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XPathEvaluator.evaluate() - Web APIs
the evaluate() method of the xpathevaluator interface executes an xpath expression on the given node or document and returns an xpathresult.
... syntax xpathresult xpathevaluator.evaluate(expression, contextnode, resolver, type, result); parameters expression a domstring representing the xpath expression to be parsed and evaluated.
... contextnode a node representing the context to use for evaluating the expression.
...And 7 more matches
eval() - JavaScript
it is far too easy for a bad actor to run arbitrary code when you use eval().
... see never use eval()!, below.
... the eval() function evaluates javascript code represented as a string.
...And 44 more matches
Appendix C: Avoiding using eval in Add-ons - Archive of obsolete content
using eval in add-ons is almost always unnecessary, and many times even a security vulnerability.
... moreover, code using eval is harder to parse for a human mind, is often pretty complex, and relies on assumptions that are not necessarily true in the future or even now.
... this article is aimed at presenting alternatives to common eval uses in add-ons and other javascript code.
...And 16 more matches
CSSPrimitiveValue - Web APIs
the cssprimitivevalue interface derives from the cssvalue interface and represents the current computed value of a css property.
...a cssprimitivevalue object only occurs in a context of a css property.
...50" fill="#fff" stroke="#d4dde4" stroke-width="2px" /><text x="41" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">cssvalue</text></a><polyline points="81,25 91,20 91,30 81,25" stroke="#d4dde4" fill="none"/><line x1="91" y1="25" x2="121" y2="25" stroke="#d4dde4"/><a xlink:href="/docs/web/api/cssprimitivevalue" target="_top"><rect x="121" y="1" width="170" height="50" fill="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="206" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">cssprimitivevalue</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties inherits proper...
...And 9 more matches
EvalError - JavaScript
the evalerror object indicates an error regarding the global eval() function.
... this exception is not thrown by javascript anymore, however the evalerror object remains for compatibility.
... constructor evalerror() creates a new evalerror object.
...And 9 more matches
Components.utils.evalInSandbox
the evalinsandbox() function enables you to evaluate javascript code inside a sandbox you've previously created using the components.utils.sandbox constructor.
... note: it's not safe to use evalinsandbox() to evaluate json strings; instead, use the techniques discussed in the article on json.
... use to use evalinsandbox(), you must first create a sandbox object using its constructor, components.utils.sandbox.
...And 6 more matches
Document.evaluate() - Web APIs
WebAPIDocumentevaluate
syntax var xpathresult = document.evaluate( xpathexpression, contextnode, namespaceresolver, resulttype, result ); xpathexpression is a string representing the xpath to be evaluated.
...null is the most common and will create a new xpathresult example var headings = document.evaluate("/html/body//h2", document, null, xpathresult.any_type, null); /* search the document for all h2 elements.
...this is because the evaluation of the query spends does not waste time visiting unnecessary nodes.
...And 6 more matches
XPathExpression.evaluate() - Web APIs
the evaluate() method of the xpathexpression interface executes an xpath expression on the given node or document and returns an xpathresult.
... syntax xpathresult node.evaluate(contextnode, type, result); parameters contextnode a node representing the context to use for evaluating the expression.
... type optional specifies the type of result to be returned by evaluating the expression.
...And 6 more matches
JS::Evaluate
syntax // added in spidermonkey 45 bool js::evaluate(jscontext *cx, const js::readonlycompileoptions &options, js::sourcebufferholder &srcbuf, js::mutablehandlevalue rval); bool js::evaluate(jscontext *cx, const js::readonlycompileoptions &options, const char16_t *chars, size_t length, js::mutablehandlevalue rval); bool js::evaluate(jscontext *cx, const js::readonlycompileoptions &options, const char *bytes, size_t length, js::mutablehandlevalue rval); bool js::evaluate(jscontext *cx, const js::readonlycompileoptions &options, const char *filename, js::mutablehandlevalue rval); ...
...bool js::evaluate(jscontext *cx, js::autoobjectvector &scopechain, const readonlycompileoptions &options, const char16_t *chars, size_t length, js::mutablehandlevalue rval); // added in spidermonkey 17 bool js::evaluate(jscontext *cx, js::autoobjectvector &scopechain, const js::readonlycompileoptions &options, js::sourcebufferholder &srcbuf, js::mutablehandlevalue rval); // obsolete since jsapi 39 bool js::evaluate(jscontext *cx, js::handleobject obj, const js::readonlycompileoptions &options, js::sourcebufferholder &srcbuf, js::mutablehandlevalue rval); bool js::evaluate(jscontext *cx, js::handleobject obj, const js::readonlycompileoptions &options, const char16_t *chars, size_t length...
..., js::mutablehandlevalue rval); bool js::evaluate(jscontext *cx, js::handleobject obj, const js::readonlycompileoptions &options, const char *bytes, size_t length, js::mutablehandlevalue rval); bool js::evaluate(jscontext *cx, js::handleobject obj, const js::readonlycompileoptions &options, const char *filename, js::mutablehandlevalue rval); name type description cx jscontext * the context in which to run the script.
...And 5 more matches
Components.utils.evalInWindow
this function enables code running in a more-privileged javascript context to evaluate a string in a less-privileged javascript context.
...even so, while the code is being evaluated it is in the content's context, so the caller has to be prepared for the possibility that the content could have redefined behavior (for example, a setter in the script may have been redefined to do something unexpected).
...syntax var result = components.utils.evalinwindow(script, window); parameters script : string the script to evaluate in the other window.
...And 5 more matches
nsIDOMXPathEvaluator
dom/interfaces/xpath/nsidomxpathevaluator.idlscriptable this interface is used to evaluate xpath expressions against a dom node.
... inherits from: nsisupports last changed in gecko 1.7 implemented by: @mozilla.org/dom/xpath-evaluator;1.
... to create an instance, use: var domxpathevaluator = components.classes["@mozilla.org/dom/xpath-evaluator;1"] .createinstance(components.interfaces.nsidomxpathevaluator); method overview nsidomxpathexpression createexpression(in domstring expression, in nsidomxpathnsresolver resolver) nsidomxpathnsresolver creatensresolver(in nsidomnode noderesolver); nsisupports evaluate(in domstring expression, in nsidomnode contextnode, in nsidomxpathnsresolver resolver, in unsigned short type, in nsisupports result) methods createexpression() creates an nsidomxpathexpression which can then be used for (repeated) evaluations.
...And 5 more matches
JS_EvaluateScript
syntax jsbool js_evaluatescript(jscontext *cx, jsobject *obj, const char *src, unsigned int length, const char *filename, unsigned int lineno, jsval *rval); jsbool js_evaluateucscript(jscontext *cx, jsobject *obj, const jschar *src, unsigned int length, const char *filename, unsigned int lineno, jsval *rval); name type description cx jscontext * the context in which to run the script.
... description js_evaluatescript compiles and executes a script in the specified scope, obj.
... js_evaluateucscript is the unicode version of the function.
...And 3 more matches
JS_EvaluateScriptForPrincipals
syntax jsbool js_evaluatescriptforprincipals(jscontext *cx, jsobject *obj, jsprincipals *principals, const char *src, unsigned int length, const char *filename, unsigned int lineno, jsval *rval); jsbool js_evaluatescriptucforprincipals(jscontext *cx, jsobject *obj, jsprincipals *principals, const jschar *src, unsigned int length, const char *filename, unsigned int lineno, jsval *rval); jsbool js_evaluatescriptforprincipalsversion(jscontext *cx, jsobject *obj, jsprincipals *principals, const char *bytes, unsigned int length, const...
... char *filename, unsigned int lineno, jsval *rval, jsversion version); jsbool js_evaluateucscriptforprincipalsversion(jscontext *cx, jsobject *obj, jsprincipals *principals, const jschar *chars, unsigned int length, const char *filename, unsigned int lineno, jsval *rval, jsversion version); name type description cx jscontext * the context in which to run the script.
... description js_evaluatescriptforprincipals compiles and executes a script in the specified scope, obj.
...And 3 more matches
Node.nodeValue - Web APIs
WebAPINodenodeValue
the nodevalue property of the node interface returns or sets the value of the current node.
... syntax str = node.nodevalue; node.nodevalue = str; value str is a string containing the value of the current node, if any.
... for the document itself, nodevalue returns null.
...And 3 more matches
XPathEvaluator - Web APIs
the xpathevaluator interface allows to compile and evaluate xpath expressions.
... methods xpathevaluator.createexpression() creates a parsed xpath expression with resolved namespaces.
... xpathevaluator.creatensresolver() adapts any dom node to resolve namespaces allowing the xpath expression to be evaluated relative to the context of the node where it appeared within the document.
...And 3 more matches
NPN_Evaluate - Archive of obsolete content
« gecko plugin api reference « scripting plugins summary evaluates a script in the scope of the specified npobject.
... syntax #include <npruntime.h> bool npn_evaluate(npp npp, npobject *npobj, npstring *script, npvariant *result); parameters the function has the following parameters: npp the npp indicating which plugin instance's window to evaluate the script in.
... script the script to evaluate.
...And 2 more matches
JS::HandleValueArray
syntax js::handlevaluearray(const js::rootedvalue& value); js::handlevaluearray(const js::autovaluevector& values); js::handlevaluearray(const js::autovaluearray<n>& values); js::handlevaluearray(const js::callargs& args); js::handlevaluearray::frommarkedlocation(size_t len, const js::value *elements); js::handlevaluearray::subarray(const js::handlevaluearray& values, size_t startindex, size_t len); js::handlevaluearray::empty(); name type description value js::rootedvalue &amp; an element of newly created 1-length array.
... values js::handlevaluearray (subarray only) an array to get sub array.
... js::handlevalue operator[](size_t i) const returns i-th element of the array.
...And 2 more matches
JS_SameValue
this article covers features introduced in spidermonkey 1.8.1 determines if two jsvals are the same, as determined by the samevalue algorithm in ecmascript 262, 5th edition.
... samevalue slightly differs from strict equality (===) in that +0 and -0 are not the same and in that nan is the same as nan.
... the samevalue algorithm is equivalent to the following javascript: function samevalue(v1, v2) { if (v1 === 0 && v2 === 0) return 1 / v1 === 1 / v2; if (v1 !== v1 && v2 !== v2) return true; return v1 === v2; } syntax // added in spidermonkey 45 bool js_samevalue(jscontext *cx, js::handle<js::value> v1, js::handle<js::value> v2, bool *same); // obsolete since jsapi 39 bool js_samevalue(jscontext *cx, jsval v1, jsval v2, bool *same); name type description cx jscontext * pointer to a js context from which to derive runtime information.
...And 2 more matches
CSSStyleValue - Web APIs
the cssstylevalue interface of the the css typed object model api is the base class of all css values accessible through the typed om api.
... interfaces based on cssstylevalue below is a list of interfaces based on the cssstylevalue interface.
... cssimagevalue csskeywordvalue cssnumericvalue csspositionvalue csstransformvalue cssunparsedvalue methods cssstylevalue.parse() sets a specific css property to the specified values and returns the first value as a cssstylevalue object.
...And 2 more matches
CSSVariableReferenceValue - Web APIs
the cssvariablereferencevalue interface of the css typed object model api allows you to create a custom name for a built-in css value.
... constructor cssvariablereferencevalue.cssvariablereferencevalue() creates a new cssvariablereferencevalue object.
... properties cssvariablereferencevalue.variable returns the custom name passed to the constructor.
...And 2 more matches
XPathEvaluator.createExpression() - Web APIs
this method compiles an xpathexpression which can then be used for (repeated) evaluations of the xpath expression.
... syntax xpathexpression xpathevaluator.createexpression(expression, resolver); parameters expression a domstring representing representing the xpath expression to be created.
... exceptions invalid_expression_err if the expression is not legal according to the rules of the xpathevaluator, an xpathexception of type invalid_expression_err is raised.
...And 2 more matches
EvalError() constructor - JavaScript
the evalerror constructor creates a new error regarding the global eval() function.
... this exception is not thrown by javascript anymore, however the evalerror object remains for compatibility.
... syntax new evalerror([message[, filename[, linenumber]]]) parameters message optional.
...And 2 more matches
Object.prototype.eval() - Archive of obsolete content
the object.eval() method used to evaluate a string of javascript code in the context of an object, however, this method has been removed.
... syntax obj.eval(string) parameters string any string representing a javascript expression, statement, or sequence of statements.
... description the eval method can no longer be used as a method of an object.
... use the top-level eval() function instead.
FC_GetAttributeValue
name fc_getattributevalue - get the value of attributes of an object.
... syntax ck_rv fc_getattributevalue( ck_session_handle hsession, ck_object_handle hobject, ck_attribute_ptr ptemplate, ck_ulong uscount ); parameters hsession [in] session handle.
... description fc_getattributevalue gets the value of one or more attributes of an object.
... return value examples see also nsc_getattributevalue ...
FC_SetAttributeValue
name fc_setattributevalue - set the values of attributes of an object.
... syntax ck_rv fc_setattributevalue( ck_session_handle hsession, ck_object_handle hobject, ck_attribute_ptr ptemplate, ck_ulong uscount ); parameters hsession [in] session handle.
... description fc_setattributevalue sets the value of one or more attributes of an object.
... return value examples see also nsc_setattributevalue ...
JS_IsBuiltinEvalFunction
this article covers features introduced in spidermonkey 17 return whether the given function is the global eval function.
... syntax bool js_isbuiltinevalfunction(jsfunction *fun); name type description obj jsfunction * pointer to the function to test.
... description js_isbuiltinevalfunction returns whether the given function is the global eval function.
... see also mxr id search for js_isbuiltinevalfunction js_isbuiltinfunctionconstructor bug 638312 ...
JS_NewDoubleValue
create a floating-point jsval syntax jsbool js_newdoublevalue(jscontext *cx, jsdouble d, jsval *rval); name type description cx jscontext * the context in which to create the new number.
... description js_newdoublevalue creates a floating-point jsval.
...if it is, js_newdoublevalue creates a bad jsval that might behave as desired in some cases but not others.
...on success, js_newdoublevalue stores a numeric jsval in *rval and returns js_true.
writeValue() - Web APIs
the bluetoothremotegattdescriptor.writevalue() method sets the value property to the bytes contained in an arraybuffer and returns a promise.
... syntax bluetoothremotegattdescriptor.writevalue(array[]).then(function() { ...
... specifications specification status comment web bluetooththe definition of 'writevalue()' in that specification.
... desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetwritevalue experimentalchrome full support 57notes full support 57notes notes macos only.
CSSStyleValue.parse() - Web APIs
the parse() method of the cssstylevalue interface sets a specific css property to the specified values and returns the first value as a cssstylevalue object.
... syntax cssstylevalue.parse(property, csstext) parameters property a css property to set.
... return value a cssstylevalue object containing the first supplied value.
... const css = cssstylevalue.parse( 'transform', 'translate3d(10px,10px,0) scale(0.5)'); csstransformvalue {0: csstranslate, 1: cssscale, length: 2, is2d: false} specifications specification status comment css typed om level 1the definition of 'parse()' in that specification.
XPathResult.singleNodeValue - Web APIs
the read-only singlenodevalue property of the xpathresult interface returns a node value or null in case no node was matched of a result with xpathresult.resulttype being any_unordered_node_type or first_ordered_node_type.
... syntax var value = result.singlenodevalue; return value the return value is the node value of the xpathresult returned by document.evaluate().
... example the following example shows the use of the singlenodevalue property.
... html <div>xpath example</div> <div>tag name of the element having the text content 'xpath example': <output></output></div> javascript var xpath = "//*[text()='xpath example']"; var result = document.evaluate(xpath, document, null, xpathresult.first_ordered_node_type, null); document.queryselector("output").textcontent = result.singlenodevalue.localname; result specifications specification status comment document object model (dom) level 3 xpath specificationthe definition of 'xpathresult.singlenodevalue' in that specification.
uneval() - JavaScript
the uneval() function creates a string representation of the source code of an object.
... syntax uneval(object) parameters object a javascript expression or statement.
... description uneval() is a top-level function and is not associated with any object.
... examples using uneval var a = 1; uneval(a); // returns a string containing 1 var b = '1'; uneval(b); // returns a string containing "1" uneval(function foo() {}); // returns "(function foo(){})" var a = uneval(function foo() { return 'hi'; }); var foo = eval(a); foo(); // returns "hi" specifications not part of any standard.
tableValues - SVG: Scalable Vector Graphics
the tablevalues attribute defines a list of numbers defining a lookup table of values for a for a color component transfer function.
...radient id="gradient" gradientunits="userspaceonuse" x1="0" y1="0" x2="200" y2="0"> <stop offset="0" stop-color="#ff0000" /> <stop offset="0.5" stop-color="#00ff00" /> <stop offset="1" stop-color="#0000ff" /> </lineargradient> </defs> <filter id="componenttransfer1" x="0" y="0" width="100%" height="100%"> <fecomponenttransfer> <fefuncr type="table" tablevalues="0 1"/> <fefuncg type="table" tablevalues="0 1"/> <fefuncb type="table" tablevalues="0 1"/> </fecomponenttransfer> </filter> <filter id="componenttransfer2" x="0" y="0" width="100%" height="100%"> <fecomponenttransfer> <fefuncr type="table" tablevalues="1 0"/> <fefuncg type="table" tablevalues="1 0"/> <fefuncb type="table" tablevalues="1 0"/> </fec...
... specifications specification status comment filter effects module level 1the definition of 'tablevalues' in that specification.
... working draft no change scalable vector graphics (svg) 1.1 (second edition)the definition of 'tablevalues' in that specification.
Mozilla’s UAAG evaluation report
this uaag evaluation report covers nightly builds of the mozilla web browser itself, running on windows 2000, as of february 20, 2002.
...this evaluation does not cover mailnews or composer.
...(p1) nr some end user docs are under help, help contents in mozilla here is the main page for mozilla end user documentation none of these resources have been evaluated for wcag compliance 12.2 document accessibility features.
JS::DoubleValue
syntax js::value js::doublevalue(double dbl) name type description dbl double c double to convert.
... description js::doublevalue converts a c floating-point number of type double to js::value, the type of javascript values.
... see also mxr id search for js::doublevalue js::value js::int32value js::float32value js::numbervalue js_numbervalue ...
mozIStorageValueArray
the mozistoragevaluearray interface obtains provides methods to obtain data from a given result.
... storage/public/mozistoragevaluearray.idlscriptable please add a summary to this article.
... return value one of the constants mozistoragevaluearray.value_type_null, mozistoragevaluearray.value_type_integer, mozistoragevaluearray.value_type_float, mozistoragevaluearray.value_type_text, or mozistoragevaluearray.value_type_blob describing the type aindex is.
Debug eval sources - Firefox Developer Tools
you can debug javascript code that is evaluated dynamically, either as a string passed to eval() or as a string passed to the function constructor.
... in the video below, we load a page containing a source like this: var script = `function foo() { console.log('called foo'); } //# sourceurl=my-foo.js`; eval(script); var button = document.getelementbyid("foo"); button.addeventlistener("click", foo, false); the evaluated string is given the name "my-foo.js" using the //# sourceurl directive.
... the debugger will also stop at debugger; statements in unnamed eval sources.
BluetoothRemoteGATTCharacteristic.writeValue() - Web APIs
the bluetoothremotegattcharacteristic.writevalue() method sets the value property to the bytes contained in an arraybuffer and returns a promise.
... syntax bluetoothremotegattcharacteristic.writevalue(value).then(function() { ...
... specifications specification status comment web bluetooththe definition of 'writevalue()' in that specification.
CSSImageValue - Web APIs
the cssimagevalue interface of the css typed object model api represents values for properties that take an image, for example background-image, list-style-image, or border-image-source.
... the cssimagevalue object represents an <image> that involves an url, such as url() or image(), but not linear-gradient() or element() .
...we then get() the background-image from the stylemap and stringify it: // get the element const button = document.queryselector( 'button' ); // retrieve all computed styles with computedstylemap() const allcomputedstyles = button.computedstylemap(); // return the cssimagevalue example console.log( allcomputedstyles.get('background-image') ); console.log( allcomputedstyles.get('background-image').tostring() ); specifications specification status comment css typed om level 1the definition of 'cssimagevalue' in that specification.
CSSPrimitiveValue.getCounterValue() - Web APIs
the getcountervalue() method of the cssprimitivevalue interface is used to get the counter value.
... syntax var countervalue = cssprimitivevalue.getcountervalue(); return value a counter object representing the counter value.
... specifications specification status comment document object model (dom) level 2 style specificationthe definition of 'cssprimitivevalue.getcountervalue' in that specification.
CSSPrimitiveValue.getFloatValue() - Web APIs
the getfloatvalue() method of the cssprimitivevalue interface is used to get a float value in a specified unit.
... syntax var floatvalue = cssprimitivevalue.getfloatvalue(unit); parameters unittype an unsigned short representing the code for the unit type, in which the value should be returned.
... example var cs = window.getcomputedstyle(document.body); var cssvalue = cs.getpropertycssvalue("margin-top"); console.log(cssvalue.getfloatvalue(cssprimitivevalue.css_cm)); specifications specification status comment document object model (dom) level 2 style specificationthe definition of 'cssprimitivevalue.getfloatvalue' in that specification.
CSSPrimitiveValue.getRGBColorValue() - Web APIs
the getrgbcolorvalue() method of the cssprimitivevalue interface is used to get an rgb color value.
... syntax var rgbcolorvalue = cssprimitivevalue.getrgbcolorvalue(); return value an rgbcolor object representing the color value.
... example var cs = window.getcomputedstyle(document.body); var cssvalue = cs.getpropertycssvalue("color"); console.log(cssvalue.getrgbcolorvalue()); specifications specification status comment document object model (dom) level 2 style specificationthe definition of 'cssprimitivevalue.getrgbcolorvalue' in that specification.
CSSPrimitiveValue.getRectValue() - Web APIs
the getrectvalue() method of the cssprimitivevalue interface is used to get a rect value.
... syntax var rectvalue = cssprimitivevalue.getrectvalue(); return value a rect object representing the rect value.
... example var cs = window.getcomputedstyle(document.getelementbyid("clippeddiv")); var cssvalue = cs.getpropertycssvalue("clip"); console.log(cssvalue.getrectvalue()); specifications specification status comment document object model (dom) level 2 style specificationthe definition of 'cssprimitivevalue.getrectvalue' in that specification.
CSSPrimitiveValue.getStringValue() - Web APIs
the getstringvalue() method of the cssprimitivevalue interface is used to get a string value.
... syntax var stringvalue = cssprimitivevalue.getstringvalue(); return value a string value.
... example var cs = window.getcomputedstyle(document.body); var cssvalue = cs.getpropertycssvalue("display"); console.log(cssvalue.getstringvalue()); specifications specification status comment document object model (dom) level 2 style specificationthe definition of 'cssprimitivevalue.getstringvalue' in that specification.
CSSPrimitiveValue.primitiveType - Web APIs
the primitivetype read-only property of the cssprimitivevalue interface represents the type of a css value.
... syntax type = cssprimitivevalue.primitivetype; value an unsigned short representing the type of the value.
... example var cs = window.getcomputedstyle(document.body); var cssvalue = cs.getpropertycssvalue("color"); console.log(cssvalue.primitivetype); specifications specification status comment document object model (dom) level 2 style specificationthe definition of 'cssprimitivevalue.primitivetype' in that specification.
CSSPrimitiveValue.setFloatValue() - Web APIs
the setfloatvalue() method of the cssprimitivevalue interface is used to set a float value.
... syntax cssprimitivevalue.setfloatvalue(unittype, floatvalue); parameters unittype an unsigned short representing the code for the unit type, in which the value should be returned.
... specifications specification status comment document object model (dom) level 2 style specificationthe definition of 'cssprimitivevalue.setfloatvalue' in that specification.
CSSPrimitiveValue.setStringValue() - Web APIs
the setstringvalue() method of the cssprimitivevalue interface is used to set a string value.
... syntax cssprimitivevalue.setstringvalue(stringtype, stringvalue); parameters stringtype an unsigned short representing the type of the value.
... specifications specification status comment document object model (dom) level 2 style specificationthe definition of 'cssprimitivevalue.setstringvalue' in that specification.
CSSStyleValue.parseAll() - Web APIs
the parseall() method of the cssstylevalue interface sets all occurences of a specific css property to the specified value and returns an array of cssstylevalue objects, each containing one of the supplied values.
... syntax cssstylevalue.parseall(property, value) parameters property a css property to set.
... return value an array of cssstylevalue objects, each containing one of the supplied values.
CSSVariableReferenceValue() - Web APIs
creates a new cssvariablereferencevalue.
... syntax new cssvariablereferencevalue(variable[, fallback]]) parameters variable a custom property name.
... specifications specification status comment css typed om level 1the definition of 'cssvariablereferencevalue()' in that specification.
XPathEvaluator.createNSResolver() - Web APIs
this method adapts any dom node to resolve namespaces so that an xpath expression can be easily evaluated relative to the context of the node where it appeared within the document.
... syntax xpathnsresolver xpathevaluator.creatensresolver(noderesolver); parameters noderesolver a node to be used as a context for namespace resolution.
... specifications specification status comment document object model (dom) level 3 xpath specificationthe definition of 'xpathevaluator.creatensresolver()' in that specification.
deleteValue - Archive of obsolete content
deletevalue removes the value of an arbitrary key.
... method of winreg object syntax int deletevalue ( string subkey, string valname); parameters the deletevalue method has the following parameters: subkey the key path to the appropriate location in the key hierarchy, such as "software\\netscape\\navigator\\mail".
PL_CompareValues
syntax #include <plhash.h> printn pl_comparevalues(const void *v1, const void *v2); description pl_comparevalues compares the two void * values v1 and v2 numerically, i.e., it returns the value of the expression v1 == v2.
... pl_comparevalues can be used as the comparator function for integer or pointer-valued key or entry value.
JS::FalseValue
syntax js::value js::falsevalue() description js::falsevalue creates a js::value that represents the javascript value false.
... see also mxr id search for js::falsevalue js::value js::booleanvalue js::truevalue ...
JS::NullHandleValue
syntax const js::handlevalue js::nullhandlevalue; description js::nullhandlevalue is a js::handlevalue constant that represents the javascript value null.
... see also mxr id search for js::nullhandlevalue js::undefinedhandlevalue js::truehandlevalue js::falsehandlevalue bug 865969 ...
JS::TrueHandleValue
syntax const js::handlevalue js::truehandlevalue; const js::handlevalue js::falsehandlevalue; description js::truehandlevalue and js::falsehandlevalue are js::handlevalue constants that represent the javascript values true and false.
... see also mxr id search for js::truehandlevalue mxr id search for js::falsehandlevalue js::nullhandlevalue js::undefinedhandlevalue bug 959787 ...
JS::TrueValue
syntax js::value js::truevalue() description js::truevalue creates a js::value that represents the javascript value true.
... see also mxr id search for js::truevalue js::value js::booleanvalue js::falsevalue ...
JS::UndefinedHandleValue
syntax const js::handlevalue js::undefinedhandlevalue; description js::undefinedhandlevalue is a js::handlevalue constant that represents the javascript value undefined.
... see also mxr id search for js::undefinedhandlevalue js::nullhandlevalue js::truehandlevalue js::falsehandlevalue bug 865969 ...
IAccessibleValue
other-licenses/ia2/accessiblevalue.idlnot scriptable this interface gives access to a single numerical value.
... 1.0 66 introduced gecko 1.9 inherits from: iunknown last changed in gecko 1.9 (firefox 3) the iaccessiblevalue interface represents a single numerical value and should be implemented by any class that supports numerical value like progress bars and spin boxes.
CSSVariableReferenceValue.fallback - Web APIs
the fallback read-only property of the cssvariablereferencevalue interface returns the custom property fallback value of the cssvariablereferencevalue.
... syntax var fallback = cssvariablereferencevalue.fallback; value a cssunparsedvalue.
CSSVariableReferenceValue.variable - Web APIs
the variable property of the cssvariablereferencevalue interface returns the custom property name of the cssvariablereferencevalue.
... syntax var variable = cssvariablereferencevalue.variable; value a usvstring beginning with -- (that is, a custom property name).
SVGAnimatedString.baseVal - Web APIs
baseval gets or sets the base value of the given attribute before any animations are applied.the base value of the given attribute before applying any animations.
... desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetbasevalchrome full support yesedge full support 12firefox full support yesie no support noopera full support yessafari full support yeswe...
dateValue - Archive of obsolete content
« xul reference datevalue type: date the date that is currently entered or selected in the datepicker as a date object.
Information for Governments and Other Organizations Evaluating Mozilla
mozilla's w3c user agent guidelines evaluation report w3c's wai is advancing another important set of accessibility standards called uaag.
GetComputedStyleValue
this content is now available at nsiaccessnode.getcomputedstylevalue().
nsIAccessibleRetrieval
accessible/public/nsiaccessibleretrieval.idlscriptable an interface for in-process accessibility clients wishing to get an nsiaccessible or nsiaccessnode for a given dom node.
nsIAccessibleValue
accessible/public/nsiaccessiblevalue.idlscriptable please add a summary to this article.
nsMsgSearchTypeValue
defined in comm-central/ mailnews/ base/ search/ public/ nsmsgsearchcore.idl used to specify type of search to be performed [scriptable,uuid(964b7f32-304e-11d3-ae13-00a0c900d445)] interface nsmsgsearchtype { const nsmsgsearchtypevalue none = 0; const nsmsgsearchtypevalue rootdse = 1; const nsmsgsearchtypevalue normal = 2; const nsmsgsearchtypevalue ldapvlv = 3; const nsmsgsearchtypevalue namecompletion = 4; }; ...
Bytecode Descriptions
double operands: (double val) stack: ⇒ val push the 64-bit floating-point immediate operand as a doublevalue.
...implements: relational operators: evaluation.
...format: jof_ic conversions topropertykey stack: propertynamevalue ⇒ propertykey convert a value to a property key.
...And 42 more matches
Index - Web APIs
WebAPIIndex
332 bluetoothremotegattcharacteristic.writevalue() api, bluetooth, bluetoothremotegattcharacteristic, experimental, property, reference, web bluetooth api, writevalue the bluetoothremotegattcharacteristic.writevalue() method sets the value property to the bytes contained in an arraybuffer and returns a promise.
... 338 writevalue() api, bluetooth, bluetoothgattdescriptor, bluetoothremotegattdescriptor, experimental, property, reference, web bluetooth api, writevalue() the bluetoothremotegattdescriptor.writevalue() method sets the value property to the bytes contained in an arraybuffer and returns a promise.
... 406 cssimagevalue api, css typed object model api, cssimagevalue, experimental, houdini, interface, reference the cssimagevalue interface of the css typed object model api represents values for properties that take an image, for example background-image, list-style-image, or border-image-source.
...And 39 more matches
Introduction to using XPath in JavaScript - XPath
the main interface to using xpath is the evaluate function of the document object.
... document.evaluate this method evaluates xpath expressions against an xml based document (including html documents), and returns a xpathresult object, which can be a single node or a set of nodes.
... the existing documentation for this method is located at document.evaluate, but it is rather sparse for our needs at the moment; a more comprehensive examination will be given below.
...And 28 more matches
Expressions and operators - JavaScript
when chaining these expressions, each assignment is evaluated right-to-left.
...~x evaluates to the same value that -x - 1 evaluates to.
... examples of expressions that can be converted to false are those that evaluate to null, 0, nan, the empty string (""), or undefined.
...And 19 more matches
LiveConnect Overview - Archive of obsolete content
the forname method throws an exception if the value you pass it does not evaluate to the name of a java class.
... place the forname assignment statement in a try block to handle the exception, as follows: function getclass(javaclassname) { try { var theclass = java.lang.class.forname(javaclassname); } catch (e) { return ("the java exception is " + e); } return theclass; } in this example, if javaclassname evaluates to a legal class name, such as "java.lang.string", the assignment succeeds.
... if javaclassname evaluates to an invalid class name, such as "string", the getclass function catches the exception and returns something similar to the following: the java exception is java.lang.classnotfoundexception: string for specialized handling based on the exception type, use the instanceof operator: try { // ...
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Debugger.Frame - Firefox Developer Tools
gee and debugger share the same javascript stack, frames pushed for spidermonkey’s calls to handler methods to report events in the debuggee are never considered visible frames.) invocation functions and “debugger” frames aninvocation function is any function in this interface that allows the debugger to invoke code in the debuggee: debugger.object.prototype.call, debugger.frame.prototype.eval, and so on.
...for example, debugger.frame.prototype.eval pushes an "eval" frame for code it runs, whereas debugger.object.prototype.call pushes a "call" frame.
...(we may not be able to obtain frames for calls to host functions.) "eval": a frame running code passed to eval.
...And 14 more matches
Index
this is typically used for local variables being passed to function which requires js::handlevaluearray or a pointer to js::value array.
... 40 js::doublevalue jsapi reference, reference, référence(2), spidermonkey js::doublevalue converts a c floating-point number of type double to js::value, the type of javascript values.
... 41 js::evaluate jsapi reference, reference, référence(2), spidermonkey js::evaluate compiles and executes a script in the specified scope, obj or scopechain.
...And 13 more matches
nsIMsgDBView
method overview void open(in nsimsgfolder folder, in nsmsgviewsorttypevalue sorttype, in nsmsgviewsortordervalue sortorder, in nsmsgviewflagstypevalue viewflags, out long count); void openwithhdrs(in nsisimpleenumerator aheaders, in nsmsgviewsorttypevalue asorttype, in nsmsgviewsortordervalue asortorder, in nsmsgviewflagstypevalue aviewflags, out long acount); void close(); void init(in nsimessenger amessengerinstance, in nsimsgwindow amsgwin...
...dow, in nsimsgdbviewcommandupdater acommandupdater); void sort(in nsmsgviewsorttypevalue sorttype, in nsmsgviewsortordervalue sortorder); void docommand(in nsmsgviewcommandtypevalue command); void docommandwithfolder(in nsmsgviewcommandtypevalue command, in nsimsgfolder destfolder); void getcommandstatus(in nsmsgviewcommandtypevalue command, out boolean selectable_p, out nsmsgviewcommandcheckstatevalue selected_p); void viewnavigate(in nsmsgnavigationtypevalue motion, out nsmsgkey resultid, out nsmsgviewindex resultindex, out nsmsgviewindex threadindex, in boolean wrap); boolean navigatestatus(in nsmsgnavigationtypevalue motion); nsmsgkey getkeyat(in nsmsgviewindex index); nsimsgdbhdr getmsghdrat(in nsmsgviewindex index); ...
... void expandandselectthreadbyindex(in nsmsgviewindex aindex, in boolean aaugment); void addcolumnhandler(in astring acolumn, in nsimsgcustomcolumnhandler ahandler); void removecolumnhandler(in astring acolumn); nsimsgcustomcolumnhandler getcolumnhandler(in astring acolumn); attributes attribute type description viewtype nsmsgviewtypevalue readonly: type of view.
...And 12 more matches
Shell global objects
console an object that has following property: log evaluate and print expressions to stdout.
... evaluate(code[, options]) evaluate code as though it were the contents of a file.
... print([exp ...]) evaluate and print expressions to stdout.
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Debugger.Object - Firefox Developer Tools
while most debugger.object instances are created by spidermonkey in the process of exposing debuggee’s behavior and state to the debugger, the debugger can use debugger.object.prototype.makedebuggeevalue to create debugger.object instances for given debuggee objects, or use debugger.object.prototype.copy and debugger.object.prototype.create to create new objects in debuggee compartments, allocated as if by particular debuggee globals.
... this accessor returns whatever name appeared after the function keyword in the source code, regardless of whether the function is the result of instantiating a function declaration (which binds the function to its name in the enclosing scope) or evaluating a function expression (which binds the function to its name only within the function’s body).
... promisevalue return a debuggee value representing the value the promise has been fulfilled with.
...And 11 more matches
Strict mode - JavaScript
eval code, function code, event handler attributes, strings passed to windowtimers.settimeout(), and related functions are entire scripts, and invoking strict mode in them works as expected.
...changes generally fall into these categories: changes converting mistakes into errors (as syntax errors or at runtime), changes simplifying how the particular variable for a given use of a name is computed, changes simplifying eval and arguments, changes making it easier to write "secure" javascript, and changes anticipating future ecmascript evolution.
... second, eval of strict mode code does not introduce new variables into the surrounding scope.
...And 11 more matches
JSAPI reference
locale callback types: jslocaletouppercase jslocaletolowercase jslocalecompare jslocaletounicode scripts just running some javascript code is straightforward: class js::compileoptions added in spidermonkey 17 class js::owningcompileoptions added in spidermonkey 31 class js::readonlycompileoptions added in spidermonkey 31 class js::sourcebufferholder added in spidermonkey 31 js::evaluate added in spidermonkey 17 js_evaluatescript obsolete since jsapi 36 js_evaluateucscript obsolete since jsapi 36 js_evaluatescriptforprincipals obsolete since jsapi 30 js_evaluateucscriptforprincipals obsolete since jsapi 30 js_evaluatescriptforprincipalsversion obsolete since jsapi 30 js_evaluateucscriptforprincipalsversion obsolete since jsapi 30 you can instead compile javascript ...
...ropexceptionstate these functions translate errors into exceptions and vice versa: js_reportpendingexception js_errorfromexception js_throwreportederror obsolete since jsapi 29 values and types typedef jsval js::value js::value constructors: js::nullvalue added in spidermonkey 24 js::undefinedvalue added in spidermonkey 24 js::booleanvalue added in spidermonkey 24 js::truevalue added in spidermonkey 24 js::falsevalue added in spidermonkey 24 js::numbervalue added in spidermonkey 24 js::int32value added in spidermonkey 24 js::doublevalue added in spidermonkey 24 js::float32value added in spidermonkey 24 js::stringvalue added in spidermonkey 24 js::objectvalue added in spidermonkey 24 js::objectornullvalue added in spidermonkey 24 js::symbolvalue added in spide...
...rmonkey 38 js::value constants: js::nullhandlevalue added in spidermonkey 24 js::undefinedhandlevalue added in spidermonkey 24 js::truehandlevalue added in spidermonkey 38 js::falsehandlevalue added in spidermonkey 38 jsval constants: jsval_null obsolete since jsapi 42 jsval_void obsolete since jsapi 42 jsval_true obsolete since jsapi 42 jsval_false obsolete since jsapi 42 jsval_zero obsolete since jsapi 42 jsval_one obsolete since jsapi 42 function and macros for checking the type of a jsval: enum jstype js_typeofvalue all of the following are deprecated.
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Index
MozillaTechXPCOMIndex
31 components.utils.sandbox needsmarkupwork, reference, référence(2), xpcom:language bindings, xpconnect components.utils.sandbox is used to create a sandbox object for use with evalinsandbox().
... 34 components.utils.evalinsandbox add-ons, developing mozilla, extensions, javascript, xpcom:language bindings, xpconnect the evalinsandbox() function enables you to evaluate javascript code inside a sandbox you've previously created using the components.utils.sandbox constructor.
... 35 components.utils.evalinwindow this function enables code running in a more-privileged javascript context to evaluate a string in a less-privileged javascript context.
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Debugger.Object - Firefox Developer Tools
while most debugger.object instances are created by spidermonkey in the process of exposing debuggee's behavior and state to the debugger, the debugger can use debugger.object.prototype.makedebuggeevalue to create debugger.object instances for given debuggee objects, or use debugger.object.prototype.copy and debugger.object.prototype.create to create new objects in debuggee compartments, allocated as if by particular debuggee globals.
... this accessor returns whatever name appeared after the function keyword in the source code, regardless of whether the function is the result of instantiating a function declaration (which binds the function to its name in the enclosing scope) or evaluating a function expression (which binds the function to its name only within the function's body).
... setproperty(name,value) storevalue as the value of the referent's property namedname, creating the property if it does not exist.name must be a string;value must be a debuggee value.
...And 9 more matches
XPath snippets - XPath
node-specific evaluator function the following custom utility function can be used to evaluate xpath expressions on given xml nodes.
... example: defining a custom node-specific evaluatexpath() utility function // evaluate an xpath expression aexpression against a given dom node // or document object (anode), returning the results as an array // thanks wanderingstan at morethanwarm dot mail dot com for the // initial work.
... function evaluatexpath(anode, aexpr) { var xpe = new xpathevaluator(); var nsresolver = xpe.creatensresolver(anode.ownerdocument == null ?
...And 9 more matches
loader/sandbox - Archive of obsolete content
usage create a sandbox to create a sandbox: const { sandbox, evaluate, load } = require("sdk/loader/sandbox"); let scope = sandbox('http://example.com'); the argument passed to the sandbox defines its privileges.
... evaluate code module provides evaluate function that lets you execute code in the given sandbox: evaluate(scope, 'var a = 5;'); evaluate(scope, 'a + 2;'); //=> 7 more details about evaluated script may be passed via optional arguments that may improve exception reporting: // evaluate code as if it was loaded from 'http://foo.com/bar.js' and // start from 2nd line.
... evaluate(scope, 'a ++', 'http://foo.com/bar.js', 2); version of javascript can be also specified via an optional argument: evaluate(scope, 'let b = 2;', 'bar.js', 1, '1.5'); // throws cause `let` is not defined in js 1.5.
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nsIXPConnect
nsistackframe createstackframelocation(in pruint32 alanguage, in string afilename, in string afunctionname, in print32 alinenumber, in nsistackframe acaller); void debugdump(in short depth); void debugdumpevalinjsstackframe(in pruint32 aframenumber, in string asourcetext); void debugdumpjsstack(in prbool showargs, in prbool showlocals, in prbool showthisprops); void debugdumpobject(in nsisupports acomobj, in short depth); [noscript,notxpcom] prbool definedomquickstubs(in jscontextptr cx, in jsobjectptr proto, in pruint32 flags, in pruint32 interfacecount, [array, size_is(inte...
...rfacecount)] in nsiidptr interfacearray); jsval evalinsandboxobject(in astring source, in jscontextptr cx, in nsixpconnectjsobjectholder sandbox, in prbool returnstringonly); native code only!
... exceptions thrown missing exception missing description native code only!createsandbox create a sandbox for evaluating code in isolation using evalinsandboxobject().
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Web Console remoting - Firefox Developer Tools
the new web console actors are: the webconsoleactor allows js evaluation, autocomplete, start/stop listeners, etc.
... javascript evaluation the evaluatejs request and response packets the web console client provides the evaluatejs(requestid, string, onresponse) method which sends the following packet: { "to": "conn0.console9", "type": "evaluatejs", "text": "document", "bindobjectactor": null, "frameactor": null, "url": null, "selectednodeactor": null, } the bindobjectactor property is an optional objectactor ...
...this option allows you to bind _self to the debugger.object of the given object actor, during string evaluation.
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Using the CSS Typed Object Model - Web APIs
there are other types available: an <image> will return a cssimagevalue.
... a <color> would return a cssstylevalue.
...for example, the parameters for a csspositionvalue is one to two cssunitvalues or csskeywordvalues, or one of each: let position = new csspositionvalue( new csskeywordvalue("center"), new cssunitvalue(10, "px")); cssstylevalue the cssstylevalue interface of the the css typed object model api is the base class of all css values accessible through the typed om api, including cssimagevalue, csskeywordvalue, cssnumericvalue, csspositionvalue, csstransformvalue, and cssunparsedvalue.
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Equality comparisons and sameness - JavaScript
there are four equality algorithms in es2015: abstract equality comparison (==) strict equality comparison (===): used by array.prototype.indexof, array.prototype.lastindexof, and case-matching samevaluezero: used by %typedarray% and arraybuffer constructors, as well as map and set operations, and also string.prototype.includes and array.prototype.includes since es2016 samevalue: used in all other places javascript provides three different value-comparison operations: === - strict equality comparison ("strict equality", "identity", "triple equals") == - abstract equality comparison ("loose equality", "double equals") object.is provides samevalue (new in es2015).
...for any non-primitive objects x and y which have the same structure but are distinct objects themselves, all of the above forms will evaluate to false.
...loose equality is one such context: null == a and undefined == a evaluate to true if, and only if, a is an object that emulates undefined.
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Appendix D: Loading Scripts - Archive of obsolete content
<?xml version="1.0" encoding="utf-8"?> <!doctype overlay> <overlay id="script-overlay" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <script type="application/javascript;version=1.8" src="overlay.js"/> </overlay> evalinsandbox the components.utils.evalinsandbox method may be used to load arbitrary code into components.utils.sandbox objects.
... advantages namespacing: since scripts executed via evalinsandbox run in a defined namespace, global namespace contamination and the resultant extension compatibility issues are not usually a problem.
... flexibility: the evalinsandbox method accepts several parameters, including the url, line number, and javascript version of the file from which the code being evaluated was extracted.
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Assert.jsm
undefined ok( actual, message ); parameters actual test subject to be evaluated as truthy message short explanation of the expected result equal() the equality assertion tests shallow, coercive equality with ==.
... undefined equal( actual, expected, message ); parameters actual test subject to be evaluated as equivalent to expected expected test reference to evaluate against actual message short explanation of the expected result notequal() the non-equality assertion tests for whether two objects are not equal with !=.
... undefined notequal( actual, expected, message ); parameters actual test subject to be evaluated as not equivalent to expected expected test reference to evaluate against actual message short explanation of the expected result deepequal() the equivalence assertion tests a deep equality relation.
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nsIDOMXPathResult
dom/interfaces/xpath/nsidomxpathresult.idlscriptable this interface describes an xpath result returned by nsidomxpathevaluator or document.evaluate inherits from: nsisupports last changed in gecko 1.7 method overview nsidomnode iteratenext(); nsidomnode snapshotitem(in unsigned long index); attributes attribute type description booleanvalue boolean if resulttype is boolean_type, the boolean value.
... singlenodevalue nsidomnode if resulttype is any_unordered_node_type or first_ordered_node_type, a single dom node.
... constants type constants constant value description any_type 0 used when evaluating an xpath expression; the evaluator will return the most appropriate type.
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Cache-Control - HTTP
cache-control: must-revalidate cache-control: no-cache cache-control: no-store cache-control: no-transform cache-control: public cache-control: private cache-control: proxy-revalidate cache-control: max-age=<seconds> cache-control: s-maxage=<seconds> extension cache-control directives extension cache-control directives are not part of the core http caching standards document.
... cache-control: immutable cache-control: stale-while-revalidate=<seconds> cache-control: stale-if-error=<seconds> directives cacheability a response is normally cached by the browser if: it has a status code of 301, 302, 307, 308, or 410 and cache-control does not have no-store, or if proxy, does not have private and authorization is unset either has a status code of 301, 302, 307, 308, or 410 or has public, max-age or s-maxage in cache-control or has expires set public the response may be stored by any cache, even if the response is normally non-cacheable.
...setting must-revalidate does not make sense because in order to go through revalidation you need the response to be stored in a cache, which no-store prevents.
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Proxy Auto-Configuration (PAC) file - HTTP
examples: function alert_eval(str) { alert(str + ' is ' + eval(str)) } function findproxyforurl(url, host) { alert_eval('isinnet(host, "63.245.213.24", "255.255.255.255")') // "pac-alert: isinnet(host, "63.245.213.24", "255.255.255.255") is true" } dnsresolve() dnsresolve(host) parameters host hostname to resolve.
