Document: animationcancel event - Web APIs
the animationcancel event is fired when a css animation unexpectedly aborts.
... bubbles yes cancelable no interface animationevent event handler property onanimationcancel the original target for this event is the element that had the animation applied.
...for full details on this event please see the page on htmlelement: animationcancel.
...And 2 more matches

GlobalEventHandlers.oncancel - Web APIs
the oncancel property of the globaleventhandlers mixin is an eventhandler for processing cancel events sent to a <dialog> element.
... the cancel event fires when the user indicates a wish to dismiss a <dialog>.
... syntax target.oncancel = functionref; value functionref is a function name or a function expression.
...And 2 more matches

GlobalEventHandlers.ontouchcancel - Web APIs
the ontouchcancel property of the globaleventhandlers mixin is an eventhandler that processes touchcancel events.
... syntax var cancelhandler = someelement.ontouchcancel; return value cancelhandler the touchcancel event handler for element someelement.
... example this example shows two ways to use ontouchcancel to set an element's touchcancel event handler.
...And 2 more matches

MediaTrackConstraints.echoCancellation - Web APIs
the mediatrackconstraints dictionary's echocancellation property is a constrainboolean describing the requested or mandatory constraints placed upon the value of the echocancellation constrainable property.
... if needed, you can determine whether or not this constraint is supported by checking the value of mediatracksupportedconstraints.echocancellation as returned by a call to mediadevices.getsupportedconstraints().
... syntax var constraintsobject = { echocancellation: constraint }; constraintsobject.echocancellation = constraint; value if this value is a simple true or false, the user agent will attempt to obtain media with echo cancellation enabled or disabled as specified, if possible, but will not fail if this can't be done.
...And 2 more matches

Window: animationcancel event - Web APIs
the animationcancel event is fired when a css animation unexpectedly aborts.
... bubbles yes cancelable no interface animationevent event handler property onanimationcancel the original target for this event is the element that had the animation applied.
...for full details on this event please see the page on htmlelement: animationcancel.
...And 2 more matches

FC_CancelFunction
name fc_cancelfunction - cancel a function running in parallel syntax ck_rv fc_cancelfunction( ck_session_handle hsession ); parameters hsession [in] session handle.
...fc_cancelfunction is a legacy function that simply returns ckr_function_not_parallel.
... return value fc_cancelfunction always returns ckr_function_not_parallel.
... examples see also nsc_cancelfunction ...

Document: pointercancel event - Web APIs
the pointercancel event is fired when the browser determines that there are unlikely to be any more pointer events, or if after the pointerdown event is fired, the pointer is then used to manipulate the viewport by panning, zooming, or scrolling.
... bubbles yes cancelable no interface pointerevent event handler property onpointercancel some examples of situations that will trigger a pointercancel event: a hardware event occurs that cancels the pointer activities.
... after the pointercancel event is fired, the browser will also send pointerout followed by pointerleave.
... examples using addeventlistener(): document.addeventlistener('pointercancel', (event) => { console.log('pointer event cancelled') }); using the onpointercancel event handler property: document.onpointercancel = (event) => { console.log('pointer event cancelled') }; specifications specification status pointer events obsolete ...

HTMLElement: pointercancel event - Web APIs
the pointercancel event is fired when the browser determines that there are unlikely to be any more pointer events, or if after the pointerdown event is fired, the pointer is then used to manipulate the viewport by panning, zooming, or scrolling.
... bubbles yes cancelable no interface pointerevent event handler property onpointercancel some examples of situations that will trigger a pointercancel event: a hardware event occurs that cancels the pointer activities.
... after the pointercancel event is fired, the browser will also send pointerout followed by pointerleave.
... examples using addeventlistener(): const para = document.queryselector('p'); para.addeventlistener('pointercancel', (event) => { console.log('pointer event cancelled'); }); using the onpointercancel event handler property: const para = document.queryselector('p'); para.onpointercancel = (event) => { console.log('pointer event cancelled'); }; specifications specification status pointer events obsolete ...

ReadableStreamBYOBReader.cancel() - Web APIs
the cancel() method of the readablestreambyobreader interface cancels the stream, signaling a loss of interest in the stream by a consumer.
... note: if the reader is active, the cancel() method behaves the same as that for the associated stream (readablestream.cancel()).
... syntax var promise = readablestreambyobreader.cancel(reason); parameters reason a domstring providing a human-readable reason for the cancellation.
... specifications specification status comment streamsthe definition of 'cancel()' in that specification.

window.cancelAnimationFrame() - Web APIs
the window.cancelanimationframe() method cancels an animation frame request previously scheduled through a call to window.requestanimationframe().
... syntax window.cancelanimationframe(requestid); parameters requestid the id value returned by the call to window.requestanimationframe() that requested the callback.
... examples var requestanimationframe = window.requestanimationframe || window.mozrequestanimationframe || window.webkitrequestanimationframe || window.msrequestanimationframe; var cancelanimationframe = window.cancelanimationframe || window.mozcancelanimationframe; var start = window.mozanimationstarttime; // only supported in ff.
... var myreq; function step(timestamp) { var progress = timestamp - start; d.style.left = math.min(progress / 10, 200) + 'px'; if (progress < 2000) { // it's important to update the requestid each time you're calling requestanimationframe myreq = requestanimationframe(step); } } myreq = requestanimationframe(step); // the cancelation uses the last requestid cancelanimationframe(myreq); specifications specification status comment html living standardthe definition of 'cancelanimationframe()' in that specification.

