MediaStreamTrack.readyState - Web APIs
the mediastreamtrack.readystate read-only property returns an enumerated value giving the status of the track.
... syntax const state = track.readystate value it takes one of the following values: "live" which indicates that an input is connected and does its best-effort in providing real-time data.
... specifications specification status comment media capture and streamsthe definition of 'mediastreamtrack.readystate' in that specification.

ServiceWorkerContainer.ready - Web APIs
the ready read-only property of the serviceworkercontainer interface provides a way of delaying code execution until a service worker is active.
... syntax navigator.serviceworker.ready.then(function(serviceworkerregistration) { ...
... example if ('serviceworker' in navigator) { navigator.serviceworker.ready .then(function(registration) { console.log('a service worker is active:', registration.active); // at this point, you can call methods that require an active // service worker, like registration.pushmanager.subscribe() }); } else { console.log('service workers are not supported.'); } specifications specification status comment service workersthe definition of 'serviceworkerregistration.ready' in that specification.

XMLHttpRequest.readyState - Web APIs
the xmlhttprequest.readystate property returns the state an xmlhttprequest client is in.
...instead of unsent, opened, headers_received, loading and done, the names readystate_uninitialized (0), readystate_loading (1), readystate_loaded (2), readystate_interactive (3) and readystate_complete (4) are used.
... example var xhr = new xmlhttprequest(); console.log('unsent', xhr.readystate); // readystate will be 0 xhr.open('get', '/api', true); console.log('opened', xhr.readystate); // readystate will be 1 xhr.onprogress = function () { console.log('loading', xhr.readystate); // readystate will be 3 }; xhr.onload = function () { console.log('done', xhr.readystate); // readystate will be 4 }; xhr.send(null); specifications specification status comment xmlhttprequest living standard whatwg living standard ...

updateready - Archive of obsolete content
the updateready event is fired when the resources listed in the application cache manifest have been newly redownloaded, and the script can use swapcache() to switch to the new cache.
... related events checking noupdate downloading progress cached updateready obsolete error ...

FontFaceSet.ready - Web APIs
the ready readonly property of the fontfaceset interface returns a promise that resolves to the given fontfaceset.
... syntax fontfaceset.ready.then(function(fontfaceset) { // ...

Warning: -file- is being assigned a //# sourceMappingURL, but already has one - JavaScript
the javascript warning "-file- is being assigned a //# sourcemappingurl, but already has one." occurs when a source map has been specified more than once for a given javascript source.
... message warning: -file- is being assigned a //# sourcemappingurl, but already has one.

Index - Web APIs
77 animation.ready api, animation, experimental, property, ready, ready promise, reference, web animations, web animations api the read-only animation.ready property of the web animations api returns a promise which resolves when the animation is ready to play.
... a new promise is created every time the animation enters the "pending" play state as well as when the animation is canceled, since in both of those scenarios, the animation is ready to be started again.
... 180 audioprocessingevent api, deprecated, interface, internationalization, reference, référence(2), web audio api the web audio api audioprocessingevent represents events that occur when a scriptprocessornode input buffer is ready to be processed.
...And 70 more matches

tabs - Archive of obsolete content
tabs.on('ready', function(tab) { console.log('tab is loaded', tab.title, tab.url); }); access tabs the module itself can be used as a list of all opened tabs across all windows.
... in particular, you can enumerate it: var tabs = require('sdk/tabs'); for (let tab of tabs) console.log(tab.title); you can also access individual tabs by index: var tabs = require('sdk/tabs'); tabs.on('ready', function () { console.log('first: ' + tabs[0].title); console.log('last: ' + tabs[tabs.length-1].title); }); you can access the currently active tab: var tabs = require('sdk/tabs'); tabs.on('activate', function () { console.log('active: ' + tabs.activetab.url); }); track a single tab given a tab, you can register event listeners to be notified when the tab is closed, activated or deactivated, or when the page hosted by the tab is loaded or retrieved from the "back-forward cache": var tabs = require("sdk/tabs"); function onopen(tab) { console.log(tab.url + " is open")...
...ole.log(tab.url + " is activated"); } function logdeactivate(tab) { console.log(tab.url + " is deactivated"); } function logclose(tab) { console.log(tab.url + " is closed"); } tabs.on('open', onopen); manipulate a tab you can get and set various properties of tabs (but note that properties relating to the tab's content, such as the url, will not contain valid values until after the tab's ready event fires).
...And 16 more matches

sslfnc.html
to change a value in a socket that is already open, use ssl_optionset.
... as mentioned in communication, when an application imports a socket into ssl after the tcp connection on that socket has already been established, it must call ssl_resethandshake to determine whether the socket is for a client or server.
...however, these settings control the behavior of pr_connect and pr_accept only; if you don't call one of those functions after importing a non-ssl socket with ssl_import (as in the case of an already established tcp connection), ssl still needs to know whether the application is functioning as a client or server.
...And 14 more matches

Getting Started Guide
if you're already familiar with nscomptrs, then you might want to skip ahead to the reference manual or the faq.
...you should already know this, and should be able to just skim this short section.
... if this is unfamiliar material, you're not ready for nscomptrs yet.
...And 14 more matches

Streams - Plugins
the browser calls the plug-in methods npp_newstream, npp_writeready, npp_write, and npp_destroystream to, respectively, create a stream, find out how much data the plug-in can handle, push data into the stream, and delete it.
... the plug-in can set the output parameter type to one of these transmission modes: np_normal: (default): the plug-in can process the data progressively as it arrives from the network or file system through a series of calls to npp_writeready and npp_write.
... finding out how much data the plug-in can accept after a call to npp_newstream and before writing data to the plug-in, the browser calls npp_writeready to determine the maximum number of bytes that the plug-in can consume.
...And 14 more matches

Front-end web developer - Learn web development
for example, if you already know html, you can skip ahead to the css section.
... how will i know i'm ready to move on?
...it is important to get you set up and ready to do work for exercises later on in the course.
...And 11 more matches

Client-side storage - Learn web development
you are now ready to start adding code to it.
... inside the window.onload handler, add the following: // open our database; it is created if it doesn't already exist // (see onupgradeneeded below) let request = window.indexeddb.open('notes_db', 1); this line creates a request to open version 1 of a database called notes_db.
... if this doesn't already exist, it will be created for you by subsequent code.
...And 11 more matches

Index
6 creating a python xpcom component guide, needshelp, pyxpcom, xpcom, xpcom:language bindings creating applications with mozilla already provides a tutorial for making a simple javascript or c++ component (implementing the nsisimple interface).
...the result is structured cloned back to the original context, unless it is native (for example, if it returns a dom node, this is not structured cloned, because the original context will see that through an xraywrapper already), so it's guaranteed to behave predictably.
...any time a new value is assigned into an nscomptr, the nscomptr automatically always releases its old referent, if any, and (unless you tell it you already have) addrefs the new.
...And 11 more matches

Signaling and video calling - Web APIs
readying the chat server for signaling our chat server uses the websocket api to send information as json strings between each client and the server.
...since the message has already been stringified, we can send it with no further processing.
...each peer sends candidates in the order they're discovered, and keeps sending candidates until it runs out of suggestions, even if media has already started streaming.
...And 11 more matches

nsIFile
copyto() this method copies a source file to a new location if it does not already exist.
... ns_error_file_already_exists indicates that there is already a file named "newname" in the destination directory.
... copytofollowinglinks() this method copies a source file to a new location if it does not already exist.
...And 10 more matches

ui/frame - Archive of obsolete content
if the frame script initiates the conversation, you need to specify "*" as the origin: window.parent.postmessage("ping", "*"); if the frame script has received a message from the add-on already, it can use the origin property of the event object passed to the message hander: // listen for messages from the add-on, and send a reply window.addeventlistener("message", function(event) { event.source.postmessage("pong", event.origin) }, false); this frame script listens to change events on the "city-selector" <select> element, and sends a message to the add-on containing the value for th...
... toolbar } = require("sdk/ui/toolbar"); var frame = new frame({ url: "./city-info.html", onmessage: function(e) { // message only the frame that pinged us e.source.postmessage("pong", e.origin); } }); var toolbar = toolbar({ name: "ping-pong", title: "ping pong", items: [frame] }); this does not have to be the message event: the other events frame can emit: attach, load and ready, also provide access to source and origin.
... onready function assign a listener to the frame's ready event.
...And 9 more matches

HTTP Cache
important difference in behavior from the old cache: when the cache entry object is already present in memory or open as “force-new” (a.k.a “open-truncate”) this callback is invoked sooner then the asyncopenuri method returns (i.e.
... the writer stored all necessary meta data in the cache entry and called metadataready on it: other consumers now get the entry and may examine and potentially modify the meta data and read the data (if any) of the cache entry.
...the response payload) to write to the cache entry, it must open the output stream on it before it calls metadataready.
...And 9 more matches

OS.File for the main thread
the following variant does the same thing but will fail if "file.txt" already exists: let encoder = new textencoder(); // this encoder can be reused for several writes let array = encoder.encode("this is some text"); // convert the text to an array let promise = os.file.writeatomic("file.txt", array, // write the array atomically to "file.txt", using as temporary {tmppath: "file.txt.tmp", nooverwrite: t...
...promise = os.file.move(os.path.join('c:', 'jean', 'test.txt'), os.path.join('c:', 'jean', 'testrenamed.txt')); promise.then( function() { console.log('rename successful') }, function(arejectreason) { console.log('rename failed, arejectreason = ', arejectreason) } ) the nooverwrite true is important, as default is false which means if a file in the directory exists already with the same name it will no longer be there after this "rename" operation, which is a "move".
... file.close(); }, function onerror(reason) { file.close(); throw reason; }); return promise; } or a variant using task.js (or at least the subset already present on mozilla-central): let writestream = function writestream(data, outfile, chunksize) { return task.spawn(function() { let view = new uint8array(data); let pos = 0; while (pos < view.bytelength) { pos += yield outfile.write(view.subarray(pos, chunksize)); } outfile.close(); }).then( null, function onfailure(reason) { outfile.close(); thro...
...And 9 more matches

nsIZipWriter
ns_error_file_already_exists the specified path already exists in the zip file.
... ns_error_in_progress the zip writer is already performing another operation.
... ns_error_file_already_exists the specified path already exists in the zip file.
...And 9 more matches

Getting Started - Developer guides
at this stage, you need to tell the xmlhttp request object which javascript function will handle the response, by setting the onreadystatechange property of the object and naming it after the function to call when the request changes state, like this: httprequest.onreadystatechange = nameofthefunction; note that there are no parentheses or parameters after the function name, because you're assigning a reference to the function, rather than actually calling it.
... alternatively, instead of giving a function name, you can use the javascript technique of defining functions on the fly (called "anonymous functions") to define the actions that will process the response, like this: httprequest.onreadystatechange = function(){ // process the server response here.
...for example, use the following before calling send() for form data sent as a query string: httprequest.setrequestheader('content-type', 'application/x-www-form-urlencoded'); step 2 – handling the server response when you sent the request, you provided the name of a javascript function to handle the response: httprequest.onreadystatechange = nameofthefunction; what should this function do?
...And 9 more matches

Index - Archive of obsolete content
135 cfx to jpm cfx, jpm, sdk, add-on a guide to working with jpm if you're already familiar with cfx.
...after the "escrowauthoritycert" parameter, the method takes some javascript code that is invoked when the crmf request is ready.
...the private key for the certificates must already reside in the user's personal private key database.
...And 8 more matches

WebIDL bindings
dosomethingelse(optional long maybenumber); [throws] void dosomethingelse(myinterface otherinstance); void dotheother(any something); void doyetanotherthing(optional boolean actuallydoit = false); static void staticoperation(any arg); }; will require these method declarations: class myclass { void dosomething(int32_t anumber); double dosomething(myclass* aotherinstance); already_addrefed<myinterface> dosomethingelse(optional<int32_t> amaybenumber, errorresult& rv); void dosomethingelse(myclass& aotherinstance, errorresult& rv); void dotheother(jscontext* cx, js::value asomething); void doyetanotherthing(bool aactuallydoit); static void staticoperation(const globalobject& aglobal, js::value asomething); } c++ re...
... for example, this idl: [constructor, constructor(unsigned long somenumber)] interface myinterface { }; will require the following declarations in myclass: class myclass { // various nsisupports stuff or whatnot static already_addrefed<myclass> constructor(const globalobject& aglobal, errorresult& rv); static already_addrefed<myclass> constructor(const globalobject& aglobal, uint32_t asomenumber, errorresult& rv); }; c++ reflections of webidl types the exact c++ representation for webidl types ...
... date mozilla::dom::date domstring const nsastring& mozilla::dom::domstring& (outparam) nsastring& (outparam) nsstring& (outparam) nsstring utf8string const nsacstring& nsacstring& (outparam) nscstring double double double double float float float float interface: non-nullable foo& already_addrefed<foo> foo* owningnonnull<foo> interface: nullable foo* already_addrefed<foo> foo* refptr<foo> long int32_t int32_t int32_t long long int64_t int64_t int64_t object js::handle<jsobject*> js::mutablehandle<jsobject*> jsobject* octet uint8_t uint8_t uint8_t sequence cons...
...And 8 more matches

DevTools API - Firefox Developer Tools
toolbox-ready(toolbox) a new toolbox has been created and is ready to use.
... {toolid}-ready(toolbox, panel) a tool with the given id has finished its initialization and is ready to be used.
... getpanelwhenready(toolid) similar to getpanel() but waits for the tool to load first.
...And 8 more matches

dev/panel - Archive of obsolete content
you can use the class utility function: const { panel } = require("dev/panel"); const { class } = require("sdk/core/heritage"); const mypanel = class({ extends: panel, label: "my panel", tooltip: "my new devtool", icon: "./my-devtool.png", url: "./my-devtool.html", setup: function(options) { // my setup goes here }, dispose: function() { // my teardown goes here }, onready: function() { // i can send messages to // the panel document here } }); alternatively, you can use the extend function: const { extend } = require("sdk/core/heritage"); function mypanel() {}; mypanel.prototype = extend(panel.prototype, { label: "my panel", tooltip: "...", ....
... optional onready function an event handler that will be called when the document in the panel becomes interactive.
... it's equivalent to document.readystate === "interactive".
...And 7 more matches

Error codes returned by Mozilla APIs
ns_error_already_initialized (0xc1f30002) an attempt is made to initialize a component or object again which has already been initialized.
... ns_error_file_already_exists (0x80520008) an attempt was made to create a file that already exists.
... ns_error_file_is_locked (0x8052000e) this error indicates that a file cannot be accessed because it is locked, typically because the file is already being used by another application.
...And 7 more matches

Extending a Protocol
implementing the navigator.echo() in your favorite editor, open dom/webidl/navigator.webidl at the end of the file, add: partial interface navigator { [throws] promise<domstring> echo(domstring astring); }; now we need to implement the echo() method in c++, so open up ./dom/base/navigator.h and let's add the method definition, so under public:: already_addrefed<promise> echo(const nsastring& astring, errorresult& arv); we use nsastring& as the domstring comes in from js as utf-16.
... 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!
... defining windowglobalparent's alloc/deallocpechoparent() open up dom/ipc/windowglobalparent.h and we are going to add two things: at the top, add #include "mozilla/dom/echoparent.h" and then, as part of the windowglobalparent class definition, add the following two public methods: already_addrefed<echoparent> allocpechoparent(); bool deallocpechoparent(pechoparent* aactor); natrually, we will have to do the alloc/dealloc dance for the children too.
...And 6 more matches

L20n Javascript API
you can listen to the ready event (emitted by the context instance when all the resources have been compiled) and use ctx.getsync and ctx.getentitysync to get translations synchronously.
... alternatively, you can register callbacks to execute when the context is ready (or when globals change and translations need to be updated) with ctx.localize.
...this array (with defaultlocale appended to it if it is not already present) will be used to negotiate the fallback chain for the user.
...And 6 more matches

Index
a trust anchor is just another x.509 certificate that is already known and has been deliberately marked as trusted by a software vendor, administrators inside an organizational infrastructure, or the software user.
...when using an ssl network connection, you'll already have two layers, the basic nspr layer and an ssl library layer.
...(note: mozilla does not distribute a "fips mode"-ready nss with firefox.) this page attempts to provide an informal explanation of what it is, who would use it, and why.
...And 6 more matches

Necko walkthrough
nspipeinputstream::asyncwait sets the callback to be used later for a response if a target is specified (in this case, the main thread), callback is proxied via an nsinputstreamreadyevent, which is created now and may be called later otherwise, the callback would be called directly, when the socket is readable et voila, the transaction has been posted to the socket thread, and the main thread continues on, unblocked from network io.
... if a connection entry already exists matching the required conn info, then that one will be used; otherwise a new one is created (makenewconnection - creates socket etc.).
... nshttpconnection::activate this connection is passed the transaction nshttpconnection::onoutputstreamready nshttpconnection::onsocketwritable tries to write the request data from the current transaction (mtransaction) tells the transaction to now wait (`resumerecv) nshttpconnection::resumerecv nshttptransaction::readsegments readrequestsegment is passed to mrequeststream->readsegments - this function pointer is called and used to read the request bytes, which in turn calls ...
...And 6 more matches

Starting WebLock
we have already created a module that implements most of the generic component functionality (e.g.
...this process is similar to using createinstance from the nsicomponentmanager, but there is no aggregation parameter since the object has already been constructed.
... there are two startup notifications, both of which create the observer if it isn't already created.
...And 6 more matches

Event reference
media events event name fired when audioprocess the input buffer of a scriptprocessornode is ready to be processed.
... emptied the media has become empty; for example, this event is sent if the media has already been loaded (or partially loaded), and the load() method is called to reload it.
... playing playback is ready to start after having been paused or delayed due to lack of data.
...And 6 more matches

page-mod - Archive of obsolete content
attachto controls whether to attach scripts to tabs that were already open when the page-mod was created, and whether to attach scripts to iframes as well as the topmost document.
... for example, if you maintain a list of workers attached to a page-mod: var workers = []; var pagemod = require("sdk/page-mod").pagemod({ include: ['*'], contentscriptwhen: 'ready', contentscriptfile: data.url('pagemod.js'), onattach: function(worker) { workers.push(worker); } }); you can remove workers when they are no longer valid by listening to detach: var workers = []; function detachworker(worker, workerarray) { var index = workerarray.indexof(worker); if(index != -1) { workerarray.splice(index, 1); } } var pagemod = require("sdk/page-mod").pa...
...gemod({ include: ['*'], contentscriptwhen: 'ready', contentscriptfile: data.url('pagemod.js'), onattach: function(worker) { workers.push(worker); worker.on('detach', function () { detachworker(this, workers); }); } }); cleaning up on add-on removal content scripts receive a detach message when the add-on that attached them is disabled or removed: you can use this in the content script to undo any changes that you've made.
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Index - Learn web development
you've seen this stuff already in the course, but only in passing — here we'll discuss it all explicitly.
... 140 css layout beginner, css, floating, grids, guide, landing, layout, learn, module, multiple column, positioning, alignment, flexbox, float, table at this point we've already looked at css fundamentals, how to style text, and how to style and manipulate the boxes that your content sits inside.
... 153 test your skills: fundamental layout comprehension assessment, beginner, css, layout, learn if you have worked through this module then you will have already covered the basics of what you need to know to do css layout today, and to work with older css as well.
...And 5 more matches

Introducing a complete toolchain - Learn web development
in addition, you should include tests before you deploy to your production server to ensure your software works as intended — this already sounds like a necessary toolchain.
... once you've signed up for github (click the sign up link on the homepage if you don't already have an account, and follow the instructions), you can use your github account for authentication on netlify (click sign up, then choose github from the "sign up with one of the following" list), so technically you only need to create one new account.
...you should have node.js and npm installed already, but if not, refer back to that section.
...And 5 more matches

sslerr.html
sec_error_duplicate_cert -8170 certificate already exists in your database.
... sec_error_duplicate_cert_name -8169 downloaded certificate's name duplicates one already in your database.
... sec_error_cert_nickname_collision -8124 a certificate with the same nickname already exists.
...And 5 more matches

Bytecode Descriptions
val must already be a numeric value, such as the result of jsop::tonumeric.
...there must not already be a generator object for the current frame (that is, this instruction must execute at most once per generator or async call).
...if the current function is an async function or async generator, the frame's return value slot must contain the current frame's result promise, which must already be resolved or rejected.
...And 5 more matches

nsIAccessibleRetrieval
create a new accessible of the appropriate type if necessary, or use one from the accessibility cache if it already exists.
...create a new accessible of the appropriate type if necessary, or use one from the accessibility cache if it already exists.
...create a new accessible of the appropriate type if necessary, or use one from the accessibility cache if it already exists.
...And 5 more matches

Reference Manual
this section will help you if you're already familiar with nscomptr but you need details.
...e(nsisupports*, nsresult*) do_queryreferent(nsiweakreference*), do_queryreferent(nsiweakreference*, nsresult*) don't addref dont_addref(t*), getter_addrefs(t*) n/a e.g., one of the possibilities for assigning into an nscomptr, but you don't want to addref the pointer you are assigning (because it has already been addrefed for some reason) is dont_addref(t*) found at the intersection of "don't addref" and "don't qi".
...nscomptr<nsifoo> foo( dont_queryinterface(afooptr) ); // or foo = dont_queryinterface(afooptr); by using this form, you are promising that the pointer you are assigning in is already a pointer to the xpcom-correct interface matching the nscomptrs underlying type, in this case, nsifoo.
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Using IndexedDB - Web APIs
if the database doesn't already exist, it is created by the open operation, then an onupgradeneeded event is triggered and you create the database schema in the handler for this event.
...you should create the object stores needed for this version of the database: // this event is only implemented in recent browsers request.onupgradeneeded = function(event) { // save the idbdatabase interface var db = event.target.result; // create an objectstore for this database var objectstore = db.createobjectstore("name", { keypath: "mykey" }); }; in this case, the database will already have the object stores from the previous version of the database, so you do not have to create these object stores again.
...if you need to save that information, you should read it out and save it somewhere else before upgrading the database.) trying to create an object store with a name that already exists (or trying to delete an object store with a name that does not already exist) will throw an error.
...And 5 more matches

widget - Archive of obsolete content
scripting trusted widget content we've already seen that you can package html files in your add-on's data directory and use them to define the widget's content.
...widgets.widget({ id: "auto-update-widget", label: "widget that updates content on a timer", content: "0", contentscript: 'settimeout(function() {' + ' document.body.innerhtml++;' + '}, 2000)', contentscriptwhen: "ready" }); // a widget created with a specified width, that grows.
...var widget = widgets.widget({ id: "message-test", label: "bi-directional communication!", content: "<foo>bar</foo>", contentscriptwhen: "ready", contentscript: 'self.on("message", function(message) {' + ' alert("got message: " + message);' + '});' + 'self.postmessage("ready");', onmessage: function(message) { if (message == "ready") widget.postmessage("me too"); } }); globals constructors widget(options) creates a new widget.
...And 4 more matches

CSS3 - Archive of obsolete content
while some modules are already w3c recommendations, other still are early working drafts.
...some modules, like selectors 4 or css borders and backgrounds level 4 already have an editor's draft, though they haven't yet reached the first published working draft status.
... css modules status completed modules a few css modules already became a standard as a w3c recommendation.
...And 4 more matches

MMgc - Archive of obsolete content
it has a get method which returns the pointer to the original object, or null if that object has already been destroyed.
...in order to be correct we must account for a new or unmarked object being stored into an object we've already marked.
... in implementation terms this means a new or unmarked object is stored in an object that has already been processed by the marking algorithm and is no longer in the queue.
...And 4 more matches

JavaScript Client API - Archive of obsolete content
depending of what type of data you're working with, you might already have guids built into your data that you can make use of (note that guids must be allowed to change and should be url friendly).
...unless the items you're syncing have their own inherent guids already defined, you'll need to invent guids for all your items at this time.
... invent guids for any items // that don't have them already, and remember the mapping for later use.
...And 4 more matches

Building up a basic demo with A-Frame - Game development
the webxr and webgl apis already enable us to start creating virtual reality (vr) experiences inside web browsers, but the community is still waiting for tools and libraries to appear, to make this easier.
... high level overview the current version of a-frame is 0.3.2, which means it's highly experimental, but it already works and you can test it right away in the browser.
...add it now: <a-box color="#0095dd" position="0 1 0" rotation="20 40 0"> </a-box> it contains a few parameters already defined: color, position and rotation — these are fairly obvious, and define the base color of the cube, the position inside the 3d scene, and the rotation of the cube.
...And 4 more matches

TypeScript support in Svelte - Learn web development
code along with us git clone the github repo (if you haven't already done it) with: git clone https://github.com/opensas/mdn-svelte-tutorial.git then to get to the current app state, run cd mdn-svelte-tutorial/07-typescript-support or directly download the folder's content: npx degit opensas/mdn-svelte-tutorial/07-typescript-support remember to run npm install && npm run dev to start your app in development mode.
...thanks to the hard work of the svelte team, together with many contributors, we have an official solution ready to be put to the test.
... porting our to-do list app to typescript now we are ready to start porting our to-list application to take advantage of all the features that typescript offers to us.
...And 4 more matches

Package management basics - Learn web development
you could certainly code this yourself, but there's a strong chance that someone else has already solved this problem — why waste time reinventing the wheel?
... we've met npm already, but stepping back from npm itself, a package manager is a system that will manage your project dependencies.
... installing parcel run the following command to install parcel locally: npm install parcel-bundler once that's done all the things, we're now ready for some "modern client-side development" (which really means using build tools to make the developer experience a little easier).
...And 4 more matches

Accessible Toolkit Checklist
the approaches there are two basic kinds of toolkits, which each provide different challenges when implementing accessibility: native widget toolkits , like eclipse and wxwidgets, already have some accessibility built-in.
...since the individual widgets predominately come from the operating system, they already implement standard keyboard commands and follow the operating system's visual theme.
... also, assistive technologies already understand native widgets so it is only necessary to implement microsoft active accessibility (msaa) api support for custom controls.
...And 4 more matches

nsIXPConnect
nsixpconnectwrappednative getwrappednativeofjsobject( in jscontextptr ajscontext, in jsobjectptr ajsobj ); parameters ajscontext missing description ajsobj missing description return value missing description exceptions thrown missing exception missing description getwrappednativeofnativeobject() this only succeeds if the native object is already wrapped by xpconnect.
... note: in c++, the out jsval parameter must already be a strong gc root.
... nsixpconnectjsobjectholder holdobject( in jscontextptr ajscontext, in jsobjectptr aobject ); parameters ajscontext missing description aobject missing description return value missing description exceptions thrown missing exception missing description initclasses() initializes classes on a global object that has already been created.
...And 4 more matches

Using writable streams - Web APIs
write(chunk,controller) — a method that is called repeatedly every time a new chunk is ready to be written to the underlying sink (specified in the chunk parameter).
...: sendmessage("hello, world.", writablestream); the sendmessage() definition looks like so: function sendmessage(message, writablestream) { // defaultwriter is of type writablestreamdefaultwriter const defaultwriter = writablestream.getwriter(); const encoder = new textencoder(); const encoded = encoder.encode(message, { stream: true }); encoded.foreach((chunk) => { defaultwriter.ready .then(() => { return defaultwriter.write(chunk); }) .then(() => { console.log("chunk written to sink."); }) .catch((err) => { console.log("chunk error:", err); }); }); // call ready again to ensure that all chunks are written // before closing the writer.
... defaultwriter.ready .then(() => { defaultwriter.close(); }) .then(() => { console.log("all chunks written"); }) .catch((err) => { console.log("stream error:", err); }); } so here we create a writer to write the chunks to the stream using writablestream.getwriter().
...And 4 more matches

Cross-browser audio basics - Developer guides
// associate functions with the 'onclick' events play.onclick = playaudio; pause.onclick = pauseaudio; function playaudio() { myaudio.play(); } function pauseaudio() { myaudio.pause(); } } media loading events above we have shown how you can create a very simple audio player, but what if we want to show progress, buffering and only activate the buttons when the media is ready to play?
...the playhead is in position but not quite ready to play.
... myaudio.addeventlistener("progress", function() { // you could let the user know the media is downloading }); canplay canplay is a useful event to detect should you want to determine whether the media is ready to play.
...And 4 more matches

ui/sidebar - Archive of obsolete content
there are two events emitted by the sidebar which will give you a worker: attach and ready.
... listen to attach if the first message in your add-on goes from the sidebar scripts to the main add-on code, and listen to ready if the first message goes from the main add-on code to the sidebar script.
...you should see console output like: console.log: add-on: add-on script got the message console.log: add-on: sidebar script got the reply using ready the ready event is emitted when the dom for the sidebar's content is ready.
...And 3 more matches

New Skin Notes - Archive of obsolete content
devmo has a new skin that is ready for testing.
...there's no real reason for user to give him info that he already visited xml main page.
...it looks odd when someone who uses devmo on regular basis sees some violet links just because he already worked with this site yesterday.also, the current color for visited links makes them less visible.
...And 3 more matches

Using XPInstall to Install Plugins - Archive of obsolete content
for plugin vendors who have already written a native code (e.g.
...rather than re-initiate the download of the plugin with the yet another browser, the second netscape gecko browser can detect that an installation has already occurred.
...in a nutshell, the first install problem can be summed up by the question: how can a browser which is installed on a user's machine after a given plugin has already been installed by the user benefit from the existing installation rather than download the same plugin again?
...And 3 more matches

NPP_NewStream - Archive of obsolete content
np_normal (default): delivers stream data to the instance in a series of calls to npp_writeready and npp_write.
...values: np_normal (default): delivers stream data to the instance in a series of calls to npp_writeready and npp_write.
...if the stream comes from a local file, the npp_write and npp_writeready functions are not called.
...And 3 more matches

NPP_Write - Archive of obsolete content
if the return value is smaller than the size of the buffer, the browser sends the remaining data to the plug-in through subsequent calls to npp_writeready and npp_write.
...description the browser calls the npp_write function to deliver the data specified in a previous npp_writeready call to the plug-in.
... a plug-in must consume at least as many bytes as indicated in the npp_writeready call.
...And 3 more matches

Understanding client-side JavaScript frameworks - Learn web development
we are not aiming to exhaustively teach you everything you need to know about react/reactdom, or vue, or some other specific framework; the framework teams' own docs (and other resources) do that job already.
...this article will walk you through putting the basic app component structure and styling in place, ready for individual component definition and interactivity, which we'll add later.
...getting started with ember in our first ember article we will look at how ember works and what it's useful for, install the ember toolchain locally, create a sample app, and then do some initial setup to get it ready for development.
...And 3 more matches

Introduction to automated testing - Learn web development
(if you already have node and npm installed, jump to point 4) install it like you would any other program.
... 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.
...you can customize it later, but for now it'll look something like this: { "name": "node-test", "version": "1.0.0", "description": "test for npm projects", "main": "index.js", "scripts": { "test": "test" }, "author": "chris mills", "license": "mit" } with this, you are ready to move on.
...And 3 more matches

Handling common JavaScript problems - Learn web development
if you are not already familiar with the basics of troubleshooting javascript, you should study that article before moving on.
... 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.
... the console api you may already know what is wrong with this code, but let's explore it some more to show how you could investigate this.
...And 3 more matches

Application Translation with Mercurial
if it is 'translated', the branch has already been translated.
... progress tracking tool to track which strings and files already have been translated and later also to see which new strings have already been tested in the product as being a good translation for the functionality behind the translated strings and that the translated texts fit into the available, the translation progress should be tracked.
... go back to the localization directory: cd /c/mozilla/de-mozilla-aurora initiate mercurial queues: hg qinit get to know the translation style for having good chances that the translation suggestions get accepted, they should match the translation style of the texts in the application already translated.
...And 3 more matches

Index
you also need to determine if a localization effort already exists for your locale.
...now you're ready for the final phase: becoming an official l10n release.
...editing the raw xliff file is also rather easy, especially if you're already familiar with xml.
...And 3 more matches