... examples shexpmatch("http://home.netscape.com/people/ari/index.html" , "*/ari/*"); // returns true shexpmatch("http://home.netscape.com/people/montulli/index.html", "*/ari/*"); // returns false weekdayrange() syntax weekdayrange(wd1, wd2, [gmt]) note: (before firefox 49) wd1 must be less than wd2 if you want the function to evaluate these parameters as a range.
... the order of the days matters; before firefox 49, weekdayrange("sun", "sat") will always evaluate to true.
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Microsummary XML grammar reference - Archive of obsolete content
when a generator is examined to determine whether or not it is able to summarize a page, the regular expressions provided by the child elements are evaluated against the url of the page.
...white space between the child element tags and the regular expressions they contain is also not significant; it is not considered part of the regular expression, and it does not affect evaluation of the expressions.
... child elements: <condition> (optional) an xpath boolean expression along with a conditional interval of time, in minutes, that must elapse between updates if the expression evaluates to true.
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JSAPI User Guide
each time the application runs a js script (using, for example, js_evaluatescript), it provides the global object for that script to use.
...similarly, you can create a js::value wrapping a jsobject, double, or jsstring pointer to a js::value using js::objectvalue(jsobject&), js::doublevalue(double), or js::stringvalue(jsstring*).
... error reports todo your custom errorreporter todo when errors are reported automatic handling of uncaught exceptions the js_compile*, js_call*, js_execute*, and js_evaluate* functions automatically pass exceptions to the error reporter in certain cases.
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Working with Multiple Versions of Interfaces
to do this i used the accessibility framework: hwnd gethwnd(nsidomnode *node){ hwnd self = null; nsresult rv; nscomptr<nsiaccessibleretrieval> refp; refp = do_createinstance( "@mozilla.org/accessibleretrieval;1", &rv); if (ns_failed(rv)){ return self; } //line 6.
...this is because the call to do_createinstance(acid, aouter, error); will eventually evolve into a request for an object supporting the interface with iid ns_get_iid(nsiaccessibleretrieval).
... hwnd gethwndb(nsidomnode *node){ hwnd self = null; nsresult rv; nscomptr<nsicomponentmanager> compmgr; rv = ns_getcomponentmanager(getter_addrefs(compmgr)); if (ns_failed(rv)){ return self; } nscomptr<nsiaccessibleretrieval> refp; rv = compmgr->createinstancebycontractid(accretcid, 0, iar_iid_old, getter_addrefs(refp)); if (ns_failed(rv)){ return self; } nscomptr<nsiaccessible> accnode; rv = refp->getaccessiblefor(node, getter_addrefs(accnode)); if(ns_failed(rv)){ return self; } void *wh = null; nscomptr<nsiaccessibledocument> accdocnode; rv = accnode->queryinterface(iad_iid_old, getter_addrefs(accd...
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Control flow and error handling - JavaScript
an if statement looks like this: if (condition) { statement_1; } else { statement_2; } here, the condition can be any expression that evaluates to true or false.
... (see boolean for an explanation of what evaluates to true and false.) if condition evaluates to true, statement_1 is executed.
... you can also compound the statements using else if to have multiple conditions tested in sequence, as follows: if (condition_1) { statement_1; } else if (condition_2) { statement_2; } else if (condition_n) { statement_n; } else { statement_last; } in the case of multiple conditions, only the first logical condition which evaluates to true will be executed.
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Operator precedence - JavaScript
it is interesting to note that, the order of evaluation is always left-to-right irregardless of associativity.
... code output function echo(name, num) { console.log("evaluating the " + name + " side"); return num; } // notice the division operator (/) console.log(echo("left", 6) / echo("right", 2)); evaluating the left side evaluating the right side 3 function echo(name, num) { console.log("evaluating the " + name + " side"); return num; } // notice the exponentiation operator (**) console.log(echo("left", 2) ** echo("right", 3)); evaluating the left side evaluating the right side 8 the difference in associativity comes into play when there are multiple operators of the same precedence.
... code output function echo(name, num) { console.log("evaluating the " + name + " side"); return num; } // notice the division operator (/) console.log(echo("left", 6) / echo("middle", 2) / echo("right", 3)); evaluating the left side evaluating the middle side evaluating the right side 1 function echo(name, num) { console.log("evaluating the " + name + " side"); return num; } // notice the exponentiation operator (**) console.log(echo("left", 2) ** echo("middle", 3) ** echo("ri...
...And 6 more matches
jspage - Archive of obsolete content
rguments")?[b]:b):[];}var $time=date.now||function(){return +new date;};function $try(){for(var b=0,a=arguments.length;b<a; b++){try{return arguments[b]();}catch(c){}}return null;}function $type(a){if(a==undefined){return false;}if(a.$family){return(a.$family.name=="number"&&!isfinite(a))?false:a.$family.name; }if(a.nodename){switch(a.nodetype){case 1:return"element";case 3:return(/\s/).test(a.nodevalue)?"textnode":"whitespace";}}else{if(typeof a.length=="number"){if(a.callee){return"arguments"; }else{if(a.item){return"collection";}}}}return typeof a;}function $unlink(c){var b;switch($type(c)){case"object":b={};for(var e in c){b[e]=$unlink(c[e]); }break;case"hash":b=new hash(c);break;case"array":b=[];for(var d=0,a=c.length;d<a;d++){b[d]=$unlink(c[d]);}break;default:return c;}return b;}var brow...
...ser=$merge({engine:{name:"unknown",version:0},platform:{name:(window.orientation!=undefined)?"ipod":(navigator.platform.match(/mac|win|linux/i)||["other"])[0].tolowercase()},features:{xpath:!!(document.evaluate),air:!!(window.runtime),query:!!(document.queryselector)},plugins:{},engines:{presto:function(){return(!window.opera)?false:((arguments.callee.caller)?960:((document.getelementsbyclassname)?950:925)); },trident:function(){return(!window.activexobject)?false:((window.xmlhttprequest)?((document.queryselectorall)?6:5):4);},webkit:function(){return(navigator.taintenabled)?false:((browser.features.xpath)?((browser.features.query)?525:420):419); },gecko:function(){return(!document.getboxobjectfor&&window.mozinnerscreenx==null)?false:((document.getelementsbyclassname)?19:18);}}},browser||{});b...
...,function(e,d){var c=json.encode(e);if(c){a.push(json.encode(d)+":"+c);}});return"{"+a+"}";case"number":case"boolean":return string(b); case false:return"null";}return null;},decode:function(string,secure){if($type(string)!="string"||!string.length){return null;}if(secure&&!(/^[,:{}\[\]0-9.\-+eaeflnr-u \n\r\t]*$/).test(string.replace(/\\./g,"@").replace(/"[^"\\\n\r]*"/g,""))){return null; }return eval("("+string+")");}});native.implement([hash,array,string,number],{tojson:function(){return json.encode(this);}});var cookie=new class({implements:options,options:{path:false,domain:false,duration:false,secure:false,document:document},initialize:function(b,a){this.key=b; this.setoptions(a);},write:function(b){b=encodeuricomponent(b);if(this.options.domain){b+="; domain="+this.options.domain;}if(thi...
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NPVariant - Archive of obsolete content
syntax typedef struct _npvariant { npvarianttype type; union { bool boolvalue; int32_t intvalue; double_t doublevalue; npstring stringvalue; npobject *objectvalue; } value; } npvariant; fields the data structure has the following fields: type a member of the npvarianttype enumeration specifying the data type contained in the npvariant.
...value() npn_getstringidentifier() npn_getstringidentifiers() npn_getintidentifier() npn_identifierisstring() npn_utf8fromidentifier() npn_intfromidentifier() macros plugin developers are not expected to directly manipulate or access the members of the npvariant instance, instead, the function npn_releasevariantvalue(), and the following macros are provided: npvariant_is_void() evaluates to true if v is of type npvarianttype_void.
... npvariant_is_null() evaluates to true if v is of type npvarianttype_null.
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HTTP Cache
this can only be engaged for resumable responses that (bug 960902) don't need revalidation.
... the consumer then indicates the cache entry needs to be revalidated by returning entry_needs_revalidation from oncacheentrycheck.
... lifetime of an existing entry that doesn't pass server revalidation such a cache entry is first examined in the nsicacheentryopencallback.oncacheentrycheck callback, where the consumer finds out it must be revalidated with the server before use.
...And 5 more matches
Examples
components.utils.import("resource://gre/modules/promise.jsm"); var mypromise = myuserdefinedpromise(); mypromise.then( function(asuccessreason) { alert('mypromise was succesful and reason was = "' + asuccessreason + '"'); }, function(arejectreason) { alert('mypromise failed for reason = "' + uneval(arejectreason) + '"'); } ); function myuserdefinedpromise() { try { //var myvariscommented = 'hi'; // i commented this out s oit is undefined, this will cause rejected alert(myvariscommented); return promise.resolve('yay success'); // this makes the success function trigger with asuccessreason being 'yay success' but because i commented out the var 2 lines above, it will error o...
...variscommented)` with `throw new error('i feel like rejecting this promise')` like this: components.utils.import("resource://gre/modules/promise.jsm"); var mypromise = myuserdefinedpromise(); mypromise.then( function(asuccessreason) { alert('mypromise was succesful and reason was = "' + asuccessreason + '"'); }, function(arejectreason) { alert('mypromise failed for reason = "' + uneval(arejectreason) + '"'); } ); function myuserdefinedpromise() { try { var myvariscommented = 'hi'; alert(myvariscommented); throw new error('i feel like rejecting this promise'); return promise.resolve('yay success'); // this makes the success function trigger with asuccessreason being 'yay success' but because i commented out the var 2 lines above, it will error out on the thr...
... this copy/paste code here will complete succesfully: components.utils.import("resource://gre/modules/promise.jsm"); var mypromise = myuserdefinedpromise(); mypromise.then( function(asuccessreason) { alert('mypromise was succesful and reason was = "' + asuccessreason + '"'); }, function(arejectreason) { alert('mypromise failed for reason = "' + uneval(arejectreason) + '"'); } ); function myuserdefinedpromise() { try { var myvariscommented = 'hi'; alert(myvariscommented); // throw new error('i feel like rejecting this promise'); return promise.resolve('yay success'); // this takes place } catch(ex) { return promise.reject(ex); } } you must return `promise.resolve` in order to make the promise complete successfuly.
...And 5 more matches
Functions
there are four variations that affect how nameexpressions are evaluated.
...when a name is evaluated that doesn't refer to a local variable, the interpreter consults the scope chain to find the variable.
... when with or eval are used, we have to do this for correctness.
...And 5 more matches
Introduction to the JavaScript shell
it is the javascript equivalent of python's interactive prompt, the lisp read-eval-print loop, or ruby's irb.
... evalcx(string[, object]) evaluates the javascript code in string.
... if string is empty and object is not specified, evalcx() returns a new object with eager standard classes.
...And 5 more matches
for - JavaScript
syntax for ([initialization]; [condition]; [final-expression]) statement initialization an expression (including assignment expressions) or variable declaration evaluated once before the loop begins.
... condition an expression to be evaluated before each loop iteration.
... if this expression evaluates to true, statement is executed.
...And 5 more matches
boolean - XPath
xslt/xpath reference: xslt elements, exslt functions, xpath functions, xpath axes the boolean function evaluates an expression and returns true or false.
... syntax boolean( expression ) arguments expression the expression to be evaluated.
... returns boolean true or false after evaluating expression.
...And 5 more matches
Index - XPath
WebXPathIndex
18 boolean xslt, xslt_reference the boolean function evaluates an expression and returns true or false.
... 19 ceiling xslt, xslt_reference the ceiling function evaluates a decimal number and returns the smallest integer greater than or equal to the decimal number.
... 28 floor xslt, xslt_reference the floor function evaluates a decimal number and returns the largest integer less than or equal to the decimal number.
...And 5 more matches
Index - Archive of obsolete content
once the content has been downloaded, the extension authors proceed to use eval() to decode the string content into javascript objects.
... 274 appendix c: avoiding using eval in add-ons no summary!
... 1409 datevalue xul properties, xul reference no summary!
...And 4 more matches
Implementation Status - Archive of obsolete content
processing model (events) section title status notes bugs 4 processing model (events) partial the xforms-recalculate, xforms-revalidate, and xforms-refresh events are not as separated as they should be.
...s-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 supported 4.3.5 xforms-reset supported 4.3.6 xforms-next xforms-previous supported 4.3.7 xforms-focus supported 4.3.8 xforms-help xforms-hint ...
...nd element unsupported 4.8 dom interface for access to instance data supported 4.8.1 getinstancedocument() supported 4.8.2 rebuild() supported 4.8.3 recalculate() supported 4.8.4 revalidate() supported 4.8.5 refresh() supported 4.9 feature string for the hasfeature method call supported 5.
...And 4 more matches
JS::CompileOptions
tattributename(jsstring *p) owningcompileoptions &setintroductionscript(jsscript *s) owningcompileoptions &setmutederrors(bool mute) owningcompileoptions &setversion(jsversion v) owningcompileoptions &setutf8(bool u) owningcompileoptions &setcolumn(unsigned c) owningcompileoptions &setcompileandgo(bool cng) owningcompileoptions &setforeval(bool eval) owningcompileoptions &setnoscriptrval(bool nsr) owningcompileoptions &setselfhostingmode(bool shm) owningcompileoptions &setcanlazilyparse(bool clp) owningcompileoptions &setsourceislazy(bool l) owningcompileoptions &setintroductiontype(const char *t) bool setintroductioninfo(jscontext *cx, const char *introducerfn, const char *intr...
...ect *e) compileoptions &setelementattributename(jsstring *p) compileoptions &setintroductionscript(jsscript *s) compileoptions &setmutederrors(bool mute) compileoptions &setversion(jsversion v) compileoptions &setutf8(bool u) compileoptions &setcolumn(unsigned c) compileoptions &setcompileandgo(bool cng) compileoptions &setforeval(bool eval) compileoptions &setnoscriptrval(bool nsr) compileoptions &setselfhostingmode(bool shm) compileoptions &setcanlazilyparse(bool clp) compileoptions &setsourceislazy(bool l) compileoptions &setintroductiontype(const char *t) compileoptions &setintroductioninfo(const char *introducerfn, const char *intro, unsigned line, jsscript *script...
... compileandgo bool true if the code is going to be evaluated soon after the compile (e.g., false for function constructor and event handler).
...And 4 more matches
The JavaScript input interpreter - Firefox Developer Tools
instant evaluation this feature is available in firefox nightly, in versions labeled 74 and later.
... when the "instant evaluation" feature is enabled, the interpreter displays results of expressions as you're typing them in single-line mode.
...expressions that have side effects are not evaluated.
...And 4 more matches
while - JavaScript
the while statement creates a loop that executes a specified statement as long as the test condition evaluates to true.
... the condition is evaluated before executing the statement.
... syntax while (condition) statement condition an expression evaluated before each pass through the loop.
...And 4 more matches
Security best practices in extensions - Archive of obsolete content
one of the best ways to do this is to use components.utils.evalinsandbox().
...for more information, refer to the evalinsandbox section.
... using eval() in an extension using the built-in javascript eval function is frowned upon in the context of extensions.
...And 3 more matches
JSObject - Archive of obsolete content
(what's the problem with == ?) eval evaluates a javascript expression.
...in javascript 1.3 and earlier versions, you can use either the equals method of java.lang.object or the == operator to evaluate two jsobject objects.
... eval method.
...And 3 more matches
Mozilla's Section 508 Compliance
functional performance criteria requirement windows linux/unix mac os requirement windows linux/unix mac os a) at least one mode of operation and information retrieval that does not require user vision shall be provided, or support for assistive technology used by people who are blind or visually impaired shall be provided.
...gnopernicus support in beta no screen reader support on mac os x b) at least one mode of operation and information retrieval that does not require visual acuity greater than 20/70 shall be provided in audio and enlarged print output working together or independently, or support for assistive technology used by people who are visually impaired shall be provided.
...works with gnome-mag no magnifier support on mac os x c) at least one mode of operation and information retrieval that does not require user hearing shall be provided, or support for assistive technology used by people who are deaf or hard of hearing shall be provided.
...And 3 more matches
Tutorial: Embedding Rhino
in this document: runscript: a simple embedding entering a context initializing standard objects collecting the arguments evaluating a script printing the result exiting the context expose java apis using java apis implementing interfaces adding java objects using javascript objects from java using javascript variables calling javascript functions javascript host objects defining host objects counter example counter's constructors class name dynami...
... string s = ""; for (int i=0; i < args.length; i++) { s += args[i]; } evaluating a script the code object result = cx.evaluatestring(scope, s, "<cmd>", 1, null); uses the context cx to evaluate a string.
... evaluation of the script looks up variables in scope, and errors will be reported with the filename <cmd> and line number 1.
...And 3 more matches
JS::Call
syntax bool js::call(jscontext *cx, js::handleobject thisobj, js::handlefunction fun, const js::handlevaluearray &args, js::mutablehandlevalue rval); bool js::call(jscontext *cx, js::handleobject thisobj, const char *name, const js::handlevaluearray& args, js::mutablehandlevalue rval); bool js::call(jscontext *cx, js::handleobject thisobj, js::handlevalue fun, const js::handlevaluearray& args, js::mutablehandlevalue rval); bool js::call(jscontext *cx, js::handlevalue thisv, js::handlevalue fun, const js::handlevaluearray& args, js::mutablehandlevalue rval); bool js::call(jscontext *cx, js::handlevalue thisv, js::handleobject funobj, const js::han...
...dlevaluearray& args, js::mutablehandlevalue rval); name type description cx jscontext * pointer to a js context from which to derive runtime information.
... thisobj js::handleobject / js::handlevalue the "current" object on which the function operates; the object specified here is "this" when the function executes.
...And 3 more matches
JS::CallArgs
js::mutablehandlevalue operator[](unsigned i) const returns the i-th zero-indexed argument.
... js::handlevalue get(unsigned i) const returns the i-th zero-indexed argument, or undefined if there's no such argument.
... js::handlevalue calleev() const returns the function being called, as a value.
...And 3 more matches
nsIAccessNode
method overview nsiaccessnode getchildnodeat(in long childnum); obsolete since gecko 2.0 nsidomcssprimitivevalue getcomputedstylecssvalue(in domstring pseudoelt, in domstring propertyname); domstring getcomputedstylevalue(in domstring pseudoelt, in domstring propertyname); void scrollto(in unsigned long ascrolltype); void scrolltopoint(in unsigned long acoordinatetype, in long ax, in long ay); attributes note: attempting to access the attributes of a node that is unat...
... getcomputedstylecssvalue() retrieve the computed style value as nsidomcssprimitivevalue for the dom node this access node is associated with.
... nsidomcssprimitivevalue getcomputedstylecssvalue( in domstring pseudoelt, in domstring propertyname ); parameters pseudoelt the pseudo element to retrieve style for, or empty string for general computed style information for the node.
...And 3 more matches
nsIMsgIncomingServer
ko 1.8 void displayofflinemsg(in nsimsgwindow awindow); boolean equals(in nsimsgincomingserver server); void forgetpassword(); void forgetsessionpassword(); astring generateprettynameformigration(); boolean getboolattribute(in string name); boolean getboolvalue(in string attr); acstring getcharattribute(in string name); acstring getcharvalue(in string attr); nsilocalfile getfilevalue(in string relpref, in string abspref); nsimsgfilterlist getfilterlist(in nsimsgwindow amsgwindow); long getintattribute(in string name); long getintvalue(in string attr); nsimsgfolder getmsgfolderfromuri(in nsimsgfolder afolderresource, in acstring auri); void getnewmessages(in nsimsgfolder afolder, in nsimsgwindow amsgwindow, in nsiurllistener aurllistener); acstring getpasswordwi...
...sgwindow amsgwindow); void performexpand(in nsimsgwindow amsgwindow); void removefiles(); void setboolattribute(in string name, in boolean value); void setboolvalue(in string attr, in boolean value); void setcharattribute(in string name, in acstring value); void setcharvalue(in string attr, in acstring value); void setdefaultlocalpath(in nsilocalfile adefaultlocalpath); void setfilevalue(in string relpref, in string abspref, in nsilocalfile avalue); void setfilterlist(in nsimsgfilterlist afilterlist); void setintattribute(in string name, in long value); void setintvalue(in string attr, in long value); void setunicharattribute(in string name, in astring value); void setunicharvalue(in string attr, in astring value); void shutdown(); void storepassword(); astring ...
... downloadonbiff boolean downloadsettings nsimsgdownloadsettings emptytrashonexit boolean filterscope nsmsgsearchscopevalue read only.
...And 3 more matches
nsIMsgSearchSession
erm(in nsimsgsearchterm term); void registerlistener(in nsimsgsearchnotify listener); void unregisterlistener(in nsimsgsearchnotify listener); void getnthsearchterm(in long whichterm, in nsmsgsearchattribvalue attrib, in nsmsgsearchopvalue op, in nsimsgsearchvalue value); long countsearchscopes(); void getnthsearchscope(in long which,out nsmsgsearchscopevalue scopeid, out nsimsgfolder folder); void addscopeterm(in nsmsgsearchscopevalue scope, in nsimsgfolder folder); void adddirectoryscopeterm(in nsmsgsearchscopevalue scope); void clearscopes(); [noscript] boolean scopeusescustomheaders(in nsmsgsearchscopevalue scope, in voidptr selection, in boolean forfilters); boolean isstringattribute(in nsmsgsearcha...
...ttribvalue attrib); void addallscopes(in nsmsgsearchscopevalue attrib); void search(in nsimsgwindow awindow); void interruptsearch(); void pausesearch(); void resumesearch(); [noscript] nsmsgsearchtype setsearchparam(in nsmsgsearchtype type, in voidptr param); [noscript] void addresultelement(in nsmsgresultelement element); boolean matchhdr(in nsimsgdbhdr amsghdr, in nsimsgdatabase adatabase); void addsearchhit(in nsimsgdbhdr header, in nsimsgfolder folder); attributes attribute type description searchterms nsisupportsarray readonly: numsearchterms unsigned long readonly: runningadapter nsimsgsearchadapter readonly: searchparam void...
... countsearchscopes() long countsearchscopes(); getnthsearchscope() void getnthsearchscope(in long which, out nsmsgsearchscopevalue scopeid, out nsimsgfolder folder); parameters which return values scopeid folder addscopeterm() add a scope (e.g.
...And 3 more matches
CSS Typed Object Model API - Web APIs
interfaces cssstylevalue the cssstylevalue interface of the the css typed object model api is the base class of all css values accessible through the typed om api.
... cssstylevalue.parse(property, csstext) the parse() method of the cssstylevalue interface allows a cssnumericvalue to be constructed from a css string.
... it sets a specific css property to the specified values and returns the first value as a cssstylevalue object.
...And 3 more matches
HTTP caching - HTTP
WebHTTPCaching
common forms of caching entries are: successful results of a retrieval request: a 200 (ok) response to a get request containing a resource like html documents, images or files.
... cache-control: no-store cache but revalidate a cache will send the request to the origin server for validation before releasing a cached copy.
... cache-control: max-age=31536000 validation when using the "must-revalidate" directive, the cache must verify the status of the stale resources before using it and expired ones should not be used.
...And 3 more matches
do...while - JavaScript
the do...while statement creates a loop that executes a specified statement until the test condition evaluates to false.
... the condition is evaluated after executing the statement, resulting in the specified statement executing at least once.
... syntax do statement while (condition); statement a statement that is executed at least once and is re-executed each time the condition evaluates to true.
...And 3 more matches
JXON - Archive of obsolete content
onode.nodevalue.trim() : onode.nodevalue; } // nodetype is "text" (3) or "cdatasection" (4) else if (onode.nodetype === 1 && !onode.prefix) { // nodetype is "element" (1) sprop = onode.nodename.tolowercase(); vcontent = new jxontree(onode); if (this.hasownproperty(sprop)) { if (this[sprop].constructor !== array) { this[sprop] = [this[sprop]]; } this[sprop].push...
...onode.nodevalue.trim() : onode.nodevalue; } else if (onode.nodetype === 1 && !onode.prefix) { sprop = onode.nodename.tolowercase(); vcontent = new jxontree(onode); if (this.hasownproperty(sprop)) { if (this[sprop].constructor !== array) { this[sprop] = [this[sprop]]; } this[sprop].push(vcontent); } else { this[sprop] = vcontent; } } } if (...
...length++) { oattrib = oxmlparent.attributes.item(nlength); vresult["@" + oattrib.name.tolowercase()] = parsetext(oattrib.value.trim()); } } if (oxmlparent.haschildnodes()) { for (var onode, sprop, vcontent, nitem = 0; nitem < oxmlparent.childnodes.length; nitem++) { onode = oxmlparent.childnodes.item(nitem); if (onode.nodetype === 4) { scollectedtxt += onode.nodevalue; } /* nodetype is "cdatasection" (4) */ else if (onode.nodetype === 3) { scollectedtxt += onode.nodevalue.trim(); } /* nodetype is "text" (3) */ else if (onode.nodetype === 1 && !onode.prefix) { /* nodetype is "element" (1) */ if (nlength === 0) { vresult = {}; } sprop = onode.nodename.tolowercase(); vcontent = getjxontree(onode); if (vresult.hasownpr...
...And 2 more matches
Introduction to Public-Key Cryptography - Archive of obsolete content
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.
...the server then continues to evaluate whether the identified user is permitted to access the requested resource.
... this evaluation process can employ a variety of standard authorization mechanisms, potentially using additional information in an ldap directory, company databases, and so on.
...And 2 more matches
Making decisions in your code — conditionals - Learn web development
when used in conditions, the first two do the following: && — and; allows you to chain together two or more expressions so that all of them have to individually evaluate to true for the whole expression to return true.
... || — or; allows you to chain together two or more expressions so that one or more of them have to individually evaluate to true for the whole expression to return true.
...for example: if (x === 5 || 7 || 10 || 20) { // run my code } in this case the condition inside if(...) will always evaluate to true since 7 (or any other non-zero value) always evaluates to true.
...And 2 more matches
Dynamic behavior in Svelte: working with variables and props - Learn web development
behind the scenes the svelte compiler will parse and analyze our code to make a dependency tree, then it will generate the javascript code to re-evaluate each reactive statement whenever one of their dependencies is updated.
...so whenever either of them is modified, this code is re-evaluated, updating newtodoid accordingly.
...if the value expression evaluates to truthy, the class name will be applied.
...And 2 more matches
Localization sign-off reviews
only evaluates new l10n work.
... evaluates new release revisions, not entire l10n repos.
... sign-off review criteria since the scope of each qa review process varies, the criteria used to evaluate a localizer's work also varies.
...And 2 more matches
L20n Javascript API
a 404 error when fetching a resource file, or recursive import statements in resource files), context.translationerror, when there is a missing translation in one of supported locales; the context instance will try to retrieve a fallback translation from the next locale in the fallback chain, compiler.error, when l20n is unable to evaluate an entity to a string; there are two types of errors in this category: compiler.valueerror, when l20n can still try to use the literal source string of the entity as fallback, and compiler.indexerror otherwise.
... if passed, ctxdata is a simple hash object with a list of variables that extend the context data available for the evaluation of this entity.
... ctx.getentitysync(id: string, ctxdata: object?) retrieve an object with data evaluated from an entity called id.
...And 2 more matches
Introduction to NSPR
this requirement implies that when a thread first enters the monitor, an evaluation of the invariant expression must yield a true.
...therefore, evaluation of the expression must also yield a true at that point in execution.
... note: evaluation of the invariant expression is a conceptual requirement and is rarely done in practice.
...And 2 more matches
How to embed the JavaScript engine
s_newglobalobject(cx, &global_class, nullptr)); if (!global) return 1; js::rootedvalue rval(cx); { // scope for jsautocompartment jsautocompartment ac(cx, global); js_initstandardclasses(cx, global); const char *script = "'hello'+'world, it is '+new date()"; const char *filename = "noname"; int lineno = 1; bool ok = js_evaluatescript(cx, global, script, strlen(script), filename, lineno, rval.address()); if (!ok) return 1; } jsstring *str = rval.tostring(); printf("%s\n", js_encodestring(cx, str)); } js_destroycontext(cx); js_destroyruntime(rt); js_shutdown(); return 0; } spidermonkey 31 // following code might be needed in some case // #define __stdc_limit...
...obal_class, nullptr, js::fireonnewglobalhook)); if (!global) return 1; js::rootedvalue rval(cx); { // scope for jsautocompartment jsautocompartment ac(cx, global); js_initstandardclasses(cx, global); const char *script = "'hello'+'world, it is '+new date()"; const char *filename = "noname"; int lineno = 1; bool ok = js_evaluatescript(cx, global, script, strlen(script), filename, lineno, &rval); if (!ok) return 1; } jsstring *str = rval.tostring(); printf("%s\n", js_encodestring(cx, str)); } js_destroycontext(cx); js_destroyruntime(rt); js_shutdown(); return 0; } spidermonkey 38 // following code might be needed in some case // #define __stdc_limit_macros /...
...; js::rootedvalue rval(cx); { // scope for jsautocompartment jsautocompartment ac(cx, global); js_initstandardclasses(cx, global); const char *script = "'hello'+'world, it is '+new date()"; const char *filename = "noname"; int lineno = 1; js::compileoptions opts(cx); opts.setfileandline(filename, lineno); bool ok = js::evaluate(cx, global, opts, script, strlen(script), &rval); if (!ok) return 1; } jsstring *str = rval.tostring(); printf("%s\n", js_encodestring(cx, str)); } js_destroycontext(cx); js_destroyruntime(rt); js_shutdown(); return 0; } spidermonkey 45 // following code might be needed in some case // #define __stdc_limit_macros // #include <stdint...
...And 2 more matches
Web Replay
devtools.recordreplay.fastlogpoints when enabled, firefox web replay evaluates logpoints consecutively.
... these operations may be property accesses, evals, or object calls, and an example is accessing the font property of a canvasrenderingcontext2d.
... operations on the debuggee which have side effects — eval("x.f = 3") — should be avoided.
...And 2 more matches
Components.utils.Sandbox
components.utils.sandbox is used to create a sandbox object for use with evalinsandbox().
...you can then use it with evalinsandbox() to make it the global scope object for the specified script.
... wantexporthelpers a boolean: if true, then createobjectin(), evalinwindow(), and exportfunction() are available in the sandbox.
...And 2 more matches
jsdIStackFrame
makes eval() use the last object on its 'obj' param's scope chain as the ecma 'variables object'.
...method overview boolean eval(in astring bytes, in autf8string filename, in unsigned long line, out jsdivalue result); attributes attribute type description callee jsdivalue function object running in this stack frame.
... isdebugger boolean true if stack frame represents a frame created as a result of a debugger evaluation.
...And 2 more matches
nsIJetpack
*/); void registerreceiver(in astring amessagename, in jsval areceiver); void unregisterreceiver(in astring amessagename, in jsval areceiver); void unregisterreceivers(in astring amessagename); void evalscript(in astring ascript); nsivariant createhandle(); void destroy(); methods sendmessage() this method asynchronously sends a message to the jetpack process.
... evalscript() this asynchronously sends code to the jetpack process for evaluation.
... the code will be evaluated using at least javascript 1.8.1.
...And 2 more matches
XPCOM Interface Reference
component; nsiprefbranchextensionmanager (toolkit)iaccessible2iaccessibleactioniaccessibleapplicationiaccessiblecomponentiaccessibleeditabletextiaccessiblehyperlinkiaccessiblehypertextiaccessibleimageiaccessiblerelationiaccessibletableiaccessibletable2iaccessibletablecelliaccessibletextiaccessiblevalueidispatchijsdebuggeramiinstallcallbackamiinstalltriggeramiwebinstallinfoamiwebinstalllisteneramiwebinstallpromptamiwebinstallerimgicacheimgicontainerimgicontainerobserverimgidecoderimgidecoderobserverimgiencoderimgiloaderimgirequestinidomutilsjsdistackframemoziasyncfaviconsmoziasynchistorymozicoloranalyzermozijssubscriptloadermozipersonaldictionarymoziplaceinfomoziplacesautocompletemoziregistrymozirepresentativ...
...toragebindingparamsmozistoragebindingparamsarraymozistoragecompletioncallbackmozistorageconnectionmozistorageerrormozistoragefunctionmozistoragependingstatementmozistorageprogresshandlermozistorageresultsetmozistoragerowmozistorageservicemozistoragestatementmozistoragestatementcallbackmozistoragestatementparamsmozistoragestatementrowmozistoragestatementwrappermozistoragevacuumparticipantmozistoragevaluearraymozitxttohtmlconvmozithirdpartyutilmozivisitinfomozivisitinfocallbackmozivisitstatuscallbacknsiabcardnsiaboutmodulensiabstractworkernsiaccelerometerupdatensiaccessnodensiaccessibilityservicensiaccessiblensiaccessiblecaretmoveeventnsiaccessiblecoordinatetypensiaccessibledocumentnsiaccessibleeditabletextnsiaccessibleeventnsiaccessiblehyperlinknsiaccessiblehypertextnsiaccessibleimagensiaccessi...
...bleprovidernsiaccessiblerelationnsiaccessibleretrievalnsiaccessiblerolensiaccessiblescrolltypensiaccessibleselectablensiaccessiblestatechangeeventnsiaccessiblestatesnsiaccessibletablensiaccessibletablecellnsiaccessibletablechangeeventnsiaccessibletextnsiaccessibletextchangeeventnsiaccessibletreecachensiaccessiblevaluensiaccessiblewin32objectnsialertsservicensiannotationobservernsiannotationservicensiappshellnsiappshellservicensiappstartupnsiappstartup_mozilla_2_0nsiapplicationcachensiapplicationcachechannelnsiapplicationcachecontainernsiapplicationcachenamespacensiapplicationcacheservicensiapplicationupdateservicensiarraynsiasyncinputstreamnsiasyncoutputstreamnsiasyncstreamcopiernsiasyncverifyredirectcallbacknsiauthinformationnsiauthmodulensiauthpromptnsiauthprompt2nsiauthpromptadapterfactoryn...
...And 2 more matches
WebIDL bindings
so for example, given this idl: interface myinterface { [pure, storeinslot] attribute long myattribute; }; the c++ implementation of myinterface would clear the cached value by calling mozilla::dom::myinterface_binding::clearcachedmyattributevalue(cx, this).
... so for example, given this idl: interface myinterface { [pure, storeinslot] attribute long myattribute; }; the c++ implementation of myinterface would clear the cached value by calling mozilla::dom::myinterface_binding::clearcachedmyattributevalue(this).
... js-implemented webidl can clear the cached value by calling this.__dom_impl__._clearcachedmyattributevalue().
...And 2 more matches
Debugger.Script - Firefox Developer Tools
the code passed to a single call to eval, excluding the bodies of any functions that code defines.
... note that spidermonkey may use the same debugger.script instances for equivalent functions or evaluated code—that is, scripts representing the same source code, at the same position in the same source file, evaluated in the same lexical environment.
... currently only entire modules evaluated via new webassembly.module are represented.
...And 2 more matches
Basic animations - Web APIs
assname("keypress")[0].classlist.toggle("hide") } var t = new date + "", d = void 0, cc = document.getelementsbytagname("canvas")[0], c = cc.getcontext("2d"); key = {}, key.keydown = function (t) { var e = document.createevent("keyboardevent"); object.defineproperty(e, "keycode", { get: function () { return this.keycodeval } }), object.defineproperty(e, "key", { get: function () { return 37 == this.keycodeval ?
... "arrowleft" : 38 == this.keycodeval ?
... "arrowup" : 39 == this.keycodeval ?
...And 2 more matches
WindowOrWorkerGlobalScope.setTimeout() - Web APIs
this syntax is not recommended for the same reasons that make using eval() a security risk.
...owser, including ie 9 and below, you can either use javascript conditional comments: /*@cc_on // conditional ie < 9 only fix @if (@_jscript_version <= 9) (function(f){ window.settimeout = f(window.settimeout); window.setinterval = f(window.setinterval); })(function(f){return function(c,t){var a=[].slice.call(arguments,2);return f(function(){c instanceof function?c.apply(this,a):eval(c)},t)}}); @end @*/ ...
... or go for a very clean approach based on the ie html conditional feature: <!--[if lte ie 9]><script> (function(f){ window.settimeout=f(window.settimeout); window.setinterval=f(window.setinterval); })(function(f){return function(c,t){ var a=[].slice.call(arguments,2);return f(function(){c instanceof function?c.apply(this,a):eval(c)},t)} }); </script><![endif]--> workarounds another possibility is to use an anonymous function to call your callback, but this solution is a bit more expensive.
...And 2 more matches
Linear-gradient Generator - CSS: Cascading Style Sheets
'hsl' : 'hsv'; this.color.setformat(this.picker_mode); this.createpickingarea(); this.createhuearea(); this.newinputcomponent('h', 'hue', this.inputchangehue.bind(this)); this.newinputcomponent('s', 'saturation', this.inputchangesaturation.bind(this)); this.newinputcomponent('v', 'value', this.inputchangevalue.bind(this)); this.newinputcomponent('l', 'lightness', this.inputchangelightness.bind(this)); this.createalphaarea(); this.newinputcomponent('r', 'red', this.inputchangered.bind(this)); this.newinputcomponent('g', 'green', this.inputchangegreen.bind(this)); this.newinputcomponent('b', 'blue', this.inputchangeblue.bind(this)); this.createpreviewbox(); this.createchangemodebutton(...
...pe.inputchangehue = function inputchangehue(e) { var value = parseint(e.target.value); this.sethue(value); this.updatehuepicker(); }; colorpicker.prototype.inputchangesaturation = function inputchangesaturation(e) { var value = parseint(e.target.value); this.color.setsaturation(value); e.target.value = this.color.saturation; this.updateslv(); }; colorpicker.prototype.inputchangevalue = function inputchangevalue(e) { var value = parseint(e.target.value); this.color.setvalue(value); e.target.value = this.color.value; this.updateslv(); }; colorpicker.prototype.inputchangelightness = function inputchangelightness(e) { var value = parseint(e.target.value); this.color.setlightness(value); e.target.value = this.color.lightness; this.updateslv(); }; colorpicke...
...'; while (node.firstelementchild !== null) { option = node.firstelementchild; option_value = option.getattribute('data-value'); if (option_value === null) option.setattribute('data-value', uval); list.appendchild(node.firstelementchild); uval++; } node.appendchild(select); node.appendchild(list); select.onclick = this.toggle.bind(this); list.onclick = this.updatevalue.bind(this); document.addeventlistener('click', clickout); this.state = 0; this.time = 0; this.dropmenu = list; this.select = select; this.toggle(false); this.value = {}; this.topic = topic; if (label) select.textcontent = label; else this.setnodevalue(list.children[selected]); dropdowns[topic] = this; }; dropdown.prototype.toggle = function toggle(state) { i...
...And 2 more matches
<script>: The Script element - HTML: Hypertext Markup Language
WebHTMLElementscript
asynchtml5 for classic scripts, if the async attribute is present, then the classic script will be fetched in parallel to parsing and evaluated as soon as it is available.
... for module scripts, if the async attribute is present then the scripts and all their dependencies will be executed in the defer queue, therefore they will get fetched in parallel to parsing and evaluated as soon as they are available.
... this attribute allows the elimination of parser-blocking javascript where the browser would have to load and evaluate scripts before continuing to parse.
...And 2 more matches
Loops and iteration - JavaScript
the statements for loops provided in javascript are: for statement do...while statement while statement labeled statement break statement continue statement for...in statement for...of statement for statement a for loop repeats until a specified condition evaluates to false.
... the conditionexpression expression is evaluated.
...ct.options.length; i++) { if (selectobject.options[i].selected) { numberselected++; } } return numberselected; } let btn = document.getelementbyid('btn'); btn.addeventlistener('click', function() { alert('number of options selected: ' + howmany(document.selectform.musictypes)); }); </script> do...while statement the do...while statement repeats until a specified condition evaluates to false.
...And 2 more matches
Error.prototype.stack - JavaScript
while an object (or array, etc.) would appear in the converted form "[object object]", and as such could not be evaluated back into the actual objects, scalar values could be retrieved (though it may be — it is still possible in firefox 14 — easier to use arguments.callee.caller.arguments, as could the function name be retrieved by arguments.callee.caller.name).
...9: trace@file:///c:/example.html:9 b@file:///c:/example.html:16 a@file:///c:/example.html:19 @file:///c:/example.html:21 firefox 13 and earlier would instead produce the following text: error("myerror")@:0 trace()@file:///c:/example.html:9 b(3,4,"\n\n",(void 0),[object object])@file:///c:/example.html:16 a("first call, firstarg")@file:///c:/example.html:19 @file:///c:/example.html:21 stack of eval'ed code starting with firefox 30, the error stack of code in function() and eval() calls, now produces stacks with more detailed information about the line and column numbers inside these calls.
... function calls are indicated with "> function" and eval calls with "> eval".
...And 2 more matches
Nullish coalescing operator (??) - JavaScript
lc); // 42 assigning a default value to a variable earlier, when one wanted to assign a default value to a variable, a common pattern was to use the logical or operator (||): let foo; // foo is never assigned any value so it is still undefined let somedummytext = foo || 'hello!'; however, due to || being a boolean logical operator, the left hand-side operand was coerced to a boolean for the evaluation and any falsy value (0, '', nan, null, undefined) was not returned.
... let count = 0; let text = ""; let qty = count || 42; let message = text || "hi!"; console.log(qty); // 42 and not 0 console.log(message); // "hi!" and not "" the nullish coalescing operator avoids this pitfall by only returning the second operand when the first one evaluates to either null or undefined (but no other falsy values): let mytext = ''; // an empty string (which is also a falsy value) let notfalsytext = mytext || 'hello world'; console.log(notfalsytext); // hello world let preservingfalsy = mytext ??
... 'hi neighborhood'; console.log(preservingfalsy); // '' (as mytext is neither undefined nor null) short-circuiting like the or and and logical operators, the right-hand side expression is not evaluated if the left-hand side proves to be neither null nor undefined.
...And 2 more matches
Statements and declarations - JavaScript
switch evaluates an expression, matching the expression's value to a case clause, and executes statements associated with that case.
... iterations do...while creates a loop that executes a specified statement until the test condition evaluates to false.
... the condition is evaluated after executing the statement, resulting in the specified statement executing at least once.
...And 2 more matches
Transitioning to strict mode - JavaScript
differences from non-strict to strict syntax errors when adding 'use strict';, the following cases will throw a syntaxerror before the script is executing: octal syntax var n = 023; with statement using delete on a variable name delete myvariable; using eval or arguments as variable or function argument name using one of the newly reserved keywords (in prevision for ecmascript 2015): implements, interface, let, package, private, protected, public, static, and yield declaring function in blocks if (a < b) { function f() {} } obvious errors declaring twice the same name for a property name in an object literal {a: 1, b: 3, a: 7} this is no lon...
... change to eval in strict mode code, eval doesn't create a new variable in the scope from which it was called.
... also, of course, in strict mode, the string is evaluated with strict mode rules.
...And 2 more matches
Modules - Archive of obsolete content
however, the following example shows how it can be used to load scripts from other locations: const { classes: cc interfaces: ci } = components; var instance = cc["@mozilla.org/moz/jssubscript-loader;1"]; var loader = instance.getservice(ci.mozijssubscriptloader); function loadscript(url) { loader.loadsubscript(url); } when a script is loaded, it is evaluated in the scope of the global object of the script that loaded it.
...a more serious problem with the loadscript function, however, is that it evaluates all scripts in the scope of the same global object.
...to prevent scripts from interfering with each other, loadscript should evaluate each script to be loaded in the scope of their own global object, and then return the global object as its result.
...the script loader we obtained from components allows us to do just that: function loadscript(url) { let global = {}; loader.loadsubscript(url, global); return global; } if present, the loadsubscript function evaluates the script to be loaded in the scope of the second argument.
Finding window handles - Archive of obsolete content
per.gnome.org/gdk2/stable/gdk2-x-window-system-interaction.html#gdk-x11-get-server-time var gdk_x11_get_server_time = gdk.declare('gdk_x11_get_server_time', ctypes.default_abi, guint32, gdkwindow.ptr); var browserwindow_madeintogdkwinptr = gdkwindow.ptr(ctypes.uint64(gdkwindowptrstring)); var rez_gst = gdk_x11_get_server_time(browserwindow_madeintogdkwinptr); console.info('rez_gst:', rez_gst, uneval(rez_gst)); // return is a number of ms since the computer (xserver) was on var rez_gwf = gdk_window_focus(browserwindow_madeintogdkwinptr, rez_gst); console.info('rez_gwf:', rez_gwf, uneval(rez_gwf)); // return is void so this will be undefined gdk.close(); gtk+ components.utils.import('resource://gre/modules/services.jsm'); var browserwindow = services.wm.getmostrecentwindow('navigator:brow...
...get-server-time var gdk_x11_get_server_time = gdk.declare('gdk_x11_get_server_time', ctypes.default_abi, guint32, gdkwindow.ptr); var browserwindow_madeintogdkwinptr = gdkwindow.ptr(ctypes.uint64(gdkwindowptrstring)); var gptr = gpointer(); var rez_gwgud = gdk_window_get_user_data(browserwindow_madeintogdkwinptr, gptr.address()); console.info('rez_gwgud:', rez_gwgud, /*rez_gwgud.tostring(),*/ uneval(rez_gwgud)); // return is void so cant do .tostring on it var browserwindow_madeintogtkwindowptr = ctypes.cast(gptr, gtkwindow.ptr); // focusing window this way is better, so it maintains proper history in case you or some other app want to focus "most recent window" by timestamp // var rez_gst = gdk_x11_get_server_time(browserwindow_madeintogdkwinptr); // console.info('rez_gst:', rez_gst, unev...
...al(rez_gst)); // return is a number of ms since the computer (xserver) was on // var rez_gwpwt = gtk_window_present_with_time(browserwindow_madeintogtkwindowptr, rez_gst); // console.info('rez_gwaf:', rez_gwpwt, uneval(rez_gwpwt)); var rez_gwp = gtk_window_present(browserwindow_madeintogtkwindowptr); console.info('rez_gwaf:', rez_gwaf, uneval(rez_gwaf)); gdk.close(); gtk.close(); x11 warning this example below does not focus a window yet, it does convert from a gdkwindow* to a xid and that's it, the code for focusing the window is soon to come.
...); var browserwindow_madeintogdkwinptr = gdkwindow.ptr(ctypes.uint64(gdkwindowptrstring)); var browserwindow_madeintogdkdrawable = ctypes.cast(browserwindow_madeintogdkwinptr, gdkdrawable.ptr); var browserwindow_madeintoxid = gdk_x11_drawable_get_xid(browserwindow_madeintogdkdrawable); console.info('browserwindow_madeintoxid:', browserwindow_madeintoxid, browserwindow_madeintoxid.tostring(), uneval(browserwindow_madeintoxid)); // the code to focus the window is soon to come, its long and messy it needs to be made into a simple readable good for example.
Downloading JSON and JavaScript in extensions - Archive of obsolete content
once the content has been downloaded, the extension authors proceed to use eval() to decode the string content into javascript objects.