XRSession.cancelAnimationFrame() - Web APIs
the cancelanimationframe() method of the xrsession interface cancels an animation frame which was previously requested by calling requestanimationframe.
... syntax xrsession.cancelanimationframe(handle); parameters handle the unique value returned by the call to requestanimationframe() that previously scheduled the animation callback.
... the pausexr() function shown at the bottom can be called to suspend the webvr session, in essence, by canceling any pending animation frame callback.
...nction framecallback(time, xrframe) { xrsession.requestanimationframe(framecallback); // update and render the frame } async function startxr() { xrsession = xr.requestsession("immersive-vr"); if (xrsession) { stopbutton.onclick = stopxr; requesthandle = xrsession.requestanimationframe(framecallback); } } function pausexr() { if (xrsession && requesthandle) { xrsession.cancelanimationframe(requesthandle); requesthandle = null; } } specifications specification status comment webxr device apithe definition of 'xrsession.cancelanimationframe' in that specification.

nsICancelable
netwerk/base/public/nsicancelable.idlscriptable this interface provides a means to cancel an operation that is in progress.
... 1.0 66 introduced gecko 1.8 inherits from: nsisupports last changed in gecko 1.8 (firefox 1.5 / thunderbird 1.5 / seamonkey 1.0) method overview void cancel(in nsresult areason); methods cancel() call this method to request that this object abort whatever operation it may be performing.
... void cancel( in nsresult areason ); parameters areason a failure code indicating why the operation is being canceled.

AudioParam.cancelScheduledValues() - Web APIs
the cancelscheduledvalues() method of the audioparam interface cancels all scheduled future changes to the audioparam.
... syntax var audioparam = audioparam.cancelscheduledvalues(starttime) parameters starttime a double representing the time (in seconds) after the audiocontext was first created after which all scheduled changes will be cancelled.
... examples var gainnode = audioctx.creategain(); gainnode.gain.setvaluecurveattime(wavearray, audioctx.currenttime, 2); //'gain' is the audioparam gainnode.gain.cancelscheduledvalues(audioctx.currenttime); specifications specification status comment web audio apithe definition of 'cancelscheduledvalues' in that specification.

Event.cancelBubble - Web APIs
the cancelbubble property of the event interface is a historical alias to event.stoppropagation().
... syntax event.cancelbubble = bool; var bool = event.cancelbubble; value a boolean.
... example elem.onclick = function(event) { // do cool things here event.cancelbubble = true; } specifications specification status comment domthe definition of 'cancelbubble' in that specification.

HTMLDialogElement: cancel event - Web APIs
the cancel event fires on a <dialog> when the user instructs the browser that they wish to dismiss the current open dialog.
... bubbles no cancelable yes interface event event handler oncancel examples live example html <dialog class="example-dialog"> <button class="close" type="reset">close</button> </dialog> <button class="open-dialog">open dialog</button> <div class="result"></div> css button, div { margin: .5rem; } js const result = document.queryselector('.result'); const dialog = document.queryselector('.example-dialog'); dialog.addeventlistener('cancel', (event) => { result.textcontent = 'dialog was canceled'; }); const opendialog = document.queryselector('.open-dialog'); opendialog.add...
...ion') { dialog.showmodal(); result.textcontent = ''; } else { result.textcontent = 'the dialog api is not supported by this browser'; } }); const closebutton = document.queryselector('.close'); closebutton.addeventlistener('click', () => { dialog.close(); }); result specifications specification status html living standardthe definition of 'cancel' in that specification.

MediaTrackSupportedConstraints.echoCancellation - Web APIs
the mediatracksupportedconstraints dictionary's echocancellation property is a read-only boolean value which is present (and set to true) in the object returned by mediadevices.getsupportedconstraints() if and only if the user agent supports the echocancellation constraint.
... syntax echocancellationconstraintsupported = supportedconstraintsdictionary.echocancellation; value this property is present in the dictionary (and its value is always true) if the user agent supports the echocancellation constraint.
... example html content <div id="result"> </div> css content #result { font: 14px "arial", sans-serif; } javascript content let result = document.getelementbyid("result"); if (navigator.mediadevices.getsupportedconstraints().echocancellation) { result.innerhtml = "supported!"; } else { result.innerhtml = "not supported!"; } result specifications specification status comment media capture and streamsthe definition of 'echocancellation' in that specification.

SpeechSynthesis.cancel() - Web APIs
the cancel() method of the speechsynthesis interface removes all utterances from the utterance queue.
... syntax speechsynthesisinstance.cancel(); returns void.
...this is quite a long sentence to say.'); var utterance2 = new speechsynthesisutterance('we should say another sentence too, just to be on the safe side.'); synth.speak(utterance1); synth.speak(utterance2); synth.cancel(); // utterance1 stops being spoken immediately, and both are removed from the queue specifications specification status comment web speech apithe definition of 'cancel()' in that specification.

