (autoconf.js having pref('general.config.filename','thunderbird.cfg'); ) and thunderbird.cfg calling getldap* functions to retrieve cn and mail address of the current user. netscape.cfg/autoconfig failed. please contact your system administrator. error: getldapattibutes failed: [exception... "component returned failure code: 0xc1f30001 (ns_error_not_initialized) [nsildapurl.spec]" nsresult: "0xc1f30001 (ns_error_not_initialized)" location: "js frame :: file:////usr/lib/thunderbird-3.0b2/defaults/autoconfig/prefcalls.js :: getldapattributes :: line 174" data: no] bug 295329 had been re-opened . autoconfig option and ldap support in thunderbird 1.5.x fortunately, autoconfig is now part of thund...
... var env_mozdebug= getenv("mozilla_debug"); if (env_mozdebug) {displayerror("no error , ...
...And 5 more matches

Supporting private browsing mode - Archive of obsolete content
-window private browsing for details. firefox 3.5 introduced private browsing mode, in which potentially private information is not recorded. this includes cookies, history information, download information, and so forth. when private browsing mode is enabled, temporary, databases are created to be used for cookies and local storage; these databases are thrown away when private browsing mode is turned off, and the regular databases are re-activated. the temporary cookie and local storage databases start out empty. extensions that may record potentially private information may wish to hook into the private browsing service so that they can avoid saving personal information when private browsing mode is enabled. doing this is quite easy, using the nsiprivatebrowsingservice interface. detectin...
...ate browsing mode isn't active. let docroot = document.documentelement; if (docroot.hasattribute("privatebrowsingmode")) { // private browsing mode is enabled } if (docroot.getattribute("privatebrowsingmode") == "temporary") { // private browsing mode is temporary } if (docroot.getattribute("privatebrowsingmode") == "permanent") { // private browsing mode is permanent for this session } turning private browsing on and off extensions can turn private browsing mode on and off by manipulating the value of the privatebrowsingenabled attribute. var pbs = components.classes["@mozilla.org/privatebrowsing;1"] .getservice(components.interfaces.nsiprivatebrowsingservice); var oldprivatemode = pbs.privatebrowsingmode; pbs.privatebrowsingenabled = true; /* this is all priva...
... from that point until we restore the original value of the private browsing mode setting, things are done privately. this allows us to, for example, work with the places database without affecting its contents. private browsing notifications there are notifications available that allow you to easily watch for changes to the status of the private...
...And 5 more matches

Reading from Files - Archive of obsolete content
reams. var file = io.getfile("home", "sample.txt"); var stream = io.newinputstream(file, "text"); this example first retrieves a file object using nsiscriptableio.getfile(). in this case, the file 'sample.txt' within the user's home directory is retrieved. next, nsiscriptableio.newinputstream() is called to create a new input stream for reading from the file. this method will open the file and return a stream. naturally, if the file does not exist, an error will occur. you may wish to use nsifile.exists() to check if the file exists before opening it. in fact, it is a good idea to enclose file reading and writing operations within a try-catch block to capture any errors that might occur during the process. see file errors for a list of errors that might occur. the newinputstream method takes ...
...further read from the file will read additional characters after the first 20. the readstring takes one argument, the number of characters to read from the file. note that this is distinct from the number of bytes to read. depending on the character encoding, it is possible that more than 20 bytes will be read from the file in order to retrieve 20 characters from the file. the readstring method returns the string read from the stream. usually this string have a length equal to the number of characters that were requested. however, it may not do, for instance if the end of the file was reached. this doesn't trigger an error, and the string will just be returned containing as many characters as are available. you can use the available method to check if data is available for reading: var file = ...
...g as many characters as are available. you can use the available method to check if data is available for reading: var file = io.getfile("home", "sample.txt"); var stream = io.newinputstream(file, "text"); var str = stream.readstring(stream.available()); stream.close(); in this example, the available method is called to determine the number of available bytes for reading. note that this method returns the number of bytes available, not the number of characters available, because the file hasn't been read and parsed yet, so the actual number of characters isn't known yet. fortunately as a character is always at least one byte long in the default utf-8 encoding, the number of characters will always be equal to or smaller than the number of bytes available. for normal file streams, the available...
...And 5 more matches

How to implement a custom XUL query processor component - Archive of obsolete content
math.random(100000).tostring(); } templateresult.prototype = { queryinterface: xpcomutils.generateqi([components.interfaces.nsixultemplateresult]), // private storage _data: null, // right now our results are flat lists, so no containing/recursion take place iscontainer: false, isempty: true, mayprocesschildren: false, resource: null, type: "simple-item", get id() { return this._id; }, // return the value of that bound variable such as ?name getbindingfor: function(avar) { // strip off the ? from the beginning of the name var name = avar.tostring().slice(1); return this._data[name]; }, // return an object instead of a string for convenient comparison purposes // or null to say just use string value getbindingobjectfor: function(avar) { ...
...._id; }, // return the value of that bound variable such as ?name getbindingfor: function(avar) { // strip off the ? from the beginning of the name var name = avar.tostring().slice(1); return this._data[name]; }, // return an object instead of a string for convenient comparison purposes // or null to say just use string value getbindingobjectfor: function(avar) { return null; }, // called when a rule matches this item. rulematched: function(aquery, arulenode) { }, // the output for a result has been removed and the result is no longer being used by the builder hasbeenremoved: function() { } }; // basic wrapper for nsisimpleenumerator function templateresultset(aarrayofdata) { this._index = 0; this._array = aarrayofdata; } templateresultset.pro...
...s been removed and the result is no longer being used by the builder hasbeenremoved: function() { } }; // basic wrapper for nsisimpleenumerator function templateresultset(aarrayofdata) { this._index = 0; this._array = aarrayofdata; } templateresultset.prototype = { queryinterface: xpcomutils.generateqi([components.interfaces.nsisimpleenumerator]), hasmoreelements: function() { return this._index < this._array.length; }, getnext: function() { return new templateresult(this._array[this._index++]); } }; // the query processor class - implements nsixultemplatequeryprocessor function templatequeryprocessor() { // our basic list of data this._data = [ {name: "mark", age: 36, hair: "brown", eye: "brown"}, {name: "bill", age: 25, hair:...
...And 5 more matches

XBL Example - Archive of obsolete content
getting this custom property, it will need to retrieve the value of the selectedindex attribute of the deck, which holds the number of the currently displayed page. similarly, when setting this property, it will need to change the selectedindex attribute of the deck. in addition, the text widget will need to be updated to display which page is the current one. <property name="page" onget="return parseint(document.getanonymousnodes(this)[0].childnodes[0].getattribute('selectedindex'));" onset="return this.setpage(val);"/> the page property gets its value by looking at the first element of the anonymous array. this returns the vertical box, so to get the deck, we need to get the first child node of the box. the anonymous array isn't used as the deck is not anonymous from the box. fin...
... <xul:button xbl:inherits="label=previoustext" oncommand="parentnode.parentnode.parentnode.page--;"/> <xul:description flex="1"/> <xul:button xbl:inherits="label=nexttext" oncommand="parentnode.parentnode.parentnode.page++;"/> because the 'page' property is only on the outer xul element, we need to to use the parentnode property to get to it. the first parentnode returns the parent of the button which is the horizontal box, the second its parent, the vertical box, and finally, its parent which is the outer box. the 'page' property is incremented or decremented. this will call the onget script to get the value, increment or decrement the value by one, and then call the onset handler to set the value. setpage method now let's define the 'setpage' method. it will...
...ter, the page number to set the page to. it will need to make sure the page is not out of range and then modify the deck's selectedindex attribute and the text widget's label attribute. <method name="setpage"> <parameter name="newidx"/> <body> <![cdata[ var thedeck=document.getanonymousnodes(this)[0].childnodes[0]; var totalpages=this.childnodes.length; if (newidx<0) return 0; if (newidx>=totalpages) return totalpages; thedeck.setattribute("selectedindex",newidx); document.getanonymousnodes(this)[0].childnodes[1].childnodes[1] .setattribute("value",(newidx+1)+" of "+totalpages); return newidx; ]]> </body> </method> this function is called setpage and takes one parameter newidx. the body of the method has been enclosed in...
...And 5 more matches

browser - Archive of obsolete content
ultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata addprogresslistener( listener ) return type: no return value add a progress listener to the browser which will monitor loaded documents. the progress listener should implement the nsiwebprogresslistener interface. goback() return type: no return value go back one page in the history. goforward() return type: no return value go forward one page in the history. gohome() return type: no return value load the user's...
...use a positive number to go forward and a negative number to go back. ...
...use a positive number to go forward and a negative number to go back. note: this is the xul method on <browser> / <tabbrowser>, not the global function in chrome://browser/content/browser.js. ...
...And 5 more matches

panel - Archive of obsolete content
/> <menuitem label="submenu2 item 2"/> </menupopup> </menu> <menupopup/> onpopuphiding type: script code this event is sent to a popup when it is about to be hidden. onpopupshowing type: script code this event is sent to a popup just before it is opened. this handler is usually used to dynamically set the contents when the user requests to display it. returning false from this event handler prevents the popup from appearing. onpopupshown type: script code this event is sent to a popup after it has been opened, much like the onload event is sent to a window when it is opened. position type: string the position attribute determines where the popup appears relative to the element the user clicked to invoke the popup. this allows you to...
... if both x and y have the value -1 the call will realign the popup with its anchor node. openpopup( anchor , position , x , y , iscontextmenu, attributesoverride, ...
... if both x and y have the value -1 the call will realign the popup with its anchor node. openpopup( anchor , position , x , y , iscontextmenu, attributesoverride, triggerevent ) ...
...And 5 more matches