Localizing with Koala
s removed, 0 files unresolved configure the locale locale id: x-testing (put your locale's code) version: 3.6 location: choose the folder where you want to keep the localized files or leave empty for now check "mercurial" if you wish to use mercurial to keep the revision history of your files (very recommended) existing localizations: url: if you're editing an existing localization or you already have a repository set up (either on hg.mozilla.org or bitbucket), type the url of the remote repository, e.g.
...new localizations: url: if you already have a repository set up by l10n-drivers (on bitbucket), type the url of the remote repository, e.g.
...just open the console and issue the following commands: c:\users\stas> cd c:\mozilla\l10n\locale\x-testing c:\mozilla\l10n\locale\x-testing> rmdir 3.6 c:\mozilla\l10n\locale\x-testing> hg clone http://hg.mozilla.org/releases/l10n-mozilla-1.9.2/x-testing 3.6 new localizations: if you have the bitbucket repository already set up by l10n-drivers, the steps are the same as above.
...And 3 more matches

Release phase
now you're ready for the final phase: becoming an official l10n release.
...depending on which branch you work on, the url of your repository might look like this: http://hg.mozilla.org/releases/l10n-central/x-testing if you followed the koala or plain text approach, you probably already have a local clone of the repository.
...consequently, if you already have a local clone that you pulled using http, you'll need to modify a config file to tell mercurial to push through ssh.
...And 3 more matches

Mozilla DOM Hacking Guide
we already know what nsixpcscriptable is used for (see the previous section).
... static prbool sisinitialized: keeps track of wether class info was already initialized, because init() shouldn't be called twice.
...this object already implements the domimplementation interface, but dom2 html says it should also implement the htmldomimplementation interface, so here we go.
...And 3 more matches

Midas
if there is a selection and all of the characters are already bold, the bold will be removed.
... if there is a selection and all of the characters are already italic, the italic will be removed.
... if there is a selection and all of the characters are already striked, the strikethrough will be removed.
...And 3 more matches

Introduction to NSPR
preempting threads preemption is the act of taking control away from a ready thread at an arbitrary point and giving control to another appropriate thread.
... it might be viewed as taking the executing thread and adding it to the end of the ready queue for its appropriate priority, then simply running the scheduling algorithm to find the most appropriate thread.
...should another thread (or the same thread) already have the lock held, the calling thread blocks, waiting for the situation to improve.
...And 3 more matches

PR_Poll
detects when i/o is ready for a set of socket file descriptors.
... timeout amount of time the call will block waiting for i/o to become ready.
... if this time expires without any i/o becoming ready, pr_poll returns zero.
...And 3 more matches

sslintro.html
it is also possible for an application to import a socket into ssl after the tcp connection on that socket has already been established.
... in this case, initial configuration takes place in the same way: pass the existing nspr file descriptor to ssl_importfd and perform any additional configuration that has not already been determined by the model file descriptor.
...these can be used, for example, when interrupting and restarting socket communications, when the application needs to change socket parameters, or when an application imports a socket into ssl after the tcp connection on that socket has already been established.
...And 3 more matches

GCIntegration - SpiderMonkey Redirect 1
at a high level, there are three issues to be aware of: interactions between the garbage collector and the cycle collector incremental garbage collection moving garbage collection the apis for gc/cc interaction and incremental gc are already in place.
... {{ svg{source: "http://people.mozilla.org/~wmccloskey/incremental1.svg", embedding: "iframe", height:"130"} }} assume object b is already marked, as in the leftmost frame, while objects a and c have not been marked yet.
...assume that an incremental gc has already started, and a and b have been marked.
...And 3 more matches

Introduction to XPCOM for the DOM
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!".
...we have already seen what getter_addrefs() does to nscomptr's.
... build system this is the really easy part: it's just copying what's already there.
...And 3 more matches

nsIAsyncInputStream
method overview void asyncwait(in nsiinputstreamcallback acallback, in unsigned long aflags, in unsigned long arequestedcount, in nsieventtarget aeventtarget); void closewithstatus(in nsresult astatus); constants constant value description wait_closure_only (1<<0) if passed to asyncwait(), this flag overrides the default behavior, causing the oninputstreamready notification to be suppressed until the stream becomes closed (either as a result of closewithstatus()/close being called on the stream or possibly due to some error in the underlying stream).
...after the oninputstreamready event is dispatched, the stream releases its reference to the nsiinputstreamcallback object.
...in other words, this method may be called when the stream already has data to read.
...And 3 more matches

nsIAsyncOutputStream
method overview void asyncwait(in nsioutputstreamcallback acallback, in unsigned long aflags, in unsigned long arequestedcount, in nsieventtarget aeventtarget); void closewithstatus(in nsresult reason); constants constant value description wait_closure_only (1<<0) if passed to asyncwait(), this flag overrides the default behavior, causing the onoutputstreamready notification to be suppressed until the stream becomes closed (either as a result of closewithstatus()/close being called on the stream or possibly due to some error in the underlying stream).
...after the nsioutputstreamcallback.onoutputstreamready() event is dispatched, the stream releases its reference to the nsioutputstreamcallback object.
...in other words, this method may be called when the stream already has room for more data.
...And 3 more matches

Background Tasks API - Web APIs
currently, timeremaining() has an upper limit of 50 milliseconds, but in reality you will often have less time than that, since the event loop may already be eating into that time on complex sites, with browser extensions needing processor time, and so forth.
...by the time your callback is run, the current frame has already finished drawing, and all layout updates and computations have been completed.
... statusrefreshscheduled is used to track whether or not we've already scheduled an update of the status display box for the upcoming frame, so that we only do it once per frame the shim to function even if idle callbacks aren't supported.
...And 3 more matches

DirectoryEntrySync - Web APIs
object literal condition result create: true exclusive: true path already exists an error is thrown.
...if a file already exists, no error is thrown.
... path_exists_err the file already exists.
...And 3 more matches

Using the Notifications API - Web APIs
firefox is already doing this from version 72, for example, and safari has done it for some time.
... checking current permission status you can check to see if you already have permission by checking the value of the notification.permission read only property.
...we don't want to show it if permission has already been granted, but if the user chose to deny permission, we want to give them the chance to change their mind later on.
...And 3 more matches

SVGLengthList - Web APIs
if the inserted item is already in a list, it is removed from its previous list before it is inserted into this list.
...if newitem is already in a list, it is removed from its previous list before it is inserted into this list.
...if the item is already in this list, note that the index of the item to insert before is before the removal of the item.
...And 3 more matches

SVGNumberList - Web APIs
if the inserted item is already in a list, it is removed from its previous list before it is inserted into this list.
... if newitem is already in a list, it is removed from its previous list before it is inserted into this list.
...if the item is already in this list, note that the index of the item to insert before is before the removal of the item.
...And 3 more matches

SVGPathSegList - Web APIs
if the inserted item is already in a list, it is removed from its previous list before it is inserted into this list.
... if newitem is already in a list, it is removed from its previous list before it is inserted into this list.
...if the item is already in this list, note that the index of the item to insert before is before the removal of the item.
...And 3 more matches

SVGPointList - Web APIs
if the inserted item is already in a list, it is removed from its previous list before it is inserted into this list.
...if newitem is already in a list, it is removed from its previous list before it is inserted into this list.
...if the item is already in this list, note that the index of the item to insert before is before the removal of the item.
...And 3 more matches

SVGStringList - Web APIs
if the inserted item is already in a list, it is removed from its previous list before it is inserted into this list.
...if newitem is already in a list, it is removed from its previous list before it is inserted into this list.
...if the item is already in this list, note that the index of the item to insert before is before the removal of the item.
...And 3 more matches

SVGTransformList - Web APIs
if the inserted item is already in a list, it is removed from its previous list before it is inserted into this list.
...if newitem is already in a list, it is removed from its previous list before it is inserted into this list.
...if the item is already in this list, note that the index of the item to insert before is before the removal of the item.
...And 3 more matches

Window.open() - Web APIs
=yes,status=yes"; function openrequestedpopup() { windowobjectreference = window.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.
...*/ }; } </script> (...) <p><a href="http://www.spreadfirefox.com/" target="promotefirefoxwindowname" onclick="openffpromotionpopup(); return false;" title="this link will create a new window or will re-use an already opened one" >promote firefox adoption</a></p> the above code solves a few usability problems related to links opening secondary window.
...ctreference.closed) { windowobjectreference = window.open(url, windowname, "resizable,scrollbars,status"); } else { windowobjectreference.focus(); }; } </script> (...) <p><a href="http://www.spreadfirefox.com/" target="promotefirefoxwindow" onclick="openrequestedpopup(this.href, this.target); return false;" title="this link will create a new window or will re-use an already opened one" >promote firefox adoption</a></p> you can also make such function able to open only 1 secondary window and to reuse such single secondary window for other links in this manner: <script type="text/javascript"> var windowobjectreference = null; // global variable var previousurl; /* global variable that will store the url currently in the secondary window */ func...
...And 3 more matches

WritableStream.WritableStream() - Web APIs
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.
... const list = document.queryselector('ul'); function sendmessage(message, writablestream) { // defaultwriter is of type writablestreamdefaultwriter const defaultwriter = writablestream.getwriter(); const encoder = new textencoder(); const encoded = encoder.encode(message, { stream: true }); encoded.foreach((chunk) => { defaultwriter.ready .then(() => { return defaultwriter.write(chunk); }) .then(() => { console.log("chunk written to sink."); }) .catch((err) => { console.log("chunk error:", err); }); }); // call ready again to ensure that all chunks are written // before closing the writer.
... defaultwriter.ready .then(() => { defaultwriter.close(); }) .then(() => { console.log("all chunks written"); }) .catch((err) => { console.log("stream error:", err); }); } const decoder = new textdecoder("utf-8"); const queuingstrategy = new countqueuingstrategy({ highwatermark: 1 }); let result = ""; const writablestream = new writablestream({ // implement the sink write(chunk) { return new promise((resolve, reject) => { var buffer = new arraybuffer(2); var view = new uint16array(buffer); view[0] = chunk; var decoded = decoder.decode(view, { stream: true }); var listitem = document.createelement('li'); listitem.textcontent = "chunk decoded: " + decoded; list.appendchild(listitem); result += dec...
...And 3 more matches

Using Promises - JavaScript
since most people are consumers of already-created promises, this guide will explain consumption of returned promises before explaining how to create them.
... here's some code that uses createaudiofileasync(): function successcallback(result) { console.log("audio file ready at url: " + result); } function failurecallback(error) { console.error("error generating audio file: " + error); } createaudiofileasync(audiosettings, successcallback, failurecallback); modern functions return a promise that you can attach your callbacks to instead: if createaudiofileasync() were rewritten to return a promise, using it could be as simple as this: createaudiofileasync(audi...
... in an ideal world, all asynchronous functions would already return promises.
...And 3 more matches

Promise - JavaScript
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.
...promises in javascript represent processes that are already happening, which can be chained with callback functions.
... const promisea = new promise(myexecutorfunc); const promiseb = promisea.then(handlefulfilled1, handlerejected1); const promisec = promisea.then(handlefulfilled2, handlerejected2); an action can be assigned to an already "settled" promise.
...And 3 more matches

Working with Events - Archive of obsolete content
for example, the following add-on registers a listener with the tabs module to listen for the ready event, and logs a string to the console reporting the event: var tabs = require("sdk/tabs"); tabs.on("ready", function () { console.log("tab loaded"); }); it is not possible to enumerate the set of listeners for a given event.
... adding listeners in constructors event emitters may be modules, as is the case for the ready event above, or they may be objects returned by constructors.
... in the latter case the options object passed to the constructor typically defines properties whose names are the names of supported event types prefixed with "on": for example, "onopen", "onready" and so on.
...And 2 more matches

jspage - Archive of obsolete content
}else{if(c[a]){c[a].keys.each(function(e){this.addevent(a,e);},this);}}return this;}});element.nativeevents={click:2,dblclick:2,mouseup:2,mousedown:2,contextmenu:2,mousewheel:2,dommousescroll:2,mouseover:2,mouseout:2,mousemove:2,selectstart:2,selectend:2,keydown:2,keypress:2,keyup:2,focus:2,blur:2,change:2,reset:2,select:2,submit:2,load:1,unload:1,beforeunload:2,resize:1,move:1,domcontentloaded:1,readystatechange:1,error:1,abort:1,scroll:1}; (function(){var a=function(b){var c=b.relatedtarget;if(c==undefined){return true;}if(c===false){return false;}return($type(this)!="document"&&c!=this&&c.prefix!="xul"&&!this.haschild(c)); };element.events=new hash({mouseenter:{base:"mouseover",condition:a},mouseleave:{base:"mouseout",condition:a},mousewheel:{base:(browser.engine.gecko)?"dommousescroll":"mou...
...%c.a==c.b); },index:function(a){var b=this,c=0;while((b=b.previoussibling)){if(b.nodetype==1&&++c>a){return false;}}return(c==a);},even:function(b,a){return selectors.pseudo["nth-child"].call(this,"2n+1",a); },odd:function(b,a){return selectors.pseudo["nth-child"].call(this,"2n",a);},selected:function(){return this.selected;},enabled:function(){return(this.disabled===false); }});element.events.domready={onadd:function(a){if(browser.loaded){a.call(this);}}};(function(){var b=function(){if(browser.loaded){return;}browser.loaded=true; window.fireevent("domready");document.fireevent("domready");};window.addevent("load",b);if(browser.engine.trident){var a=document.createelement("div"); (function(){($try(function(){a.doscroll();return document.id(a).inject(document.body).set("html","temp").dispose();...
...}))?b():arguments.callee.delay(50);})(); }else{if(browser.engine.webkit&&browser.engine.version<525){(function(){(["loaded","complete"].contains(document.readystate))?b():arguments.callee.delay(50); })();}else{document.addevent("domcontentloaded",b);}}})();var json=new hash(this.json&&{stringify:json.stringify,parse:json.parse}).extend({$specialchars:{"\b":"\\b","\t":"\\t","\n":"\\n","\f":"\\f","\r":"\\r",'"':'\\"',"\\":"\\\\"},$replacechars:function(a){return json.$specialchars[a]||"\\u00"+math.floor(a.charcodeat()/16).tostring(16)+(a.charcodeat()%16).tostring(16); },encode:function(b){switch($type(b)){case"string":return'"'+b.replace(/[\x00-\x1f\\"]/g,json.$replacechars)+'"';case"array":return"["+string(b.map(json.encode).clean())+"]"; case"object":case"hash":var a=[];hash.each(b,function(e,d...
...And 2 more matches

Mozilla Application Framework in Detail - Archive of obsolete content
what this means to you as the developer is this: you can take advantage of skills you already have with xml or web technologies to design and implement anything from a simple text editor to a comprehensive ide - complete with all of the interface widgets that you would find in virtually any major application framework.
...in addition, if the organization maintains sophisticated, interactive websites, it will already possess a wealth of technical expertise that will be relevant for creating xul applications.
... in addition to the technologies already mentioned, we go even further by allowing you to even create your own custom interface widgets.
...And 2 more matches

Mozilla release FAQ - Archive of obsolete content
originally, the plan was just to re-stabilize the code and release 5.0, but it was decided within the community that the more ambitious changes that were planned for later integration were close to being ready.
...first, you should make sure that mozilla doesn't already have the feature you wish to add.
...assured that it's not already there, you should post to the mozilla usenet groups, asking for help.
...And 2 more matches

Back to the Server: Server-Side JavaScript On The Rise - Archive of obsolete content
it is assumed that you have already downloaded, extracted, and consumed the necessary documentation to get up and running with some basic rhino scripts.
... if you don’t already have it, you’ll need to also download the jdbc driver for mysql, extract the class files, and include the path in your classpath environment variable.
...however, taking advantage of frameworks such as aptana jaxer (spidermonkey) and helma (rhino) can reveal even greater rewards as a great deal of work has already been done for you.
...And 2 more matches

RDF in Mozilla FAQ - Archive of obsolete content
var remote = ds.queryinterface(components.interfaces.nsirdfremotedatasource); if (remote.loaded) { alert("the datasource was already loaded!"); } else { alert("the datasource wasn't loaded, but it's loading now!"); } say the datasource wasn't loaded, and is loading asynchronously.
...var remote = ds.queryinterface(components.interfaces.nsirdfremotedatasource); if (remote.loaded) { alert("the datasource was already loaded!"); } else { alert("the datasource wasn't loaded, but it's loading now!"); // rdf/xml datasources are all nsirdfxmlsinks var sink = ds.queryinterface(components.interfaces.nsirdfxmlsink); // attach the observer to the datasource-as-sink sink.addxmlsinkobserver(observer); // now observer's methods will be called-back as // the load progresses.
...you can "make a resource into a container" if it isn't one already using makeseq(), makebag(), or makealt().
...And 2 more matches

Desktop gamepad controls - Game development
api status, browser and hardware support the gamepad api is still in working draft status, although browser support is already quite good — around 63% global coverage, according to caniuse.com.
... pressed buttons we will need a function that will do exactly that on every frame: function gamepadupdatehandler() { buttonspressed = []; if(controller.buttons) { for(var b=0; b<controller.buttons.length; b++) { if(controller.buttons[b].pressed) { buttonspressed.push(b); } } } } we first reset the buttonspressed array to get it ready to store the latest info we'll write to it from the current frame.
...if we want to check the button is not held already (so it's a new press), then looping through the cached states from the previous frame does the job — if the button was already pressed, then we ignore the new press and set it to false.
...And 2 more matches

Drawing graphics - Learn web development
so that's it — our canvas is now primed and ready for drawing on!
... update the variables that describe the sequence of triangles, so we can be ready to draw the next one.
...the next time the browser is ready to update the screen, your function will get called.
...And 2 more matches

A first splash into JavaScript - Learn web development
if you haven't already done so, save your code, refresh the page in your browser, and open the developer tools javascript console.
... the last three lines in the function (lines 26–28 above) get us ready for the next guess to be submitted.
... we add 1 to the guesscount variable so the player uses up their turn (++ is an incrementation operation — increment by 1), and empty the value out of the form text field and focus it again, ready for the next guess to be entered.
...And 2 more matches

Getting started with Ember - Learn web development
previous overview: client-side javascript frameworks next in our first ember article we will look at how ember works and what it's useful for, install the ember toolchain locally, create a sample app, and then do some initial setup to get it ready for development.
...go here to find out how to install node and npm, if you haven't already got them.
...(good suggestions are your "desktop" or "documents" directories, so that it is easy to find): ember new todomvc or, on windows: npx ember-cli new todomvc this generates a production-ready application development environment that includes the following features by default: development server with live reload.
...And 2 more matches

Starting our Svelte Todo list app - Learn web development
in this article we will first have a look at the desired functionality of our app, then we'll create a todos.svelte component and put static markup and styles in place, leaving everything ready to start developing our to-do list app features, which we'll go on to in subsequent articles.
... code along with us git clone the github repo (if you haven't already done it) with: git clone https://github.com/opensas/mdn-svelte-tutorial.git then to get to the current app state, run cd mdn-svelte-tutorial/02-starting-our-todo-app or directly download the folder's content: npx degit opensas/mdn-svelte-tutorial/02-starting-our-todo-app remember to run npm install && npm run dev to start your app in development mode.
... repl to code along with us using the repl, start at https://svelte.dev/repl/b7b831ea3a354d3789cefbc31e2ca495?version=3.23.2 todo list app features this is how our todo list app wil look like once it's ready: using this ui our user will be able to: browse their tasks.
...And 2 more matches

Dynamic behavior in Svelte: working with variables and props - Learn web development
previous overview: client-side javascript frameworks next now that we have our markup and styles ready we can start developing the required features for our svelte to-do list app.
... code along with us git clone the github repo (if you haven't already done it) with: git clone https://github.com/opensas/mdn-svelte-tutorial.git then to get to the current app state, run cd mdn-svelte-tutorial/03-adding-dynamic-behavior or directly download the folder's content: npx degit opensas/mdn-svelte-tutorial/03-adding-dynamic-behavior remember to run npm install && npm run dev to start your app in development mode.
... we've turned our static markup into a dynamic template ready to display the tasks from our component's state.
...And 2 more matches

Mozilla accessibility architecture
we use the accessibility cache to retrieve accessibles that have already been created for a given dom node.
...these crashes occur when the assistive techology releases after some gecko modules have already been unloaded, when the necessary destructors no longer exist in memory.
...the member variables keeping track of the number of children, parent, first child and next sibling allow us to have instant traversal around accessible nodes that have already been visited.
...And 2 more matches

Multiprocess on Windows
as you should already know from the prerequisite reading, single threaded apartments receive remote procedure calls (rpcs) from com, via the windows message queue.
...since we are using com, we already generate metadata by declaring interfaces using midl.
...any typelibs that are already registered in the system registry will automatically be available for use by the interceptor.
...And 2 more matches

HTML parser threading
this method returns immediately if another invocation of it is already on the call stack (nested event loop case).
...(only the already executed ops are destructed and the rest are left in the queue.) the last op in the queue may be an op for attempting to execute a script that may block the parser (ops for attempting to execute async and defer scripts are normal tree ops and don't need to be the last op in a queue).
...it is possible that the parser thread ends up parsing all remaining data into speculations before the main thread is ready to receive more tree ops.
...And 2 more matches

IPDL Tutorial
the following ipdl code defines a very basic interaction of browser and plugin actors: async protocol pplugin { child: async init(nscstring pluginpath); async shutdown(); parent: async ready(); }; this code declares the pplugin protocol.
...one message can be sent from the child to the parent, ready().
...each incoming message is a pure-virtual c++ method which must be implemented: class ppluginparent { public: bool sendinit(const nscstring& pluginpath) { // generated code to send an init() message } bool sendshutdown() { // generated code to send a shutdown() message } protected: /** * a subclass of ppluginparent must implement this method to handle the ready() message.
...And 2 more matches

CustomizableUI.jsm
anode is the widget's node, acontainer is the area it was moved into (nb: it might already have been there and been moved to a different position!) onwidgetundomove(anode, acontainer) fired after undoing a reset to default placements moves a widget's node to a different location.
... anode is the widget's node, acontainer is the area it was moved into (nb: it might already have been there and been moved to a different position!) onareareset(aarea, acontainer) fired after a reset to default placements is complete on an area's dom node.
... if the widget is not in any area, or if the widget is already at the indicated position, this will no-op.
...And 2 more matches

Deferred
if the associated promise has already been resolved, either to a value, a rejection, or another promise, this method does nothing.
... note: calling this method with a pending promise as the avalue argument, and then calling it again with another value before the promise is resolved or rejected, will have no effect the second time, as the associated promise is already resolved to the pending promise value as its resolution.
...if the promise has already been resolved, either to a value, a rejection, or another promise, this method does nothing.
...And 2 more matches

Promise
you don't need to import the promise.jsm module to use a promise object to which you already have a reference.
...if the associated promise has already been resolved, either to a value, a rejection, or another promise, this method does nothing.
... note: calling this method with a pending promise as the avalue argument, and then calling it again with another value before the promise is fulfilled or rejected, will have no effect the second time, as the associated promise is already resolved to the pending promise.
...And 2 more matches

NSPR Error Handling
pr_is_connected_error an attempt to connect on an already connected network file descriptor.
... pr_socket_address_is_bound_erro attempt to bind an address to a tcp file descriptor that is already bound.
... pr_file_is_locked_error an attempt to acquire a lock on a file has failed because the file is already locked.
...And 2 more matches

Index
137 jsobjectops.getrequiredslot jsapi reference, obsolete, spidermonkey get and set a required slot, one that should already have been allocated.
... 190 js_alreadyhasownproperty jsapi reference, spidermonkey these functions attempt to determine whether a property already exists on a specific jsobject without modifying the object.
...this will not recurse through non-extensible objects, on the assumption that those are already deep-frozen.
...And 2 more matches

Observer Notifications
xpcom-shutdown-threads shuts down the thread manager, causing all nsthreads to finish processing any events already queued and stop accepting new events.
... the window id can be obtained from subject.queryinterface(components.interfaces.nsisupportspruint64).data toplevel-window-ready nsiwindowwatcher called just after a new top level window has been opened and is ready, but has not yet loaded a document.
... topic data description highlighter-ready - sent when the highlighter component is initialized.
...And 2 more matches

mozIStorageConnection
resshandler(); void rollbacktransaction(); void setgrowthincrement(in print32 aincrement, in autf8string adatabasename); mozistorageprogresshandler setprogresshandler(in print32 agranularity, in mozistorageprogresshandler ahandler); boolean tableexists(in autf8string atablename); attributes attribute type description connectionready boolean indicates if the connection is open and ready to use.
...this should not be used until the database is ready.
... note: the database engine does not support nested transactions, so attempting to start a transaction when one is already active will throw an exception.
...And 2 more matches

mozIStorageService
if the filename is already taken, attempts will be made to ensure that it is unique.
...the specified file is created if it does not already exist.
...consumers should check mozistorageconnection.connectionready to ensure that they can use the database.
...And 2 more matches

nsIWindowsRegKey
if the key is already closed, then this method does nothing.
...the value will be created if it does not already exist.
...the value will be created if it does not already exist.
...And 2 more matches

Content Index API - Web APIs
the content index api is an extension to service workers, which allows developers to add urls and metadata of already cached pages, under the scope of the current service worker.
... // reference registration const registration = await navigator.serviceworker.ready; // feature detection if ('index' in registration) { // content index api functionality const contentindex = registration.index; } adding to the content index here we're declaring an item in the correct format and creating an asynchronous function which uses the add() method to register it with the content index.
...amet.html', title: 'amet consectetur adipisicing', description: 'repellat et quia iste possimus ducimus aliquid a aut eaque nostrum.', icons: [{ src: '/media/dark.png', sizes: '128x128', type: 'image/png', }], category: 'article' }; // our asynchronous function to add indexed content async function registercontent(data) { const registration = await navigator.serviceworker.ready; // feature detect content index if (!registration.index) { return; } // register content try { await registration.index.add(data); } catch (e) { console.log('failed to register content: ', e.message); } } retrieving items within the current index the below example shows an asynchronous function that retrieves items within the content index and iterates over each entry, b...
...And 2 more matches

Rendering and the WebXR frame animation callback - Web APIs
refresh rate and frame rate assuming you've called the xrsession method requestanimationframe() since the last time the screen refreshed, the browser will call your frame renderer callback every time it's ready to repaint your app or site window.
... hardare vertical refresh rate when the browser is ready to refresh the <canvas> within which your webxr content is displayed, it calls your frame rendering callback, which uses the specified timestamp and any other relevant data, such as models and textures, as well as application state, to render the scene—as it should appear at the specified time—into the webgl backbuffer.
...60 fps is already beyond the point at which most people can easily detect that the animation isn't simply a series of still images going by really fast.
...And 2 more matches

Using the Web Animations API - Web APIs
to prevent the cake from eating itself up before the user has had the chance to click on it, we call animation.pause() on it immediately after it is defined, like so: nommingcake.pause(); we can now use the animation.play() method to run it whenever we’re ready: nommingcake.play(); specifically, we want to link it to alice’s animation, so she gets bigger as the cupcake gets eaten.
...then we pause her: alicechange.pause(); if we had left her paused at the beginning of her animation, she’d start at half her full size, as if she’d drunk the entire bottle already!
... we want to set her animation’s “playhead” in the middle, so she’s already halfway done.
...And 2 more matches

WritableStream - Web APIs
const list = document.queryselector('ul'); function sendmessage(message, writablestream) { // defaultwriter is of type writablestreamdefaultwriter const defaultwriter = writablestream.getwriter(); const encoder = new textencoder(); const encoded = encoder.encode(message, { stream: true }); encoded.foreach((chunk) => { defaultwriter.ready .then(() => { return defaultwriter.write(chunk); }) .then(() => { console.log("chunk written to sink."); }) .catch((err) => { console.log("chunk error:", err); }); }); // call ready again to ensure that all chunks are written // before closing the writer.
... defaultwriter.ready .then(() => { defaultwriter.close(); }) .then(() => { console.log("all chunks written"); }) .catch((err) => { console.log("stream error:", err); }); } const decoder = new textdecoder("utf-8"); const queuingstrategy = new countqueuingstrategy({ highwatermark: 1 }); let result = ""; const writablestream = new writablestream({ // implement the sink write(chunk) { return new promise((resolve, reject) => { var buffer = new arraybuffer(2); var view = new uint16array(buffer); view[0] = chunk; var decoded = decoder.decode(view, { stream: true }); var listitem = document.createelement('li'); listitem.textcontent = "chunk decoded: " + decoded; list.appendchild(listitem); result += dec...
... the defaultwriter.ready property returns a promise that resolves when the sink (the first property of the writablestream constructor) is done writing data.
...And 2 more matches

Writing Web Audio API code that works in every browser - Developer guides
you probably have already read the announcement on the web audio api coming to firefox, and are totally excited and ready to make your until-now-webkit-only sites work with firefox, which uses the unprefixed version of the spec.
...in addition, not all features of web audio are already implemented in firefox yet.
...and it won't do anything if the unprefixed versions are already present.
...And 2 more matches

Using the application cache - HTML: Hypertext Markup Language
since the document has already been loaded into the browser from the cache, the updated document will not be rendered until the document is reloaded (either manually or programatically).
... updateready there is a new version of the application cache available.
... there is a corresponding updateready event, which is fired instead of the cached event when a new update has been downloaded but not yet activated using the swapcache() method.
...And 2 more matches

Content Scripts - Archive of obsolete content
you can load multiple scripts by passing an array of strings to either contentscript or contentscriptfile: // main.js var tabs = require("sdk/tabs"); tabs.on('ready', function(tab) { tab.attach({ contentscript: ['document.body.style.border = "5px solid red";', 'window.alert("hi");'] }); }); // main.js var data = require("sdk/self").data; var pagemod = require("sdk/page-mod"); pagemod.pagemod({ include: "*.mozilla.org", contentscriptfile: [data.url("jquery.min.js"), data.url("my-content-script.js")] }); if you do this, the scripts can inter...
... "ready": load the scripts after the dom for the page has been loaded: that is, at the point the domcontentloaded event fires.
... passing configuration options the contentscriptoptions is a json object that is exposed to content scripts as a read-only value under the self.options property: // main.js var tabs = require("sdk/tabs"); tabs.on('ready', function(tab) { tab.attach({ contentscript: 'window.alert(self.options.message);', contentscriptoptions: {"message" : "hello world"} }); }); any kind of jsonable value (object, array, string, etc.) can be used here.
... here's a simple add-on that sends a message to a content script using port: // main.js var tabs = require("sdk/tabs"); var self = require("sdk/self"); tabs.on("ready", function(tab) { var worker = tab.attach({ contentscriptfile: self.data.url("content-script.js") }); worker.port.emit("alert", "message from the add-on"); }); tabs.open("http://www.mozilla.org"); // content-script.js self.port.on("alert", function(message) { window.alert(message); }); the context-menu module doesn't use the communication model described here.

page-worker - Archive of obsolete content
e page to the add-on: var script = "var elements = document.queryselectorall('h2 > span'); " + "for (var i = 0; i < elements.length; i++) { " + " postmessage(elements[i].textcontent) " + "}"; // create a page worker that loads wikipedia: pageworkers.page({ contenturl: "http://en.wikipedia.org/wiki/internet", contentscript: script, contentscriptwhen: "ready", onmessage: function(message) { console.log(message); } }); for conciseness, this example creates the content script as a string and uses the contentscript property.
... scripting trusted page content we've already seen that you can package html files in your add-on's data directory and load them using page-worker.
...this may take one of the following values: "start": load content scripts immediately after the document element for the page is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) for the page has been loaded, at the time the window.onload event fires this property is optional and defaults to "end".
...this may have one of the following values: "start": load content scripts immediately after the document element for the page is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) for the page has been loaded, at the time the window.onload event fires contentscriptoptions read-only value exposed to content scripts under self.options property.

panel - Archive of obsolete content
opening a panel will close any panel created by the panel() constructor that is already open, even if that panel was opened by a different add-on sdk based extension.
... we've already seen that you can package html files in your add-on's data directory and use them to define the panel's content.
...this may take one of the following values: "start": load content scripts immediately after the document element for the panel is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) for the panel has been loaded, at the time the window.onload event fires this property is optional and defaults to "end".
...this may have one of the following values: "start": load content scripts immediately after the document element for the panel is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) for the panel has been loaded, at the time the window.onload event fires contentscriptoptions read-only value exposed to content scripts under addon.options property.

frame/hidden-frame - Archive of obsolete content
the following code creates a hidden frame, loads a web page into it, and then logs its title: var hiddenframes = require("sdk/frame/hidden-frame"); let hiddenframe = hiddenframes.add(hiddenframes.hiddenframe({ onready: function() { this.element.contentwindow.location = "http://www.mozilla.org/"; let self = this; this.element.addeventlistener("domcontentloaded", function() { console.log(self.element.contentdocument.title); }, true, true); } })); see the panel module for a real-world example of usage of this module.
... parameters options : object required options: name type onready function,array functions to call when the frame is ready to load content.
... you must specify an onready callback and refrain from using the hidden frame until the callback gets called, because hidden frames are not always ready to load content the moment they are added.
... events ready this event is emitted when the dom for a hidden frame content is ready.

io/text-streams - Archive of obsolete content
it must already be opened.
...it must already be opened.
...if the stream is already closed, an exception is thrown.
...if the stream is already closed, an exception is thrown immediately.