UIEvent.cancelBubble - Web APIs
the uievent.cancelbubble property indicates if event bubbling for this event has been canceled or not.
... syntax event.cancelbubble = bool; var bool = event.cancelbubble; specifications this property is not part of any specification.
... although the similar event.cancelbubble property was included in an old working draft of w3c dom level 2.

window.cancelIdleCallback() - Web APIs
summary the window.cancelidlecallback() method cancels a callback previously scheduled with window.requestidlecallback().
... syntax window.cancelidlecallback(handle); parameters handle the id value returned by window.requestidlecallback() when the callback was established.
... desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetcancelidlecallback experimentalchrome full support 47edge full support 79firefox full support 55 full support 55 full support 53disabled disabled from version 53: this feature is be...

cancelInstall - Archive of obsolete content
method of install object syntax void cancelinstall() void cancelinstall( int errorcode ) parameters none.
...err = getlasterror(); if (!err) performinstall(); else cancelinstall(err); ...

cancel - Archive of obsolete content
« xul reference home cancel() return type: no return value call this method to cancel and close the wizard.
... the code in the onwizardcancel attribute is called before the wizard is cancelled.

PR_CancelJob
causes a previously queued job to be canceled.
... syntax #include <prtpool.h> nspr_api(prstatus) pr_canceljob(prjob *job); parameter the function has the following parameter: job a pointer to a prjob structure returned by a pr_queuejob function representing the job to be cancelled.

Document: touchcancel event - Web APIs
the touchcancel event is fired when one or more touch points have been disrupted in an implementation-specific manner (for example, too many touch points are created).
... bubbles yes cancelable no interface touchevent event handler property ontouchcancel examples code samples for those events are available on the dedicated page: touch events.

Element: touchcancel event - Web APIs
the touchcancel event is fired when one or more touch points have been disrupted in an implementation-specific manner (for example, too many touch points are created).
... bubbles yes cancelable no interface touchevent event handler property ontouchcancel examples code samples for those events are available on the dedicated page: touch events.

::-webkit-search-cancel-button - CSS: Cascading Style Sheets
the ::-webkit-search-cancel-button css pseudo-element represents a button (the "cancel button") at the edge of an <input> of type="search" which clears away the current value of the <input> element.
... syntax selector::-webkit-search-cancel-button specifications not part of any standard.

buttonaccesskeycancel - Archive of obsolete content
« xul reference home buttonaccesskeycancel type: string the access key to use for the "cancel" button.

buttonlabelcancel - Archive of obsolete content
« xul reference home buttonlabelcancel type: string the label to appear on the "cancel" button.

cancelDialog - Archive of obsolete content
« xul reference home canceldialog() return type: no return value cancels the dialog and closes it, similar to pressing the cancel button.

Index - Web APIs
64 animation.cancel() api, animation, method, reference, web animations, cancel, waapi, web animations api the web animations api's cancel() method of the animation interface clears all keyframeeffects caused by this animation and aborts its playback.
... 70 animation.oncancel api, animation, event handler, property, reference, web animations, events, oncancel, web animations api the oncancel property of the web animations api's animation interface is the event handler for the cancel event.
...a new promise is created every time the animation enters the "pending" play state as well as when the animation is canceled, since in both of those scenarios, the animation is ready to be started again.
...And 54 more matches

Download
method overview promise start(); promise launch(); promise showcontainingdirectory(); promise cancel(); promise removepartialdata(); promise whensucceeded(); promise finalize([optional] boolean aremovepartialdata); properties attribute type description canceled read only boolean indicates that the download has been canceled.
... this property can become true, then it can be reset to false when a canceled download is restarted.
... this property becomes true as soon as the cancel() method is called, though the stopped property might remain false until the cancellation request has been processed.
...And 24 more matches

nsIPromptService
button_pos_1 256 this is the button used to cancel the prompt.
... it typically has the label "cancel" or "no".
... button_pos_2 65536 this button can be used to give the user a choice of options, but still allowing the user to cancel the prompt.
...And 20 more matches

WebRequest.jsm
the event listener receives detailed information about the request, and can modify or cancel the request.
...this then enables the event listener to modify or cancel the request.
... see modifying & canceling requests.
...And 16 more matches

Drag Operations - Web APIs
you can use the value none to indicate that no drop is allowed at this location, although it is preferred not to cancel the event in this case.
... if you want to allow a drop, you must prevent the default handling by cancelling both the dragenter and dragover events.
... to do this, call a function which checks a condition and only cancels the event when the condition is met.
...And 13 more matches

nsIDownloadManager
to get the service, use: var downloadmanager = components.classes["@mozilla.org/download-manager;1"] .getservice(components.interfaces.nsidownloadmanager); method overview nsidownload adddownload(in short adownloadtype, in nsiuri asource, in nsiuri atarget, in astring adisplayname, in nsimimeinfo amimeinfo, in prtime astarttime, in nsilocalfile atempfile, in nsicancelable acancelable, in boolean aisprivate); void addlistener(in nsidownloadprogresslistener alistener); void canceldownload(in unsigned long aid); void cleanup(); void endbatchupdate(); obsolete since gecko 1.9.1 void flush(); obsolete since gecko 1.8 nsidownload getdownload(in unsigned long aid); void onclose(); obsolete since gecko 1...
....9.1 void open(in nsidomwindow aparent, in nsidownload adownload); obsolete since gecko 1.9.1 void openprogressdialogfor(in nsidownload adownload, in nsidomwindow aparent, in boolean acanceldownloadonclose); obsolete since gecko 1.9.1 void pausedownload(in unsigned long aid); void removedownload(in unsigned long aid); void removedownloadsbytimeframe(in long long abegintime, in long long aendtime); void removelistener(in nsidownloadprogresslistener alistener); void resumedownload(in unsigned long aid); void retrydownload(in unsigned long aid); void savestate(); obsolete since gecko 1.8 void startbatchupdate(); obsolete since gecko 1.9.1 attributes attribute type description ...
... cancleanup boolean whether or not there are downloads that can be cleaned up (removed) that is downloads that have completed, have failed or have been canceled.
...And 11 more matches