Choosing the right approach - Learn web development
understanding of javascript fundamentals. objective: to be able to make a sound choice of when to use different asynchronous programming techniques. asynchronous callbacks generally found in old-style apis, involves a function being passed into another function as a parameter, which is then invoked when an asynchronous operation has been completed, so that the callback can in turn do something with the result. this is the precursor to promises; it's not as efficient or flexible. use only when necessary. useful for... single delayed operation repeating operation multiple sequential operations multiple simultaneous operations no yes (recursive callbacks) yes (nested callbacks) no code example an example that loads a resource ...
... 7 full support 6.1prefixed prefixed implemented with the vendor prefix: webkitsamsung internet android full support 1.5 full support 1.5 full support 1.0prefixed prefixed implemented with the vendor prefix: webkitreturn valuechrome full support 23edge full support 12firefox full support 11ie full support 10opera full support 15safari full support ...
... and added to local db."); }).catch(function (err) { if (err.name == 'conflict') { localdb.get(element.doc._id).then(function (resp) { localdb.remove(resp._id, resp._rev).then(function (resp) { // et cetera... ...
...And 5 more matches

Introducing asynchronous JavaScript - Learn web development
ases it has. synchronous javascript to allow us to understand what asynchronous javascript is, we ought to start off by making sure we understand what synchronous javascript is. this section recaps some of the information we saw in the previous article. a lot of the functionality we have looked at in previous learning area modules is synchronous — you run some code, and the result is returned as soon as the browser can do so. let's look at a simple example (see it live here, and see the source): const btn = document.queryselector('button'); btn.addeventlistener('click', () => { alert('you clicked me!'); let pelem = document.createelement('p'); pelem.textcontent = 'this is a newly-added paragraph.'; document.body.appendchild(pelem); }); in this block, the lines are execut...
...ul for demonstrating a synchronous blocking operation, is terrible for use in real world applications. asynchronous javascript for reasons illustrated earlier (e.g. related to blocking), many web api features now use asynchronous code to run, especially those that access or fetch some kind of resource from an external device, such as fetching a file from the network, accessing a database and returning data from it, accessing a video stream from a web cam, or broadcasting the display to a vr headset. why is this difficult to get to work using synchronous code? let's look at a quick example. when you fetch an image from a server, you can't return the result immediately. that means that the following (pseudocode) wouldn't work: let response = fetch('myimage.png'); let blob = response.blob();...
...k: let response = fetch('myimage.png'); let blob = response.blob(); // display your image blob in the ui somehow that's because you don't know how long the image will take to download, so when you come to run the second line it will throw an error (possibly intermittently, possibly every time) because the response is not yet available. instead, you need your code to wait until the response is returned before it tries to do anything else to it. there are two main types of asynchronous code style you'll come across in javascript code, old-style callbacks and newer promise-style code. in the below sections we'll review each of these in turn. async callbacks async callbacks are functions that are specified as arguments when calling a function which will start executing code in the background.
...And 5 more matches

Functions — reusable blocks of code - Learn web development
browser functions we've made use of functions built in to the browser a lot in this course. ...
... the javascrip...
...love', 'chocolate', 'frogs']; let madeastring = myarray.join(' '); console.log(madeastring); // the join() function takes an array, joins // all the array items together into a single // string, and returns this new string or every time we generated a random number: let mynumber = math.random(); // the random() function generates a random number between // 0 and up to but not including 1, and returns that number ...we were using a function! note: feel free to enter these lines into your browser's javascript console to re-familiarize yourself with their functionality, if needed. the javascript language has many built-in functions to allow you to do useful things without having to write all that code yourself. in fact, some of the code you are calling when you invoke (a fancy word for run...
...And 5 more matches

Arrays - Learn web development
and printing out the total price at the bottom. if we didn't have arrays, we'd have to store every item in a separate variable, then call the code that does the printing and adding separately for each item. this would be much longer to write out, less efficient, and more error-prone. if we had 10 items to add to the invoice it would already be annoying, but what about 100 items, or 1000? we'll return to this example later on in the article. as in previous articles, let's learn about the real basics of arrays by entering some examples into browser developer console. creating arrays arrays consist of square brackets and elements that are separated by commas. suppose we want to store a shopping list in an array. paste the following code into the console: let shopping = ['bread', 'milk',...
...another only strings. for example: let sequence = [1, 1, 2, 3, 5, 8, 13]; let random = ['tree', 795, [0, 1, 2]]; before proceeding, create a few example arrays. accessing and modifying array items you can then access individual items in the array using bracket notation, in the same way that you accessed the letters in a string. enter the following into your console: shopping[0]; // returns "bread" you can also modify an item in an array by simply giving a single array item a new value. try this: shopping[0] = 'tahini'; shopping; // shopping will now return [ "tahini", "milk", "cheese", "hummus", "noodles" ] note: we've said it before, but just as a reminder — computers start counting from 0! note that an array inside an array is called a multidimensional array. you ca...
...; try making some more modifications to your array examples before moving on. play around a bit, and see what works and what doesn't. finding the length of an array you can find out the length of an array (how many items are in it) in exactly the same way as you find out the length (in characters) of a string — by using the length property. try the following: shopping.length; // should return 5 this has other uses, but it is most commonly used to tell a loop to keep going until it has looped through all the items in an array. so for example: let sequence = [1, 1, 2, 3, 5, 8, 13]; for (let i = 0; i < sequence.length; i++) { console.log(sequence[i]); } you'll learn about loops properly later on (in our looping code article), but briefly, this code is saying: start looping at ite...
...And 5 more matches

What went wrong? Troubleshooting JavaScript - Learn web development
re often harder to fix than syntax errors, as there usually isn't an error message to direct you to the source of the error. okay, so it's not quite that simple — there are some other differentiators as you drill down deeper. but the above classifications will do at this early stage in your career. we'll look at both of these types going forward. an erroneous example to get started, let's return to our number guessing game — except this time we'll be exploring a version that has some deliberate errors introduced. go to github and make yourself a local copy of number-game-errors.html (see it running live here). to get started, open the local copy inside your favorite text editor, and your browser. try playing the game — you'll notice that when you press the "submit guess" button, ...
...ector. looking further up our file, we can find the paragraph in question: <p class="loworhi"></p> so we need a class selector here, which begins with a dot (.), but the selector being passed into the queryselector() method in line 48 has no dot. this could be the problem! try changing loworhi to .loworhi in line 48. try saving and refreshing again, and your console.log() statement should return the <p> element we want. phew! another error fixed! you can delete your console.log() line now, or keep it to reference later on — your choice. note: see our typeerror: "x" is (not) "y" reference page for more details about this error. syntax errors round three now if you try playing the game through again, you should get more success — the game should play through absolutely fine, un...
...just need to change addeventlistener to .addeventlistener. do this now. a logic error at this point, the game should play through fine, however after playing through a few times you'll undoubtedly notice that the "random" number you've got to guess is always 1. definitely not quite how we want the game to play out! there's definitely a problem in the game logic somewhere — the game is not returning an error; it just isn't playing right. search for the randomnumber variable, and the lines where the random number is first set. the instance that stores the random number that we want to guess at the start of the game should be around line number 44: let randomnumber = math.floor(math.random()) + 1; and the one that generates the random number before each subsequent game is around lin...
...And 5 more matches

Routing in Ember - Learn web development
e", "completed", or "index"), will render the <todolist /> component. the location in the page where <todolist /> is rendered is determined by the {{ outlet }} inside the parent route, which in this case is application.hbs. so we have our routes in place. great! but now we need a way to differentiate between each of these routes, so that they show what they are supposed to show. ...
...ation in the page where <todolist /> is rendered is determined by the {{ outlet }} inside the parent route, which in this case is application.hbs. so we have our routes in place. great! but now we need a way to differentiate between each of these routes, so that they show what they are supposed to show. first of all, return once more to our todo-data.js file. it already contains a getter that returns all todos, and a getter that returns incomplete todos. the getter we are missing is one to return just the completed todos. add the following below the existing getters: get completed() { return this.todos.filter(todo => todo.iscompleted); } models now we need to add models to our route javascript files to allow us to easily return specific data sets to display in those models. model is a d...
... deeper. we also provide access to the service, like we did for the components. the index route model first of all, update todomvc/app/routes/index.js so it looks as follows: import route from '@ember/routing/route'; import { inject as service } from '@ember/service'; export default class indexroute extends route { @service('todo-data') todos; model() { let todos = this.todos; return { get alltodos() { return todos.all; } } } } we can now update the todomvc/app/templates/index.hbs file so that when it includes the <todolist /> component, it does so explicitly with the available model, calling its alltodos() getter to make sure all of the todos are shown. in this file, change <todolist /> to <todolist @todos={{ @model.alltodos }}/> the completed...
...And 5 more matches

TypeScript support in Svelte - Learn web development
not a number it will complain about it: the application template has a validate script configured that runs svelte-check against your code. this package allows you to detect errors and warnings normally displayed by a code editor from the command line, which makes it pretty useful for running it in a continuous integration (ci) pipeline. just run npm run validate to check for unused css, and return a11y hints and typescript compile errors. in this case, if you run npm run validate (either in the vs code console or terminal) you will get the following error: even better, if you run it from the vs code integrated terminal (you can open it with the ctrl + ` keyboard shortcut), cmd/ctrl + clicking on the file name will take you to the line containing the error. you can also run the validat...
... only the attributes of the todo that have been updated. that means it's not a complete todo — it only has a subset of a todo's properties. for these kinds of cases, typescript provides several utility types to make it easier to apply these common transformations. what we need right now is the partial<t> utility, which allows us to represent all subsets of a given type. the partial utility returns a new type based on the type t, where every property of t is optional. we'll use it in the update() function — update yours like so: function update(updatedtodo: partial<todotype>) { todo = { ...todo, ...updatedtodo } // applies modifications to todo dispatch('update', todo) // emit update event } with this we are telling typescript that the updatedtodo variable wi...
...remember that imports in typescript don't include the file extension. in each case it should end up like this: import { selectonfocus } from '../actions' migrating the...
...And 5 more matches