... downloading json if the extension is downloading json, then the developer should be using one of the json decoding methods discussed here and not using eval() at all.
...use the json decoders, not eval()!
... sandboxing is done using components.utils.evalinsandbox().
Migrate apps from Internet Explorer to Mozilla - Archive of obsolete content
entity reference node 6 entity node 7 processing instruction node 8 comment node 9 document node 10 document type node 11 document fragment node 12 notation node nodevalue returns the value of the current node.
... the console also allows you to evaluate javascript.
... to evaluate the entered javascript syntax, type in 1+1 into the input field and press evaluate, as figure 2 shows.
...javascript console evaluating mozilla's javascript engine has built-in support for debugging, and thus can provide powerful tools for javascript developers.
Additional Navigation - Archive of obsolete content
the others won't be able to match when evaluating the triple.
... to look closer, here is the data network after only the member has been evaluated: (?start = http://www.xulplanet.com/rdf/myphotos, ?photo = http://www.xulplanet.com/ndeakin/images/t/palace.jpg) (?start = http://www.xulplanet.com/rdf/myphotos, ?photo = http://www.xulplanet.com/ndeakin/images/t/canal.jpg) (?start = http://www.xulplanet.com/rdf/myphotos, ?photo = http://www.xulplanet.com/ndeakin/images/t/obselisk.jpg) when evaluating the triple, the template builder will iterate over the three potential results found so far.
... <query> <content uri="?start"/> <triple subject="?relateditem" predicate="http://www.xulplanet.com/rdf/relateditem" object="?start"/> </query> the triple is evaluated in the same manner except that the value of the object can be filled in with the value of the ?start variable.
...the template builder doesn't know this either until the triple is evaluated and variable substitution is done.
How to build custom form controls - Learn web development
// it takes two parameters: // select : the dom node with the class `select` containing the value to update // index : the index of the value to be selected function updatevalue(select, index) { // we need to get the native control for the given custom control // in our example, that native control is a sibling of the custom control var nativewidget = select.previouselementsibling; // we also need to get the value placeholder of our custom control var value = select.queryselector('.value'); // and we need the whole list of options var optionlist = sele...
... selectlist.foreach(function (select) { var optionlist = select.queryselectorall('.option'), selectedindex = getindex(select); // we make our custom control focusable select.tabindex = 0; // we make the native control no longer focusable select.previouselementsibling.tabindex = -1; // we make sure that the default selected value is correctly displayed updatevalue(select, selectedindex); // each time a user clicks on an option, we update the value accordingly optionlist.foreach(function (option, index) { option.addeventlistener('click', function (event) { updatevalue(select, index); }); }); // each time a user uses their keyboard on a focused control, we update the value accordingly select.addeventlistener('keyup...
...', function (event) { var length = optionlist.length, index = getindex(select); // when the user hits the down arrow, we jump to the next option if (event.keycode === 40 && index < length - 1) { index++; } // when the user hits the up arrow, we jump to the previous option if (event.keycode === 38 && index > 0) { index--; } updatevalue(select, index); }); }); }); in the code above, it's worth noting the use of the tabindex property.
...to that end, we need to revise our updatevalue() function: function updatevalue(select, index) { var nativewidget = select.previouselementsibling; var value = select.queryselector('.value'); var optionlist = select.queryselectorall('[role="option"]'); // we make sure that all the options are not selected optionlist.foreach(function (other) { other.setattribute('aria-selected', 'false'); }); // we make sure the chosen op...
How to implement a custom autocomplete search component
* @return {string} the final value of the result at the given index */ getfinalcompletevalueat: function(index) { return this.getvalueat(index); }, /** * removes the value at the given index from the autocomplete results.
... */ removevalueat: function(index, removefromdb) { this._results.splice(index, 1); if (this._comments) this._comments.splice(index, 1); }, getlabelat: function(index) { return this._results[index]; }, queryinterface: xpcomutils.generateqi([ ci.nsiautocompleteresult ]) }; /** * @constructor * * @implements {nsiautocompletesearch} */ function providerautocompletesearch() { } providerautocompletesearch.prototype = { classid: class_id, classdescription : class_name, contractid : contract_id, /** * searches for a given string and notifies a listener (either synchronously * or asynchronously) of the result * * @param searchstring the string t...
... * @return {string} the final value of the result at the given index */ getfinalcompletevalueat: function(index) { return this.getvalueat(index); }, /** * remove the value at the given index from the autocomplete results.
... */ removevalueat: function(index, removefromdb) { this._results.splice(index, 1); this._comments.splice(index, 1); }, queryinterface: function(aiid) { if (!aiid.equals(ci.nsiautocompleteresult) && !aiid.equals(ci.nsisupports)) throw components.results.ns_error_no_interface; return this; } }; // implements nsiautocompletesearch function simpleautocompletesearch() { } simpleautocompletesearch.prototype = { /* * search for a given string and notify a listener (either synchronously * or asynchronously) of the result * * @param searchstring - the string to search for * @param searchparam - an extra parameter * @param previousresult - a pr...
PR_Wait
it is the responsibility of the programmer to evaluate the data and act accordingly.
... this is usually done by evaluating a boolean expression involving the monitored data.
...the boolean expression must be evaluated while in the monitor and within a loop.
... resuming from the wait is merely an opportunity to evaluate the expression, not an assertion that the expression is true.
sslfnc.html
(the value is normally pr_true.) isserver pr_true means the callback function should evaluate the certificate as a server does, treating the remote end as a client.
... pr_false means the callback function should evaluate the certificate as a client does, treating the remote end as a server.
...(the value is normally pr_true.) isserver pr_true means the callback function should evaluate the certificate as a server does, treating the remote end is a client.
... pr_false means the callback function should evaluate the certificate as a client does, treating the remote end as a server.
Rhino Debugger
the rhino javascript debugger can debug scripts running in multiple threads and provides facilities to set and clear breakpoints, control execution, view variables, and evaluate arbitrary javascript code in the current scope of an executing script.
...the expressions you enter are re-evaluated in the current scope and their current values displayed each time control returns to the debugger or when you change the stack location in the context: window.
... evaluation window the evaluate pane located in the lower-right (dockable) pane in the debugger main window contains an editable command line where you may enter arbitrary javascript code.
... the code is evaluated in the context of the current stack frame.
GC Rooting Guide
similarly to js::rooted<t>, there are typedefs available for the main types: template class typedef js::handle<js::value> js::handlevalue js::handle<jsobject*> js::handleobject js::handle<jsstring*> js::handlestring js::handle<jsscript*> js::handlescript js::handle<jsid> js::handleid you should use js::handle<t> for all function parameters taking gc thing pointers (except out-parameters, which are described below).
... there are typedefs for js::mutablehandle<t>, the same as for the other templates: template class typedef js::mutablehandle<js::value> js::mutablehandlevalue js::mutablehandle<jsobject*> js::mutablehandleobject js::mutablehandle<jsstring*> js::mutablehandlestring js::mutablehandle<jsscript*> js::mutablehandlescript js::mutablehandle<jsid> js::mutablehandleid js::mutablehandle<t> should be used for all out-parameters, for example instead of: bool maybegetvalue(jscontext *cx, js::value* valueout)...
...} you should write: bool maybegetvalue(jscontext *cx, js::mutablehandlevalue valueout) { // ...
... for example, instead of this: struct heapstruct { jsobject* msomeobject; js::value msomevalue; }; you should write: struct heapstruct { js::heap<jsobject*> msomeobject; js::heap<js::value> msomevalue; }; tracing js::nativeobject all gc pointers stored on the heap must be traced.
Hacking Tips
x=0x14f2640, native=0xf89960 , args=...) at js/src/jscntxtinlines.h:235 #2 0x0000000000c87625 in js::invoke(jscontext*, js::callargs const&, js::maybeconstruct) (cx=0x14f2640, args=..., construct=js::no_construct) at js/src/vm/interpreter.cpp:476 #3 0x000000000069bdcf in js::jit::docallfallback(jscontext*, js::jit::baselineframe*, js::jit::iccall_fallback*, uint32_t, js::value*, js::mutablehandlevalue) (cx=0x14f2640, frame=0x7fffffff6ad8, stub_=0x1798838, argc=1, vp=0x7fffffff6a88, res=jsval_void) at js/src/jit/baselineic.cpp:6113 #4 0x00007ffff7f41395 in <<jitframe_exit>> () #5 0x00007ffff7f42223 in <<jitframe_baselinestub>> () #6 0x00007ffff7f4423d in <<jitframe_baselinejs>> () #7 0x00007ffff7f4222e in <<jitframe_baselinestub>> () #8 0x00007ffff7f4326a in <<jitframe_baselinejs>> () #9...
... since there isn't debug info for the jitted code, you will need to tell gdb that you are looking at arm code: (gdb) set arm force-mode arm or you can wrap the x command in your own command: def xi set arm force-mode arm eval "x/%di %d", $arg0, $arg1 set arm force-mode auto end printing asm.js/wasm generated assembly code (from gdb) set a breakpoint on js::wasm::instance::callexport (defined in wasminstance.cpp as of november 18th 2016).
... these benchmarks are publicly recognized benchmarks suggested by other companies and are used as a metric to evaluate how fast javascript engines.
... benchmarking with sub-milliseconds (js shell) in the shell we have 2 simple ways to benchmark a script, we can either use the -b shell option (--print-timing) which will evaluate a script given on the command line without any need to instrument the benchmark and print an extra line showing the run-time of the script.
SpiderMonkey Internals
there are a few special values: nullvalue(), undefinedvalue(), truevalue() and falsevalue().
... var sumofdivisors = new exprarray(n + 1, 1); for (var divisor = 2; divisor <= n; divisor++) { for (var j = divisor + divisor; j <= n; j += divisor) { sumofdivisors[j] += " + " + divisor; } // at this point everything up to 'divisor' has its sumofdivisors // expression calculated, so we can determine whether it's perfect // already by evaluating.
... if (eval(sumofdivisors[divisor]) == divisor) { print("" + divisor + " = " + sumofdivisors[divisor]); } } delete sumofdivisors; print("that's all."); } the line number to pc and back mappings can be tested using the js program with the following script: load("perfect.js"); print(perfect); dis(perfect); print(); for (var ln = 0; ln <= 40; ln++) { var pc = line2pc(perfect, ln); var ln2 = pc2line(perfect, pc); print("\tline " + ln + " => pc " + pc + " => line " + ln2); } the result of the for loop over lines 0 to 40 inclusive is: line 0 => pc 0 => line 16 line 1 => pc 0 => line 16 line 2 => pc 0 => line 16 line 3 => pc 0 => line 16 line 4 => pc 0 => line 16 line 5 => pc 0 => line 16 line 6 => pc 0 => line 16 line 7 => pc 0 => line 16 line 8 => pc 0 => line 16 ...
...the js program built from this source provides a test vehicle for evaluating scripts and calling functions, trying out new debugger primitives, etc.
JIT Optimization Strategies
the function containing the arguments.length is allowed to use the arguments object in the following ways without disabling this optimization: access arguments.length access arguments.callee access individual args using arguments[i] save arguments into variables, as long as those variables cannot be accessed by any nested function, and as long as there exists no eval anywhere within the function or nested function definitions.
...the function containing the arguments.callee is allowed to use the arguments object in the following ways without disabling this optimization: access arguments.length access arguments.callee access individual args using arguments[i] save arguments into variables, as long as those variables cannot be accessed by any nested function, and as long as there exists no eval anywhere within the function or nested function definitions.
...the function containing the arguments.length is allowed to use the arguments object in the following ways without disabling this optimization: access arguments.length access arguments.callee access individual args using arguments[i] save arguments into variables, as long as those variables cannot be accessed by any nested function, and as long as there exists no eval anywhere within the function or nested function definitions.
...the function containing the arguments.length is allowed to use the arguments object in the following ways without disabling this optimization: access arguments.length access arguments.callee access individual args using arguments[i] save arguments into variables, as long as those variables cannot be accessed by any nested function, and as long as there exists no eval anywhere within the function or nested function definitions.
JS::AutoValueArray
this is typically used for local variables being passed to function which requires js::handlevaluearray or a pointer to js::value array.
...*/ somefunction1(cx, 2, args.begin()); pass to function as js::handlevaluearray.
... bool somefunction2(jscontext *cx, const js::handlevaluearray &args) { /* ...
...*/ somefunction2(cx, args); see also mxr id search for js::autovaluearray js::value js::handlevaluearray bug 965830 ...
JS::Construct
syntax bool js::construct(jscontext *cx, js::handlevalue fun, const js::handlevaluearray& args, js::mutablehandlevalue rval); name type description cx jscontext * pointer to a js context from which to derive runtime information.
... fun js::handlevalue pointer to the function to call.
... args js::handlevaluearray &amp; arguments you are passing to the function.
... rval js::mutablehandlevalue out parameter.
JS_CallFunction
syntax /* added in spidermonkey 31 */ bool js_callfunction(jscontext *cx, js::handleobject obj, js::handlefunction fun, const js::handlevaluearray& args, js::mutablehandlevalue rval); bool js_callfunctionname(jscontext *cx, js::handleobject obj, const char *name, const js::handlevaluearray& args, js::mutablehandlevalue rval); bool js_callfunctionvalue(jscontext *cx, js::handleobject obj, js::handlevalue fval, const js::handlevaluearray& args, js::mutablehandlevalue rval); /* obsolete since jsapi 30 */ bool js_callfunction(jscontext *cx, jsobject *obj, jsfunction *fun, unsigned argc, jsval *argv, jsval *rval); bool js_callfunctionname(jscontext *cx, jsobject *obj, cons...
... fval js::handlevalue pointer to the function value to call.
... args const js::handlevaluearray &amp; reference to the array of argument values to pass to the function.
...obsolete since jsapi 30 rval js::mutablehandlevalue out parameter.
JS_DefineProperty
syntax bool js_defineproperty(jscontext *cx, js::handleobject obj, const char *name, js::handlevalue value, unsigned attrs, jsnative getter = nullptr, jsnative setter = nullptr); bool js_defineproperty(jscontext *cx, js::handleobject obj, const char *name, js::handleobject value, unsigned attrs, jsnative getter = nullptr, jsnative setter = nullptr); bool js_defineproperty(jscontext *cx, js::handleobject obj, const char *name, js::handlestring value, unsigned attrs, jsnative getter = nullptr, jsnative setter = nullptr); bool js_defineproperty(jscontext *cx, js::handleobject obj, const char *name, int32_t value, unsigned attrs, ...
... jsnative getter = nullptr, jsnative setter = nullptr); bool js_defineproperty(jscontext *cx, js::handleobject obj, const char *name, double value, unsigned attrs, jsnative getter = nullptr, jsnative setter = nullptr); bool js_defineucproperty(jscontext *cx, js::handleobject obj, const char16_t *name, size_t namelen, js::handlevalue value, unsigned attrs, jsnative getter = nullptr, jsnative setter = nullptr); bool js_defineucproperty(jscontext *cx, js::handleobject obj, const char16_t *name, size_t namelen, js::handleobject value, unsigned attrs, jsnative getter = nullptr, jsnative setter = nullptr); bool js_defineucproperty(jscontext *cx, js::handleobject obj, ...
...cx, js::handleobject obj, js::handleid id, js::handle<jspropertydescriptor> desc); bool js_defineucproperty(jscontext *cx, js::handleobject obj, const char16_t *name, size_t namelen, js::handle<jspropertydescriptor> desc); // ---- added in spidermonkey 1.8.1 ---- bool js_definepropertybyid(jscontext *cx, js::handleobject obj, js::handleid id, js::handlevalue value, unsigned attrs, jsnative getter = nullptr, jsnative setter = nullptr); bool js_definepropertybyid(jscontext *cx, js::handleobject obj, js::handleid id, js::handleobject value, unsigned attrs, jsnative getter = nullptr, jsnative setter = nullptr); bool js_definepropertybyid(jscontext *cx, js::handleo...
... value js::handlevalue or js::handleobject or js::handlestring or int32_t or uint32_t or double initial stored value for the new property.
JS_ExecuteScript
syntax bool js_executescript(jscontext *cx, js::handlescript script, js::mutablehandlevalue rval); // added in spidermonkey 45 bool js_executescript(jscontext *cx, js::handlescript script); // added in spidermonkey 45 bool js_executescript(jscontext *cx, js::autoobjectvector &scopechain, js::handlescript script, js::mutablehandlevalue rval); // added in spidermonkey 36 bool js_executescript(jscontext *cx, js::autoobjectvector &scopechain, js::handlescript script); // added in spidermonkey 36 bool js_executescript(jscontext *cx, js::handleobject obj, js::handlescript script, js::mutablehandlevalue rval); // obsolete since jsapi 39 bool js_executescript(jscontext *cx, js::handleobject obj, js...
... rval js::mutablehandlevalue out parameter.
... to execute a script that has not been compiled, use js::evaluate instead.
... see also mxr id search for js_executescript mxr id search for js::cloneandexecutescript js::compile js::evaluate bug 993438 bug 1145294 -- removed obj from js::cloneandexecutescript.
JS_SetElement
syntax /* added in spidermonkey 31 */ bool js_setelement(jscontext *cx, js::handleobject obj, uint32_t index, js::handlevalue v); bool js_setelement(jscontext *cx, js::handleobject obj, uint32_t index, js::handleobject v); bool js_setelement(jscontext *cx, js::handleobject obj, uint32_t index, js::handlestring v); bool js_setelement(jscontext *cx, js::handleobject obj, uint32_t index, int32_t v); bool js_setelement(jscontext *cx, js::handleobject obj, uint32_t index, uint32_t v); bool js_setelement(jscontext *cx, js::handleobject obj, uint32_t index, double v); /* obsolete since jsapi 29 */ bool js_setelement(jscontext *cx, js::handleobject...
... obj, uint32_t index, js::mutablehandlevalue vp); name type description cx jscontext * the context in which to set the element.
... v js::handlevalue or js::handleobject or js::handlestring or int32_t or uint32_t or double the value to assign to the element.
... added in spidermonkey 31 vp js::mutablehandlevalue in/out parameter.
SpiderMonkey 1.8.5
js_newdouble, js_newdoublevalue, and js_newnumbervalue are gone.
...n js_compileucfunctionforprincipalsversion js_compileucscriptforprincipalsversion js_consumejsontext (removed in future releases, replaced with js_parsejson) js_decompilescriptobject js_deepfreezeobject js_definefunctionbyid js_defineownproperty js_definepropertybyid js_deletepropertybyid js_deletepropertybyid2 js_doubleisint32 js_encodestringtobuffer js_entercrosscompartmentcall js_evaluatescriptforprincipalsversion js_evaluateucscriptforprincipalsversion js_executeregexp js_executeregexpnostatics js_executescriptversion js_forget_string_flatness js_fileescapedstring js_finishjsonparse (removed in future releases, replaced with js_parsejson) js_flatstringequalsascii js_flattenstring js_flushcaches js_freezeobject js_getcompartmentprivate js_getemptystring js_getfla...
...root js_clearnewbornroots – no longer needed js_clearoperationcallback js_clearregexproots js_decompilescript js_destroyscript js_enterlocalrootscope js_executescriptpart js_forgetlocalroot js_getfunctionname js_getoperationlimit js_getscriptobject js_getstringbytes js_getstringchars js_isassigning js_leavelocalrootscope js_leavelocalrootscopewithresult js_newdouble js_newdoublevalue js_newscriptobject js_newstring js_poparguments js_pusharguments js_pushargumentsva js_removeroot js_removerootrt js_sealobject js_setbranchcallback js_setcallreturnvalue2 js_setcheckobjectaccesscallback js_setobjectprincipalsfinder js_setoperationlimit js_setprincipalstranscoder api changes operation callback js_setoperationcallback was introduced in js 1.8.0, replacing the bran...
...the jsval_to_double and double_to_jsval macros have been updated to work directly on jsdoubles rather than their pointers, and the js_newdoublevalue and js_newdouble interfaces have been removed.
SpiderMonkey 38
js::clonefunctionobject (bug 1088228) interned_string_to_jsid (bug 1045900) js::construct (bug 1017109) js::createerror (bug 984048) js::falsehandlevalue (bug 959787) js::handlesymbol (bug 645416) js::identifystandardconstructor (bug 976148) js::iscallable (bug 1065811) js::isconstructor (bug 1065811) js::mutablehandlesymbol (bug 645416) js::ordinarytoprimitive (bug 1103152) js::propertyspecnameequalsid (bug 1082672) js::propertyspecnameissymbol (bug 1082672) js::propertyspecnametopermanentid (bug 1082672) js::protokeytoid (bug 987669)...
... js::rootedsymbol (bug 645416) js::truehandlevalue (bug 959787) jsconstintegerspec (bug 1066020) jsid_is_symbol (bug 645416) jsid_to_symbol (bug 645416) jsprop_define_late (bug 825199) jsprop_ignore_enumerate (bug 1037770) jsprop_ignore_permanent (bug 1037770) jsprop_ignore_readonly (bug 1037770) jsprop_ignore_value (bug 1037770) jsprop_propop_accessors (bug 1088002) jsprop_redefine_nonconfigurable (bug 1101123) js_addfinalizecallback (bug 996785) js_defineconstintegers (bug 1066020) js_getflatstringcharat (bug 1034627) js_getfunctionscript (bug 1069694) js_getlatin1flatstringchars (bug 1037869) js_getlatin1internedstringchars (bug 1037869) js_getlatin1stringcharsandlength (bug 1032726) js_getstringcharat (bug 1034627) js_gettwobyteexternalstringchars (bug 1034627) js_get...
...ddnamedvalueroot (bug 1107639) js::addnamedvaluerootrt (bug 1107639) js::addobjectroot (bug 1107639) js::addstringroot (bug 1107639) js::addvalueroot (bug 1107639) js::removeobjectroot (bug 1107639) js::removeobjectrootrt (bug 1107639) js::removescriptroot (bug 1107639) js::removescriptrootrt (bug 1107639) js::removestringroot (bug 1107639) js::removestringrootrt (bug 1107639) js::removevalueroot (bug 1107639) js::removevaluerootrt (bug 1107639) jsclass_new_enumerate (bug 1097267) jsclass_new_resolve (bug 993026) jsid_is_object (bug 915482) jsnewresolveop (bug 993026) jsval_is_boolean (bug 952650) jsval_is_double (bug 952650) jsval_is_gcthing (bug 952650) jsval_is_int (bug 952650) jsval_is_null (bug 952650) jsval_is_number (bug 952650) jsval_is_primitive (bug 952650) js...
...t (bug 1043281) js_clonefunctionobject (bug 1089026) js_compilefunction (bug 1089026) js_compileucfunction (bug 1089026) js_convertarguments (bug 1125784) js_convertargumentsva (bug 1125784) js_convertstub (bug 1103152) js_defineownproperty (bug 1017323) js_deletepropertystub (bug 1103152) js_doubletoint32 (bug 1112774) js_doubletouint32 (bug 1112774) js_enumeratestub (bug 1103152) js_evaluatescript (bug 1100579) js_evaluateucscript (bug 1100579) js_executescriptversion (bug 1095660) js_getflatstringchars (bug 1037869) js_getfunctioncallback (bug 1103269) js_getinternedstringchars (bug 1037869) js_getinternedstringcharsandlength (bug 1037869) js_getstringcharsandlength (bug 1037869) js_getstringcharsz (bug 1037869) js_getstringcharszandlength (bug 1037869) js_gettypename ...
Components.utils
evalinsandbox() runs javascript code in a sandbox, usually used to run code with restricted privileges.
... evalinwindow() removed in gecko 34.
... evaluate javascript code in a less-privileged javascript context.
... properties property type description sandbox nsixpccomponents_utils_sandbox creates sandbox objects for use with evalinsandbox().
mozIStorageFunction
last changed in gecko 1.9.1.4 (firefox 3.5.4) inherits from: nsisupports method overview nsivariant onfunctioncall(in mozistoragevaluearray afunctionarguments); methods onfunctioncall() the implementation of the function.
... nsivariant onfunctioncall( in mozistoragevaluearray afunctionarguments ); parameters afunctionarguments a mozistoragevaluearray holding the arguments passed in to the function.
...class squarefunction : public mozistoragefunction { public: ns_imethod onfunctioncall(mozistoragevaluearray *aarguments, nsivariant **_result) { print32 value; nsresult rv = aarguments->getint32(&value); ns_ensure_success(rv, rv); nscomptr<nsiwritablevariant> result = do_createinstance("@mozilla.org/variant;1"); ns_ensure_true(result, ns_error_out_of_memory); rv = result->setasint64(value * value); ns_ensure_success(rv, rv); ...
... mozistoragevaluearray wraps an array of sql values, such as a result row.
nsIDOMXPathExpression
dom/interfaces/xpath/nsidomxpathexpression.idlscriptable represents a compiled xpath query returned from nsidomxpathevaluator.createexpression or document.createexpression inherits from: nsisupports last changed in gecko 1.7 method overview nsisupports evaluate(in nsidomnode contextnode, in unsigned short type, in nsisupports result) methods evaluate() evaluate the xpath expression.
... nsisupports evaluate( in nsidomnode contextnode, in unsigned short type, in nsisupports result ); parameters contextnode a dom node to evaluate the xpath expression against.
... to evaluate against a whole document, use the document.documentelement method to get the node to evaluate against.
...see also introduction to using xpath in javascript nsidomxpathevaluator document.evaluate document object model (dom) level 3 xpath specification nsidomxpathresult ...
Xray vision
for example: the detail property of a customevent fired by content could be a javascript object or date as well as a string or a primitive the return value of evalinsandbox() and any properties attached to the sandbox object may be pure javascript objects also, the webidl specifications are starting to use javascript types such as date and promise: since webidl definition is the basis of dom xrays, not having xrays for these javascript types starts to seem arbitrary.
...rate from their javascript representation, so the xray implementation can go straight to the c++ state and guarantee that the object will behave as its specification defines: // chrome code var sandboxscript = 'date.prototype.getfullyear = function() {return 1000};' + 'var date = new date(); '; var sandbox = components.utils.sandbox("https://example.org/"); components.utils.evalinsandbox(sandboxscript, sandbox); // date objects are xrayed console.log(sandbox.date.getfullyear()); // -> 2014 // but you can waive xray vision console.log(components.utils.waivexrays(sandbox.date).getfullyear()); // -> 1000 to test out examples like this, you can use the scratchpad in browser context for the code snippet, and the browser console to see the expected output.
... these rules are demonstrated in the script below, which evaluates a script in a sandbox, then examines the object attached to the sandbox.
... value: "smith"' + '});' + 'object.defineproperty(me, "middlename", {' + ' enumerable: true,' + ' configurable: true,' + ' get: function() { return "wait, is this really a getter?"; }' + '});'; var sandbox = components.utils.sandbox("https://example.org/"); components.utils.evalinsandbox(sandboxscript, sandbox); // 1) trying to access properties in the prototype that have been redefined // (non-own properties) will show the original 'native' version // note that functions are not included in the output console.log("1) property redefined in the prototype:"); console.log(sandbox.me.tosource()); // -> "({firstname:"joe", address:{street:"main street"}, lastname:"smith"})" ...
Debugger.Source - Firefox Developer Tools
currently only entire modules evaluated via new webassembly.module are represented.
...for scripts created by eval or the function constructor, this may be a synthesized filename, starting with a valid url and followed by information tracking how the code was introduced into the system; the entire string is not a valid url.
... (note that code passed to eval, the function constructor, or a similar function isnot considered to be loaded from a url; the url accessor on debugger.source instances for such sources should return undefined.) if the instance refers to webassembly code, the url of the script that called new webassembly.module with the string "> wasm" appended.
...this accessor returns one of the following values: "eval", for code passed to eval.
Debugger - Firefox Developer Tools
global the source must have been evaluated in the scope of the given global object.
... note that the result may include sources that can no longer ever be used by the debuggee: say, eval code that has finished running, or source for unreachable functions.
... note that the result may include debugger.script instances for scripts that can no longer ever be used by the debuggee, say, those for eval code that has finished running, or unreachable functions.
... adoptdebuggeevalue(value) given a debuggee value value owned by an arbitrary debugger, return an equivalent debuggee value owned by this debugger.
Tutorial: Set a breakpoint - Firefox Developer Tools
we use debugger to set a breakpoint in a function, and then evaluate an expression whenever it is hit.
...reportdo.script.setbreakpoint(0, { hit: function (frame) { console.log('hit breakpoint in ' + frame.callee.name); console.log('what = ' + frame.eval('what').return); } }); console.log('finished setting breakpoint!'); in the scratchpad, ensure that no text is selected, and press the “run” button.
...then it evaluates the expression what in the given stack frame, and logs its result.
... if debugger is unable to find the report function, or the console output does not appear, evaluate the expression tabs[0].content.document.location in the console to make sure that tabs[0] indeed refers to the html file you visited.
Document - Web APIs
WebAPIDocument
the document interface is extended with the xpathevaluator interface: document.createexpression() compiles an xpathexpression which can then be used for (repeated) evaluations.
... document.evaluate() evaluates an xpath expression.
... obsolete supersede dom 2 document object model (dom) level 3 xpath specificationthe definition of 'xpathevaluator' in that specification.
... recommendation define the xpathevaluator interface which extend document.
SubtleCrypto.verify() - Web APIs
*/ async function verifymessage(publickey) { const signaturevalue = document.queryselector(".rsassa-pkcs1 .signature-value"); signaturevalue.classlist.remove("valid", "invalid"); let encoded = getmessageencoding(); let result = await window.crypto.subtle.verify( "rsassa-pkcs1-v1_5", publickey, signature, encoded ); signaturevalue.classlist.add(result ?
...*/ async function verifymessage(publickey) { const signaturevalue = document.queryselector(".rsa-pss .signature-value"); signaturevalue.classlist.remove("valid", "invalid"); let encoded = getmessageencoding(); let result = await window.crypto.subtle.verify( { name: "rsa-pss", saltlength: 32, }, publickey, signature, encoded ); signaturevalue.classlist.add(result ?
...*/ async function verifymessage(publickey) { const signaturevalue = document.queryselector(".ecdsa .signature-value"); signaturevalue.classlist.remove("valid", "invalid"); let encoded = getmessageencoding(); let result = await window.crypto.subtle.verify( { name: "ecdsa", hash: {name: "sha-384"}, }, publickey, signature, encoded ); signaturevalue.classlist.add(result ?
...*/ async function verifymessage(key) { const signaturevalue = document.queryselector(".hmac .signature-value"); signaturevalue.classlist.remove("valid", "invalid"); let encoded = getmessageencoding(); let result = await window.crypto.subtle.verify( "hmac", key, signature, encoded ); signaturevalue.classlist.add(result ?
Using Web Workers - Web APIs
function declarations after the importscripts() method are also kept, since these are always evaluated before the rest of the code.
...so for example, suppose a document is served with the following header: content-security-policy: script-src 'self' among other things, this will prevent any scripts it includes from using eval().
... however, if the script constructs a worker, code running in the worker's context will be allowed to use eval().
... to illustrate this, let's create for didactical purpose a function named emulatemessage(), which will simulate the behavior of a value that is cloned and not shared during the passage from a worker to the main page or vice versa: function emulatemessage(vval) { return eval('(' + json.stringify(vval) + ')'); } // tests // test #1 var example1 = new number(3); console.log(typeof example1); // object console.log(typeof emulatemessage(example1)); // number // test #2 var example2 = true; console.log(typeof example2); // boolean console.log(typeof emulatemessage(example2)); // boolean // test #3 var example3 = new string('hello world'); console.log(typeof example3);...
WindowOrWorkerGlobalScope.setInterval() - Web APIs
this syntax is not recommended for the same reasons that make using eval() a security risk.
...amap[npos]++ : bexit = true; if (beraseandstop && (orel.ref.nodetype - 1 | 1) === 3 && orel.ref.nodevalue) { bexit = true; ocurrent = orel.ref; spart = ocurrent.nodevalue; ocurrent.nodevalue = ''; } osheet.ref.appendchild(orel.ref); if (bexit) { return false; } } amap.length--; return true; } function typewrite () { if (spart.length === 0 && scroll(asheets[nidx], 0, true) && nidx++ === asheets.length - 1) { clean(); return; } ...
... ocurrent.nodevalue += spart.charat(0); spart = spart.slice(1); } function sheet (onode) { this.ref = onode; if (!onode.haschildnodes()) { return; } this.parts = array.prototype.slice.call(onode.childnodes); for (var nchild = 0; nchild < this.parts.length; nchild++) { onode.removechild(this.parts[nchild]); this.parts[nchild] = new sheet(this.parts[nchild]); } } var nintervid, ocurrent = null, btyping = false, bstart = true, nidx = 0, spart = "", asheets = [], amap = []; this.rate = nrate || 100; this.play = function () { if (btyping) { return; } if (bstart) { var aitems = document.queryselectorall(sselector); if (aitems.length === 0) { return; } for (var nitem = 0; nitem < aitems.length; nitem++) { ...
... /* uncomment the following line if you have previously hidden your elements via css: */ // aitems[nitem].style.visibility = "visible"; } bstart = false; } nintervid = setinterval(typewrite, this.rate); btyping = true; }; this.pause = function () { clearinterval(nintervid); btyping = false; }; this.terminate = function () { ocurrent.nodevalue += spart; spart = ""; for (nidx; nidx < asheets.length; scroll(asheets[nidx++], 0, false)); clean(); }; } /* usage: */ var otwexample1 = new typewriter(/* elements: */ '#article, h1, #info, #copyleft', /* frame rate (optional): */ 15); /* default frame rate is 100: */ var otwexample2 = new typewriter('#controls'); /* you can also change the frame rate value modifying the "rate"...
XPathExpression - Web APIs
this interface is a compiled xpath expression that can be evaluated on a document or specific node to return information from its dom tree.
... objects of this type are created by calling xpathevaluator.createexpression().
... methods xpathexpression.evaluate() evaluates the xpath expression on the given node or document.
... html <div>xpath example</div> <div>number of &lt;div&gt;s: <output></output></div> javascript var xpath = "//div"; var evaluator = new xpathevaluator(); var expression = evaluator.createexpression(xpath); var result = expression.evaluate(document, xpathresult.ordered_node_snapshot_type); document.queryselector("output").textcontent = result.snapshotlength; result specifications specification status comment document object model (dom) level 3 xpath specificationthe definition of 'xpathexpression' in that specification.
Accessibility Information for Web Authors - Accessibility
wave 4.0 beta (web accessibility versatile evaluator) from webaim and sponsored by temple university institute on disabilities wave 4.0 beta is another powerful, free online webpage accessibility validation service that identifies accessibility errors and reports accessibility warnings about webpage related to section 508 standards and/or the wcag guidelines.
... its purpose is to aid humans in the web accessibility evaluation process.
... you can install a custom wave toolbar in firefox for a quick, easy and convenient evaluation of web pages directly within firefox.
...color contrast analyzer algorithm is based on the formula provided in techniques for accessibility evaluation and repair tools from w3c.
Web Accessibility: Understanding Colors and Luminance - Accessibility
unless it is known that another color space will be used to process and display the content, authors should evaluate using srgb colorspace.
...generally speaking, most of the focus is on luminance when attempting to ensure that there is enough contrast between text and its background, or, in evaluating for the possibility of inducing seizures in those sensitive to photosensitive seizures.
... measuring relative luminance when evaluating luminance, bear in mind the w3c's wiki on relative luminance "almost all systems used today to view web content assume srgb encoding.
... unless it is known that another color space will be used to process and display the content, authors should evaluate using srgb colorspace.
Functions - JavaScript
for example, the following function definition defines myfunc only if num equals 0: var myfunc; if (num === 0) { myfunc = function(theobject) { theobject.make = 'toyota'; } } in addition to defining functions as described here, you can also use the function constructor to create functions from a string at runtime, much like eval().
... in the following example, if no value is provided for b, its value would be undefined when evaluating a*b, and a call to multiply would normally have returned nan.
...thus, in the following code, the this within the function that is passed to setinterval has the same value as this in the enclosing function: function person() { this.age = 0; setinterval(() => { this.age++; // |this| properly refers to the person object }, 1000); } var p = new person(); predefined functions javascript has several top-level, built-in functions: eval() the eval() method evaluates javascript code represented as a string.
... uneval() the uneval() method creates a string representation of the source code of an object.
Grammar and types - JavaScript
evaluating variables a variable declared using the var or let statement with no assigned value specified has the value of undefined.
...in the following code, the variable input is not assigned a value, and the if statement evaluates to true.
... var a; a + 2; // evaluates to nan when you evaluate a null variable, the null value behaves as 0 in numeric contexts and as false in boolean contexts.
... if an array is created using a literal in a top-level script, javascript interprets the array each time it evaluates the expression containing the array literal.
Date.prototype.setFullYear() - JavaScript
syntax dateobj.setfullyear(yearvalue[, monthvalue[, datevalue]]) parameters yearvalue an integer specifying the numeric value of the year, for example, 1995.
... datevalue optional.
...if you specify the datevalue parameter, you must also specify the monthvalue.
... description if you do not specify the monthvalue and datevalue parameters, the values returned from the getmonth() and getdate() methods are used.
String - JavaScript
let s_prim = 'foo' let s_obj = new string(s_prim) console.log(typeof s_prim) // logs "string" console.log(typeof s_obj) // logs "object" string primitives and string objects also give different results when using eval().
... primitives passed to eval are treated as source code; string objects are treated as all other objects are, by returning the object.
... for example: let s1 = '2 + 2' // creates a string primitive let s2 = new string('2 + 2') // creates a string object console.log(eval(s1)) // returns the number 4 console.log(eval(s2)) // returns the string "2 + 2" for these reasons, the code may break when it encounters string objects when it expects a primitive string instead, although generally, authors need not worry about the distinction.
... console.log(eval(s2.valueof())) // returns the number 4 escape notation special characters can be encoded using escape notation: code output \xxx (where xxx is 1–3 octal digits; range of 0–377) iso-8859-1 character / unicode code point between u+0000 and u+00ff \' single quote \" double quote \\ backslash \n new line \r carriage return \v vertical tab \t tab \b backspace \f form feed \uxxxx (where xxxx is 4 hex digits; range of 0x0000–0xffff) utf-16 code unit / unicode code point between u+0000 and u+ffff \u{x} ...
Comma operator (,) - JavaScript
the comma operator (,) evaluates each of its operands (from left to right) and returns the value of the last operand.
... this lets you create a compound expression in which multiple expressions are evaluated, with the compound expression's final value being the value of the rightmost of its member expressions.
...in the following example, a is set to the value of b = 3 (which is 3), but the c = 4 expression still evaluates and its result returned to console (i.e., 4).
...as stated, only the last element will be returned but all others are going to be evaluated as well.
Grouping operator ( ) - JavaScript
the grouping operator ( ) controls the precedence of evaluation in expressions.
... syntax ( ) description the grouping operator consists of a pair of parentheses around an expression or sub-expression to override the normal operator precedence so that expressions with lower precedence can be evaluated before an expression with higher priority.
... examples using the grouping operator overriding multiplication and division first, then addition and subtraction to evaluate addition first.
... var a = 1; var b = 2; var c = 3; // default precedence a + b * c // 7 // evaluated by default like this a + (b * c) // 7 // now overriding precedence // addition before multiplication (a + b) * c // 9 // which is equivalent to a * c + b * c // 9 specifications specification ecmascript (ecma-262)the definition of 'the grouping operator' in that specification.
Logical OR (||) - JavaScript
short-circuit evaluation the logical or expression is evaluated left to right, it is tested for possible "short-circuit" evaluation using the following rule: (some truthy expression) || expr is short-circuit evaluated to the truthy expression.
... short circuit means that the expr part above is not evaluated, hence any side effects of doing so do not take effect (e.g., if expr is a function call, the calling never takes place).
... this happens because the value of the operator is already determined after the evaluation of the first operand.
... conversion rules for booleans converting and to or the following operation involving booleans: bcondition1 && bcondition2 is always equal to: !(!bcondition1 || !bcondition2) converting or to and the following operation involving booleans: bcondition1 || bcondition2 is always equal to: !(!bcondition1 && !bcondition2) removing nested parentheses as logical expressions are evaluated left to right, it is always possible to remove parentheses from a complex expression following some rules.
switch - JavaScript
the switch statement evaluates an expression, matching the expression's value to a case clause, and executes statements associated with that case, as well as statements in cases that follow the matching case.
... description a switch statement first evaluates its expression.
... it then looks for the first case clause whose expression evaluates to the same value as the result of the input expression (using the strict comparison, ===) and transfers control to that clause, executing the associated statements.
... examples using switch in the following example, if expr evaluates to bananas, the program matches the value with case case 'bananas' and executes the associated statement.
systemLanguage - SVG: Scalable Vector Graphics
the attribute evaluates to "true" if one of the language tags indicated by user preferences is a case-insensitive match or prefix (followed by a "-") of one of the language tags given in the value of this parameter.
... otherwise it evaluates to "false".
... if the attribute is not present, then it implicitly evaluates to "true".
... if a null string or empty string value is given, the attribute evaluates to "false".
/loader - Archive of obsolete content
let sandbox = sandbox({ name: 'resource:///modules/foo/bar.js', wantxrays: false, prototype: { console: { log: dump.bind(dump, 'log: '), info: dump.bind(dump, 'info: '), warn: dump.bind(dump, 'warn: '), error: dump.bind(dump, 'error: ') } } }); evaluate() evaluates code in the supplied sandbox.
... if options.source is provided then its value is evaluated, otherwise source is read from the supplied uri.
... // load script from the given location to a given sandbox: evaluate(sandbox, 'resource://path/to/script.js') // evaluate `code` as if it was from `foo/bar.js`: evaluate(sandbox, 'foo/bar.js', { source: code, version: '1.7' // you could also use other options described above.
Modules - Archive of obsolete content
the use of eval() will probably not be of concern because it is only being used on the exported_symbols array which should not depend on user input.
... // at the end of your code: (assuming neither 'i' nor 'thatobj' is being exported!) for (var i=0; i < exported_symbols.length; i++) {thatobj[exported_symbols[i]] = eval(exported_symbols[i]);} } or for one-time-only usage of a module: (function (thatobj) { thatobj = thatobj || window; var exported_symbols = [ // put the symbols here ]; // your code here...
... // at the end of your code: (assuming neither 'i' nor 'thatobj' is being exported!) for (var i=0; i < exported_symbols.length; i++) {thatobj[exported_symbols[i]] = eval(exported_symbols[i]);} })(); // can put an object argument here ...
Connecting to Remote Content - Archive of obsolete content
json used to be risky in terms of security because the favored way of parsing it was to use the javascript eval function.
... since eval executes any code contained in the string, workarounds had to be devised in order to close security holes.
....onload = function(aevent) { let responsexml = aevent.target.responsexml; let rootelement = responsexml.documentelement; if (rootelement && "parseerror" != rootelement.tagname) { let shopelements = rootelement.getelementsbytagname("shop"); let totalelement = rootelement.getelementsbytagname("total")[0]; window.alert(shopelements[1].getelementsbytagname("name")[0].firstchild.nodevalue); // => orange window.alert(totalelement.firstchild.nodevalue); // => 2 } }; using dom functions is good for simple xml documents, but dom manipulation code can become too complicated if the documents are more complex.
Appendix E: DOM Building and Insertion (HTML & XUL) - Archive of obsolete content
for security reasons, and to prevent errors, care needs to be taken to avoid evaluating arbitrary text as html.
...utes should be used, one for each variable: function clickify(elem, address) { elem.setattribute("href", address); elem.setattribute("onclick", "openwindow(this.getattribute('href'))"); } escaping functions when the code fragment in question is not an event handler attribute and there is no feasible way to pass the data through other means, they must be escaped with functions such as uneval, string.quote, json.stringify, or number.
... function createscript(href, otherstuff) { var script = function (href, otherstuff) { dostuffwith(href); dootherstuff(); for (var somestuff in otherstuff) dosomemorestuffwith(somestuff); } return script.tosource() + "(" + [string.quote(href), uneval(otherstuff)] + ")"; } safely using remote html in the above cases, we're working with text content that needs to appear in generated dom.
Venkman Introduction - Archive of obsolete content
this will cause the source of function to be displayed in the source code view, the local variables view will change to display variables local to the selected stack frame, and script evaluated in the interactive session view will be relative to the selected frame.
... in the interactive session's input field, enter this.fpaused venkman evaluates the expression, giving you [boolean] false back.
... the best way to get to know venkman, of course, is to play around with it — to set it up in the way that makes the most sense to you, to try loading scripts and setting breakpoints, evaluating expressions in the interactive session view, watching the values of variables as they change when scripts are executed, getting profile data.
Bindings - Archive of obsolete content
here is the data after the first <triple> has been evaluated.
...they are evaluated in a similar though simpler manner than the triples.
...the others will be evaluated in a similar way.
datepicker - Archive of obsolete content
the datevalue property may be used to retrieve and set the date using a date object.
... attributes disabled, firstdayofweek, readonly, type, tabindex, value properties date, dateleadingzero, datevalue, disabled, month, monthleadingzero, open, readonly, tabindex, value, year, yearleadingzero examples <datepicker type="grid" value="2007-03-26"/> attributes disabled type: boolean indicates whether the element is disabled or not.
... datevalue type: date the date that is currently entered or selected in the datepicker as a date object.
timepicker - Archive of obsolete content
the value may be retrieved and changed using the value property or the datevalue property.
... attributes disabled, hideseconds, increment, readonly, tabindex, value properties amindicator, datevalue, disabled, hideseconds, hour, hourleadingzero, increment, is24hourclock, ispm, minute, minuteleadingzero, pmindicator, readonly, second, secondleadingzero, tabindex, value examples <timepicker value="12:05"/> attributes disabled type: boolean indicates whether the element is disabled or not.
... datevalue type: date the date that is currently entered or selected in the datepicker as a date object.
Choosing Standards Compliance Over Proprietary Practices - Archive of obsolete content
when projects are proposed, they are evaluated to ensure compatibility with the overall business strategy.
... product marketing must then analyze the marketability of the application/product, and then conduct in-depth technical evaluations and market research studies.
...when auditors evaluate an organizations financial health, they do so by following the fasb rules.
Example 4 - Learn web development
asslist.add('active'); }; function toggleoptlist(select, show) { var optlist = select.queryselector('.optlist'); optlist.classlist.toggle('hidden'); } function highlightoption(select, option) { var optionlist = select.queryselectorall('.option'); optionlist.foreach(function (other) { other.classlist.remove('highlight'); }); option.classlist.add('highlight'); }; function updatevalue(select, index) { var nativewidget = select.previouselementsibling; var value = select.queryselector('.value'); var optionlist = select.queryselectorall('.option'); nativewidget.selectedindex = index; value.innerhtml = optionlist[index].innerhtml; highlightoption(select, optionlist[index]); }; function getindex(select) { var nativewidget = select.previouselementsibling; return...
... function (event) { deactivateselect(select); }); }); }); window.addeventlistener('load', function () { var selectlist = document.queryselectorall('.select'); selectlist.foreach(function (select) { var optionlist = select.queryselectorall('.option'), selectedindex = getindex(select); select.tabindex = 0; select.previouselementsibling.tabindex = -1; updatevalue(select, selectedindex); optionlist.foreach(function (option, index) { option.addeventlistener('click', function (event) { updatevalue(select, index); }); }); select.addeventlistener('keyup', function (event) { var length = optionlist.length, index = getindex(select); if (event.keycode === 27) { deactivateselect(select); } if (event...