Vue conditional rendering: editing existing todos - Learn web development
copy the following code into that file: <template> <form class="stack-small" @submit.prevent="onsubmit"> <div> <label class="edit-label">edit name for &quot;{{label}}&quot;</label> <input :id="id" type="text" autocomplete="off" v-model.lazy.trim="newlabel" /> </div> <div class="btn-group"> <button type="button" class="btn" @click="oncancel"> cancel <span class="visually-hidden">editing {{label}}</span> </button> <button type="submit" class="btn btn__primary"> save <span class="visually-hidden">edit for {{label}}</span> </button> </div> </form> </template> <script> export default { props: { label: { type: string, required: true }, id: { type: str...
...ing, required: true } }, data() { return { newlabel: this.label }; }, methods: { onsubmit() { if (this.newlabel && this.newlabel !== this.label) { this.$emit("item-edited", this.newlabel); } }, oncancel() { this.$emit("edit-cancelled"); } } }; </script> <style scoped> .edit-label { font-family: arial, sans-serif; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; color: #0b0c0c; display: block; margin-bottom: 5px; } input { display: inline-block; margin-top: 0.4rem; width: 100%; min-height: 4.4rem; padding: 0.4rem 0.8rem; border: 2px solid #565656; } form { display: flex; flex-direction: row; flex-wrap: wrap; } form > * { flex: 0 0 100%; } </style> note: walk throug...
... there is a "save" button and a "cancel" button: when the "save" button is clicked, the component emits the new label via an item-edited event.
...And 10 more matches

Document - Web APIs
globaleventhandlers.onanimationcancel an eventhandler called when an animationcancel event is sent, indicating that a running css animation has been canceled.
... globaleventhandlers.oncancel is an eventhandler representing the code to be called when the cancel event is raised.
... globaleventhandlers.onpointercancel is an eventhandler representing the code to be called when the pointercancel event is raised.
...And 10 more matches

Componentizing our Svelte app - Learn web development
when entering editing mode we'll show an <input> field to allow us to edit the current todo name, with two buttons to confirm or cancel our changes.
...when the todo is in editing mode, the user can save or cancel the changes.
... add the following set of functions below your previous function to handle these actions: function oncancel() { name = todo.name // restores name to its initial value and editing = false // and exit editing mode } function onsave() { update({ name: name }) // updates todo name editing = false // and exit editing mode } function onremove() { dispatch('remove', todo) // emit remove event } function onedit() { editing = true // enter editing mode } function ontoggle() { update({ completed: !todo.completed}) // updates todo status } updati...
...And 8 more matches

IME handling guide
finally, this class guarantees that requesting to commit or cancel current composition to ime is perefored synchronously.
... note that even if there are pending notifications, they are canceled when notify_ime_of_focus is sent since querying content with following notifications immediately after getting focus does not make sense.
... if this notification is tried to sent before sending notify_ime_of_focus, all pending notifications and notify_ime_of_blur itself are canceled.
...And 7 more matches

Window - Web APIs
window.cancelanimationframe() enables you to cancel a callback previously scheduled with window.requestanimationframe.
... window.cancelidlecallback() enables you to cancel a callback previously scheduled with window.requestidlecallback.
... window.clearimmediate() cancels the repeated execution set using setimmediate.
...And 7 more matches

Dialogs and Prompts - Archive of obsolete content
add ok and cancel buttons in an order that is consistent with os default (but the button set and layout is highly customizable, see below).
... simple dialog code the following xul code defines a simple dialog with two buttons, ok and cancel (buttons="accept,cancel" attribute on dialog).
... <?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/global.css" type="text/css"?> <dialog xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" id="..." title="..." buttons="accept,cancel" ondialogaccept="return onaccept();" ondialogcancel="return oncancel();"> <script src="chrome://..."/> <!-- content --> </dialog> you need to implement onaccept and oncancel functions in your script.
...And 6 more matches