Working with Svelte stores - Learn web development
will update accordingly. then we call the method alert.subscribe(), passing it a callback function as a parameter. whenever the value of the store changes, the callback function will be called with the new value as its parameter. in the callback function we just assign the value we receive to the local variable, which will trigger the update of the component's dom. the subscribe() method also returns a clean-up function, which takes care of releasing the subscription. so we subscribe when the component is being initialized, and use ondestroy to unsubscribe when the component is unmounted. finally we use the alertcontent variable in our markup, and if the user clicks on the alert we clean it. at the end we include a few css lines to style our alert component. this setup allows us to work ...
...ment a store contract: the theory you can create your own stores without relying on svelte/store by implementing the store contract. its features must work like so: a store must contain a subscribe() method, which must accept as its argument a subscription function. all of a store's active subscription functions must be called whenever the store's value changes. the subscribe() method must return an unsubscribe() function, which when called must stop its subscription. a store may optionally contain a set() method, which must accept as its argument a new value for the store, and which synchronously calls all of the store's active subscription functions. a store with a set() method is called a writable store. first of all, let's add the following console.log() statements to our app.svelt...
...itable = (initial_value = 0) => { let value = initial_value // content of the store let subs = [] // subscriber's handlers const subscribe = (handler) => { subs = [...subs, handler] // add handler to the array of subscribers handler(value) // call handler with current value return () => subs = subs.filter(sub => sub !== handler) // return unsubscribe function } const set = (new_value) => { if (value === new_value) return // same value, exit value = new_value // update value subs.foreach(sub => sub(value)) // update subscribers } const update = (update_fn) => set(update_fn(value)) // update function return {...
...And 5 more matches

gettext
for string which are supposed to support plurals. for instance, in php the default keyword for regular messages is gettext() and _(). for messages with plural support, the default keyword is ngettext(). a definition of a string with plurals takes three arguments: the singular form of the english string, the plural form of the english string, and the number basing on which the function will return the correct (singular or plural) form of the string. consider the following code snippet: <?php $num = 1; printf(ngettext("%d user likes this.", "%d users like this.", $num), $num); ?> depending on the value of the $num variable, this code will either use the singular ("user likes) or the plural ("users like") form of the string. notice that you need to pass the $num variable twice. first i...
...?php $num = 1; printf(ngettext("%d user likes this.", "%d users like this.", $num), $num); ?> depending on the value of the $num variable, this code will either use the singular ("user likes) or the plural ("users like") form of the string. notice that you need to pass the $num variable twice. first in the ngettext() call, where it will be used to determine which form of the string will be returned. in the above example, $num equals 1, so the string returned (for english) will be %d user likes this. the second time the $num variable is passed in the printf() call, which at this point of interpretation looks something like printf("%d user likes this.", $num);. the %d in the first argument (which is the string returned by gettext) will be replaced with the value of $num. for english, the ab...
...ll produce the following output: 1 user likes this. the string definition in the messages.po file will look like this: #: file.php:3 #, php-format msgid "%d user likes this." msgid_plural "%d users like this." msgstr[0] "" msgstr[1] "" depending on the localizer's target language and its rules for creating plural forms, there might be another field for translation, e.g. msgstr[2]. gettext will return one of the msgstrs, depending on the number passed to the gettext function in the code ($num in the above example). to determine which form to return, gettext uses a plural rule, which should be declared in the po file header. for example, for english, the plural rule is of the following form: plural-forms: nplurals=2; plural=n != 1; the first part defines the number of different plural forms (2...
...And 5 more matches

GC Rooting Guide
js::mutablehandle<jsstring*> js::mutablehandlestring js::mutablehandle<jsscript*> js::mutablehandlescript js::mutablehandle<jsid> js::mutablehandleid js::mutablehandle<t> should be used for all out-parameters, for example instead of: bool maybegetvalue(jscontext *cx, js::value* valueout) { // ... ...
...context *cx, js::value* valueout) { // ... if (!waserror) *valueout = resultvalue; return waserror; } void otherfunction(jscontext *cx) { js::value value; bool success = maybegetvalue(cx, &value); // ... } you should write: bool maybegetvalue(jscontext *cx, js::mutablehandlevalue valueout) { // ... if (!waserror) valueout.set(resultvalue); return waserror; } void otherfunction(jscontext *cx) { js::rootedvalue value(cx); bool success = maybegetvalue(cx, &value); // ... ...
...text *cx) { js::value value; bool success = maybegetvalue(cx, &value); // ... } you should write: bool maybegetvalue(jscontext *cx, js::mutablehandlevalue valueout) { // ... if (!waserror) valueout.set(resultvalue); return waserror; } void otherfunction(jscontext *cx) { js::rootedvalue value(cx); bool success = maybegetvalue(cx, &value); // ... } return values it's ok to return raw pointers! these do not need to be wrapped in any of rooting classes, but they should be immediately used to initialize a js::rooted<t> if there is any code that could gc before the end of the containing function; a raw pointer must never be stored on the stack during a gc. one rare but especially tricky case to watch out for is where an raii destructor could gc in ...
...And 5 more matches

JSAutoByteString
the caller must be in a request on this jscontext. str jsstring * a pointer to jsstring to get initial content by calling js_encodestring(cx, str). methods method description void initbytes(char *bytes) take ownership of the given byte array. char *encodelatin1(jscontext *cx, jsstring *str) call js_encodestring and take ownership of the returned string, and return the string. char *encodelatin1(js::exclusivecontext *cx, jsstring *str) call js::lossytwobytecharstonewlatin1charsz, or allocate string and copy the content of jslinearstring::latin1chars, and take the ownership of the string. this may fail if str is not linear. char *encodeutf8(jscontext *cx, js::handlestring str) call js_encodestringtoutf8 and take o...
...urn the string. char *encodelatin1(js::exclusivecontext *cx, jsstring *str) call js::lossytwobytecharstonewlatin1charsz, or allocate string and copy the content of jslinearstring::latin1chars, and take the ownership of the string. this may fail if str is not linear. ...
... char *encodelatin1(js::exclusivecontext *cx, jsstring *str) call js::lossytwobytecharstonewlatin1charsz, or allocate string and copy the content of jslinearstring::latin1chars, and take the ownership of the string. this may fail if str is not linear. char *encodeutf8(jscontext *cx, js::handlestring str) call js_encodestringtoutf8 and take ownership of the returned string, and return the string. void clear() free the owned string. you should call this before calling encode* methods or initbytes method if a string is already owned, otherwise the string will never be freed. char *ptr() const return a pointer to the owned string. this could be null if no string is owned. bool operator!() const return true if no string is owned. size_t...
...And 5 more matches

Accessing the Windows Registry Using XPCOM
g values, enumerating keys, and receiving notifications access_write — for setting values and creating sub keys access_all — access for all operations in addition to open() and create(), there are the openchild() and createchild() methods. you can call these methods on an already-opened registry key to open a child key. both methods take a relative path and access mode as parameters and return a new object implementing nsiwindowsregkey. here's the simple example again, but using openchild(): var wrk = components.classes["@mozilla.org/windows-registry-key;1"] .createinstance(components.interfaces.nsiwindowsregkey); wrk.open(wrk.root_key_local_machine, "software\\microsoft", wrk.access_read); var subkey = wrk.openchild("windows\\currentversion", wrk...
... to make use of it. reading registry values probably the most common action associated with the windows registry is reading values. the simple example above shows how to read an existing string value. however, windows registry values can have several data types, so you need to ensure that you read the correct type. you can check the type of a value using the method getvaluetype(). this method returns an integer indicating the data type of the value. the data types supported by this interface are defined as named constants on the interface as follows: type_none — probably not useful type_string — a unicode string value type_binary — binary data type_int — a 32 bit integer type_int64 — a 64 bit integer each of these types (except type_none) has a corresponding method to read...
... the value data: readstringvalue() readbinaryvalue() readintvalue() readint64value() since javascript is a dynamically-typed language, you may wish to use the following code to handle all types of data. in this function, wrk is expected to be an already opened nsiwindowsregkey. function readregistryvalue(wrk, value) { switch (wrk.getvaluetype(value)) { case wrk.type_string: return wrk.readstringvalue(value); case wrk.type_binary: return wrk.readbinaryvalue(value); case wrk.type_int: return wrk.readintvalue(value); case wrk.type_int64: return wrk.readint64value(value); } // unknown type return null; } writing registry values writing registry values is quite similar to reading. for each supported data type, there is a write*value() meth...
...And 5 more matches

nsAString (External)
uncate stripchars stripwhitespace trim defaultcomparator compare equals operator< operator<= operator== operator>= operator> operator!= equalsliteral lowercaseequalsliteral find rfind findchar rfindchar appendint tointeger data members no public members. methods beginreading pruint32 beginreading(const prunichar**, const prunichar**) const - source returns the length, beginning, and end of a string in one operation. parameters prunichar** begin prunichar** end prunichar* beginreading() const - source endreading prunichar* endreading() const - source charat prunichar charat(pruint32) const - source parameters pruint32 apos operator[] prunichar operator[](pruint32) const - source parameters pruint32 apos first prunichar ...
...unichar operator[](pruint32) const - source parameters pruint32 apos first prunichar first() const - source beginwriting pruint32 beginwriting(prunichar**, prunichar**, pruint32) - source get the length, begin writing, and optionally set the length of a string all in one operation. @param newsize size the string to this length. pass pr_uint32_max to leave the length unchanged. @return the new length of the string, or 0 if resizing failed. parameters prunichar** begin prunichar** end pruint32 newsize prunichar* beginwriting(pruint32) - source parameters pruint32 <anonymous> endwriting prunichar* endwriting() - source setlength prbool setlength(pruint32) - source parameters pruint32 alen length pruint32 length() const - source isempty prbool isempty...
...onst - source parameters char* aasciistring lowercaseequalsliteral prbool lowercaseequalsliteral(const char*) const - source case-insensitive match this string to a lowercase ascii string. parameters char* aasciistring find print32 find(const nsastring&, print32 (*)(const prunichar*, const prunichar*, pruint32)) const - source find the first occurrence of astr in this string. ...
...And 5 more matches