Adding Toolbars and Toolbar Buttons - Archive of obsolete content
this popup is already part of the main window, so it doesn't need to be implemented again.
...we've already mentioned this before, and if you follow our recommendations, then you shouldn't have many problems making your toolbar compatible with the customize toolbars dialog.
... remember to validate if your button is already present, to prevent duplicates.
... it's also a good idea to set a preference that indicates that you added your button already, so that it can be removed permanently if the user chooses to.

Setting up an extension development environment - Archive of obsolete content
as we are specifically defining the user profile dev, if you don't have the dev profile already created, the profile selection window opens, where you can create it.
... in the following example, the described command starts a new instance of firefox, with a profile called dev; even if an instance of firefox is already running.
...if you are already running a firefox instance without -no-remote, and you attempt to start another instance with -p profilename (but without the -no-remote parameter), that second invocation would ignore its -p profilename parameter, instead opening a new window for the already running instance; sharing all its profile, sessions etc.
... note: if you already installed the extension via xpi, you should uninstall it first before creating the pointer file.

Search Extension Tutorial (Draft) - Archive of obsolete content
// an engine with this name must already exist.
... selectsearch = firstrun || reason == addon_enable; // only add the engine if it doesn't already exist.
...var selectsearch = false; function removeobserver() { try { services.obs.removeobserver(searchobserver, engine_added); } // if we've already removed this observer, ignore the error.
... selectsearch = firstrun || reason == addon_enable; // only add the engine if it doesn't already exist.

Space Manager Detailed Design - Archive of obsolete content
must not be null * @param aunavailablespace the bounding rect of the unavailable space * @return ns_ok if successful * ns_error_failure if there is already a region tagged with aframe */ nsresult addrectregion(nsiframe* aframe, const nsrect& aunavailablespace); /** * resize the rectangular region associated with aframe by the specified * deltas.
...must not be null * @param aunavailablespace the bounding rect of the unavailable space * @return ns_ok if successful * ns_error_failure if there is already a region tagged with aframe */ nsresult addrectregion(nsiframe* aframe, const nsrect& aunavailablespace); /** * resize the rectangular region associated with aframe by the specified * deltas.
...if it is found, return an error since the frame is already associated with a region in the spacemanager.
...insert the part that is totally above the bandrect before the current bandrect, as in case #1 above, and adjust the other band rect to exclude the part already added.

Binding Attachment and Detachment - Archive of obsolete content
when a binding is attached using the dom, it inherits from the current most derived binding that may already be attached to the element.
... if a binding is attached and it already specifies an inherited binding using the extends attribute, then the base binding at the end of the inheritance chain is the one that will inherit from the most derived binding that is already attached.
... for example, given a binding d1, with an explicit inheritance chain of d1 -> d2 -> d3 if this element is attached to an element using element.style.mozbinding that already has a binding chain of s1 -> s2 -> s3 the resulting binding chain following the addition of the binding is d1 -> d2 -> d3 -> s1 -> s2 -> s3 the inheritance between d3 and s1 is implicit, meaning that there is no connection in the xbl documents between the two bindings.
...therefore if all the bindings in a chain come from binding documents that have already been loaded by the bound document, then the attachment of a binding (either through css or through the dom) is guaranteed to be synchronous.

listbox - Archive of obsolete content
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.
...refix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata additemtoselection( item ) return type: no return value selects the given item, without deselecting any other items that are already selected.
...if the item is already visible, no scrolling occurs.
...if the item is already visible, no scrolling occurs.

NPN_RequestRead - Archive of obsolete content
this initiates a read operation; the actual data is received through subsequent calls to npp_writeready() and npp_write().
...these requests result in subsequent calls to npp_writeready() and npp_write().
...if the plug-in requests multiple ranges (either through a list of npbyterange objects in a single call to npn_requestread(), or multiple calls to npn_requestread()), the browser can write individual ranges in any order, and with any number of npp_writeready() and npp_write() calls.
...see also npp_newstream() npp_writeready() npp_write() npstream ...

Using SSH to connect to CVS - Archive of obsolete content
this document assumes that you already have a write-access cvs account to cvs.mozilla.org.
...most linux, bsd, and osx distributions come with it installed already.
... setting up cvs to use ssh in your system's environment, make sure thatcvs_rsh is set to whatever your ssh binary is called; a full path is not necessary if ssh is already in your path.
...if you don't already run ssh-agent on your computer, it's probably easiest to start it up whenever you set up your environment to checkout and build mozilla.

Index - Game development
16 building up a basic demo with a-frame 3d, a-frame, vr, virtual reality, web, webgl the webxr and webgl apis already enable us to start creating virtual reality (vr) experiences inside web browsers, but the community is still waiting for tools and libraries to appear, to make this easier.
... 62 collision detection beginner, canvas, games, javascript, tutorial, collision, detection we have the bricks appearing on the screen already, but the game still isn't that interesting as the ball goes through them.
...we have already added keyboard controls, but we could easily add mouse controls too.
... 67 move the ball 2d, beginner, canvas, games, javascript, loop, tutorial, movement you already know how to draw a ball from working through the previous article, so now let's make it move.

Building up a basic demo with Babylon.js - Game development
if you have already worked through our building up a basic demo series with three.js, playcanvas or a-frame (or you are familiar with other 3d libraries) you'll notice that babylon.js works on similar concepts: camera, light and objects.
...there is one helper variable already included, which will store a reference to the <canvas> element.
... more shapes we have a box on the scene already; now let's try adding more shapes.
... animation we already used position and rotation to adjust the position of the shapes; we could also scale them.

Building up a basic demo with Three.js - Game development
there are two helper variables already included, which store the window's width and height.
... rendering the scene everything is ready, but we still can't see anything.
... our material is now ready, what next?
... animation we already used rotation, to adjust the position of the cube.

Index - MDN Web Docs Glossary: Definitions of Web-related terms
with variables, on the other hand, the programmer can assign a new value to a variable name already in use.
...for example, the selector a:visited applies styles only to links that the user has already followed.
... 416 shim codingscripting, glossary a shim is a piece of code used to correct the behavior of code that already exists, usually by adding new api that works around the problem.
...the upside is that when a speculation succeeds, there's no need to reparse the part of the incoming file that was already scanned for scripts, style sheets and images.

Accessible multimedia - Learn web development
simple images we already covered simple text alternatives for html images in our html: a good basis for accessibility article — you can refer back to there for the full details.
...in some cases it is not so bad, for example: if you are embedding audio content using a plugin technology like flash or silverlight, you can probably just provide an audio transcript in the same manner as we already showed above in the transcript examples section.
... we've not written a new set of assessments for this article, because there are already assessments available in our html multimedia and embedding module that test your knowledge of the information presented here.
... if you haven't already, go and try out the assessments at test your skills: html images and test your skills: multimedia and embedding.

What software do I need to build a website? - Learn web development
prerequisites: you should already know the difference between webpages, websites, web servers, and search engines.
... (all unix) gedit (gnome) kate (kde) leafpad (xfce) emacs vim visual studio code brackets shiftedit sublime text chrome os shiftedit here is a screenshot of an advanced text editor: here is a screenshot of an online text editor: uploading files on the web when your website is ready for public viewing, you'll have to upload your webpages to your web server.
...c (s)ftp clients: operating system ftp software windows winscp moba xterm filezilla (all os) linux nautilus/files (gnome) dolphin (kde) mac os cyberduck chrome os shiftedit (all os) browsing websites as you already know, you need a web browser to view websites.
...(if you're going that route, microsoft has some tools for developers including a ready-to-use virtual machine at modern.ie.) by all means run some tests on a real device, especially on real mobile devices.

How to build custom form controls - Learn web development
we didn't implement this in our example, but it would be easy to do so, as the mechanism has already been implemented for the click event.
... .select .option { padding: .2em .3em; /* 2px 3px */ } .select .highlight { background: #000; color: #ffffff; } so here's the result with our three states: basic state active state open state check out the source code bringing your control to life with javascript now that our design and structure are ready, we can write the javascript code to make the control actually work.
... // and we deactivate the custom control itself select.classlist.remove('active'); } // this function will be used each time the user wants to (de)activate the control // it takes two parameters: // select : the dom node with the `select` class to activate // selectlist : the list of all the dom nodes with the `select` class function activeselect(select, selectlist) { // if the control is already active there is nothing to do if (select.classlist.contains('active')) return; // we have to turn off the active state on all custom controls // because the deactivateselect function fulfills all the requirements of the // foreach callback function, we use it directly without using an intermediate // anonymous function.
... as seen previously, we already use a native select control as a fallback for accessibility reasons; we can simply synchronize its value with that of our custom control: // this function updates the displayed value and synchronizes it with the native control.

Test your skills: Advanced styling - Learn web development
we've already provided you with a basic reset to build upon.
... we've already provided you with a basic reset to build upon.
... advanced form styling 3 in our final task for this assessment series, we provide you with a feedback form that is already nicely-styled — you've already seen something similar if you've worked through our ui pseudo-classes article, and now we want you to come up with your own solution.
... details of what you have already tried, and what you would like us to do, e.g.

Graceful asynchronous programming with Promises - Learn web development
even if the handlecallbutton() function has already returned to the code that called it, when getusermedia() has finished working, it calls the handler you provide.
...pings) { return placeorder(toppings); }) .then(function(order) { return collectorder(order); }) .then(function(pizza) { eatpizza(pizza); }) .catch(failurecallback); this is much better — it is easier to see what is going on, we only need a single .catch() block to handle all the errors, it doesn't block the main thread (so we can keep playing video games while we wait for the pizza to be ready to collect), and each operation is guaranteed to wait for previous operations to complete before running.
... building your own custom promises the good news is that, in a way, you've already built your own promises.
... when you've chained multiple promises together with .then() blocks, or otherwise combined them to create custom functionality, you are already making your own custom async promise-based functions.

Image gallery - Learn web development
prerequisites: before attempting this assessment you should have already worked through all the articles in this module.
... looping through the images we've already provided you with lines that store a reference to the thumb-bar <div> inside a constant called thumbbar, create a new <img> element, set its src attribute to a placeholder value xxx, and append this new <img> element inside thumbbar.
... writing a handler that runs the darken/lighten button that just leaves our darken/lighten <button> — we've already provided a line that stores a reference to the <button> in a constant called btn.
... details of what you have already tried, and what you would like us to do, e.g.

Introduction to web APIs - Learn web development
note: if you are not already familiar with how objects work, you should go back and work through our javascript objects module before continuing.
... they use events to handle changes in state we already discussed events earlier on in the course in our introduction to events article, which looks in detail at what client-side web events are and how they are used in your code.
... if you are not already familiar with how client-side web api events work, you should go and read this article first before continuing.
... we already saw a number of event handlers in use in our web audio api example above.

Third-party APIs - Learn web development
if you've already cloned the examples repository, you'll already have a copy of this file, which you can find in the javascript/apis/third-party-apis/mapquest directory.
...if you've already cloned the examples repository, you'll already have a copy of these files, which you can find in the javascript/apis/third-party-apis/nytimes directory.
... the second function works nearly exactly the same way in reverse, but we also have to take the extra step of checking that pagenumber is not already zero before decrementing it — if the fetch request runs with a minus page url parameter, it could cause errors.
... if the pagenumber is already 0, we simply return out of the function, to avoid wasting processing power (if we are already at the first page, we don't need to load the same results again).

Deployment and next steps - Learn web development
code along with us git clone the github repo (if you haven't already done it) with: git clone https://github.com/opensas/mdn-svelte-tutorial.git then to get to the current app state, run cd mdn-svelte-tutorial/08-next-steps or directly download the folder's content: npx degit opensas/mdn-svelte-tutorial/08-next-steps remember to run npm install && npm run dev to start your app in development mode.
...if you haven't already done it, make sure you go through the svelte interactive tutorial.
... we already covered most of its content, so it won't take you much time to complete it — you should consider it as practise!
... if you prefer to read books, there's svelte and sapper in action by mark volkman, expected to be published in september 2020, but which you can already preview online for free.

Advanced Svelte: Reactivity, lifecycle, accessibility - Learn web development
code along with us git clone the github repo (if you haven't already done it) with: git clone https://github.com/opensas/mdn-svelte-tutorial.git then to get to the current app state, run cd mdn-svelte-tutorial/05-advanced-concepts or directly download the folder's content: npx degit opensas/mdn-svelte-tutorial/05-advanced-concepts remember to run npm install && npm run dev to start your app in development mode.
... like we already saw, we could just tell svelte to update the variable with a self-assignment, like this: const checkalltodos = (completed) => { todos.foreach(t => t.completed = completed) todos = todos } this will solve the problem.
... so, how can you know when the component has already been created and mounted on the dom?
... we've already seen that svelte uses export let var = ...

Handling common accessibility problems - Learn web development
we've already talked about other spheres such as responsive design and performance in other places in the module.
...we have already mentioned a couple of accessibility tips involving css: use the correct semantic elements to mark up different content in html; if you want to create a different visual effect, use css — don't abuse an html element to get the look you want.
...we've already hinted at some accessibility problems related to javascript, mainly in the area of semantic html — you should always use appropriate semantic html to implement functionality wherever it is available, for example use links and buttons as appropriate.
... nvda + space (when form is selected) enter form so individual items can be selected, or leave form if you are already in it.

Handling common HTML and CSS problems - Learn web development
for example, you might use a css framework and find that one of the class names it uses clashes with one you've already used for a different purpose.
... or you might find that html generated by some kind of third party api (generating ad banners, for example) includes a class name or id that you are already using for a different purpose.
...to show you an example of how such plugins generally work: install atom (if you haven't got an up-to-date version already installed) — download it from the atom page linked above.
...you are advised to look and see if there is an answer to your question already, before posting a new question.

Introduction to cross browser testing - Learn web development
before you even get to cross browser issues, you should have already fixed out bugs in your code (see debugging html, debugging css, and what went wrong?
...the client might already have data about this from previous research they've done, e.g.
...it might have already been fixed — for example if a bug is present in firefox release 49, but it is no longer there in firefox nightly (version 52), then they have fixed it.
...armed with this knowledge, you are now ready to move on and start learning about cross browser testing strategies.

Deploying our app - Learn web development
instead of running the server with npx parcel src/index.html, we can run it with npx parcel build src/index.html and parcel will build everything ready for production instead of just running it for development and testing purposes.
... the newly-created production code is placed in a new directory called dist, which contains all the files required to run the website, ready for you to upload to a server.
... "build": "parcel build src/index.html" } note: if the scripts property already has a command inside it, put a comma at the end of it.
... now we're ready to push our code to github; run the following command now: git push github master at this point you'll be prompted to enter a username and password before git will allow the push to be sent.

Client-side tooling overview - Learn web development
you might even find yourself writing a piece of software to aid your own development process, to solve a specific problem that existing tools don’t already seem to handle.
... bundlers/packagers these are tools that get your code ready for production, for example by “tree-shaking” to make sure only the parts of your code libraries that you are actually using are put into your final production code, or "minifying" to remove all the whitespace in your production code, making it as small as possible before it is uploaded to a server.
...the knowledge about which are the best tools to use is a bit tribal, meaning that if you aren’t already in the web community, it is hard to find out exactly which ones to go for!
...general web searches for front-end developer tools are generally useless unless you already know the name of the tool you are searching for.

Command line options
firefox -createprofile "joeluser c:\internet\joelusers-moz-profile" note: profile_dir must not exist and you must not already have a profile called profile_name.
...if a private browsing window is already open, a new tab is opened in the existing window.
... execute the specified remote_command in an already running application process.
...useful with those command-line arguments that open their own windows but don't already prevent default windows from opening.

The Firefox codebase: CSS Guidelines
before adding more css it is good practice to check if the css that is being written is needed, it can be the case that a common component has been already written could be reused with or without changes.
... most of the time, the common component already follows the a11y/theme standards defined in this guide.
... colors for common areas of the firefox interface (panels, toolbar buttons, etc.), mozilla-central often comes with some useful css variables that are adjusted with the correct values for different platform configurations, so using those css variables can definitively save some testing time, as you can assume they already work correctly.
... using the currentcolor keyword or inheriting is also good practice, because sometimes the needed value is already in the color or on the parent element.

Eclipse CDT
(if you're thinking of adding tips, please first consider how widely useful they'll be before adding to this already lengthy page.) for further documentation see the official eclipse user guide and eclipse cdt user guide.
...;-) to jump to the definition of a symbol (or the declaration of a symbol if already at the definition), hover over the symbol, hold down the ctrl/cmd key, move the mouse slightly to linkify the symbol, then click on it.
...if you think we need our own documentation on mercurialeclipse, please consider adding a separate page for that tool since this page is already pretty long.
...if you already carried out the instructions in that section, then double check that your changes to eclipse's memory limits actually took effect and are present in eclipse/help > about eclipse > installation details > configuration.

Eclipse CDT Manual Setup
(this assumes that you already have a copy of the mozilla source, and that you have also built the source so that you have a pre-existing object directory.
...owing two settings in the workspace preferences (window > preferences, or eclipse > preferences) before creating a project in that workspace: in "general > workspace", disable "build automatically" in "c/c++ > indexer", disable "automatically update the index" turning off automatic indexing prevents the cpu intensive indexer from running at various stages during the steps below before we're ready.
...(see the headers are only parsed once section below to understand why this step is important for people who have their object directory outside their source tree.) getting code assistance working you're now ready to get code assistance working.
... :-) build option discovery this section requires that you have already built your mozilla source tree (so that you have an object directory for it), and it is strongly recommended that the object directory is up to date so that the just-print-mozilla-build.py script runs quickly.

AddonManager
state_downloaded an install that has finished downloading and is ready to install.
...fromwebpage( in string mimetype, in nsidomwindow source, in nsiuri uri, in addoninstall installs[] ) parameters mimetype the mimetype of add-ons being installed source the nsidomwindow that started the installs uri the nsiuri that started the installs installs the array of addoninstalls to be installed addinstalllistener() adds a new installlistener if the listener is not already registered.
... addaddonlistener() adds a new addonlistener if the listener is not already registered.
... void removeaddonlistener( in addonlistener listener ) parameters listener the addonlistener to remove addtypelistener() adds a new typelistener if the listener is not already registered.

DeferredTask.jsm
void arm(); disarm cancel any request for a delayed execution of the task, though the task itself cannot be canceled in case it is already running.
...}, 2000); // the task is ready, but will not be executed until requested.
... if the timer is already armed when the "finalize" method is called, then the task is executed immediately.
... if the task was already running at this point, then one last execution from start to finish will happen again, immediately after the current execution terminates.

Initial setup
you also need to determine if a localization effort already exists for your locale.
... here's what you do: look through the existing localization community directory to see if one already exists for your locale.
... if a community already exists, reach out to them and ask how you can help.
... mozilla ldap you will need a mozilla ldap account once you're ready to have your localization registered on the main mozilla repositories.

Python binding for NSS
programmers already familiar with nss/nspr will be quite comfortable with python-nss.
...for example it is already known there are some naming inconsistencies.
...some functionality and interface have already been deprecated due to lessons learned.
... the following other non-ipv6 fixes were also made because they were discovered while doing the ipv6 work: move definition of type_ready to py_nspr_common.h so it can be shared.

JSAPI User Guide
throwing and catching exceptions we have already seen one example of how to throw an exception from a jsnative function.
...or a js object that mirrors data and functions that already exist in the application may provide an object-oriented interface to c code that is not otherwise, strictly-speaking, object-oriented itself.
...upproperty js_lookupucproperty js_getproperty js_getucproperty js_getpropertyattributes js_getucpropertyattributes js_getpropertyattrsgetterandsetter js_getucpropertyattrsgetterandsetter js_setproperty js_setucproperty js_setpropertyattributes js_setucpropertyattributes js_deleteproperty2 js_deleteucproperty2 js_alreadyhasownproperty js_alreadyhasownucproperty unicode javascript source js_compilescript js_compileucscript js_compilescriptforprincipals js_compileucscriptforprincipals js_compilefunction js_compileucfunction js_compilefunctionforprincipals js_compileucfunctionforprincipals js_evaluatescript js_evaluateucscript js_ev...
...conversely, if you want to strip user a's administrator privileges, but you have already given administrator functions to user a's scripts, that's even worse.

ContentIndex - Web APIs
// reference registration const registration = await navigator.serviceworker.ready; // feature detection if ('index' in registration) { // content index api functionality const contentindex = registration.index; } adding to the content index here we're declaring an item in the correct format and creating an asynchronous function which uses the add() method to register it with the content index.
...amet.html', title: 'amet consectetur adipisicing', description: 'repellat et quia iste possimus ducimus aliquid a aut eaque nostrum.', icons: [{ src: '/media/dark.png', sizes: '128x128', type: 'image/png', }], category: 'article' }; // our asynchronous function to add indexed content async function registercontent(data) { const registration = await navigator.serviceworker.ready; // feature detect content index if (!registration.index) { return; } // register content try { await registration.index.add(data); } catch (e) { console.log('failed to register content: ', e.message); } } retrieving items within the current index the below example shows an asynchronous function that retrieves items within the content index and iterates over each entry, b...
... async function createreadinglist() { // access our service worker registration const registration = await navigator.serviceworker.ready; // get our index entries const entries = await registration.index.getall(); // create a containing element const readinglistelem = document.createelement('div'); // test for entries if (!array.length) { // if there are no entries, display a message const message = document.createelement('p'); message.innertext = 'you currently have no articles saved for offline reading.' readinglistelem.append(message); } else { // if entries are present, display in a list of links to the content const listelem = document.createelement('ul'); for (const entry of entries) { const list...
... async function unregistercontent(article) { // reference registration const registration = await navigator.serviceworker.ready; // feature detect content index if (!registration.index) return; // unregister content from index await registration.index.delete(article.id); } all the above methods are available within the scope of the service worker.

Document - Web APIs
document.readystateread only returns loading status of the document.
... document.onreadystatechange represents the event handling code for the readystatechange event.
... readystatechange fired when the readystate attribute of a document has changed.
... also available via the onreadystatechange property.

EventSource - Web APIs
eventsource.readystate read only a number representing the state of the connection.
... eventsource.close() closes the connection, if any, and sets the readystate attribute to closed.
... if the connection is already closed, the method does nothing.
...it, in turn, creates a new <li> element and writes the message's data into it, then appends the new element to the list element already in the document.

FileSystemDirectoryEntry.getDirectory() - Web APIs
options optional an object based on the filesystemflags dictionary, which allows you to specify whether or not to create the entry if it's missing and if it's an error if the file already exists.
... fileerror.path_exists_err the create and exclusive options were both true, indicating that the directory should be created but must not already exist, but the directory does in fact already exist.
...the parent directory must already exist.
... values and results the table below describes the result of each possible combination of these flags depending on whether or not the target file or directory path already exists.

FileSystemDirectoryEntry.getFile() - Web APIs
options optional an object based on the filesystemflags dictionary, which allows you to specify whether or not to create the entry if it's missing and if it's an error if the file already exists.
... fileerror.path_exists_err the create and exclusive options were both true, indicating that the file should be created but must not already exist, but the file does in fact already exist.
...the parent directory must already exist.
... values and results the table below describes the result of each possible combination of these flags depending on whether or not the target file or directory path already exists.

HTMLMediaElement.load() - Web APIs
appropriate events will be sent to the media element itself as the load process proceeds: if the element is already in the process of loading media, that load process is aborted and the abort event is sent.
... if the element has already been initialized with media, the emptied event is sent.
... if resetting the playback position to the beginning of the media actually changes the playback position (that is, it was not already at the beginning), a timeupdate event is sent.
... once media has been selected and loading is ready to begin, the loadstart event is delivered.

Headers.append() - Web APIs
the append() method of the headers interface appends a new value onto an existing header inside a headers object, or adds the header if it does not already exist.
... the difference between set() and append() is that if the specified header already exists and accepts multiple values, set() will overwrite the existing value with the new one, whereas append() will append the new value onto the end of the set of values.
... example creating an empty headers object is simple: var myheaders = new headers(); // currently empty you could add a header to this using append(): myheaders.append('content-type', 'image/jpeg'); myheaders.get('content-type'); // returns 'image/jpeg' if the specified header already exists, append() will change its value to the specified value.
... if the specified header already exists and accepts multiple values, append() will append the new value to the end of the value set: myheaders.append('accept-encoding', 'deflate'); myheaders.append('accept-encoding', 'gzip'); myheaders.get('accept-encoding'); // returns 'deflate, gzip' to overwrite the old value with a new one, use headers.set.

Headers.set() - Web APIs
the set() method of the headers interface sets a new value for an existing header inside a headers object, or adds the header if it does not already exist.
... the difference between set() and headers.append is that if the specified header already exists and accepts multiple values, set() overwrites the existing value with the new one, whereas headers.append appends the new value to the end of the set of values.
... example creating an empty headers object is simple: var myheaders = new headers(); // currently empty you could add a header to this using headers.append, then set a new value for this header using set(): myheaders.append('content-type', 'image/jpeg'); myheaders.set('content-type', 'text/html'); if the specified header does not already exist, set() will create it and set its value to the specified value.
... if the specified header does already exist and does accept multiple values, set() will overwrite the existing value with the new one: myheaders.set('accept-encoding', 'deflate'); myheaders.set('accept-encoding', 'gzip'); myheaders.get('accept-encoding'); // returns 'gzip' you'd need headers.append to append the new value onto the values, not overwrite it.

MediaSource.addSourceBuffer() - Web APIs
invalidstateerror the mediasource is not in the "open" readystate.
... notsupportederror the specified mimetype isn't supported by the user agent, or is not compatible with the mime types of other sourcebuffer objects that are already included in the media source's sourcebuffers list.
...ew the full demo live, or download the source for further investigation.) var asseturl = 'frag_bunny.mp4'; // need to be specific for blink regarding codecs // ./mp4info frag_bunny.mp4 | grep codec var mimecodec = 'video/mp4; codecs="avc1.42e01e, mp4a.40.2"'; if ('mediasource' in window && mediasource.istypesupported(mimecodec)) { var mediasource = new mediasource; //console.log(mediasource.readystate); // closed video.src = url.createobjecturl(mediasource); mediasource.addeventlistener('sourceopen', sourceopen); } else { console.error('unsupported mime type or codec: ', mimecodec); } function sourceopen (_) { //console.log(this.readystate); // open var mediasource = this; var sourcebuffer = mediasource.addsourcebuffer(mimecodec); fetchab(asseturl, function (buf) { sour...
...cebuffer.addeventlistener('updateend', function (_) { mediasource.endofstream(); video.play(); //console.log(mediasource.readystate); // ended }); sourcebuffer.appendbuffer(buf); }); }; specifications specification status comment media source extensionsthe definition of 'addsourcebuffer()' in that specification.

PerformanceTiming - Web APIs
performancetiming.fetchstart read only when the browser is ready to fetch the document using an http request.
... performancetiming.domloading read only when the parser started its work, that is when its document.readystate changes to 'loading' and the corresponding readystatechange event is thrown.
... performancetiming.dominteractive read only when the parser finished its work on the main document, that is when its document.readystate changes to 'interactive' and the corresponding readystatechange event is thrown.
... performancetiming.domcomplete read only when the parser finished its work on the main document, that is when its document.readystate changes to 'complete' and the corresponding readystatechange event is thrown.

RTCPeerConnection - Web APIs
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 finishe...
...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.getdefaulticeservers() the getdefaulticeservers() method of the rtcpeerconnection interface returns an array of objects based on the rtciceserver dictionary, which indicates what, if any, ice servers the browser will use by default if none are provided to the rtcpeerconnection in its rtcconfiguration.
...the answer contains information about any media already attached to the session, codecs and options supported by the browser, and any ice candidates already gathered.
...if the negotiation already happened, a new one will be needed for the remote peer to be able to use it.

Streams API concepts - Web APIs
the chunks placed in a stream are said to be enqueued — this means they are waiting in a queue ready to be read.
... you can make use of ready-made readable streams via mechanisms like a response.body from a fetch request, or roll your own streams using the readablestream() constructor.
...you can use whatever code you like to produce the chunks ready for writing; the writer plus the associated code is called a producer.
...when a stream later in the chain is still busy and isn't yet ready to accept more chunks, it sends a signal backwards through the chain to tell earlier transform streams (or the original source) to slow down delivery as appropriate so that you don't end up with a bottleneck anywhere.

Establishing a connection: The WebRTC perfect negotiation pattern - Web APIs
if we already have video coming in from the remote peer (which we can see if the remote view's <video> element's srcobject property already has a value), we do nothing.
...since a peer can only accept offers when in the stable state, the peer has thus rescinded its offer and is ready to receive the offer from the remote (impolite) peer.
...ch(err) { if (!ignoreoffer) { throw err; } } } } catch(err) { console.error(err); } }; since rollback works by postponing changes until the next negotiation (which will begin immediately after the current one is finished), the polite peer needs to know when it needs to throw away a received offer if it's currently waiting for a reply to an offer it's already sent.
...if the received message is an offer and the local peer is the impolite peer, and a collision is occurring, we ignore the offer because we want to continue to try to use the offer that's already in the process of being sent.

Writing WebSocket client applications - Web APIs
var examplesocket = new websocket("wss://www.example.com/socketserver", "protocolone"); on return, examplesocket.readystate is connecting.
... the readystate will become open once the connection is ready to transfer data.
... if you want to open a connection and are flexible about the protocols you support, you can specify an array of protocols: var examplesocket = new websocket("wss://www.example.com/socketserver", ["protocolone", "protocoltwo"]); once the connection is established (that is, readystate is open), examplesocket.protocol will tell you which protocol the server selected.
... examplesocket.send(json.stringify(msg)); // blank the text input element, ready to receive the next line of text from the user.

Movement, orientation, and motion: A WebXR example - Web APIs
async function onxrbuttonclick(event) { if (!xrsession) { navigator.xr.requestsession(session_type) .then(sessionstarted); } else { await xrsession.end(); if (xrsession) { sessionended(); } } } this begins by looking at the value of xrsession to see if we already have a xrsession object representing an ongoing webxr session.
... if we already have an ongoing session, on the other hand, we call its end() method to stop the session.
...then we let the session know we're ready to draw a frame by calling its requestanimationframe() function.
...with webgl now configured to render to the xr device, we clear the frame to black and are ready to begin rendering.

Using IIR filters - Web APIs
but what is this and how does it differ from the biquadfilternode we have already?
...it's a commonly-used type and we already have it as a node in the web audio api.
...and this is where the iir filter node is useful — you can create your own if none of the alaready available settings is right for what you want.
... if you want to play with the iir filter node and need some values to help along the way, there's a table of already calculated values here; on pages 4 & 5 of the linked pdf the an values refer to the feedforward values and the bn values refer to the feedback.

Using the Web Storage API - Web APIs
refox e.code === 22 || // firefox e.code === 1014 || // test name field too, because code might not be present // everything except firefox e.name === 'quotaexceedederror' || // firefox e.name === 'ns_error_dom_quota_reached') && // acknowledge quotaexceedederror only if there's something already stored (storage && storage.length !== 0); } } and here is how you would use it: if (storageavailable('localstorage')) { // yippee!
... testing whether your storage has been populated to start with, in main.js, we test whether the storage object has already been populated (i.e., the page was previously accessed): if(!localstorage.getitem('bgcolor')) { populatestorage(); } else { setstyles(); } the storage.getitem() method is used to get a data item from storage; in this case, we are testing to see whether the bgcolor item exists; if not, we run populatestorage() to add the existing customization values to the storage.
... if there are already values there, we run setstyles() to update the page styling with the stored values.
... setting values in storage storage.setitem() is used both to create new data items, and (if the data item already exists) update existing values.

XMLHttpRequest - Web APIs
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.
... event handlers onreadystatechange as a property of the xmlhttprequest instance is supported in all browsers.
... methods xmlhttprequest.abort() aborts the request if it has already been sent.