....keycode === 40 && index < length - 1) { index++; } if (event.keycode === 38 && index > 0) { index--; } updatevalue(select, index); }); }); }); result ...
Example 5 - Learn web development
asslist.add('active'); }; function toggleoptlist(select, show) { var optlist = select.queryselector('.optlist'); optlist.classlist.toggle('hidden'); } function highlightoption(select, option) { var optionlist = select.queryselectorall('.option'); optionlist.foreach(function (other) { other.classlist.remove('highlight'); }); option.classlist.add('highlight'); }; function updatevalue(select, index) { var nativewidget = select.previouselementsibling; var value = select.queryselector('.value'); var optionlist = select.queryselectorall('.option'); optionlist.foreach(function (other) { other.setattribute('aria-selected', 'false'); }); optionlist[index].setattribute('aria-selected', 'true'); nativewidget.selectedindex = index; value.innerhtml = optionlist[...
...rm.classlist.remove("no-widget"); form.classlist.add("widget"); }); window.addeventlistener('load', function () { var selectlist = document.queryselectorall('.select'); selectlist.foreach(function (select) { var optionlist = select.queryselectorall('.option'), selectedindex = getindex(select); select.tabindex = 0; select.previouselementsibling.tabindex = -1; updatevalue(select, selectedindex); optionlist.foreach(function (option, index) { option.addeventlistener('mouseover', function () { highlightoption(select, option); }); option.addeventlistener('click', function (event) { updatevalue(select, index); }); }); select.addeventlistener('click', function (event) { toggleoptlist(select); }); se...
...('blur', function (event) { deactivateselect(select); }); select.addeventlistener('keyup', function (event) { var length = optionlist.length, index = getindex(select); if (event.keycode === 27) { deactivateselect(select); } if (event.keycode === 40 && index < length - 1) { index++; } if (event.keycode === 38 && index > 0) { index--; } updatevalue(select, index); }); }); }); result ...
HTML table advanced features and accessibility - Learn web development
padding: 10px; } tbody { font-size: 90%; font-style: italic; } tfoot { font-weight: bold; } </style> </head> <body> <table> <caption>how i chose to spend my money</caption> <thead> <tr> <th>purchase</th> <th>location</th> <th>date</th> <th>evaluation</th> <th>cost (€)</th> </tr> </thead> <tfoot> <tr> <td colspan="4">sum</td> <td>118</td> </tr> </tfoot> <tbody> <tr> <td>haircut</td> <td>hairdresser</td> <td>12/09</td> <td>great idea</td> <td>30</td> </tr> ...
...looking back to our spending record example from earlier on, you could unambiguously define the column headers as column headers like this: <thead> <tr> <th scope="col">purchase</th> <th scope="col">location</th> <th scope="col">date</th> <th scope="col">evaluation</th> <th scope="col">cost (€)</th> </tr> </thead> and each row could have a header defined like this (if we added row headers as well as column headers): <tr> <th scope="row">haircut</th> <td>hairdresser</td> <td>12/09</td> <td>great idea</td> <td>30</td> </tr> screenreaders will recognize markup structured like this, and allow their users to read out the entire column ...
... returning to our spending costs example, the previous two snippets could be rewritten like this: <thead> <tr> <th id="purchase">purchase</th> <th id="location">location</th> <th id="date">date</th> <th id="evaluation">evaluation</th> <th id="cost">cost (€)</th> </tr> </thead> <tbody> <tr> <th id="haircut">haircut</th> <td headers="location haircut">hairdresser</td> <td headers="date haircut">12/09</td> <td headers="evaluation haircut">great idea</td> <td headers="cost haircut">30</td> </tr> ...
Looping code - Learn web development
a final-expression — this is always evaluated (or run) each time the loop has gone through a full iteration.
... { font-size: 16px; } .a11y-label { margin: 0; text-align: right; font-size: 0.7rem; width: 98%; } body { margin: 10px; background: #f5f9fa; } const textarea = document.getelementbyid('code'); const reset = document.getelementbyid('reset'); const solution = document.getelementbyid('solution'); let code = textarea.value; let userentry = textarea.value; function updatecode() { eval(textarea.value); } reset.addeventlistener('click', function() { textarea.value = code; userentry = textarea.value; solutionentry = jssolution; solution.value = 'show solution'; updatecode(); }); solution.addeventlistener('click', function() { if(solution.value === 'show solution') { textarea.value = solutionentry; solution.value = 'hide solution'; } else { textarea.val...
...h2 { font-size: 16px; } .a11y-label { margin: 0; text-align: right; font-size: 0.7rem; width: 98%; } body { margin: 10px; background: #f5f9fa; } const textarea = document.getelementbyid('code'); const reset = document.getelementbyid('reset'); const solution = document.getelementbyid('solution'); let code = textarea.value; let userentry = textarea.value; function updatecode() { eval(textarea.value); } reset.addeventlistener('click', function() { textarea.value = code; userentry = textarea.value; solutionentry = jssolution; solution.value = 'show solution'; updatecode(); }); solution.addeventlistener('click', function() { if(solution.value === 'show solution') { textarea.value = solutionentry; solution.value = 'hide solution'; } else { textarea.val...
Video and Audio APIs - Learn web development
add the following at the bottom of your file: function settime() { let minutes = math.floor(media.currenttime / 60); let seconds = math.floor(media.currenttime - minutes * 60); let minutevalue; let secondvalue; if (minutes < 10) { minutevalue = '0' + minutes; } else { minutevalue = minutes; } if (seconds < 10) { secondvalue = '0' + seconds; } else { secondvalue = seconds; } let mediatime = minutevalue + ':' + secondvalue; timer.textcontent = mediatime; let barlength = timerwrapper.clientwidth * (media.currenttime/media.duration); timerbar.sty...
... then we initialize two more variables — minutevalue and secondvalue.
... the actual time value to display is set as minutevalue plus a colon character plus secondvalue.
Useful string methods - Learn web development
h2 { font-size: 16px; } .a11y-label { margin: 0; text-align: right; font-size: 0.7rem; width: 98%; } body { margin: 10px; background: #f5f9fa; } const textarea = document.getelementbyid('code'); const reset = document.getelementbyid('reset'); const solution = document.getelementbyid('solution'); let code = textarea.value; let userentry = textarea.value; function updatecode() { eval(textarea.value); } reset.addeventlistener('click', function() { textarea.value = code; userentry = textarea.value; solutionentry = jssolution; solution.value = 'show solution'; updatecode(); }); solution.addeventlistener('click', function() { if(solution.value === 'show solution') { textarea.value = solutionentry; solution.value = 'hide solution'; } else { textarea.val...
...h2 { font-size: 16px; } .a11y-label { margin: 0; text-align: right; font-size: 0.7rem; width: 98%; } body { margin: 10px; background: #f5f9fa; } const textarea = document.getelementbyid('code'); const reset = document.getelementbyid('reset'); const solution = document.getelementbyid('solution'); let code = textarea.value; let userentry = textarea.value; function updatecode() { eval(textarea.value); } reset.addeventlistener('click', function() { textarea.value = code; userentry = textarea.value; solutionentry = jssolution; solution.value = 'show solution'; updatecode(); }); solution.addeventlistener('click', function() { if(solution.value === 'show solution') { textarea.value = solutionentry; solution.value = 'hide solution'; } else { textarea.val...
...2 { font-size: 16px; } .a11y-label { margin: 0; text-align: right; font-size: 0.7rem; width: 98%; } body { margin: 10px; background: #f5f9fa; } const textarea = document.getelementbyid('code'); const reset = document.getelementbyid('reset'); const solution = document.getelementbyid('solution'); let code = textarea.value; let userentry = textarea.value; function updatecode() { eval(textarea.value); } reset.addeventlistener('click', function() { textarea.value = code; userentry = textarea.value; solutionentry = jssolution; solution.value = 'show solution'; updatecode(); }); solution.addeventlistener('click', function() { if(solution.value === 'show solution') { textarea.value = solutionentry; solution.value = 'hide solution'; } else { textarea.val...
Gecko info for Windows accessibility vendors
hresult get_nodeinfo( /* [out] */ bstr *nodename, // for elements, this is the tag name /* [out] */ short *namespaceid, /* [out] */ bstr *nodevalue, /* [out] */ unsigned int *numchildren, /* [out] */ unsigned int *uniqueid, // see description of unique id's in above section on events /* [out] */ unsigned short *nodetype); the get_attributes method returns the set of attribute, value pairs for a given node, as well as the namespace id for each attribute.
... hresult get_computedstyle( /* [in] */ unsigned short maxstyleproperties, /* [in] */ boolean usealternateview, // if true, returns properties for media // as set in nsidomdocument::set_alternateviewmediatypes /* [out] */ bstr *styleproperties, /* [out] */ bstr *stylevalues, /* [out] */ unsigned short *numstyleproperties); a variation on this method is get_computedstyleforproperties, which lets turns the styleproperties array into an [in] parameter, letting you specify only those style properties you're interested in.
... hresult get_computedstyleforproperties( /* [in] */ unsigned short numstyleproperties, /* [in] */ boolean usealternateview, // if true, returns properties for media // as set in nsidomdocument::set_alternateviewmediatypes /* [in] */ bstr *styleproperties, /* [out] */ bstr *stylevalues); to scroll the document in order make a specific element visible in the window, use scrollto(boolean placetopleft).
Debugging on Windows
.* ; might be too broad: (ns|promise)[^\:]*[ss]tring.* ...add common functions to this list should probably make a .reg file for easy importing obtaining stdout and other file handles running the following command in the command window in visual studio returns the value of stdout, which can be used with various debugging methods (such as nsgenericelement::list) that take a file* param: debug.evaluatestatement {,,msvcr80d}(&__iob_func()[1]) (alternatively you can evaluate {,,msvcr80d}(&__iob_func()[1]) in the quickwatch window) similarly, you can open a file on the disk using fopen: >debug.evaluatestatement {,,msvcr80d}fopen("c:\\123", "w") 0x10311dc0 { ..snip..
... } >debug.evaluatestatement ((nsgenericelement*)0x03f0e710)->list((file*)0x10311dc0, 1) <void> >debug.evaluatestatement {,,msvcr80d}fclose((file*)0x10311dc0) 0x00000000 note that you may not see the debugging output until you flush or close the file handle.
... for example, to print curent javascript stack to stdout, evaluate this in quickwatch window: {,,xul}dumpjsstack() note: visual c++ will show you something in the quick watch window, but not the stack, you have to look in the os console for the output.
gettext
the second part is evaluated and the result of the evaluation is used to choose the right msgstr.
... in the rule above, if n equals 1, the expression is evaluated to false, or 0, so msgstr[0] will be used.
...1 : 2 is evaluated to 2, and so a msgstr[2] should be used.
PR_STATIC_ASSERT
syntax #include <prlog.h> pr_static_assert ( expression ); parameters the macro has this parameter: expression any valid expression which evaluates at compile-time to true or false.
... an expression which cannot be evaluated at compile time will cause a compiler error; see pr_assert for a runtime alternative.
... returns nothing description this macro evaluates the specified expression.
Index
signver -v -s signature_file -i signed_file -d sql:/home/my/sharednssdb signaturevalid=yes printing signature data the -a option prints all of the information contained in a signature file.
... 259 fc_getattributevalue nss no summary!
... 278 fc_setattributevalue nss no summary!
Performance Hints
eval and new function avoid calling eval when possible.
... calls to eval are slow because the script being executed must be compiled.
...for example, the code function myobject(a) { this.s = a; this.tostring = new function("return this.s"); } could be written more efficiently as function myobject(a) { this.s = a; this.tostring = function () { return this.s } } beginning with rhino 1.4 release 2, code passed to eval and new function will be interpreted rather than compiled to class files.
Rhino scopes and contexts
you can create a scope using one context and then evaluate a script using that scope and another context (either by exiting the current context and entering another, or by executing on a different thread).
... we can now use newscope as a scope for calls to evaluate scripts.
...string loadme = "regexp; getclass; java; packages; javaadapter;"; cx.evaluatestring(sealedsharedscope , loadme, "lazyload", 0, null); sealedsharedscope .sealobject(); dynamic scopes there's one problem with the setup outlined above.
Rhino shell
print([expr ...]) evaluate and print expressions.
... evaluates each expression, converts the result to a string, and prints it.
...the next invocation has no arguments, so the shell goes into interactive mode, reading and evaluating each line as it is typed in.
JS_ConvertValue
syntax bool js_convertvalue(jscontext *cx, js::handlevalue v, jstype type, js::mutablehandlevalue vp); name type description cx jscontext * the context in which to perform the conversion.
... v js::handlevalue the value to convert.
... vp js::mutablehandlevalue out parameter.
JS_GetProperty
syntax bool js_getproperty(jscontext *cx, js::handleobject obj, const char *name, js::mutablehandlevalue vp); bool js_getucproperty(jscontext *cx, js::handleobject obj, const char16_t *name, size_t namelen, js::mutablehandlevalue vp); bool js_getpropertybyid(jscontext *cx, js::handleobject obj, js::handleid id, js::mutablehandlevalue vp); // added in spidermonkey 1.8.1 name type description cx jscontext * a context.
... vp js::mutablehandlevalue out parameter.
... internally, property retrieval, including all the behavior described above, is implemented by obj's jsobjectops.getproperty callback.
JS_GetSecurityCallbacks
callback structure struct jssecuritycallbacks { jscspevalchecker contentsecuritypolicyallows; // added in spidermonkey 1.8.5 jssubsumesop subsumes; // added in spidermonkey 31 jscheckaccessop checkobjectaccess; // obsolete since jsapi 29 jsprincipalstranscoder principalstranscoder; // obsolete since jsapi 13 jsobjectprincipalsfinder findobjectprincipals; // obsolete since jsapi 13 }; ...
... name type description contentsecuritypolicyallows jscspevalchecker a pointer to the function which checks if a csp instance wants to disable eval() and friends.
...if the callbacks are default value, it returns null see also mxr id search for js_getsecuritycallbacks mxr id search for js_setsecuritycallbacks jsprincipals jscspevalchecker jssubsumesop bug 957688 - removed checkobjectaccess bug 924905 - added subsumes bug 728250 - added -js_getsecuritycallbacks and js_setsecuritycallbacks, removed js_setcontextsecuritycallbacks, js_getruntimesecuritycallbacks, and js_setruntimesecuritycallbacks ...
JS_SetProperty
syntax bool js_setproperty(jscontext *cx, js::handleobject obj, const char *name, js::handlevalue v); bool js_setucproperty(jscontext *cx, js::handleobject obj, const char16_t *name, size_t namelen, js::handlevalue v); bool js_setpropertybyid(jscontext *cx, js::handleobject obj, js::handleid id, js::handlevalue v); // added in spidermonkey 1.8.1 name type description cx jscontext * pointer to a js context from which to derive runtime information.
... obj js::handlevalue object to which the property to set belongs.
... v js::handlevalue in/out parameter.
mozIStorageAggregateFunction
last changed in gecko 1.9 (firefox 3) inherits from: nsisupports method overview void onstep(in mozistoragevaluearray afunctionarguments); nsivariant onfinal(); methods onstep() this is called for each row of results returned by the query.
... void onstep( in mozistoragevaluearray afunctionarguments ); parameters afunctionarguments a mozistoragevaluearray holding the arguments passed in to the function.
...class standarddeviationfunc : public mozistorageaggregatefunction { public: ns_imethod onstep(mozistoragevaluearray *aarguments) { print32 value; nsresult rv = aarguments->getint32(&value); ns_ensure_success(rv, rv); mnumbers.appendelement(value); } ns_imethod onfinal(nsivariant **_result) { print64 total = 0; for (pruint32 i = 0; i < mnumbers.length(); i++) total += mnumbers[i]; print32 mean = total / mnumbers.length(); nstarray<print64> data(mnumbers); ...
mozIStorageStatement
inherits from: mozistoragevaluearray last changed in gecko 1.9.2 (firefox 3.6 / thunderbird 3.1 / fennec 1.0) for an introduction on how to use this interface, see the storage overview document.
...row data may be accessed using mozistoragevaluearray methods on the statement.
... void execute(); see also storage introduction and how-to article mozistorageconnection database connection to a specific file or in-memory data storage mozistoragevaluearray wraps an array of sql values, such as a result row.
nsIDictionary
method overview boolean haskey(in string key); void getkeys(out pruint32 count, [retval, array, size_is(count)] out string keys); nsisupports getvalue(in string key); void setvalue(in string key, in nsisupports value); nsisupports deletevalue(in string key); void clear(); methods haskey() check if a given key is present in the dictionary.
... deletevalue() find the value indicated by the key.
... nsisupports deletevalue( in string key ); parameters key the key indicating the pair to be removed.
nsIMsgSearchCustomTerm
* * @return true if enabled */ boolean getenabled(in nsmsgsearchscopevalue scope, in nsmsgsearchopvalue op); getavailable /** * is this custom term available?
... * * @return true if available */ boolean getavailable(in nsmsgsearchscopevalue scope, in nsmsgsearchopvalue op); getavailableoperators /** * list the valid operators for this term.
... * * @param scope search scope (nsmsgsearchscope) * @param length object to hold array length * * @return array of operators */ void getavailableoperators(in nsmsgsearchscopevalue scope, out unsigned long length, [retval, array, size_is(length)] out nsmsgsearchopvalue operators); match /** * apply the custom search term to a message * * @param msghdr header database reference representing the message * @param searchvalue user-set value to use in the search * @param searchop search operator (contains, ishigherthan, etc.) * * @return true if the term matches the message, else false */ boolea...
nsIWindowsRegKey
ng relpath, in unsigned long mode); nsiwindowsregkey openchild(in astring relpath, in unsigned long mode); acstring readbinaryvalue(in astring name); unsigned long long readint64value(in astring name); unsigned long readintvalue(in astring name); astring readstringvalue(in astring name); void removechild(in astring relpath); void removevalue(in astring name); void startwatching(in boolean recurse); void stopwatching(); void writebinaryvalue(in astring name, in acstring data); void writeint64value(in astring name, in unsigned long long data); void writeintvalue(in astring name, in unsigned long data); void writestringvalue(in astring name, in astring data); attributes ...
... removevalue() this method removes the value with the given name.
... void removevalue( in astring name ); parameters name the name of the value to be removed.
nsIXFormsModelElement
1.0 66 introduced gecko 1.8 obsolete gecko 1.9.1 inherits from: nsisupports last changed in gecko 1.8 (firefox 1.5 / thunderbird 1.5 / seamonkey 1.0) method overview nsidomdocument getinstancedocument(in domstring instanceid); void rebuild(); void recalculate(); void refresh(); void revalidate(); methods getinstancedocument() nsidomdocument getinstancedocument( in domstring instanceid ); parameters instanceid the id of the instance element to be returned.
...revalidate() signals the xforms processor to perform a full revalidation of the given xforms model.
... void revalidate(); parameters none.
CData
return value a string that, ideally, should be able to be evaluated to produce a new cdata object containing a copy of the original object.
... in theory, in other words, the following javascript expression should return a copy of the original cdata object: eval(dataobject.tosource()); tostring() returns a string identifying the data.
...6 (so 37 if count from 1), we see 183, and at 77 we see char code of 0 if casted to unsigned_char, if casted to char we see -73 at pos 36 but pos 77 still 0, if casted to jschar we see chineese characters in all spots expect spaces even null terminator is a chineese character console.info('ptrasarr.length:', ptrasarr.length); //console.log('debug-msg :: datacasted:', datacasted, uneval(datacasted), datacasted.tostring()); var charcode = []; var fromcharcode = [] for (var i=0; i<ptrasarr.length; i++) { //if known_len is correct, then will not hit null terminator so like in example of "_scratchpad/entehandle.js at master · noitidart/_scratchpad mdnfirefox" if you pass length of 77, then null term will not get hit by this loop as null term is at pos 77 and...
Browser Console - Firefox Developer Tools
at the bottom, a command line interpreter enables you to evaluate javascript expressions.
... like the web console, the command line interpreter enables you to evaluate javascript expressions in real time:also like the web console's command line interpreter, this command line supports autocomplete, history, and various keyboard shortcuts and helper commands.
...you can confirm this by evaluating window: this means you can control the browser: opening, closing tabs and windows and changing the content that they host, and modify the browser's ui by creating, changing and removing xul elements.
Index - Firefox Developer Tools
we use debugger to set a breakpoint in a function, and then evaluate an expression whenever it is hit.
... 120 debug eval sources you can debug javascript code that is evaluated dynamically, either as a string passed to eval() or as a string passed to the function constructor.
...when the program reaches the line, the debugger pauses only if the breakpoint's specified expression evaluates to true.
BluetoothRemoteGATTDescriptor - Web APIs
value; promise<arraybuffer> readvalue(); promise<void> writevalue(buffersource value); }; properties bluetoothremotegattdescriptor.characteristicread only returns the bluetoothremotegattcharacteristic this descriptor belongs to.
... bluetoothremotegattdescriptor.writevalue() sets the value property to the bytes contained in an arraybuffer and returns a promise.
... nochrome android full support 57firefox android no support noopera android full support 44safari ios no support nosamsung internet android full support 7.0writevalue experimentalchrome full support 57notes full support 57notes notes macos only.
CSS Object Model (CSSOM) - Web APIs
reference animationevent caretposition css csscharsetrule cssconditionrule csscounterstylerule cssfontfacerule cssfontfeaturevaluesmap cssfontfeaturevaluesrule cssgroupingrule cssimportrule csskeyframerule csskeyframesrule cssmarginrule cssmediarule cssnamespacerule csspagerule cssrule cssrulelist cssstyledeclaration cssstylesheet cssstylerule csssupportsrule cssvariablesmap cssviewportrule elementcssinlinestyle fontface fontfaceset fontfacesetloadevent geometryutils getstyleutils linkstyle medialist mediaquerylist mediaquerylistevent mediaquerylis...
... css typed object model cssimagevalue csskeywordvalue cssmathinvert cssmathmax cssmathmin cssmathnegate cssmathproduct cssmathsum cssmathvalue cssmatrixcomponent cssnumericarray cssnumericvalue cssperspective csspositionvalue cssrotate cssscale cssskew cssskewx cssskewy cssstylevalue csstransformcomponent csstransformvalue csstranslate cssunitvalue cssunparsedvalue cssvariablereferencevalue stylepropertymap stylepropertymapreadonly obsolete cssom interfaces ...
... cssprimitivevalue cssvalue cssvaluelist tutorials determining the dimensions of elements (it needs some updating as it was made in the dhtml/ajax era).
Event.eventPhase - Web APIs
WebAPIEventeventPhase
the eventphase read-only property of the event interface indicates which phase of the event flow is currently being evaluated.
... syntax let phase = event.eventphase; value returns an integer value which specifies the current evaluation phase of the event flow.
... constants event phase constants these values describe which phase the event flow is currently being evaluated.
EventTarget.addEventListener() - Web APIs
html <table id="outside"> <tr><td id="t1">one</td></tr> <tr><td id="t2">two</td></tr> </table> javascript // function to change the content of t2 function modifytext() { const t2 = document.getelementbyid("t2"); if (t2.firstchild.nodevalue == "three") { t2.firstchild.nodevalue = "two"; } else { t2.firstchild.nodevalue = "three"; } } // add event listener to table const el = document.getelementbyid("outside"); el.addeventlistener("click", modifytext, false); in this code, modifytext() is a listener for click events registered using addeventlistener().
... html <table id="outside"> <tr><td id="t1">one</td></tr> <tr><td id="t2">two</td></tr> </table> javascript // function to change the content of t2 function modifytext(new_text) { const t2 = document.getelementbyid("t2"); t2.firstchild.nodevalue = new_text; } // function to add event listener to table const el = document.getelementbyid("outside"); el.addeventlistener("click", function(){modifytext("four")}, false); notice that the listener is an anonymous function that encapsulates code that is then, in turn, able to send parameters to the modifytext() function, which is responsible for actually responding to the event.
... html <table id="outside"> <tr><td id="t1">one</td></tr> <tr><td id="t2">two</td></tr> </table> javascript // function to change the content of t2 function modifytext(new_text) { const t2 = document.getelementbyid("t2"); t2.firstchild.nodevalue = new_text; } // add event listener to table with an arrow function const el = document.getelementbyid("outside"); el.addeventlistener("click", () => { modifytext("four"); }, false); result please note that while anonymous and arrow functions are similar, they have different this bindings.
Geolocation API - Web APIs
in both cases, the method call takes up to three arguments: a mandatory success callback: if the location retrieval is successful, the callback executes with a geolocationposition object as its only parameter, providing access to the location data.
... an optional error callback: if the location retrieval is unsuccessful, the callback executes with a geolocationpositionerror object as its only parameter, providing access information on what went wrong.
... an optional positionoptions object, which provides options for retrieval of the position data.
IDBKeyRange.bound() - Web APIs
WebAPIIDBKeyRangebound
here we declare a keyrangevalue = idbkeyrange.bound("a", "f"); — a range between values of "a" and "f".
... we open a transaction (using idbtransaction) and an object store, and open a cursor with idbobjectstore.opencursor, declaring keyrangevalue as its optional key range value.
... note: for a more complete example allowing you to experiment with key range, have a look at the idbkeyrange directory in the indexeddb-examples repo (view the example live too.) function displaydata() { var keyrangevalue = idbkeyrange.bound("a", "f"); var transaction = db.transaction(['fthings'], 'readonly'); var objectstore = transaction.objectstore('fthings'); objectstore.opencursor(keyrangevalue).onsuccess = function(event) { var cursor = event.target.result; if(cursor) { var listitem = document.createelement('li'); listitem.innerhtml = '<strong>' + cursor.value.fthing + '</...
IDBKeyRange.lower - Web APIs
WebAPIIDBKeyRangelower
here we declare keyrangevalue = idbkeyrange.upperbound("f", "w", true, true); — a range that includes everything between "f" and "w" but not including them — since both the upper and lower bounds have been declared as open (true).
... we open a transaction (using idbtransaction) and an object store, and open a cursor with idbobjectstore.opencursor, declaring keyrangevalue as its optional key range value.
... note: for a more complete example allowing you to experiment with key range, have a look at our idbkeyrange-example repo (view the example live too.) function displaydata() { var keyrangevalue = idbkeyrange.bound("f", "w", true, true); console.log(keyrangevalue.lower); var transaction = db.transaction(['fthings'], 'readonly'); var objectstore = transaction.objectstore('fthings'); objectstore.opencursor(keyrangevalue).onsuccess = function(event) { var cursor = event.target.result; if(cursor) { var listitem = document.createelement('li'); listitem.innerhtml = '<strong>' + cursor.value.fthing + '</strong>, ' + cursor.value.frating; list.app...
IDBKeyRange.lowerBound() - Web APIs
here we declare keyrangevalue = idbkeyrange.lowerbound("f", false); — a range that includes the value "f" and everthing after it.
... we open a transaction (using idbtransaction) and an object store, and open a cursor with idbobjectstore.opencursor, declaring keyrangevalue as its optional key range value.
... note: for a more complete example allowing you to experiment with key range, have a look at our idbkeyrange-example repo (view the example live too.) function displaydata() { var keyrangevalue = idbkeyrange.lowerbound("f"); var transaction = db.transaction(['fthings'], 'readonly'); var objectstore = transaction.objectstore('fthings'); objectstore.opencursor(keyrangevalue).onsuccess = function(event) { var cursor = event.target.result; if(cursor) { var listitem = document.createelement('li'); listitem.innerhtml = '<strong>' + cursor.value.fthing + '</...
IDBKeyRange.lowerOpen - Web APIs
here we declare keyrangevalue = idbkeyrange.upperbound("f", "w", true, true); — a range that includes everything between "f" and "w" but not including them — since both the upper and lower bounds have been declared as open (true).
... we open a transaction (using idbtransaction) and an object store, and open a cursor with idbobjectstore.opencursor, declaring keyrangevalue as its optional key range value.
... note: for a more complete example allowing you to experiment with key range, have a look at our idbkeyrange-example repo (view the example live too.) function displaydata() { var keyrangevalue = idbkeyrange.bound("f", "w", true, true); console.log(keyrangevalue.loweropen); var transaction = db.transaction(['fthings'], 'readonly'); var objectstore = transaction.objectstore('fthings'); objectstore.opencursor(keyrangevalue).onsuccess = function(event) { var cursor = event.target.result; if(cursor) { var listitem = document.createelement('li'); listitem.innerhtml = '<strong>' + curso...
IDBKeyRange.only() - Web APIs
WebAPIIDBKeyRangeonly
here we declare a keyrangevalue = idbkeyrange.only("a"); — a range that only includes the value "a".
... we open a transaction (using idbtransaction) and an object store, and open a cursor with idbobjectstore.opencursor, declaring keyrangevalue as its optional key range value.
... note: for a more complete example allowing you to experiment with key range, have a look at our idbkeyrange repo (view the example live too.) function displaydata() { var keyrangevalue = idbkeyrange.only("a"); var transaction = db.transaction(['fthings'], 'readonly'); var objectstore = transaction.objectstore('fthings'); objectstore.opencursor(keyrangevalue).onsuccess = function(event) { var cursor = event.target.result; if(cursor) { var listitem = document.createelement('li'); listitem.innerhtml = '<strong>' + cursor.value.fthing + '</strong>, ' + cursor.value.frating; list.appendchild(listitem); cursor.continue(); } else { console.log('entri...
IDBKeyRange.upper - Web APIs
WebAPIIDBKeyRangeupper
here we declare keyrangevalue = idbkeyrange.upperbound("f", "w", true, true); — a range that includes everything between "f" and "w" but not including them — since both the upper and lower bounds have been declared as open (true).
... we open a transaction (using idbtransaction) and an object store, and open a cursor with idbobjectstore.opencursor, declaring keyrangevalue as its optional key range value.
... note: for a more complete example allowing you to experiment with key range, have a look at our idbkeyrange-example repo (view the example live too.) function displaydata() { var keyrangevalue = idbkeyrange.bound("f", "w", true, true); console.log(keyrangevalue.upper); var transaction = db.transaction(['fthings'], 'readonly'); var objectstore = transaction.objectstore('fthings'); objectstore.opencursor(keyrangevalue).onsuccess = function(event) { var cursor = event.target.result; if(cursor) { var listitem = document.createelement('li'); listitem.innerhtml = '<strong>' + cursor.value.fthing + '</strong>, ' + cursor.value.frating; list.app...
IDBKeyRange.upperBound() - Web APIs
here we declare keyrangevalue = idbkeyrange.upperbound("f"); — a range that includes the value "f" and everything before it.
... we open a transaction (using idbtransaction) and an object store, and open a cursor with idbobjectstore.opencursor, declaring keyrangevalue as its optional key range value.
... note: for a more complete example allowing you to experiment with key range, have a look at our idbkeyrange-example repo (view the example live too.) function displaydata() { var keyrangevalue = idbkeyrange.upperbound("f"); var transaction = db.transaction(['fthings'], 'readonly'); var objectstore = transaction.objectstore('fthings'); objectstore.opencursor(keyrangevalue).onsuccess = function(event) { var cursor = event.target.result; if(cursor) { var listitem = document.createelement('li'); listitem.innerhtml = '<strong>' + cursor.value.fthing + '</strong>, ' + cursor.value.frating; list.appendchild(listitem); c...
IDBKeyRange.upperOpen - Web APIs
here we declare keyrangevalue = idbkeyrange.upperbound("f", "w", true, true); — a range that includes everything between "f" and "w" but not including them — since both the upper and lower bounds have been declared as open (true).
... we open a transaction (using idbtransaction) and an object store, and open a cursor with idbobjectstore.opencursor, declaring keyrangevalue as its optional key range value.
... note: for a more complete example allowing you to experiment with key range, have a look at our idbkeyrange-example repo (view the example live too.) function displaydata() { var keyrangevalue = idbkeyrange.bound("f", "w", true, true); console.log(keyrangevalue.upperopen); var transaction = db.transaction(['fthings'], 'readonly'); var objectstore = transaction.objectstore('fthings'); objectstore.opencursor(keyrangevalue).onsuccess = function(event) { var cursor = event.target.result; if(cursor) { var listitem = document.createelement('li'); listitem.innerhtml = '<strong>' + curso...
IDBKeyRange - Web APIs
here we declare a keyrangevalue as a range between values of "a" and "f".
... we open a transaction (using idbtransaction) and an object store, and open a cursor with idbobjectstore.opencursor, declaring keyrangevalue as its optional key range value.
... note: for a more complete example allowing you to experiment with key range, have a look at our idbkeyrange-example repo (view the example live too.) function displaydata() { var keyrangevalue = idbkeyrange.bound("a", "f"); var transaction = db.transaction(['fthings'], 'readonly'); var objectstore = transaction.objectstore('fthings'); objectstore.opencursor(keyrangevalue).onsuccess = function(event) { var cursor = event.target.result; if(cursor) { var listitem = document.createelement('li'); listitem.innerhtml = '<strong>' + cursor.value.fthing + '</strong...
SVGAnimatedAngle - Web APIs
interface overview also implement none methods none properties readonly svgangle baseval readonly svgangle animval normative document svg 1.1 (2nd edition) properties name type description baseval svgangle the base value of the given attribute before applying any animations.
...if the given attribute is not currently being animated, then the svgangle will have the same contents as baseval.
... the object referenced by animval will always be distinct from the one referenced by baseval, even when the attribute is not animated.
SVGAnimatedLengthList - Web APIs
interface overview also implement none methods none properties readonly svglengthlist baseval readonly svglengthlist animval normative document svg 1.1 (2nd edition) properties name type description baseval svglengthlist the base value of the given attribute before applying any animations.
...if the given attribute is not currently being animated, then the svglengthlist will have the same contents as baseval.
... the object referenced by animval will always be distinct from the one referenced by baseval, even when the attribute is not animated.
SVGAnimatedNumberList - Web APIs
interface overview also implement none methods none properties readonly svgnumberlist baseval readonly svgnumberlist animval normative document svg 1.1 (2nd edition) properties svganimatednumberlist.baseval read only is a svgnumberlist that represents the base value of the given attribute before applying any animations.
...if the given attribute is not currently being animated, then the svgnumberlist will have the same contents as baseval.
... the object referenced by animval will always be distinct from the one referenced by baseval, even when the attribute is not animated.
SVGAnimatedPreserveAspectRatio - Web APIs
interface overview also implement none methods none properties readonly float baseval readonly float animval normative document svg 1.1 (2nd edition) properties svganimatedpreserveaspectratio.baseval read only is a svgpreserveaspectratio that represents the base value of the given attribute before applying any animations.
...if the given attribute is not currently being animated, then the svgpreserveaspectratio will have the same contents as baseval.
... the object referenced by animval is always distinct from the one referenced by baseval, even when the attribute is not animated.
SVGAnimatedRect - Web APIs
interface overview also implement none methods none properties readonly svgrect baseval readonly svgrect animval normative document svg 1.1 (2nd edition) properties name type description baseval svgrect the base value of the given attribute before applying any animations.
...if the given attribute is not currently being animated, then the svgrect will have the same contents as baseval.
... the object referenced by animval will always be distinct from the one referenced by baseval, even when the attribute is not animated.
SVGAnimatedString.animVal - Web APIs
animval attribute or animval property contains the same value as the baseval property.if the given attribute or property is being animated, contains the current animated value of the attribute or property.
... if the given attribute or property is not currently being animated, then it contains the same value as baseval the animval property is a read only property.
...as a result, the animval property contains the same value as the baseval property.
SVGAnimatedString - Web APIs
if the given attribute or property is not currently being animated, it contains the same value as baseval.
... svganimatedstring.baseval this is a domstring representing the base value.
... yeschrome android no support nofirefox android full support yesopera android full support yessafari ios full support yessamsung internet android no support nobasevalchrome full support yesedge full support 12firefox full support yesie no support noopera full support yessafari full support yeswe...
SVGAnimatedTransformList - Web APIs
interface overview also implement none methods none properties readonly svgtransformlist baseval readonly svgtransformlist animval normative document svg 1.1 (2nd edition) properties name type description baseval svgtransformlist the base value of the given attribute before applying any animations.
...if the given attribute is not currently being animated, then the svgtransformlist will have the same contents as baseval.
... the object referenced by animval will always be distinct from the one referenced by baseval, even when the attribute is not animated.
StylePropertyMapReadOnly.getAll() - Web APIs
the getall() method of the stylepropertymapreadonly interface returns an array of cssstylevalue objects containing the values for the provided property.
... syntax var cssstylevalues[] = stylepropertymapreadonly.getall(property) parameters property the name of the property to retrieve all values of.
... return value an array of cssstylevalue objects.
Text.isElementContentWhitespace - Web APIs
note: you may simply replace it with /\s+/.test(text.data), /\s+/.test(text.nodevalue), or /\s+/.test(text.textcontent).
... var tn = document.createtextnode("hello world"); tn.iselementcontentwhitespace; /* evaluates to false */ for a node that is all whitespace characters, the iselementcontentwhitespace evaluates to true.
... var ws = document.createtextnode(" \t \r\n ") ws.iselementcontentwhitespace; /* evaluates to true */ ...
XPathResult - Web APIs
the xpathresult interface represents the results generated by evaluating an xpath expression within the context of a given node.
... xpathresult.singlenodevalueread only a node representing the value of the single node result, which may be null.
... constants result type defined constant value description any_type 0 a result set containing whatever type naturally results from evaluation of the expression.
Web APIs
WebAPI
tooth bluetoothadvertisingdata bluetoothcharacteristicproperties bluetoothdevice bluetoothremotegattcharacteristic bluetoothremotegattdescriptor bluetoothremotegattserver bluetoothremotegattservice body broadcastchannel budgetservice budgetstate buffersource bytelengthqueuingstrategy bytestring c cdatasection css cssconditionrule csscounterstylerule cssgroupingrule cssimagevalue csskeyframerule csskeyframesrule csskeywordvalue cssmathproduct cssmathsum cssmathvalue cssmediarule cssnamespacerule cssnumericvalue cssomstring csspagerule csspositionvalue cssprimitivevalue csspseudoelement cssrule cssrulelist cssstyledeclaration cssstylerule cssstylesheet cssstylevalue csssupportsrule cssunitvalue cssunparsedvalue cssvalue cssvaluelist cssvar...
...iablereferencevalue cache cachestorage canvascapturemediastreamtrack canvasgradient canvasimagesource canvaspattern canvasrenderingcontext2d caretposition channelmergernode channelsplitternode characterdata childnode client clients clipboard clipboardevent clipboarditem closeevent comment compositionevent constantsourcenode constrainboolean constraindomstring constraindouble constrainulong contentindex contentindexevent convolvernode countqueuingstrategy crashreportbody credential credentialscontainer crypto cryptokey cryptokeypair customelementregistry customevent d domconfiguration domerror domexception domhighrestimestamp domimplementation domimplementationlist domlocator dommatrix dommatrixreadonly domobject domparser dompoint dompointinit dompointr...
...ation webglvertexarrayobject webkitcssmatrix websocket wheelevent window windowclient windoweventhandlers windoworworkerglobalscope worker workerglobalscope workerlocation workernavigator worklet writablestream writablestreamdefaultcontroller writablestreamdefaultwriter x xdomainrequest xmldocument xmlhttprequest xmlhttprequesteventtarget xmlhttprequestresponsetype xmlserializer xpathevaluator xpathexception xpathexpression xpathnsresolver xpathresult xrboundedreferencespace xrenvironmentblendmode xreye xrframe xrframerequestcallback xrhandedness xrinputsource xrinputsourcearray xrinputsourceevent xrinputsourceeventinit xrinputsourceschangeevent xrinputsourceschangeeventinit xrpermissiondescriptor xrpermissionstatus xrpose xrreferencespace xrreferencespaceevent xrreferencespacee...
Border-image generator - CSS: Cascading Style Sheets
'; while (node.firstelementchild !== null) { option = node.firstelementchild; option_value = option.getattribute('data-value'); if (option_value === null) option.setattribute('data-value', uval); list.appendchild(node.firstelementchild); uval++; } node.appendchild(select); node.appendchild(list); select.onclick = this.toggle.bind(this); list.onclick = this.updatevalue.bind(this); document.addeventlistener('click', clickout); this.state = 0; this.time = 0; this.dropmenu = list; this.select = select; this.toggle(false); this.value = {}; this.topic = topic; if (label) select.textcontent = label; else this.setnodevalue(list.children[selected]); dropdowns[topic] = this; }; dropdown.prototype.toggle = function toggle(state) { i...
...if (active) active.toggle(false); active = this; } if (this.state === 0) this.dropmenu.setattribute('data-hidden', 'true'); else this.dropmenu.removeattribute('data-hidden'); }; var clickout = function clickout(e) { if (active.state === 0 || e.target === active.dropmenu || e.target === active.select) return; active.toggle(false); }; dropdown.prototype.updatevalue = function updatevalue(e) { if (date.now() - this.time < 500) return; if (e.target.classname !== "ui-dropdown-list") { this.setnodevalue(e.target); this.toggle(false); } this.time = date.now(); }; dropdown.prototype.setnodevalue = function setnodevalue(node) { this.value['name'] = node.textcontent; this.value['value'] = node.getattribute('data-value'); this.select.
...for (var i in options) { var x = document.createelement('div'); x.setattribute('data-value', i); x.textcontent = options[i]; dropdown.appendchild(x); } new dropdown(dropdown); return dropdown; }; var setvalue = function setvalue(topic, index) { if (dropdowns[topic] === undefined || index >= dropdowns[topic].dropmenu.children.length) return; dropdowns[topic].setnodevalue(dropdowns[topic].dropmenu.children[index]); }; var subscribe = function subscribe(topic, callback) { if (subscribers[topic] === undefined) subscribers[topic] = []; subscribers[topic].push(callback); }; var unsubscribe = function unsubscribe(topic, callback) { var index = subscribers[topic].indexof(callback); subscribers[topic].splice(index, 1); }; var notify = function notif...
Using media queries - CSS: Cascading Style Sheets
the not is evaluated last in the following query: @media not all and (monochrome) { ...
...so that the above query is evaluated like this: @media not (all and (monochrome)) { ...
...is evaluated like this: @media (not (screen and (color))), print and (color) { ...
filter - CSS: Cascading Style Sheets
WebCSSfilter
2" xlink:href="/files/8467/test_form_4_irregular-shape_opacity-gradient.png" width="213px" height="161px"/> </defs> <filter id="drop-shadow2" x="-50%" y="-50%" width="200%" height="200%"> <feoffset dx="5" dy="5.5" in="sourcealpha"/> <fegaussianblur stddeviation="2.5"/> <fecomponenttransfer> <fefunca type="table" tablevalues="0 0.8"/> </fecomponenttransfer> </filter> <use xlink:href="#myimage2" filter="url(#drop-shadow2)"/> <use xlink:href="#myimage2"/> </svg> </div> </td> <td><img alt="test_form_4 distorded border drop shadow - static example" id="img14" class="internal default" src="/files/8469/test_form_4_irregular-shape_opacity-gra...
...7.jpeg" style="width: 100%;" /></td> <td><img alt="test_form_7.jpg" id="img2" class="internal default" src="/files/3720/test_form_7.jpeg" style="width: 100%;" /></td> <td><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" id="img3" viewbox="0 0 183 276" color-interpolation-filters="srgb"> <filter id="invert"> <fecomponenttransfer> <fefuncr type="table" tablevalues="1 0"/> <fefuncg type="table" tablevalues="1 0"/> <fefuncb type="table" tablevalues="1 0"/> </fecomponenttransfer> </filter> <image xlink:href="/files/3720/test_form_7.jpeg" filter="url(#invert)" width="183px" height="276px" /> </svg><div></td> <td><img alt="test_form_7_s.jpg" id="img4" class="internal default" src="/files/3721/test_form_7_s.jpg" style="width: 100%;...
...peg" style="width: 100%;" /></td> <td><img alt="test_form_14.jpg" id="img2" class="internal default" src="/files/3725/test_form_14.jpeg" style="width: 100%;" /></td> <td><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" id="img3" viewbox="0 0 276 183" color-interpolation-filters="srgb"> <filter id="opacity"> <fecomponenttransfer> <fefunca type="table" tablevalues="0 0.5"> </fecomponenttransfer> </filter> <image xlink:href="/files/3725/test_form_14.jpeg" filter="url(#opacity)" width="276px" height="183px" /> </svg><div></td> <td><img alt="test_form_14_s.jpg" id="img4" class="internal default" src="/files/3726/test_form_14_s.jpg" style="width: 100%;" /></td> </tr> </tbody> </table> html { height:100%; } body { font: 14px/1.286 "lu...
HTML attribute: rel - HTML: Hypertext Markup Language
WebHTMLAttributesrel
link link link manifest web app manifest link not allowed not allowed modulepreload tells to browser to preemptively fetch the script and store it in the document's module map for later evaluation.
... modulepreload useful for improved performance, and relevant to the <link> anywhere in the document, setting rel="modulepreload" tells the browser to preemptively fetch the script (and dependencies) and store it in the document's module map for later evaluation.
... modulepreload links can ensure network fetching is done with the module ready (but not evaluated) in the module map before it is necessarily needed.
CSP: script-src - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
... <script>var inline = 1;</script> unsafe eval expressions the 'unsafe-eval' source expression controls several script execution methods that create code from strings.
... if 'unsafe-eval' isn't specified with the script-src directive, the following methods are blocked and won't have any effect: eval() function() when passing a string literal like to methods like: window.settimeout("alert(\"hello world!\");", 500); window.settimeout window.setinterval window.setimmediate window.execscript (ie < 11 only) strict-dynamic the 'strict-dynamic' source expression specifies that the trust explicitly given to a script present in the markup, by accompanying it with a nonce or a hash, shall be propagated to all the scripts loaded by that root script.
CSP: style-src - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
... <style>#inline-style { background: red; }</style> unsafe style expressions the 'unsafe-eval' source expression controls several style methods that create style declarations from strings.
... if 'unsafe-eval' isn't specified with the style-src directive, the following methods are blocked and won't have any effect: cssstylesheet.insertrule() cssgroupingrule.insertrule() cssstyledeclaration.csstext specifications specification status comment content security policy level 3the definition of 'style-src' in that specification.
Public class fields - JavaScript
they are added to the class constructor at the time of class evaluation using object.defineproperty().
... class classwithstaticmethod { static staticmethod() { return 'static method has been called.'; } } console.log(classwithstaticmethod.staticmethod()); // expected output: "static method has been called." the static methods are added to the class constructor with object.defineproperty() at class evaluation time.
... class classwithpublicinstancemethod { publicmethod() { return 'hello world' } } const instance = new classwithpublicinstancemethod() console.log(instance.publicmethod()) // expected output: "hello worl​d" public instance methods are added to the class prototype at the time of class evaluation using object.defineproperty().
Boolean - JavaScript
any object of which the value is not undefined or null, including a boolean object whose value is false, evaluates to true when passed to a conditional statement.