jspage - Archive of obsolete content
tedtarget:l,target:g,code:b,key:m,shift:a.shiftkey,control:a.ctrlkey,alt:a.altkey,meta:a.metakey}); }});event.keys=new hash({enter:13,up:38,down:40,left:37,right:39,esc:27,space:32,backspace:8,tab:9,"delete":46});event.implement({stop:function(){return this.stoppropagation().preventdefault(); },stoppropagation:function(){if(this.event.stoppropagation){this.event.stoppropagation();}else{this.event.cancelbubble=true;}return this;},preventdefault:function(){if(this.event.preventdefault){this.event.preventdefault(); }else{this.event.returnvalue=false;}return this;}});function class(b){if(b instanceof function){b={initialize:b};}var a=function(){object.reset(this);if(a._prototyping){return this; }this._current=$empty;var c=(this.initialize)?this.initialize.apply(this,arguments):this;delete this._curr...
...>'+__flash__argumentstoxml(arguments,2)+"</invoke>"); return eval(rs);};var fx=new class({implements:[chain,events,options],options:{fps:50,unit:false,duration:500,link:"ignore"},initialize:function(a){this.subject=this.subject||this; this.setoptions(a);this.options.duration=fx.durations[this.options.duration]||this.options.duration.toint();var b=this.options.wait;if(b===false){this.options.link="cancel"; }},gettransition:function(){return function(a){return -(math.cos(math.pi*a)-1)/2;};},step:function(){var a=$time();if(a<this.time+this.options.duration){var b=this.transition((a-this.time)/this.options.duration); this.set(this.compute(this.from,this.to,b));}else{this.set(this.compute(this.from,this.to,1));this.complete();}},set:function(a){return a;},compute:function(c,b,a){return fx.compute(c,...
...b,a); },check:function(){if(!this.timer){return true;}switch(this.options.link){case"cancel":this.cancel();return true;case"chain":this.chain(this.caller.bind(this,arguments)); return false;}return false;},start:function(b,a){if(!this.check(b,a)){return this;}this.from=b;this.to=a;this.time=0;this.transition=this.gettransition(); this.starttimer();this.onstart();return this;},complete:function(){if(this.stoptimer()){this.oncomplete();}return this;},cancel:function(){if(this.stoptimer()){this.oncancel(); }return this;},onstart:function(){this.fireevent("start",this.subject);},oncomplete:function(){this.fireevent("complete",this.subject);if(!this.callchain()){this.fireevent("chaincomplete",this.subject); }},oncancel:function(){this.fireevent("cancel",this.subject).clearchain();},pause:function(){t...
...And 6 more matches

dialog - Archive of obsolete content
attributes buttonaccesskeyaccept, buttonaccesskeycancel, buttonaccesskeydisclosure, buttonaccesskeyextra1, buttonaccesskeyextra2, buttonaccesskeyhelp, buttonalign, buttondir, buttondisabledaccept, buttonlabelaccept, buttonlabelcancel, buttonlabeldisclosure, buttonlabelextra1, buttonlabelextra2, buttonlabelhelp, buttonorient, buttonpack, buttons, defaultbutton, title properties buttons, defaultbutton methods acceptdialog, canceldialog, center...
...windowonscreen, getbutton, movetoalertposition examples <?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/global.css" type="text/css"?> <dialog id="donothing" title="dialog example" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" buttons="accept,cancel" buttonlabelcancel="cancel" buttonlabelaccept="save"> <dialogheader title="options" description="my preferences"/> <groupbox> <caption label="colour"/> <radiogroup> <radio label="red"/> <radio label="green" selected="true"/> <radio label="blue"/> </radiogroup> <label value="nickname"/> <textbox/> </groupbox> </dialog> attributes activetitlebarcolor type: color string specify background color of the window's titlebar when it is active (foreground...
... buttonaccesskeycancel type: string the access key to use for the "cancel" button.
...And 6 more matches

Advanced Svelte: Reactivity, lifecycle, accessibility - Learn web development
and if you click on cancel or save, the focus disappears again.
... put the following contents inside it: <script> import { createeventdispatcher } from 'svelte' const dispatch = createeventdispatcher() let name = '' const addtodo = () => { dispatch('addtodo', name) name = '' } const oncancel = () => name = '' </script> <form on:submit|preventdefault={addtodo} on:keydown={e => e.key === 'escape' && oncancel()}> <h2 class="label-wrapper"> <label for="todo-0" class="label__lg">what needs to be done?</label> </h2> <input bind:value={name} type="text" id="todo-0" autocomplete="off" class="input input__lg" /> <button type="submit" disabled={!name} class="btn btn__primary btn_...
...we are also taking care of the escape key with on:keydown={e => e.key === 'escape' && oncancel()}.
...And 6 more matches

<tr>: The Table Row element - HTML: Hypertext Markup Language
table { border: 1px solid black; } th, td { border: 1px solid black; } result row and column spanning now, let's introduce another column that shows the date the user's membership ended, along with a super-heading above the "joined" and "canceled" dates called "membership dates".
... result let's actually look at the output first this time: notice how the heading area here is actually two rows, one with "name", "id", "membership dates", and "balance" headings, and the other with "joined" and "canceled", which are sub-headings below "membership dates".
... having a second row of <th> elements that contains only the "joined" and "canceled" headings.
...And 6 more matches

InstallListener
method overview void onnewinstall(in addoninstall install) void ondownloadstarted(in addoninstall install) void ondownloadprogress(in addoninstall install) void ondownloadended(in addoninstall install) void ondownloadcancelled(in addoninstall install) void ondownloadfailed(in addoninstall install) void oninstallstarted(in addoninstall install) void oninstallended(in addoninstall install, in addon addon) void oninstallcancelled(in addoninstall install) void oninstallfailed(in addoninstall install) void onexternalinstall(in addon install, in addon existingaddon, in...
...a listener may return false to cancel the download.
...a listener may return false to cancel the download.
...And 5 more matches