mozIStorageConnection
rom the last sql insert operation. read only. note: this is not reliable if you are using asynchronous statements or if you are using the connection on multiple threads. schemaversion long the schema version of the database. this should not be used until the database is ready. the version will be reported as 0 if it is not set. transactioninprogress boolean returns true if there is a transaction in progress on the database. otherwise returns false. read only. constants transaction execution time constants. constant value description transaction_deferred 0 no database lock is obtained until the first statement is run. transaction_immediate 1 a reserved lock is obtained on the database. transacti...
..., you will get a read-only clone. note: due to a bug in sqlite, if you use the shared cache (by calling mozistorageservice.opendatabase()), the cloned connection's access privileges will be the same as the original connection, regardless of the value you specify for the areadonly parameter. mozistorageconnection clone( in boolean areadonly optional ); parameters areadonly if true, the returned database connection is in read only mode. this is false by default. return value a new mozistorageconnection object representing the cloned connection. exceptions thrown ns_error_unexpected the connection is to a memory database. close() closes a database connection. before closing the connection, you need to finalize all statements created for the connection. note: you must not cal...
...read and cannot be used to take any synchronous actions on the database. the expression may use "?#" to indicate sequentially numbered parameters (?1, ?2, etc) or ":name" to indicate named parameters. javascript callers should use named parameters. mozistorageasyncstatement createasyncstatement( in autf8string asqlstatement ); parameters asqlstatement the sql statement to execute. return value returns a new mozistorageasyncstatement to be used to execute the specified statement. createfunction() creates a new function that can be used in sql. see mozistoragefunction for sample code and more details. if you use your connection on multiple threads, your function needs to be threadsafe, or it should only be called on one thread. void createfunction( in autf8string afunction...
...And 5 more matches

nsIContentViewer
void stop(); void unload(); obsolete since gecko 1.8 attributes attribute type description container nsisupports domdocument nsidomdocument enablerendering boolean obsolete since gecko 2.0 historyentry nsishentry get the history entry that this viewer will save itself into when destroyed. can return null. read only. istabmodalpromptallowed boolean read only. prescontext nsprescontextptr read only. native code only! note: prior to gecko 10.0 (firefox 10.0 / thunderbird 10.0 / seamonkey 2.7), this attribute was part of nsidocumentviewer. presshell nsipresshellptr read only. native code only! note: prior to gecko...
...hide() will be called, and no further destruction will happen. destroy() void destroy(); parameters none. findcontainerview() finds the view to use as the container view for makewindow. note: prior to gecko 10.0 (firefox 10.0 / thunderbird 10.0 / seamonkey 2.7), this attribute was part of nsidocumentviewer. [noscript,notxpcom,nostdcall] nsiviewptr findcontainerview(); parameters none. return value the container view, or null if this content viewer is the root of a view manager hierarchy. note: if this container is the root of a view manager hierarchy (that is, this method returns null), and mparentwidget is also null, then this document should not even be displayed. native code only!getbounds void getbounds( in nsintrectref abounds ); parameters abounds missing descript...
...hide() void hide(); parameters none. ...
...And 5 more matches

nsIDBFolderInfo
rtorder nsmsgviewsortordervalue sorttype nsmsgviewsorttypevalue version unsigned long viewflags nsmsgviewflagstypevalue viewtype nsmsgviewtypevalue methods andflags() long andflags( in long flags ); parameters flags missing description return value missing description exceptions thrown missing exception missing description changeexpungedbytes() void changeexpungedbytes( in long delta ); parameters delta missing description exceptions thrown missing exception missing description changenummessages() void changenummessages( in long delta ); parameters delta missing desc...
...messages() void changenumunreadmessages( in long delta ); parameters delta missing description exceptions thrown missing exception missing description getbooleanproperty() boolean getbooleanproperty( in string propertyname, in boolean defaultvalue ); parameters propertyname missing description defaultvalue missing description return value missing description exceptions thrown missing exception missing description getcharacterset() void getcharacterset( out acstring charset, out boolean overriden ); parameters charset missing description overriden missing description exceptions thrown missing exception missing description getcharactersetoverride() ...
...charactersetoverride() obsolete since gecko 1.8 (firefox 1.5 / thunderbird 1.5 / seamonkey 1.0) void getcharactersetoverride( out boolean charactersetoverride ); parameters charactersetoverride missing description exceptions thrown missing exception missing description getcharptrcharacterset() string getcharptrcharacterset(); parameters none. ...
...And 5 more matches

nsIDOMNSHTMLDocument
read only. designmode domstring set to "on" or "off" to enable or disable editing for the entire document at once. roughly equivalent to body.contenteditable domain domstring initially the host name of the document's url, but may be changed t...
... initially the host name of the document's url, but may be changed to the parent (but not top-level) domain in order to facilitate data exchange between documents from different sites in the same domain. embeds nsidomhtmlcollection equivalent to getelementsbytagname("embed") read only. fgcolor domstring same as body.text head nsidomhtmlheadelement returns the first child element of the html element that is a head element, or null if there is no html or head element. read only. height long the height of the body element. read only. obsolete since gecko 6.0 linkcolor domstring same as body.link plugins nsidomhtmlcollection same as embeds for compatibility with netscape 4.x read only. vlinkcolor...
...) boolean execcommand( in domstring commandid, in boolean doshowui, in domstring value ); parameters commandid the name of the command to execute. see rich-text editing in mozilla for a list of supported commands. doshowui this is not implemented in gecko. value some commands require an argument. you can pass null for those commands that do not need an argument. return value true if the command was recognized, false otherwise. execcommandshowhelp() obsolete since gecko 14.0 (firefox 14.0 / thunderbird 14.0 / seamonkey 2.11) this method never did anything but throw an exception, and was removed entirely in gecko 14.0 (firefox 14.0 / thunderbird 14.0 / seamonkey 2.11). boolean execcommandshowhelp( in domstring commandid ); parameters ...
...And 5 more matches

nsIFaviconService
rown ns_error_not_available thrown when we have never heard of this favicon url. getfavicondataasdataurl() obsolete since gecko 22.0 (firefox 22.0 / thunderbird 22.0 / seamonkey 2.19) note: this method was removed in gecko 22.0. you should use the new async api moziasyncfavicons.getfavicondataforpage() instead. this method retrieves the given favicon data, returning it as a data url throws an exception if we don't have data. if there is no data but we have an entry for this favicon, returns null. astring getfavicondataasdataurl( in nsiuri afaviconuri ); parameters afaviconuri uri of the favicon whose data is being read. return value a data url containing the data for the favicon. this is null if there is no data but there is an entry for the ...
...e since gecko 22.0 (firefox 22.0 / thunderbird 22.0 / seamonkey 2.19) note: this method was removed in gecko 22.0. you should use the new async api moziasyncfavicons.getfaviconurlforpage() instead. this method retrieves the uri of the favicon for the given page. nsiuri getfaviconforpage( in nsiuri apageuri ); parameters apageuri uri of the page whose favicon is desired. return value returns the uri of the favicon associated with that page. returning a uri here does not mean that we have data for this favicon, only that we know what the favicon should be. exceptions thrown ns_error_not_available when the page is not found or it has no favicon. getfaviconimageforpage() obsolete since gecko 22.0 (firefox 22.0 / thunderbird 22.0 / seamonkey 2.19)...
...ou should use the new async api moziasyncfavicons.getfaviconurlforpage() and getfaviconlinkforicon() instead. this method is very similar to that of getfaviconlinkforicon() method. for a given page will give you a uri that, when displayed in chrome, will result in the given page's favicon. unlike the other get functions, we needn't have heard of the page or its favicon: the default one will be returned in this case. when compared to getfaviconlinkforicon() method, this method only adds the extra level of indirection, looking up the favicon based on the page uri and using the default if not found. nsiuri getfaviconimageforpage( in nsiuri apageuri ); parameters apageuri uri of the page whose favicon is desired. return value returns a uri that will give you the icon image. this is n...
...And 5 more matches

nsIHttpServer
(not supported) * @param function callback optional callback */ listen: function(port, opt, callback) { if (arguments.length == 2 && "function" == typeof opt) { ...
...(not supported) * @param function callback optional callback */ listen: function(port, opt, callback) { if (arguments.length == 2 && "function" == typeof opt) { callback = opt; ...
... this.registerprefixhandler("/", callback); } let host = "localhost"; if (typeof port === "string" && port.indexof(':') != -1){ [host, port] = port.split(':'); port = parseint(port); server.identity.add('http', host, port); } server.wrappedjsobject._start(port, host); return true; }, registerfile: function(path, filepath) { var file = components.classes['@mozilla.org/file/local;1'] .createinstance(components.interfaces.nsilocalfile); file.initwithpath(filepath); return server.registerfile(path, file); }, registerdirectory : function(path, directorypath) { var...
...And 5 more matches

nsIOutputStream
the stream. forces the output stream to flush() any buffered data. note: this method may be called more than once, but subsequent calls are ignored. void close(); parameters none. exceptions thrown ns_base_stream_would_block indicates that closing the output stream would block the calling thread for an indeterminate amount of time. this exception may only be thrown if isnonblocking() returns true. flush() this method may be called to instruct the output stream to write out the contents of any internal buffers to a low-level data sink, such as a file on disk. however, the flush method may simply do nothing depending on the implementation of the output stream. void flush(); parameters none. exceptions thrown ns_base_stream_would_block indicates that flushing the output str...
... a low-level data sink, such as a file on disk. however, the flush method may simply do nothing depending on the implementation of the output stream. void flush(); parameters none. exceptions thrown ns_base_stream_would_block indicates that flushing the output stream would block the calling thread for an indeterminate amount of time. this exception may only be thrown if isnonblocking() returns true. isnonblocking() note: writing to a blocking output stream will block the calling thread until all given data can be consumed by the stream. note: a non-blocking output stream may implement nsiasyncoutputstream to provide consumers with a way to wait for the stream to accept more data once its write() method is unable to accept any data without blocking. boolean isnonblocking(); para...
...ocking() note: writing to a blocking output stream will block the calling thread until all given data can be consumed by the stream. note: a non-blocking output stream may implement nsiasyncoutputstream to provide consumers with a way to wait for the stream to accept more data once its write() method is unable to accept any data without blocking. boolean isnonblocking(); parameters none. return value true if stream is non-blocking. exceptions thrown ns_base_stream_would_block a non-blocking stream may throw this exception when written to if space for the data is not immediately available. write() this method copies data from a buffer into the stream. note: though this method is scriptable, javascript code must only pass an ascii character string as the abuf parameter. c++ code...
...And 5 more matches