... for example, the condition in the following if statement evaluates to true: var x = new boolean(false); if (x) { // this code is executed } this behavior does not apply to boolean primitives.
... for example, the condition in the following if statement evaluates to false: var x = false; if (x) { // this code is not executed } do not use a boolean object to convert a non-boolean value to a boolean value.
Function() constructor - JavaScript
calling the constructor directly can create functions dynamically, but suffers from security and similar (but far less significant) performance issues to eval.
... however, unlike eval, the function constructor creates functions which execute in the global scope only.
...for example: "x", "thevalue"—or "x,thevalue".
Function - JavaScript
calling the constructor directly can create functions dynamically but suffers from security and similar (but far less significant) performance issues to eval.
... however, unlike eval, the function constructor creates functions that execute in the global scope only.
...this is different from using eval with code for a function expression.
GeneratorFunction - JavaScript
it could be obtained by evaluating the following code.
...each must be a string that corresponds to a valid javascript identifier or a list of such strings separated with a comma; for example "x", "thevalue", or "a,b".
... this is different from using eval with code for a generator function expression.
JSON.parse() - JavaScript
if that is so, then the text is safe for eval.
... if ( rx_one.test( text .replace(rx_two, "@") .replace(rx_three, "]") .replace(rx_four, "") ) ) { // in the third stage we use the eval function to compile the text into a // javascript structure.
... j = eval("(" + text + ")"); // in the optional fourth stage, we recursively walk the new structure, passing // each name/value pair to a reviver function for possible transformation.
undefined - JavaScript
a method or statement also returns undefined if the variable that is being evaluated does not have an assigned value.
...in the following code, the variable x is not initialized, and the if statement evaluates to true.
... // x has not been declared before if (typeof x === 'undefined') { // evaluates to true without errors // these statements execute } if (x === undefined) { // throws a referenceerror } however, there is another alternative.
Logical AND (&&) - JavaScript
short-circuit evaluation the logical and expression is evaluated left to right, it is tested for possible "short-circuit" evaluation using the following rule: (some falsy expression) && expr is short-circuit evaluated to the falsy expression; short circuit means that the expr part above is not evaluated, hence any side effects of doing so do not take effect (e.g., if expr is a function call, the calling never ta...
...this happens because the value of the operator is already determined after the evaluation of the first operand.
...returns false conversion rules for booleans converting and to or the following operation involving booleans: bcondition1 && bcondition2 is always equal to: !(!bcondition1 || !bcondition2) converting or to and the following operation involving booleans: bcondition1 || bcondition2 is always equal to: !(!bcondition1 && !bcondition2) removing nested parentheses as logical expressions are evaluated left to right, it is always possible to remove parentheses from a complex expression following some rules.
Logical nullish assignment (??=) - JavaScript
syntax expr1 ??= expr2 description short-circuit evaluation the nullish coalescing operator is evaluated left to right, it is tested for possible short-circuit evaluation using the following rule: (some expression that is neither null nor undefined) ??
... expr is short-circuit evaluated to the left-hand side expression if the left-hand side proves to be neither null nor undefined.
... short circuit means that the expr part above is not evaluated, hence any side effects of doing so do not take effect (e.g., if expr is a function call, the calling never takes place).
void operator - JavaScript
the void operator evaluates the given expression and then returns undefined.
... syntax void expression description this operator allows evaluating expressions that produce a value into places where an expression that evaluates to undefined is desired.
... javascript uris when a browser follows a javascript: uri, it evaluates the code in the uri and then replaces the contents of the page with the returned value, unless the returned value is undefined.
async function - JavaScript
progress continues, and the second await expression is evaluated.
... return await promisevalue vs.
... return promisevalue the implicit wrapping of return values in promise.resolve does not imply that return await promisevalue is functionally equivalent to return promisevalue.
let - JavaScript
the other difference between var and let is that the latter is initialized to a value only when a parser evaluates it (see below).
... let x = 1; switch(x) { case 0: { let foo; break; } case 1: { let foo; break; } } temporal dead zone unlike variables declared with var, which will start with the value undefined, let variables are not initialized until their definition is evaluated.
...ypeof operator to check for the type of a variable in that variable's temporal dead zone will throw a referenceerror: // prints out 'undefined' console.log(typeof undeclaredvariable); // results in a 'referenceerror' console.log(typeof i); let i = 10; another example of temporal dead zone combined with lexical scoping due to lexical scoping, the identifier foo inside the expression (foo + 55) evaluates to the if block's foo, and not the overlying variable foo with the value of 33.
requiredExtensions - SVG: Scalable Vector Graphics
if all of the given extensions are supported, then the attribute evaluates to true; otherwise, the current element and its children are skipped and thus will not be rendered.
... if the attribute is not present, then it implicitly evaluates to "true".
... if a null string or empty string value is given, the attribute evaluates to "false".
requiredFeatures - SVG: Scalable Vector Graphics
it determines whether or not all of the named features are supported by the browser; if all of them are supported, the attribute evaluates to true end the element is rendered; otherwise, the attribute evaluates to false and the current element and its children are skipped and thus will not be rendered.
... if the attribute is not present, then its implicit evaluated value is true.
... if a null string or empty string value is given to attribute requiredfeatures, the attribute is evaluate to false.
SVG documentation index - SVG: Scalable Vector Graphics
WebSVGIndex
it determines whether or not all of the named features are supported by the browser; if all of them are supported, the attribute evaluates to true end the element is rendered; otherwise, the attribute evaluates to false and the current element and its children are skipped and thus will not be rendered.
... 214 tablevalues svg, svg attribute the tablevalues attribute defines a list of numbers defining a lookup table of values for a for a color component transfer function.
... 369 <switch> element, needsexample, svg, svg container the <switch> svg element evaluates any requiredfeatures, requiredextensions and systemlanguage attributes on its direct child elements in order, and then renders the first child where these attributes evaluate to true.
not - XPath
WebXPathFunctionsnot
xslt/xpath reference: xslt elements, exslt functions, xpath functions, xpath axes the not function evaluates a boolean expression and returns the opposite value.
... syntax not(expression ) arguments expression the expression is evaluated exactly as if it were passed as an argument to the boolean() function.
... returns true for an expression that evaluates to false; false for an expression that evaluates to true.
test/assert - Archive of obsolete content
methods ok(guard, message) tests whether an expression evaluates to true.
... assert.ok(a == 1, "test that a is equal to one"); this is equivalent to: assert.equal(a == 1, true, "test that a is equal to one"); parameters guard : expression the expression to evaluate.
XPath - Archive of obsolete content
notes and sample code for xpath and ajax (the following was moved from document.evaluate) obj.evaluate(xpathexpression,contextnode,namespaceresolver,resulttype,result); //obj and contextnode should be the same object, if context is a ajax xml object (example: returnedxml) this should be used as : returnedxml.evaluate(xpathexpression,returnedxml,namespaceresolver,returntype,result); //contextnode should be used in the one in which it was created //add by mooring 2008-11-15 16:00 china var xhr = new ajax('post','demo.xml',parsexml,'xml'); //ajax is a class written by javascript which return responsexml object to parsexml function function parsexml(obj)//obj is the returnxml object now { if(!obj.documentelement) { alert("your browser does't support this script!"); return;...
... } var fields = [];//store the results if(window.activexobject) { var tobj = obj.documentelement.selectnodes("/root/field/item"); for(var i=0;i<tobj.length; i++) { fields.push(tobj[i].text); } } else { var tobj = obj.evaluate("/root/field/item",obj.documentelement,null, xpathresult.any_type, null); var tmp = tobj.iteratenext(); while(tmp) { fields.push(tmp.textcontent); tmp = tobj.iteratenext(); } } alert(fields); } //here is the demo xml file for xpath <?xml version="1.0"?> <root> <field> <item>art_id</item> <item>psection</item> <item>qkind</item> <item>qtitle</item> <item>question</item> <item>pic</item> <item>answer1</item> <item>answer2</item> <item>answer3</item> <item>answer4</item> </field> </root> //add by mooring 2008...
Interaction between privileged and non-privileged pages - Archive of obsolete content
t> var something = { send_request: function(data, callback) { // analogue of chrome.extension.sendrequest var request = document.createtextnode(json.stringify(data)); request.addeventlistener("something-response", function(event) { request.parentnode.removechild(request); if (callback) { var response = json.parse(request.nodevalue); callback(response); } }, false); document.head.appendchild(request); var event = document.createevent("htmlevents"); event.initevent("something-query", true, false); request.dispatchevent(event); }, callback: function(response) { return alert("response: " + (response ?
.../html> overlay on browser.xul in your extension: var something = { listen_request: function(callback) { // analogue of chrome.extension.onrequest.addlistener document.addeventlistener("something-query", function(event) { var node = event.target; if (!node || node.nodetype != node.text_node) return; var doc = node.ownerdocument; callback(json.parse(node.nodevalue), doc, function(response) { node.nodevalue = json.stringify(response); var event = doc.createevent("htmlevents"); event.initevent("something-response", true, false); return node.dispatchevent(event); }); }, false, true); }, callback: function(request, sender, callback) { if (request.foo) { return settimeout(function() { callback({b...
Jetpack Processes - Archive of obsolete content
privileged apis when script is evaluated in a jetpack process via a call to nsijetpack.evalscript(), the script's global scope is endowed with the following privileged apis: sendmessage(amessagename [, v1 [, v2 [, ...]]]) similar to nsijetpack.sendmessage(), this function asynchronously sends a message to the chrome process.
...evalinsandbox(asandbox, ascript) evaluates the given script contents in the given sandbox's global scope.
Chapter 2: Technologies used in developing extensions - Archive of obsolete content
listing 1: xml syntax <elementname someattribute="somevalue"> content </elementname> as shown in listing 1, xml uses elements, which consist of an opening tag, a closing tag, and content.
... nevertheless, the rise of web services like google maps, which used javascript and asynchronous communications, created an awareness of a set of technologies nicknamed ajax (asynchronous javascript and xml); that plus the advent of a number of libraries that paper over implementation differences between different web browsers has more recently led to a re-evaluation of javascript as a programming language.
Adding windows and dialogs - Archive of obsolete content
let somevalue = 2; let returnvalue = { accepted : false , result : "" }; window.opendialog( "chrome://xulschoolhello/content/somedialog.xul", "xulschoolhello-some-dialog", "chrome,centerscreen", somevalue, returnvalue); // you can send as many extra parameters as you need.
... // if (returnvalue.accepted) { do stuff } the optional parameters are available in the dialog code through the window.arguments property: let somevalue = window.arguments[0]; let returnvalue = window.arguments[1]; // returnvalue.accepted = true; // returnvalue.result = "something"; the parameter named returnvalue is an object that the dialog will modify to reflect what the user did in it.
Index of archived content - Archive of obsolete content
xul school tutorial adding events and commands adding toolbars and toolbar buttons adding menus and submenus adding sidebars adding windows and dialogs appendix a: add-on performance appendix b: install and uninstall scripts appendix c: avoiding using eval in add-ons appendix d: loading scripts appendix e: dom building and insertion (html & xul) appendix f: monitoring dom changes connecting to remote content custom xul elements with xbl getting started with firefox extensions handling preferences intercepting page loads intr...
... browser-side plug-in api npapi plug-in side api npanycallbackstruct npbyterange npclass npembedprint npevent npfullprint npidentifier npn newstream npnvariable npn_createobject npn_destroystream npn_enumerate npn_evaluate npn_forceredraw npn_getauthenticationinfo npn_getintidentifier npn_getproperty npn_getstringidentifier npn_getstringidentifiers npn_geturl npn_geturlnotify npn_getvalue npn_getvalueforurl npn_hasmethod npn_hasproperty npn_identifierisstrin...
Inner-browsing extending the browser navigation paradigm - Archive of obsolete content
articletitle=article.getelementsbytagname("article").item(0).firstchild.nodevalue; // inserting the content into the container..
...(doc!=null) { tagname="article"; // ie fix if(document.all) tagname="nde:"+tagname; articles=doc.getelementsbytagname(tagname); for(i=0;i<articles.length;i++) { article=articles.item(i); tagname="title"; // ie fix if(document.all) tagname="nde:"+tagname; valuee=article.getelementsbytagname(tagname).item(0).firstchild.nodevalue; tagname="summary"; // ie fix if(document.all) tagname="nde:"+tagname; paraa=article.getelementsbytagname(tagname).item(0).firstchild.nodevalue; linkk=article.getattribute("url"); strvalue="<div class='nde-blurb'><h3><a href='"+linkk+"'>"+valuee+"</a></h3><p>"+paraa+"</p></div>"; document.getelementbyid("containe...
Editor Embedding Guide - Archive of obsolete content
setbooleanvalue setlongvalue setdoublevalue setstringvalue setcstringvalue setisupportsvalue removevalue each will take a name value pair.
... first getnext (returns the next name in the name/value pair list) hasmoreelements getvaluetype (numeric enum type see nsicommandparams for values) if the name/value pair is known or it was obtained using the methods described above, it is possible to call the following methods: getbooleanvalue getlongvalue getdoublevalue getstringvalue getcstringvalue getisupportsvalue all of these take pointers to values except for getstringvalue which demands a reference to an nsastring.
Using Breakpoints in Venkman - Archive of obsolete content
the result of the evaluation will be logged to the interactive session.
... the //@jsd_eval command will insert a breakpoint which is set to execute the script that follows without stopping and without logging the result.
Binding Implementations - Archive of obsolete content
the script is evaluated at the time of binding attachment and the resulting value is stored on the element.
...for example, a binding could override the setattribute method on element or the retrieval of the value property for an htmlinputelement.
Index - Archive of obsolete content
ArchiveMozillaXULIndex
678 datevalue xul properties, xul reference no summary!
...when evaluating the rule for a particular rdf resource, the variables are replaced with values from the resource.
uri - Archive of obsolete content
ArchiveMozillaXULPropertyuri
when a rule is evaluated, it scans through each resource in the rdf datasource looking for a match.
...then, the other rules are evaluated for a match.
Property - Archive of obsolete content
letedefaultindex container contentdocument contentprincipal contenttitle contentview contentvieweredit contentviewerfile contentwindow contextmenu control controller controllers crop current currentindex currentitem currentnotification currentpage currentpane currentset currenturi customtoolbarcount database datasources date dateleadingzero datevalue decimalplaces decimalsymbol defaultbutton defaultvalue description dir disableautocomplete disableautocomplete disableautoselect disabled disablekeynavigation dlgtype docshell documentcharsetinfo editable editingcolumn editingrow editingsession editor editortype emptytext deprecated since gecko 2 enablecolumndrag eventnode firstordinalcolumn fi...
...nt.clientheight dom:element.clientleft dom:element.clienttop dom:element.clientwidth dom:element.clonenode dom:element.firstchild dom:element.firstelementchild dom:element.lastchild dom:element.lastelementchild dom:element.localname dom:element.namespaceuri dom:element.nextelementsibling dom:element.nextsibling dom:element.nodename dom:element.nodetype dom:element.nodevalue dom:element.ownerdocument dom:element.parentnode dom:element.prefix dom:element.previouselementsibling dom:element.previoussibling dom:element.scrollheight dom:element.scrollleft dom:element.scrolltop dom:element.scrollwidth dom:element.tagname dom:element.textcontent ...
Simple Example - Archive of obsolete content
the data network will now look like this: (?start = http://www.xulplanet.com/rdf/myphotos, ?photo = http://www.xulplanet.com/ndeakin/images/t/palace.jpg) (?start = http://www.xulplanet.com/rdf/myphotos, ?photo = http://www.xulplanet.com/ndeakin/images/t/canal.jpg) (?start = http://www.xulplanet.com/rdf/myphotos, ?photo = http://www.xulplanet.com/ndeakin/images/t/obselisk.jpg) the triple is evaluated next, and it will be examined for each potential result found so far.
...for the first result, the value of the ?photo variable is known, so the triple will be evaluated like so: <triple subject="http://www.xulplanet.com/ndeakin/images/t/palace.jpg" predicate="http://purl.org/dc/elements/1.1/title" object="?title"/> the builder next calculates the value for ?title using the predicate 'http://purl.org/dc/elements/1.1/title'.
Simple Query Syntax - Archive of obsolete content
first, it evaluates the default query as above, except that no variables are used, or at least, not ones that are used externally.
...after the default query statements are evaluated, the data network will look something like this: (?1 = http://www.xulplanet.com/rdf/myphotos, ?2 = http://www.xulplanet.com/ndeakin/images/t/palace.jpg) (?1 = http://www.xulplanet.com/rdf/myphotos, ?2 = http://www.xulplanet.com/ndeakin/images/t/canal.jpg) (?1 = http://www.xulplanet.com/rdf/myphotos, ?2 = http://www.xulplanet.com/ndeakin/images/t/obselisk.jpg) the numbers are used here for the variable names, but they are really just randomly generated so you can't refer to them in any way.
content - Archive of obsolete content
when a rule is evaluated, it scans through each resource in the rdf datasource looking for a match.
...then, the other rules are evaluated for a match.
Vulnerabilities - Archive of obsolete content
an example is an input validation error, such as user-provided input not being properly evaluated for malicious character strings and overly long values associated with known attacks.
... however, trust assumptions are often implicit, such as creating a feature without first evaluating the risks it would introduce.
Using SSH to connect to CVS - Archive of obsolete content
posix shell eval `ssh-agent -s` ssh-add ~/.ssh/id_dsa $shell ssh-agent -k exit x windows in "~/.xinitrc" add "ssh-add".
...first ssh-agent is called and its output is evaluated in the current environment.
Processing XML with E4X - Archive of obsolete content
variables and expressions can be used to create attribute values by simply wrapping them with braces ({}) and omitting quotation marks that would normally go around an attribute value, as the following example illustrates: var a = 2; var b = <foo bar={a}>"hi"</foo>; upon execution the variable is evaluated and quotes are automatically added where appropriate.
...these filter operations are specified using an expression contained in parentheses: var html = <html> <p id="p1">first paragraph</p> <p id="p2">second paragraph</p> </html>; alert(html.p.(@id == "p1")); // alerts "first paragraph" nodes matching the path before the expression (in this case the paragraph elements) are added to the scope chain before the expression is evaluated, as if they had been specified using the with statement.
String.prototype.quote() - Archive of obsolete content
also note the third column where a wrapped eval() evaluates the escape sequences again.
... str str.quote() eval(str.quote()) hello world!
Archived JavaScript Reference - Archive of obsolete content
oft browsers (internet explorer, and in a few cases, microsoft edge) support a number of special microsoft extensions to the otherwise standard javascript apis.new in javascriptthis chapter contains information about javascript's version history and implementation status for mozilla/spidermonkey-based javascript applications, such as firefox.number.tointeger()the number.tointeger() method used to evaluate the passed value and convert it to an integer, but its implementation has been removed.object.getnotifier()the object.getnotifer() method was used to create an object that allows to synthetically trigger a change, but has been deprecated and removed in browsers.object.observe()the object.observe() method was used for asynchronously observing the changes to an object.
... count of enumerable properties on the object, but it has been removed.object.prototype.__nosuchmethod__the __nosuchmethod__ property used to reference a function to be executed when a non-existent method is called on an object, but this function is no longer available.object.prototype.__parent__the __parent__ property used to point to an object's context, but it has been removed.object.prototype.eval()the object.eval() method used to evaluate a string of javascript code in the context of an object, however, this method has been removed.object.prototype.unwatch()the unwatch() method removes a watchpoint set with the watch() method.object.prototype.watch()the watch() method watches for a property to be assigned a value and runs a function when that occurs.object.unobserve()the object.unobserve(...
Reference - Archive of obsolete content
the reason object instanceof function evaluates to true is because object can be used as a constructor function.
...this is why math instanceof object evaluates to true, but math instanceof function does not.
XInclude - MDN Web Docs Glossary: Definitions of Web-related terms
us === 0) && request[responsetype] !== null) { response = request[responsetype]; if (responsetype === 'responsexml') { // apply xpointer (only xpath1() subset is supported) var responsenodes; if (xpointer) { var xpathresult = response.evaluate( xpointer, response, null, xpathresult.ordered_node_snapshot_type, nul...
...ponse as text var textnode = docu.createtextnode(response); xincludeparent.replacechild(textnode, xinclude); } // replace xinclude in doc with response now (as plain text or xml) } } } catch (e) { // use xi:fallback if xinclude retrieval above failed var xifallbackchildren = xifallback.childnodes; // prepend any node(s) then remove xinclude for (j=0; j < xifallbackchildren.length ; j++) { xincludeparent.insertbefore(xifallbackchildren[j], xinclude); } xincludeparent.removechild(xinclude); } } } return do...
Cascade and inheritance - Learn web development
a more accurate way to evaluate specificity would be to score the specificity levels individually starting from highest and moving on to lowest when necessary.
... only when there is a tie between selector scores within a specificity level do you need to evaluate the next level down; otherwise, you can disregard the lower specificity level selectors since they can never overwrite the higher specificity levels.
Client-side storage - Learn web development
if it has been stored, this call will evaluate to true; if not, it will be false.
... if each video is found in the database (easily checked by seeing whether request.result evaluates to true — if the record is not present, it will be undefined), its video files (stored as blobs) and the video name are passed straight to the displayvideo() function to place them in the ui.
Arrays - Learn web development
</textarea> <div class="playable-buttons"> <input id="reset" type="button" value="reset"> <input id="solution" type="button" value="show solution"> </div> const textarea = document.getelementbyid('code'); const reset = document.getelementbyid('reset'); const solution = document.getelementbyid('solution'); let code = textarea.value; let userentry = textarea.value; function updatecode() { eval(textarea.value); } reset.addeventlistener('click', function() { textarea.value = code; userentry = textarea.value; solutionentry = jssolution; solution.value = 'show solution'; updatecode(); }); solution.addeventlistener('click', function() { if(solution.value === 'show solution') { textarea.value = solutionentry; solution.value = 'hide solution'; } else { textarea.val...
...h2 { font-size: 16px; } .a11y-label { margin: 0; text-align: right; font-size: 0.7rem; width: 98%; } body { margin: 10px; background: #f5f9fa; } const textarea = document.getelementbyid('code'); const reset = document.getelementbyid('reset'); const solution = document.getelementbyid('solution'); let code = textarea.value; let userentry = textarea.value; function updatecode() { eval(textarea.value); } reset.addeventlistener('click', function() { textarea.value = code; userentry = textarea.value; solutionentry = jssolution; solution.value = 'show solution'; updatecode(); }); solution.addeventlistener('click', function() { if(solution.value === 'show solution') { textarea.value = solutionentry; solution.value = 'hide solution'; } else { textarea.val...
Accessibility and Mozilla
since this is a worldwide effort, there is always a good chance to find someone to chat with there, day or night.information for governments and other organizations evaluating mozillainformation for usersfirefox 2 now has help topics (from the menubar: ?
...here is a rundown of problems and the planned solutions:mozilla's section 508 compliancemozilla’s uaag evaluation reportthe uaag document contains a very rich set of accessibility guidelines, that broadly define how accessibility should be implemented by any user agent, i.e.
Performance
and since frame scripts get evaluated for each tab this means new function objects get instantiated, new constants get computed, block scopes must be set up etc.
... as long as it the action does not happen frequently the memory and startup savings should outstrip the added cost of script evaluation.
Release phase
only new l10n work is evaluated.
... release revisions are evaluated, not entire l10n repos.
Localization technical reviews
technical review evaluation criteria in principal, a technical review's criteria looks for localization issues common to localizing software but within the mozilla context.
...that being the case, there are some criteria in a technical review that will only ever be considered once, as all reviews after this only evaluate the changes you're adding on top of this revision from release to release.
PLHashComparator
pl_comparevalues compares the values of the arguments v1 and v2 numerically.
... see also pl_comparestrings, pl_comparevalues ...
PR_ASSERT
syntax #include <prlog.h> void pr_assert ( expression ); parameters the macro has this parameter: expression any valid c language expression that evaluates to true or false.
... returns nothing description this macro evaluates the specified expression.
Certificate functions
er cert_certlistfromcert mxr 3.2 and later cert_certtimesvalid mxr 3.2 and later cert_changecerttrust mxr 3.2 and later cert_checkcertvalidtimes mxr 3.2 and later cert_checknamespace mxr 3.12 and later cert_checkcertusage mxr 3.3 and later cert_comparename mxr 3.2 and later cert_comparevaliditytimes mxr 3.11 and later cert_completecrldecodeentries mxr 3.6 and later cert_convertanddecodecertificate mxr 3.9.3 and later cert_copyname mxr 3.4 and later cert_copyrdn mxr 3.5 and later cert_createava mxr 3.2.1 and later cert_createcertificate mxr 3.5 and later cert_createcertificatereq...
...uest mxr 3.2 and later cert_createname mxr 3.2.1 and later cert_createocspcertid mxr 3.6 and later cert_createocsprequest mxr 3.6 and later cert_createrdn mxr 3.2.1 and later cert_createsubjectcertlist mxr 3.4 and later cert_createvalidity mxr 3.5 and later cert_crlcacherefreshissuer mxr 3.7 and later cert_decodealtnameextension mxr 3.10 and later cert_decodeauthinfoaccessextension mxr 3.10 and later cert_decodeauthkeyid mxr 3.10 and later cert_decodeavavalue mxr 3.4 and later cert_decodebasicconstraintvalue mxr 3.2 and later cert_decodecertfrompackage mxr 3.4 and later cert_decodecertif...
PKCS11 Implement
c_getattributevalue the nss calls c_getattributevalue to get the value of attributes for both single objects and multiple objects.
... c_setattributevalue the nss uses c_setattributevalue to change labels on private keys.
NSS functions
er cert_certlistfromcert mxr 3.2 and later cert_certtimesvalid mxr 3.2 and later cert_changecerttrust mxr 3.2 and later cert_checkcertvalidtimes mxr 3.2 and later cert_checknamespace mxr 3.12 and later cert_checkcertusage mxr 3.3 and later cert_comparename mxr 3.2 and later cert_comparevaliditytimes mxr 3.11 and later cert_completecrldecodeentries mxr 3.6 and later cert_convertanddecodecertificate mxr 3.9.3 and later cert_copyname mxr 3.4 and later cert_copyrdn mxr 3.5 and later cert_createava mxr 3.2.1 and later cert_createcertificate mxr 3.5 and later cert_createcertificatereq...
...uest mxr 3.2 and later cert_createname mxr 3.2.1 and later cert_createocspcertid mxr 3.6 and later cert_createocsprequest mxr 3.6 and later cert_createrdn mxr 3.2.1 and later cert_createsubjectcertlist mxr 3.4 and later cert_createvalidity mxr 3.5 and later cert_crlcacherefreshissuer mxr 3.7 and later cert_decodealtnameextension mxr 3.10 and later cert_decodeauthinfoaccessextension mxr 3.10 and later cert_decodeauthkeyid mxr 3.10 and later cert_decodeavavalue mxr 3.4 and later cert_decodebasicconstraintvalue mxr 3.2 and later cert_decodecertfrompackage mxr 3.4 and later cert_decodecertif...
sslcrt.html
syntax #include <cert.h> #include <certt.h> seccerttimevalidity cert_checkcertvalidtimes( certcertificate *cert, int64 t); parameters this function has the following parameters: cert a pointer to the certificate whose validity period you want to check against.
... returns the function returns an enumerator of type seccerttimevalidity: typedef enum { seccerttimevalid, seccerttimeexpired, seccerttimenotvalidyet } seccerttimevalidity; nss_cmpcertchainwcanames determines whether any of the signers in the certificate chain for a specified certificate are on a specified list of ca names.
NSS Tools certutil
the format of thevalidity-time argument is "yymmddhhmmss[+hhmm|-hhmm|z]".
...when this argument is used, the default three-month period is automatically added to any value given in thevalid-month argument.
Rhino overview
these features allow "computational reflection": that is, the ability for a script to determine and influence aspects of the way it is evaluated.
...setting this property to true requires that any calls that compile or evaluate javascript must supply a security domain object of any object type that will be used to identify javascript code.
The JavaScript Runtime
execution proceeds by evaluating this compiled form using support routines in rhino.
...for example, evaluating the expression obj["3"] will invoke the get(int, scriptable) method even though the property name was presented in the script as a string.
Invariants
some nameexpressions might refer to a variable or global; or might at runtime turn out to reference another object property, due to with, or a variable that isn't in the source code at all but was injected into a local scope by eval.
... these cases can be detected statically by looking for with and eval "nearby" in the parse tree.) if a nested function contains a nameexpression that refers to a variable in an enclosing scope which the function can outlive (i.e.
JSAPI Cookbook
to query whether a value has a particular type, use a correspondingly named member testing function: // javascript var v = computesomevalue(); var isstring = typeof v === "string"; var isnumber = typeof v === "number"; var isnull = v === null; var isboolean = typeof v === "boolean"; var isobject = typeof v === "object" && v !== null; /* jsapi */ js::rootedvalue v(cx, computesomevalue()); bool isstring = v.isstring(); bool isnumber = v.isnumber(); bool isint32 = v.isint32(); // note: internal representation, not numeric value boo...
...t a value use a correspondingly named member mutator function, or assign the result of the correspondingly named standalone function: // javascript var v; v = 0; v = 0.5; v = somestring; v = null; v = undefined; v = false; /* jsapi */ js::rootedvalue v(cx); js::rootedstring somestring(cx, ...); v.setint32(0); // or: v = js::int32value(0); v.setdouble(0.5); // or: v = js::doublevalue(0.5); v.setstring(somestring); // or: v = js::stringvalue(somestring); v.setnull(); // or: v = js::nullvalue(); v.setundefined(); // or: v = js::undefinedvalue(); v.setboolean(false); // or: v = js::booleanvalue(false); finding the global object many of these recipes require finding the current global object first.
DOUBLE_TO_JSVAL
please use js::doublevalue instead in spidermonkey 45 or later.
... see also mxr id search for double_to_jsval js::tonumber js_numbervalue js::doublevalue bug 1177892 -- removed ...
JS::CreateError
syntax // added in spidermonkey 45 bool js::createerror(jscontext *cx, jsexntype type, handleobject stack, handlestring filename, uint32_t linenumber, uint32_t columnnumber, jserrorreport *report, handlestring message, mutablehandlevalue rval); // obsolete since jsapi 39 bool js::createerror(jscontext *cx, jsexntype type, handlestring stack, handlestring filename, uint32_t linenumber, uint32_t columnnumber, jserrorreport *report, handlestring message, mutablehandlevalue rval); name type description cx jscontext * pointer to a js context from which to derive runtime information.
... rval js::mutablehandlevalue out parameter.
JS::OrdinaryToPrimitive
syntax bool js::ordinarytoprimitive(jscontext *cx, js::handleobject obj, jstype type, js::mutablehandlevalue vp); name type description cx jscontext * the context in which to perform the conversion.
... vp js::mutablehandlevalue out parameter.
JS::Remove*Root
syntax void removevalueroot(jscontext *cx, js::heap<js::value> *vp); void removestringroot(jscontext *cx, js::heap<jsstring *> *rp); void removeobjectroot(jscontext *cx, js::heap<jsobject *> *rp); void removescriptroot(jscontext *cx, js::heap<jsscript *> *rp); void removevaluerootrt(jsruntime *rt, js::heap<js::value> *vp); void removestringrootrt(jsruntime *rt, js::heap<jsstring *> *rp); void removeobjectrootrt(...
... see also mxr id search for js::removevalueroot mxr id search for js::removestringroot mxr id search for js::removeobjectroot mxr id search for js::removescriptroot mxr id search for js::removevaluerootrt mxr id search for js::removestringrootrt mxr id search for js::removeobjectrootrt mxr id search for js::removescriptrootrt bug 912581 bug 1107639 ...
JS::ToInt32
syntax bool js::toint32(jscontext *cx, js::handlevalue v, int32_t *out); name type description cx jscontext * the context in which to perform the conversion.
... v js::handlevalue the value to convert.
JS::ToInt64
syntax bool js::toint64(jscontext *cx, js::handlevalue v, int64_t *out); name type description cx jscontext * the context in which to perform the conversion.
... v js::handlevalue the value to convert.
JS::ToNumber
syntax bool js::tonumber(jscontext *cx, js::handlevalue v, double *out); name type description cx jscontext * the context in which to perform the conversion.
... v js::handlevalue the value to convert.
JS::ToString
syntax #include "js/conversions.h" // as of spidermonkey 38; previously in jsapi.h jsstring* js::tostring(jscontext *cx, js::handlevalue v) name type description cx jscontext * the context in which to perform the conversion.
... v js::handlevalue the value to convert.
JS::ToUint16
syntax bool js::touint16(jscontext *cx, js::handlevalue v, uint16_t *out); name type description cx jscontext * the context in which to perform the conversion.
... v js::handlevalue the value to convert.
JS::ToUint32
syntax bool js::touint32(jscontext *cx, js::handlevalue v, int32_t *out); name type description cx jscontext * the context in which to perform the conversion.
... v js::handlevalue the value to convert.
JS::ToUint64
syntax bool js::touint64(jscontext *cx, js::handlevalue v, uint64_t *out); name type description cx jscontext * the context in which to perform the conversion.
... v js::handlevalue the value to convert.
JSConvertOp
syntax typedef bool (* jsconvertop)(jscontext *cx, js::handleobject obj, jstype type, js::mutablehandlevalue vp); name type description cx jscontext * the context in which the convert is taking place.
... vp js::mutablehandlevalue out parameter.
JSHasInstanceOp
syntax typedef bool (* jshasinstanceop)(jscontext *cx, js::handleobject obj, js::mutablehandlevalue vp, bool *bp); name type description cx jscontext * the js context in which the type check is occurring.
... v js::mutablehandlevalue the value whose type is being checked.
JSPrincipals
some examples of security-enhanced api call are js_compilescriptforprincipals, js_compilefunctionforprincipals, and js_evaluatescriptforprincipals.
... these functions ensure that the given jsprincipals object is indelibly associated not only with the script being compiled or evaluated, but with all functions ever created by that script or code eval()-ed by it.
JSPropertyOp
syntax typedef bool (* jspropertyop)(jscontext *cx, js::handleobject obj, js::handleid id, js::mutablehandlevalue vp); typedef bool (* jsstrictpropertyop)(jscontext *cx, js::handleobject obj, js::handleid id, bool strict, js::mutablehandlevalue vp); // added in spidermonkey 1.9.3 name type description cx jscontext * the context in which the property access is taking place.
... vp js::mutablehandlevalue in/out parameter.
JSSecurityCallbacks.contentSecurityPolicyAllows
(it is also the type of the callback set by js_setcheckobjectaccesscallback.) syntax typedef jsbool (*jscspevalchecker)(jscontext *cx); name type description cx jscontext * the js context in which the property access attempt is occurring.
...jssecuritycallbacks.contentsecuritypolicyallows is invoked once per global object upon the first attempt to evaluate js code from a string (either through eval or the function constructor).
JSVAL_LOCK
if locking is successful, or v already cannot be garbage collected because it is not an object, string, or double value, jsval_lock evaluates to true.
... otherwise, it evaluates to false.
JSVAL_UNLOCK
if unlocking is successful, or v not affected by garbage collection because it is not an object, string, or double value, jsval_unlock evaluates to true.
... otherwise, it evaluates to false.
JS_DefineElement
syntax /* added in spidermonkey 38 (jsapi 32) */ bool js_defineelement(jscontext *cx, js::handleobject obj, uint32_t index, js::handlevalue value, unsigned attrs, jsnative getter = nullptr, jsnative setter = nullptr); bool js_defineelement(jscontext *cx, js::handleobject obj, uint32_t index, js::handleobject value, unsigned attrs, jsnative getter = nullptr, jsnative setter = nullptr); bool js_defineelement(jscontext *cx, js::handleobject obj, uint32_t index, js::handlestring value, unsigned attrs, jsnative getter = nullptr, jsnative setter = nullptr); bool js_defineelement(jsco...
... value js::handlevalue or js::handleobject or js::handlestring or int32_t or uint32_t or double or jsval initial value to assign to the property.
JS_DefineOwnProperty
syntax bool js_defineownproperty(jscontext *cx, js::handleobject obj, js::handleid id, js::handlevalue descriptor, bool *bp); name type description cx jscontext * the context.
... descriptor js::handlevalue this should be an jsval consisting of an object interpretable as property descriptor.
JS_ExecuteRegExp
syntax bool js_executeregexp(jscontext *cx, js::handleobject obj, js::handleobject reobj, char16_t *chars, size_t length, size_t *indexp, bool test, js::mutablehandlevalue rval); bool js_executeregexpnostatics(jscontext *cx, js::handleobject reobj, char16_t *chars, size_t length, size_t *indexp, bool test, js::mutablehandlevalue rval); name type description cx jscontext * the context.
... rval js::mutablehandlevalue out parameter.
JS_ExecuteScriptVersion
to execute a script that has not been compiled, use js::evaluate instead.
... see also js::compile js_executescript js::evaluate bug 1095660 ...
JS_ForwardGetPropertyTo
syntax bool js_forwardgetpropertyto(jscontext *cx, js::handleobject obj, js::handleid id, js::handleobject onbehalfof, js::mutablehandlevalue vp); bool js_forwardgetelementto(jscontext *cx, js::handleobject obj, uint32_t index, js::handleobject onbehalfof, js::mutablehandlevalue vp); name type description cx jscontext * a context.
... vp js::mutablehandlevalue out parameter.
JS_GetElement
syntax bool js_getelement(jscontext *cx, js::handleobject obj, uint32_t index, js::mutablehandlevalue vp); name type description cx jscontext * the context in which to perform the property lookup.
... vp js::mutablehandlevalue out parameter.
JS_GetPendingException
syntax bool js_getpendingexception(jscontext *cx, js::mutablehandlevalue vp); name type description cx jscontext * pointer to the js context in which the exception was thrown.
... vp js::mutablehandlevalue out parameter.
JS_GetPropertyDefault
def js::handlevalue default value if the property is not found.
... vp js::mutablehandlevalue out parameter.
JS_IsArrayObject
syntax bool js_isarrayobject(jscontext *cx, js::handlevalue value, bool *isarray); bool js_isarrayobject(jscontext *cx, js::handleobject obj, bool *isarray); // obsolete since jsapi 44 bool js_isarrayobject(jscontext *cx, js::handlevalue value); bool js_isarrayobject(jscontext *cx, js::handleobject obj); name type description cx jscontext * a context.
... value js::handlevalue the value to examine.
JS_LookupElement
syntax bool js_lookupelement(jscontext *cx, js::handleobject obj, uint32_t index, js::mutablehandlevalue vp); name type description cx jscontext * the context in which to look up the property.
... vp js::mutablehandlevalue out parameter.
JS_LookupProperty
syntax bool js_lookupproperty(jscontext *cx, js::handleobject obj, const char *name, js::mutablehandlevalue vp); bool js_lookupucproperty(jscontext *cx, js::handleobject obj, const char16_t *name, size_t namelen, js::mutablehandlevalue vp); bool js_lookuppropertybyid(jscontext *cx, js::handleobject obj, js::handleid id, js::mutablehandlevalue vp); // added in spidermonkey 1.8.1 bool js_lookupelement(jscontext *cx, js::handleobject obj, uint32_t index, js::mutablehandlevalue...
... vp); // ---- obsolete since spidermonkey 31 ---- bool js_lookuppropertywithflags(jscontext *cx, js::handleobject obj, const char *name, unsigned flags, js::mutablehandlevalue vp); bool js_lookuppropertywithflagsbyid(jscontext *cx, js::handleobject obj, js::handleid id, unsigned flags, js::mutablehandleobject objp, js::mutablehandlevalue vp); // added in spidermonkey 1.8.1 name type description cx jscontext * pointer to a js context from which to derive runtime information.
JS_New
syntax jsobject * js_new(jscontext *cx, js::handleobject ctor, const js::handlevaluearray& args); // added in jsapi 32 jsobject * js_new(jscontext *cx, jsobject *ctor, unsigned argc, jsval *argv); // obsolete since jsapi 32 name type description cx jscontext * the context in which to create the new object.
... args js::handlevaluearray &amp; an array of argument values to pass to the constructor.
JS_NewArrayObject
syntax jsobject * js_newarrayobject(jscontext *cx, const js::handlevaluearray& contents); // added in spidermonkey 31 jsobject * js_newarrayobject(jscontext *cx, size_t length); // added in spidermonkey 31 jsobject * js_newarrayobject(jscontext *cx, int length, jsval *vector); // obsolete since jsapi 30 name type description cx jscontext * the context in which to create the new array.
... contents js::handlevaluearray&amp; reference to the initial values for the array's elements.
JS_PropertyStub
syntax bool js_propertystub(jscontext *cx, js::handleobject obj, js::handleid id, js::mutablehandlevalue vp); bool js_strictpropertystub(jscontext *cx, js::handleobject obj, js::handleid id, js::mutablehandlevalue vp, js::objectopresult &result); // added in spidermonkey 45 bool js_strictpropertystub(jscontext *cx, js::handleobject obj, js::handleid id, bool strict, js::mutablehandlevalue vp); // obsolete since jsapi 39 bool js_resolvestub(jscontext *cx, js::handleobject obj, js::handleid id, bool *resolvedp); // obsolete since jsapi 37 bool js_deletepropertystub(jscontext *cx, js::handleobject obj, js::handleid id, bool *succee...
...ded); // obsolete since jsapi 37 bool js_enumeratestub(jscontext *cx, js::handleobject obj); // obsolete since jsapi 37 bool js_convertstub(jscontext *cx, js::handleobject obj, jstype type, js::mutablehandlevalue vp); // obsolete since jsapi 37 void js_finalizestub(jscontext *cx, jsobject *obj); // obsolete since jsapi 14 description the stub functions are not designed to be called directly by a jsapi application.
JS_Remove*Root
syntax jsbool js_removevalueroot(jscontext *cx, jsval *vp); jsbool js_removestringroot(jscontext *cx, jsstring **spp); jsbool js_removeobjectroot(jscontext *cx, jsobject **opp); jsbool js_removegcthingroot(jscontext *cx, void **rp); name type description cx jscontext * a context.
...see also mxr id search for js_removevalueroot mxr id search for js_removestringroot mxr id search for js_removeobjectroot mxr id search for js_removegcthingroot bug 912581 ...
JS_SetPendingException
syntax void js_setpendingexception(jscontext *cx, js::handlevalue v); name type description cx jscontext * pointer to a js context from which to derive runtime information.
... v js::handlevalue value to throw as an exception.
JS_ValueToFunction
syntax jsfunction * js_valuetofunction(jscontext *cx, js::handlevalue v); jsfunction * js_valuetoconstructor(jscontext *cx, js::handlevalue v); name type description cx jscontext * the context in which to perform the conversion.
... v js::handlevalue the value to convert.
JS_ValueToId
syntax bool js_valuetoid(jscontext *cx, js::handlevalue v, js::mutablehandleid idp); bool js_stringtoid(jscontext *cx, js::handlestring s, js::mutablehandleid idp); // added in spidermonkey 38 bool js_indextoid(jscontext *cx, uint32_t index, js::mutablehandleid idp); // added in spidermonkey 17 bool js_charstoid(jscontext* cx, js::twobytechars chars, js::mutablehandleid idp); // added in spidermonkey 24 void js::protokeytoid(jscontext *cx, jsprotokey key, js::mutablehandleid idp); // added in spidermonkey 38 name type description cx jscontext * a context.
... v js::handlevalue the js value to convert.
JS_ValueToObject
syntax bool js_valuetoobject(jscontext *cx, js::handlevalue v, js::mutablehandleobject objp); name type description cx jscontext * the context in which to convert the value.
... v js::handlevalue the value to convert.
PRIVATE_TO_JSVAL
please use js::privatevalue instead in spidermonkey 45 or later.
... see also mxr id search for private_to_jsval js::privatevalue bug 952650 bug 1177892 -- removed ...
JSDBGAPI
errupt watchpoints js_setwatchpoint js_clearwatchpoint js_clearwatchpointsforobject js_clearallwatchpoints inspecting the stack js_pctolinenumber js_linenumbertopc js_getfunctionscript js_getfunctionnative js_getfunctionfastnative js_getscriptprincipals typedef jsstackframe js_frameiterator js_getframescript js_getframepc js_getscriptedcaller js_stackframeprincipals js_evalframeprincipals js_getframeannotation js_setframeannotation js_getframeprincipalarray js_isnativeframe js_getframeobject js_getframescopechain js_getframecallobject js_getframethis js_getframefunction js_getframefunctionobject js_isconstructorframe js_isdebuggerframe js_getframereturnvalue js_setframereturnvalue js_getframecalleeobject js_getscriptfilename js_getscriptbaselin...
...enumber js_getscriptlineextent js_getscriptversion js_gettopscriptfilenameflags js_getscriptfilenameflags js_flagscriptfilenameprefix jsfilename_null jsfilename_system jsfilename_protected evaluating debug code js_evaluateinstackframe examining object properties typedef jspropertydesc jspd_enumerate jspd_readonly jspd_permanent jspd_alias jspd_argument jspd_variable jspd_exception jspd_error typedef jspropertydescarray js_propertyiterator js_getpropertydesc js_getpropertydescarray js_putpropertydescarray hooks js_setdebuggerhandler js_setsourcehandler js_setexecutehook js_setcallhook js_setobjecthook js_setthrowhook js_setdebugerrorhook js_setnewscripthook js_setdestroyscripthook js_getglobaldebughooks js_setcontextdebughooks me...
SpiderMonkey 1.8.7
n js_compileucfunctionforprincipalsversion js_compileucscriptforprincipalsversion js_consumejsontext (removed in future releases, replaced with js_parsejson) js_decompilescriptobject js_deepfreezeobject js_definefunctionbyid js_defineownproperty js_definepropertybyid js_deletepropertybyid js_deletepropertybyid2 js_doubleisint32 js_encodestringtobuffer js_entercrosscompartmentcall js_evaluatescriptforprincipalsversion js_evaluateucscriptforprincipalsversion js_executeregexp js_executeregexpnostatics js_executescriptversion js_forget_string_flatness js_fileescapedstring js_finishjsonparse (removed in future releases, replaced with js_parsejson) js_flatstringequalsascii js_flattenstring js_flushcaches js_freezeobject js_getcompartmentprivate js_getemptystring js_getfla...
...the jsval_to_double and double_to_jsval macros have been updated to work directly on jsdoubles rather than their pointers, and the js_newdoublevalue and js_newdouble interfaces have been removed.
SpiderMonkey 1.8
use js_newdoublevalue.
... two new context options can be used with js_setoptions: jsoption_relimit, which causes extremely long-running regular expression searches to fail with an error, and jsoption_anonfunfix, which bans anonymous functions from appearing anyplace where a statement could appear, such as in the argument to eval().
Fun With XBL and XPConnect
the initial value of this property evaluates to an xp-connect object.
... what i did for the xpcom object: <property name="autocompletelistener"> <![cdata[ ({ onautocompleteresult: function(aitem, aoriginalstring, amatch) { if ( aitem ) { anonymouscontent[0].value = amatch; } } }) ]]> </property> as long as the js for the value of autocompletelistener evaluates to an object (and wrapping the expression with a set of parens like i did, does this), then the value of autocompletelistener is an object that implements my interface.