Pointer events - Web APIs
pointercancel onpointercancel a browser fires this event if it concludes the pointer will no longer be able to generate events (for example the related device is deactived).
... pointerout onpointerout fired for several reasons including: pointer is moved out of the hit test boundaries of an element; firing the pointerup event for a device that does not support hover (see pointerup); after firing the pointercancel event (see pointercancel); when a pen stylus leaves the hover range detectable by the digitizer.
... <html> <script> function over_handler(event) { } function enter_handler(event) { } function down_handler(event) { } function move_handler(event) { } function up_handler(event) { } function cancel_handler(event) { } function out_handler(event) { } function leave_handler(event) { } function gotcapture_handler(event) { } function lostcapture_handler(event) { } function init() { var el=document.getelementbyid("target"); // register pointer event handlers el.onpointerover = over_handler; el.onpointerenter = enter_handler; el.onpointerdown = do...
...And 5 more matches

Event reference
animationcancel a css animation has aborted.
... transitioncancel a css transition has been cancelled.
... compositionend the composition of a passage of text has been completed or canceled.
...And 5 more matches

prefwindow - Archive of obsolete content
attributes buttonalign, buttondir, buttonorient, buttonpack, buttons, defaultbutton, lastselected, onbeforeaccept, ondialogaccept, ondialogcancel, ondialogdisclosure, ondialoghelp, onload, onunload, title, type properties buttons, currentpane, defaultbutton, lastselected, preferencepanes, type methods acceptdialog, addpane, canceldialog, centerwindowonscreen, getbutton, opensubdialog, openwindow, showpane examples <?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/" type="text/css"?> <prefwindow xmlns="http://ww...
... cancel: the cancel button which will cancel the operation.
...warning: if the accept and cancel buttons are actually shown is system dependent and is mainly controlled by the value of the boolean preference browser.preferences.instantapply.
...And 4 more matches

Focus management with Vue refs - Learn web development
similarly, if you save or cancel your edit, focus will disappear again as you move back to the non-edit view.
...we'll also want to put focus back on the "edit" button when a user cancels or saves their edit.
... vue's $nexttick() method we want to set focus on the "edit" button when a user saves or cancels their edit.
...And 4 more matches

imgIRequest
inherits from: nsirequest last changed in gecko 8.0 (firefox 8.0 / thunderbird 8.0 / seamonkey 2.5) method overview void cancelandforgetobserver(in nsresult astatus); imgirequest clone(in imgidecoderobserver aobserver); void decrementanimationconsumers(); imgirequest getstaticrequest(); void incrementanimationconsumers(); void lockimage(); void requestdecode(); void unlockimage(); attributes attribute type description corsmode long the cors mode that this image was loaded with.
... status_load_partial 0x2 used internally by imgrequest to flag that a request is being cancelled as a result of a failure of a proxy holder and not an internal failure.
... cors_anonymous 2 cors_use_credentials 3 methods cancelandforgetobserver() cancels this request as in nsirequest.cancel(); further, also nulls out decoderobserver so it gets no further notifications from us.
...And 4 more matches

nsIAuthPrompt
methods prompt() this method puts up a text input dialog with ok and cancel buttons.
... result the result of the dialog box, ok or cancel buttons.
... return value true for ok, false for cancel.
...And 4 more matches

nsIDOMEvent
nseventptr getinternalnsevent(); violates the xpcom interface guidelines boolean getpreventdefault(); deprecated since gecko 16.0 void initevent(in domstring eventtypearg, in boolean canbubblearg, in boolean cancelablearg); boolean isdispatchstopped(); violates the xpcom interface guidelines void preventbubble(); obsolete since gecko 24 void preventcapture(); obsolete since gecko 24 void preventdefault(); void serialize(in ipcmessageptr amsg, in boolean aserializeinterfacetype); violates the xpcom interface guidelines void settarget(in nsidomeventtarge...
... cancelable boolean used to indicate whether or not an event can have its default action prevented.
... void initevent( in domstring eventtypearg, in boolean canbubblearg, in boolean cancelablearg ); parameters eventtypearg specifies the event type.
...And 4 more matches

nsISHistoryListener
docshell/shistory/public/nsishistorylistener.idlscriptable an interface you can implement to receive notifications about activities that occur in session history, and optionally cancel them.
... return value true to allow the go back operation to proceed or false to cancel it.
... return value true to allow the go forward operation to proceed or false to cancel it.
...And 4 more matches

nsIWebBrowserPersist
inherits from: nsicancelable last changed in gecko 36.0 (firefox 36.0 / thunderbird 36.0 / seamonkey 2.33) implemented by: @mozilla.org/embedding/browser/nswebbrowser;1 and @mozilla.org/embedding/browser/nswebbrowserpersist;1.
... to create an instance, use: var webbrowserpersist = components.classes["@mozilla.org/embedding/browser/nswebbrowserpersist;1"] .createinstance(components.interfaces.nsiwebbrowserpersist); method overview void cancelsave(); void savechannel(in nsichannel achannel, in nsisupports afile); void savedocument(in nsidomdocument adocument, in nsisupports afile, in nsisupports adatapath, in string aoutputcontenttype, in unsigned long aencodingflags, in unsigned long awrapcolumn); void saveuri(in nsiuri auri, in nsisupports acachekey, in nsiuri areferrer, in long areferrerpolicy, in nsiinputstream apostdata, in string aextraheaders, in nsisupports afile, in nsiloadcontext aprivacycontext); void saveprivacyawareuri(in nsiuri auri, i...
... persist_flags_cleanup_on_failure 8192 automatically cleanup after a failed or cancelled operation, deleting all created files and directories.
...And 4 more matches