nsIPropertyBag2
note: acc...
...ng prop, in nsiidref iid, [iid_is(iid), retval] out nsqiresult result); pruint32 getpropertyasuint32(in astring prop); pruint64 getpropertyasuint64(in astring prop); prbool haskey(in astring prop); methods get() this method returns null if the value does not exist, or exists but is null. nsivariant get( in astring prop ); parameters prop property to return the value of. return value the property value as an nsivariant. getpropertyasacstring() acstring getpropertyasacstring( in astring prop ); parameters prop property to return the value of. return value the property value as an acstring. note: accessing a property of a different type may attempt conversion to this type. getpropertyasastring() astring getpropertyasastring( in astring...
...s an nsivariant. getpropertyasacstring() acstring getpropertyasacstring( in astring prop ); parameters prop property to return the value of. return value the property value as an acstring. note: accessing a property of a different type may attempt conversion to this type. getpropertyasastring() astring getpropertyasastring( in astring prop ); parameters prop property to return the value of. return value the property value as a string. note: accessing a property of a different type may attempt conversion to this type. getpropertyasautf8string() autf8string getpropertyasautf8string( in astring prop ); parameters prop property to return the value of. return value the property value as an autf8string. note: accessing a property of a different type may attempt...
...And 5 more matches

nsISelectionPrivate
ring formattype, in unsigned long flags, in print32 wrapcolumn); attributes attribute type description cancacheframeoffset boolean frame offset cache can be used just during calling nseditor::endplaceholdertransaction. endplaceholdertransaction will give rise to reflow/refreshing view/scroll, and call times of nstextframe::getpointfromoffset whose return value is to be cached. see bug 35296 and bug 199412 native code only! interlineposition boolean type short returns the type of the selection (see nsiselectioncontroller for available constants). read only. constants constant value description endofprecedingline 0 startofnextline 1 tableselection...
...bleselection_table 4 tableselection_allcells 5 methods addselectionlistener() void addselectionlistener( in nsiselectionlistener newlistener ); parameters newlistener endbatchchanges() will resume user interface updates after a previous call to startbatchchanges(). void endbatchchanges(); parameters none. ...
...vious call to startbatchchanges(). void endbatchchanges(); parameters none. native code only!getcachedframeoffset returns cached value for nstextframe::getpointfromoffset. void getcachedframeoffset( in nsiframe aframe, in print32 inoffset, in nspointref apoint ); parameters aframe inoffset apoint getenumerator() nsienumerator getenumerator(); parameters none. return value native code only!getframeselection nsframeselection getframeselection(); parameters none. return value a reference to the frame selection associated with this selection. getrangesforinterval() return array of ranges intersecting with the given dom interval. void getrangesforinterval( in nsidomnode beginnode, in print32 beginoffset, in nsidomnode endnode, in print32 end...
...And 5 more matches

nsITransferable
ce the destination directory for a file drag is known. methods adddataflavor() adds a new data flavor, indicating that this transferable can receive the type of data represented by the specified flavor string. void adddataflavor( in string adataflavor ); parameters adataflavor a string defining a new data flavor that the transferable supports. ...
...dataflavor( in string adataflavor ); parameters adataflavor a string defining a new data flavor that the transferable supports. flavorstransferablecanexport() returns a list of flavors (mime types as nsisupportscstring) that the transferable can export, either through intrinsic knowledge or output data converters. nsisupportsarray flavorstransferablecanexport(); parameters none. return value missing description flavorstransferablecanimport() computes a list of flavors (mime types as nsisupportscstring) that the transferable can accept into it, either through intrinsic knowledge or input data converters. ...
...output data converters. nsisupportsarray flavorstransferablecanexport(); parameters none. return value missing description flavorstransferablecanimport() computes a list of flavors (mime types as nsisupportscstring) that the transferable can accept into it, either through intrinsic knowledge or input data converters. nsisupportsarray flavorstransferablecanimport(); parameters none. return value missing description getanytransferdata() returns the best flavor in the transferable, given those that have been added to it with adddataflavor(). ...
...And 5 more matches

nsIURL
or something to be a definitely be a file. but you can get just the leading directory portion for sure. some characters may be escaped. filebasename autf8string file basename portion of a filename in a url. some characters may be escaped. fileextension autf8string file extension portion of a filename in a url. if a file extension does not exist, the empty string is returned. some characters may be escaped. filename autf8string file name portion of a url. if the url denotes a path to a directory and not a file, for example http://host/foo/bar/, then the directory attribute accesses the complete /foo/bar/ portion, and the filename is the empty string. note that this is purely based on searching for the last trailing slash. and hence don't rely on this...
... ; in the url. some characters may be escaped. obsolete since gecko 9.0 note: this was removed in gecko 9.0 (firefox 9.0 / thunderbird 9.0 / seamonkey 2.6) because the semicolon is not actually valid for this purpose and should not have been specially handled. query autf8string query portion (the part after the "?") of the url. if there isn't one, an empty string is returned. some characters may be escaped. ref autf8string reference portion (the part after the "#") of the url. if there isn't one, an empty string is returned. some characters may be escaped. methods getcommonbasespec() this method takes a uri and compares the two. the common uri portion is returned as a string. the minimum common uri portion is the protocol, and any of these if p...
...for file uris, it is expected that the common spec would be at least "file:///" since '/' is a shared common root. ...
...And 5 more matches

nsIAbCard/Thunderbird3
ismaillist boolean if ismaillist is true then maillisturi will contain the uri of the associated mail list. this will be removed from the interface at a later date. maillisturi string if ismaillist is true then maillisturi will contain the uri of the associated mail list. this will be removed from the interface at a later date. methods getproperty() returns a property for the given name. nsivariant getproperty(in autf8string name, in nsivariant defaultvalue); parameters name the case-sensitive name of the property to get. defaultvalue the value to return if the property does not exist. return value the value of the attribute asked for. exceptions thrown ns_error_not_available<tt> if the named property does not exist. <tt>ns_er...
...ta if the property cannot be converted to the desired type. getpropertyasastring() getpropertyasautf8string() getpropertyasuint32() getpropertyasbool() [noscript] astring getpropertyasastring(in string name); [noscript] autf8string getpropertyasautf8string(in string name); [noscript] pruint32 getpropertyasuint32(in string name); [noscript] boolean getpropertyasbool(in string name); returns a property for the given name. these functions convert values in the same manner as the default implementation of nsivariant. of particular note is that boolean variables are converted to integers as in c/c++ (true is a non-zero value), so that false will be converted to a string of 0 and not false<code>. these functions are marked <code>[noscript] since xpcconnect performs automatic type conv...
...ean variables are converted to integers as in c/c++ (true is a non-zero value), so that false will be converted to a string of 0 and not false<code>. these functions are marked <code>[noscript] since xpcconnect performs automatic type conversion on nsivariant such that they are not needed for scripts, only for c++ callers. parameters name the case-sensitive name of the property to get. return value the value of the attribute asked for. exceptions thrown ns_error_not_available<tt> if the named property does not exist. <tt>ns_error_cannot_convert_data if the property cannot be converted to the desired type. [noscript] astring getpropertyasastring(in string name); [noscript] autf8string getpropertyasautf8string(in string name); [noscript] pruint32 getpropertyasuint32(in s...
...And 5 more matches

Address Book examples
"] .getservice(components.interfaces.nsiabmanager); let oneaddressbook = abmanager.getdirectory(addressbookuri); how do i search for a particular contact property (name, email)? once you have an object that implements nsiabcollection (see above), you can search for cards with particular properties within that collection using getcardfromproperty. ...
... let collection = ... let card = collection.cardforemailaddress("foo@bar.invalid.com"); note: both of these functions may raise an ns_error_not_implemented exception if the collection has not implemented that function. this is currently true in the case of ldap, but may be true in other cases as well. ...
...database specific information, that is used on edits. editing contacts once you have obtained a card from an nsiabdirectory (see above), you can edit it in a two step process, firstly, change the properties that you to edit: card.setproperty("firstname", "jane"); card.setproperty("lastname", "doe"); seco...
...And 5 more matches

Declaring and Using Callbacks
. warning: callbacks must be invoked on the same thread with which they were registered. there is no concurrency logic in js-ctypes, so invoking callbacks on other threads will cause things to crash. prerequiste understanding abi functiontype declaring callbacks a callback is declared by using ctypes.functiontype. the first argument is the calling convention, the second argument is the return type, and the third is an array of arguments the callback expects. the return type of the javascript callback must match the return type declared, otherwise js-ctypes will throw an error saying "unexpected return type". examples example 1 this callback that returns bool and has two arguments. var myfunctypedeclaration = ctypes.functiontype(ctypes.default_abi, ctypes.bool, [ctypes.int, ctypes...
...k expects. the return type of the javascript callback must match the return type declared, otherwise js-ctypes will throw an error saying "unexpected return type". examples example 1 this callback that returns bool and has two arguments. var myfunctypedeclaration = ctypes.functiontype(ctypes.default_abi, ctypes.bool, [ctypes.int, ctypes.voidptr_t]); function myjscallback(cint, cptr) { return true; // as the return of the functiontype was ctypes.bool we must make our javascript callback return bool otherwise js-ctypes will throw error saying unexpected type return } var myccallback = myfunctypedeclaration.ptr(myjscallback); example 2 this callback that returns void and no arguments. ...
...[ctypes.int, ctypes.voidptr_t]); function myjscallback(cint, cptr) { return true; // as the return of the functiontype was ctypes.bool we must make our javascript callback return bool otherwise js-ctypes will throw error saying unexpected type return } var myccallback = myfunctypedeclaration.ptr(myjscallback); example 2 this callback that returns void and no arguments. when void is the return type, the javascript callback must not return, or it should return undefined. ...
...And 5 more matches