Media events - Developer guides
this corresponds to the have_future_data readystate.
... canplaythrough sent when the readystate changes to have_enough_data, indicating that the entire media can be played without interruption, assuming the download rate remains at least at the current level.
... emptied the media has become empty; for example, this event is sent if the media has already been loaded (or partially loaded), and the load() method is called to reload it.
... mozaudioavailable sent when an audio buffer is provided to the audio layer for processing; the buffer contains raw audio samples that may or may not already have been played by the time you receive the event.

<input type="datetime-local"> - HTML: Hypertext Markup Language
for example, if you are creating a system where the user is likely to already be logged in, with their locale already set, you could provide the timezone in a hidden input type.
...exactly because you will already be dead, so the companies using your software will be stuck using your software without any other coder who knows the system well enough to come in and fix it.
...ne'; fallbackpicker.style.display = 'block'; fallbacklabel.style.display = 'block'; // populate the days and years dynamically // (the months are always the same, therefore hardcoded) populatedays(monthselect.value); populateyears(); populatehours(); populateminutes(); } function populatedays(month) { // delete the current set of <option> elements out of the // day <select>, ready for the next set to be injected while(dayselect.firstchild){ dayselect.removechild(dayselect.firstchild); } // create variable to hold new number of days to inject var daynum; // 31 or 30 days?
...daynum = 29 : daynum = 28; } // inject the right number of new <option> elements into the day <select> for(i = 1; i <= daynum; i++) { var option = document.createelement('option'); option.textcontent = i; dayselect.appendchild(option); } // if previous day has already been set, set dayselect's value // to that day, to avoid the day jumping back to 1 when you // change the year if(previousday) { dayselect.value = previousday; // if the previous day was set to a high number, say 31, and then // you chose a month with less total days in it (e.g.

Cross-Origin Resource Sharing (CORS) - HTTP
note: these are the same kinds of cross-site requests that web content can already issue, and no response data is released to the requester unless the server sends an appropriate header.
...code of this sort might be used in javascript deployed on foo.example: const xhr = new xmlhttprequest(); const url = 'https://bar.other/resources/public-data/'; xhr.open('get', url); xhr.onreadystatechange = somehandler; xhr.send(); this performs a simple exchange between the client and the server, using cors headers to handle the privileges: let's look at what the browser will send to the server in this case, and let's see how the server responds: get /resources/public-data/ http/1.1 host: bar.other user-agent: mozilla/5.0 (macintosh; intel mac os x 10.14; rv:71.0) gecko/20100101 ...
... the following is an example of a request that will be preflighted: const xhr = new xmlhttprequest(); xhr.open('post', 'https://bar.other/resources/post-here/'); xhr.setrequestheader('x-pingother', 'pingpong'); xhr.setrequestheader('content-type', 'application/xml'); xhr.onreadystatechange = handler; xhr.send('<person><name>arun</name></person>'); the example above creates an xml body to send with the post request.
...content on foo.example might contain javascript like this: const invocation = new xmlhttprequest(); const url = 'http://bar.other/resources/credentialed-content/'; function callotherdomain() { if (invocation) { invocation.open('get', url, true); invocation.withcredentials = true; invocation.onreadystatechange = handler; invocation.send(); } } line 7 shows the flag on xmlhttprequest that has to be set in order to make the invocation with cookies, namely the withcredentials boolean value.

JavaScript modules - JavaScript
most servers already set the correct type for .js files, but not yet for .mjs files.
... servers that already serve .mjs files correctly include github pages and http-server for node.js.
... this is ok if you are using such an environment already, or if you aren't but you know what you are doing and have access (i.e.
... modules and classes as we hinted at earlier, you can also export and import classes; this is another option for avoiding conflicts in your code, and is especially useful if you've already got your module code written in an object-oriented style.

Promise.all() - JavaScript
return value an already resolved promise if the iterable passed is empty.
...note, google chrome 58 returns an already resolved promise in this case.
... if an empty iterable is passed, then this method returns (synchronously) an already resolved promise.
...logs // promise { <state>: "fulfilled", <value>: array[3] } // promise { <state>: "fulfilled", <value>: array[4] } // promise { <state>: "rejected", <reason>: 555 } asynchronicity or synchronicity of promise.all this following example demonstrates the asynchronicity (or synchronicity, if the iterable passed is empty) of promise.all: // we are passing as argument an array of promises that are already resolved, // to trigger promise.all as soon as possible var resolvedpromisesarray = [promise.resolve(33), promise.resolve(44)]; var p = promise.all(resolvedpromisesarray); // immediately logging the value of p console.log(p); // using settimeout we can execute code after the stack is empty settimeout(function() { console.log('the stack is now empty'); console.log(p); }); // logs, in or...

Navigation and resource timings - Web Performance
fetchstart when the browser is ready to fetch the document using an http request.
... domloading when the parser started its work, that is when its document.readystate changes to 'loading' and the corresponding readystatechange event is thrown.
... dominteractive when the parser finished its work on the main document, that is when its document.readystate changes to 'interactive' and the corresponding readystatechange event is thrown.
... domcomplete when the parser finished its work on the main document, that is when its document.readystate changes to 'complete' and the corresponding readystatechange event is thrown.

The building blocks of responsive design - Progressive web apps (PWAs)
typical desktop layout in our example, we have a desktop layout, as we've already seen.
...as mentioned above, we used mozilla brick, a collection of ready-rolled mobile ui components, in the making of the mobile app layout.
...for more on using brick, read mozilla brick: ready made ui components.
...but those solutions are definitely not ready for production yet — both are in a very early stage of standardization, and have no support across browsers.

Interacting with page scripts - Archive of obsolete content
the "main.js" opens the local file "page.html" and attaches a content script to it: // main.js var tabs = require("sdk/tabs"); var self = require("sdk/self"); tabs.open({ url: self.data.url("page.html"), onready: attachscript }); function attachscript(tab) { tab.attach({ contentscriptfile: self.data.url("content-script.js") }); } the content script defines an object and assigns it to unsafewindow twice: the first time using cloneinto(), the second time using simple assignment: // content-script.js var contentscriptobject = {"greeting" : "hello from add-on"}; unsafewindow.clonedcontentscript...
...the "main.js" opens the local file "page.html" and attaches a content script to it: // main.js var tabs = require("sdk/tabs"); var self = require("sdk/self"); tabs.open({ url: self.data.url("page.html"), onready: attachscript }); function attachscript(tab) { tab.attach({ contentscriptfile: self.data.url("content-script.js") }); } the content script defines a function greetme() and exports it to the page script context.
...n.js" will create a page-mod that will attach "content-script.js" to the target web page, and will then load the target web page: var tabs = require("sdk/tabs"); var mod = require("sdk/page-mod"); var self = require("sdk/self"); var pageurl = self.data.url("page.html") var pagemod = mod.pagemod({ include: pageurl, contentscriptfile: self.data.url("content-script.js"), contentscriptwhen: "ready" }) tabs.open(pageurl); the target web page "page.html" includes a button and a page script: <html> <head> <meta charset="utf-8"> </head> <body> <input id="message" type="button" value="send a message"/> <script type="text/javascript" src="page-script.js"></script> </body> </html> the content script "content-script.js" adds an event listener to the button, that sends a cu...

/loader - Archive of obsolete content
provide an environment for loading commonjs style modules, which makes it possible to consume lots of interesting code that has already been developed.
... to reuse module instances that are already loaded.
...}) require() as already mentioned in loading modules it's common to start execution by loading a main module.

platform/xpcom - Archive of obsolete content
if the factory or service is already registered, this function throws components.results.ns_error_factory_exists.
... so if a factory is registered with the contract id "@me.org/mycomponent", and another factory is already registered with that contract id, then: components.classes["@me.org/mycomponent"] will return the old factory, while: xpcom.factorybycontract("@me.org/mycomponent") will return the new one.
... if the object implements an interface that's already defined in xpcom, you can pass that in here: var about = aboutfactory.createinstance(null, ci.nsiaboutmodule); // you can now access the nsiaboutmodule interface of the 'about' object if you will be getting the wrappedjsobject property from the returned object to access its javascript implementation, pass ci.nsisupports here: var custom = factory.createinstance(null, ci.nsisupports).wrappedjso...

Creating custom Firefox extensions with the Mozilla build system - Archive of obsolete content
i'm assuming that you've already built firefox successfully.
...if you already have a mozilla build, you can avoid this by creating a makefile for your extension directly.
...just displaying a new menu item that opens a "hello, world!" dialog box would be already be a great exercise to get warmed up with.

How to convert an overlay extension to restartless - Archive of obsolete content
step 2a: load your jsm from chrome:// now with that preface out of the way, this part is easy: drop support for firefox 3.x if you haven't already, move your jsm files to wherever you've got your chrome mapping to for your xul overlay and/or windows, import your files from that new chrome mapped path instead of the old resource one, and remove your "resource" line from your chrome.manifest file.
...in such cases, request.readystate == 4, request.status == 0 and request.response will evaluate to true.
...if you were using input streams you already had to deal with this because they weren't an option without extraction.

Tabbed browser - Archive of obsolete content
current: true}); gsessionstore.settabstate(tab, json.stringify({ entries: [ { title: url } ], usertypedvalue: url, usertypedclear: 2, lastaccessed: tab.lastaccessed, index: 1, hidden: false, attributes: {}, image: null })); reusing tabs rather than open a new browser or new tab each and every time one is needed, it is good practice to try to re-use an existing tab which already displays the desired url--if one is already open.
...the following code demonstrates how to re-use an existing tab that already displays the desired url/uri.
....hasmoreelements()) { var browserwin = browserenumerator.getnext(); var tabbrowser = browserwin.gbrowser; // check each tab of this browser instance var numtabs = tabbrowser.browsers.length; for (var index = 0; index < numtabs; index++) { var currentbrowser = tabbrowser.getbrowseratindex(index); if (url == currentbrowser.currenturi.spec) { // the url is already opened.

Localizing an extension - Archive of obsolete content
if you haven't already created an extension, or would like to refresh your memory, take a look at the previous articles in this series: creating a status bar extension creating a dynamic status bar extension adding preferences to an extension download the sample you can download this article's sample code so you can look at it side-by-side with the article, or to use it as a basis for your own extension.
...we do this by creating a string bundle, using the following code: <stringbundleset id="stringbundleset"> <stringbundle id="string-bundle" src="chrome://stockwatcher2/locale/stockwatcher2.properties"/> </stringbundleset> this establishes a new string bundle, referenced by the id "string-bundle", whose keys and values are to be loaded from the stockwatcher2.properties file we've already created.
...id="myextensionname-filename") update the javascript code now we're ready to revise the javascript code to load the strings from the string bundle instead of using literal strings.

Mozilla Crypto FAQ - Archive of obsolete content
also note that mozilla support for pgp and other security schemes may also be made available by commercial security vendors or by independent developers, using the various public apis already present in mozilla.
... however, in an advisory opinion issued in reference to the bernstein case, the bureau of export administration (bxa) has stated the following: "concerning the posting onto a mirror or archive site of already-posted source code, notification is required only for the initial posting." bxa and nsa have already been notified of the posting of encryption-related source code on the mozilla site, and in light of this opinion we have therefore decidednot to ask mirror sites to provide notification themselves.
...export controls on encryption software already been ruled unconstitutional?

Frequently Asked Questions - Archive of obsolete content
to help us make the best use of our time, please first search in the svg component of our bug database to check that the issue hasn't already been reported.
...however, mozilla's implementation already supports some things that adobe's lacks, particularly parts of the xml and svg doms.
...if you don't have an irc client then install chatzilla into mozilla/mozilla firefox (note it may already be built in).

Using gdb on wimpy computers - Archive of obsolete content
how do i see what libraries i already have loaded?
... you can see what libraries you already have loaded with the info sharedlibrary command: (gdb) info shar from to syms read shared object library 0x4044a000 0x4044d08c yes /lib/libdl.so.2 0x4044e000 0x4048ff90 yes /usr/lib/libstdc++-libc6.1-1.so.2 0x40491000 0x404ad9d8 yes /lib/libm.so.6 0x404ae000 0x405a285c yes /lib/libc.so.6 0x40000000 0x40013ed0 yes /lib/ld-linux.so.2 0x40607000 0x4061554c no /usr/lib/libz.so.1 0x40763000 0x4088af74 no /usr/lib/libgtk-1.2.so.0 0x4088b000 0x408c04d4 no /usr/lib/libgdk-1.2.so.0 [...] gdb is taking forever to load a shared library.
...versions of gdb earlier than 5 use a very slow algorithm for walking the list of already loaded symbols as it adds symbols to its symbol table.

Venkman Introduction - Archive of obsolete content
even if you are already using venkman, the features, procedures, and tips described here will make you a more confident web developer and debugger.
... if you don't already have venkman or would like to upgrade, you can easily get the latest version from firefox add-ons.
...but the steps described here can give you a basic feel for the debugger if you haven't already had some experience using it, and they provide the basis for the more interesting and practical examples in the articles that follow this one.

Anonymous Content - Archive of obsolete content
focus events should also be stopped if the bound element is already focused.
... for example, if the user has already focused the textfield within an html file upload control, then the file upload control is now also focused.
... if the user then focuses the button inside the file upload control, the focus event generated for the button is stopped before it reaches the file control, since the file control is already focused.

Elements - Archive of obsolete content
if supported, in strongly typed languages the bound element can be referenced not only as any of the interfaces that the element might already support (e.g., htmlelement) but also as any of the interfaces described by this attribute.
...so full access to anonymous nodes generated by the binding is already possible.
... here are some examples of cases in which the behavior of your code may change due to this change in firefox 3: if you have two fields, one named a and one named b, and field a sets .b, the value of .b will depend on whether or not .a has already been accessed.

Writing to Files - Archive of obsolete content
if this flag is not used, the data is written at the beginning of the file, overwriting what is already there.
... nocreate if used, don't create a new file if it does not already exist.
...in either case, if the file already exists, it will be truncated to zero length.

MenuModification - Archive of obsolete content
the appenditem method will create a menupopup element if it doesn't already exist.
... if the menu already has a menupopup, the new menuitem will be appended to this existing one.
...the first time the function is called, the haschildnodes method will return false, however the second time, the method will return true as the items have already been added to the menu.

OpenClose - Archive of obsolete content
these are: if the menu is already open, or already in the process of being opened.
... naturally, attempting to open a menu that is already open doesn't have any effect.
... for example, you could use the state property to determine if a panel is already open.

PopupEvents - Archive of obsolete content
the popupshown event the popupshown event is fired once a popup is already visible.
...you also cannot cancel the hiding of a menupopup when a user has made a selection from a menu, as it is already too late to do so.
... in this situation the command event has already been sent to the selected menuitem and the operation already carried out.

RDF Modifications - Archive of obsolete content
when parsing, any triples that already exist are not added again.
...assuming that the 'obelisk' photo doesn't have a description already, adding the triple listed above should cause a new result to be available for this photo.
...the only extra complication to deal with in the multiple query case is when a particular result's member resource already matches a query, yet the new rdf triple would cause an earlier query to match.

Using the Editor from XUL - Archive of obsolete content
note: since we already know this when we have an <editor></editor> tag, we should remove the need to call this.
... the editor is now set up, and ready to go.
... now we are ready to actually insert the text.

XML - Archive of obsolete content
using a combination of xul's ready-made widgets (e.g., menubar, scrollbar, progressmeter, and so on) and xul's incorporation of such standards as html4, dom1/2, and cascading stylesheets, you can design any interface that you can imagine, using any number of different features, tools, and methodologies.
...any familiarity you already have with xml will help you quickly get up to speed developing with xul.
...like all really good technologies, xul and its xp cousins are already being used in ways not imagined by their creators and growing propitiously out of control.

prefwindow - Archive of obsolete content
if a window with that type is already open, this method will just switch that window to the front and focus it instead of opening another window.
... notes usage patterns opening/initializing a prefwindow note that you can define an initwithparams() function in your sub window - to handle parameters passed using openwindow() in case the window was already open.
... initwithparams(window.arguments[0]); // we expect a single parameter to be passed to the window } function initwithparams(aparams) { // this will also get called when an already open window is activated using openwindow() } closing a prefwindow sometimes you need to do things when the prefwindow is closed, such as things that can't (or shouldn't) be handled as preferences, such as saving passwords or updating sqlite data.

richlistbox - Archive of obsolete content
efix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata additemtoselection( item ) return type: no return value selects the given item, without deselecting any other items that are already selected.
...if the item is already visible, no scrolling occurs.
...if the item is already visible, no scrolling occurs.

2006-10-27 - Archive of obsolete content
he has already built firefox 1.5.0.7 on the same machine with no problems.
... discussions final ff release already announced october 23rd: axel hecht posted an answer to cédric corazza posting.
... cédric's posting was about a french site which had already announced the availablity of ff 2.0 final release and provided download links, even though the release was on october 24.

Reference - Archive of obsolete content
this will impact the presentation of future examples if it hasn't already.
...--jonnyq i've already added those methods in the methods listing, but i haven't defined them yet.
...--davidcary 06:42, 31 january 2007 (pst) we already discussed this.

Game distribution - Game development
self-hosting if you are a front-end developer, you may already know what to do.
... the chrome web store is also an attractive option — again, having a manifest file ready, zipping your game and filling in the online submission form is about all that's required.
...native stores are already filled with established devs selling great games, so you have to be talented and lucky to get noticed.

Building up a basic demo with PlayCanvas editor - Game development
when you are ready to continue with our tutorial, go to your canvas homepage — for example mine is https://playcanvas.com/end3r.
...even though it's a blank new project we don't have to start entirely from scratch — the camera and directional light are prepared already, so you don't have to worry about them.
...as you can see, the file contains some boilerplate code already: pc.script.create('boxanimation', function (app) { // creates a new boxanimation instance var boxanimation = function (entity) { this.entity = entity; }; boxanimation.prototype = { // called once after all resources are loaded and before the first update initialize: function () { }, // called every frame, dt is time in seconds since last ...

Building up a basic demo with the PlayCanvas engine - Game development
if you have already worked through our building up a basic demo with three.js article (or you are familiar with other 3d libraries) you'll notice that playcanvas works on similar concepts: camera, light and objects.
...there is one helper variable already included, which will store a reference to the <canvas> element.
... animation we already used translate or rotate to adjust the position of the shapes; we could also change their positions directly with setposition, or scale them.

Unconventional controls - Game development
there's already a gamepad api working on the desktop computers, so we can imitate the experience, but we can go even further.
...captain rogers had the keyboard controls implemented already: this.cursors = this.input.keyboard.createcursorkeys(); //...
...the last value is grabstrength, which is a float between 0 and 1 — when reaching 1 (fist fully clenched), we show an alert for now (in a full game this could be replaced with the shooting logic.) that's it — everything you needed for a working leap motion example in javascript is here already.

WAI-ARIA basics - Learn web development
let's look at an example — our website-no-roles example (see it live) has the following structure: <header> <h1>...</h1> <nav> <ul>...</ul> <form> <!-- search form --> </form> </nav> </header> <main> <article>...</article> <aside>...</aside> </main> <footer>...</footer> if you try testing the example with a screenreader in a modern browser, you'll already get some useful information.
...we already talked about using the aria-label property to provide a label where we don't want the label to be visible to sighted users (see the signposts/landmarks section, above).
...enabled; use it to tell us what you play.'; } else { instruitem.input.disabled = true; instruitem.label.style.color = '#999'; instruitem.input.setattribute('aria-disabled', 'true'); instruitem.input.removeattribute('aria-label'); hiddenalert.textcontent = 'instruments played field now disabled.'; } } describing non-semantic buttons as buttons a few times in this course already, we've mentioned the native accessibilty of (and the accessibility issues behind using other elements to fake) buttons, links, or form elements (see ui controls in the html accessibility article, and enhancing keyboard accessibility, above).

Grids - Learn web development
>seven</div> </div> .container { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); grid-auto-rows: minmax(100px, auto); grid-gap: 20px; } this works because grid is creating as many 200 pixel columns as will fit into the container, then sharing whatever space is leftover between all of the columns — the maximum is 1fr which, as we already know, distributes space evenly between tracks.
...it has a grid defined already, and a simple article outlined.
... a css grid, grid framework grid "frameworks" tend to be based around 12 or 16 column grids and with css grid, you don’t need any third party tool to give you such a framework — it's already there in the spec.

Legacy layout methods - Learn web development
there are many flexbox-based grid systems available and flexbox can solve many of the issues that we’ve already discovered when creating our grid above.
...class="col">8</div> <div class="col">9</div> <div class="col">10</div> <div class="col">11</div> <div class="col">12</div> </div> <div class="row"> <div class="col">13</div> <div class="col">14</div> <div class="col">15</div> <div class="col">16</div> </div> </div> to start using skeleton we need to give the wrapper <div> a class of container — this is already included in our html.
...we've done this already as well.

CSS layout - Learn web development
at this point we've already looked at css fundamentals, how to style text, and how to style and manipulate the boxes that your content sits inside.
... get started prerequisites before starting this module, you should already: have basic familiarity with html, as discussed in the introduction to html module.
... introduction to css layout this article will recap some of the css layout features we've already touched upon in previous modules — such as different display values — and introduce some of the concepts we'll be covering throughout this module.

Fundamental text and font styling - Learn web development
as you'll have already experienced in your work with html and css, text inside an element is laid out inside the element's content box.
... text-decoration: sets/unsets text decorations on fonts (you'll mainly use this to unset the default underline on links when styling them.) available values are: none: unsets any text decorations already present.
... you've reached the end of this article, and already did some skill testing in our active learning section, but can you remember the most important information going forward?

What are browser developer tools? - Learn web development
if the tools are already displayed, click on the debugger tab.
...(opera works the same way.) edge and internet explorer 11: press f12 and then, ctrl + 3, or if the tools are already displayed, click on the debugger tab.
...to access the console in any browser: if the developer tools are already open, click or press the console tab.

What is a Domain Name? - Learn web development
ed domain status: clientupdateprohibited registrant id:mmr-33684 registrant name:dns admin registrant organization:mozilla foundation registrant street: 650 castro st ste 300 registrant city:mountain view registrant state/province:ca registrant postal code:94041 registrant country:us registrant phone:+1.6509030800 as you can see, i can't register mozilla.org because the mozilla foundation has already registered it.
... as we already saw, when you want to display a webpage in your browser it's easier to type a domain name than an ip address.
... your browser asks your computer if it already recognizes the ip address identified by this domain name (using a local dns cache).

Basic native form controls - Learn web development
you've already met some form elements, including <form>, <fieldset>, <legend>, <textarea>, <label>, <button>, and <input>.
...they are a very convenient way to let the user enter any kind of data, and we've already seen a few simple examples.
...you've met some of these already, but below is a list of those common attributes, for your reference: attribute name default value description autofocus false this boolean attribute lets you specify that the element should automatically have input focus when the page loads.

HTML basics - Learn web development
an attribute should always have the following: a space between it and the element name (or the previous attribute, if the element already has one or more attributes).
...take the <img> element that we already have in our html page: <img src="images/firefox-icon.png" alt="my test image"> this contains two attributes, but there is no closing </img> tag and no inner content.
... add a link to your page now, if you haven't already done so.

Installing basic software - Learn web development
a library tends to be an existing javascript or css file that provides ready-rolled functionality for you to make use of in your code.
... installing a text editor you probably already have a basic text editor on your computer.
... before going on, you should install at least two of these browsers and have them ready for testing.

JavaScript basics - Learn web development
-, *, / 9 - 3; 8 * 2; // multiply in js is an asterisk 9 / 3; assignment as you've seen already: this assigns a value to a variable.
...you have already seen some uses of functions previously.
... if it isn't (meaning it must already have changed), the src value swaps back to the original image path, to the original state.

Structuring a page of content - Learn web development
previous overview: introduction to html structuring a page of content ready for laying it out using css is a very important skill to master, so in this assessment you'll be tested on your ability to think about how a page might end up looking, and choose appropriate structural semantics to build a layout on top of.
... prerequisites: before attempting this assessment you should have already worked through the rest of the course, with a particular emphasis on document and website structure.
... details of what you have already tried, and what you would like us to do, e.g.

Mozilla splash page - Learn web development
prerequisites: before attempting this assessment you should have already worked through the rest of the multimedia and embedding module.
...then save pattern.png in the same directory (right click on the image to get an option to save it.) access the different images in the originals directory and save them in the same way; you'll want to save them in a different directory for now, as you'll need to manipulate (some of) them using a graphics editor before they're ready to be used.
... details of what you would like us to do — for example what you have already tried, if you are stuck and need help,.

Looping code - Learn web development
we already met this in the previous article when we looked at switch statements — when a case is met in a switch statement that matches the input expression, the break statement immediately exits the switch statement and moves onto the code after it.
... we store the value entered into the text input in a variable called searchname, before then emptying the text input and focusing it again, ready for the next search.
... we've already provided you with: let i = 0; — your initializer.

Video and Audio APIs - Learn web development
implementing the javascript we've got a fairly complete html and css interface already; now we just need to wire up all the buttons to get the controls working.
...regardless of whether the video was paused or playing when the stop button is pressed, you want it to be ready to play afterwards.
... we use an if statement to check whether the active class has been set on the rwd button, indicating that it has already been pressed.

Arrays - Learn web development
if we had 10 items to add to the invoice it would already be annoying, but what about 100 items, or 1000?
...if you've not already followed that section, create the array first in your console: let myarray = ['manchester', 'london', 'liverpool', 'birmingham', 'leeds', 'carlisle']; first of all, to add or remove an item at the end of an array we can use push() and pop() respectively.
... in the list for (let i = 0; i < myhistory.length; i++) { itemtext = myhistory[i]; const listitem = document.createelement('li'); listitem.textcontent = itemtext; list.appendchild(listitem); } // if the array length is 5 or more, remove the oldest search term if (myhistory.length >= 5) { // number 2 } // empty the search input and focus it, ready for the next term to be entered searchinput.value = ''; searchinput.focus(); } } </textarea> <div class="playable-buttons"> <input id="reset" type="button" value="reset"> <input id="solution" type="button" value="show solution"> </div> html { font-family: sans-serif; } h2 { font-size: 16px; } .a11y-label { margin: 0; text-align: right; font-size: 0.7rem; width: 98%; ...

Adding features to our bouncing balls demo - Learn web development
prerequisites: before attempting this assessment you should have already worked through all the articles in this module.
...if it doesn't exist, it has already been eaten by the evil circle, so there is no need to check it again.
... details of what you have already tried, and what you would like us to do, e.g.

JavaScript object basics - Learn web development
overview: objects next in this article, we'll look at fundamental javascript object syntax, and revisit some javascript features that we've already seen earlier in the course, reiterating the fact that many of the features you've already dealt with are objects.
...while working with this example you should have your developer tools javascript console open and ready to type in some commands.
...try entering the following line below the javascript code that's already in your file, then saving and refreshing: const person = {}; now open your browser's javascript console, enter person into it, and press enter/return.

Working with Svelte stores - Learn web development
code along with us git clone the github repo (if you haven't already done it) with: git clone https://github.com/opensas/mdn-svelte-tutorial.git then to get to the current app state, run cd mdn-svelte-tutorial/06-stores or directly download the folder's content: npx degit opensas/mdn-svelte-tutorial/06-stores remember to run npm install && npm run dev to start your app in development mode.
... repl to code along with us using the repl, start at https://svelte.dev/repl/d1fa84a5a4494366b179c87395940039?version=3.23.2 dealing with our app state we have already seen how our components can communicate with each other using props, two-way data binding, and events.
...if you’ve already worked with redux or vuex, then you'll be familiar with how this kind of store works.

What to do and what not to do in Bugzilla
resolving bugs as duplicate in general newer bugs should be marked as duplicates of older bugs, except when the newer bug contains more information (bug description clearer, patch already attached, lots of people already cc'ed, etc.).
...reports of problems with specific websites that result from bad coding practices already determined to be “tech evangelism” cases by the module owner or peer, or problems that result from the use of proprietary technology, should be be moved to the tech evangelism product rather than being resolved as invalid.
...this isn't mandatory, but can help prevent accidental filing of duplicates of a bug that's already been fixed.

Frame script loading and lifetime
passing allowdelayedload is a way to ensure that the script is loaded correctly, in case the tab is not ready when making the call.
... disable any frame scripts already loaded.
... there is no mechanism to unload frame scripts which are already loaded.

Following the Android Toasts Tutorial from a JNI Perspective
this is the template that will follow our object of signatures: var my_jenv = null; try { my_jenv = jni.getforthread(); // do the jni work here } finally { if (my_jenv) { jni.unloadclasses(my_jenv); } } the reason we choose my_jenv for a variable name, and not jenv, is because the global privileged window scope of firefox for android has a variable jenv already, and we don't want to mix.
... declare constructors, methods, and fields now that the sig's and java environment is ready, it is now possible to declare the constructors, methods, and fields.
...we will add this to our sig object in slash notation: geckoappshell: 'lorg/mozilla/gecko/geckoappshell;' we then instantiate the geckoappshell class in jni and declare the getcontext method; dxr showed that this method accepted no arguments and returns a context, and we already had the sig for context in our sig object.

Deferred
if the associated promise has already been resolved, either to a value, a rejection, or another promise, this method does nothing.
... note: calling this method with a pending promise as the avalue argument, and then calling it again with another value before the promise is resolved or rejected, will have no effect the second time, as the associated promise is already resolved to the pending promise value as its resolution.
...if the promise has already been resolved, either to a value, a rejection, or another promise, this method does nothing.

SVN for Localizers
if you're already familiar with this information, skip ahead to mozilla's svn repositories.
...if you already installed cygwin but it didn't include the svn package, run the cygwin installer again and be sure to check the box beside subversion package.
... note: if you do not already have access to svn, visit this wiki page on how to get set up with an svn account before proceeding.

Mozilla Web Developer FAQ
however, it turns out mozilla is doing that already.
... mozilla’s standards mode is, obviously, already compatible with other browsers that implement the same standards reasonably correctly.
... on the other hand, mozilla’s quirks mode already accommodates common non-standardisms that are due to the behaviors of common legacy browsers.

Profiling with the Firefox Profiler
this is ideal for a responsive application to be ready to service incoming events.
... it's a good idea to search bugzilla before filing a bug about a performance problem in firefox but sometimes it's hard to find issues that have already been reported.
...nightly builds are already built with the appropriate flags.

NSPR Poll Method
the prototype of the poll method is print16 poll_method(prfiledesc *fd, print16 in_flags, print16 *out_flags); the purpose of the poll method is to allow a layer to modify that flags that will ultimately be used in the call to the underlying network transport's select (or equivalent) function, and to indicate that a layer is already able to make progress in the manner suggested by the polling flags.
... for pr_recv, you should pass pr_poll_read as the in_flags argument to the poll method for pr_send, you should pass pr_poll_write as the in_flags argument to the poll method out_flags [output argument] if an i/o layer is ready to satisfy the i/o request defined by in_flags without involving the underlying network transport, its poll method sets the corresponding event in *out_flags on return.
...if the caller wishes to test for read ready (that is, pr_poll_read is set in in_flags) and the layer has input data buffered, the poll method would set the pr_poll_read event in *out_flags.

PR_MkDir
all the path components up to but not including the leaf component must already exist.
...all the path components up to but not including the leaf component must already exist.
... for example, if the pathname of the directory to be created is a/b/c/d, the directory a/b/c must already exist.

PR_OpenSharedMemory
syntax #include <prshm.h> nspr_api( prsharedmemory * ) pr_opensharedmemory( const char *name, prsize size, printn flags, printn mode ); /* define values for pr_opensharememory(...,create) */ #define pr_shm_create 0x1 /* create if not exist */ #define pr_shm_excl 0x2 /* fail if already exists */ parameters the function has the following parameters: name the name of the shared memory segment.
...when parameter create is (pr_shm_excl | pr_shm_create) and the shared memory already exists, the function returns null with the error set to pr_file_exists_error.
... when parameter create is pr_shm_create and the shared memory already exists, a handle to that memory segment is returned.