Activity Manager examples
ed, initiator is omitted event.init(folder.prettiestname + " is processed", null, "no junk found", process.starttime, // start time date.now()); // completion time event.contexttype = process.contexttype; // optional event.contextobj = process.contextobj; // optional gactivitymanager.addactivity(event); showing a user-defined activity with cancel capability (javascript) this sample improves the previous one by providing an nsiactivitycancelhandler to allow the user to cancel the process.
... // step 1: create a nsiactivitycancelhandler implementation function canceljunkprocess() { // user stuff here..
... } canceljunkprocess.prototype = { cancel: function(aactivity) { let initiator = aactivity.initiator; if (initiator) { let folder = aactivity.getsubjects({})[0]; ....
...And 4 more matches

HTMLElement - Web APIs
toucheventhandlers.ontouchcancel returns the event handling code for the touchcancel event.
... animation events animationcancel fired when an animation unexpectedly aborts.
... also available via the onanimationcancel property.
...And 4 more matches

Using readable streams - Web APIs
the generic syntax skeleton looks like this: const stream = new readablestream({ start(controller) { }, pull(controller) { }, cancel() { }, type, autoallocatechunksize }, { highwatermark, size() }); the constructor takes two objects as parameters.
... cancel() — a method that, when included, will be called if the app signals that the stream is to be cancelled (e.g.
... if readablestream.cancel() is called).
...And 4 more matches

Intercepting Page Loads - Archive of obsolete content
you can't, however, easily cancel the page load.
... asubject.setrequestheader("referer", "http://example.com", false); } else if (re_url_to_cancel.test(url)) { // re_url_to_cancel is a regular expression.
... asubject.cancel(components.results.ns_binding_aborted); } } } this example shows how you can obtain the url for the request, analyze it using regular expressions, and perform actions on it such as modifying http headers, or even canceling the request.
...And 3 more matches

Learn XPI Installer Scripting by Example - Archive of obsolete content
most installation scripts, including the one discussed here, take the following basic form (in pseudo-code and with links to the sections in which these installation steps are documented): initinstall(); if (verify_space()) { err = add_dirs_and_files; register_files; if (err==success) { performinstall() }; else { cancelinstall() }; } as you can see in the code listing, the verification process at the top is on lines 1 to 18; the file addition process, here part of the main installation block, is on lines 24 to 41; the registration part of the main installation block is on lines 42-58; and the execution at the end of the main block is on lines 59 to 71.
...recall that an install process takes the following general form: initinstall(); if (verify_space()) { err = add_dirs_and_files; register_files; if (err==success) { performinstall() }; else { cancelinstall() }; } in this arrangement, the actual execution of the installation is checked against the errors returned from the addition of files to the installation, which may itself have been conditioned on some verification of version and necessary disk space.
... the actual install code used to execute the installation appears in theinstall.js file as follows: if (err==success) { err = performinstall(); logcomment("performinstall() returned: " + err); } else { cancelinstall(err); logcomment("cancelinstall() due to error: " + err); } } else cancelinstall(insufficient_disk_space); performinstall is the function used to execute the install once it has been initialized and loaded, and it is the last step to installing the software.
...And 3 more matches

Index - Archive of obsolete content
34 buttonaccesskeycancel xul attributes, xul reference no summary!
... 43 buttonlabelcancel xul attributes, xul reference no summary!
... 224 ondialogcancel xul attributes, xul reference no summary!
...And 3 more matches

Creating Dialogs - Archive of obsolete content
it provides the useful ability to construct up to four buttons along the bottom of the dialog forok,cancel, and so on.
... example dialog source view <?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/global.css" type="text/css"?> <dialog id="donothing" title="dialog example" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" buttons="accept,cancel" ondialogaccept="return dook();" ondialogcancel="return docancel();"> <script> function dook(){ alert("you pressed ok!"); return true; } function docancel(){ alert("you pressed cancel!"); return true; } </script> <description value="select a button"/> </dialog> you may place any elements that you wish in a dialog.
...the following values may be used, seperated by commas: accept - an ok button cancel - a cancel button help - a help button disclosure - a disclosure button, which is used for showing more information you can set code to execute when the buttons are pressed using the ondialogaccept, ondialogcancel, ondialoghelp and ondialogdisclosure attributes.
...And 3 more matches

Using Spacers - Archive of obsolete content
you'll notice that the cancel button in the dialogs has always set its width so that it fits the text inside it.
...flex examples example 1: <button label="find" flex="1"/> <button label="cancel" flex="1"/> example 2: <button label="find" flex="10"/> <button label="cancel" flex="1"/> example 3: <button label="find" flex="2"/> <button label="replace"/> <button label="cancel" flex="4"/> example 4: <button label="find" flex="2"/> <button label="replace" flex="2"/> <button label="cancel" flex="3"/> example 5: <html:div> <button label="find" flex="2"/> <button la...
... example 2 here, both buttons will grow, but the find button will grow ten times as much as the cancel button, because it has a flex value that is 10 times the flex value of the find button.
...And 3 more matches