Mozilla internal string guide
/* signature: void handleutf8string(const nsacstring& str); */ object->handleutf8string(ns_convertutf16toutf8(utf16string)); /* signature: void handleutf8buffer(const char* str); */ object->handleutf8buffer(ns_convertutf16toutf8(utf16string).get()); copyutf8toutf16(const nsacstring&, nsastring&) - converts and copies: // return a utf-16 value void foo::getunicodevalue(nsastring& result) { copyutf8toutf16(mlocalutf8value, result); } appendutf8toutf16(const nsacstring&, nsastring&) - converts and appends: // return a utf-16 value void foo::getunicodevalue(nsastring& result) { result.assignliteral("prefix:"); appendutf8toutf16(mlocalutf8value, result); } utf8tonewunicode(const nsacstring&, pruint32* autf16count = nsnull) - (avoid if possible...
...::getutf16value(char16_t** result) { *result = utf8tonewunicode(mlocalutf8value); } copyutf16toutf8(const nsastring&, nsacstring&) - converts and copies: // return a utf-8 value void foo::getutf8value(nsacstring& result) { copyutf16toutf8(mlocalutf16value, result); } appendutf16toutf8(const nsastring&, nsacstring&) - converts and appends: // return a utf-8 value void foo::getunicodevalue(nsacstring& result) { result.assignliteral("prefix:"); appendutf16toutf8(mlocalutf16value, result); } tonewutf8string(const nsastring&) - (avoid if possible) allocates and converts: void foo::getutf8value(char** result) { *result = tonewutf8string(mlocalutf16value); } latin1 / utf-16 conversion the following should only be used when you can guarantee that the original string i...
Components.utils.import
example components.utils.import("resource://gre/modules/xpcomutils.jsm", this); difference from mozijssubscriptloader the differences from mozijssubscriptloader: the behavior when importing/loading the same code from different locations: the subscript loader evaluates the specified code each time it is invoked, with the caller's global object.
... components.utils.import evaluates the code of each module only once, in its own scope.
Components object
utils.evalinsandbox runs javascript code in a sandbox, usually used to run code with restricted privileges.
... utils.sandbox creates sandbox objects for use with evalinsandbox.
Language bindings
it returns a reference to the clone:components.utils.createobjectincomponents.utils.createobjectin creates a new javascript object in the scope of the specified object's compartment.components.utils.evalinsandboxthe evalinsandbox() function enables you to evaluate javascript code inside a sandbox you've previously created using the components.utils.sandbox constructor.components.utils.evalinwindowthis function enables code running in a more-privileged javascript context to evaluate a string in a less-privileged javascript context.
...it is meant for use by extension developers who have exception handler blocks which want to "eat" an exception, but still want to report it to the console.components.utils.sandboxcomponents.utils.sandbox is used to create a sandbox object for use with evalinsandbox().components.utils.scheduleprecisegcthis method lets scripts schedule a garbage collection cycle.
nsIDOMEvent
eventphase unsigned short used to indicate which phase of event flow is currently being evaluated.
... at_target 2 the event is currently being evaluated at the target eventtarget.
nsIHttpHeaderVisitor
it implements the nsihttpheadervisitor interface in javascript and uses it to evaluate the mime type of a http response.
...when the observer fires, the visitor interface is used to walk through the response headers and evaluate the mime type.
nsIXULTemplateBuilder
these rules are evaluated by the template builder for each result produced by the query.
...the bindings are evaluated after a rule has matched.
nsMsgSearchScope
defined in comm-central/ mailnews/ base/ search/ public/ nsmsgsearchcore.idl [scriptable, uuid(6e893e59-af98-4f62-a326-0f00f32147cd)] interface nsmsgsearchscope { const nsmsgsearchscopevalue offlinemail = 0; const nsmsgsearchscopevalue offlinemailfilter = 1; const nsmsgsearchscopevalue onlinemail = 2; const nsmsgsearchscopevalue onlinemailfilter = 3; /// offline news, base table, no body or junk const nsmsgsearchscopevalue localnews = 4; const nsmsgsearchscopevalue news = 5; const nsmsgsearchscopevalue newsex = 6; const nsmsgsearchscopevalue ldap = 7; const nsmsgsearchscopevalue localab = 8; const nsmsgsearchscopevalue allsearchablegroups = 9; const nsmsgsearchscopevalue newsfilter = 10; const nsmsgsearchscopevalue localaband = 11; const nsmsgsearchscopeva...
...lue ldapand = 12; // imap and news, searched using local headers const nsmsgsearchscopevalue onlinemanual = 13; /// local news + junk const nsmsgsearchscopevalue localnewsjunk = 14; /// local news + body const nsmsgsearchscopevalue localnewsbody = 15; /// local news + junk + body const nsmsgsearchscopevalue localnewsjunkbody = 16; }; ...
NS_ASSERTION
summary macro throws an assertion failure if the first macro argument does not evaluate to true.
...only if the assertion evaluates to false is there an "assertion failure", which is thrown.
XPCOM Interface Reference by grouping
onevent nsidomprogressevent nsidomsimplegestureevent nsidragdrophandler nsidragservice nsidragsession html nsiaccessibilityservice nsiaccessiblecoordinatetype nsiaccessibledocument nsiaccessibleeditabletext nsiaccessibleevent nsiaccessiblehyperlink nsiaccessiblehypertext nsiaccessibleimage nsiaccessibleprovider nsiaccessibleretrieval nsiaccessiblerole nsiaccessiblescrolltype nsiaccessibleselectable nsiaccessiblestates nsiaccessibletable nsiaccessibletext nsiaccessibletreecache nsiaccessiblevalue nsiaccessnode nsisyncmessagesender script nsiscriptableunescapehtml nsiscriptableunicodeconverter nsiscripterror nsiscripterror2 stylesheet nsistylesheetservi...
...ce url nsiuri nsiurl util nsidomserializer nsidomxpathevaluator nsidomxpathexception nsidomxpathexpression nsidomxpathresult xslt nsixsltexception nsixsltprocessor download nsidownload nsidownloadmanager nsidownloadprogresslistener element internal nsiworker nsiworkerglobalscope nsiworkermessageevent nsiworkermessageport nsiworkerscope tree nsitreeboxobject nsitreecolumn nsitreecolumns nsitreecontentview nsitreeselection nsitreeview xform nsixformsmodelelement nsixformsnsinstanceelement nsixformsnsmodelelement xmlhttprequest nsixmlhttprequesteventtarget favicon nsifavicondatacallback nsifaviconservice ...
Storage
in c++, the code would look something like this: bool hasmoredata; while (ns_succeeded(statement->executestep(&hasmoredata)) && hasmoredata) { print32 value; rv = statement->getint32(0, &value); ns_ensure_success(rv, rv); } you can obtain other types of data by using the various methods available on mozistoragevaluearray.
... mozistoragevaluearray wraps an array of sql values, such as a result row.
MailNews Filters
filter execution is done by evaluating the search terms using the core mailnews/base/search code, and then applying the filter hits when the search terms match.
...for each new header, we evaluate the filter criteria and apply the actions synchronously, including moving a message to an other local folder, and advance to the next header.
CType
tosource() returns a javascript expression that evaluates to a ctype describing the same c type as this object.
... return value a javascript expression that evaluates to a ctype describing the same c type as this object.
Streams - Plugins
if an error occurs during data retrieval or writing to the file, the browser passes null for the filename.
...the fname parameter specifies the full path to a local file (or null if an error occurs during data retrieval or writing to the file).
Debugger.Environment - Firefox Developer Tools
function calls, calls to eval, let blocks, catch blocks, and the like create declarative environment records.
... setvariable(name,value) storevalue as the value of the variable bound toname in this environment.name must be a string that is a valid ecmascript identifier name;value must be a debuggee value.
Tutorial: Show Allocations Per Call Path - Firefox Developer Tools
factory('div'); var spanfactory = makefactory('span'); function divsandspans() { for (i = 0; i < 10; i++) { var div = divfactory('div #' + i); div.appendchild(spanfactory('span #' + i)); document.body.appendchild(div); } } function dodivsandspans() { divsandspans(); } </script> open the browser console (menu button > developer > browser console), and then evaluate the expression demotrackallocations() in the browser console.
... back in the browser console, evaluate the expression demoplotallocations().
Debugger-API - Firefox Developer Tools
a debugger.source can furnish a full copy of its source code, and explain how the code entered the system, whether via a call to eval, a <script> element, or otherwise.
... examples here are some things you can try out yourself that show off some of debugger’s features: setting a breakpoint in a page, running a handler function when it is hit that evaluates an expression in the page’s context.
Deprecated tools - Firefox Developer Tools
the editor mode can be triggered clicking on the icon on the right of the console input, or with ctrl + b (cmd + b on macos) when in editor mode, the enter key adds a new line in the input, and you can evaluate the expression using ctrl + enter (cmd + enter on macos).
... when evaluating, the input isn't cleared, which makes it possible to quickly iterrate over a snippet of code.
Web Console Helpers - Firefox Developer Tools
$x(xpath, element, resulttype) evaluates the xpath xpath expression in the context of element and returns an array of matching nodes.
... cd() switches javascript evaluation context to a different iframe in the page.
Rich output - Firefox Developer Tools
the output will look something like this: console.log(todolist) array(4) [ {…}, {…}, {…}, {…} ] debugger eval code:1:9 undefined if you expand objects, such as arrays, you get slightly different content.
...escription: "morning pages", datecreated: 1552404478137 } ​ 1: object { status: "in progress", description: "refactor styles", datecreated: 1552404493169 } ​ 2: object { status: "to do", description: "create feedback form", datecreated: 1552404512630 } ​ 3: object { status: "to do", description: "normalize table", datecreated: 1552404533790 } ​ length: 4 ​ <prototype>: array [] debugger eval code:1:9 undefined highlighting and inspecting dom nodes if you hover the mouse over any dom element in the console output, it's highlighted on the page: in the screenshot above you'll also see a blue "target" icon next to the node in the console output: click it to switch to the inspector with that node selected.
Attr - Web APIs
WebAPIAttr
as that doesn't hold true in cases like attr objects being returned by document.evaluate, the dom living standard reintroduced the property.
... nodevalue use attr.value instead.
BluetoothRemoteGATTCharacteristic - Web APIs
value; promise<bluetoothremotegattdescriptor> getdescriptor(bluetoothdescriptoruuid descriptor); promise<sequence<bluetoothremotegattdescriptor>> getdescriptors(optional bluetoothdescriptoruuid descriptor); promise<dataview> readvalue(); promise<void> writevalue(buffersource value); promise<void> startnotifications(); promise<void> stopnotifications(); }; bluetoothremotegattcharacteristic implements eventtarget; bluetoothremotegattcharacteristic implements characteristiceventhandlers; properties bluetoothremotegattcharacteristic.serviceread only returns the bluetoothgattservice this characteristic belongs to.
... bluetoothremotegattcharacteristic.writevalue() sets the value property to the bytes contained in an arraybuffer and returns a promise.
Using the CSS Painting API - Web APIs
the second will be a cssstylevalue.
... if the custom argument is a css value, for instance a unit, we can invoke typed om cssstylevalue class (and sub classes) by using the value type keyword when we retrieve it in the registerpaint() function.
Document.createNSResolver() - Web APIs
notes adapts any dom node to resolve namespaces so that an xpath expression can be easily evaluated relative to the context of the node where it appeared within the document.
... see also document.evaluate introduction to using xpath in javascript specifications specification status comment document object model (dom) level 3 xpath specificationthe definition of 'document.creatensresolver' in that specification.
HTMLTextAreaElement - Web APIs
this constraint is evaluated only when the value changes.
...this constraint is evaluated only when the value changes.
Using IndexedDB - Web APIs
console.log("name for ssn 444-44-4444 is " + request.result.name); }; that's a lot of code for a "simple" retrieval.
... xhrfields: { responsetype: 'blob' }, // success: function(data, textstatus, jqxhr) { // console.log("blob retrieved"); // console.log("blob:", data); // // addpublication(biblioid, title, year, data); // }, // error: function(jqxhr, textstatus, errorthrown) { // console.error(errorthrown); // displayactionfailure("error during blob retrieval"); // } // }); } /** * @param {string} biblioid * @param {string} title * @param {number} year * @param {blob=} blob */ function addpublication(biblioid, title, year, blob) { console.log("addpublication arguments:", arguments); var obj = { biblioid: biblioid, title: title, year: year }; if (typeof blob != 'undefined') obj.blob = blob; var sto...
PaymentResponse.retry() - Web APIs
} async function dopaymentrequest() { const request = new paymentrequest(methoddata, details, options); const response = await request.show(); await recursivevalidate(request, response); await response.complete("success"); } // keep validating until the data looks good!
... async function recursivevalidate(request, response) { const promisestofixthings = []; const errors = await validate(request, response); if (!errors) { return; } if (errors.shippingaddress) { // "shippingaddresschange" fired at request object const promise = fixfield(request, "shippingaddresschange", shippingvalidator); promisestofixthings.push(promise); } if (errors.payer) { // "payerdetailchange" fired at response object const promise = fixfield(response, "payerdetailchange", payervalidator); promisestofixthings.push(promise); } await promise.all([response.retry(errors), ...promisestofixthings]); await recursivevalidate(request, response); } function fixfield(requestorresponse, event, validator) { return new promise(resolve => { // brows...
PublicKeyCredentialRequestOptions - Web APIs
publickeycredentialrequestoptions.timeout optional a numerical hint, in milliseconds, which indicates the time the caller is willing to wait for the retrieval operation to complete.
... publickeycredentialrequestoptions.allowcredentials optional an array of credentials descriptor which restricts the acceptable existing credentials for retrieval.
SVGAnimatedBoolean - Web APIs
interface overview also implement none methods none properties readonly boolean baseval readonly boolean animval normative document svg 1.1 (2nd edition) properties name type description baseval boolean the base value of the given attribute before applying any animations.
...if the given attribute or property is not currently being animated, contains the same value as baseval.
SVGAnimatedEnumeration - Web APIs
interface overview also implement none methods none properties unsigned short baseval readonly unsigned short animval normative document svg 1.1 (2nd edition) properties name type description baseval unsigned short the base value of the given attribute before applying any animations.
...if the given attribute or property is not currently being animated, contains the same value as baseval.
SVGAnimatedInteger - Web APIs
interface overview also implement none methods none properties readonly long baseval readonly long animval normative document svg 1.1 (2nd edition) properties name type description baseval long the base value of the given attribute before applying any animations.
...if the given attribute or property is not currently being animated, contains the same value as baseval.
SVGAnimatedLength - Web APIs
interface overview also implement none methods none properties readonly svglength baseval readonly svglength animval normative document svg 1.1 (2nd edition) properties name type description baseval svglength the base value of the given attribute before applying any animations.
...if the given attribute or property is not currently being animated, contains the same value as baseval.
SVGAnimatedNumber - Web APIs
interface overview also implement none methods none properties float baseval readonly float animval normative document svg 1.1 (2nd edition) properties name type description baseval float the base value of the given attribute before applying any animations.
...if the given attribute or property is not currently being animated, contains the same value as baseval.
StylePropertyMapReadOnly.get() - Web APIs
the get() method of the stylepropertymapreadonly interface returns a cssstylevalue object for the first value of the specified property.
... return value a cssstylevalue object.
WebGL model view projection - Web APIs
first take a look at the vertex shader that will move the vertices on the screen: // the individual position vertex attribute vec3 position; void main() { // the gl_position is the final position in clip space after the vertex shader modifies it gl_position = vec4(position, 1.0); } next, to actually rasterize the data into pixels, the fragment shader evaluates everything on a per pixel basis, setting a single color.
... homogeneoustocartesian([10, 4, 5, 0]); this evaluates to: [infinity, infinity, infinity].
Using the Web Speech API - Web APIs
var synth = window.speechsynthesis; var inputform = document.queryselector('form'); var inputtxt = document.queryselector('.txt'); var voiceselect = document.queryselector('select'); var pitch = document.queryselector('#pitch'); var pitchvalue = document.queryselector('.pitch-value'); var rate = document.queryselector('#rate'); var ratevalue = document.queryselector('.rate-value'); var voices = []; populating the select element to populate the <select> element with the different voice options the device has available, we've written a populatevoicelist() function.
... pitch.onchange = function() { pitchvalue.textcontent = pitch.value; } rate.onchange = function() { ratevalue.textcontent = rate.value; } ...
XPathResult.booleanValue - Web APIs
syntax var value = result.booleanvalue; return value the return value is the boolean value of the xpathresult returned by document.evaluate().
... html <div>xpath example</div> <p>text is 'xpath example': <output></output></p> javascript var xpath = "//div/text() = 'xpath example'"; var result = document.evaluate(xpath, document, null, xpathresult.boolean_type, null); document.queryselector("output").textcontent = result.booleanvalue; result specifications specification status comment document object model (dom) level 3 xpath specificationthe definition of 'xpathresult.booleanvalue' in that specification.
XPathResult.numberValue - Web APIs
syntax var value = result.numbervalue; return value the return value is the numeric value of the xpathresult returned by document.evaluate().
... html <div>xpath example</div> <div>number of &lt;div&gt;s: <output></output></div> javascript var xpath = "count(//div)"; var result = document.evaluate(xpath, document, null, xpathresult.number_type, null); document.queryselector("output").textcontent = result.numbervalue; result specifications specification status comment document object model (dom) level 3 xpath specificationthe definition of 'xpathresult.numbervalue' in that specification.
XPathResult.resultType - Web APIs
constants result type defined constant value description any_type 0 a result set containing whatever type naturally results from evaluation of the expression.
... html <div>xpath example</div> <div>is xpath result a node set: <output></output></div> javascript var xpath = "//div"; var result = document.evaluate(xpath, document, null, xpathresult.any_type, null); document.queryselector("output").textcontent = result.resulttype >= xpathresult.unordered_node_iterator_type && result.resulttype <= xpathresult.first_ordered_node_type; result specifications specification status comment document object model (dom) level 3 xpath specificationthe definition of 'xpathresult.re...
XPathResult.stringValue - Web APIs
syntax var value = result.stringvalue; return value the return value is the string value of the xpathresult returned by document.evaluate().
... html <div>xpath example</div> <div>text content of the &lt;div&gt; above: <output></output></div> javascript var xpath = "//div/text()"; var result = document.evaluate(xpath, document, null, xpathresult.string_type, null); document.queryselector("output").textcontent = result.stringvalue; result specifications specification status comment document object model (dom) level 3 xpath specificationthe definition of 'xpathresult.stringvalue' in that specification.
XRWebGLLayerInit.antialias - Web APIs
example in this example, before creating a new xrwebgllayer to use for rendering, the value of a user preference from a configuration interface is obtained using a function called getpreferencevalue() to determine whether the user has enabled or disabled anti-aliasing support; this is passed into the constructor.
... let options = { antialias: getpreferencevalue("antialiasing") }; let gllayer = new xrwebgllayer(xrsession, gl, options); if (gllayer) { xrsession.updaterenderstate({ baselayer: gllayer }); } offering the user features such as the ability to enable or disable things like anti-aliasing can provide them with optiions to try when your app isn't performing as well as they'd like.
Accessibility and Spacial Patterns - Accessibility
in 2005, arnold wilkins, john emmett, and graham harding evaluated the guidelines for characterizing patterned images that could precipitate seizures.
...which they published in the paper, characterizing the patterned images that precipitate seizures and optimizing guidelines to prevent them the steps necessary to evaluate material reduce to the following: look at the screen are there more than five stripes?
At-rules - CSS: Cascading Style Sheets
WebCSSAt-rule
furthermore, they all convey a common semantic meaning—they all link some type of condition, which at any time evaluates to either true or false.
... if the condition evaluates to true, then all of the statements within the group will be applied.
Color picker tool - CSS: Cascading Style Sheets
'hsl' : 'hsv'; this.color.setformat(this.picker_mode); this.createpickingarea(); this.createhuearea(); this.newinputcomponent('h', 'hue', this.inputchangehue.bind(this)); this.newinputcomponent('s', 'saturation', this.inputchangesaturation.bind(this)); this.newinputcomponent('v', 'value', this.inputchangevalue.bind(this)); this.newinputcomponent('l', 'lightness', this.inputchangelightness.bind(this)); this.createalphaarea(); this.newinputcomponent('r', 'red', this.inputchangered.bind(this)); this.newinputcomponent('g', 'green', this.inputchangegreen.bind(this)); this.newinputcomponent('b', 'blue', this.inputchangeblue.bind(this)); this.createpreviewbox(); this.createchangemodebutton(...
...pe.inputchangehue = function inputchangehue(e) { var value = parseint(e.target.value); this.sethue(value); this.updatehuepicker(); }; colorpicker.prototype.inputchangesaturation = function inputchangesaturation(e) { var value = parseint(e.target.value); this.color.setsaturation(value); e.target.value = this.color.saturation; this.updateslv(); }; colorpicker.prototype.inputchangevalue = function inputchangevalue(e) { var value = parseint(e.target.value); this.color.setvalue(value); e.target.value = this.color.value; this.updateslv(); }; colorpicker.prototype.inputchangelightness = function inputchangelightness(e) { var value = parseint(e.target.value); this.color.setlightness(value); e.target.value = this.color.lightness; this.updateslv(); }; colorpicke...
Testing media queries programmatically - CSS: Cascading Style Sheets
creating a media query list before you can evaluate the results of a media query, you need to create the mediaquerylist object representing the query.
...of a query once you've created your media query list, you can check the result of the query by looking at the value of its matches property: if (mediaquerylist.matches) { /* the viewport is currently in portrait orientation */ } else { /* the viewport is not currently in portrait orientation, therefore landscape */ } receiving query notifications if you need to be aware of changes to the evaluated result of the query on an ongoing basis, it's more efficient to register a listener than to poll the query's result.
Audio and video manipulation - Developer guides
e="edit" /> <input id="reset" type="button" value="reset" /> </div> <textarea id="code" class="playable-code"> var myvideo = document.getelementbyid('my-video'); myvideo.playbackrate = 2;</textarea> var textarea = document.getelementbyid('code'); var reset = document.getelementbyid('reset'); var edit = document.getelementbyid('edit'); var code = textarea.value; function setplaybackrate() { eval(textarea.value); } reset.addeventlistener('click', function() { textarea.value = code; setplaybackrate(); }); edit.addeventlistener('click', function() { textarea.focus(); }) textarea.addeventlistener('input', setplaybackrate); window.addeventlistener('load', setplaybackrate); note: try the playbackrate example live.
...t(), audiosource = context.createmediaelementsource(document.getelementbyid("my-video")), filter = context.createbiquadfilter(); audiosource.connect(filter); filter.connect(context.destination); var textarea = document.getelementbyid('code'); var reset = document.getelementbyid('reset'); var edit = document.getelementbyid('edit'); var code = textarea.value; function setfilter() { eval(textarea.value); } reset.addeventlistener('click', function() { textarea.value = code; setfilter(); }); edit.addeventlistener('click', function() { textarea.focus(); }) textarea.addeventlistener('input', setfilter); window.addeventlistener('load', setfilter); note: unless you have cors enabled, to avoid security issues your video should be on the same domain as your code.
<picture>: The Picture element - HTML: Hypertext Markup Language
WebHTMLElementpicture
the media attribute the media attribute specifies a media condition (similar to a media query) that the user agent will evaluate for each <source> element.
... if the <source>'s media condition evaluates to false, the browser skips it and evaluates the next element inside <picture>.
itemtype - HTML: Hypertext Markup Language
aggregaterating"> rating: <span itemprop="ratingvalue">4.4</span> stars, based on <span itemprop="reviewcount">89 </span> reviews </span><p> <span itemprop="offers" itemscope itemtype="http://schema.org/offer"> regular price: $179.99<br> <meta itemprop="pricecurrency" content="usd" /> <span itemprop="price">sale price: $119.99<br></span> (sale ends <time itemprop="pricevaliduntil" datetime="2020-11-05"> 5 november!</time>)<br> available from: <span itemprop="seller" itemscope itemtype="http://schema.org/organization"> <span itemprop="name">executive objects<br></span> </span> condition: <link itemprop="itemcondition" href="http://schema.org/usedcondition"/>previously owned, in excellent condition<br> ...
... itemprop brand [thing] itemprop name acme itemscope itemprop[itemtype] aggregaterating[aggregaterating] itemprop ratingvalue 4.4 itemprop reviewcount 89 itemprop offers [offer] http://schema.org/offer itemprop pricecurrency usd itemprop price 119.99 itemprop pricevaliduntil 2020-11-05 itemprop itemcondition http://schema.org/usedcondition itemprop availability http://schema.org/instock itemscope itemprop[itemtype] seller [organization] http://schema.org/organization itemprop name executive objects note: a handy tool for extracting microdata structures from html is google's structured da...
Content-Security-Policy - HTTP
content-security-policy: default-src 'self' http://example.com; connect-src 'none'; content-security-policy: connect-src http://example.com/; script-src http://example.com/ examples example: disable unsafe inline/eval, only allow loading of resources (images, fonts, scripts, etc.) over https: // header content-security-policy: default-src https: // meta tag <meta http-equiv="content-security-policy" content="default-src https:"> example: pre-existing site that uses too much inline code to fix but wants to ensure resources are loaded only over https and to disable plugins: content-security-policy: default-...
...src https: 'unsafe-eval' 'unsafe-inline'; object-src 'none' example: do not implement the above policy yet; instead just report violations that would have occurred: content-security-policy-report-only: default-src https:; report-uri /csp-violation-report-endpoint/ see mozilla web security guidelines for more examples.
Warning - HTTP
WebHTTPHeadersWarning
note: the warning header is soon to be deprecated; see warning (https://github.com/httpwg/http-core/issues/139) and warning: header & stale-while-revalidate (https://github.com/whatwg/fetch/issues/913) for more details.
... 111 revalidation failed an attempt to validate the response failed, due to an inability to reach the server.
A re-introduction to JavaScript (JS tutorial) - JavaScript
function countchars(elm) { if (elm.nodetype == 3) { // text_node return elm.nodevalue.length; } var count = 0; for (var i = 0, child; child = elm.childnodes[i]; i++) { count += countchars(child); } return count; } this highlights a potential problem with anonymous functions: how do you call them recursively if they don't have a name?
...you can use named iifes (immediately invoked function expressions) as shown below: var charsinbody = (function counter(elm) { if (elm.nodetype == 3) { // text_node return elm.nodevalue.length; } var count = 0; for (var i = 0, child; child = elm.childnodes[i]; i++) { count += counter(child); } return count; })(document.body); the name provided to a function expression as above is only available to the function's own scope.
Enumerability and ownership of properties - JavaScript
property enumerability and ownership - built-in methods of detection, retrieval, and iteration functionality own object own object and its prototype chain prototype chain only detection enumerable nonenumerable enumerable and nonenumerable propertyisenumerable hasownproperty hasownproperty – filtered to exclude enumerables using pr...
...opertyisenumerable hasownproperty enumerable nonenumerable enumerable and nonenumerable not available without extra code not available without extra code in not available without extra code retrieval enumerable nonenumerable enumerable and nonenumerable object.keys getownpropertynames getownpropertysymbols getownpropertynames, getownpropertysymbols – filtered to exclude enumerables using propertyisenumerable getownpropertynames getownpropertysymbols not availa...
Introduction - JavaScript
along the bottom of the console is an input line that you can use to enter javascript, and the output appears in the panel above: the console works the exact same way as eval: the last expression entered is returned.
... for the sake of simplicity, it can be imagined that every time something is entered into the console, it is actually surrounded by console.log around eval, like so: function greetme(yourname) { alert("hello " + yourname) } console.log(eval('3 + 5')) multi-line input in the web console the single-line input mode of the web console is great for quick testing of javascript expressions, but although you can execute multiple lines, it's not very convenient for that.
Default parameters - JavaScript
in the following example, if no value is provided for b when multiply is called, b's value would be undefined when evaluating a * b and multiply would return nan.
... function test(num = 1) { console.log(typeof num) } test() // 'number' (num is set to 1) test(undefined) // 'number' (num is set to 1 too) // test with other falsy values: test('') // 'string' (num is set to '') test(null) // 'object' (num is set to null) evaluated at call time the default argument is evaluated at call time.
AsyncFunction - JavaScript
each must be a string that corresponds to a valid javascript identifier or a list of such strings separated with a comma; for example "x", "thevalue", or "a,b".
... this is different from using eval with code for an async function expression.
Error.prototype.toSource() - JavaScript
the tosource() method returns code that could eval to the same error.
...this string can be evaluated to create an (approximately) equal object.
Error - JavaScript
evalerror creates an instance representing an error that occurs regarding the global function eval().
...or using the try...catch construct: try { throw new error('whoops!') } catch (e) { console.error(e.name + ': ' + e.message) } handling a specific error you can choose to handle only specific error types by testing the error type with the error's constructor property or, if you're writing for modern javascript engines, instanceof keyword: try { foo.bar() } catch (e) { if (e instanceof evalerror) { console.error(e.name + ': ' + e.message) } else if (e instanceof rangeerror) { console.error(e.name + ': ' + e.message) } // ...
JSON.stringify() - JavaScript
therefore, if compatibility with older javascript engines is required, it is perilous to directly substitute the string returned by json.stringify into a javascript string to be passed to eval or new function or as part of a jsonp url, and the following utility can be used: function jsfriendlyjsonstringify (s) { return json.stringify(s).
... replace(/\u2029/g, '\\u2029'); } var s = { a: string.fromcharcode(0x2028), b: string.fromcharcode(0x2029) }; try { eval('(' + json.stringify(s) + ')'); } catch (e) { console.log(e); // "syntaxerror: unterminated string literal" } // no need for a catch eval('(' + jsfriendlyjsonstringify(s) + ')'); // console.log in firefox unescapes the unicode if // logged to console, so we use alert alert(jsfriendlyjsonstringify(s)); // {"a":"\u2028","b":"\u2029"} note: properties of non-array objects are not guaranteed to be stringified in any particular order.
Object.prototype.toSource() - JavaScript
for example: function person(name) { this.name = name; } person.prototype.tosource = function person_tosource() { return 'new person(' + uneval(this.name) + ')'; }; console.log(new person('joe').tosource()); // ---> new person("joe") built-in tosource() methods each core javascript type has its own tosource() method.
...for example: var obj1 = {}; var obj2 = { a: obj1 }; obj1.b = obj2; console.log('cyclical: ' + (obj1.b.a == obj1)); var objsource = obj1.tosource(); // returns "({b:{a:{}}})" obj1 = eval(objsource); console.log('cyclical: ' + (obj1.b.a == obj1)); if a cyclical structure is employed and tosource() is needed, the object must provide an override to tosource(), either using a reference to a constructor or providing an anonymous function.
Object.prototype.valueOf() - JavaScript
the following code assigns a user-defined function to the object's valueof method: mynumbertype.prototype.valueof = function() { return customprimitivevalue; }; with the preceding code in place, any time an object of type mynumbertype is used in a context where it is to be represented as a primitive value, javascript automatically calls the function defined in the preceding code.
... examples using valueof on custom types function mynumbertype(n) { this.number = n; } mynumbertype.prototype.valueof = function() { return this.number; }; var myobj = new mynumbertype(4); myobj + 3; // 7 using unary plus +"5" // 5 (string to number) +"" // 0 (string to number) +"1 + 2" // nan (doesn't evaluate) +new date() // same as (new date()).gettime() +"foo" // nan (string to number) +{} // nan +[] // 0 (tostring() returns an empty string list) +[1] // 1 +[1,2] // nan +new set([1]) // nan +bigint(1) // uncaught typeerror: cannot convert a bigint value to a number +undefined // nan +null // 0 +true // 1 +false // 0 specifications specification ecmascript (ecma-262)the d...
Promise.prototype.then() - JavaScript
the value received and returned is: " + value); return value; }); // instantly logging the value of thenprom console.log(thenprom); // using settimeout we can postpone the execution of a function to the moment the stack is empty settimeout(() => { console.log(thenprom); }); // logs, in order: // promise {[[promisestatus]]: "pending", [[promisevalue]]: undefined} // "this gets called after the end of the main stack.
... the value received and returned is: 33" // promise {[[promisestatus]]: "resolved", [[promisevalue]]: 33} description as the then and promise.prototype.catch() methods return promises, they can be chained — an operation called composition.
Promise - JavaScript
not to be confused with: several other languages have mechanisms for lazy evaluation and deferring a computation, which they also call "promises", e.g.
...if you are looking to lazily evaluate an expression, consider the arrow function with no arguments: f = () => expression to create the lazily-evaluated expression, and f() to evaluate.
String.prototype.replace() - JavaScript
this forces the evaluation of the match prior to the tolowercase() method.
... let newstring = propertyname.replace(/[a-z]/g, '-' + '$&'.tolowercase()); // won't work this is because '$&'.tolowercase() would first be evaluated as a string literal (resulting in the same '$&') before using the characters as a pattern.
SyntaxError() constructor - JavaScript
syntax new syntaxerror([message[, filename[, linenumber]]]) parameters message optional human-readable description of the error filename optional the name of the file containing the code that caused the exception linenumber optional the line number of the code that caused the exception examples catching a syntaxerror try { eval('hoo bar'); } catch (e) { console.error(e instanceof syntaxerror); console.error(e.message); console.error(e.name); console.error(e.filename); console.error(e.linenumber); console.error(e.columnnumber); console.error(e.stack); } creating a syntaxerror try { throw new syntaxerror('hello', 'somefile.js', 10); } catch (e) { console.error(e instanceof syntaxerror); // true cons...
...ole.error(e.message); // hello console.error(e.name); // syntaxerror console.error(e.filename); // somefile.js console.error(e.linenumber); // 10 console.error(e.columnnumber); // 0 console.error(e.stack); // @debugger eval code:3:9 } specifications specification ecmascript (ecma-262)the definition of 'nativeerror constructor' in that specification.
SyntaxError - JavaScript
examples catching a syntaxerror try { eval('hoo bar'); } catch (e) { console.error(e instanceof syntaxerror); console.error(e.message); console.error(e.name); console.error(e.filename); console.error(e.linenumber); console.error(e.columnnumber); console.error(e.stack); } creating a syntaxerror try { throw new syntaxerror('hello', 'somefile.js', 10); } catch (e) { console.error(e instanceof syntaxerror); // true cons...
...ole.error(e.message); // hello console.error(e.name); // syntaxerror console.error(e.filename); // somefile.js console.error(e.linenumber); // 10 console.error(e.columnnumber); // 0 console.error(e.stack); // @debugger eval code:3:9 } specifications specification ecmascript (ecma-262)the definition of 'syntaxerror' in that specification.
TypedArray.prototype.findIndex() - JavaScript
polyfill typedarray.prototype.findindex = array.prototype.findindex = array.prototype.findindex || function(evaluator, thisarg) { 'use strict'; if (!this) { throw new typeerror('array.prototype.some called on null or undefined'); } if (typeof(evaluator) !== 'function') { if (typeof(evaluator) === 'string') { // attempt to convert it to a function if ( !
... (evaluator = eval(evaluator)) ){ throw new typeerror(); } } else { throw new typeerror(); } } var i; if (thisarg === undefined) { // optimize for thisarg for (i in this) { if (evaluator(this[i], i, this)) { return i; } } return -1; } for (i in this) { if (evaluator.call(thisarg, this[i], i, this)) { return i; } } return -1; }; examples find the index of a prime number in a typed array the following example finds the index of an element in the typed array that is a prime number (or returns -1 if there is no prime number).
Standard built-in objects - JavaScript
eval() uneval() isfinite() isnan() parsefloat() parseint() encodeuri() encodeuricomponent() decodeuri() decodeuricomponent() deprecated escape() unescape() fundamental objects these are the fundamental, basic objects upon which all other objects are based.
... error aggregateerror evalerror internalerror rangeerror referenceerror syntaxerror typeerror urierror numbers and dates these are the base objects representing numbers, dates, and mathematical calculations.
Logical OR assignment (||=) - JavaScript
syntax expr1 ||= expr2 description short-circuit evaluation the logical or operator works like this: x || y; // returns x when x is truthy // returns y when x is not truthy the logical or operator short-circuits: the second operand is only evaluated if the first operand doesn’t already determine the result.
... logical or assignment short-circuits as well, meaning it only performs an assignment if the logical operation would evaluate the right-hand side.
Property accessors - JavaScript
eval javascript novices often make the mistake of using eval() where the bracket notation can be used instead.
... x = eval('document.forms.form_name.elements.' + strformcontrol + '.value') eval() is slow and should be avoided whenever possible.
Unary plus (+) - JavaScript
the unary plus operator (+) precedes its operand and evaluates to its operand but attempts to convert it into a number, if it isn't already.
...if it cannot parse a particular value, it will evaluate to nan.
this - JavaScript
syntax this value a property of an execution context (global, function or eval) that, in non–strict mode, is always a reference to an object and in strict mode can be any value.
...calling super() creates a this binding within the constructor and essentially has the effect of evaluating the following line of code, where base is the inherited class: this = new base(); warning: referring to this before calling super() will throw an error.
yield - JavaScript
the value property is the result of evaluating the yield expression, and done is false, indicating that the generator function has not fully completed.
...'step' evaluates as a return value in this syntax [rv] = yield [expression] function* counter(value) { let step; while (true) { step = yield ++value; if (step) { value += step; } } } const generatorfunc = counter(0); console.log(generatorfunc.next().value); // 1 console.log(generatorfunc.next().value); // 2 console.log(generatorfunc.next().value); // 3 console.log(generatorfunc.nex...
Expressions and operators - JavaScript
equality operators the result of evaluating an equality operator is always of type boolean based on whether the comparison is true.
... comma operator , the comma operator allows multiple expressions to be evaluated in a single statement and returns the result of the last expression.
with - JavaScript
syntax with (expression) statement expression adds the given expression to the scope chain used when evaluating the statement.
...the 'with' statement adds the given object to the head of this scope chain during the evaluation of its statement body.
textLength - SVG: Scalable Vector Graphics
it starts by stashing references to the elements it will need to access, using document.getelementbyid(): const widthslider = document.getelementbyid("widthslider"); const widthdisplay = document.getelementbyid("widthdisplay"); const textelement = document.getelementbyid("hello"); const baselength = math.floor(textelement.textlength.baseval.value); widthslider.value = baselength; widthslider.addeventlistener("input", function(event) { textelement.textlength.baseval.newvaluespecifiedunits( svglength.svg_lengthtype_px, widthslider.valueasnumber); widthdisplay.innertext = widthslider.value; }, false); widthslider.dispatchevent(new event("input")); after fetching the element references, an eventlistener is established by...
...note that we have to dive into textlength to get its baseval property; textlength is stored as an svglength object, so we can't treat it like a plain number.
SVG Attribute reference - SVG: Scalable Vector Graphics
WebSVGAttribute
ring slope spacing specularconstant specularexponent speed spreadmethod startoffset stddeviation stemh stemv stitchtiles stop-color stop-opacity strikethrough-position strikethrough-thickness string stroke stroke-dasharray stroke-dashoffset stroke-linecap stroke-linejoin stroke-miterlimit stroke-opacity stroke-width style surfacescale systemlanguage t tabindex tablevalues target targetx targety text-anchor text-decoration text-rendering textlength to transform transform-origin type u u1 u2 underline-position underline-thickness unicode unicode-bidi unicode-range units-per-em v v-alphabetic v-hanging v-ideographic v-mathematical values vector-effect version vert-adv-y vert-origin-x vert-origin-y viewbox viewtarget visibili...
...p-opacity, stroke, stroke-dasharray, stroke-dashoffset, stroke-linecap, stroke-linejoin, stroke-miterlimit, stroke-opacity, stroke-width, text-anchor, text-decoration, text-rendering, transform, transform-origin, unicode-bidi, vector-effect, visibility, word-spacing, writing-mode filters attributes filter primitive attributes height, result, width, x, y transfer function attributes type, tablevalues, slope, intercept, amplitude, exponent, offset animation attributes animation attribute target attributes attributetype, attributename animation timing attributes begin, dur, end, min, max, restart, repeatcount, repeatdur, fill animation value attributes calcmode, values, keytimes, keysplines, from, to, by, autoreverse, accelerate, decelerate animation addition attributes additive, ac...
<feComponentTransfer> - SVG: Scalable Vector Graphics
width="100%" height="100%"> <fecomponenttransfer> <fefuncr type="identity"></fefuncr> <fefuncg type="identity"></fefuncg> <fefuncb type="identity"></fefuncb> <fefunca type="identity"></fefunca> </fecomponenttransfer> </filter> <filter id="table" x="0" y="0" width="100%" height="100%"> <fecomponenttransfer> <fefuncr type="table" tablevalues="0 0 1 1"></fefuncr> <fefuncg type="table" tablevalues="1 1 0 0"></fefuncg> <fefuncb type="table" tablevalues="0 1 1 0"></fefuncb> </fecomponenttransfer> </filter> <filter id="discrete" x="0" y="0" width="100%" height="100%"> <fecomponenttransfer> <fefuncr type="discrete" tablevalues="0 0 1 1"></fefuncr> <fefuncg type="discrete" tablevalues="...
...1 1 0 0"></fefuncg> <fefuncb type="discrete" tablevalues="0 1 1 0"></fefuncb> </fecomponenttransfer> </filter> <filter id="linear" x="0" y="0" width="100%" height="100%"> <fecomponenttransfer> <fefuncr type="linear" slope="0.5" intercept="0"></fefuncr> <fefuncg type="linear" slope="0.5" intercept="0.25"></fefuncg> <fefuncb type="linear" slope="0.5" intercept="0.5"></fefuncb> </fecomponenttransfer> </filter> <filter id="gamma" x="0" y="0" width="100%" height="100%"> <fecomponenttransfer> <fefuncr type="gamma" amplitude="4" exponent="7" offset="0"></fefuncr> <fefuncg type="gamma" amplitude="4" exponent="4" offset="0"></fefuncg> <fefuncb type="gamma" amplitude="4" exponent="1" offset="0"></fefuncb> ...
<switch> - SVG: Scalable Vector Graphics
WebSVGElementswitch
the <switch> svg element evaluates any requiredfeatures, requiredextensions and systemlanguage attributes on its direct child elements in order, and then renders the first child where these attributes evaluate to true.
... candidate recommendation clarified the evaluation of the systemlanguage attribute scalable vector graphics (svg) 1.1 (second edition)the definition of '<switch>' in that specification.
ceiling - XPath
xslt/xpath reference: xslt elements, exslt functions, xpath functions, xpath axes the ceiling function evaluates a decimal number and returns the smallest integer greater than or equal to the decimal number.
... syntax ceiling(number ) arguments number the number to be evaluated.
floor - XPath
WebXPathFunctionsfloor
xslt/xpath reference: xslt elements, exslt functions, xpath functions, xpath axes the floor function evaluates a decimal number and returns the largest integer less than or equal to the decimal number.
... syntax floor( number ) arguments number the decimal number to be evaluated.
last - XPath
WebXPathFunctionslast
xslt/xpath reference: xslt elements, exslt functions, xpath functions, xpath axes the last function returns a number equal to the context size from the expression evaluation context.
... syntax last() returns an integer equal to the context size from the expression evaluation context.
position - XPath
xslt/xpath reference: xslt elements, exslt functions, xpath functions, xpath axes the position function returns a number equal to the context position from the expression evaluation context.
... syntax position() returns an integer equal to the context position from the expression evaluation context.
sum - XPath
WebXPathFunctionssum
syntax sum(node-set ) arguments node-set the node-set to be evaluated.
... each node in this node-set is evaluated as if it were passed to the number() function, and a sum of the resulting numbers is returned.
translate - XPath
xslt/xpath reference: xslt elements, exslt functions, xpath functions, xpath axes the translate function evaluates a string and a set of characters to translate and returns the translated string.
... syntax translate(string, abc, xyz) arguments string the string to evaluate.
<xsl:if> - XSLT: Extensible Stylesheet Language Transformations
WebXSLTElementif
if the test evaluates to true, the template is processed.
... syntax <xsl:if test=expression> template </xsl:if> required attributes test contains an xpath expression that can be evaluated (using the rules defined for boolean( ) if necessary) to a boolean value.
<xsl:value-of> - XSLT: Extensible Stylesheet Language Transformations
WebXSLTElementvalue-of
xslt/xpath reference: xslt elements, exslt functions, xpath functions, xpath axes the <xsl:value-of> element evaluates an xpath expression, converts it to a string, and writes that string to the result tree.
... syntax <xsl:value-of select=expression disable-output-escaping="yes" | "no" /> required attributes select specifies the xpath expression to be evaluated and written to the output tree.
XSLT elements reference - XSLT: Extensible Stylesheet Language Transformations
WebXSLTElement
at run-time the expression is evaluated and the result of the evaluation is substituted for the xpath expression.
... for example, assume that a variable "image-dir" is defined as follows: <xsl:variable name="image-dir">/images</xsl:variable> the expression to be evaluated is placed inside curly brackets: <img src="{$image-dir}/mygraphic.jpg"/> this would result in the following: <img src="/images/mygraphic.jpg"/> the element annotations that follow include a description, a syntax listing, a list of required and optional attributes, a description of type and position, its source in the w3c recommendation and an explanation of the degree of present gecko support.
Index - XSLT: Extensible Stylesheet Language Transformations
WebXSLTIndex
if the test evaluates to true, the template is processed.
... 51 <xsl:value-of> element, reference, xslt, value-of the <xsl:value-of> element evaluates an xpath expression, converts it to a string, and writes that string to the result tree.
PI Parameters - XSLT: Extensible Stylesheet Language Transformations
the result of evaluating the expression is used as value for the parameter.
... set the parameter 'columns' to the number 2: <?xslt-param name="columns" select="2"?> set the parameter 'books' to a nodeset containing all <book> elements in the null namespace: <?xslt-param name="books" select="//book"?> set the parameter 'show-toc' to boolean true: <?xslt-param name="show-toc" select="true()"?> the select attribute context the following context is used to parse and evaluate the expression in the select attribute.
Content Scripts - Archive of obsolete content
event listeners you can listen for dom events in a content script just as you can in a normal page script, but there are two important differences: first, if you define an event listener by passing it as a string into setattribute(), then the listener is evaluated in the page's context, so it will not have access to any variables defined in the content script.
tabs - Archive of obsolete content
contentscript string,array a string or an array of strings of code to be evaluated in the context.
remote/parent - Archive of obsolete content
examples property retrieval this first example shows fetching a simple property from every existing and future process.
stylesheet/utils - Archive of obsolete content
istypevalid(type) verifies that the type given is a valid stylesheet's type.
Listening for Load and Unload - Archive of obsolete content
if your add-on exports a function called main(), that function will be called immediately after the overall main.js is evaluated, and after all top-level require() statements have run (so generally after all dependent modules have been loaded).