Enc Dec MAC Using Key Wrap CertReq PKCS10 CSR
rv = secsuccess; prarenapool *arena = null; void *exthandle = null; prfiledesc *outfile = null; certsubjectpublickeyinfo *spki = null; certcertificaterequest *cr = null; secitem *encoding = null; /* if the certificate request file already exists, delete it */ if (pr_access(certreqfilename, pr_access_exists) == pr_success) { pr_delete(certreqfilename); } /* open the certificate request file to write */ outfile = pr_open(certreqfilename, pr_create_file | pr_rdwr | pr_truncate, 00660); if (!outfile) { pr_fprintf(pr_stderr, "unable to open \"%s\" for writing (%ld, %ld).\n...
... const char *nicknamestr, prbool sigverify) { secstatus rv = secsuccess; prfiledesc *headerfile = null; certcertificate *cert = null; headertype htype = certenc; /* if the intermediate header file already exists, delete it */ if (pr_access(headerfilename, pr_access_exists) == pr_success) { pr_delete(headerfilename); } headerfile = pr_open(headerfilename, pr_create_file | pr_rdwr | pr_truncate, 00660); if (!headerfile) { pr_fprintf(pr_stderr, "unable to open \"%s\" for writing (%ld, %ld).\n", headerfilename, pr_geterror(), pr_getoserror()); ...
... unsigned char ptext[modblocksize]; unsigned char encbuf[modblocksize]; unsigned int ptextlen; int index; unsigned int nwritten; unsigned int pad[1]; secitem paditem; unsigned int paddinglength = 0; seckeypublickey *pubkey = null; /* if the intermediate encrypted file already exists, delete it*/ if (pr_access(encryptedfilename, pr_access_exists) == pr_success) { pr_delete(encryptedfilename); } /* read certificate from header file */ rv = readfromheaderfile(headerfilename, certenc, &data, pr_true); if (rv != secsuccess) { pr_fprintf(pr_stderr, "could not read certificate from header file\n"); goto cleanup; } ...

sample2
ytype keytype, secoidtag hashalgtag, certname *subject, prbool ascii, const char *certreqfilename) { secoidtag signalgtag; secitem result; print32 numbytes; secstatus rv = secsuccess; prarenapool *arena = null; void *exthandle = null; prfiledesc *outfile = null; certsubjectpublickeyinfo *spki = null; certcertificaterequest *cr = null; secitem *encoding = null; /* if the certificate request file already exists, delete it */ if (pr_access(certreqfilename, pr_access_exists) == pr_success) { pr_delete(certreqfilename); } /* open the certificate request file to write */ outfile = pr_open(certreqfilename, pr_create_file | pr_rdwr | pr_truncate, 00660); if (!outfile) { pr_fprintf(pr_stderr, "unable to open \"%s\" for writing (%ld, %ld).\n", certreqfilename, pr_geterror(), pr_getoserror()); goto cleanu...
...inds the certificate using nickname and saves it to the header file */ secstatus addcertificatetoheader(pk11slotinfo *slot, secupwdata *pwdata, const char *headerfilename, certcertdbhandle *certhandle, const char *nicknamestr, prbool sigverify) { secstatus rv = secsuccess; prfiledesc *headerfile = null; certcertificate *cert = null; headertype htype = certenc; /* if the intermediate header file already exists, delete it */ if (pr_access(headerfilename, pr_access_exists) == pr_success) { pr_delete(headerfilename); } headerfile = pr_open(headerfilename, pr_create_file | pr_rdwr | pr_truncate, 00660); if (!headerfile) { pr_fprintf(pr_stderr, "unable to open \"%s\" for writing (%ld, %ld).\n", headerfilename, pr_geterror(), pr_getoserror()); rv = secfailure; goto cleanup; } cert = cert_findcertbynic...
...prfiledesc *headerfile = null; prfiledesc *encfile = null; prfiledesc *infile = null; certcertificate *cert = null; secitem data; unsigned char ptext[modblocksize]; unsigned char encbuf[modblocksize]; unsigned int ptextlen; int index; unsigned int nwritten; unsigned int pad[1]; secitem paditem; unsigned int paddinglength = 0; seckeypublickey *pubkey = null; /* if the intermediate encrypted file already exists, delete it*/ if (pr_access(encryptedfilename, pr_access_exists) == pr_success) { pr_delete(encryptedfilename); } /* read certificate from header file */ rv = readfromheaderfile(headerfilename, certenc, &data, pr_true); if (rv != secsuccess) { pr_fprintf(pr_stderr, "could not read certificate from header file\n"); goto cleanup; } /* read in an ascii cert and return a certcertificate */ cert...

FC_Login
the nss cryptographic module doesn't allow the so to log in if the normal user's pin is already initialized.
... ckr_user_already_logged_in: the user is already logged in.
... usertype is cku_so and the normal user's pin is already initialized.

NSC_Login
the nss cryptographic module doesn't allow the so to log in if the normal user's pin is already initialized.
... ckr_user_already_logged_in: the user is already logged in.
... usertype is cku_so and the normal user's pin is already initialized.

Hacking Tips
in lldb, if the allocation failure number shown is 1500, run `continue -i 1498` (subtracted 2 because we've already hit it once and don't want to skip the last).
... but in this case you may have to call cx->recoverfromoutofmemory() if something further down the stack has already reported the failure.
...// but if a different bit changes (either set or cleared), you may still stop // execution if the $mask bit happened to already be set.

Exact Stack Rooting
storing a gcpointer in a gcthing storing your gcpointer inside of a gcthing that is already in the liveset is the easiest way to keep a gcthing to the liveset.
...by using js::handlet in the interface instead of direct gcpointers, we ensure that the gcthing is already rooted on some previous stack frame, freeing us from having to worry about rooting the gcthing for the duration of the call.
...if you think you do need to do one of these, ask on one of spidermonkey's support forums: maybe we've already solved your problem using a different mechanism.

Thread Sanitizer
adjusting the build configuration create the build configuration file .mozconfig with the following content in your mozilla-central directory: mk_add_options moz_objdir=@topsrcdir@/objdir-ff-tsan mk_add_options moz_make_flags=-j12 # enable llvm specific code and build workarounds ac_add_options --enable-thread-sanitizer # if clang is already in your $path, then these can simply be: # export cc=clang # export cxx=clang++ export cc="/path/to/clang" export cxx="/path/to/clang++" # llvm-symbolizer displays much more complete backtraces when data races are detected.
... # if it's not already in your $path, then uncomment this next line: #export llvm_symbolizer="/path/to/llvm-symbolizer" # add tsan to our compiler flags export cflags="-fsanitize=thread -fpic -pie" export cxxflags="-fsanitize=thread -fpic -pie" # additionally, we need the tsan flag during linking.
.../bin/sh if [ -z $1 ] ; then echo "usage: $0 <dirname>" elif [ -d $1 ] ; then echo "directory $1 already exists" else autoconf2.13 mkdir $1 cd $1 llvm_root="/path/to/llvm" cc="$llvm_root/build/bin/clang" \ cxx="$llvm_root/build/bin/clang++" \ cflags="-fsanitize=thread -fpic -pie" \ cxxflags="-fsanitize=thread -fpic -pie" \ ldflags="-fsanitize=thread -fpic -pie" \ ../configure --disable-debug --enable-optimize="-o2 -gline-tables-only" --enable-llvm-hack...

Places utilities for JavaScript
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.
...der to get access to the bookmarks service, you have to run something like: components.classes["@mozilla.org/browser/nav-bookmarks-service;1"] .getservice(components.interfaces.nsinavbookmarksservice); with places utils all you need to write is: placesutils.bookmarks this should save on the number of references to the service that are needed, and can help clean up interfaces that are already fairly cluttered.
...information like keywords, descriptions, and post data is already stored as annotations by firefox, but you can create additional ones.

Building the WebLock UI
notice also that when it's clicked, the button executes a javascript function called addthissite(), which we've already defined in the weblock.js file in client code overview above.
...once it's installed and registered, the weblock component itself is ready to go: xpcom finds it and adds it to the list of registered components, and then weblock observes the xpcom startup event and initializes itself.
...this id is the same one used by the <statusbar/> in navigator.xul, which means that the overlay mechanism will merge the new ui here (i.e., the weblock statusbarpanel) and the ui already defined within that browser <statusbar/> at runtime.

Component Internals
once registration is complete and the notifications have fired, xpcom is ready to be used by the application.
... the shutdown process when the application is ready to shutdown xpcom, it calls ns_shutdownxpcom.
...instead of asking every developer to find and copy these various files into their own application, xpcom provides a single library of "not-ready-to-freeze-but-really-helpful" classes that you can link into your application, as the following figure demonstrates.

Finishing the Component
the interfaces needed to block certain urls from loading are not frozen, and there is still some debate about how exactly this functionality should be exposed to embedders and component developers, so the apis are not ready to be published.
...you have already registered as a category to receive startup notification.
...a good place to get an nsiioservice is in the component's observe() method, which already has a pointer to the service manager.

Preface
if you already have a mozilla build or the source from mozilla 1.2 or later, then you can use the xpcom framework available there.
... if you don't already have the mozilla source, then an even easier way to get and use xpcom is to download the gecko sdk, which is a collection of libraries and tools that features the xpcom component framework.
... whether you compile your code in the mozilla source tree or use the gecko sdk, you can build your own components which leverage components that already exist in gecko.

Using XPCOM Utilities to Make Things Easier
« previousnext » this chapter goes back over the code you've already created in the first part of the tutorial (see weblock1.cpp in the previous chapter) and uses xpcom tools that make coding a lot easier and more efficient.
...to avoid these kinds of redundancies, to regulate the way generic code is written, and to save typing, xpcom providesgeneric module macros that expand into the module code you've already seen.
...for weblock, where the string classes need to be only wrappers around already existing string data, trading advanced functionality for a much smaller footprint is the right way to go.

mozIStorageStatement
state long the current state defined by mozistoragestatement.moz_storage_statement_invalid, mozistoragestatement.moz_storage_statement_ready, or mozistoragestatement.moz_storage_statement_executing.
... moz_storage_statement_ready 1 the sql statement is ready to be executed.
... clone() creates a copy of the statement whose state will be mozistoragestatement.moz_storage_statement_ready.

nsIDOMOfflineResourceList
onupdateready nsidomeventlistener an event listener to be called when a resource update is ready; this event is not currently used since versioned application caches aren't supported yet.
... updateready 4 there is a new version of the application cache available.
...this means already loaded resources should only update after a page refresh.

nsIDocShell
if session storage object does not already exist, a new one will be created.
...if the timers are already running, this has no effect.
...if the timers are already suspended, this has no effect.

nsIFaviconService
if the icon data already exists, we won't normally try to re-load the icon from the net (or more likely the cache).
...this will make the notifications more efficient since the icon will already have data when the set favicon observer messages goes out.
...this will make the notifications more efficient since the icon will already have data when the set favicon observer messages goes out.

nsIGeolocationProvider
method overview boolean isready(); obsolete since gecko 1.9.2 void shutdown(); void startup(); void watch(in nsigeolocationupdate callback); methods isready() obsolete since gecko 1.9.2 (firefox 3.6 / thunderbird 3.1 / fennec 1.0) reports whether or not the device is ready and has a position.
... boolean isready(); parameters none.
... return value true if the device is ready and has a position available to return; otherwise false.

nsIScriptableIO
the file does not have to exist already; this method simply creates the file reference which may then be passed to the newinputstream() or newoutputstream() method to open the file for reading or writing.
... nocreate: if the file doesn't already exist, don't create a new file.
... notruncate: if the file already exists, overwrite the existing content instead of resetting the file size to 0 bytes.

nsIServiceManager
return value true if the service has already been created.
... return value true if the service has already been created.
... because services are instantiated lazily, methods are provided to test whether or not a service has already been instantiated.

nsITextInputProcessor
this means that the clause is already converted.
...this means that the clause is already converted and is selected to convert.
... if the instance has a composition already, this throws an exception.

nsIWindowWatcher
note: this method may dispatch a "toplevel-window-ready" notification via nsiobserverservice if the window did not already exist.
...must already be escaped, if applicable.
...if a window with this name already exists, the openwindow call may just load aurl in it (if aurl is not null) and return it.

nsIXULTemplateQueryProcessor
only fatal errors should be thrown, or ns_error_unexpected if generateresults() has already been called.
... exceptions thrown ns_error_unexpected if generateresults() has already been called.
...ns_error_unexpected if generateresults() has already been called.

Using the clipboard
// import the services module for future use, if we're not in // a browser window where it's already loaded.
...the transferable object will hold all of the data that you want until you're ready to put it on the clipboard.
...call setdata only when you're ready to copy to the system clipboard.

Gloda examples
a) show all messages in a conversation regardless of the folder in which they are stored, b) search messages by subject assuming that you have a message (glodamessage) in the conversation already, this is straight forward using glodamessage.conversation.getmessagescollection() alistener = { /* called when new items are returned by the database query or freshly indexed */ onitemsadded: function _onitemsadded(aitems, acollection) { }, /* called when items that are already in our collection get re-indexed */ onitemsmodified: function _onitemsmodified(aitems, acollection) { }, /* called when items ...
... searches for all messages within a date range id_q=gloda.newquery(gloda.noun_message); // define a date range form yesterday to now id_q.daterange([new date() - 86400000, new date()]); var mylistener = { /* called when new items are returned by the database query or freshly indexed */ onitemsadded: function _onitemsadded(aitems, acollection) { }, /* called when items that are already in our collection get re-indexed */ onitemsmodified: function _onitemsmodified(aitems, acollection) { }, /* called when items that are in our collection are purged from the system */ onitemsremoved: function _onitemsremoved(aitems, acollection) { }, /* called when our database query completes */ onquerycompleted: function _onquerycompleted(acollection) { var it...
...y(gloda.noun_message) msg_q.involves(id) msg_q.getcollection({ /* called when new items are returned by the database query or freshly indexed */ onitemsadded: function _onitemsadded(aitems, acollection) { }, /* called when items that are already in our collection get re-indexed */ onitemsmodified: function _onitemsmodified(aitems, acollection) { }, /* called when items that are in our collection are purged from the system */ onitemsremoved: function _onitemsremoved(aitems, acollection) { }, ...

Working with windows in chrome code
it contains tips and example code on opening new windows, finding an already opened window, and passing data between different windows.
... finding already opened windows the window mediator xpcom component (nsiwindowmediator interface) provides information about existing windows.
...=== example: opening a window only if it's not opened already === xxx tbd passing data between windows when working with multiple windows, you often need to pass information from one window to another.

Mozilla
this guide provides information that will not only help you get started as a mozilla contributor, but that you'll find useful to refer to even if you are already an experienced contributor.
... mozilla svg project since you have come this far, you probably already know that svg stands for scalable vector graphics, and that it is an xml language for sophisticated 2-dimensional graphics.
...it contains tips and example code on opening new windows, finding an already opened window, and passing data between different windows.

about:debugging (before Firefox 68) - Firefox Developer Tools
note that this feature isn't that immediately useful to debugging desktop tabs — you can open up a toolbox to debug a tab easily enough already — but this will become far more useful when about:debugging starts to support remote debugging, and this page can begin to list tabs available for debugging on mobile device browsers, simulators, etc.
... debugging workers for a service worker, if it is already running, you'll see two buttons next to it, labeled "debug" and "push".
... if it's not already running, you'll see one button, labeled "start": click this to start the service worker.

Document: DOMContentLoaded event - Web APIs
</script> checking whether loading is already complete domcontentloaded may fire before your script has a chance to run, so it is wise to check before adding a listener.
... function dosomething() { console.info('dom loaded'); } if (document.readystate === 'loading') { // loading hasn't finished yet document.addeventlistener('domcontentloaded', dosomething); } else { // `domcontentloaded` has already fired dosomething(); } live example html <div class="controls"> <button id="reload" type="button">reload</button> </div> <div class="event-log"> <label>event log:</label> <textarea readonly class="event-log-contents" rows="8" cols="30"></textarea> </div> css body { display: grid; grid-template-areas: "control log"; } .controls { grid-area: control; display: flex; align-items: center; justify-content: center; } .event-log { grid-area: log; } .event-log-contents { resize: none; } label, button { display: block; } #reload {...
...t: 2rem; } js const log = document.queryselector('.event-log-contents'); const reload = document.queryselector('#reload'); reload.addeventlistener('click', () => { log.textcontent =''; window.settimeout(() => { window.location.reload(true); }, 200); }); window.addeventlistener('load', (event) => { log.textcontent = log.textcontent + 'load\n'; }); document.addeventlistener('readystatechange', (event) => { log.textcontent = log.textcontent + `readystate: ${document.readystate}\n`; }); document.addeventlistener('domcontentloaded', (event) => { log.textcontent = log.textcontent + `domcontentloaded\n`; }); result specifications specification status comment html living standardthe definition of 'domcontentloaded' in that specification.

EventTarget.addEventListener() - Web APIs
simply because by the time the event listener would execute, the scope in which it was defined would have already finished executing.
...ure (will be ignored) */) { var self=this; var wrapper=function(e) { e.target=e.srcelement; e.currenttarget=self; if (typeof listener.handleevent != 'undefined') { listener.handleevent(e); } else { listener.call(self,e); } }; if (type=="domcontentloaded") { var wrapper2=function(e) { if (document.readystate=="complete") { wrapper(e); } }; document.attachevent("onreadystatechange",wrapper2); eventlisteners.push({object:this,type:type,listener:listener,wrapper:wrapper2}); if (document.readystate=="complete") { var e=new event(); e.srcelement=window; wrapper2(e); } } else { this.attachevent("...
... } }; var removeeventlistener=function(type,listener /*, usecapture (will be ignored) */) { var counter=0; while (counter<eventlisteners.length) { var eventlistener=eventlisteners[counter]; if (eventlistener.object==this && eventlistener.type==type && eventlistener.listener==listener) { if (type=="domcontentloaded") { this.detachevent("onreadystatechange",eventlistener.wrapper); } else { this.detachevent("on"+type,eventlistener.wrapper); } eventlisteners.splice(counter, 1); break; } ++counter; } }; element.prototype.addeventlistener=addeventlistener; element.prototype.removeeventlistener=removeeventlistener; if (htmldocument) { htmldocument.

FileSystemFlags - Web APIs
methods which accept an options parameter of this type may specify zero or more of these flags as fields in an object, like this: datadirectoryentry.getdirectory("workspace", { create: true }, function(entry) { }); here, we see that the create property is provided, with a value of true, indicating that the directory should be created if it's not already there.
...the parent directory must already exist.
... values and results the table below describes the result of each possible combination of these flags depending on whether or not the target file or directory path already exists.

HTMLMediaElement - Web APIs
htmlmediaelement.readystate read only returns a unsigned short (enumeration) indicating the readiness state of the media.
... emptied fired when the media has become empty; for example, when the media has already been loaded (or partially loaded), and the htmlmediaelement.load() method is called to reload it.
... play fired when the paused property is changed from true to false, as a result of the htmlmediaelement.play() method, or the autoplay attribute playing fired when playback is ready to start after having been paused or delayed due to lack of data progress fired periodically as the browser loads a resource.

Headers - Web APIs
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.set() sets a new value for an existing header inside a headers object, or adds the header if it does not already exist.
... 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 the set of values.

IDBDatabase: error event - Web APIs
bubbles yes cancelable no interface event event handler property onerror examples this example opens a database and tries to add a record, listening for the error event for the add() operation (this will occur if, for example, a record with the given tasktitle already exists): // open the database const dbopenrequest = window.indexeddb.open('todolist', 4); dbopenrequest.onupgradeneeded = (event) => { const db = event.target.result; // create an objectstore for this database const objectstore = db.createobjectstore('todolist', { keypath: 'tasktitle' }); // define what data items the objectstore will contain objectstore.createindex('hours', 'hours'...
...); objectstore.createindex('year', 'year', { unique: false }); }; dbopenrequest.onsuccess = (event) => { const newitem = { tasktitle: 'my task', hours: 10, minutes: 10, day: 10, month: 'january', year: 2020 }; const db = dbopenrequest.result; db.addeventlistener('error', () => { console.log(`error adding new item: ${newitem.tasktitle}`); }); // open a read/write db transaction, ready for adding the data const transaction = db.transaction(['todolist'], 'readwrite'); const objectstore = transaction.objectstore('todolist'); const objectstorerequest = objectstore.add(newitem); }; the same example, using the onerror property instead of addeventlistener(): // open the database const dbopenrequest = window.indexeddb.open('todolist', 4); dbopenrequest.onupgradeneeded = (eve...
...{ unique: false }); objectstore.createindex('year', 'year', { unique: false }); }; dbopenrequest.onsuccess = (event) => { const newitem = { tasktitle: 'my task', hours: 10, minutes: 10, day: 10, month: 'january', year: 2020 }; const db = dbopenrequest.result; db.onerror = () => { console.log(`error adding new item: ${newitem.tasktitle}`); }; // open a read/write db transaction, ready for adding the data const transaction = db.transaction(['todolist'], 'readwrite'); const objectstore = transaction.objectstore('todolist'); const objectstorerequest = objectstore.add(newitem); }; ...

IDBDatabaseException - Web APIs
for example, an object, such as an object store or index, already exists and a request attempted to create a new one.
... transaction_inactive_err 7 a request was made against a transaction that is either not currently active or is already finished.
... ver_err 12 a request to open a database with a version lower than the one it already has.

IDBObjectStore.add() - Web APIs
if a record already exists in the object store with the key parameter as its key, then an error constrainerror event is fired on the returned request object.
... constrainterror an insert operation failed because the primary key constraint was violated (due to an already existing record with the same primary key value).
... // this is used a lot below db = dbopenrequest.result; // run the adddata() function to add the data to the database adddata(); }; function adddata() { // create a new object ready to insert into the idb var newitem = [ { tasktitle: "walk dog", hours: 19, minutes: 30, day: 24, month: "december", year: 2013, notified: "no" } ]; // open a read/write db transaction, ready for adding the data var transaction = db.transaction(["todolist"], "readwrite"); // report on the success of the transaction completing, when everything is done transaction.oncomplete = function(e...

IDBRequest: error event - Web APIs
bubbles yes cancelable no interface event event handler property onerror examples this example opens a database and tries to add a record, listening for the error event for the add() operation (this will occur if, for example, a record with the given tasktitle already exists): // open the database const dbopenrequest = window.indexeddb.open('todolist', 4); dbopenrequest.addeventlistener('upgradeneeded', event => { const db = event.target.result; db.onerror = () => { console.log('error creating database'); }; // create an objectstore for this database var objectstore = db.createobjectstore('todolist', { keypath: 'tasktitle' }); // define what data i...
...e: false }); objectstore.createindex('minutes', 'minutes', { unique: false }); objectstore.createindex('day', 'day', { unique: false }); objectstore.createindex('month', 'month', { unique: false }); objectstore.createindex('year', 'year', { unique: false }); }); dbopenrequest.addeventlistener('success', event => { const db = dbopenrequest.result; // open a read/write db transaction, ready for adding the data const transaction = db.transaction(['todolist'], 'readwrite'); const objectstore = transaction.objectstore('todolist'); const newitem = { tasktitle: 'my task', hours: 10, minutes: 10, day: 10, month: 'january', year: 2020 }; const objectstorerequest = objectstore.add(newitem); objectstorerequest.addeventlistener('error', () => { console.log(`error adding new ite...
... 'hours', { unique: false }); objectstore.createindex('minutes', 'minutes', { unique: false }); objectstore.createindex('day', 'day', { unique: false }); objectstore.createindex('month', 'month', { unique: false }); objectstore.createindex('year', 'year', { unique: false }); }; dbopenrequest.onsuccess = event => { const db = dbopenrequest.result; // open a read/write db transaction, ready for adding the data const transaction = db.transaction(['todolist'], 'readwrite'); const objectstore = transaction.objectstore('todolist'); const newitem = { tasktitle: 'my task', hours: 10, minutes: 10, day: 10, month: 'january', year: 2020 }; const objectstorerequest = objectstore.add(newitem); objectstorerequest.onerror = () => { console.log(`error adding new item: ${newitem.tas...

IDBTransaction: error event - Web APIs
bubbles yes cancelable no interface event event handler property onerror examples this example opens a database and tries to add a record, listening for the error event for the add() operation (this will occur if, for example, a record with the given tasktitle already exists): // open the database const dbopenrequest = window.indexeddb.open('todolist', 4); dbopenrequest.onupgradeneeded = (event) => { const db = event.target.result; // create an objectstore for this database const objectstore = db.createobjectstore('todolist', { keypath: 'tasktitle' }); // define what data items the objectstore will contain objectstore.createindex('hours', 'hours'...
..., { unique: false }); objectstore.createindex('minutes', 'minutes', { unique: false }); objectstore.createindex('day', 'day', { unique: false }); objectstore.createindex('month', 'month', { unique: false }); objectstore.createindex('year', 'year', { unique: false }); }; dbopenrequest.onsuccess = (event) => { const db = dbopenrequest.result; // open a read/write db transaction, ready for adding the data const transaction = db.transaction(['todolist'], 'readwrite'); transaction.addeventlistener('error', () => { console.log(`error adding new item: ${newitem.tasktitle}`); }); const objectstore = transaction.objectstore('todolist'); const newitem = { tasktitle: 'my task', hours: 10, minutes: 10, day: 10, month: 'january', year: 2020 }; const objectstorerequest = obje...
...hours', { unique: false }); objectstore.createindex('minutes', 'minutes', { unique: false }); objectstore.createindex('day', 'day', { unique: false }); objectstore.createindex('month', 'month', { unique: false }); objectstore.createindex('year', 'year', { unique: false }); }; dbopenrequest.onsuccess = (event) => { const db = dbopenrequest.result; // open a read/write db transaction, ready for adding the data const transaction = db.transaction(['todolist'], 'readwrite'); transaction.onerror = () => { console.log(`error adding new item: ${newitem.tasktitle}`); }; const objectstore = transaction.objectstore('todolist'); const newitem = { tasktitle: 'my task', hours: 10, minutes: 10, day: 10, month: 'january', year: 2020 }; const objectstorerequest = objectstore.add...

IDBTransactionSync - Web APIs
void abort( ) raises (idbdatabaseexception); exceptions this method can raise an idbdatabaseexception with the following code: non_transient_err if this transaction has already been committed or aborted.
... void commit( ) raises (idbdatabaseexception); exceptions this method can raise an idbdatabaseexception with the following codes: non_transient_err if this transaction has already been committed or aborted.
... objectstore() returns an object store that has already been added to the scope of this transaction.

Key Values - Web APIs
appcommand_media_pause gdk_key_audiopause (0x1008ff31) qt::key_mediapause (0x1000085) keycode_media_pause (127) "mediaplay" starts or continues playing media at normal speed, if not already doing so.
...has no effect if the media is currently stopped already.
... in part form a number of consumer electronics technical specifications: dtv application software environment (part of the atsc specification) open cable application platform 1.1.3 ansi/cea-2014-b: web-based protocol and framework for remote user interface on upnp™ networks and the internet android keyevent key code values note: remote controls typically include keys whose values are already defined elsewhere, such as under multimedia keys or audio control keys.

LockManager.request() - Web APIs
ifavailable optional: if true, the lock request will only be granted if it is not already held.
... signal optional: an abortsignal (the signal property of an abortcontroller); if specified and the abortcontroller is aborted, the lock request is dropped if it was not already granted.
... }); } ifavailable example to grab a lock only if it isn't already being held, use the ifavailable option.

MediaSource.endOfStream() - Web APIs
return value undefined exceptions exception explanation invalidstateerror mediasource.readystate is not equal to open, or one or more of the sourcebuffer objects in mediasource.sourcebuffers are being updated (i.e.
...ew the full demo live, or download the source for further investigation.) var asseturl = 'frag_bunny.mp4'; // need to be specific for blink regarding codecs // ./mp4info frag_bunny.mp4 | grep codec var mimecodec = 'video/mp4; codecs="avc1.42e01e, mp4a.40.2"'; if ('mediasource' in window && mediasource.istypesupported(mimecodec)) { var mediasource = new mediasource; //console.log(mediasource.readystate); // closed video.src = url.createobjecturl(mediasource); mediasource.addeventlistener('sourceopen', sourceopen); } else { console.error('unsupported mime type or codec: ', mimecodec); } function sourceopen (_) { //console.log(this.readystate); // open var mediasource = this; var sourcebuffer = mediasource.addsourcebuffer(mimecodec); fetchab(asseturl, function (buf) { sour...
...cebuffer.addeventlistener('updateend', function (_) { mediasource.endofstream(); video.play(); //console.log(mediasource.readystate); // ended }); sourcebuffer.appendbuffer(buf); }); }; specifications specification status comment media source extensionsthe definition of 'endofstream()' in that specification.

MediaSource - Web APIs
mediasource.readystate read only returns an enum representing the state of the current mediasource, whether it is not currently attached to a media element (closed), attached and ready to receive sourcebuffer objects (open), or attached but the stream has been ended via mediasource.endofstream() (ended.) mediasource.duration gets and sets the duration of the current media being presented.
...r further investigation.) var video = document.queryselector('video'); var asseturl = 'frag_bunny.mp4'; // need to be specific for blink regarding codecs // ./mp4info frag_bunny.mp4 | grep codec var mimecodec = 'video/mp4; codecs="avc1.42e01e, mp4a.40.2"'; if ('mediasource' in window && mediasource.istypesupported(mimecodec)) { var mediasource = new mediasource(); //console.log(mediasource.readystate); // closed video.src = url.createobjecturl(mediasource); mediasource.addeventlistener('sourceopen', sourceopen); } else { console.error('unsupported mime type or codec: ', mimecodec); } function sourceopen (_) { //console.log(this.readystate); // open var mediasource = this; var sourcebuffer = mediasource.addsourcebuffer(mimecodec); fetchab(asseturl, function (buf) { sour...
...cebuffer.addeventlistener('updateend', function (_) { mediasource.endofstream(); video.play(); //console.log(mediasource.readystate); // ended }); sourcebuffer.appendbuffer(buf); }); }; function fetchab (url, cb) { console.log(url); var xhr = new xmlhttprequest; xhr.open('get', url); xhr.responsetype = 'arraybuffer'; xhr.onload = function () { cb(xhr.response); }; xhr.send(); }; specifications specification status comment media source extensionsthe definition of 'mediasource' in that specification.

Using the MediaStream Recording API - Web APIs
checkbox hack for showing/hiding this is fairly well documented already, but we thought we'd give a mention to the checkbox hack, which abuses the fact that you can click on the <label> of a checkbox to toggle it checked/unchecked.
...this is your entry point into using the mediarecorder api — the stream is now ready to be captured into a blob, in the default encoding format of your browser.
... lastly, we use the mediarecorder.stop() method to stop the recording when the stop button is pressed, and finalize the blob ready for use somewhere else in our application.

MediaStream Recording API - Web APIs
the data is delivered by a series of dataavailable events, already in the format you specify when creating the mediarecorder.
... once the source media is playing and you've reached the point where you're ready to record video, call mediarecorder.start() to begin recording.
... your dataavailable event handler gets called every time there's data ready for you to do with as you will; the event has a data attribute whose value is a blob that contains the media data.

Transcoding assets for Media Source Extensions - Web APIs
because the audio codec in the mov container is already aac and the video codec is h.264, we can instruct ffmpeg not to perform transcoding.
... fragmenting if you have an asset that is not already an mp4, ffmpeg can handle emitting a properly fragmented mp4 during the transcode process, with the -movflags frag_keyframe+empty_moov command line flag: $ ffmpeg -i trailer_1080p.mov -c:v copy -c:a copy -movflags frag_keyframe+empty_moov bunny_fragmented.mp4 if you already have an mp4, but it's not properly fragmented, you can again use ffmpeg: $ ffmpeg -i non_fragmented.mp4 -movflags frag_ke...
... summary with your video properly encoded and adaptive bitrate media generated, you're now ready to begin adaptive bitrate streaming on the web using dash and mse.

PaymentRequest.show() - Web APIs
if your architecture doesn't necessarily have all of the data ready to go at the moment it instantiates the payment interface by calling show(), specify the detailspromise parameter, providing a promise that is fulfilled once the data is ready.
... exceptions aborterror the returned promise rejects with an aborterror if the user agent is already showing a payment panel.
... invalidstateerror the promise rejects with an invalidstateerror if the same payment has already been shown for this request (its state is interactive because it is being shown already).

Using the Permissions API - Web APIs
depending on the value of the state property of the permissionstatus object returned when the promise resolves, it reacts differently: "granted" the "enable geolocation" button is hidden, as it isn't needed if geolocation is already active.
... "denied" the "enable geolocation" button is revealed (this code needs to be here too, in case the permission state is already set to denied for this origin when the page is first loaded).
... conclusion and future work at the moment this doesn't offer much more than what we had already.