Standard OS Libraries
ows apis can be found at the msdn api index. winapi this is the one that is most commonly used by js-ctypes. this comes shipped by default with all installations of windows operating systems since win98. it's also known as winapi32 or just winapi. a list of all the functions available through this api can be found at the msdn winapi index. for finding out the values and types of arguments and returns of the functions you want to use from this api, you must visit the functions page on this linked msdn site; it will give you all that information. example: getcursorpos i wanted to get the mouse cursor position without using a mousemove listener, as this is a high overhead event listener. so i went to the msdn winapi index page and then went to the "cursors" category and came across getcursorp...
.../ types var gint = ctypes.int; var gdkdevice = ctypes.structtype('gdkdevice'); var gdkmodifiertype = ctypes.int; var gdkwindow = ctypes.structtype('gdkwindow'); var void = ctypes.void_t; // https://developer.gnome.org/gdk3/stable/gdk3-windows.html#gdk-get-default-root-window var gdk_get_default_root_window = gdk.declare('gdk_get_default_root_window', ctypes.default_abi, gdkwindow.ptr // return - the root window, which is top most parent of all windows ); // in gdk2 we have to use gdk_window_get_pointer, but in gdk3 it was deprecated and have to use gdk_window_get_device_position https://developer.gnome.org/gdk3/stable/gdk3-windows.html#gdk-window-get-pointer var gdk_window_get_pointer = gdk.declare('gdk_window_get_pointer', ctypes.default_abi, gdkwindow.ptr, // return - the...
...devicemanager = ctypes.structtype('gdkdevicemanager'); var gdkdisplay = ctypes.structtype('gdkdisplay'); var gdkmodifiertype = ctypes.int; var gdkwindow = ctypes.structtype('gdkwindow'); // https://developer.gnome.org/gdk3/stable/gdk3-windows.html#gdk-get-default-root-window var gdk_get_default_root_window = gdk.declare('gdk_get_default_root_window', ctypes.default_abi, gdkwindow.ptr // return - the root window, which is top most parent of all windows ); // in gdk2 we have to use gdk_window_get_pointer, but in gdk3 it was deprecated and have to use gdk_window_get_device_position // https://developer.gnome.org/gdk3/stable/gdk3-windows.html#gdk-window-get-device-position var gdk_window_get_device_position = gdk3.declare('gdk_window_get_device_position', ctypes.default_abi, gdkwindow...
...And 5 more matches

CData
n constructor ctype the data type of the cdata object, as a ctype. read only. note: this is never ctypes.void_t or an array type with an unspecified length. value object the javascript equivalent of the cdata object's value. this will throw a typeerror exception if the value can't be converted. ...
...eerror exception if the value can't be converted. methods available on all cdata objects address() returns a cdata object of the pointer type ctypes.pointertype(dataobject.constructor) whose value points to the c object referred to by the object. this provides a way to get a pointer to the actual data of the c value represented by the cdata object. cdata address() parameters none. return value a cdata object of the pointer type ctypes.pointertype(dataobject.constructor) whose value points to the c object referred to by the object. ...
...pe(dataobject.constructor) whose value points to the c object referred to by the object. this provides a way to get a pointer to the actual data of the c value represented by the cdata object. cdata address() parameters none. return value a cdata object of the pointer type ctypes.pointertype(dataobject.constructor) whose value points to the c object referred to by the object. tosource() returns the string "t(arg)", where t and arg are implementation-defined javascript expressions intended to represent the type of the cdata object and its value, respectively. string tosource() parameters none. return value a string that, ideally, should be able to be evaluated to produce a new cdata object containing a copy of the original object. however, this only works if the object's type happ...
...And 5 more matches

All keyboard shortcuts - Firefox Developer Tools
ve to first node in the tree. home home home move to last node in the tree. end end end expand currently selected node right arrow right arrow right arrow collapse currently selected node left arrow left arrow left arrow (when a node is selected) move inside the node so you can start stepping through attributes. ...
...eft arrow (when a node is selected) move inside the node so you can start stepping through attributes. ...
...ributes of a node shift + tab shift + tab shift + tab (when an attribute is selected) start editing the attribute enter return enter hide/show the selected node h h h focus on the search box in the html pane ctrl + f cmd + f ctrl + f edit as html f2 f2 f2 stop editing html f2 / ctrl +enter f2 / cmd + return f2 / ctrl + enter copy the selected node's outer html ctrl + c cmd + c ctrl + c scroll the selected node into view s s s find the next match in the markup, when searching is active enter return enter find the previous match in the markup, when searching is active shift + enter shift + return shift + enter breadcrumb...
...And 5 more matches

Attr - Web APIs
the attr interface represents one of a dom element's attributes as an object. in most dom methods, you will directly retrieve the attribute as a string (e.g., element.getattribute()), but certain functions (e.g., element.getattributenode()) or means of iterating return attr types. <div id="interfacediagram" style="display: inline-block; position: relative; width: 100%; padding-bottom: 11.666666666666666%; vertical-align: middle; overflow: hidden;"><svg style="display: inline-block; position: absolute; top: 0; left: 0;" viewbox="-50 0 600 70" preserveaspectratio="xminymin meet"><a xlink:href="/docs/web/api/eventtarget" target="_top"><rect x="1" y="1" width="110" height="50" fill="#fff" stroke="#d4dde4" stroke-width="2px" /><text x="56" y="30" font-size="12px" font-family="consolas,monaco...
...read only a domstring representing the namespace prefix of the attribute, or null if no prefix is specified. ownerelement read only the element holding the attribute. note: dom level 4 removed this property. the assumption was that since you get an attr object from an element, you should already know the associated element. ...
... value the attribute's value. note: dom level 3 defined namespaceuri, localname and prefix on the node interface. ...
...And 5 more matches

CSS Typed Object Model API - Web APIs
of the the css typed object model api is the base class of all css values accessible through the typed om api. an instance of this class may be used anywhere a string is expected. cssstylevalue.parse(property, csstext) the parse() method of the cssstylevalue interface allows a cssnumericvalue to be constructed from a css string. it sets a specific css property to the specified values and returns the first value as a cssstylevalue object. cssstylevalue.parseall() the parseall() method of the cssstylevalue interface sets all occurences of a specific css property to the specified valueand returns an array of cssstylevalue objects, each containing one of the supplied values. stylepropertymap the stylepropertymap interface of the the css typed object model api provides a representation...
...arsedvalue the cssunparsedvalue interface of the css typed object model api represents property values that reference custom properties. it consists of a list of string fragments and variable references. cssunparsedvalue.cssunparsedvalue() constructor creates a new cssunparsedvalue object which represents property values that reference custom properties. ...
... csskeywordvalue serialization the csskeywordvalue interface of the the css typed object model api creates an object to represent css keywords and other identifiers. ...
...And 5 more matches

DOMMatrix - Web APIs
the dommatrix interface represents 4×4 matrices, suitable for 2d and 3d operations including rotation and translation. it is a mutable version of the dommatrixreadonly interface. this interface should be available inside web workers, though some implementations don't allow it yet. constructor dommatrix() creates and returns a new dommatrix object. properties this interface inherits properties from dommatrixreadonly, though some of these properties are altered to be mutable. is2d read only a boolean flag whose value is true if the matrix was initialized as a 2d matrix. if false, the matrix is 3d. isidentity read only a boolean whose value is true if the matrix is the identity matrix. the identity matrix is one in which every value is 0 except those on the main diagonal from t...
... a m11 b m12 c m21 d m22 e m41 f m42 methods this interface includes the following methods, as well as the methods it inherits from dommatrixreadonly. dommatrix.invertself() modifies the matrix by inverting it. if the matrix can't be inverted, its components are all set to nan, and is2d returns false. dommatrix.multiplyself() modifies the matrix by post-multiplying it with the specified dommatrix. this is equivalent to the dot product a⋅b, where matrix a is the source matrix and b is the matrix given as an input to the method. returns itself. dommatrix.premultiplyself() modifies the matrix by pre-multiplying it with the specified dommatrix. this is equivalent to the dot product b...
... dommatrix. this is equivalent to the dot product a⋅b, where matrix a is the source matrix and b is the matrix given as an input to the method. returns itself. dommatrix.premultiplyself() modifies the matrix by pre-multiplying it with the specified dommatrix. this is equivalent to the dot product b⋅a, where matrix a is the source matrix and b is the matrix given as an input to the method. returns itself. dommatrix.translateself() modifies the matrix by applying the specified vector. the default vector is [0, 0, 0]. returns itself. dommatrix.scalenonuniformself() modifies the matrix by applying the specified scaling on the x, y, and z axes, centered at the given origin. by default, the y and z axes' scaling factors are both 1, but the scaling factor for x must be specified. the defa...
...And 5 more matches

Headers - Web APIs
rs.entries()). note: you can find more out about the available headers by reading our http headers reference. constructor headers() creates a new headers object. methods headers.append() appends a new value onto an existing header inside a headers object, or adds the header if it does not already exist. headers.delete() deletes a header from a headers object. ...
...headers.append() appends a new value onto an existing header inside a headers object, or adds the header if it does not already exist. headers.delete() deletes a header from a headers object. headers.entries() returns an iterator allowing to go through all key/value pairs contained in this object. headers.foreach() executes a provided function once for each array element. headers.get() returns a bytestring sequence of all the values of a header within a headers object with a given name. headers.has() returns a boolean stating whether a headers object contains a certain header. headers.keys() returns an iterator allowing you to go through all keys of the key/value pairs contained in this object. headers.set() sets a new value for an existing header inside a headers object, or add...
...eaders object with a given name. headers.has() returns a boolean stating whether a headers object contains a certain header. headers.keys() returns an iterator allowing you to go through all keys of the key/value pairs contained in this object. headers.set() sets a new value for an existing header inside a headers object, or adds the header if it does not already exist. headers.values() returns an iterator allowing you to go through all values of the key/value pairs contained in this object. note: to be clear, the difference between headers.set() and headers.append() is that if the specified header does already exist and does accept multiple values, headers.set() will overwrite the existing value with the new one, whereas headers.append() will append the new value onto the end of th...
...And 5 more matches