HTML to DOM - Archive of obsolete content
let's take a look at the donkeyfire.donkeybrowser_onpageload() handler: donkeybrowser_onpageload: function(aevent) { var doc = aevent.originaltarget; var url = doc.location.href; if (aevent.originaltarget.nodename == "#document") { // ok, it's a real page, let's do our magic dump("[df] url = "+url+"\n"); var text = doc.evaluate("/html/body/h1",doc,null,xpathresult.string_type,null).stringvalue; dump("[df] text in /html/body/h1 = "+text+"\n"); } }, as you can see, we obtain full access to the dom of the page we loaded in background, and we can even evaluate xpath expressions.
getAttributeNS - Archive of obsolete content
hile (thisitem.nodename !== '#document' && thisitem.nodename !== '#document-fragment') { attrs2 = thisitem.attributes; for (var i = 0; i < attrs2.length; i++) { // search for any prefixed xmlns declaration on thisitem which match prefixes found above with desired local name if (attrs2[i].nodename.match(xmlnsprefix) && attrs2[i].nodevalue === ns ) { // e.g., 'xmlns:xlink' and 'http://www.w3.org/1999/xlink' return attrs[j].nodevalue; } } thisitem = thisitem.parentnode; } } } return ''; // if not found (some implementations return 'null' but this is not standard) } alert(getattributenswrapper (someelement, 'http://www.w3.org/1999/xlink', 'h...
How to convert an overlay extension to restartless - Archive of obsolete content
in such cases, request.readystate == 4, request.status == 0 and request.response will evaluate to true.
Chapter 6: Firefox extensions and XUL applications - Archive of obsolete content
watched variables appear under the watches tab, and are updated every time they are evaluated.
Chapter 3: Introduction to XUL—How to build a more intuitive UI - Archive of obsolete content
<?xml version="1.0" encoding="utf-8"?> <?xml-stylesheet href="chrome://global/skin/"?> <dialog xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" title="my dialog" buttons="accept,cancel" ondialogaccept="savevalues(); window.close();" ondialogcancel="window.close();"> <checkbox label="my option"/> </dialog> listing 8: a dialog figure 5: output from listing 8 note: the functions behind the dialog elements discussed here require "xpconnect privileges," which are discussed in chapter 4, so this example will only run correctly if it can run as firefox code itself or installed extension code.
Setting Up a Development Environment - Archive of obsolete content
you can inspect variables, keep track of watch expressions, and evaluate arbitrary js at any point in execution.
XUL School Tutorial - Archive of obsolete content
intercepting page loads connecting to remote content handling preferences local storage advanced topics the box model xpcom objects observer notifications custom xul elements with xbl mozilla documentation roadmap useful mozilla community sites appendices appendix a: add-on performance appendix b: install and uninstall scripts appendix c: avoiding using eval in add-ons appendix d: loading scripts appendix e: dom building and html insertion appendix f: monitoring dom changes the xul school project was developed by appcoast (formerly glaxstar).
Setting up an extension development environment - Archive of obsolete content
chrome list navigate and view files in chrome:// (firefox version, thunderbird version) chrome edit plus a user file editor (firefox and thunderbird) firebug a variety of development tools (firefox) pentadactyl, a general purpose extension with builtin tools for extension development, including a command line with chrome javascript evaluation (including property and function argument completion) and the ability to demand-load external javascript and css files into window chrome.
MMgc - Archive of obsolete content
e following reasons: coordinating the marking thread and the main thread will require locking and may suffer due to lock overhead/contention supporting mac classic's cooperative threads makes this approach harder flash's frame based architecture gives us a very natural place to do this work we have better control over how much time is spent marking without threads when smp systems become more prevalent it may be worth investigating this approach because true parallelism may afford better performance.
MCD, Mission Control Desktop, AKA AutoConfig - Archive of obsolete content
ref", e); } test autoconfig debug to check that our autoconfig works fine, we just set to env variable to check the read of thunderbird.cfg file: $ 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!
Using content preferences - Archive of obsolete content
see also nsicontentprefservice nsicontentprefobserver tosource() (potentially useful for serializing objects for later use with eval()) ...
Embedding FAQ - Archive of obsolete content
how to customize document retrieval one method is to implement your own protocol method.
Storage - Archive of obsolete content
simple storage an easy-to-use persistent object data store file access interface for performing file i/o settings settings persist across browser sessions and are accessible to jetpacks via simple object retrieval and assignment.
Running Tamarin acceptance tests - Archive of obsolete content
0) $ tamarin-redux/platform/android/android_shell.py hello.abc hello exitcode=0 test it out by retrieving the version information of the shell on the android device $ $avm -dversion shell 1.4 debug build 6299:455bca954565 features avmsystem_32bit;avmsystem_unaligned_int_access;avmsystem_little_endian;avmsystem_arm;avmsystem_unix; avmfeature_jit;avmfeature_abc_interp;avmfeature_selftest;avmfeature_eval;avmfeature_protect_jitmem; avmfeature_shared_gcheap;avmfeature_cache_gqcn;avmfeature_safepoints;avmfeature_swf12;avmfeature_swf13;avmtweak_exact_tracing; running acceptance tests --androidthreads sets the number of threads to the number of phones found via usb.
Venkman Internals - Archive of obsolete content
scriptmanager.transients is a hash of all of the "transient" scripts from this url, where a transient script is something compiled as a the result of an eval, settimeout, or setinterval.
Elements - Archive of obsolete content
note: in firefox 3, fields are now evaluated the first time they're accessed instead of at binding attachment time.
Example Sticky Notes - Archive of obsolete content
the result of this code * evaluation (if any) will be used as initial value.
Methods - Archive of obsolete content
deletevalue removes the value of an arbitrary key.
XPInstall API reference - Archive of obsolete content
macalias moddate moddatechanged move remove rename size windowsgetshortname windowsregisterserver windowsshortcut winprofile no properties methods getstring writestring winreg no properties methods createkey deletekey deletevalue enumkeys enumvaluenames getvalue getvaluenumber getvaluestring iskeywritable keyexists setrootkey setvalue setvaluenumber setvaluestring valueexists winregvalue constructor other information return codes see complete list examples trigger scripts and install scripts code samples ...
right - Archive of obsolete content
this location is specified with respect to the right edge of the stack prior to the element being evaluated, or added to the stack.
Attribute Substitution - Archive of obsolete content
however, variables determined from a binding are evaluated using a much simpler process.
RDF Modifications - Archive of obsolete content
effectively, if the result generation process was to evaluate this member statement, the same output would be supplied for the ?photo variable whether the new data is there or not.
Recursive Generation - Archive of obsolete content
to begin, b is evaluated and seeded with the right value: (?start = http://www.xulplanet.com/rdf/b) the <triple> statement is then examined, however, item b doesn't have a relateditem arc out of it, so the result is rejected.
XML Assignments - Archive of obsolete content
note that while the query expression uses the root node (or reference node) as the xpath context, the expressions for the assign element are evaluated using each result node as the context.
SeaMonkey - making custom toolbar (SM ver. 1.x) - Archive of obsolete content
presss the return or enter key, or the evaluate button.
Adding Properties to XBL-defined Elements - Archive of obsolete content
actually, you can instead place a script inside the field tag that evaluates to the default value.
Creating a Window - Archive of obsolete content
choose tools – error console, type a line of javascript, and press the evaluate button, or the return or enter key.
XUL Questions and Answers - Archive of obsolete content
in addition i need to evaluate the browser contentdocument dom in order to clean "target" attributes on links, and so on.
conditions - Archive of obsolete content
when evaluating the rule for a particular rdf resource, the variables are replaced with values from the resource.
MacFAQ - Archive of obsolete content
ts[0]){ try { var cmdline = window.arguments[0] .queryinterface(components.interfaces.nsicommandline); for (var i = 0; i < cmdline.length; ++i) { debug(cmdline.getargument(i)) } } catch(ex) { debug(window.arguments[0]) // do something with window.arguments[0] //nspreferences.setunicharpref("myxul.cmdlinevalue", window.arguments[0]) } window.addeventlistener("load", checkotherwindows , false); } ]]></script> </window> ...
2006-09-29 - Archive of obsolete content
discussions extension based testing - someone is in the process of writing a small extension that tests firefox's help in terms of table-of-contents and search looking for firefox triagers to evaluate a triage tool - a phd student is working on a way to assist triagers.
2006-10-27 - Archive of obsolete content
discussions evalinsandbox and xmlhttprequest a discussion about writing something that calls a function defined by the page that the user is currently on chrome files and last modified date ways to retrieve the last modified date of a chrome file that may be in a jar or on the file system.
NPObject - Archive of obsolete content
functions npn_createobject() npn_retainobject() npn_releaseobject() npn_invoke() npn_invokedefault() npn_evaluate() npn_getproperty() npn_setproperty() npn_removeproperty() npn_hasproperty() npn_hasmethod() npn_setexception() see also npclass ...
NPAPI plugin reference - Archive of obsolete content
npn_evaluate evaluates a script in the scope of the specified npobject.
Scratchpad - Archive of obsolete content
s command windows macos linux open the scratchpad shift + f4 shift + f4 shift + f4 run scratchpad code ctrl + r cmd + r ctrl + r run scratchpad code, display the result in the object inspector ctrl + i cmd + i ctrl + i run scratchpad code, insert the result as a comment ctrl + l cmd + l ctrl + l re-evaluate current function ctrl + e cmd + e ctrl + e reload the current page, then run scratchpad code ctrl + shift + r cmd + shift + r ctrl + shift + r save the pad ctrl + s cmd + s ctrl + s open an existing pad ctrl + o cmd + o ctrl + o create a new pad ctrl + n cmd + n ctrl + n close scratchpad ctrl + w c...
Using the W3C DOM - Archive of obsolete content
useful references on changing an element's text using the dom whitespace in the dom by david baron element.innerhtml speed and performance comparison between innerhtml attribute and dom's nodevalue when modifying the text data of a text node by gérard talbot interactive dom level 2 characterdata interface attributes and methods tests: other ways to modify (replace, delete, manipulate) efficiently text nodes in the dom by gérard talbot <- previous section: using web standards: how next section: developing cross-browser pages -> ...
E4X for templating - Archive of obsolete content
0]}</description>, function _else () <label>no data</label> )} note that the simple xmllist() constructor (<></>) may be useful to still be able to use an expression closure (i.e., without needing return statements and braces): {_if(elems.length(), function () <> <markup/> <markup/> </>)} note that, while it is convenient to store such e4x in separate file templates (to be eval()d at a later time, taking into account security considerations, such as escaping with the above), e4x content using such functions can also be easily serialized inline (and then perhaps converted to the dom) as needed: var list = <>{_if(elems.length(), function () <> <markup/> <markup/> </>)}</>.toxmlstring(); iterating functions such as the following foreach (which can work wit...
Introduction - Archive of obsolete content
use of inline functions in content although the brackets are restricted to single statements for evaluation, one might provide an anonymous function to perform some extra processing inline: var a = 'foo'; var b = <bar>{function () {var c = a.touppercase(); var d = 5 * 5; return c + d;}()}</bar>; where the above produces: <bar>foo25</bar>.
Enumerator.moveFirst - Archive of obsolete content
example in following example, the movefirst method is used to evaluate members of the drivescollection from the beginning of the list: function showdrives() { var s = ""; var bytespergb = 1024 * 1024 * 1024; var fso = new activexobject("scripting.filesystemobject"); var e = new enumerator(fso.drives); e.movefirst(); while (e.atend() == false) { var drv = e.item(); s += drv.path + " - "; if (drv.isready) ...
New in JavaScript 1.1 - Archive of obsolete content
eval() is now a method of every object (was previously a built-in function); it evaluates a string of javascript code in the context of the specified object.
New in JavaScript 1.4 - Archive of obsolete content
new features in javascript 1.4 exception handling (throw and try...catch) in operator instanceof operator changed functionality in javascript 1.4 eval() changes (cannot be called indirectly and no longer a method of object) arguments not a property of functions deprecated function.arity in favor of function.length changes to liveconnect ...
ECMAScript 5 support in Mozilla - Archive of obsolete content
improvements laid out by ecmascript 5 have been made in the parsing algorithm that prevents evaluating xhtml as javascript code in certain circumstances.
Number.toInteger() - Archive of obsolete content
the number.tointeger() method used to evaluate the passed value and convert it to an integer, but its implementation has been removed.
JSException - Archive of obsolete content
source the string containing the javascript code being evaluated.
Writing JavaScript for XHTML - Archive of obsolete content
we can do this on server side by evaluating the http request header.
XForms Custom Controls - Archive of obsolete content
if aforceupdate is true then the * xforms model will rebuild/recalculate/revalidate/refresh.
XForms Output Element - Archive of obsolete content
attributes ui common appearance - the value of this attribute gives a hint to the xforms processor as to which type of widget(s) to use to represent this control accesskey - used to specify the keyboard shortcut for focusing this control single-node binding special value - xpath expression whose evaluation result is used as the output's value.
Using the Right Markup to Invoke Plugins - Archive of obsolete content
adding an additional layer of convenience in the form of automatic retrieval is the subject of a bug 180411 in the mozilla open source code.
Windows Media in Netscape - Archive of obsolete content
the windows media 9 series sdk doesn't provide a url to use with the codebase attribute for retrieval of the component in ie, and on netscape 7.1 the codebase attribute isn't supported for such retrieval.
XUL Parser in Python - Archive of obsolete content
or, since the dictionary is already storing the values of all the attributes it finds, you can write the values of a particular attribute (e.g., id) to the results file by checking the attribute in sys.argv[1]: for attr in a.keys(): if strip(attr) == sys.argv[1]: el_list[name][strip(attr)] = strip(a[attr]) and writing thevalues to the html results file instead of thekeys: for item in elements: w.write('<tr><td class="head">' + item + '</td></tr>\n') for a in el_list[item].values(): w.write('<tr><td class="at">' + a + '</td>') with these modifications, the script creates an output more like a periodic table of xul elements.
Async scripts for asm.js - Game development
instead of using eval or innerhtml, both of which trigger synchronous compilation, you should use a blob with an object url: var blob = new blob([codestring]); var script = document.createelement('script'); var url = url.createobjecturl(blob); script.onload = script.onerror = function() { url.revokeobjecturl(url); }; script.src = url; document.body.appendchild(script); the setting of src rather than innerhtml is wha...
Desktop gamepad controls - Game development
have you noticed that the current value of the axes is evaluated against 0.5?
Certified - MDN Web Docs Glossary: Definitions of Web-related terms
certified means that an application, content or data transmission has successfully undergone evaluation by professionals with expertise in the relevant field, thereby indicating completeness, security and trustworthiness.
Index - MDN Web Docs Glossary: Definitions of Web-related terms
69 certified apps, b2g, firefox os, glossary, security, trustworthy certified means that an application, content or data transmission has successfully undergone evaluation by professionals with expertise in the relevant field, thereby indicating completeness, security and trustworthiness.
Polyfill - MDN Web Docs Glossary: Definitions of Web-related terms
although this reason for polyfilling is very rare today, it was especially prevalent back in the days of ie6, netscape, and nnav where each browser implemented javascript very differently.
Primitive - MDN Web Docs Glossary: Definitions of Web-related terms
it correctly finds our variable instantiated with our first statement after finding it, the expression is evaluated, foo is replaced by 5 and the javascript engine passes that value to the functions as an argument before executing the statements inside the functions' bodies, javascript takes a copy of the originally passed argument (which is a primitive) and creates a local copy.
HTML: A good basis for accessibility - Learn web development
it is also much leaner and smaller in terms of code size, which means easier to maintain code, and less bandwidth for the user to download (particularly prevalent for those on slow connections).
HTML: A good basis for accessibility - Learn web development
it is also much leaner and smaller in terms of code size, which means easier to maintain code, and less bandwidth for the user to download (particularly prevalent for those on slow connections).
Accessible multimedia - Learn web development
last of all, add the following to the end of the code, to control the time elapsed display: player.ontimeupdate = function() { let minutes = math.floor(player.currenttime / 60); let seconds = math.floor(player.currenttime - minutes * 60); let minutevalue; let secondvalue; if (minutes<10) { minutevalue = "0" + minutes; } else { minutevalue = minutes; } if (seconds<10) { secondvalue = "0" + seconds; } else { secondvalue = seconds; } mediatime = minutevalue + ":" + secondvalue; timelabel.textcontent = mediatime; }; each time the time updates (once per second), we fire this function.
Debugging HTML - Learn web development
then try revalidating your html to show what errors are left.
Marking up a letter - Learn web development
a link to the example you want evaluated or need help with, in an online shareable editor (as mentioned in step 1 above).
Basic math in JavaScript — numbers and operators - Learn web development
operator precedence in javascript is the same as is taught in math classes in school — multiply and divide are always done first, then add and subtract (the calculation is always evaluated from left to right).
JavaScript object basics - Learn web development
we could get those values like this: let mydataname = nameinput.value; let mydatavalue = namevalue.value; we could then add this new member name and value to the person object like this: person[mydataname] = mydatavalue; to test this, try adding the following lines into your code, just below the closing curly brace of the person object: let mydataname = 'height'; let mydatavalue = '1.75m'; person[mydataname] = mydatavalue; now try saving and refreshing, and entering the following into y...
React interactivity: Editing, filtering, conditional rendering - Learn web development
when filter is all, for example, filter_map[filter] will evaluate to () => true.
Getting started with Svelte - Learn web development
using the svelte repl a repl (read–eval–print loop) is an interactive environment that allows you to enter commands and immediately see the results — many programming languages provide a repl.
Introduction to cross browser testing - Learn web development
testing on prerelease browsers it is often a good idea to test on prerelease versions of browsers; see the following links: firefox developer edition edge insider preview safari technology preview chrome canary opera developer this is especially prevalent if you are using very new technologies in your site, and you want to test against the latest implementations, or if you are coming across a bug in the latest release version of a browser, and you want to see if the browser's developers have fixed the bug in a newer version.
Chrome Worker Modules
however, if you have cyclic requirements, some of the modules involved in the cyclic requirements may become visible by the other modules before they are fully evaluated.
Links and Resources
wave 3.0 (web accessibility versatile evaluator) from webaim and sponsored by temple university institute on disabilities wave 3.0 is another powerful, mature, free online webpage accessibility validation service that identifies accessibility errors and reports accessibility warnings about webpage related to section 508 standards and/or the wcag guidelines.
How Mozilla's build system works
python 2 is prevalent in a mozilla build system.
Error codes returned by Mozilla APIs
ror_xpath_invalid_var_name (0x80600013) ns_error_xpath_unexpected_end (0x80600014) ns_error_xpath_operator_expected (0x80600015) ns_error_xpath_unclosed_literal (0x80600016) ns_error_xpath_bad_colon (0x80600017) ns_error_xpath_bad_bang (0x80600018) ns_error_xpath_illegal_char (0x80600019) ns_error_xpath_binary_expected (0x8060001a) ns_error_xpath_invalid_expression_evaluated (0x8060001c) ns_error_xpath_unbalanced_curly_brace (0x8060001d) xslt errors errors that can occur when using xslt.
HTMLIFrameElement.reload()
parameters hardreload optional a boolean that indicates whether all the resources to reload must be revalidated (true) or may be taken directly from the browser cache (false).
CSS -moz-bool-pref() @supports function
syntax -moz-bool-pref( <string> ) parameters <string> the preference name returns evaluates to true if the preference is enabled, false otherwise.
IPDL Tutorial
struct namevaluepair { nscstring name; nscstring value; }; in implementation code, these structs can be created and used like so: namevaluepair entry(astring, anotherstring); foo(entry.name(), entry.value()); // named accessor functions return references to the members arrays ipdl has simple syntax for arrays: invokemethod(nscstring[] args); in c++ this is translated into a nstarray reference: virt...
AddonUpdateChecker
error_security_error the update information was not signed by the update key used for retrieval.
AsyncShutdown.jsm
this function is evaluated during the phase and the phase is guaranteed to not terminate until the resulting promise is either resolved or rejected.
PromiseWorker.jsm
supported built-in javascript error are following: evalerror internalerror rangeerror referenceerror syntaxerror typeerror urierror in addition to them, stopiteration is also supported (note that stopiteration is deprecated).
Localization and Plurals
just put the following line somewhere that will be evaluated before you want to use pluralform.
Localization content best practices
this means that string changes are not allowed to land, and each case must be evaluated before landing.
Patching a Localization
alternatively, you can select specific files for diff to evaluate and print (see below).
Creating localizable web content
if there are alternatives, use them by adding the $lang; parameter in the urls evaluate the impact of new pages on all our web properties, especially links to community sites and redirects.
Mozilla Style System
the style contexts then provide the api for computed style data by allowing retrieval of a set of style structs, each of which contains the computed values of a set of css properties.
Optimizing Applications For NSPR
the implementation is well suited for high performance application, such as a server, but clients may find the win-95 version more suited (and adequate) for interactive applications such as are prevalent on today's workstations.
Hash Tables
hash table types and constants hash table functions hash table types and constants plhashentry plhashtable plhashnumber plhashfunction plhashcomparator plhashenumerator plhashallocops hash table functions pl_newhashtable pl_hashtabledestroy pl_hashtableadd pl_hashtableremove pl_hashtablelookup pl_hashtableenumerateentries pl_hashstring pl_comparestrings pl_comparevalues see also xpcom hashtable guide ...
PR_EnumerateHostEnt
evaluates each of the possible addresses of a prhostent structure, acquired from pr_gethostbyname or pr_gethostbyaddr.
PR_IntervalNow
prstatus rv; printervaltime epoch = pr_intervalnow(); pr_lock(data->mutex); while (!evaluatedata(data)) /* wait until condition is met */ { pruint32 delta = pr_intervaltomilliseconds(pr_intervalnow() - epoch); if (delta > interval) break; /* timeout */ rv = pr_wait(data->condition, pr_millisecondstointerval(interval - delta)); if (pr_failure == rv) break; /* likely an interrupt */ } pr_unlock(data->mutex); ...
Getting Started With NSS
some items that will be evaluated during code review are listed in checklist form on github.
NSS 3.16 release notes
bug 962760: libpkix should not include the common name of ca as dns names when evaluating name constraints.
NSS 3.44 release notes
bugs fixed in nss 3.44 1501542 - implement checkarmsupport for android 1531244 - use __builtin_bswap64 in crypto_primitives.h 1533216 - cert_decodecertpackage() crash with netscape certificate sequences 1533616 - sdb_getattributevaluenolock should make at most one sql query, rather than one for each attribute 1531236 - provide accessor for certcertificate.dercert 1536734 - lib/freebl/crypto_primitives.c assumes a big endian machine 1532384 - in nss test certificates, use @example.com (not @bogus.com) 1538479 - post-handshake messages after async server authentication break when using record layer separation 1521578 - x2...
NSS 3.52 release notes
bug 1612281 - maintain pkcs11 c_getattributevalue semantics on attributes that lack nss database columns.
Enc Dec MAC Using Key Wrap CertReq PKCS10 CSR
mtparameters, &printabletime); if ( warpmonths ) { printabletime.tm_month += warpmonths; now = pr_implodetime (&printabletime); pr_explodetime (now, pr_gmtparameters, &printabletime); } printabletime.tm_month += validitymonths; after = pr_implodetime (&printabletime); /* note that the time is now in micro-second unit */ validity = cert_createvalidity (now, after); if (validity) { cert = cert_createcertificate(serialnumber, (selfsign ?
sample2
to cleanup; } } now = pr_now(); pr_explodetime (now, pr_gmtparameters, &printabletime); if ( warpmonths ) { printabletime.tm_month += warpmonths; now = pr_implodetime (&printabletime); pr_explodetime (now, pr_gmtparameters, &printabletime); } printabletime.tm_month += validitymonths; after = pr_implodetime (&printabletime); /* note that the time is now in micro-second unit */ validity = cert_createvalidity (now, after); if (validity) { cert = cert_createcertificate(serialnumber, (selfsign ?
nss tech note2
bjects 1024[805ef10]: hsession = 0x1000001 1024[805ef10]: phobject = 0x806d810 1024[805ef10]: ulmaxobjectcount = 16 1024[805ef10]: pulobjectcount = 0xbffff38c 1024[805ef10]: *pulobjectcount = 0x1 1024[805ef10]: phobject[0] = 0xf6457d04 1024[805ef10]: rv = 0x0 1024[805ef10]: c_findobjectsfinal 1024[805ef10]: hsession = 0x1000001 1024[805ef10]: rv = 0x0 1024[805ef10]: c_getattributevalue 1024[805ef10]: hsession = 0x1000001 1024[805ef10]: hobject = 0xf6457d04 1024[805ef10]: ptemplate = 0xbffff2d0 1024[805ef10]: ulcount = 2 1024[805ef10]: cka_token = 0 [1] 1024[805ef10]: cka_label = 0 [20] 1024[805ef10]: rv = 0x0 1024[805ef10]: c_getattributevalue 1024[805ef10]: hsession = 0x1000001 1024[805ef10]: hobject = 0xf6457d04 1024[805ef10]: ptemplate = 0xbffff2d0 ...
PKCS11 FAQ
MozillaProjectsNSSPKCS11FAQ
if a pkcs #11 library reports that, for example, it does not support rsa signing operations, does nss expect to be able to pull an rsa private key off the token using the c_getattributevalue call and then do the operation in software?
Python binding for NSS
all nss/nspr python objects can print their current value by evaluting the python object in a string context or by using the python str() function.
FIPS mode of operation
fc_createobject fc_copyobject fc_destroyobject fc_getobjectsize fc_getattributevalue fc_setattributevalue fc_findobjectsinit fc_findobjects fc_findobjectsfinal encryption functions these functions support triple des and aes in ecb and cbc modes.
NSS tools : signver
MozillaProjectsNSStoolssignver
signver -v -s signature_file -i signed_file -d sql:/home/my/sharednssdb signaturevalid=yes printing signature data the -a option prints all of the information contained in a signature file.
Rhino optimization
note some language features (indirect calls to eval, use of the arguments property of function objects) were previously not supported in higher optimization levels.
Scripting Java
02 if we store the new object in a javascript variable, we can then call methods on it: js> f = new java.io.file("test.txt") test.txt js> f.exists() true js> f.getname() test.txt static methods and fields can be accessed from the class object itself: js> java.lang.math.pi 3.141592653589793 js> java.lang.math.cos(0) 1 in javascript, unlike java, the method by itself is an object and can be evaluated as well as being called.
Bytecodes
within the engine, all bytecode execute within a stack frame -- even global (top-level) and eval code has a stack frame associated with it.
BOOLEAN_TO_JSVAL
please use js::booleanvalue/js::truevalue/js::falsevalue instead in spidermonkey 45 or later.
JS::AutoSaveExceptionState
example // typical usage: bool ok = js::evaluate(cx, ...); autosaveexceptionstate savedexc(cx); ...
JS::BooleanValue
see also mxr id search for js::booleanvalue js::value js::truevalue js::falsevalue ...
JS::Compile
mxr id search for js::compile js::evaluate js::compileoffthread js::compilefunction js_decompilescript bug 771705 bug 1143793 -- removed obj parameter ...
JS::CompileFunction
mxr id search for js::compilefunction js::evaluate js::compile js::compileoffthread js_executescript js_decompilescript bug 771705 ...
JS::CompileOffThread
mxr id search for js::compileoffthread js::evaluate js::compile js::compilefunction js_decompilescript bug 897655 ...
JS::Float32Value
see also mxr id search for js::float32value js::value js::int32value js::doublevalue js::numbervalue js_numbervalue ...
JS::Handle
there are typedefs available for the main types: namespace js { typedef handle<jsfunction*> handlefunction; typedef handle<jsid> handleid; typedef handle<jsobject*> handleobject; typedef handle<jsscript*> handlescript; typedef handle<jsstring*> handlestring; typedef handle<js::symbol*> handlesymbol; // added in spidermonkey 38 typedef handle<value> handlevalue; } see also mxr id search for js::handle mxr id search for js::handlefunction mxr id search for js::handleid mxr id search for js::handleobject mxr id search for js::handlescript mxr id search for js::handlestring mxr id search for js::handlesymbol mxr id search for js::handlevalue js::rooted js::mutablehandle gc rooting guide bug 714647 bug 761391 - added js::handlescript bug...
JS::Int32Value
see also mxr id search for js::int32value js::value js::float32value js::doublevalue js::numbervalue js_numbervalue ...
JS::MutableHandle
s: namespace js { typedef mutablehandle<jsfunction*> mutablehandlefunction; typedef mutablehandle<jsid> mutablehandleid; typedef mutablehandle<jsobject*> mutablehandleobject; typedef mutablehandle<jsscript*> mutablehandlescript; typedef mutablehandle<jsstring*> mutablehandlestring; typedef mutablehandle<js::symbol*> mutablehandlesymbol; typedef mutablehandle<value> mutablehandlevalue; } see also mxr id search for js::mutablehandle mxr id search for js::mutablehandlefunction mxr id search for js::mutablehandleid mxr id search for js::mutablehandleobject mxr id search for js::mutablehandlescript mxr id search for js::mutablehandlestring mxr id search for js::mutablehandlesymbol mxr id search for js::mutablehandlevalue js::rooted js::handle gc rooting guide bug...
JS::NullValue
see also mxr id search for js::nullvalue js::value js::nullhandlevalue ...
JS::NumberValue
see also mxr id search for js::numbervalue js::value js::int32value js::float32value js::doublevalue js_numbervalue ...
JS::SourceBufferHolder
example size_t length = 512; char16_t* chars = static_cast<char16_t*>(js_malloc(sizeof(char16_t) * length)); js::sourcebufferholder srcbuf(chars, length, js::sourcebufferholder::giveownership); js::compile(cx, obj, options, srcbuf); see also mxr id search for js::sourcebufferholder js::compile js::compilefunction js::evaluate bug 987556 ...
JS::ToBoolean
syntax bool js::toboolean(js::handlevalue v) name type description v js::handlevalue the value to convert.
JS::ToPrimitive
syntax bool js::toprimitive(jscontext *cx, js::handleobject obj, jstype hint, js::mutablehandlevalue vp); name type description cx jscontext * the context in which to perform the conversion.
JS::UndefinedValue
see also mxr id search for js::undefinedvalue js::value js::undefinedhandlevalue ...
JS::Value
:value can be accessed using these member functions: js type js::value type tests constructor accessors mutators null val.isnull() js::nullvalue() n/a val.setnull() undefined val.isundefined() js::undefinedvalue() n/a val.setundefined() boolean val.isboolean(), val.istrue(), val.isfalse() js::booleanvalue(bool), js::truevalue(), js::falsevalue() val.toboolean() val.setboolean(bool) number val.isint32(), val.isdouble(), val.isnumber() js::numbervalue(any number type), js::int32value(int32_t), js::doublevalue(double), js::float32value(float) val.toint32(), val.todouble(), val.tonumber() val.setint32(int32_t), val.setnumber(uint32_t), val.setnumber(double) string val.isstring() ...
JSDeletePropertyOp
this will cause delete obj[id] to evaluate to false in non-strict mode code, and to throw a typeerror in strict mode code.
JSExnType
(lower bound) jsexn_err error jsexn_internalerr internalerror jsexn_evalerr evalerror jsexn_rangeerr rangeerror jsexn_referenceerr referenceerror jsexn_syntaxerr syntaxerror jsexn_typeerr typeerror jsexn_urierr urierror jsexn_limit (upper bound) description these types are part of a jserrorformatstring structure.
JSExtendedClass.wrappedObject
object.prototype.eval unwraps.
JSNewEnumerateOp
syntax typedef bool (* jsnewenumerateop)(jscontext *cx, js::handleobject obj, js::autoidvector &properties); // added in spidermonkeysidebar 38 typedef bool (* jsnewenumerateop)(jscontext *cx, js::handleobject obj, jsiterateop enum_op, js::mutablehandlevalue statep, js::mutablehandleid idp); // obsolete since jsapi 37 name type description cx jscontext * the context in which the enumeration is taking place.
JSNewResolveOp
jsresolve_with obsolete since javascript 1.8.8 the lookup is occurring for a name evaluated inside a with statement.
JSObjectPrincipalsFinder
the two debugger functions js_stackframeprincipals and js_evalframeprincipals also use this callback.
JSProtoKey
ch for jsproto_math jsproto_number number mxr search for jsproto_number jsproto_string string mxr search for jsproto_string jsproto_regexp regexp mxr search for jsproto_regexp jsproto_error error mxr search for jsproto_error jsproto_internalerror internalerror mxr search for jsproto_internalerror jsproto_evalerror evalerror mxr search for jsproto_evalerror jsproto_rangeerror rangeerror mxr search for jsproto_rangeerror jsproto_referenceerror referenceerror mxr search for jsproto_referenceerror jsproto_syntaxerror syntaxerror mxr search for jsproto_syntaxerror jsproto_typeerror typeerror mxr search for jsproto_typeerror ...
JS_BufferIsCompilableUnit
see also mxr id search for js_bufferiscompilableunit js::evaluate js::compile js::compileoffthread js::compilefunction js_decompilescript ...
JS_CompileScript
mxr id search for js_compilescript mxr id search for js_compileucscript js::evaluate js::compileoffthread js::compilefunction js_executescript js_decompilescript bug 1143793 -- removed obj parameter ...
JS_CompileScriptForPrincipals
see also mxr id search for js_compilescriptforprincipals mxr id search for js_compileucscriptforprincipals js::compile js_decompilescript js::evaluate js_executescript bug 938907 bug 805080 ...
JS_CompileUTF8File
mxr id search for js_compilefile js::compile js_decompilescript js::evaluate js_executescript bug 805080 ...
JS_CompileUTF8FileHandle
mxr id search for js_compileutf8filehandle js::compile js_decompilescript js::evaluate js_executescript bug 805080 ...
JS_DecompileScript
see also mxr id search for js_decompilescript js::compile js_compilescript js_decompilefunction js_destroyscript js::evaluate js_executescript bug 761723 ...
JS_GetFunctionFlags
jsfun_heavyweight the function uses language features such as closures, with, or eval that require extra work on the part of the interpreter.
JS_GetLocaleCallbacks
callback functions struct jslocalecallbacks { jslocaletouppercase localetouppercase; jslocaletolowercase localetolowercase; jslocalecompare localecompare; // not used #if expose_intl_api jslocaletounicode localetounicode; }; typedef bool (* jslocaletouppercase)(jscontext *cx, js::handlestring src, js::mutablehandlevalue rval); typedef bool (* jslocaletolowercase)(jscontext *cx, js::handlestring src, js::mutablehandlevalue rval); typedef bool (* jslocalecompare)(jscontext *cx, js::handlestring src1, js::handlestring src2, js::mutablehandlevalue rval); typedef bool (* jslocaletounicode)(jscontext *cx, const char *src, js::mutablehandlevalue rval); type description jsl...
JS_GetParent
the parent of a function created by evaluating a function declaration or function expression in a script depends on the lexical scope of the function.
JS_InitStandardClasses
these include all the standard ecmascript global properties defined in ecma 262-3 §15.1: array, boolean, date, decodeuri, decodeuricomponent, encodeuri, encodeuricomponent, error, eval, evalerror, function, infinity, isnan, isfinite, math, nan, number, object, parseint, parsefloat, rangeerror, referenceerror, regexp, string, syntaxerror, typeerror, undefined, and urierror as well as a few spidermonkey-specific globals, depending on compile-time options: escape, unescape, uneval, internalerror, script, xml, namespace, qname, file, generator, iterator, and stopiteration, as ...
JS_IsBuiltinFunctionConstructor
see also mxr id search for js_isbuiltinfunctionconstructor js_isbuiltinevalfunction bug 638312 ...
JS_LooselyEqual
see also mxr id search for js_looselyequal js_strictlyequal js_samevalue ...
JS_NumberValue
replacement to js_newnumbervalue, js_newdoublevalue, js_newdouble.
JS_SetOptions
mxr id search for jsoption_werror jsoption_varobjfix make js_evaluatescript() use the last object on its obj param's scope chain (that is, the global object) as the ecma "variables object".
JS_StrictlyEqual
see also mxr id search for js_strictlyequal js_looselyequal js_samevalue bug 1132045 -- use handle ...
Parser API
the syntax error object thrown by reflect.parse() has the same message property as the syntax error that would be thrown by eval(src).
SpiderMonkey 31
this is performed by calling the new js_init method before creating any runtimes or contexts and before compiling, evaluating, or executing any js script.
Split object
to enforce this rule: if this would evaluate to an inner object, it evaluates to the corresponding outer object instead.
TPS Tests
troubleshooting and debugging tips for writing and running tps tests tps evaluates the whole file in every phase, so any syntax error(s) in the file will get reported in phase 1, even though the error may not be in phase 1 itself.
WebReplayRoadmap
one important issue is that any side effects from evaluating expressions via the console or the debugger's watch expressions will not carry over when the tab resumes executing.
Zest runtimes
as zest is written in json it requires a runtime in order to be evaluated.
Mozinfo
unknown will evaluate as false in python: if not mozinfo.os: ...
ROLE_CELL
interfaces nsiaccessible nsisupports nsiaccessibletext nsiaccessiblehypertext nsiaccessibleeditabletext nsiaccessiblehyperlink nsiaccessibleselectable nsiaccessiblevalue nsiaccessnode mapped to at-spi: atk_role_table_cell atk: atk_role_list_item ua: nsaccessibilitygrouprole msaa/ia2: role_system_cell used by aria: gridcell xul: <listcell/> html: <td> ...
Using the Places annotation service
four functions are provided to get this information: getpageannotationinfo(auri, aname, aflags, aexpiration, amimetype, atype) getitemannotationinfo(aitemid, aname, aflags, aexpiration, amimetype, atype) getpageannotationtype(auri, aname); getitemannotationtype(aitemid, aname); the returned type will be one of the value_type constants in mozistoragevaluearray.idl: after bug 377066 the value_type_* type handling was changed to this: type_int32 = 1 type_double = 2 type_string = 3 type_binary = 4 type_int64 = 5 try { var value = annotationservice.getpageannotation(uri, "my_extension/some_annotation"); } catch(e) { // annotation does not exist } other functions getpageswithannotation(aname, resultcount, results); getitemswithann...
Accessing the Windows Registry Using XPCOM
removing registry keys and values to remove child keys and values from the registry, you can use the removechild() and removevalue() methods.
Introduction to XPCOM for the DOM
nsifoo2 *ifooptr2; ifooptr->queryinterface(ns_get_iid(nsifoo2), (void **)&ifooptr2); ns_get_iid is a macro that evaluates to the iid of the argument.
mozIStorageConnection
mozistoragevaluearray wraps an array of sql values, such as a result row.
mozIStorageProgressHandler
mozistoragevaluearray wraps an array of sql values, such as a result row.
mozIStorageRow
last changed in gecko 1.9.1 (firefox 3.5 / thunderbird 3.0 / seamonkey 2.0) inherits from: mozistoragevaluearray method overview nsivariant getresultbyindex(in unsigned long aindex); nsivariant getresultbyname(in autf8string aname); methods getresultbyindex() returns the value from a specific column in the row, using a zero-based index to identify the column.
nsIAccessibilityService
last changed in gecko 1.8 (firefox 1.5 / thunderbird 1.5 / seamonkey 1.0) inherits from: nsiaccessibleretrieval method overview nsiaccessible createouterdocaccessible(in nsidomnode anode); nsiaccessible createrootaccessible(in nsipresshell ashell, in nsidocument adocument); nsiaccessible createhtml4buttonaccessible(in nsisupports aframe); nsiaccessible createhypertextaccessible(in nsisupports aframe); nsiaccessible createhtmlbraccessible(in nsisupports aframe); nsiaccessible createhtmlbuttonaccessible(in nsisupports aframe); nsiaccessible createhtmlaccessiblebymarkup(in nsiframe aframe, in nsiweakreference aweakshell, in nsidomnode adomnode); nsiaccessible c...
nsIContentPrefCallback2
handleresult() for the retrieval methods, this is called once for each retrieved preference.
nsIContentSecurityPolicy
ldload(in unsigned long acontenttype, in nsiuri acontentlocation, in nsiuri arequestorigin, in nsisupports acontext, in acstring amimetypeguess, in nsisupports aextra); short shouldprocess(in unsigned long acontenttype, in nsiuri acontentlocation, in nsiuri arequestorigin, in nsisupports acontext, in acstring amimetype, in nsisupports aextra); attributes attribute type description allowseval boolean whether this policy allows eval and eval-like functions such as settimeout("code string", time).
nsIDBFolderInfo
imapunreadpendingmessages long knownartsset string locale astring mailboxname astring nummessages long numunreadmessages long sortorder nsmsgviewsortordervalue sorttype nsmsgviewsorttypevalue version unsigned long viewflags nsmsgviewflagstypevalue viewtype nsmsgviewtypevalue methods andflags() long andflags( in long flags ); parameters flags missing description return value missing description exceptions thrown missing exception missing descrip...
nsIDOMNode
nodevalue domstring ownerdocument nsidomdocument read only.
nsIDOMXPathException
see also introduction to using xpath in javascript document object model (dom) level 3 xpath specification nsidomxpathevaluator document.evaluate nsidomxpathresult ...
nsIEditor
void beginningofdocument(); void endofdocument(); drag/drop methods boolean candrag(in nsidomevent aevent); void dodrag(in nsidomevent aevent); void insertfromdrop(in nsidomevent aevent); node manipulation methods void setattribute(in nsidomelement aelement, in astring attributestr,in astring attvalue); boolean getattributevalue(in nsidomelement aelement, in astring attributestr, out astring resultvalue); void removeattribute(in nsidomelement aelement, in astring aattribute); void cloneattribute(in astring aattribute, in nsidomnode asourcenode); void cloneattributes(in nsidomnode destnode, in nsidomnode sourcenode); nsidomnode createnode(in astring tag, in nsidomnode parent, in long ...
nsIMsgDatabase
defaultviewflags nsmsgviewflagstypevalue readonly: defaultsorttype nsmsgviewsorttypevalue readonly: defaultsortorder nsmsgviewsortordervalue readonly: msghdrcachesize unsigned long folderstream nsioutputstream summaryvalid boolean methods open() opens a database folder.
nsIMsgFilterCustomAction
* * @param type the filter type * @param scope the search scope * * @return true if valid */ boolean isvalidfortype(in nsmsgfiltertypetype type, in nsmsgsearchscopevalue scope); /** * after the user inputs a particular action value for the action, determine * if that value is valid.
NS_ENSURE_ARG_POINTER
summary macro returns ns_error_invalid_pointer if the macro argument evaluates to false and shows a warning (ns_warning) in this case.
NS ENSURE SUCCESS
summary macro returns return-value if ns_failed(nsresult) evaluates to true, and shows a warning on stderr in that case.
NS ENSURE TRUE
summary macro returns return-value if expr evaluates to false.
Troubleshooting XPCOM components registration
you can be certain that a component has failed to register by going to the error console and evaluating components.classes["contract-id"].name where contract-id is your contract id.
Using IndexedDB in chrome
it, use the wantglobalproperties option in the sandbox constructor: var options = { "wantglobalproperties": ["indexeddb"] } var principal = cc["@mozilla.org/systemprincipal;1"].createinstance(ci.nsiprincipal); var sandbox = components.utils.sandbox(principal, options); // the sandbox will have access to indexeddb var sandboxscript = 'var req = indexeddb.open("my-database");'; components.utils.evalinsandbox(sandboxscript, sandbox); before firefox 33, you would access indexeddb from chrome code using the initwindowless method of the nsiindexeddatabasemanager service.
XPCOM ABI
to retrieve the abi of your firefox or thunderbird, open the error console (accessible through tools | error console) and evaluate the following javascript code: components.classes["@mozilla.org/xre/app-info;1"] .getservice(components.interfaces.nsixulruntime) .xpcomabi if either the cpu architecture or the c++ compiler are unknown, the application wouldn't have an xpcom abi string and attempts to get it will result in error ns_error_not_available.
Filelink Providers
for example, the hightail implementation provides the following function: function extraargs() { var usernamevalue = document.getelementbyid("username").value; return { "username": {type: "char", value: usernamevalue}, }; } in this example, the username value is read from the input, and then the specially-crafted object is returned.
Index
filter execution is done by evaluating the search terms using the core mailnews/base/search code, and then applying the filter hits when the search terms match.
Tips and Tricks from the newsgroups
f copied message by nsimsgcopyservice::copyfilemessage access the plain text content of the email body get information about attachment without selecting message repeat image display using css sprites scan for new messages at startup and manually scan a folder initiated by user force listeners to run consecutively to prevent pop messages from getting garbled during message retrieval ...
Using js-ctypes
sstr, jsstr.length); } // main var mycfstrs = { head: makecfstr('core foundation says...'), body: makecfstr('we just called the equivalent of the "standardalert carbon function" for 64bit osx from javascript!') }; var rez = cfusernotificationdisplaynotice(0, kcfusernotificationcautionalertlevel, null, null, null, mycfstrs.head, mycfstrs.body, null); console.info('rez:', rez, rez.tostring(), uneval(rez)); // cfusernotificationdisplaynotice does not block till user clicks dialog, it will return immediately if (rez.tostring() == '0') { console.log('notification was succesfully shown!!'); } else { console.error('failed to show notification...
ABI
return value a javascript expression that evaluates to the abi.
Scripting plugins - Plugins
ing npvariant npn_releasevariantvalue npn_getstringidentifier npn_getstringidentifiers npn_getintidentifier npn_identifierisstring npn_utf8fromidentifier npn_intfromidentifier npobject npn_construct (since firefox 3.0b1) npn_createobject npn_retainobject npn_releaseobject npn_invoke npn_invokedefault npn_enumerate (since mozilla 1.9a1) npn_evaluate npn_getproperty npn_setproperty npn_removeproperty npn_hasproperty npn_hasmethod npn_setexception npclass « previousnext » ...
Gecko Plugin API Reference - Plugins
methods the api extensions npstring npvariant npn_releasevariantvalue npn_getstringidentifier npn_getstringidentifiers npn_getintidentifier npn_identifierisstring npn_utf8fromidentifier npn_intfromidentifier npobject npn_createobject npn_retainobject npn_releaseobject npn_invoke npn_invokedefault npn_evaluate npn_getproperty npn_setproperty npn_removeproperty npn_hasproperty npn_hasmethod npn_setexception npclass structures npanycallbackstruct npbyterange npembedprint npevent npfullprint npp np_port npprint npprintcallbackstruct nprect npregion npsaveddata npsetwindowcallbackstruct npstream npwindow constants error codes resul...
Introduction to DOM Inspector - Firefox Developer Tools
the javascript object viewer also allows javascript to be evaluated by selecting the appropriate menuitem in the context menu.
Access debugging in add-ons - Firefox Developer Tools
window.addeventlistener("debugger:editorunloaded") relevant files: chrome://browser/content/devtools/debugger-controller.js chrome://browser/content/devtools/debugger-toolbar.js chrome://browser/content/devtools/debugger-view.js chrome://browser/content/devtools/debugger-panes.js unfortunately there is not yet any api to evaluate watches/expressions within the debugged scope, or highlight elements on the page that are referenced as variables in the debugged scope.
Examine, modify, and watch variables - Firefox Developer Tools
just click on the variable's current value and you'll be able to type there: watch an expression watch expressions are expressions that are evaluated each time execution pauses.
Set a conditional breakpoint - Firefox Developer Tools
when the program reaches the line, the debugger pauses only if the breakpoint's specified expression evaluates to true.
How to - Firefox Developer Tools
access debugging in add-onsbreaking on exceptionsdebug eval sourcesdisable breakpointsexamine, modify, and watch variableshighlight and inspect dom nodesignore a sourceopen the debuggerpretty-print a minified filesearchset a breakpointset a conditional breakpointset watch expressionsstep through codeuse a source mapuse watchpoints ...