RTCPeerConnection.addTrack() - Web APIs
the specified track doesn't necessarily have to already be part of any of the specified streams.
... exceptions invalidaccesserror the specified track (or all of its underlying streams) is already part of the rtcpeerconnection.
...compatible reusable rtcrtpsender instances meet these criteria: there is no track already associated with the sender.

RTCPeerConnection.setConfiguration() - Web APIs
you cannot change the identity information for a connection once it's already been set.
... invalidmodificationerror the configuration includes changed identity information, but the connection already has identity information specified.
... example in this example, it has already been determined that ice restart is needed, and that negotiation needs to be done using a different ice server.

Storage Access API - Web APIs
the storage access api is intended to solve this problem; embedded cross-origin content can request unrestricted access to its first-party storage on a site-by-site basis via the document.requeststorageaccess() method, and check whether it already has access via the document.hasstorageaccess() method.
...specifics regarding the lifetime of a storage grant and the circumstances under which the browser may decide to inform the user are currently being worked through and will be announced once ready.
...design properties unique to firefox are summarized here: if the embedded origin tracker.example has already obtained first-party storage access on the top-level origin foo.example, and the user visits a page from foo.example embedding a page from tracker.example again in less than 30 days, the embedded origin will have storage access immediately when loading.

WebGLRenderingContext.makeXRCompatible() - Web APIs
the webglrenderingcontext method makexrcompatible() ensures that the rendering context described by the webglrenderingcontext is ready to render the scene for the immersive webxr device on which it will be displayed.
... if necessary, the webgl layer may reconfigure the context to be ready to render to a different device than it originally was.
... return value a promise which successfully resolves once the webgl context is ready to be used for rendering webxr content.

Using textures in WebGL - Web APIs
// function loadtexture(gl, url) { const texture = gl.createtexture(); gl.bindtexture(gl.texture_2d, texture); // because images have to be download over the internet // they might take a moment until they are ready.
... // load texture const texture = loadtexture(gl, 'cubetexture.png'); mapping the texture onto the faces at this point, the texture is loaded and ready to use.
... once we've set up the texture mapping array, we pass the array into the buffer, so that webgl has that data ready for its use.

A simple RTCDataChannel sample - Web APIs
they make it very easy to chain the steps of the connection process together; if you haven't already read up on this functionality of ecmascript 2015, you should read up on them.
... when the local peer experiences an open or close event, the handlesendchannelstatuschange() method is called: function handlesendchannelstatuschange(event) { if (sendchannel) { var state = sendchannel.readystate; if (state === "open") { messageinputbox.disabled = false; messageinputbox.focus(); sendbutton.disabled = false; disconnectbutton.disabled = false; connectbutton.disabled = true; } else { messageinputbox.disabled = true; sendbutton.disabled = true; connectbutton.disabled = false; disconnectbutton.disabled = ...
... our example's remote peer, on the other hand, ignores the status change events, except for logging the event to the console: function handlereceivechannelstatuschange(event) { if (receivechannel) { console.log("receive channel's status has changed to " + receivechannel.readystate); } } the handlereceivechannelstatuschange() method receives as an input parameter the event which occurred; this will be an rtcdatachannelevent.

Writing WebSocket servers - Web APIs
this article assumes you're already familiar with how http works, and that you have a moderate level of programming experience.
...in many common setups, a reverse proxy has already dealt with them.
... keeping track of clients this doesn't directly relate to the websocket protocol, but it's worth mentioning here: your server must keep track of clients' sockets so you don't keep handshaking again with clients who have already completed the handshake.

Inputs and input sources - Web APIs
picking up an object involves first looking to see if the hand represented by dropping any object already being held in the hand represented by avatar.heldobject[hand].
... if an object is already held in that hand, it's dropped by calling the dropobject() function.
...since we're already rendering the scene on a schedule, we can just add the code to apply these changes there, along with preparing and drawing the scene.

Advanced techniques: Creating and sequencing audio - Web APIs
let bandpass = audioctx.createbiquadfilter(); bandpass.type = 'bandpass'; bandpass.frequency.value = bandhz; // connect our graph noise.connect(bandpass).connect(audioctx.destination); noise.start(); } "dial up" — loading a sound sample it's straightforward enough to emulate phone dial (dtmf) sounds, by playing a couple of oscillators together using the methods we've already looked at, however, in this section, we'll load in a sample file instead so we can take a look at what's involved.
...}); when the sample is ready to play, the program sets up the ui so it is ready to go.
... we could schedule our voices to play within a for loop, however the biggest problem with this is updating whilst it is playing, and we've already implemented ui controls to do so.

Example and tutorial: Simple synth keyboard - Web APIs
osclist is set up to be ready to contain a list of all currently-playing oscillators.
... finally, the oscillator list is initialized to ensure that it's ready to receive information identifiying which oscillators are associated with which keys.
...we look for a data-pressed attribute; if there isn't one (which indicates that the note isn't already playing), we call playtone() to start playing the note, passing in the value of the element's data-frequency attribute.

Background audio processing using AudioWorklet - Web APIs
it also handles creating the audio context if it hasn't already been done.
... in order to ensure the context is usable, this starts by creating the context if it's not already available, then adds the module containing the processor to the worklet.
... you can then create a new audio processor node by simply doing this: let newprocessornode = createmyaudioprocessor(); if the returned value, newprocessornode, is non-null, we have a valid audio context with its hiss processor node in place and ready to use.

Window: popstate event - Web APIs
note: when writing functions that process popstate event it is important to take into account that properties like window.location will already reflect the state change (if it affected the current url), but document might still not.
... if the goal is to catch the moment when the new document state is already fully in place, a zero-delay settimeout() method call should be used to effectively put its inner callback function that does the processing at the end of the browser event loop: window.onpopstate = () => settimeout(dosomething, 0); when popstate is sent when the transition occurs, either due to the user triggering the browser's "back" button or otherwise, the popstate event is near the end of the process to transition to the new location.
... if new-entry's document is already fully loaded and ready—that is, its readystate is complete—and the document is not already visible, it's made visible and the pageshow event is fired at the document with the pagetransitionevent's persisted attribute set to true.

WritableStreamDefaultWriter.WritableStreamDefaultWriter() - Web APIs
exceptions typeerror the provided stream value is not a writablestream, or it is locked to another writer already.
... const list = document.queryselector('ul'); function sendmessage(message, writablestream) { // defaultwriter is of type writablestreamdefaultwriter const defaultwriter = writablestream.getwriter(); const encoder = new textencoder(); const encoded = encoder.encode(message, { stream: true }); encoded.foreach((chunk) => { defaultwriter.ready .then(() => { return defaultwriter.write(chunk); }) .then(() => { console.log("chunk written to sink."); }) .catch((err) => { console.log("chunk error:", err); }); }); // call ready again to ensure that all chunks are written // before closing the writer.
... defaultwriter.ready .then(() => { defaultwriter.close(); }) .then(() => { console.log("all chunks written"); }) .catch((err) => { console.log("stream error:", err); }); } const decoder = new textdecoder("utf-8"); const queuingstrategy = new countqueuingstrategy({ highwatermark: 1 }); let result = ""; const writablestream = new writablestream({ // implement the sink write(chunk) { return new promise((resolve, reject) => { var buffer = new arraybuffer(2); var view = new uint16array(buffer); view[0] = chunk; var decoded = decoder.decode(view, { stream: true }); var listitem = document.createelement('li'); listitem.textcontent = "chunk decoded: " + decoded; list.appendchild(listitem); result += dec...

WritableStreamDefaultWriter - Web APIs
writablestreamdefaultwriter.readyread only returns a promise that resolves when the desired size of the stream's internal queue transitions from non-positive to positive, signaling that it is no longer applying backpressure.
... const list = document.queryselector('ul'); function sendmessage(message, writablestream) { // defaultwriter is of type writablestreamdefaultwriter const defaultwriter = writablestream.getwriter(); const encoder = new textencoder(); const encoded = encoder.encode(message, { stream: true }); encoded.foreach((chunk) => { defaultwriter.ready .then(() => { return defaultwriter.write(chunk); }) .then(() => { console.log("chunk written to sink."); }) .catch((err) => { console.log("chunk error:", err); }); }); // call ready again to ensure that all chunks are written // before closing the writer.
... defaultwriter.ready .then(() => { defaultwriter.close(); }) .then(() => { console.log("all chunks written"); }) .catch((err) => { console.log("stream error:", err); }); } const decoder = new textdecoder("utf-8"); const queuingstrategy = new countqueuingstrategy({ highwatermark: 1 }); let result = ""; const writablestream = new writablestream({ // implement the sink write(chunk) { return new promise((resolve, reject) => { var buffer = new arraybuffer(2); var view = new uint16array(buffer); view[0] = chunk; var decoded = decoder.decode(view, { stream: true }); var listitem = document.createelement('li'); listitem.textcontent = "chunk decoded: " + decoded; list.appendchild(listi...

Synchronous and asynchronous requests - Web APIs
var xhr = new xmlhttprequest(); xhr.open("get", "/bar/foo.txt", true); xhr.onload = function (e) { if (xhr.readystate === 4) { if (xhr.status === 200) { console.log(xhr.responsetext); } else { console.error(xhr.statustext); } } }; xhr.onerror = function (e) { console.error(xhr.statustext); }; xhr.send(null); line 2 specifies true for its third parameter to indicate that the request should be handled asynchronously.
...this handler looks at the request's readystate to see if the transaction is complete in line 4; if it is, and the http status is 200, the handler dumps the received content.
...s done by setting the value of the timeout property on the xmlhttprequest object, as shown in the code below: function loadfile(url, timeout, callback) { var args = array.prototype.slice.call(arguments, 3); var xhr = new xmlhttprequest(); xhr.ontimeout = function () { console.error("the request for " + url + " timed out."); }; xhr.onload = function() { if (xhr.readystate === 4) { if (xhr.status === 200) { callback.apply(xhr, args); } else { console.error(xhr.statustext); } } }; xhr.open("get", url, true); xhr.timeout = timeout; xhr.send(null); } notice the addition of code to handle the "timeout" event by setting the ontimeout handler.

XMLHttpRequest.response - Web APIs
the value is null if the request is not yet complete or was unsuccessful, with the exception that when reading text data using a responsetype of "text" or the empty string (""), the response can contain the response so far while the request is still in the loading readystate (3).
...it works by creating an xmlhttprequest object and creating a listener for readystatechange events such that that when readystate changes to done (4), the response is obtained and passed into the callback function provided to load().
... var url = 'somepage.html'; //a local page function load(url, callback) { var xhr = new xmlhttprequest(); xhr.onreadystatechange = function() { if (xhr.readystate === 4) { callback(xhr.response); } } xhr.open('get', url, true); xhr.send(''); } specifications specification status comment xmlhttprequest living standard whatwg living standard ...

XMLHttpRequest.send() - Web APIs
exceptions exception description invalidstateerror send() has already been invoked for the request, and/or the request is complete.
...}; xhr.send(null); // xhr.send('string'); // xhr.send(new blob()); // xhr.send(new int8array()); // xhr.send(document); example: post var xhr = new xmlhttprequest(); xhr.open("post", '/server', true); //send the proper header information along with the request xhr.setrequestheader("content-type", "application/x-www-form-urlencoded"); xhr.onreadystatechange = function() { // call a function when the state changes.
... if (this.readystate === xmlhttprequest.done && this.status === 200) { // request finished.

XRSystem - Web APIs
onsessionstarted(xrsession); }); } else { // shut down the already running xrsession xrsession.end() .then(() => xrsession = null); } } this code starts by checking to see if webxr is available by looking for the navigator.xr property.
... the onbuttonclicked() function checks to see if there's already a session running.
... if, on the other hand, there is already an ongoing xr session, we instead call end() to end the current session.

Using the alert role - Accessibility
if the element was already in the original source code when the page loaded, the screen reader will announce the error immediately after announcing the page title.
...alert.appendchild(myalerttext); document.body.appendchild(myalert); note: the same result can be achieved with less code when using a script library like jquery: $("<p role='alert'>you must agree with our terms of service to create an account.</p>").appendto(document.body); example 3: adding alert role to an existing element sometimes it's useful to add an alert role to an element that is already visible on the page rather than creating a new element.
...the pseudo code snippet below illustrates this approach: <p id="forminstruction">you must select at least 3 options</p> // when the user tries to submit the form with less than 3 checkboxes selected: document.getelementbyid("forminstruction").setattribute("role", "alert"); example 4: making an element with an alert role visible if an element already has role="alert" and is initially hidden using css, making it visible will cause the alert to fire as if it was just added to the page.

CSS grids, logical values, and writing modes - CSS: Cascading Style Sheets
in these guides, i have already touched on an important feature of grid layout: the support for different writing modes that is built into the specification.
... auto-placement and writing modes in the example already shown, you can see how writing mode changes the direction in which items place themselves onto the grid.
...firefox has already implemented these, so you can try them out right now in firefox.

Relationship of grid layout to other layout methods - CSS: Cascading Style Sheets
in this guide, i will explain how a grid fits together with other techniques you may already be using.
...the two specifications share some common features, however, and if you have already learned how to use flexbox, the similarities should help you get to grips with grid.
...-color: #ffd8a8; padding: 1em; color: #d9480f; } <div class="wrapper"> <div class="box1">one</div> <div class="box2">two</div> <div class="box3">three</div> </div> .wrapper { display: grid; grid-template-columns: repeat(3,1fr); align-items: end; grid-auto-rows: 200px; } .box1 { align-self: stretch; } .box2 { align-self: start; } the fr unit and flex-basis we have already seen how the fr unit works to assign a proportion of available space in the grid container to our grid tracks.

Writing forward-compatible websites - Developer guides
this has happened multiple times to various sites already during the evolution of html5.
...or, conversely, that they don't have support for some other feature (e.g., don't assume that a browser that supports onload on script elements will never support onreadystatechange on them).
...if you have a single code path that works in all the top engines, it means that you are either using features where browser behavior has already converged or, if the behavior hasn't quite converged yet, your code works regardless of which engine's behavior standards turn out to uphold.

<audio>: The Embed Audio element - HTML: Hypertext Markup Language
events event name fired when audioprocess the input buffer of a scriptprocessornode is ready to be processed.
... emptied the media has become empty; for example, this event is sent if the media has already been loaded (or partially loaded), and the load() method is called to reload it.
... playing playback is ready to start after having been paused or delayed due to lack of data.

<input type="number"> - HTML: Hypertext Markup Language
validation we have already mentioned a number of validation features of number inputs, but let's review them now: <input type="number"> elements automatically invalidate any entry that isn't a number (or empty, unless required is specified).
... examples we've already covered the fact that by default, the increment is 1, and you can use the step attribute to allow decimal inputs.
...inches">inches:</label> <input id="inches" type="number" name="inches" min="0" max="11" step="1"> <span class="validity"></span> </div> <div> <input type="button" class="meters" value="enter height in feet and inches"> </div> <div> <input type="submit" value="submit form"> </div> </form> you'll see that we are using many of the attributes we've already looked at in the article earlier on.

<video>: The Video Embed element - HTML: Hypertext Markup Language
events event name fired when audioprocess the input buffer of a scriptprocessornode is ready to be processed.
... emptied the media has become empty; for example, this event is sent if the media has already been loaded (or partially loaded), and the load() method is called to reload it.
... playing playback is ready to start after having been paused or delayed due to lack of data.

HTTP Index - HTTP
218 100 continue http, informational, status code the http 100 continue informational status response code indicates that everything so far is ok and that the client should continue with the request or ignore it if it is already finished.
... 264 503 service unavailable 503 error, http, server error, status code the hypertext transfer protocol (http) 503 service unavailable server error response code indicates that the server is not ready to handle the request.
... 272 protocol upgrade mechanism guide, http, http/2, networking, protocols, upgrade, websocket, websockets the http/1.1 protocol provides a special mechanism that can be used to upgrade an already established connection to a different protocol, using the upgrade header field.

HTTP Public Key Pinning (HPKP) - HTTP
when the client visits the server again, it expects at least one certificate in the certificate chain to contain a public key whose fingerprint is already known via hpkp.
...this allows for changing the server's public key without breaking accessibility for clients that have already noted the pins.
... setenv.add-response-header = ( "public-key-pins" => "pin-sha256=\"base64+primary==\"; pin-sha256=\"base64+backup==\"; max-age=5184000; includesubdomains") note: this requires the mod_setenv server.module loaded which can be included by the following if not already loaded.

HTTP response status codes - HTTP
information responses 100 continue this interim response indicates that everything so far is ok and that the client should continue the request, or ignore the response if the request is already finished.
... 208 already reported (webdav) used inside a <dav:propstat> response element to avoid repeatedly enumerating the internal members of multiple bindings to the same collection.
... 503 service unavailable the server is not ready to handle the request.

Promise.race() - JavaScript
if the iterable contains one or more non-promise value and/or an already settled promise, then promise.race will resolve to the first of these values found in the iterable.
... examples asynchronicity of promise.race this following example demonstrates the asynchronicity of promise.race: // we are passing as argument an array of promises that are already resolved, // to trigger promise.race as soon as possible var resolvedpromisesarray = [promise.resolve(33), promise.resolve(44)]; var p = promise.race(resolvedpromisesarray); // immediately logging the value of p console.log(p); // using settimeout we can execute code after the stack is empty settimeout(function(){ console.log('the stack is now empty'); console.log(p); }); // logs, in order: // promise { <state>: "pending" } // the stack is now empty // promise { <state>: "fulfilled", <value>: 33 } an empty iterable causes the returned promise to be forever pending: var foreverpendingpromise = promise...
....race([]); console.log(foreverpendingpromise); settimeout(function(){ console.log('the stack is now empty'); console.log(foreverpendingpromise); }); // logs, in order: // promise { <state>: "pending" } // the stack is now empty // promise { <state>: "pending" } if the iterable contains one or more non-promise value and/or an already settled promise, then promise.race will resolve to the first of these values found in the array: var foreverpendingpromise = promise.race([]); var alreadyfulfilledprom = promise.resolve(100); var arr = [foreverpendingpromise, alreadyfulfilledprom, "non-promise value"]; var arr2 = [foreverpendingpromise, "non-promise value", promise.resolve(100)]; var p = promise.race(arr); var p2 = promise.race(arr2); console.log(p); console.log(p2); settimeout(functio...

async function - JavaScript
this runs 2 seconds after 1., immediately after 2., since fast is already resolved } function concurrentpromise() { console.log('==concurrent start with promise.all==') return promise.all([resolveafter2seconds(), resolveafter1second()]).then((messages) => { console.log(messages[0]) // slow console.log(messages[1]) // fast }) } async function parallel() { console.log('==parallel with await promise.all==') // start 2 "jobs" in parallel and wait for b...
...the second timer is not created until the first has already fired, so the code finishes after 3 seconds.
...ows: async function getprocesseddata(url) { let v try { v = await downloaddata(url) } catch(e) { v = await downloadfallbackdata(url) } return processdatainworker(v) } in the above example, notice there is no await statement after the return keyword, although that would be valid too: the return value of an async function is implicitly wrapped in promise.resolve - if it's not already a promise itself (as in this example).

Performance fundamentals - Web Performance
then when the data is needed later, hopefully it's already available and the application doesn't have to wait.
...this in turn means they "start up" faster (since they are already running) and have better upp.
...this waits until the browser is actually ready to start building the next frame of your animation, and won't bother if the hardware isn't going to actually draw anything.

Add to Home screen - Progressive web apps (PWAs)
how do you make an app a2hs-ready?
...you could also decide to include different types of icons so devices can use the best one they are able to (e.g., chrome already supports the webp format).
... if the user selects install, the app is installed (available as standalone desktop app), and the install button no longer shows (the onbeforeinstallprompt event no longer fires if the app is already installed).

Mobile first - Progressive web apps (PWAs)
mobile constraints we have already mentioned the fact that mobiles generally have less memory, processing power and bandwidth than other devices (although bear in mind that smart tvs are also generally pretty low powered.) they also have less viewport size available.
...i installed the volo automation tool by running the following on the command line sudo npm install -g volo (you'll also need to get node.js too if you don't already have it) i then created my sample project using volo create myapp mozilla/mortar-app-stub this creates a sample project inside a directory called myapp.
... volo build: builds a minified code version of your app, ready for production deployment, in a www-built folder.

Using templates and slots - Web Components
al quick example: <template id="my-paragraph"> <p>my paragraph</p> </template> this won't appear in your page until you grab a reference to it with javascript and then append it to the dom, using something like the following: let template = document.getelementbyid('my-paragraph'); let templatecontent = template.content; document.body.appendchild(templatecontent); although trivial, you can already start to see how this could be useful.
...however, it is generally more practical to add slots within a <template> element, since you are unlikely to need to define a pattern based on an already-rendered element.
... in addition, even if it is not already rendered, the purpose of the container as a template should be more semantically clear when using the <template>.

Loading Content Scripts - Archive of obsolete content
the constructors for content-script-using objects such as panel and page-mod define a group of options for loading content scripts: contentscript string, array contentscriptfile string, array contentscriptwhen string contentscriptoptions object we have already seen the contentscript option, which enables you to pass in the text of the script itself as a string literal.
... "ready" loads the scripts after the dom for the page has been loaded: that is, at the point the domcontentloaded event fires.

Communicating using "port" - Archive of obsolete content
here's a simple add-on that sends a message to a content script using port: var tabs = require("sdk/tabs"); var alertcontentscript = "self.port.on('alert', function(message) {" + " window.alert(message);" + "})"; tabs.on("ready", function(tab) { worker = tab.attach({ contentscript: alertcontentscript }); worker.port.emit("alert", "message from the add-on"); }); tabs.open("http://www.mozilla.org"); in total, the port object defines four functions: emit(): emit a message.
... due to bug 816272 the page-mod's removelistener() function does not prevent the listener from receiving messages that are already queued.

context-menu - Archive of obsolete content
if the item is already contained in another menu or in the top-level context menu, it's automatically removed first.
... if the item is already contained in this menu it will just be moved to the end of the menu.

simple-storage - Archive of obsolete content
for example, this add-on tries to store the urls of pages the user visits: var ss = require("sdk/simple-storage"); ss.storage.pages = []; require("sdk/tabs").on("ready", function(tab) { ss.storage.pages.push(tab.url); }); require("sdk/ui/button/action").actionbutton({ id: "read", label: "read", icon: "./read.png", onclick: function() { console.log(ss.storage.pages); } }); but this isn't going to work, because it empties the array each time the add-on runs (for example, each time firefox is started).
... line 2 needs to be made conditional, so the array is only constructed if it does not already exist: if (!ss.storage.pages) ss.storage.pages = []; deleting data you can delete properties using the delete operator.

content/loader - Archive of obsolete content
e/hidden-frame"); var { loader } = require("sdk/content/content"); var pageloader = loader.compose({ constructor: function pageloader(options) { options = options || {}; if (options.contenturl) this.contenturl = options.contenturl; this.on('propertychange', this._onchange = this._onchange.bind(this)); let self = this; hiddenframes.add(hiddenframes.hiddenframe({ onready: function onready() { let frame = self._frame = this.element; self._emit('propertychange', { contenturl: self.contenturl }); } })); }, _onchange: function _onchange(e) { if ('contenturl' in e) this._frame.setattribute('src', this._contenturl); } }); loader properties contentscriptfile the local file urls of content scripts to load.
...this may take one of the following values: "start": load content scripts immediately after the document element for the page is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) for the page has been loaded, at the time the window.onload event fires contentscriptoptions read-only value exposed to content scripts under self.options property.

content/symbiont - Archive of obsolete content
this may take one of the following values: "start": load content scripts immediately after the document element for the page is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) for the page has been loaded, at the time the window.onload event fires this property is optional and defaults to "end".
...this may have one of the following values: "start": load content scripts immediately after the document element for the page is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) for the page has been loaded, at the time the window.onload event fires contentscriptoptions read-only value exposed to content scripts under self.options property.

io/byte-streams - Archive of obsolete content
if the stream is already closed, an exception is thrown.
...if the stream is already closed, an exception is thrown.

Release notes - Archive of obsolete content
added tab.readystate.
... added a ready event to sidebars.

jpm - Archive of obsolete content
you can sign an xpi you've already generated by passing the xpi file in the --xpi argument, like this: jpm sign --api-key ${jwt_issuer} --api-secret ${jwt_secret} --xpi <xpi file> alternatively, you can omit the --xpi argument, in which case jpm sign will generate an xpi from the current directory (or --addon-dir).
... your add-on at this exact version number already exists, so it was not signed.

Creating annotations - Archive of obsolete content
updating main.js go back to main.js and add the code to create the selector into the main function: var selector = pagemod.pagemod({ include: ['*'], contentscriptwhen: 'ready', contentscriptfile: [data.url('jquery-1.4.2.min.js'), data.url('selector.js')], onattach: function(worker) { worker.postmessage(annotatorison); selectors.push(worker); worker.port.on('show', function(data) { console.log(data); }); worker.on('detach', function () { detachworker(this, selectors); }); } }); make sure the name you use ...
...so edit the message handler assigned to the selector so that on receiving the show message we assign the content of the message to the panel using a new property annotationanchor, and show the panel: var selector = pagemod.pagemod({ include: ['*'], contentscriptwhen: 'ready', contentscriptfile: [data.url('jquery-1.4.2.min.js'), data.url('selector.js')], onattach: function(worker) { worker.postmessage(annotatorison); selectors.push(worker); worker.port.on('show', function(data) { annotationeditor.annotationanchor = data; annotationeditor.show(); }); worker.on('detach', function () { detachworker(this, se...

Storing annotations - Archive of obsolete content
var annotationlist = panels.panel({ width: 420, height: 200, contenturl: data.url('list/annotation-list.html'), contentscriptfile: [data.url('jquery-1.4.2.min.js'), data.url('list/annotation-list.js')], contentscriptwhen: 'ready', onshow: function() { this.postmessage(simplestorage.storage.annotations); }, onmessage: function(message) { require('sdk/tabs').open(message); } }); since this panel's content script uses jquery we will pass that in too: again, make sure the name of it matches the version of jquery you downloaded.
... finally we need to connect this to the widget's right-click message: var widget = widgets.widget({ id: 'toggle-switch', label: 'annotator', contenturl: data.url('widget/pencil-off.png'), contentscriptwhen: 'ready', contentscriptfile: data.url('widget/widget.js') }); widget.port.on('left-click', function() { console.log('activate/deactivate'); widget.contenturl = toggleactivation() ?

Getting started (cfx) - Archive of obsolete content
navigate to it, type cfx init, and hit enter: mkdir my-addon cd my-addon cfx init you'll see some output like this: * lib directory created * data directory created * test directory created * doc directory created * readme.md written * package.json written * test/test-main.js written * lib/main.js written * doc/main.md written your sample add-on is now ready for testing: try "cfx test" and then "cfx run".
... packaging the add-on when you've finished the add-on and are ready to distribute it, you'll need to package it as an xpi file.

Listen for Page Load - Archive of obsolete content
the following add-on listens to the tab's built-in ready event and just logs the url of each tab as the user loads it: require("sdk/tabs").on("ready", logurl); function logurl(tab) { console.log(tab.url); } you will find this console output in the browser console, not the web console.
...the script adds a red border to the tab's document: require("sdk/tabs").on("ready", runscript); function runscript(tab) { tab.attach({ contentscript: "if (document.body) document.body.style.border = '5px solid red';" }); } (this example is only to show the idea: to implement something like this, you should instead use page-mod, and specify "*" as the match-pattern.) learning more to learn more about working with tabs in the sdk, see the tabs api reference.

Open a Web Page - Archive of obsolete content
the callback is assigned to the onready property, and will be passed the tab as an argument: var tabs = require("sdk/tabs"); tabs.open({ url: "http://www.example.com", onready: function onready(tab) { console.log(tab.title); } }); even then, you don't get direct access to any content hosted in the tab.
...this add-on loads a page, then attaches a script to the page which adds a red border to it: var tabs = require("sdk/tabs"); tabs.open({ url: "http://www.example.com", onready: runscript }); function runscript(tab) { tab.attach({ contentscript: "document.body.style.border = '5px solid red';" }); } learning more to learn more about working with tabs in the sdk, see the tabs api reference.

Bookmarks - Archive of obsolete content
checking to see if a uri is bookmarked if you want to see if a given uri is already bookmarked -- for example, to avoid creating a new bookmark for a site that's already bookmarked -- you can use the nsinavbookmarksservice.isbookmarked() method.
... var ios = components.classes["@mozilla.org/network/io-service;1"] .getservice(components.interfaces.nsiioservice); var uri = ios.newuri("http://mozilla.com/", null, null); if (!bmsvc.isbookmarked(uri)) { bmsvc.insertbookmark(bmsvc.toolbarfolder, uri, bmsvc.default_index, "mozilla"); } this example looks to see if the user already has a bookmark for the mozilla web site, and, if not, creates one, adding it to the user's bookmarks toolbar.

JavaScript Daemons Management - Archive of obsolete content
onstart.call(this.owner, this.index, this.length, this.backw); } this.synchronize(); return true; }; daemon.prototype.stop = function () { this.pause(); if (this.onstop) { this.onstop.call(this.owner, this.index, this.length, this.backw); } delete this.index; delete this.backw; delete this.reversals; }; /******************************* * daemon is now ready!
...n; } cleartimeout(this.session); this.session = settimeout(daemon.safe.forcecall, this.rate, this); }; daemon.safe.prototype.pause = function () { cleartimeout(this.session); this.paused = true; }; /* system not required daemon.safe instances methods */ /* [inherited from daemon.prototype] */ /**************************************** * the safe-daemon is now ready!

Toolbar - Archive of obsolete content
adding a toolbar button there are two tutorials available: an elaborate step by step tutorial for beginners: custom toolbar button a tutorial describing the steps needed to add a toolbar button assuming you already have a working extension and know the basics of extension development: creating toolbar buttons adding button by default when you create and deploy your extension and include a toolbar button for it by overlaying the customize toolbarpalette, it is not available by default.
... /** * installs the toolbar button with the given id into the given * toolbar, if it is not already present in the document.

Extension Etiquette - Archive of obsolete content
it assumes that you are already familiar with building an extension.
... theming if you have xul buttons in your extension that do functions similar to ones that already exist in a browser — for example, a feed reader that reloads and stops — use icons from the browser's theme.

Chapter 6: Firefox extensions and XUL applications - Archive of obsolete content
this.stack = new array(); }, push: function(val) { this.stack.push(number(val)); }, _letfunc: function(func) { a = this.pop(); b = this.pop(); this.push(func(a, b)); }, plus: function() { return this._letfunc(this._plus); }, _plus: function(a, b) { return a + b; }, pop: function() { return this.stack.pop(); } } check for errors now you’re ready for your first test.
... in initwithpath, the nsilocalfile object gets initialized, and any information already in it gets reset.

Chapter 5: Let's build a Firefox extension - Archive of obsolete content
we’ve already covered the dialog element in chapter 3.
...since you’ve already got the development version of the hello world extension running as a test install on your current profile, restart firefox under a different profile (see footnote 1).

Appendix C: Avoiding using eval in Add-ons - Archive of obsolete content
closures will ensure the code is still valid, even if your outer function already returned from execution.
... someexistingobject.someproperty = "abc"; // we already demonstrated with with functions in a previous example alternative: object.defineproperty() for most objects it is possible to (re-)define properties with the object.defineproperty() api, which allows to not override values, but also lets you define getters and setters.

XPCOM Objects - Archive of obsolete content
the getservice and createinstance methods allow you to get the component already set to an interface.
... const cc = components.classes; const ci = components.interfaces; const cr = components.results; const ce = components.exception; you should be familiar with this already, although there are a couple of additions, components.results and components.exception.

Firefox addons developer guide - Archive of obsolete content
there should be some introductory text on the table of contents page at https://developer.mozilla.org/en/firefox_addons_developer_guide obviously there are a number of fixme items in the content that need dealing with, but those are already known.
...there already is a tutorial for beginners: building an extension.

Inner-browsing extending the browser navigation paradigm - Archive of obsolete content
iframes are already a very well established standard, and are implemented with the same functionalities in all modern browsers.
...when the markup is ready, it copies the markup into the container element, which is a div element.