IDBIndex - Web APIs
x can point to only one record in its referenced object store, but several indexes can reference the same object store. when the object store changes, all indexes that refers to the object store are automatically updated. you can grab a set of keys within a range. to learn more, see idbkeyrange. note: this feature is available in web workers. properties idbindex.isautolocale read only returns a boolean indicating whether the index had a locale value of auto specified upon its creation (see createindex()'s optionalparameters.) idbindex.locale read only returns the locale of the index (for example en-us, or pl) if it had a locale value specified upon its creation (see createindex()'s optionalparameters.) idbindex.name the name of this index. idbindex.objectstore read only the...
...nly affects how the index behaves when the result of evaluating the index's key path yields an array. if true, there is one record in the index for each item in an array of keys. if false, then there is one record for each key that is an array. idbindex.unique read only if true, this index does not allow duplicate values for a key. ...
...valuating the index's key path yields an array. if true, there is one record in the index for each item in an array of keys. if false, then there is one record for each key that is an array. idbindex.unique read only if true, this index does not allow duplicate values for a key. methods inherits from: eventtarget idbindex.count() returns an idbrequest object, and in a separate thread, returns the number of records within a key range. ...
...And 5 more matches

IDBObjectStore - Web APIs
ect store. if this attribute is null, the application must provide a key for each modification operation. idbobjectstore.name the name of this object store. idbobjectstore.transaction read only the idbtransaction object to which this object store belongs. idbobjectstore.autoincrement read only the value of the auto increment flag for this object store. methods idbobjectstore.add() returns an idbrequest object, and, in a separate thread, creates a structured clone of the value, and stores the cloned value in the object store. this is for adding new records to an object store. idbobjectstore.clear() creates and immediately returns an idbrequest object, and clears this object store in a separate thread. this is for deleting all current records out of an object store. idbobjectsto...
...t object, and, in a separate thread, creates a structured clone of the value, and stores the cloned value in the object store. this is for adding new records to an object store. idbobjectstore.clear() creates and immediately returns an idbrequest object, and clears this object store in a separate thread. this is for deleting all current records out of an object store. idbobjectstore.count() returns an idbrequest object, and, in a separate thread, returns the total number of records that match the provided key or idbkeyrange. ...
... store. idbobjectstore.clear() creates and immediately returns an idbrequest object, and clears this object store in a separate thread. this is for deleting all current records out of an object store. idbobjectstore.count() returns an idbrequest object, and, in a separate thread, returns the total number of records that match the provided key or idbkeyrange. if no arguments are provided, it returns the total number of records in the store. idbobjectstore.createindex() creates a new index during a version upgrade, returning a new idbindex object in the connected database. idbobjectstore.delete() returns an idbrequest object, and, in a separate thread, deletes the store object selected by the specified key. this is for deleting individual records out of an object store. idbobjectstore.d...
...And 5 more matches

Recording a media element - Web APIs
in this article, we'll look at an example that does just that. html content <p>click the "start" button to begin video recording for a few seconds. you can stop the video by clicking the creatively-named "stop" button. ...
...); this specifies the length of the videos we'll record. utility functions next, we create some utility functions that will get used later. function log(msg) { logelement.innerhtml += msg + "\n"; } the log() function is used to output text strings to a <div> so we can share information with the user. not very pretty but it gets the job done for our purposes. function wait(delayinms) { return new promise(resolve => settimeout(resolve, delayinms)); } the wait() function returns a new promise which resolves once the specified number of milliseconds have elapsed. it works by using an arrow function which calls window.settimeout(), specifying the promise's resolution handler as the timeout handler function. that lets us use promise syntax when using timeouts, which can be very handy whe...
...we always record no more than the specified number of milliseconds of media, although if the media stops before that time is reached, mediarecorder automatically stops recording as well. line 2 ...
...And 5 more matches

TreeWalker - Web APIs
the treewalker object represents the nodes of a document subtree and a position within them. a treewalker can be created using the document.createtreewalker() method. properties this interface doesn't inherit any property. treewalker.root read only returns a node representing the root node as specified when the treewalker was created. treewalker.whattoshow read only returns an unsigned long being a bitmask made of constants describing the types of node that must be presented. non-matching nodes are skipped, but their children may be included, if relevant. the possible values are: constant numerical value description nodefilter.show_all -1 (that is the max value of unsigned long) shows all nodes. nodefilter.show_a...
...ase, it means that the notation node will appear in the first position of the traversal. since entities are not part of the document tree, they do not appear when traversing over the document tree. nodefilter.show_processing_instruction 64 shows processinginstruction nodes. nodefilter.show_text 4 shows text nodes. treewalker.filter read only returns a nodefilter used to select the relevant nodes. treewalker.expandentityreferences read only is a boolean indicating, when discarding an entityreference its whole sub-tree must be discarded at the same time. treewalker.currentnode is the node on which the treewalker is currently pointing at. methods this interface doesn't inherit any method. note: in the context of a treewalker, a node...
...ointing at. methods this interface doesn't inherit any method. note: in the context of a treewalker, a node is visible if it exists in the logical view determined by the whattoshow and filter parameter arguments. (whether or not the node is visible on the screen is irrelevant.) treewalker.parentnode() moves the current node to the first visible ancestor node in the document order, and returns the found node. it also moves the current node to this one. if no such node exists, or if it is before that the root node defined at the object construction, returns null and the current node is not changed. treewalker.firstchild() moves the current node to the first visible child of the current node, and returns the found child. it also moves the current node to this child. if no such child e...
...And 5 more matches

A basic 2D WebGL animation example - Web APIs
en the final position is computed by multiplying the rotated position by the scaling vector provided by the javascript code in uscalingfactor. the values of z and w are fixed at 0.0 and 1.0, respectively, since we're drawing in 2d. the standard webgl global gl_position is then set to the transformed and rotated vertex's position. fragment shader next comes the fragment shader. its role is to return the color of each pixel in the shape being rendered. since we're drawing a solid, untextured object with no lighting applied, this is exceptionally simple: <script id="fragment-shader" type="x-shader/x-fragment"> #ifdef gl_es precision highp float; #endif uniform vec4 uglobalcolor; void main() { gl_fragcolor = uglobalcolor; } </script> this starts by specifying the precision...
...ed to let us add multiple shaders to our program quite easily. the array shaderset contains a list of objects, each describing one shader function to be compiled into the program. each function has a type (one of gl.vertex_shader or gl.fragment_shader) and an id (the id of the <script> element containing the shader's code). the shader set is passed into the function buildshaderprogram(), which returns the compiled and linked shader program. we'll look at how this works next. once the shader program is built, we compute the aspect ratio of our context by dividing its width by its height. then we set the current rotation vector for the animation to [0, 1], and the scaling vector to [1.0, aspectratio]. the scaling vector, as we saw in the vertex shader, is used to scale the coordinates to fit ...
...typically 60 fps) is set to 6. finally, animatescene() is called to render the first frame and schedule the rendering of the next frame of the animation. compiling and linking the shader program constructing and linking the program the buildshaderprogram() function accepts as input an array of objects describing a set of shader functions to be compiled and linked into the shader program and returns the shader program after it's been built and linked. function buildshaderprogram(shaderinfo) { let program = gl.createprogram(); shaderinfo.foreach(function(desc) { let shader = compileshader(desc.id, desc.type); if (shader) { gl.attachshader(program, shader); } }); gl.linkprogram(program) if (!gl.getprogramparameter(program, gl.link_status)) { console.log("e...
...And 5 more matches

Adding 2D content to a WebGL context - Web APIs
o transform the input vertex from its original coordinate system into the clip space coordinate system used by webgl, in which each axis has a range from -1.0 to 1.0, regardless of aspect ratio, actual size, or any other factors. the vertex shader must perform the needed transforms on the vertex's position, make any other adjustments or calculations it needs to make on a per-vertex basis, then return the transformed vertex by saving it in a special variable provided by glsl, called gl_position. the vertex shader can, as needed, also do things like determine the coordinates within the face's texture of the texel to apply to the vertex, apply the normals to determine the lighting factor to apply to the vertex, and so on. this information can then be stored in varyings or attributes as appropri...
...the fragment shader is called once for every pixel on each shape to be drawn, after the shape's vertices have been processed by the vertex shader. its job is to determine the color of that pixel by figuring out which texel (that is, the pixel from within the shape's texture) to apply to the pixel, getting that texel's color, then applying the appropriate lighting to the color. the color is then returned to the webgl layer by storing it in the special variable gl_fragcolor. that color is then drawn to the screen in the correct position for the shape's corresponding pixel. in this case, we're simply returning white every time, since we're just drawing a white square, with no lighting in use. const fssource = ` void main() { gl_fragcolor = vec4(1.0, 1.0, 1.0, 1.0); } `; init...
...// function loadshader(gl, type, source) { const shader = gl.createshader(type); // send the source to the shader object gl.shadersource(shader, source); // compile the shader program gl.compileshader(shader); // see if it compiled successfully if (!gl.getshad...
...And 5 more matches