UI Tour - Firefox Developer Tools
they will be evaluated when code execution is paused: variable tooltip hover on a variable show a tooltip with its value inside: call stack when the debugger's paused, you'll see a call stack: each level of the call stack gets a line, with the name of the function and the filename and line number.
The Firefox JavaScript Debugger - Firefox Developer Tools
step through code black box a source debug worker threads debug eval sources look at values you probably want to see the value of variables or expressions, either during execution or when it is paused.
All keyboard shortcuts - Firefox Developer Tools
d command windows macos linux open the scratchpad shift + f4 shift + f4 shift + f4 run scratchpad code ctrl + r cmd + r ctrl + r run scratchpad code, display the result in the object inspector ctrl + i cmd + i ctrl + i run scratchpad code, insert the result as a comment ctrl + l cmd + l ctrl + l re-evaluate current function ctrl + e cmd + e ctrl + e reload the current page, then run scratchpad code ctrl + shift + r cmd + shift + r ctrl + shift + r save the pad ctrl + s cmd + s ctrl + s open an existing pad ctrl + o cmd + o ctrl + o create a new pad ctrl + n cmd + n ctrl + n close scratchpad ctrl + w c...
Migrating from Firebug - Firefox Developer Tools
scripts executed via event handlers, eval(), new function(), etc.).
Network request details - Firefox Developer Tools
he results through a json validator): { "response headers (1.113 kb)": { "headers": [ { "name": "accept-ranges", "value": "bytes" }, { "name": "age", "value": "0" }, { "name": "backend-timing", "value": "d=74716 t=1560258099074460" }, { "name": "cache-control", "value": "private, must-revalidate, max-age=0" }, { "name": "content-disposition", "value": "inline; filename=api-result.js" }, { "name": "content-encoding", "value": "gzip" }, { "name": "content-length", "value": "673" }, { "name": "content-type", "value": "text/javascript; charset=utf-8" }, { "...
Tips - Firefox Developer Tools
cd switches the javascript evaluation context to a different iframe in the page.
Web Console UI Tour - Firefox Developer Tools
instant evaluation: when enabled, the interpreter displays the evaluated results of an expression, when possible, before you press enter to submit it.
about:debugging (before Firefox 68) - Firefox Developer Tools
you can set breakpoints, step through code, watch variables, evaluate code, and so on: registering workers at first, you won't see any workers listed under service workers or shared workers.
AnimationEffect.getComputedTiming() - Web APIs
syntax var currenttimevalues = animation.getcomputedtiming(); parameters none.
AudioListener - Web APIs
retrieval is done by accessing, for example, audiolistener.positionx, while setting the same property is done with audiolistener.positionx.value.
CSSKeywordValue - Web APIs
methods inherits methods from cssstylevalue.
CSSMathSum - Web APIs
a cssmathsum is the object type returned when the stylepropertymapreadonly.get() method is used on a css property whosevalue is created with a calc() function.
CSSRule - Web APIs
WebAPICSSRule
r future use 9 should be used to define color profiles in the future cssrule.namespace_rule 10 cssnamespacerule cssrule.counter_style_rule 11 csscounterstylerule cssrule.supports_rule 12 csssupportsrule cssrule.document_rule 13 cssdocumentrule cssrule.font_feature_values_rule 14 cssfontfeaturevaluesrule cssrule.viewport_rule 15 cssviewportrule cssrule.region_style_rule 16 cssregionstylerule cssrule.unknown_rule 0 cssunknownrule cssrule.charset_rule 2 csscharsetrule (removed in most browsers.) an up-to-date informal list of constants can be found on the csswg wiki.
CSSStyleDeclaration - Web APIs
returns the property value as a cssprimitivevalue or null for shorthand properties.
CSSUnitValue - Web APIs
constructor cssstylevalue.cssunitvalue() creates a new cssunitvalue object.
CSSUnparsedValue.CSSUnparsedValue() - Web APIs
syntax var cssunparsedvalue = new cssunparsedvalue(members) parameters members an array whose values must be either a usvstring or a cssvariablereferencevalue.
CSSUnparsedValue - Web APIs
custom properties are represented by cssunparsedvalue and var() references are represented using cssvariablereferencevalue.
CSSValue.cssValueType - Web APIs
css_primitive_value the value is a primitive value and an instance of the cssprimitivevalue interface can be obtained by using binding-specific casting methods on this instance of the cssvalue interface.
CSSValue - Web APIs
WebAPICSSValue
css_primitive_value the value is a primitive value and an instance of the cssprimitivevalue interface can be obtained by using binding-specific casting methods on this instance of the cssvalue interface.
Cache.addAll() - Web APIs
WebAPICacheaddAll
the request objects created during retrieval become keys to the stored response operations.
CanvasPattern.setTransform() - Web APIs
s = document.getelementbyid('canvas'); var ctx = canvas.getcontext('2d'); var textarea = document.getelementbyid('code'); var reset = document.getelementbyid('reset'); var edit = document.getelementbyid('edit'); var code = textarea.value; var svg1 = document.getelementbyid('svg1'); var matrix = svg1.createsvgmatrix(); function drawcanvas() { ctx.clearrect(0, 0, canvas.width, canvas.height); eval(textarea.value); } reset.addeventlistener('click', function() { textarea.value = code; drawcanvas(); }); edit.addeventlistener('click', function() { textarea.focus(); }) textarea.addeventlistener('input', drawcanvas); window.addeventlistener('load', drawcanvas); specifications specification status comment html living standardthe definition of 'canvaspattern.
CanvasRenderingContext2D.addHitRegion() - Web APIs
(); ctx.arc(100, 110, 50, 0, math.pi, false); ctx.stroke();</textarea> var canvas = document.getelementbyid("canvas"); var ctx = canvas.getcontext("2d"); var textarea = document.getelementbyid("code"); var reset = document.getelementbyid("reset"); var edit = document.getelementbyid("edit"); var code = textarea.value; function drawcanvas() { ctx.clearrect(0, 0, canvas.width, canvas.height); eval(textarea.value); } reset.addeventlistener("click", function() { textarea.value = code; drawcanvas(); }); edit.addeventlistener("click", function() { textarea.focus(); }); canvas.addeventlistener("mousemove", function(event){ if(event.region) { alert("ouch, my eye :("); } }); textarea.addeventlistener("input", drawcanvas); window.addeventlistener("load", drawcanvas); specifi...
CanvasRenderingContext2D.drawImage() - Web APIs
the specification permits any canvas image source (canvasimagesource), specifically, a cssimagevalue, an htmlimageelement, an svgimageelement, an htmlvideoelement, an htmlcanvaselement, an imagebitmap, or an offscreencanvas.
CanvasRenderingContext2D.miterLimit - Web APIs
0); ctx.linewidth = 15; ctx.lineto(100, 100); ctx.stroke();</textarea> var canvas = document.getelementbyid("canvas"); var ctx = canvas.getcontext("2d"); var textarea = document.getelementbyid("code"); var reset = document.getelementbyid("reset"); var edit = document.getelementbyid("edit"); var code = textarea.value; function drawcanvas() { ctx.clearrect(0, 0, canvas.width, canvas.height); eval(textarea.value); } reset.addeventlistener("click", function() { textarea.value = code; drawcanvas(); }); edit.addeventlistener("click", function() { textarea.focus(); }) textarea.addeventlistener("input", drawcanvas); window.addeventlistener("load", drawcanvas); screenshotlive sample specifications specification status comment html living standardthe definiti...
CanvasRenderingContext2D.scrollPathIntoView() - Web APIs
path(); ctx.rect(10, 10, 30, 30); ctx.scrollpathintoview();</textarea> var canvas = document.getelementbyid("canvas"); var ctx = canvas.getcontext("2d"); var textarea = document.getelementbyid("code"); var reset = document.getelementbyid("reset"); var edit = document.getelementbyid("edit"); var code = textarea.value; function drawcanvas() { ctx.clearrect(0, 0, canvas.width, canvas.height); eval(textarea.value); } reset.addeventlistener("click", function() { textarea.value = code; drawcanvas(); }); edit.addeventlistener("click", function() { textarea.focus(); }) textarea.addeventlistener("input", drawcanvas); window.addeventlistener("load", drawcanvas); specifications specification status comment html living standardthe definition of 'canvasrenderin...
Drawing text - Web APIs
aseline = "hanging"; ctx.stroketext("hello world", 0, 100);</textarea> var canvas = document.getelementbyid('canvas'); var ctx = canvas.getcontext('2d'); var textarea = document.getelementbyid('code'); var reset = document.getelementbyid('reset'); var edit = document.getelementbyid('edit'); var code = textarea.value; function drawcanvas() { ctx.clearrect(0, 0, canvas.width, canvas.height); eval(textarea.value); } reset.addeventlistener('click', function() { textarea.value = code; drawcanvas(); }); edit.addeventlistener('click', function() { textarea.focus(); }) textarea.addeventlistener('input', drawcanvas); window.addeventlistener('load', drawcanvas); advanced text measurements in the case you need to obtain more details about the text, the following method allows you to...
Document.cookie - Web APIs
WebAPIDocumentcookie
examples example #1: simple usage document.cookie = "name=oeschger"; document.cookie = "favorite_food=tripe"; function alertcookie() { alert(document.cookie); } <button onclick="alertcookie()">show cookies</button> example #2: get a sample cookie named test2 document.cookie = "test1=hello"; document.cookie = "test2=world"; const cookievalue = document.cookie .split('; ') .find(row => row.startswith('test2')) .split('=')[1]; function alertcookievalue() { alert(cookievalue); } <button onclick="alertcookievalue()">show cookie value</button> example #3: do something only once in order to use the following code, please replace all occurrences of the word dosomethingonlyonce (the name of the cookie) with a custom name.
Document.createExpression() - Web APIs
this method compiles an xpathexpression which can then be used for (repeated) evaluations.
Document.getElementsByTagNameNS() - Web APIs
(to accommodate explorer, one could call an xpath wrapper instead of the xpath in the function below (as explorer supports xpath with a different api), such as this wrapper class.) function getelementsbytagnamenswrapper (ns, elname, doc, context) { if (!doc) { doc = document; } if (!context) { context = doc; } var result = doc.evaluate('//*[local-name()="'+elname+'" and namespace-uri() = "'+ns+'"]', context, null, xpathresult.ordered_node_snapshot_type, null); var a = []; for(var i = 0; i < result.snapshotlength; i++) { a[i] = result.snapshotitem(i); } return a; } specifications specification status comment domthe definition of 'document.getelements...
DocumentOrShadowRoot.msElementsFromRect() - Web APIs
syntax object.mselementsfromrect(left, top, width, height, retval) parameters left [in] type: floating-point top[in] type: floating-point width[in] type: floating-point height [in] type: floating-point retval [out, reval] type: nodelist example to find all of the elements under a given point, use mselementsfrompoint(x, y).
Traversing an HTML table with JavaScript and DOM Interfaces - Web APIs
example: setting the background color of a paragraph getelementsbytagname(tagnamevalue) is a method available in any dom element or the root document element.
Event.timeStamp - Web APIs
WebAPIEventtimeStamp
</p> <p>timestamp: <span id="time">-</span></p> javascript function gettime(event) { var time = document.getelementbyid("time"); time.firstchild.nodevalue = event.timestamp; } document.body.addeventlistener("keypress", gettime); result reduced time precision to offer protection against timing attacks and fingerprinting, the precision of event.timestamp might get rounded depending on browser settings.
Cross-global fetch usage - Web APIs
this article explains an edge case that occurs with fetch (and potentially other apis exhibiting the same kind of resource retrieval behavior).
HTMLElement: beforeinput event - Web APIs
html <input placeholder="enter some text" name="name"/> <p id="values"></p> javascript const input = document.queryselector('input'); const log = document.getelementbyid('values'); input.addeventlistener('beforeinput', updatevalue); function updatevalue(e) { log.textcontent = e.target.value; } result specifications specification status ui eventsthe definition of 'beforeinput event' in that specification.
HTMLElement: change event - Web APIs
html <input placeholder="enter some text" name="name"/> <p id="log"></p> javascript const input = document.queryselector('input'); const log = document.getelementbyid('log'); input.addeventlistener('change', updatevalue); function updatevalue(e) { log.textcontent = e.target.value; } result specifications specification status html living standardthe definition of 'change' in that specification.
HTMLElement: input event - Web APIs
html <input placeholder="enter some text" name="name"/> <p id="values"></p> javascript const input = document.queryselector('input'); const log = document.getelementbyid('values'); input.addeventlistener('input', updatevalue); function updatevalue(e) { log.textcontent = e.target.value; } result specifications specification status html living standardthe definition of 'input event' in that specification.
HTMLImageElement.sizes - Web APIs
each source size descriptor is comprised of a media condition, then at least one whitespace character, then the source size value to use for the image when the media condition evaluates to true.
HTMLVideoElement.getVideoPlaybackQuality() - Web APIs
the data returned can be used to evaluate the quality of the video stream.
In depth: Microtasks and the JavaScript runtime environment - Web APIs
this is frequently referred to as a "local context." using the ill-advised eval() function also creates a new execution context.
IDBIndex.multiEntry - Web APIs
the multientry read-only property of the idbindex interface returns a boolean value that affects how the index behaves when the result of evaluating the index's key path yields an array.
IDBIndex - Web APIs
WebAPIIDBIndex
idbindex.multientry read only affects how the index behaves when the result of evaluating the index's key path yields an array.
IDBKeyRange.includes() - Web APIs
example var keyrangevalue = idbkeyrange.bound('a', 'k', false, false); var myresult = keyrangevalue.includes('f'); // returns true var myresult = keyrangevalue.includes('w'); // returns false polyfill the includes() method was added in the second edition of the indexed db specification.
IDBLocaleAwareKeyRange - Web APIs
examples function displaydata() { var keyrangevalue = idblocaleawarekeyrange.bound("a", "f"); var transaction = db.transaction(['fthings'], 'readonly'); var objectstore = transaction.objectstore('fthings'); var myindex = objectstore.index('lname'); myindex.opencursor(keyrangevalue).onsuccess = function(event) { var cursor = event.target.result; if(cursor) { var tablerow = document.createelement('tr'); tablerow.inner...
IDBObjectStore - Web APIs
this sorting enables fast insertion, look-up, and ordered retrieval.
MSSiteModeEvent - Web APIs
eventphase gets the event phase that is being evaluated.
MediaQueryList - Web APIs
when the media query test starts or stops evaluating to true).
MediaQueryListListener - Web APIs
a mediaquerylistlistener is a callback function that gets invoked with a single argument, the mediaquerylist for which the evaluated result changed.
MouseEvent.buttons - Web APIs
html <p>click anywhere with one or more mouse buttons.</p> <pre id="log">buttons: </pre> javascript let log = document.createtextnode('?'); // let log = new text('?'); function logbuttons(e) { log.data = `${e.buttons} (${e.type})`; // log.nodevalue= `${e.buttons} (${e.type})`; } document.addeventlistener('mouseup', logbuttons); document.addeventlistener('mousedown', logbuttons); // document.addeventlistener('mousemove', logbuttons); document.queryselector('#log').appendchild(log) result specifications specification status comment document object model (dom) level 3 events specificationthe definition of 'mous...
Node.textContent - Web APIs
WebAPINodetextContent
if the node is a cdata section, comment, processing instruction, or text node, textcontent returns the text inside the node, i.e., the node.nodevalue.
Node - Web APIs
WebAPINode
ute_node 2 text_node 3 cdata_section_node 4 entity_reference_node 5 entity_node 6 processing_instruction_node 7 comment_node 8 document_node 9 document_type_node 10 document_fragment_node 11 notation_node 12 node.nodevalue returns / sets the value of the current node.
NodeFilter - Web APIs
a nodefilter knows nothing about the document or traversing nodes; it only knows how to evaluate a single node against the provided filter.
PannerNode - Web APIs
retrieval is done by accessing, for example, pannernode.positionx.
PaymentResponse - Web APIs
allows the developer to revalidate any requested user data (e.g., the phone number or the email address) if it changes.
PerformanceResourceTiming.domainLookupEnd - Web APIs
if the user agent has the domain information in cache, domainlookupstart and domainlookupend represent the times when the user agent starts and ends the domain data retrieval from the cache.
PerformanceResourceTiming - Web APIs
the performanceresourcetiming interface enables retrieval and analysis of detailed network timing data regarding the loading of an application's resources.
PublicKeyCredentialRequestOptions.allowCredentials - Web APIs
allowcredentials is an optional property of the publickeycredentialrequestoptions dictionary which indicates the existing credentials acceptable for retrieval.
PublicKeyCredentialRequestOptions.timeout - Web APIs
the timeout property, of the publickeycredentialrequestoptions dictionary, represents an hint, given in milliseconds, for the time the script is willing to wait for the completion of the retrieval operation.
RTCConfiguration.iceTransportPolicy - Web APIs
relay the ice agent only considers media relay candidates when evaluating candidates.
Range.setStart() - Web APIs
WebAPIRangesetStart
main st.<br> dodge city, ks<br> 67801<br> usa</p> <hr> <p>nodes in the original address:</p> <ol id="log"></ol> javascript const address = document.getelementbyid('address'); const log = document.getelementbyid('log'); // log info address.childnodes.foreach(node => { const li = document.createelement('li'); li.textcontent = `${node.nodename}, ${node.nodevalue}`; log.appendchild(li); }); // highlight the street and city const startoffset = 2; // start at third node: 101 e.
Request.cache - Web APIs
WebAPIRequestcache
fetch("some.json", {cache: "force-cache"}) .then(function(response) { /* consume the response */ }); // naive stale-while-revalidate client-level implementation.
SVGAngle - Web APIs
WebAPISVGAngle
every svgangle object operates in one of two modes: reflect the base value of a reflected animatable attribute (being exposed through the baseval member of an svganimatedangle), be detached, which is the case for svgangle objects created with svgsvgelement.createsvgangle().
SVGCircleElement - Web APIs
10 : -10; // clamp the circle radius to a minimum of 10 and a maximum of 250, // so it won't disappear or get bigger than the viewport var newvalue = math.min(math.max(circle.r.baseval.value + change, 10), 250); circle.setattribute("r", newvalue); } click on the circle.
SVGComponentTransferFunctionElement - Web APIs
svgcomponenttransferfunctionelement.tablevalues read only an svganimatednumberlist corresponding to the tablevalues attribute of the given element.
SVGEllipseElement - Web APIs
example svg content <svg width="200" height="200" xmlns="http://www.w3.org/2000/svg"> <ellipse cx="100" cy="100" rx="100" ry="60" id="ellipse" onclick="outputsize();"/> </svg> javascript content function outputsize() { var ellipse = document.getelementbyid("ellipse"); // outputs "horizontal radius: 100 vertical radius: 60" console.log( 'horizontal radius: ' + ellipse.rx.baseval.valueasstring, 'vertical radius: ' + ellipse.ry.baseval.valueasstring ) } result specifications specification status comment scalable vector graphics (svg) 2the definition of 'svgellipseelement' in that specification.
SVGExternalResourcesRequired - Web APIs
because the svg language definition states that externalresourcesrequired cannot be animated, the animval will always be the same as the baseval.
SVGLength - Web APIs
WebAPISVGLength
e_mm = 7 svg_lengthtype_in = 8 svg_lengthtype_pt = 9 svg_lengthtype_pc = 10 normative document svg 1.1 (2nd edition) example <svg height="200" onload="start();" version="1.1" width="200" xmlns="http://www.w3.org/2000/svg"> <script type="text/javascript"><![cdata[ function start() { var rect = document.getelementbyid("myrect"); var val = rect.x.baseval; // read x in pixel and cm units console.log("value: " + val.value + ", valueinspecifiedunits: " + val.unittype + ": " + val.valueinspecifiedunits + ", valueasstring: " + val.valueasstring); // set x = 20pt and read it out in pixel and pt units val.newvaluespecifiedunits(svglength.svg_lengthtype_pt, 20); console.log("value: " + val.value + ", valuei...
SVGTransformList - Web APIs
<desc>example showing how to transform svg elements that using svgtransform objects</desc> <script type="application/ecmascript"> <![cdata[ function transformme(evt) { // svg root element to access the createsvgtransform() function var svgroot = evt.target.parentnode; // svgtransformlist of the element that has been clicked on var tfmlist = evt.target.transform.baseval; // create a seperate transform object for each transform var translate = svgroot.createsvgtransform(); translate.settranslate(50,5); var rotate = svgroot.createsvgtransform(); rotate.setrotate(10,0,0); var scale = svgroot.createsvgtransform(); scale.setscale(0.8,0.8); // apply the transformations by appending the svgtranform objects to the svgt...
Screen.availLeft - Web APIs
WebAPIScreenavailLeft
if you work with two screens this property, evaluated on the right screen, returns the width of the left one in pixels (thereby indicating the x coordinate of the left edge of the screen on the right).
SpeechSynthesis - Web APIs
var synth = window.speechsynthesis; var inputform = document.queryselector('form'); var inputtxt = document.queryselector('.txt'); var voiceselect = document.queryselector('select'); var pitch = document.queryselector('#pitch'); var pitchvalue = document.queryselector('.pitch-value'); var rate = document.queryselector('#rate'); var ratevalue = document.queryselector('.rate-value'); var voices = []; function populatevoicelist() { voices = synth.getvoices(); for(i = 0; i < voices.length ; i++) { var option = document.createelement('option'); option.textcontent = voices[i].name + ' (' + voices[i].lang + ')'; if(voices[i].default) { option.textcontent += ' -- default'; } option.setattribute('data-lang...
StylePropertyMapReadOnly - Web APIs
stylepropertymapreadonly.getall() returns an array of cssstylevalue objects containing the values for the provided property.
A basic 2D WebGL animation example - Web APIs
function compileshader(id, type) { let code = document.getelementbyid(id).firstchild.nodevalue; let shader = gl.createshader(type); gl.shadersource(shader, code); gl.compileshader(shader); if (!gl.getshaderparameter(shader, gl.compile_status)) { console.log(`error compiling ${type === gl.vertex_shader ?
WebGL best practices - Web APIs
for unchanged vaos, browsers can cache the fetch limits, whereas when vaos change, browsers must revalidate and recalculate limits.
WebRTC connectivity - Web APIs
when changing the description by calling setlocaldescription() or setremotedescription(), the specified description is set as the pending description, and the webrtc layer begins to evaluate whether or not it's acceptable.
Functions and classes available to Web Workers - Web APIs
34.0 (34.0) no support 33.0 no support performanceentry, performancemeasure, performancemark, performanceobserver, performanceresourcetiming enables retrieval and analysis of detailed data regarding various aspects of an application's network performance.
Window: error event - Web APIs
m; } img { width: 0; height: 0; } js const log = document.queryselector('.event-log-contents'); window.addeventlistener('error', (event) => { log.textcontent = log.textcontent + `${event.type}: ${event.message}\n`; console.log(event) }); const scripterror = document.queryselector('#script-error'); scripterror.addeventlistener('click', () => { const badcode = 'const s;'; eval(badcode); }); result specifications specification status ui events working draft ...
Window.frames - Web APIs
WebAPIWindowframes
framelist === window evaluates to true.
XPathException - Web APIs
constants constant value description invalid_expression_err 51 if the expression has a syntax error or otherwise is not a legal expression according to the rules of the specific xpathevaluator or contains specialized extension functions or variables not supported by this implementation.
XPathNSResolver.lookupNamespaceURI() - Web APIs
the lookupnamespaceuri method looks up the namespace uri associated to the given namespace prefix within an xpath expression evaluated by the xpathevaluator interface.
XPathNSResolver - Web APIs
the xpathevaluator interface can construct an implementation of xpathnsresolver from a node, or the interface may be implemented by any application.
XPathResult.invalidIteratorState - Web APIs
html <div>xpath example</div> <p>iterator state: <output></output></p> javascript var xpath = "//div"; var result = document.evaluate(xpath, document, null, xpathresult.any_type, null); // invalidates the iterator state document.queryselector("div").remove(); document.queryselector("output").textcontent = result.invaliditeratorstate ?
XPathResult.iterateNext() - Web APIs
html <div>xpath example</div> <div>tag names of the matched nodes: <output></output></div> javascript var xpath = "//div"; var result = document.evaluate(xpath, document, null, xpathresult.any_type, null); var node = null; var tagnames = []; while(node = result.iteratenext()) { tagnames.push(node.localname); } document.queryselector("output").textcontent = tagnames.join(", "); result specifications specification status comment document object model (dom) level 3 xpath specificationthe definition of 'xpathresult.
XPathResult.snapshotItem() - Web APIs
html <div>xpath example</div> <div>tag names of the matched nodes: <output></output></div> javascript var xpath = "//div"; var result = document.evaluate(xpath, document, null, xpathresult.ordered_node_snapshot_type, null); var node = null; var tagnames = []; for(var i = 0; i < result.snapshotlength; i++) { var node = result.snapshotitem(i); tagnames.push(node.localname); } document.queryselector("output").textcontent = tagnames.join(", "); result specifications specification status comment document object mod...
XPathResult.snapshotLength - Web APIs
html <div>xpath example</div> <div>number of matched nodes: <output></output></div> javascript var xpath = "//div"; var result = document.evaluate(xpath, document, null, xpathresult.ordered_node_snapshot_type, null); document.queryselector("output").textcontent = result.snapshotlength; result specifications specification status comment document object model (dom) level 3 xpath specificationthe definition of 'xpathresult.snapshotlength' in that specification.
msGetRegionContent - Web APIs
syntax var retval = element.msgetregioncontent(); parameters retval [out, reval] type: msrangecollection the name of the property to enable.
Web applications and ARIA FAQ - Accessibility
other helpful testing tools and techniques for aria-enabled applications and widgets: yahoo!'s aria bookmarklets fluid project's simple accessibility evaluation techniques where do aria discussions happen?
prefers-contrast - CSS: Cascading Style Sheets
this keyword value evaluates as false in a boolean context.
prefers-reduced-data - CSS: Cascading Style Sheets
this keyword value evaluates as false in the boolean context.
prefers-reduced-transparency - CSS: Cascading Style Sheets
this keyword value evaluates as false in the boolean context.
border-width - CSS: Cascading Style Sheets
gthborder-left-width: a lengthborder-right-width: a lengthborder-top-width: a length formal syntax <line-width>{1,4}where <line-width> = <length> | thin | medium | thick examples a mix of values and lengths html <p id="sval"> one value: 6px wide border on all 4 sides</p> <p id="bival"> two different values: 2px wide top and bottom border, 10px wide right and left border</p> <p id="treval"> three different values: 0.3em top, 9px bottom, and zero width right and left</p> <p id="fourval"> four different values: "thin" top, "medium" right, "thick" bottom, and 1em left</p> css #sval { border: ridge #ccc; border-width: 6px; } #bival { border: solid red; border-width: 2px 10px; } #treval { border: dotted orange; border-width: 0.3em 0 9px; } #fourval { border: sol...
box-lines - CSS: Cascading Style Sheets
WebCSSbox-lines
each line computes flexes independently, so only elements on that line are considered when evaluating box-flex and box-flex-groups.
clamp() - CSS: Cascading Style Sheets
WebCSSclamp
the expressions can be math functions (see calc() for more information), literal values, or other expressions, such as attr(), that evaluate to a valid argument type (like <length>), or nested min() and max() functions.
hue-rotate() - CSS: Cascading Style Sheets
there is no minimum or maximum value; hue-rotate(ndeg) evaluates to n modulo 360.
max() - CSS: Cascading Style Sheets
WebCSSmax
the expressions can be math expressions (using arithmetic operators), literal values, or other expressions, such as attr(), that evaluate to a valid argument type (like <length>), or nested min() and max() functions.
min() - CSS: Cascading Style Sheets
WebCSSmin
the expressions can be math expressions (using arithmetic operators), literal values, or other expressions, such as attr(), that evaluate to a valid argument type (like <length>).
regexp:match() - EXSLT
WebEXSLTregexpmatch
regexpstring the javascript style regular expression to evaluate.
regexp:replace() - EXSLT
WebEXSLTregexpreplace
regexpstring the javascript style regular expression to evaluate.
regexp:test() - EXSLT
WebEXSLTregexptest
regexpstring the javascript style regular expression to evaluate.
Constraint validation - Developer guides
the constraint validation is done in the following ways: by a call to the checkvalidity() or reportvalidity() method of a form-associated dom interface, (htmlinputelement, htmlselectelement, htmlbuttonelement, htmloutputelement or htmltextareaelement), which evaluates the constraints only on this element, allowing a script to get this information.
HTML5 - Developer guides
WebGuideHTMLHTML5
performance and integration web workers allows delegation of javascript evaluation to background threads, allowing these activities to prevent slowing down interactive events.
Localizations and character encodings - Developer guides
unfortunately, using utf-8 and declaring that utf-8 was used was not always the prevalent way of offering web content.
Allowing cross-origin use of images and canvas - HTML: Hypertext Markup Language
implementing the save feature now that the server has been configured to allow retrieval of the images cross-origin, we can write the code that allows the user to save them to local local storage, just as if they were being served from the same domain the code is running on.
HTML documentation index - HTML: Hypertext Markup Language
WebHTMLIndex
226 link types: modulepreload attribute, html, link, link types, reference the modulepreload keyword for the rel attribute of the <link> element provides a declarative way to preemptively fetch a module script and its dependencies, and store them in the document's module map for later evaluation.
Link types: modulepreload - HTML: Hypertext Markup Language
the modulepreload keyword for the rel attribute of the <link> element provides a declarative way to preemptively fetch a module script and its dependencies, and store them in the document's module map for later evaluation.
Evolution of HTTP - HTTP
this allowed any web application to provide an api to allow retrieval and modification of its data without having to update the browsers or the servers: all what is needed was embedded in the files served by the web sites through standard http/1.1.
Content Security Policy (CSP) - HTTP
WebHTTPCSP
a policy needs to include a default-src or script-src directive to prevent inline scripts from running, as well as blocking the use of eval().
CSP: base-uri - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: block-all-mixed-content - HTTP
the upgrade-insecure-requests directive is evaluated before block-all-mixed-content.
CSP: child-src - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: connect-src - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: default-src - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: font-src - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: form-action - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: frame-ancestors - HTTP
default-src), but doesn't allow 'unsafe-eval' or 'unsafe-inline' for example.
CSP: frame-src - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: img-src - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: manifest-src - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: media-src - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: navigate-to - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: object-src - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: prefetch-src - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: script-src-attr - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: script-src-elem - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: style-src-attr - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: style-src-elem - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
CSP: upgrade-insecure-requests - HTTP
the upgrade-insecure-requests directive is evaluated before block-all-mixed-content and if it is set, the latter is effectively a no-op.
CSP: worker-src - HTTP
'unsafe-eval' allows the use of eval() and similar methods for creating code from strings.
Link prefetching FAQ - HTTP
however, it is possible to instruct mozilla to validate a prefetched document when the user follows a href to the prefetched document by specifying the cache-control: must-revalidate http response header.
Redirections in HTTP - HTTP
304 not modified sent for revalidated conditional requests.
A typical HTTP session - HTTP
WebHTTPSession
(contains a site-customized page helping the user to find the missing resource) notification that the requested resource doesn't exist: http/1.1 404 not found content-type: text/html; charset=utf-8 content-length: 38217 connection: keep-alive cache-control: no-cache, no-store, must-revalidate, max-age=0 content-language: en-us date: thu, 06 dec 2018 17:35:13 gmt expires: thu, 06 dec 2018 17:35:13 gmt server: meinheld/0.6.1 strict-transport-security: max-age=63072000 x-content-type-options: nosniff x-frame-options: deny x-xss-protection: 1; mode=block vary: accept-encoding,cookie x-cache: error from cloudfront <!doctype html...
About JavaScript - JavaScript
javascript's dynamic capabilities include runtime object construction, variable parameter lists, function variables, dynamic script creation (via eval), object introspection (via for ...
Details of the object model - JavaScript
new workerbee; public class engineer extends workerbee { public string machine; public engineer () { dept = "engineering"; machine = ""; } public engineer (string mach) { dept = "engineering"; machine = mach; } } these javascript definitions use a special idiom for setting default values: this.name = name || ''; the javascript logical or operator (||) evaluates its first argument.
Indexed collections - JavaScript
the simplest way to do this is as follows: let colors = ['red', 'green', 'blue'] for (let i = 0; i < colors.length; i++) { console.log(colors[i]) } if you know that none of the elements in your array evaluate to false in a boolean context—if your array consists only of dom nodes, for example—you can use a more efficient idiom: let divs = document.getelementsbytagname('div') for (let i = 0, div; div = divs[i]; i++) { /* process div in some way */ } this avoids the overhead of checking the length of the array, and ensures that the div variable is reassigned to the current item each time aro...
Text formatting - JavaScript
for example: const firststring = '2 + 2'; // creates a string literal value const secondstring = new string('2 + 2'); // creates a string object eval(firststring); // returns the number 4 eval(secondstring); // returns the string "2 + 2" a string object has one property, length, that indicates the number of utf-16 code units in the string.
Private class fields - JavaScript
class classwithprivatestaticfield { static #private_static_field static publicstaticmethod() { classwithprivatestaticfield.#private_static_field = 42 return classwithprivatestaticfield.#private_static_field } } console.assert(classwithprivatestaticfield.publicstaticmethod() === 42) private static fields are added to the class constructor at class evaluation time.
Deprecated and obsolete features - JavaScript
object.prototype.eval() evaluates a string of javascript code in the context of the specified object.
TypeError: invalid 'instanceof' operand 'x' - JavaScript
unction foo() {} var f = foo(); // foo() is called and returns undefined var x = new foo(); x instanceof f; // typeerror: invalid 'instanceof' operand f x instanceof x; // typeerror: x is not a function to fix these errors, you will either need to replace the instanceof operator with the typeof operator, or to make sure you use the function name, instead of the result of its evaluation.
Arrow function expressions - JavaScript
https://www.ecma-international.org/ecma-262/10.0/index.html#sec-strict-mode-code https://www.ecma-international.org/ecma-262/10.0/index.html#sec-arrow-function-definitions-runtime-semantics-evaluation correction: end invoked through call or apply since arrow functions do not have their own this, the methods call() and apply() can only pass in parameters.
Functions - JavaScript
each must be a string that conforms to the rules for a valid javascript identifier or a list of such strings separated with a comma; for example "x", "thevalue", or "a,b".
Array.prototype.every() - JavaScript
this algorithm is exactly the one specified in ecma-262, 5th edition, assuming object and typeerror have their original values, and that callbackfn.call evaluates to the original value of function.prototype.call.
Array.prototype.filter() - JavaScript
this algorithm is exactly equivalent to the one specified in ecma-262, 5th edition, assuming that fn.call evaluates to the original value of function.prototype.bind(), and that array.prototype.push() has its original value.
Array.from() - JavaScript
polyfill notes: this algorithm is exactly as specified in ecma-262 6th edition (assuming object and typeerror have their original values and that callback.call() evaluates to the original value of function.prototype.call()).
Array.prototype.includes() - JavaScript
note: technically speaking, includes() uses the samevaluezero algorithm to determine whether the given element is found.
Array.prototype.map() - JavaScript
this algorithm is exactly the one specified in ecma-262, 5th edition, assuming object, typeerror, and array have their original values and that callback.call evaluates to the original value of function.prototype.call.
Array.prototype.some() - JavaScript
this algorithm is exactly the one specified in ecma-262, 5th edition, assuming object and typeerror have their original values and that fun.call evaluates to the original value of function.prototype.call().
Date.prototype.setTime() - JavaScript
syntax dateobj.settime(timevalue) parameters timevalue an integer representing the number of milliseconds since 1 january 1970, 00:00:00 utc.
Date.prototype.toString() - JavaScript
however, it must have an internal [[timevalue]] property that can't be constructed using native javascript, so it's effectively limited to use with date instances.
Error.prototype.fileName - JavaScript
if called from a debugger context, the firefox developer tools for example, "debugger eval code" is returned.
Intl - JavaScript
multiple locales may be specified (and a best-supported locale determined by evaluating each of them in order and comparing against the locales supported by the implementation) by passing an array (or array-like object, with a length property and corresponding indexed elements) whose elements are either intl.locale objects or values that convert to unicode bcp 47 locale identifier strings.
JSON - JavaScript
consider this example where json.parse() parses the string as json and eval executes the string as javascript: let code = '"\u2028\u2029"' json.parse(code) // evaluates to "\u2028\u2029" in all engines eval(code) // throws a syntaxerror in old engines other differences include allowing only double-quoted strings and having no provisions for undefined or comments.
Map - JavaScript
key equality key equality is based on the samevaluezero algorithm.
Number.MAX_SAFE_INTEGER - JavaScript
for example, number.max_safe_integer + 1 === number.max_safe_integer + 2 will evaluate to true, which is mathematically incorrect.
Number.isNaN() - JavaScript
description due to both equality operators, == and ===, evaluating to false when checking if nan is nan, the function number.isnan() has become necessary.
Object.is() - JavaScript
polyfill if (!object.is) { object.is = function(x, y) { // samevalue algorithm if (x === y) { // steps 1-5, 7-10 // steps 6.b-6.e: +0 != -0 return x !== 0 || 1 / x === 1 / y; } else { // step 6.a: nan == nan return x !== x && y !== y; } }; } examples using object.is object.is('foo', 'foo'); // true object.is(window, window); // true object.is('foo', 'bar'); // false object.is([], []); // false var fo...
Promise() constructor - JavaScript
const myfirstpromise = new promise((resolve, reject) => { // do something asynchronous which eventually calls either: // // resolve(somevalue) // fulfilled // or // reject("failure reason") // rejected }); making functions return a promise to provide a function with promise functionality, have it return a promise: function myasyncfunction(url) { return new promise((resolve, reject) => { const xhr = new xmlhttprequest() xhr.open("get", url) xhr.onload = () => resolve(xhr.responsetext) xhr.onerror = ...
Promise.all() - JavaScript
og('the stack is now empty'); console.log(p); }); // logs // promise { <state>: "pending" } // the stack is now empty // promise { <state>: "rejected", <reason>: 44 } but, promise.all resolves synchronously if and only if the iterable passed is empty: var p = promise.all([]); // will be immediately resolved var p2 = promise.all([1337, "hi"]); // non-promise values will be ignored, but the evaluation will be done asynchronously console.log(p); console.log(p2) settimeout(function() { console.log('the stack is now empty'); console.log(p2); }); // logs // promise { <state>: "fulfilled", <value>: array[0] } // promise { <state>: "pending" } // the stack is now empty // promise { <state>: "fulfilled", <value>: array[2] } promise.all fail-fast behaviour promise.all is rejected if ...
Proxy - JavaScript
e, i1 is null console.log(i1.getattribute('aria-selected')); // 'true' let i2 = view.selected = document.getelementbyid('item-2'); console.log(i1.getattribute('aria-selected')); // 'false' console.log(i2.getattribute('aria-selected')); // 'true' note: even if selected: !null, then giving oldval.setattribute is not a function value correction and an extra property the products proxy object evaluates the passed value and converts it to an array if needed.
RegExp() constructor - JavaScript
the following three expressions create the same regular expression: /ab+c/i new regexp(/ab+c/, 'i') // literal notation new regexp('ab+c', 'i') // constructor the literal notation results in compilation of the regular expression when the expression is evaluated.
RegExp - JavaScript
the following three expressions create the same regular expression: /ab+c/i new regexp(/ab+c/, 'i') // literal notation new regexp('ab+c', 'i') // constructor the literal notation results in compilation of the regular expression when the expression is evaluated.
Set.prototype.has() - JavaScript
note: technically speaking, has() uses the samevaluezero algorithm to determine whether the given element is found.
String.prototype.indexOf() - JavaScript
for example, the following expression returns -1: 'blue whale'.indexof('blue') // returns -1 checking occurrences note that 0 doesn't evaluate to true and -1 doesn't evaluate to false.
WebAssembly.CompileError - JavaScript
instance methods webassembly.compileerror.prototype.tosource() returns code that could eval to the same error.
WebAssembly.LinkError - JavaScript
instance methods webassembly.linkerror.prototype.tosource() returns code that could eval to the same error.
WebAssembly.RuntimeError - JavaScript
instance methods webassembly.runtimeerror.prototype.tosource() returns code that could eval to the same error.
globalThis - JavaScript
you can also use function('return this')(), but environments that disable eval(), like csp in browsers, prevent use of function in this way.
isNaN() - JavaScript
description the necessity of an isnan function unlike all other possible values in javascript, it is not possible to rely on the equality operators (== and ===) to determine whether a value is nan or not, because both nan == nan and nan === nan evaluate to false.
Lexical grammar - JavaScript
string literals evaluate to ecmascript string values.
Assignment (=) - JavaScript
the assignment operation evaluates to the assigned value.
Conditional (ternary) operator - JavaScript
expriftrue an expression which is evaluated if the condition evaluates to a truthy value (one which equals or can be converted to true).
Logical AND assignment (&&=) - JavaScript
syntax expr1 &&= expr2 description short-circuit evaluation the logical and operator is evaluated left to right, it is tested for possible short-circuit evaluation using the following rule: (some falsy expression) && expr is short-circuit evaluated to the falsy expression; short circuit means that the expr part above is not evaluated, hence any side effects of doing so do not take effect (e.g., if expr is a function call, the calling never takes place).
Optional chaining (?.) - JavaScript
let mymap = new map(); mymap.set("foo", {name: "baz", desc: "inga"}); let namebar = mymap.get("bar")?.name; short-circuiting evaluation when using optional chaining with expressions, if the left operand is null or undefined, the expression will not be evaluated.
delete operator - JavaScript
syntax delete expression where expression should evaluate to a property reference, e.g.: delete object.property delete object['property'] parameters object the name of an object, or an expression evaluating to an object.
instanceof - JavaScript
(!mycar will be evaluated before instanceof, so you always try to know if a boolean is an instance of car).
typeof - JavaScript
the typeof operator returns a string indicating the type of the unevaluated operand.
yield* - JavaScript
done: false} console.log(iterator.next()); // {value: "3", done: false} console.log(iterator.next()); // {value: "4", done: false} console.log(iterator.next()); // {value: 5, done: false} console.log(iterator.next()); // {value: 6, done: false} console.log(iterator.next()); // {value: undefined, done: true} the value of yield* expression itself yield* is an expression, not a statement—so it evaluates to a value.
function declaration - JavaScript
typeof foo is function the results are exactly the same for a condition that evaluates to true var hoisted = "foo" in this; console.log(`'foo' name ${hoisted ?
import - JavaScript
(async () => { if (somethingistrue) { const { default: mydefault, foo, bar } = await import('/modules/my-module.js'); } })(); dynamic imports the standard import syntax is static and will always result in all code in the imported module being evaluated at load time.
try...catch - JavaScript
ocks you can create "conditional catch-blocks" by combining try...catch blocks with if...else if...else structures, like this: try { myroutine(); // may throw three types of exceptions } catch (e) { if (e instanceof typeerror) { // statements to handle typeerror exceptions } else if (e instanceof rangeerror) { // statements to handle rangeerror exceptions } else if (e instanceof evalerror) { // statements to handle evalerror exceptions } else { // statements to handle any unspecified exceptions logmyerrors(e); // pass exception object to error handler } } a common use case for this is to only catch (and silence) a small subset of expected errors, and then re-throw the error in other cases: try { myroutine(); } catch (e) { if (e instanceof rangeerror) { ...
var - JavaScript
at the time "x = y" is evaluated, y exists so no referenceerror is thrown and its value is undefined.
JavaScript reference - JavaScript
value properties infinity nan undefined globalthis function properties eval() isfinite() isnan() parsefloat() parseint() decodeuri() decodeuricomponent() encodeuri() encodeuricomponent() fundamental objects object function boolean symbol error objects error aggregateerror evalerror internalerror rangeerror referenceerror syntaxerror typeerror urierror numbers & dates number bigint math date text processing string regexp indexed collections array int8ar...
Image file type and format guide - Web media technologies
bmp (bitmap file) the bmp (bitmap image) file type is most prevalent on windows computers, and is generally used only for special cases in web apps and content.
Applying SVG effects to HTML content - SVG: Scalable Vector Graphics
for example, you can resize the circle in the clip path established above: function toggleradius() { var circle = document.getelementbyid("circle"); circle.r.baseval.value = 0.40 - circle.r.baseval.value; } example: filtering this demonstrates applying a filter to html content using svg.
begin - SVG: Scalable Vector Graphics
WebSVGAttributebegin
the interpretation of a list of start times is detailed in the smil specification in "evaluation of begin and end time lists".
SVG 2 support in Mozilla - SVG: Scalable Vector Graphics
element.xmlspace removed implementation status unknown svgviewspec removed implementation status unknown svgelement.style removed implementation status unknown svggraphicselement.gettransformtoelement() removed not removed yet svggraphicselement.getctm() on the outermost element implementation status unknown animval attribute alias of baseval implementation status unknown dataset attribute for svgelement implementation status unknown moved pathlength attribute and gettotallength() and getpointatlength() methods from svgpathelement to svggeometryelement implemented (bug 1239100) document structure change notes svgsvgelement.suspendredraw(), svgsvgelement.unsuspendredraw(), and...
Clipping and masking - SVG: Scalable Vector Graphics
for the clipping, every path inside the clippath is inspected and evaluated together with its stroke properties and transformation.
choose - XPath
note: all parameters are evaluated, even the one that's not returned.
document - XPath
if the uri argument is a node-set, and the second argument is present, each node in the node-set will be evaluated as a separate uri, and the returned node-set will be as if the document function has been called multiple times (each time with the same second argument just as given in the function call) and the resulting node-sets had been concatenated into a single node-set.
element-available - XPath
syntax element-available(qname ) arguments qname must evaluate to a valid qname.
false - XPath
WebXPathFunctionsfalse
notes this function is useful part of a comparison: <xsl:if test="boolean((1 &gt; 2) = false())"> the expression evaluates as true </xsl:if> defined xpath 1.0 4.3 gecko support supported.
format-number - XPath
xslt/xpath reference: xslt elements, exslt functions, xpath functions, xpath axes the format-number function evaluates a number and returns a string representing the number in a given format.
string-length - XPath
syntax string-length( [string] ) arguments string(optional) the string to evaluate.
substring-after - XPath
syntax substring-after(haystack ,needle ) arguments haystack the string to be evaluated.
substring-before - XPath
syntax substring-before(haystack ,needle ) arguments haystack the string to be evaluated.
substring - XPath
syntax substring(string ,start [,length] ) arguments string the string to evaluate.
system-property - XPath
the argument must evaluate to a string that is a qname.
<xsl:when> - XSLT: Extensible Stylesheet Language Transformations
WebXSLTElementwhen
syntax <xsl:when test=expression> template </xsl:when> required attributes test specifies a boolean expression to be evaluated.
An Overview - XSLT: Extensible Stylesheet Language Transformations
this path consists of xpath-specific expressions to be evaluated, expressions which may include a number of conditions to be matched, a way of associating nodes, and/or an indication of directionality within the tree.
Advanced Example - XSLT: Extensible Stylesheet Language Transformations
using {} evaluates the content as an xpath expression.