JXON - Archive of obsolete content
if you have already have a dom tree from using xmlhttprequest, skip to the next paragraph.
...ng(omyhtmldoc)): <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title>my html document</title> <script type="text/javascript"> alert("welcome!"); </script> <style> p:first-letter { font: italic bold 30px georgia, serif; } </style> </head> <body> <h1>my html document</h1> <p>hello world!!</p> </body> </html> note: as we already said in the note within code considerations, despite the bidirectional conversion between xml and json is lossless regarding the whole content and the structure of an xml document, it is not lossless regarding the ordering of elements, which for some xml dialects (like xhtml) is part of the information.

MCD, Mission Control Desktop, AKA AutoConfig - Archive of obsolete content
$ export nspr_log_modules=mcd:5 $ export nspr_log_file=/tmp/thunderbird-log.txt when thunderbird has started, you should read: $ cat /tmp/thunderbird-log.txt -1209403040[808a788]: general.config.filename = thunderbird.cfg -1209403040[808a788]: evaluating .cfg file thunderbird.cfg with obscurevalue 0 clean then, to be sure to start with a fresh thunderbird account, don't do this if you already have one and want to preserve your emails and preferences!
...beware that in windows, that file is already there, so it must be saved before being replaced by ours, in order to come back to a normal state in case of problem.

Developing New Mozilla Features - Archive of obsolete content
life will be much easier if your team has one or more members who are already familiar with and to the mozilla world.
... if it is not possible to submit your feature in manageable size patches and you submit a 500k patch, be prepared for several months of review and revision before the patch is ready to be checked in it may not take this long.

Embedding Mozilla in a Java Application using JavaXPCOM - Archive of obsolete content
if your code cannot find the gre and keeps throwing filenotfoundexceptions during the getgrepathwithproperties(...) call, check whether you already registered the gre on your system: gre registration the initembedding method kicks off the embedding process, allowing the java application to work with xpcom and mozilla.
... another example: (taken from rayh.co.uk) // note, on linux, gtk has to be already initialized for this code to work mozilla moz = mozilla.getinstance(); // now we need to start an xul application, so we get an instance of the xpcom service manager nsiservicemanager servicemanager = moz.getservicemanager(); // now we need to get the @mozilla.org/toolkit/app-startup;1 service: nsiappstartup appstartup = (nsiappstartup)servicemanager.getservicebycontrac...

Layout System Overview - Archive of obsolete content
in the normal in-flow case this is quite natural because the sequential addition of new content results in sequential addition of new frames, and because everything is in-flow, the new frames do not influence the geometry of the frames that have already been formatted.
...sometimes a content element comes in incrementally, and invalidates the formatting of some of the frames that precede it, frame that have already been formatted.

importUserCertificates - Archive of obsolete content
however, if this certificate has the same dn as one or more certificates that already exist in the user's certificate store, the nickname associated with the certificate(s) of the same dn in the certificate store is used, and the <tt>"nicknamestring"</tt> parameter is ignored.
...the private key for the certificates must already reside in the user's personal private key database.

Twitter - Archive of obsolete content
when you call a method that requires authentication -- such as jetpack.lib.twitter.statuses.update() -- without providing a username or password, firefox will prompt the user for them if she is not already authenticated with twitter.
... example usage tweeting jetpack.lib.twitter.statuses.update({ status: "o frabjous day!" }); firefox will prompt for a username and password if the user is not already authenticated with twitter.

Tabs - Archive of obsolete content
blah(lengthstringfocusedstringtostringstringpopstringpushstringreversestringshiftstringsortstringsplicestringunshiftstring)this is some default text lengththe number of open tabsstring focusedthe current tab in your browserstring tostringstuffstring popstuffstring pushstuffstring reversestuffstring shiftstuffstring sortstuffstring splicestuffstring unshiftstuffstring onready()when the inherited document is fully loaded.
...tp://www.example.com/"); blah(lengthstringfocusedstringtostringstringpopstringpushstringreversestringshiftstringsortstringsplicestringunshiftstring)this is some default text lengththe number of open tabsstring focusedthe current tab in your browserstring tostringstuffstring popstuffstring pushstuffstring reversestuffstring shiftstuffstring sortstuffstring splicestuffstring unshiftstuffstring onready()when the inherited document is fully loaded.

slideBar - Archive of obsolete content
jetpack.future.import("slidebar"); methods append(iconurihtmlhtml/xmlurluriwidthintpersistboolautoreloadboolonclickfunctiononselectfunctiononreadyfunction)this is a list of options to specify modifications to your slidebar instance.
...iconhref oficon to show in the slidebaruri htmlhtml content for the featurehtml/xml urlurl to load content for the featureuri widthwidth of the content area and the selected slide sizeint persistdefault slide behavior when being selectedbool autoreloadautomatically reload content on selectbool onclickcallback when the icon is clickedfunction onselectcallback when the feature is selectedfunction onreadycallback when featured is loadedfunction an example: jetpack.slidebar.append({ url: "http://mozilla.com", width: 150, onclick: function(slide){ slide.icon.src = "chrome://branding/content/icon48.png"; }}); ...

statusBar - Archive of obsolete content
onready (event) occurs when the item was loaded onunload (event) triggers when the item was removed.
... example jetpack.statusbar.append({ html: 'hello <i>world</i>!', onready: function(widget){ $(widget).click(function(){ jetpack.tabs.open("http://www.jogkey.de"); }); } }); ...

Migrate apps from Internet Explorer to Mozilla - Archive of obsolete content
for example, the following code assumes that the div node already exists in the dom by the time the script block executes: ...
... int readystate state of the request.

How to Write and Land Nanojit Patches - Archive of obsolete content
once the patch seems ready, copy it to the other two repositories and test it.
...then find the corresponding bug(s) and commit the (hopefully already-reviewed!) tr/tm portion of the patch(es) on top of your current, un-pushed tip.

Running Tamarin acceptance tests - Archive of obsolete content
if you've correctly edited and run the android-vars.sh script mentioned on the tamarin build documentation page you should already be pathed to the adb executable in the public sdk/ndk, but if not it exists at /android-public/android-sdk-mac_86/platform-tools.
...the shell can be named variously in the build but on the phone the executable must be 'avmshell' $ adb shell 'mkdir /data/local/tamarin' $ adb push avmshell /data/local/tamarin/avmshell $ adb shell 'chmod 777 /data/local/tamarin/avmshell' copy android_runner.sh, if it doesn't already exist on the phone in /data/local/tamarin $ adb push tamarin-redux/platform/android/android_runner.sh /data/local/tamarin/android_runner.sh $ adb shell 'chmod 777 /data/loca/android_runner.sh' test it out with a simple .abc or no args for usage (should return exitcode=0) $ tamarin-redux/platform/android/android_shell.py hello.abc hello exitcode=0 test it out by retrieving the version information...

Running Tamarin performance tests - Archive of obsolete content
if you've correctly edited and run the android-vars.sh script mentioned on the tamarin build documentation page you should already be pathed to the adb executable in the public sdk/ndk, but if not it exists at /android-public/android-sdk-mac_86/platform-tools.
...the shell can be named variously in the build but on the phone the executable must be 'avmshell' $ adb push avmshell /data/app/avmshell $ adb shell chmod 777 /data/app/avmshell copy android_runner.sh, if it doesn't already exist on the phone in /data/app $ adb push tamarin-redux/platform/android/android_runner.sh /data/app/android_runner.s $ adb shell chmod 777 /data/app/android_runner.sh test it out with a simple .abc or no args for usage (should return exitcode=0) $ tamarin-redux/platform/android/android_shell.h hello.abc hello exitcode=0 running performance tests to run performance tests on android you don't nee...

URIs and URLs - Archive of obsolete content
it also might be necessary to implement a new urlparser for a new protocol but that might not be necessary because necko already provides uri implementations that can deal with a number of schemes, by implementing the generic urlparser defined in rfc 2396.
...necko will not escape an already escaped character unless forced by a special mask that can be used if it is known that a string is not escaped.

Using cross commit - Archive of obsolete content
getting the script "make -f client.mk pull_all" from a working copy of the trunk now pulls cross-commit, and that'll work on the 1.8 branch soon, too, so you might already have the script.
...ommon ways to use cross-commit: land something simultaneously on the trunk and mozilla_1_8_branch # modify the files (probably by applying the patch) patch -p0 < ~/caret.patch # commit on trunk and branch at once # make sure to use -m "commit message" when doing so tools/cross-commit -m "fix some sort of security bug" layout/base/nscaret.h land something on two other branches that has already landed on the trunk # update to the first branch you want to land on cvs update -rmozilla_1_8_branch layout/base/nscaret.h # modify the files (probably by applying the patch) patch -p0 < ~/caret.patch # commit on all the branches at once # make sure to use -m "commit message" when doing so tools/cross-commit --moz18 --branch mozilla_1_8_0_branch -m "fix some sort of security bug" layout...

Install script template - Archive of obsolete content
* you should not stop the install process because the function failed, * you still have a chance to install the plugin for the already * installed gecko browsers.
... * you should not stop the install process because the function failed, * you still have a chance to install the plugin for the already * installed gecko browsers.

Return Codes - Archive of obsolete content
filename_already_used -226 same filename being used in install install_cancelled -227 raised when installation is cancelled in medias res.
... download_error -228 problem with download script_error -229 error in the script already_exists -230 file already exists locally is_file -231 expected target directoy and got file source_does_not_exist -232 source file/dir not found source_is_directory -233 expected source file and got directory source_is_file -234 expected source directory and got file insufficient_disk_space -235 not enough disk space for install filename_too_long -236 unable_to_locate_lib_function -237 unable_to_load_library ...

XPJS Components Proposal - Archive of obsolete content
it will load that .js file (if not already loaded) and call the nsgetfactory function.
... so when will it be ready?

Working With Directories - Archive of obsolete content
if the directory already exists, then no action is taken.
...naturally, if the 'myfiles' directory already exists, it won't be recreated.

Index - Archive of obsolete content
web developers already familiar with dynamic html (dhtml) will learn xul quickly and can start building applications right away.
... 1028 features of a window guide, tutorials, xul, xul tutorial we've already seen some features of windows.

Introduction to XUL - Archive of obsolete content
we intend to provide a subset of cross-platform functionality suitable for building network applications like browsers, leveraging the cross-platform functionality already built into gecko, mozilla's html layout engine.
... "xul" already introduced, is an application of xml used to describe the layout of most windows in the mozilla browser, including and especially the main, browser window.

Introduction - Archive of obsolete content
if the datasource is already loaded and cached, the template builder can begin work right away.
...if the datasource is already loaded, the builder can construct content all in one step, although even this isn't completely true as we'll see later.

Multiple Queries - Archive of obsolete content
how multiple queries are processed we already know that a query generates a set of results.
...that is, the canal.jpg generated by the second query is removed, since an earlier query (the first query) already generated a match for that result.

Static Content - Archive of obsolete content
instead, it looks to see if a menupopup already exists in the location where it would be generated.
...the builder will treat the element as already present as long as some element with the same tag name exists.

Template Builder Interface - Archive of obsolete content
the only difference is that the datasource has already loaded so the data will be the same.
...note that if one of the datasources is already loaded it will not be loaded again.

The Joy of XUL - Archive of obsolete content
web developers already familiar with dynamic html (dhtml) will learn xul quickly and can start building applications right away.
... fortunately, an implementation of the libical library was already available for macintosh so, with the cross platform nature of xpcom, a macintosh calendar implementation was working within a few days.

Adding Style Sheets - Archive of obsolete content
all the xul examples so far have actually been using a style sheet already.
... importing style sheets we've already seen how to import style sheets for use.

Broadcasters and Observers - Archive of obsolete content
command attribute forwarding we've already seen that elements such as buttons can be hooked up to commands.
...the checkbox already has a label, however, it will be overridden by the command's label.

Commands - Archive of obsolete content
in addition, text fields and other widgets have a number of commands which they already support that you can invoke.
...you will probably want to use the same id if a command is already being used, however, for your own commands, you can use any command id you wish.

Creating a Skin - Archive of obsolete content
some of the rules conflict with those already in the global stylesheets.
... for example, rules are already defined for buttons and tabs and so on and we defined additional rules for them.

Modifying a XUL Interface - Archive of obsolete content
note that for all these functions, the object referred to by the variable referencechild or the variables newchild and oldchild must already exist or an error occurs.
... likewise the object referred to by the variable child which is to be removed must already exist or an error occurs.

Tree Box Objects - Archive of obsolete content
redrawing the tree we already saw the rowcountchanged() function of the tree box object in the previous section.
... the ensurerowisvisible() function will scroll to a row just as scrolltorow() does, but does not scroll if the row is already visible.

Using Visual Studio as your XUL IDE - Archive of obsolete content
as you are already there, you can do the same for "xbl".
...if you already have a xml or xul file opened, visual studio will add the menu item xml to the main menu.

XUL accessibility guidelines - Archive of obsolete content
when creating an extension (for firefox or another xul application), make sure the keyboard shortcuts you assign do not interfere with those already defined by the base application.
... other issues custom widgets avoid re-creating functionality that already exists.

XUL accessibility tool - Archive of obsolete content
be aware that the report might take a little while to be ready depending on the complexity of the application being analyzed and the speed of your machine.
... future work the following things have been suggested or are planned for a future version of the tool: new tests: (aaronlev) warning: hardcoded color and pixel sizings (aaronlev) error: duplicate accesskey in a dialog (already have this for menus) (aaronlev) error: form control without accesskey (aaronlev) warning: accesskey as lowercase letter with descender (underlined g,j,y,q,p are hard to read, not recommended) (aaronandy) list of things to check manually, such as a list oftrees in the document (make sure they have accessible column picker equivs) or a list of toolbarbuttons (make sure they have accessible alternatives).

Creating XULRunner Apps with the Mozilla Build System - Archive of obsolete content
makefile.in - didn't we already do this one?
...just walking the mozilla tree to build xulrunner can take a fair amount of time, even if it has already been built and the sources haven't changed.

XULRunner FAQ - Archive of obsolete content
it is already possible to run firefox on xulrunner now though and certain linux distributions already do this.
...please search to make sure that your bug has not already been reported.

MacFAQ - Archive of obsolete content
here's how to implement command-line trapping when the app is already running, without getting into appleevents or c++ code.
... taking advantage of the core code "openurl" from "nscommandlineservicemac.cpp", you'll see that it looks for "browser.chromeurl" before defaulting to navigator.xul, and this is called when an xulrunner app is already running, so: create a default preference of "browser.chromeurl" that points to your new "hiddenwindow" as such: "chrome://myxul/content/hiddenwindow.xul" next take the code below and drop it in, to create the hiddenwindow.xul (note: the debug function and nsicommandline try/catch can be removed, all you need is the window.arguments[0]) <?xml version="1.0"?> <window xmlns="http://www.mozilla.org/keymaster/g...

2006-10-06 - Archive of obsolete content
ffx 2 rc2 testing today l10n builds were completed was completed and ready for test.
... calendar localization update rc1 for sunbird 0.3 is out now and ready for testing.

2006-11-10 - Archive of obsolete content
the blog will be hosted at quality.mozilla.org until qmo is ready for primetime.
...he thinks he found a bug and needs to confirm if it's filed already?

NPN_GetURL - Archive of obsolete content
the default is _self, if the plug-in instance's document is already at the top.
...if target is null, the application creates a new stream and delivers the data to the plug-in instance, through calls to npp_newstream(), npp_writeready() and npp_write(), and npp_destroystream().

NPAPI plugin reference - Archive of obsolete content
this initiates a read operation; the actual data is received through subsequent calls to npp_writeready() and npp_write().
...(remark: hence the name "npp_write" is misleading - just think of:"data_arrived") npp_writeready determines maximum number of bytes that the plug-in can consume.

Introduction to Public-Key Cryptography - Archive of obsolete content
figure 4 assumes the following: the user has already decided to trust the server, either without authentication or on the basis of server authentication via ssl.
... like figure 4, figure 5 assumes that the user has already decided to trust the server and has requested a resource, and that the server has requested client authentication in the process of evaluating whether to grant access to the requested resource.

Writing JavaScript for XHTML - Archive of obsolete content
this will ensure that documents in html will compare correctly and will do no harm in xhtml where the names are already lower case.
... we found out already, that the document object in xml files is different from the ones in html files.

Building Mozilla XForms - Archive of obsolete content
firefox 3.5 and up: get the source code if you want to build xforms for firefox up to 3.0, you already have the required source code, it's part of your cvs checkout.
...$topsrcdir/browser/config/mozconfig mk_add_options moz_co_project=browser mk_add_options moz_objdir=@topsrcdir@/obj-@config_guess@ ac_add_options --enable-extensions="default,xforms" ac_add_options --enable-debug ac_add_options --disable-optimize ac_add_options --disable-tests building now that you have everything ready, you can rebuild mozilla with the same command you used before to build firefox without xforms.

Implementation Status - Archive of obsolete content
278448; 338146; 4.2 initialization events supported 4.2.1 xforms-model-construct supported 4.2.2 xforms-model-construct-done supported 4.2.3 xforms-ready supported 4.2.4 xforms-model-destruct supported 4.3.1 xforms-rebuild supported 4.3.2 xforms-recalculate supported 4.3.3 xforms-revalidate supported 4.3.4 xforms-refresh supp...
...xpath expressions in xforms section title status notes bugs 7.1 xpath datatypes supported 7.2 evaluation context partial 7.3 references, dependencies, and dynamic dependencies partial we probably already do most of it due to our 1.0 work, but we haven't verified we meet the 1.1 standards, yet 7.4 expression categories supported 7.4.2 model binding expressions and computed expressions supported 7.4.3 expressions in actions and submissions partial ...

Anatomy of a video game - Game development
before we discuss ways to change it, let us discuss what it already does well.
... sleep (unless an event interrupts the browser's nap) until the monitor is ready for your image (vsync) and repeat.

WebVR — Virtual Reality for the Web - Game development
vr devices with the popularity of oculus rift and a lot of other devices in production coming soon to the market, the future looks bright — we already have sufficient technology to make the vr experience "good enough" for playing games.
... the future of webvr it's happening — consumer devices are reaching the market right now, and we already have javascript apis to support them on the web.

Audio for Web games - Game development
the advantage is that we can prime one piece of audio and have our sprites ready to go.
...loading synchronously might mean parts of your music are ready earlier and you can start playing them while others load.

Implementing controls using the Gamepad API - Game development
api status and browser support the gamepad api is still at the working draft stage in the w3c process, which means its implementation might still change, but saying that the browser support is already quite good.
... if(gamepadapi.buttonsstatus[i] == button) { // set the boolean variable to true newpress = true; // if we want to check the single press if(!hold) { // loop through the cached states from the previous frame for(var j=0,p=gamepadapi.buttonscache.length; j<p; j++) { // if the button was already pressed, ignore new press if(gamepadapi.buttonscache[j] == button) { newpress = false; } } } } } return newpress; }, there are two types of action to consider for a button: a single press and a hold.

asm.js - Game development
this subset of javascript is already highly optimized in many javascript engines using fancy just-in-time (jit) compiling techniques.
... using a subset of javascript asm.js is already supported by major web browsers.

Collision detection - Game development
we have the bricks appearing on the screen already, but the game still isn't that interesting as the ball goes through them.
...we have to figure out a way to get rid of the ones we've already hit with the ball.

Initialize the framework - Game development
the id of the <canvas> to use for rendering if one already exists on the page (we've specified null because we want phaser to create its own.) the names to use for phaser's three key functions that load and start the game, and update the game loop on every frame; we will use the same names to keep it clean.
... preload takes care of preloading the assets create is executed once when everything is loaded and ready update is executed on every frame.

2D breakout game using Phaser - Game development
to get the most out of this series of articles you should already have basic to intermediate javascript knowledge.
...if you are not already familiar with pure javascript game development, we would suggest that you first work through this series' counterpart, 2d breakout game using pure javascript.

2D maze game with device orientation - Game development
the create function holds some basic configuration: we're setting up the scaling and alignment of the canvas, and moving on to the preload state when everything's ready.
... controlling the ball it’s cool to have the ball ready to be thrown around in the play area, but it’s also important to be able to actually move it!

Visual typescript game engine - Game development
already implemented: -video chat webrtc (sip) chat and data communication.
... -run services database server (locally and leave it alive to develop process): npm run dataserver looks like this : mongod --dbpath ./server/database/data fix: "failed: address already in use" : netstat -ano | findstr :27017 taskkill /pid typeyourpidhere /f also important "run visual studio code as administrator".

Gecko FAQ - Gecko Redirect 1
hich is only used in hebrew and arabic (ibm has begun work to add bidi support in a future release) style sheets css 1 - full support, except for: the application of styles to html column elements the ability to turn off author styles the names of certain mozilla extension pseudo-classes lack the moz- prefix css 2 - partial support is expected and has already been built into gecko, including support for css2 positioning, but no commitment has been made to achieve a specific level of support dom level 0 level 1 core: full support making entityreferences available through dom1; per a provision of the dom1 spec for xml implementations, entities will be automatically expanded inline and therefore not available through dom1; our im...
...plementation extrapolates this provision to apply to entityreferences as well for more information, see the dom in mozilla level 1 html dom 2 - most of it has already been implemented in gecko, including support for dom 2 events, the dom 2 style, and the dom2 core.

Hoisting - MDN Web Docs Glossary: Definitions of Web-related terms
// example 1 // only y is hoisted x = 1; // initialize x, and if not already declared, declare it - but no hoisting as there is no var in the statement.
... console.log(x + " " + y); // '1 undefined' // this prints value of y as undefined as javascript only hoists declarations var y = 2; // declare and initialize y // example 2 // no hoisting, but since initialization also causes declaration (if not already declared), variables are available.

A cool-looking box - Learn web development
prerequisites: before attempting this assessment, you should have already worked through all the articles in this module.
... details of what you have already tried, and what you would like us to do, e.g.

Cascade and inheritance - Learn web development
source order we have already seen how source order matters to the cascade.
...we already know that an element selector has low specificity and can be overwritten by a class.

Creating fancy letterheaded paper - Learn web development
prerequisites: before attempting this assessment you should have already worked through all the articles in this module.
... details of what you have already tried, and what you would like us to do, e.g.

Fundamental CSS comprehension - Learn web development
prerequisites: before attempting this assessment you should have already worked through all the articles in this module.
... details of what you have already tried, and what you would like us to do, e.g.

Handling different text directions - Learn web development
writing modes and block and inline layout we have already discussed block and inline layout, and the fact that some things display as block elements and others as inline elements.
... logical properties and values the reason to talk about writing modes and direction at this point in your learning however, is because of the fact we have already looked at a lot of properties which are tied to the physical dimensions of the screen, and make most sense when in a horizontal writing mode.

Organizing your CSS - Learn web development
if spaces, how many spaces?) having a set of rules you always follow reduces the amount of mental overhead needed when writing css, as some of the decisions are already made.
... css methodologies instead of needing to come up with your own rules for writing css, you may benefit from adopting one of the approaches already designed by the community and tested across many projects.

The box model - Learn web development
margins, padding, and borders you've already seen the margin, padding, and border properties at work in the example above.
... an element with display: inline-block does a subset of the block things we already know about: the width and height properties are respected.

Test Your Skills: Fundamental layout comprehension - Learn web development
if you have worked through this module then you will have already covered the basics of what you need to know to do css layout today, and to work with older css as well.
... details of what you have already tried, and what you would like us to do, e.g.

Test your skills: Grid Layout - Learn web development
grid layout two in this example we already have a grid defined.
... details of what you have already tried, and what you would like us to do, e.g.

Responsive design - Learn web development
the first was the idea of fluid grids, something which was already being explored by gillenwater, and can be read up on in marcotte's article, fluid grids (published in 2009 on a list apart).
...the media queries level 3 specification became a candidate recommendation in 2009, meaning that it was deemed ready for implementation in browsers.

Getting started with CSS - Learn web development
styling html elements by making our heading red we have already demonstrated that we can target and style an html element.
...however you now already know enough to style text, apply css based on different ways of targeting elements in the document, and look up properties and values in the mdn documentation.

Styling links - Learn web development
visited: a link when it has already been visited (exists in the browser's history), styled using the :visited pseudo class.
... you've reached the end of this article, and already did some skill testing in our active learning sections, but can you remember the most important information going forward?

Typesetting a community school homepage - Learn web development
prerequisites: before attempting this assessment you should have already worked through all the articles in this module.
... details of what you have already tried, and what you would like us to do, e.g.

What text editors are available? - Learn web development
prerequisites: you should already know about various software you need to build a website.
...your computer may already be installed with one of the editors suggested above (e.g.

How does the Internet work? - Learn web development
well, there are already cables linked to your house, for example, electric power and telephone.
... the telephone infrastructure already connects your house with anyone in the world so it is the perfect wire we need.

How much does it cost to do something on the Web? - Learn web development
prerequisites: you should already understand what software you need, the difference between a webpage, a website, etc., and what a domain name is.
... browsers you either already have a browser or can get one for free.

How do you set up a local testing server? - Learn web development
if you are using linux or macos, it should be available on your system already.
... note: if you already have something running on port 8000, you can choose another port by running the server command followed by an alternative port number, e.g.

Sending forms through JavaScript - Learn web development
= { dom : document.getelementbyid( "thefile" ), binary : null }; // use the filereader api to access file content const reader = new filereader(); // because filereader is asynchronous, store its // result when it finishes to read the file reader.addeventlistener( "load", function () { file.binary = reader.result; } ); // at page load, if a file is already selected, read it.
... file.dom.addeventlistener( "change", function () { if( reader.readystate === filereader.loading ) { reader.abort(); } reader.readasbinarystring( file.dom.files[0] ); } ); // senddata is our main function function senddata() { // if there is a selected file, wait it is read // if there is not, delay the execution of the function if( !file.binary && file.dom.files.length > 0 ) { settimeout( senddata, 10 ); return; } // to construct our multipart form data request, // we need an xmlhttprequest instance const xhr = new xmlhttprequest(); // we need a separator to define each part of the req...

UI pseudo-classes - Learn web development
ntent: " "; width: 10px; height: 10px; border-radius: 6px; background-color: red; font-size: 1.2em; transform: translate(3px, 3px) scale(0); transform-origin: center; transition: all 0.3s ease-in; } input[type="radio"]:checked::before { transform: translate(3px, 3px) scale(1); transition: all 0.3s cubic-bezier(0.25, 0.25, 0.56, 2); } this is really useful — screenreaders already let their users know when a radio button or checkbox they encounter is checked/selected, so you don't want them to read out another dom element that indicates selection — that could be confusing.
... note: we've used ::before to add these labels, as we were already using ::after for the "required" labels.

Add a hitmap on top of an image - Learn web development
prerequisites: you should already know how to create a basic html document and how to add accessible images to a webpage.
... you may write alt="" if the href attribute is blank and the entire image already has an alt attribute.

Marking up a letter - Learn web development
prerequisites: before attempting this assessment you should have already worked through getting started with html, what's in the head?
... details of what you have already tried, and what you would like us to do (if you are stuck and need help, or if you want an assessment).

Adding vector graphics to the Web - Learn web development
if you have not already done so, please read images in html.
...in the input section below you'll see that we've already provided you with some samples to get you started.

Test your skills: HTML images - Learn web development
html images 2 in this task you already have a full-featured image, but we'd like you to add a tooltip that appears when the image is moused over.
... details of what you have already tried, and what you would like us to do, e.g.

Responsive images - Learn web development
prerequisites: you should already know the basics of html and how to add static images to a web page.
...by then, the original image would already have been loaded, and you would load the small image as well, which is even worse in responsive image terms.

Video and audio content - Learn web development
ovps even usually offer ready-made code for embedding video/audio in your webpages; if you use that route, you can avoid some of the difficulties we discuss in this article.
... the embedded video will look something like this: you can try the example live here (see also the source code.) using multiple source formats to improve compatibility there's a problem with the above example, which you may have noticed already if you've tried to access the live link above with an older browser like internet explorer or even an older version of safari.

HTML table basics - Learn web development
place the four cells you've already created inside <tr> tags, like so: <tr> <td>hi, i'm your first cell.</td> <td>i'm your second cell.</td> <td>i'm your third cell.</td> <td>i'm your fourth cell.</td> </tr> now you've made one row, have a go at making one or two more — each row needs to be wrapped in an additional <tr> element, with each cell contained in a <td>.
... we have already partially answered this question — it is easier to find the data you are looking for when the headers clearly stand out, and the design just generally looks better.

Assessment: Structuring planet data - Learn web development
prerequisites: before attempting this assessment you should have already worked through all the articles in this module.
... details of what you have already tried, and what you would like us to do, e.g.

Introduction to events - Learn web development
you've already seen events and event handlers used in many of the examples, but let's recap just to cement our knowledge.
...it's just a copy of the simple random color example we've played with already.

Manipulating documents - Learn web development
the input should be emptied and focused ready for you to enter another item.
... finally, use the focus() method to focus the input element ready for entering the next shopping list item.

Silly story generator - Learn web development
prerequisites: before attempting this assessment you should have already worked through all the articles in this module.
... details of what you have already tried, and what you would like us to do, e.g.

Test your skills: Math - Learn web development
math 2 in the second task you are already provided with two calculations, with the results stored in the variables result and result2.
... details of what you have already tried, and what you would like us to do, e.g.

Test your skills: Strings - Learn web development
you already have half of a famous quote inside a variable called quotestart; we would like you to: look up the other half of the quote, and add it to the example inside a variable called quoteend.
... details of what you have already tried, and what you would like us to do, e.g.

What is JavaScript? - Learn web development
apis are ready-made sets of code building blocks that allow a developer to implement programs that would otherwise be hard or impossible to implement.
... they do the same thing for programming that ready-made furniture kits do for home building — it is much easier to take ready-cut panels and screw them together to make a bookshelf than it is to work out the design yourself, go and find the correct wood, cut all the panels to the right size and shape, find the correct-sized screws, and then put them together to make a bookshelf.

Aprender y obtener ayuda - Learn web development
using mdn the site you are already on has a wealth of information available to you — both reference material for looking up code syntax, and guides/tutorials for learning techniques.
... other online resources we already mentioned stack overflow, but there are other online resources that can help.

Learning area release notes - Learn web development
learn why frameworks exist, when you should use one (and when you shouldn't), what kinds of features are common to all frameworks, and how they relate to the vanilla javascript you may already know.
...this is in addition to the longer assessment articles that you'll find in some of the learning modules already.

Server-side web frameworks - Learn web development
if you are part of a development team that already has significant experience with a particular web framework or programming language, then it makes sense to stick with that.
...frameworks that include everything are often easier to get started with because you already have everything you need, and the chances are that it is well integrated and well documented.

Routing in Ember - Learn web development
at the moment, we already have the "all" page, as we are currently not doing any filtering in the page that we've been working with, but we will need to reorganize it a bit to handle a different view for the "active" and "completed" todos.
...it already contains a getter that returns all todos, and a getter that returns incomplete todos.

Introduction to client-side frameworks - Learn web development
by this point, it had already been using react to solve many of its problems internally.
...there are a number of advantages of this approach, mostly around performance (your user's device isn’t building the page with javascript; it's already complete) and security (static pages have fewer attack vectors).

Componentizing our React app - Learn web development
let's try the following instead of what we have already: const tasklist = props.tasks.map(task => <todo />); look again at your app; now our tasks look more like they used to, but they’re missing the names of the tasks themselves.
...p stack-exception"> <filterbutton /> <filterbutton /> <filterbutton /> </div> <h2 id="list-heading">3 tasks remaining</h2> <ul role="list" classname="todo-list stack-large stack-exception" aria-labelledby="list-heading" > {tasklist} </ul> </div> ); } export default app; with this in place, we’re almost ready to tackle some interactivity in our react app!

React interactivity: Events and state - Learn web development
there are a couple of other things to note: the camel-cased nature of onclick is important — jsx will not recognize onclick (again, it is already used in javascript for a specific purpose, which is related but different — standard onclick handler properties).
...o-input" classname="input input__lg" name="text" autocomplete="off" value={name} onchange={handlechange} /> <button type="submit" classname="btn btn__primary btn__lg"> add </button> </form> ); } export default form; putting it all together: adding a task now that we've practiced with events, callback props, and hooks we're ready to write functionality that will allow a user to add a new task from their browser.

Creating our first Vue component - Learn web development
it also binds other attributes (data, which you’ve already seen, and others like methods, computed, etc.) directly to the instance.
... now we're ready to add multiple todoitem components to our app.