WebGL best practices - Web APIs
page tackles recommendations across the spectrum of expertise, and not only highlights dos and don'ts, but also details why. you can rely on this document to guide your choice of approach, and ensure you're on the right track no matter what browser or hardware your users run. general topics address and eliminate webgl errors your application should run without generating any webgl errors (as returned by geterror). every webgl error is reported in the web console as a javascript warning with a descriptive message. after too many errors (32 in firefox), webgl stops generating descriptive messages, which really hinders debugging. the only errors a well-formed page generates are out_of_memory and context_lost. know your limits (and extensions) the availability of most webgl extensions depend...
... in the rendered output. however, lod meshes is usually the answer to this problem, rarely moving work from the vertex to the fragment shader. compile shaders and link programs in parallel it's tempting to compile shaders and link programs serially, but many browsers can compile and link in parallel on background threads. ...
...ams) { compileonce(gl, vs); compileonce(gl, fs); gl.linkprogram(prog); if (!gl.getprogramparameter(prog, gl.link_status)) { console.error('link failed: ' + gl.getprograminfolog(prog)); console.error('vs info-log: ' + gl.getshaderinfolog(vs)); console.error('fs info-log: ' + gl.getshaderinfolog(fs)); } } consider: function compileonce(gl, shader) { if (shader.compiled) return; gl.compileshader(shader); shader.compiled = true; } for (const [vs, fs, prog] of programs) { compileonce(gl, vs); compileonce(gl, fs); } for (const [vs, fs, prog] of programs) { gl.linkprogram(prog); } for (const [vs, fs, prog] of programs) { if (!gl.getprogramparameter(prog, gl.link_status)) { console.error('link failed: ' + gl.getprograminfolog(prog)); console.error('vs inf...
...And 5 more matches

WebGL model view projection - Web APIs
bute vec3 position; void main() { // the gl_position is the final position in clip space after the vertex shader modifies it gl_position = vec4(position, 1.0); } next, to actually rasterize the data into pixels, the fragment shader evaluates everything on a per pixel basis, setting a single color. the gpu calls the shader function for each pixel it needs to render; the shader's job is to return the color to use for that pixel. precision mediump float; uniform vec4 color; void main() { gl_fragcolor = color; } with those settings included, it's time to directly draw to the screen using clip space coordinates. var box = new webglbox(); first draw a red box in the middle. box.draw({ top : 0.5, // x bottom : -0.5, // x left : -0.5, // y ...
...ribute to the shader. this is a three dimensional point, but the gl_position variable that ends up getting passed down through the pipeline is actually 4 dimensional — instead of (x, y, z) it is (x, y, z, w). there is no letter after z, so by convention this fourth dimension is labeled w. in the above example the w coordinate is set to 1.0. the obvious question is "why the extra dimension?" it turns out that this addition allows for lots of nice techniques for manipulating 3d data. this added dimension introduces the notion of perspective into the coordinate system; with it in place, we can map 3d coordinates into 2d space—thereby allowing two parallel lines to intersect as they recede into the distance. the value of w is used as a divisor for the other components of the coordinate, so th...
...nsional point is defined in a typical cartesian coordinate system. the added fourth dimension changes this point into a homogeneous coordinate. it still represents a point in 3d space and it can easily be demonstrated how to construct this type of coordinate through a pair of simple functions. function cartesiantohomogeneous(point) let x = point[0]; let y = point[1]; let z = point[2]; return [x, y, z, 1]; } function homogeneoustocartesian(point) { let x = point[0]; let y = point[1]; let z = point[2]; let w = point[3]; return [x/w, y/w, z/w]; } as previously mentioned and shown in the functions above, the w component divides the x, y, and z components. when the w component is a non-zero real number then homogeneous coordinate easily translates back into a normal point in...
...And 5 more matches

Window.getComputedStyle() - Web APIs
the window.getcomputedstyle() method returns an object containing the values of all css properties of an element, after applying active stylesheets and resolving any basic computation those values may contain. individual css property values are accessed through apis provided by the object, or by indexing with css property names. syntax var style = window.getcomputedstyle(element [, pseudoelt]); element the element for which to get the computed style. pseudoeltoptional a string specifying the pseudo-element to match. omitted (or null) for real elements. the returned style is a live cssstyledeclaration object, which updates automatically when the element's styles are changed. throws typeerror if the passed object is not an element or the pseudoelt is not a valid pseudo-element se...
...however, the two objects have different purposes: the object from getcomputedstyle is read-only, and should be used to inspect the element's style — including those set by a <style> element or an external stylesheet. the element.style object should be used to set styles on that element, o...
...e; } javascript let para = document.queryselector('p'); let compstyles = window.getcomputedstyle(para); para.textcontent = 'my computed font-size is ' + compstyles.getpropertyvalue('font-size') + ',\nand my computed line-height is ' + compstyles.getpropertyvalue('line-height') + '.'; result description the returned object is the same cssstyledeclaration type as the object returned from the element's style property. however, the two objects have different purposes: the object from getcomputedstyle is read-only, and should be used to inspect the element's style — including those set by a <style> element or an external stylesheet. the element.style object should be used to set styles on that element, or inspect styles directly added to it from javascript manipulation ...
...And 5 more matches

Index - HTTP
ence, so that it allows a user to differentiate according to the users' own preferred language. 25 content-length http, headers, reference the content-length entity header indicates the size of the entity-body, in bytes, sent to the recipient. 26 content-location http, reference, header the content-location header indicates an alternate location for the returned data. the principal use is to indicate the url of a resource transmitted as the result of content negotiation. 27 content-range http, http header, reference, response header, header the content-range response http header indicates where in a full body message a partial message belongs. 28 content-security-policy csp, http, reference, security, header th...
...n frame, and in iframes that it embeds. 64 feature-policy: autoplay directive, feature policy, feature-policy, http, reference, autoplay the http feature-policy header autoplay directive controls whether the current document is allowed to autoplay media requested through the htmlmediaelement interface. when this policy is enabled and there were no user gestures, the promise returned by htmlmediaelement.play() will reject with a domexception. the autoplay attribute on <audio> and <video> elements will be ignored. 65 feature-policy: camera directive, feature policy, feature-policy, http, reference, camera the http feature-policy header camera directive controls whether the current document is allowed to use video input devices. when this policy is enable...
...ement.play() will reject with a domexception. the autoplay attribute on <audio> and <video> elements will be ignored. 65 feature-policy: camera directive, feature policy, feature-policy, http, reference, camera the http feature-policy header camera directive controls whether the current document is allowed to use video input devices. ...
...And 5 more matches

Grammar and types - JavaScript
et y = 5; } console.log(y); // referenceerror: y is not defined variable hoisting another unusual thing about variables in javascript is that you can refer to a variable declared later, without getting an exception. this concept is known as hoisting. variables in javascript are, in a sense, "hoisted" (or "lifted") to the top of the function or statement. ...
...iables in javascript is that you can refer to a variable declared later, without getting an exception. this concept is known as hoisting. variables in javascript are, in a sense, "hoisted" (or "lifted") to the top of the function or statement. however, variables that are hoisted return a value of undefined. so even if you declare and initialize after you use or refer to this variable, it still returns undefined. ...
...known as hoisting. variables in javascript are, in a sense, "hoisted" (or "lifted") to the top of the function or statement. however, variables that are hoisted return a value of undefined. so even if you declare and initialize after you use or refer to this variable, it still returns undefined. ...
...And 5 more matches

Text formatting - JavaScript
rogate halves separately to achieve the same result. see also string.fromcodepoint() or string.prototype.codepointat(). '\u{2f804}' // the same with simple unicode escapes '\ud87e\udc04' string objects the string object is a wrapper around the string primitive data type. const foo = new string('foo'); // creates a string object console.log(foo); // displays: [string: 'foo'] typeof foo; // returns 'object' you can call any of the methods of the string object on a string literal value—javascript automatically converts the string literal to a temporary string object, calls the method, then discards the temporary string object. you can also use the string.length property with a string literal. you should use string literals unless you specifically need to use a string object, because st...
...ary string object. you can also use the string.length property with a string literal. you should use string literals unless you specifically need to use a string object, because string objects can have counterintuitive behavior. for example: const firststring = '2 + 2'; // creates a string literal value const secondstring = new string('2 + 2'); // creates a string object eval(firststring); // returns the number 4 eval(secondstring); // returns the string "2 + 2" a string object has one property, length, that indicates the number of utf-16 code units in the string. for example, the following code assigns hellolength the value 13, because "hello, world!" has 13 characters, each represented by one utf-16 code unit. you can access each code unit using an array bracket style. you can't change in...
... value 13, because "hello, world!" has 13 characters, each represented by one utf-16 code unit. you can access each code unit using an array bracket style. you can't change individual characters because strings are immutable array-like objects: const hello = 'hello, world!'; const hellolength = hello.length; hello[0] = 'l'; // this has no effect, because strings are immutable hello[0]; // this returns "h" characters whose unicode scalar values are greater than u+ffff (such as some rare chinese/japanese/korean/vietnamese characters and some emoji) are stored in utf-16 with two surrogate code units each. for example, a string containing the single character u+1f600 "emoji grinning face" will have length 2. accessing the individual code units in such a string using brackets may have undesirabl...
...And 5 more matches

Public class fields - JavaScript
elow. both static and instance public fields are writable, enumerable, and configurable properties. as such, unlike their private counterparts, they participate in prototype inheritance. syntax class classwithinstancefield { instancefield = 'instance field' } class classwithstaticfield { static staticfield = 'static field' } class classwithpublicinstancemethod { publicmethod() { return 'hello world' } } examples public static fields public static fields are useful when you want a field to exist only once per class, not on every class instance you create. this is useful for caches, fixed-configuration, or any other data you don't need to be replicated across instances. public static fields are declared using the static keyword. they are added to the class constructor at t...
...lasswithstaticfield.basestaticfield) // expected output: "base field" when initializing fields, this refers to the class constructor. you can also reference it by name, and use super to get the superclass constructor (if one exists). ...
...ethod output" public instance fields public instance fields exist on every created instance of a class. by declaring a public field, you can ensure the field is always present, and the class definition is more self-documenting. public instance fields are added with object.defineproperty() either at construction time in the base class (before the constructor body runs), or just after super() returns in a subclass. class classwithinstancefield { instancefield = 'instance field' } const instance = new classwithinstancefield() console.log(instance.instancefield) // expected output: "instance field" fields without initializers are initialized to undefined. class classwithinstancefield { instancefield } const instance = new classwithinstancefield() console.assert(instance.hasownproperty...
...And 5 more matches