Focus management with Vue refs - Learn web development
you don't have to use $nexttick here because the component has already been added to the dom when mounted() is called.
... we're already tracking the number of elements in our list heading — the <h2> in app.vue — and it's associated with our list of to-do items.

Rendering a list of Vue components - Learn web development
previous overview: client-side javascript frameworks next at this point we've got a fully working component; we're now ready to add multiple todoitem components to our app.
...while this isn't strictly necessary, it makes it easier for us to manage since we already need to create a unique id for each todo item anyway.

Styling Vue components with CSS - Learn web development
there are already some styles present in the file.
...the label, however, already denotes the purpose of the form.

Implementing feature detection - Learn web development
javascript we already saw an example of a javascript feature detection test earlier on.
... when you are using modernizr in production, you can go to the download page you've already visited and click the plus buttons for only the features you need feature detects for.

Strategies for carrying out testing - Learn web development
of course, this relies on you already having a site to use it on, so it isn't much good for completely new sites.
...your site should now be ready to start reporting analytics data.

Setting up your own test automation environment - Learn web development
to do this, you need to: install the node sauce labs wrapper using the following command (if you've not already done it for this project): npm install saucelabs --save-dev require saucelabs — put this at the top of your sauce_google_test.js file, just below the previous variable declarations: const saucelabs = require('saucelabs'); create a new instance of saucelabs, by adding the following just below that: let saucelabs = new saucelabs({ username : "your-user-name", password : "your-...
...if you've not already added the location to your path, do so now (see the setting up selenium in node section).

Learn web development
beyond the basics: if you have a bit of knowledge already, the next step is to learn html and css in detail: start with our introduction to html module and move on to our css first steps module.
... moving onto scripting: if you are comfortable with html and css already, or you are mainly interested in coding, you'll want to move on to javascript or server-side development.

Accessibility Features in Firefox
have announced they are already working with the technology their new richer interfaces accessible with this new technology.
...thanks to sun's efforts we already have excellent support for the gnome onscreen keyboard (gok).

CSUN Firefox Materials
have announced they are already working with the technology their new richer interfaces accessible with this new technology.
...thanks to sun's efforts we already have excellent support for the gok onscreen keyboard.

Embedding API for Accessibility
mozilla already supports some of these options.
... this document lays out what we already have, and what we'll need later, in the embedding api to support accessibility.

Gecko info for Windows accessibility vendors
once the new page is ready to be displayed and traversed via its iaccessible tree, the old content window is destroyed, and a new window is created.
...if placetopleft is false, the document will only be scrolled if the element is not already visible, or the document will be scrolled the minimum amount to make the element visible anywhere within the current window.

Adding a new word to the en-US dictionary
the process is pretty straight-forward: get a clone of uxp, if you don't already have one, and make sure you can build it successfully.
...the script only works if you have the environment variable editor set to the executable of an editor program; if you don't have it set, you can do editor=vim sh edit-dictionary to edit using vim (or you can substitute some other editor), or you can just do sh edit-dictionary if you have an editor already specified.

Application cache implementation overview
processnexturi then invokes it self asynchronously via dispatch to a main thread when not already on the concurrency limit of 15 loads.
... when the manifest is identical, the cache is activated, onupdateready event is invoked and the update 'finishes'.

Testopia
despite bugzilla 5.0 has already been released a few months ago, we don't plan to release a fix for testopia immediately, because it's currently under heavy work to make testopia a fully self-contained extension, which means that all tr_*.cgi scripts which are currently in the bugzilla/ root directory are being moved into extensions/testopia/lib/.
... the good news is that the current code in the git repository already works with bugzilla 5.0, and so if you upgraded to 5.0 already, and if you don't mind having a work-in-progress extension on your machine, you can decide to pull the code from the git repository.

Creating a Language Pack
$ make langpack-x-testing locale_mergedir=$(pwd)/mergedir now go to the dist directory to find your langpack ready to use!
... mv -f "../../dist/l10n-stage/firefox-3.6b5pre.x-testing.mac.dmg" "../../dist/firefox-3.6b5pre.x-testing.mac.dmg" repackaging done now go to the dist directory to find your repackaged binary ready to be installed!

Creating a spell check dictionary add-on
if you are creating a new dictionary, as opposed to updating an existing one, please make sure that there is not already a dictionary available for your locale.
... if there already is one, try contacting the author to get it updated, or contact amo editors if the author does not respond.

Creating reftest-based unit tests
step 3 create a file named foo.html with the following: <html><head><title>reftest0001</title> <body><strong>hello!</strong></body> </html> step 4 create a file named bar.html with the following: <html><head><title>reftest0001</title> <body><b>hello!</b></body> </html> step 5 create a file named reftest.list with the following: == foo.html bar.html you are now ready to run the test (but first you must go back to the root of firefox's source code tree): $ ./mach reftest path/to/reftest.list 2>&1 | grep reftest reftest pass: file:///users/ray/mozilla-central/path/to/foo.html $ congratulations!
...third, you need to remove 'reftest-wait' from the root element's 'class' attribute to tell the reftest framework that the test is now ready to have its rendering tested.

Capturing a minidump
if firefox is not already running, then open windbg from the start menu (start->all programs->debugging tools for windows->windbg).
... if firefox is already running, open windbg from the start menu (start->all programs->debugging tools for windows->windbg).

Debugging Table Reflow
leaving assignnonpctcolwidths shows that already to all columns a width of 360 twips has been assigned assignnonpctcolwidths ex ***start table dump*** mcolwidths=360 360 360 360 col frame cache -> 0=00b93138 1=00b931f0 2=024dd728 3=024dd780 **start col dump** colindex=0 isanonymous=0 constraint=0 widths=360 540 1230 -1 -1 -1 -1 -1 -1 360 **end col dump** **start col dump** colindex=1 isanonymous=0 constraint=0 widths=360 540 -1 -1 -1 ...
...-1 -1 -1 -1 360 **end col dump** **start col dump** colindex=2 isanonymous=0 constraint=3 widths=360 540 -1 -1 -1 -1 -1 -1 540 360 **end col dump** **start col dump** colindex=3 isanonymous=0 constraint=0 widths=360 540 -1 -1 -1 -1 -1 -1 -1 360 **end col dump** ***end table dump*** the first column has already the minimum content width, the table column can't shrink below that, the desired content width of 540 twips, that's the space to layout cell 1 without wrapping the text and the 1230 which correspond to the style="width:80px" at the first cell.

Debugging on Mac OS X
# therefore setting `settings set target.load-cwd-lldbinit true` can't help us # without xcode providing that functionality.) # # the following works by setting a one-shot breakpoint to break on a function # that we know will both run early (which we want when we start first start the # app) and run frequently (which we want so that it will trigger asap if we # attach to an already running app).
... now you're ready to start debugging: from the "product" menu, ensure the scheme you created above is selected under "scheme" click the "run" button.

HTTP logging
windows if firefox is already running, exit out of it.
... here is an example for the windows platform, on other platforms we accept the same form of the arguments: if firefox is already running, exit out of it.

Working with Mozilla source code
getting a pre-configured mozilla build system virtual machine this is the easiest way to get started: use a virtualbox virtual machine which is already configured with a complete build environment for you to use.
... getting commit access to the source code feel ready to join the few, the proud, the committers?

Multiple Firefox profiles
from profile manager inside firefox if you already have firefox instance running, you can open another profile from the integrated profile manager on any platform: type about:profiles into the browser url search bar.
... linux if firefox is already included in your linux distribution, or if you have installed firefox with the package manager of your linux distribution: open a terminal emulator or your shell’s command prompt: alt-f2 if you use gnome shell or kde plasma, consult your desktop environment documentation for other environments.

Cross Process Object Wrappers
but if the chrome process then tries to use a cpow, the chrome process will block until the content process is ready to respond.
... suddenly, what looked like a simple property access could block the ui for a noticeable amount of time: there is one scenario, though, in which this is not a problem: when the content process is already blocking on a synchronous message it sent to the chrome process.

Storage access policy: Block cookies from trackers
the above heuristics will also serve to extend the lifetime of a third-party storage permission on origins that have already been granted access.
... if the preference already exists, edit the preference value.

Gecko Keypress Event
xul application developers should use key elements for handling accel keys, so as to make use of the handling logic already provided for these elements.
...it is better to use the logic already in nscontentutils::getaccelkeycandidates() for accel key handling, and nscontentutils::getaccesskeycandidates() for access key handling (see nscontentutils.h and nscontentutils.cpp).

How to get a stacktrace with WinDbg
debugging to begin debugging, ensure that firefox is not already running and open windbg from the start menu.
... .logopen /t c:\temp\firefox-debug.log .childdbg 1 .tlist sxn gp lm if you see firefox.exe listed in the output from .tlist more than once, then you are already running the application and need to close the running instance first before you start debugging, otherwise you won't get useful results.

IME handling guide
eselectedrawclause converted clause by ime selection_ime_convertedtext eimeconvertedclause econvertedclause selected clause by the user or ime and also converted by ime selection_ime_selectedconvertedtext eimeselectedclause eselectedclause note that typically, "selected clause of raw text typed by the user" isn't used because when composition string is already separated to multiple clauses, that means that the composition string has already been converted by ime at least once.
...if all sent widgetcompositionevents and widgetselectionevents are already handled in the remote process, contentcacheinparent sending the notifications to widget.

Implementing QueryInterface
calling an inherited queryinterface sometimes you are just adding one or two new interfaces to an implementation that already supports many other interfaces.
... this technique works because nsbaseimplementation is already a complete class that could have been used on its own.

JavaScript-DOM Prototypes in Mozilla
this means that the next time the name of a class constructor is resolved in the same scope, say htmlanchorelement, the code will resolve the name htmlanchorelement, find the parent name, which is htmlelement, and resolve that, but since we've already resolved htmlelement as a result of resolving the name htmlimageelement earlier, the recursion will stop right there.
...obj.__proto__.__proto__) has been set up already, if it has, then there's nothing left to do in nsdomclassinfo::postcreate().

Add-on Repository
results passed to the searchcallback object only include add-ons that are compatible with the current application and are not already installed or in the process of being installed.
...a new search will immediately fail if the addonrepository is already handling another search request.

DownloadList
if the download was already removed, this method has no effect.
...the newly added view will receive ondownloadadded notifications for all the downloads that are already in the list.

Using JavaScript code modules
if you're writing an extension for firefox 4 and already have a chrome.manifest with a content instruction in it, you can put the code module in your content folder and reference it like your other content files via chrome://<yourextension>/content/<yourmodule>.jsm.
...for example: // import services.jsm unless in a scope where it's already been imported components.utils.import("resource://gre/modules/services.jsm"); var resprot = services.io.getprotocolhandler("resource") .queryinterface(components.interfaces.nsiresprotocolhandler); var aliasfile = components.classes["@mozilla.org/file/local;1"] .createinstance(components.interfaces.nsilocalfile); aliasfile.initwithpath("/some/absol...

Bootstrapping a new locale
this is why you need to do hg push, which sends the already made commits to the remote repository (http://bitbucket.org/mozillal10n/ab-cd/ in the example above).
... after you have committed and pushed your initial translation, email the l10n-drivers team to let us know it's ready.

Localizing without a specialized tool
with that document, users can see immediately two localized files in their user interface by following closely and carefully the steps to create a language pack or a binary file that is ready for installation.
...you are now ready to start translating!

QA phase
enter the following command to perform the configuration: $ ./mach configure once your command-line finishes spitting out the config command's output, navigate to the newly created directory: $ cd ../firefox-build/browser/locales now you're ready to build!
... now you're ready to proceed to the release phase!

Localization sign-off reviews
overview you've done some localization work and are ready for it to be released.
...so before you request your sign-off review, be sure that it is as ready as it can be.

Fonts for Mozilla 2.0's MathML engine
on mac os x lion (10.7) and higher versions, stix fonts are already installed and can be used for mathml.
...all the fonts mentioned above may already be installed by default on your system or can easily be installed via your software manager.

Mozilla Style System Documentation
for frames: const nsstyledisplay *display; ::getstyledata(frame, &display); or for style contexts: const nsstyledisplay *display; ::getstyledata(sc, &display); these functions cause an appropriate struct to be computed if it hasn't been computed already and then fill in the struct pointer.
...it uses the appropriate declaration struct and has each rule fill in any properties specified by that rule that are not filled in already.

Profiling with Xperf
it might already be installed by the windows sdk.
... check if c:\program files\microsoft windows performance toolkit already exists.

McCoy
https://fireclipse.svn.sourceforge.net/svnroot/fireclipse/trunk/fireclipseextensions/chromebug/mccoy/signontheline/ bug 396525 - patch to mccoy https://bugzilla.mozilla.org/show_bug.cgi?id=396525 signing update manifests before you release your add-on in order to verify the update manifests applications need to already have information from you for how to verify it.
... releasing an update once you are ready to release an updated version of your add-on you must create yourself an update.rdf file.

Creating a Cookie Log
linux start a command shell (these instructions are for bash, if you use something else, you probably know how to modify these instructions already).
... run firefox by typing "./firefox" and pressing enter mac os x open terminal.app, which is located in the /applications/utilities folder (these instructions are for bash, the default shell in mac os x 10.3 and higher; if you use something else, you probably know how to modify these instructions already).

PR_Initialized
syntax #include <prinit.h> prbool pr_initialized(void); returns the function returns one of the following values: if pr_init has already been called, pr_true.
... if pr_init has not already been called, pr_false.

PR_NotifyAll
promotes all threads waiting on a specified monitor to a ready state.
... description a call to pr_notifyall causes all of the threads waiting on the monitor to be scheduled to be promoted to a ready state.

PR_Sleep
if you have already created such structures, it is more efficient to use them directly.
... calling pr_sleep with the value of ticks set to pr_interval_no_wait simply surrenders the processor to ready threads of the same priority.

An overview of NSS Internals
a trust anchor is just another x.509 certificate that is already known and has been deliberately marked as trusted by a software vendor, administrators inside an organizational infrastructure, or the software user.
...when using an ssl network connection, you'll already have two layers, the basic nspr layer and an ssl library layer.

FIPS Mode - an explanation
(note: mozilla does not distribute a "fips mode"-ready nss with firefox.) this page attempts to provide an informal explanation of what it is, who would use it, and why.
...some third-parties distribute firefox ready for fips mode, a partial list can be found at the nss wiki.

HTTP delegation
instead, the parameters are a server session object (that carries host and port information already) and the request path.
...(when issueing get requests, the "?query-string=data" portion should already be appended to the request path) after creation, nss might call functions to provide additional details of the http request (e.g.

HTTP delegation
instead, the parameters are a server session object (that carries host and port information already) and the request path.
...(when issuing get requests, the "?query-string=data" portion should already be appended to the request path) after creation, nss might call functions to provide additional details of the http request (e.g.

Encrypt Decrypt_MAC_Using Token
strcpy(headerfilename, infilename); strcat(headerfilename, ".header"); /* for intermediate encrypted file, choose filename as inputfile name with extension ".enc" */ strcpy(encryptedfilename, infilename); strcat(encryptedfilename, ".enc"); pr_init(pr_user_thread, pr_priority_normal, 0); switch (cmd) { case encrypt: /* if the intermediate header file already exists, delete it.
... */ if (pr_access(headerfilename, pr_access_exists) == pr_success) { pr_delete(headerfilename); } /* if the intermediate encrypted already exists, delete it.

NSS Sample Code Sample1
rappedenckey) secitem_freeitem(mwrappedenckey, pr_true); if (mwrappedmackey) secitem_freeitem(mwrappedmackey, pr_true); if (menckey) pk11_freesymkey(menckey); if (mmackey) pk11_freesymkey(mmackey); } int server::init() { int rv = 0; seckeyprivatekey *prvkey = 0; seckeypublickey *pubkey = 0; pk11slotinfo *slot = 0; pk11rsagenparams rsaparams; secstatus s; // see if there is already a private key with this name.
... rv = server1->generatekeys(); if (rv) { cout << "generatekeys failed" << endl; goto done; } // now that everything is ready, start server1.

NSS Sample Code sample6
should succeed on first run on a fresh db, * should fail on successive runs because key with that id already exists */ genkey(1); /* generate a key with id 2.
... should succeed on first run on a fresh db, * should fail on successive runs because key with that id already exists */ genkey(2); /* generate a key with id 1 - this will fail because key with that id * already exists */ genkey(1); } void genkey(int id) { pk11slotinfo* slot = null; pk11symkey* key = null; secitem keyiditem; int keyid[1]; ck_mechanism_type ciphermech; /* using ckm_aes_cbc_pad mechanism for example */ ciphermech = ckm_aes_cbc_pad; slot = pk11_getinternalkeyslot(); /* slot = pk11_getbestslot(ciphermech, null); didn't work.

PKCS #11 Module Specs
ciphers - comma separated list of ciphers this token will enable that isn't already enabled by the library (currently only fortezza is defined) (case-insensitive).
...at init time nss, will try to look for a default root cert device if one has not already been loaded.

NSS tools : certutil
the certificate database should already exist; if one is not present, this command option will initialize one by default.
...the key database should already exist; if one is not present, this option will initialize one by default.

ssltyp.html
when an application makes a copy of a particular certificate structure that already exists in memory, ssl makes a shallow copy--that is, it increments the reference count for that object rather than making a whole new copy.
...when an application makes a copy of a particular key structure that already exists in memory, ssl makes a deep copy--that is, it makes a whole new copy of that object.

NSS Tools certutil
the key database should already exist; if one is not present, this option will initialize one by default.
...the certificate database should already exist; if one is not present, this option will initialize one by default.

certutil
the certificate database should already exist; if one is not present, this option will initialize one by default.
... the key database should already exist; if one is not present, this option will initialize one by default.

NSS tools : signtool
when testing is finished and you are ready to disitribute your software, you should obtain an object-signing certificate from one of two kinds of sources: * an independent certificate authority (ca) that authenticates your identity and charges you a fee.
...if the certificate authority's certificate isn't already installed in your copy of communicator, you typically install it by clicking the appropriate link on the certificate authority's web site, for example on the page from which you initiated enrollment for your signing certificate.

JSObjectOps.getRequiredSlot
the jsobjectops.getrequiredslot and setrequiredslot callbacks get and set a required slot—one that should already have been allocated.
... description get and set a required slot, one that should already have been allocated.

JS_ConvertArguments
variables for optional parameters must already be initialized, because if an optional parameter is not in argv, js_convertarguments does not modify the corresponding variable.
...instead, use jsval_is_object and js_objectisfunction() to check whether a value is already a function, or use js_convertvalue() to convert a value to jstype_function safely.

JS_EnumerateResolvedStandardClasses
enumerate any already-resolved standard class ids.
... syntax jsidarray * js_enumerateresolvedstandardclasses(jscontext *cx, jsobject *obj, jsidarray *ida); name type description description js_enumerateresolvedstandardclasses enumerates any already-resolved standard class ids into ida, or into a new jsidarray if ida is null.

JS_SetGCCallback
but the javascript engine will then detect that gc is already happening and will not actually do a nested gc cycle in this case.
...if a thread that is not in an active request calls js_gc while gc is already happening on another thread).

Handling Mozilla Security Bugs
the bugzilla administrators will technically be in the mozilla security bug group as well, mainly because they already have visibility into all bugzilla data hosted through mozilla.org.
... the criteria for membership in the mozilla security bug group are as follows: the applicant must be trusted by those already in the group.

Setting up an update server
most likely, a different maintenance service is already installed, probably at c:\program files (x86)\mozilla maintenance service\maintenanceservice.exe.
... windows/linux: <install dir>/distribution/policies.json macos: <install dir>/contents/resources/distribution/policies.json create the distribution directory, if necessary, and put this in policies.json: { "policies": { "appupdateurl": "http://127.0.0.1:8000/update.xml" } } now you are ready to update!

Manipulating bookmarks using Places
checking to see if a uri is bookmarked if you want to see if a given uri is already bookmarked -- for example, to avoid creating a new bookmark for a site that's already bookmarked -- you can use the nsinavbookmarksservice.isbookmarked() method.
... var ios = components.classes["@mozilla.org/network/io-service;1"] .getservice(components.interfaces.nsiioservice); var uri = ios.newuri("http://mozilla.com/", null, null); if (!bmsvc.isbookmarked(uri)) { bmsvc.insertbookmark(bmsvc.toolbarfolder, uri, bmsvc.default_index, "mozilla"); } this example looks to see if the user already has a bookmark for the mozilla web site, and, if not, creates one, adding it to the user's bookmarks toolbar.

Accessing the Windows Registry Using XPCOM
you can call these methods on an already-opened registry key to open a child key.
...in this function, wrk is expected to be an already opened nsiwindowsregkey.

Creating the Component Code
since xpcom already knows internally what kind of file it has just loaded and called registerself on, passing this value to the registration methods is a shortcut for determining what kind of component is being registered.
...xpcom then loads the component library associated with the cid if it isn't loaded already.

Mozilla internal string guide
if there's a need to request a different capacity before you are ready to call finish(), you can call restartbulkwrite() on the handle.
... // modify the url and pass to addpage(const char16_t* url) void addmodifiedpage(const nsastring& url) { constexpr auto httpprefix = u"http://"_ns; const nsastring& modifiedurl = httpprefix + url; // creates a temporary buffer addpage(promiseflatstring(modifiedurl).get()); } promiseflatstring() is smart when handed a string that is already null-terminated.

XPCOM Stream Guide
stream listeners a stream listener is an object you build to let you know when there is data in a stream ready for you to consume.
... (xxx nsiunicharinputstream interface) (xxx nsiunicharlineinputstream interface) (xxx nsisearchableinputstream interface) stream converters (tbd: @mozilla.org/streamconverters;1) forcing an input stream to be read suppose you already have an input stream, and something to read from that input stream...but the reader doesn't do anything with the stream.

Components.utils.importGlobalProperties
therefore readystate must be checked, if it is not complete, then a load listener must be attached.
... once readystate is complete then the objects can be used.

imgIContainer
flag_decode_no_premultiply_alpha: do not premultiply alpha if it is not already premultiplied in the image data.
...if the image is locked or has already been discarded, do nothing.

imgIRequest
aobserver will be notified synchronously (before the clone call returns) with all the notifications that have already been dispatched for this image load.
...calling requestdecode on the imgirequest simply forwards along the request if the container already exists, or calls it once it gets onstartcontainer if the container does not yet exist.

nsIAnnotationService
if the destination already has an annotation with the same name as one on the source, it will be overwritten if aoverwritedest is set.
...if the destination already has an annotation with the same name as one on the source, it will be overwritten if aoverwritedest is set.

nsIApplicationCacheChannel
exceptions thrown ns_error_already_opened if set after calling asyncopen() on the channel.
...exceptions thrown ns_error_already_opened if set after calling asyncopen() on the channel.

nsIBrowserSearchService
init() initialize the service, or if the service is already initialized, do nothing.
... void init( [optional] in nsibrowsersearchinitobserver observer ); parameters observer if specified, a callback called once initialization is complete, or immediately, if the service has already been initialized.

nsICategoryManager
exceptions thrown ns_error_invalid_arg this error is returned if areplace is false and the category entry already has a value, or if apersist is true.
... var content_type = 'application/pdf'; // update the category manager in case the plugins are already loaded.

nsICompositionStringSynthesizer
this means that the clause is already converted.
...this means that the clause is already converted and is selected to convert.

nsIContentSecurityPolicy
isinitialized boolean set to true when the content security policy has been read in and parsed and is ready to enforce.
... this is a barrier for the nsdocument so it doesn't load any sub-content until either it knows that a content security policy is ready or will not be used.

nsICookieManager2
cookieexists() returns whether or not a matching cookie already exists.
... findmatchingcookie() obsolete since gecko 1.9 (firefox 3) find whether a matching cookie already exists, and how many cookies a given host has already set.

nsIDOMStorage
if the key does not already exist, a new key is added, associated with the specified value.
... if the key already exists, the existing value is replaced with the specified value.

nsIDOMStorage2
if the key does not already exist, a new key is added, associated with the specified value.
... if the key already exists, the existing value is replaced with the specified value.

nsIDOMWindowInternal
pagexoffset long returns the number of pixels that the document has already been scrolled horizontally.
... pageyoffset long returns the number of pixels that the document has already been scrolled vertically.

nsIFrameLoaderOwner
1.0 66 introduced gecko 1.8 inherits from: nsisupports last changed in gecko 2.0 (firefox 4 / thunderbird 3.3 / seamonkey 2.1) method overview [noscript, notxpcom] alreadyaddrefed_nsframeloader getframeloader(); void swapframeloaders(in nsiframeloaderowner aotherowner); attributes attribute type description frameloader nsiframeloader the frame loader owned by this nsiframeloaderowner.
...[noscript, notxpcom] alreadyaddrefed_nsframeloader getframeloader(); parameters none.

nsIInputStreamCallback
inherits from: nsisupports last changed in gecko 1.7 method overview void oninputstreamready(in nsiasyncinputstream astream); methods oninputstreamready() called to indicate that the stream is either readable or closed.
... void oninputstreamready( in nsiasyncinputstream astream ); parameters astream the stream whose nsiasyncinputstream.asyncwait() method was called.

nsIMsgHeaderParser
addresses are removed if they are already in either addrs or other_addrs.
... that argument is for passing in addresses that were already mentioned in other header fields.) addresses are considered to be the same if they contain the same mailbox part (case-insensitive.) real names and other comments are not compared.

nsINavBookmarksService
if this item already exists in the given folder, it will be moved to the new position.
...this method does not change the indices of any other items in the same folder, so ensure that the new index does not already exist, or change the index of other items accordingly, otherwise the indices will become corrupted.

nsIOutputStreamCallback
inherits from: nsisupports last changed in gecko 1.7 method overview void onoutputstreamready(in nsiasyncoutputstream astream); methods onoutputstreamready() called to indicate that the stream is either writable or closed.
... void onoutputstreamready( in nsiasyncoutputstream astream ); parameters astream the stream whose nsiasyncoutputstream.asyncwait() method was called.

nsIPermissionManager
if the permission already exists for a given type, it will be modified.
...if the permission already exists for a given type, it will be modified.

nsIRequest
validate_once_per_session 1 << 13 disables validation of expired content, provided it has already been validated (at least once) since the start of this session.
... note: some implementations are unable to immediately suspend, and may continue to deliver events already posted to an event queue.

nsIServerSocket
the listener will be passed a reference to an already connected socket transport (nsisockettransport).
...this does not affect already connected client sockets (i.e., the nsisockettransport instances created from this server socket).

nsISocketTransportService
this will fail with the error code ns_error_not_available if the maximum number of sockets is already reached.
... ahandler socket handler that will receive notifications when the socket is ready or detached.

nsIStyleSheetService
sheets added via this api take effect on all documents, including already-loaded ones, immediately.
...the removal takes effect immediately, even for already-loaded documents.

nsIThread
exceptions thrown ns_error_unexpected shutdown() was erroneously called from within the thread itself, the thread was not created with the thread manager's nsithreadmanager.newthread() method, or the thread is already in the process of being shut down.
... haspendingevents() determines whether or not the thread has events that are ready to be processed.

nsIUpdatePrompt
if the app.update.silent preference is true or the user interface is already displayed the call will be a no-op.
...if the app.update.silent preference is true, the app.update.showinstalledui preference is false, or the user interface is already displayed the call will be a no-op.

nsIUploadChannel
history here is that we need to support both streams that already have headers (for example, content-type and content-length) information prepended to the stream (by plugins) as well as clients (composer, uploading application) that want to upload data streams without any knowledge of protocol specifications.
...acontenttype if acontenttype is empty, the protocol will assume that no content headers are to be added to the uploaded stream and that any required headers are already encoded in the stream.

Setting HTTP request headers
in the case your code initiates the request, you probably already have one.
...the second line of code in the if block should already be familiar to you.

Storage
note: the database engine does not support nested transactions, so attempting to start a transaction when one is already active will throw an exception.
...if a transaction is already in progress, no transaction is obtained.

XPCOM
this article will show you how to use the available interfaces in several mozilla products.aggregating the in-memory datasourcealready_addrefedalready_addrefed in association with nscomptr allows you to assign in a pointer without addrefing it.binary compatibilityif mozilla decides to upgrade to a compiler that does not have the same abi as the current version, any built component may fail.
...this can create a difficult situation for extension developers trying to support multiple gecko versions (firefox 2 and 3, for example).creating a python xpcom componentcreating applications with mozilla already provides a tutorial for making a simple javascript or c++ component (implementing the nsisimple interface).

Creating a gloda message query
let mylistener = { /* called when new items are returned by the database query or freshly indexed */ onitemsadded: function mylistener_onitemsadded(aitems, acollection) { }, /* called when items that are already in our collection get re-indexed */ onitemsmodified: function mylistener_onitemsmodified(aitems, acollection) { }, /* called when items that are in our collection are purged from the system */ onitemsremoved: function mylistener_onitemsremoved(aitems, acollection) { }, /* called when our database query completes */ onquerycompleted: function mylistener_onquerycompleted(acollection) ...
... want a glodamessage when you already have an nsimsgdbhdr?

Index
if the user already has an email account, the user can switch to the original account setup wizard.
...it assumes you are already familiar with configuring preferences for deployed builds in addition to setting up thunderbird to use an ldap directory.

Add to iPhoto
choose it, and iphoto will start up (if it's not already running) and import the image.
...then we call createunique() to create a unique file by that name (or a derivative thereof if the name is already in use), and download the contents of the image file to that local file.

Working with data
if the original value is already a cdata object, the original object is simply duplicated directly into the new one.
... if type is an array type of unspecified length, the following 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.

Plug-in Basics - Plugins
the following stages outline the life of a plug-in from loading to deletion: when gecko encounters data of a mime type registered for a plug-in (either embedded in an html page or in a separate file), it dynamically loads the plug-in code into memory, if it hasn't been loaded already, and it creates a new instance of the plug-in.
... value="http://www.macromedia.com/shockwave/download/index.cgi?p1_prod_version=shockwaveflash"/> </object> </object> </object> </p></body> </html> the outermost object element defines the classid; the first nested object uses the type value application/x-shockwave-flash to load the adobe flash plug-in, and the innermost object exposes a download page for users that do not already have the necessary plug-in.

URLs - Plugins
if the target parameter is set to null, the application creates a new stream and delivers the data to the plug-in instance, through calls to npp_newstream, npp_writeready and npp_write, and npp_destroystream.
...the default is _self, if the plug-in instance document is already at the top.

Introduction to DOM Inspector - Firefox Developer Tools
a browser window and the dom inspector are likely be already open and displayed in this list.
...the dom inspector not only presents all this information about pages in a clear and structured way, it gives you way to find and update those structures, and it's simple to access via shortcuts and menus already available in the mozilla browser.

Dominators view - Firefox Developer Tools
if you already know what shallow size, retained size, and dominators are, skip to the dominators ui section.
... taking a snapshot to see what it looks like in the dominators view: load the page enable the memory tool in the settings, if you haven't already open the memory tool check "record call stacks" press the button labeled "make monsters!" take a snapshot switch to the "dominators" view analyzing the dominators tree you'll see the three arrays as the top three gc roots, each retaining about 23% of the total memory usage: if you expand an array, you'll see the objects (monsters) it contains.

Animation.updatePlaybackRate() - Web APIs
it will be updated once the animation's ready promise is resolved.
... examples a speed selector component would benefit from smooth updating of updateplaybackrate(), as demonstrated below: speedselector.addeventlistener('input', evt => { cartoon.updateplaybackrate(parsefloat(evt.target.value)); cartoon.ready.then(() => { console.log(`playback rate set to ${cartoon.playbackrate}`); }); }); specifications specification status comment web animationsthe definition of 'updateplaybackrate()' in that specification.

AudioWorkletProcessor.process - Web APIs
in other words, every time a new block of audio is ready for your processor to manipulate, your process() function is invoked to do so.
...however, plans are already in place to revise the specification to allow the size of the audio blocks to be changed depending on circumstances (for example, if the audio hardware or cpu utilization is more efficient with larger block sizes).

CustomElementRegistry.whenDefined() - Web APIs
if the custom element is already defined, the promise is resolved immediately.
...the menu displays placeholder content until the actual menu content is ready to display.

CustomEvent.initCustomEvent() - Web APIs
if the event has already been dispatched, this method does nothing.
... living standard initial definition, but already deprecated in favor of the use of a constructor, customevent() ...