Using IO Timeout And Interrupt On NT - Archive of obsolete content
canceling overlapped io by closing the file descriptor therefore, we need to cancel the outstanding overlapped io request before the thread exits.
... nt's <tt>cancelio()</tt> function would be ideal for this purpose.
... unfortunately, <tt>cancelio()</tt> is not available on nt 3.51.
...And 3 more matches

Cooperative asynchronous JavaScript: Timeouts and intervals - Learn web development
universe'); clearing timeouts finally, if a timeout has been created, you can cancel it before the specified time has elapsed by calling cleartimeout(), passing it the identifier of the settimeout() call as a parameter.
... so to cancel our above timeout, you'd do this: cleartimeout(mygreeting); note: see greeter-app.html for a slightly more involved demo that allows you to set the name of the person to say hello to in a form, and cancel the greeting using a separate button (see the source code also).
...(you can see the source code, also.) clearing a requestanimationframe() call clearing a requestanimationframe() call can be done by calling the corresponding cancelanimationframe() method.
...And 3 more matches

DeferredTask.jsm
method overview bool ispending();obsolete since gecko 28 void start();obsolete since gecko 28 void flush();obsolete since gecko 28 void cancel();obsolete since gecko 28 void arm(); void disarm(); promise finalize(); attributes isarmed boolean indicates whether the task is currently requested to start again later, regardless of whether it is currently running.
... void flush(); cancel obsolete since gecko 28 cancel any pending task.
... void cancel(); arm request the execution of the task after the delay specified on construction.
...And 3 more matches

mozIStoragePendingStatement
the mozistoragependingstatement interface represents a pending asynchronous database statement, and offers the cancel() method which allows you to cancel the pending statement.
... last changed in gecko 1.9.2 (firefox 3.6 / thunderbird 3.1 / fennec 1.0) inherits from: nsisupports method overview void cancel(); methods cancel() cancels the pending statement.
... fails only if you attempt to cancel the operation more than once.
...And 3 more matches

nsITextInputProcessor
finally, when you commit the composition with the last composition string, just do this: tip.commitcomposition(); when you commit composition with specific string, specify commit string with its argument: tip.commitcompositionwith("foo-bar-buzz"); when you cancel composition, just do this: tip.cancelcomposition(); when you dispatch keydown event (and one or more keypress events), just do this: var keyevent = new keyboardevent("", // type attribute value should be empty.
...var dodefault = tip.keydown(keyevent); when you dispatch keyup event, just do this: var keyevent = new keyboardevent("", { key: "a", code: "keya", keycode: keyboardevent.dom_vk_a }); var dodefault = tip.keyup(keyevent); startcomposition(), flushpendingcomposition(), commitcomposition(), commitcompositionwith(), and cancelcomposition() can take a keyboardevent which causes modifying the composition state.
... method overview void appendclausetopendingcomposition(in unsigned long alength, in unsigned long aattribute); boolean begininputtransaction(in nsidomwindow awindow, in nsitextinputprocessorcallback acallback); boolean begininputtransactionfortests(in nsidomwindow awindow, [optional] in nsitextinputprocessorcallback acallback); void cancelcomposition([optional] in nsidomkeyevent adomkeyevent, [optional] in unsigned long akeyflags); boolean commitcomposition([optional] in nsidomkeyevent adomkeyevent, [optional] in unsigned long akeyflags); boolean commitcompositionwith(in domstring acommitstring, [optional] in nsidomkeyevent adomkeyevent, [optional] in unsigned long akeyflags); boolean flushpendingcomposit...
...And 3 more matches

nsITimer
it is not necessary to cancel the timer in that case.
... method overview void cancel(); void init(in nsiobserver aobserver, in unsigned long adelay, in unsigned long atype); void initwithcallback(in nsitimercallback acallback, in unsigned long adelay, in unsigned long atype); void initwithfunccallback(in nstimercallbackfunc acallback, in voidptr aclosure, in unsigned long adelay, in unsigned long atype); native code only!
... methods cancel() cancels the timer.
...And 3 more matches

Element - Web APIs
eventtarget.dispatchevent() dispatches an event to this node in the dom and returns a boolean that indicates whether no handler canceled the event.
... cancel fires on a <dialog> when the user instructs the browser that they wish to dismiss the current open dialog.
... also available via the oncancel property.
...And 3 more matches

HTMLElement: transitionend event - Web APIs
bubbles yes cancelable yes interface transitionevent event handler property ontransitionend the transitionend event is fired in both directions - as it finishes transitioning to the transitioned state, and when it fully reverts to the default or non-transitioned state.
... if the transitioncancel event is fired, the transitionend event will not fire.
...over me</div> <div class="message"></div> .transition { width: 100px; height: 100px; background: rgba(255,0,0,1); transition-property: transform background; transition-duration: 2s; transition-delay: 1s; } .transition:hover { transform: rotate(90deg); background: rgba(255,0,0,0); } to this, we'll add some javascript to indicate that the transitionstart, transitionrun, transitioncancel and transitionend events fire.
...And 3 more matches

Chapter 3: Introduction to XUL—How to build a more intuitive UI - Archive of obsolete content
for example, windows places the ok button on the left and the cancel button on the right, while mac os x has the opposite layout.
... cancel the cancel button.
...if these event handlers are not defined, pressing either the accept button or cancel button will simply close that dialog.
...And 2 more matches

Panels - Archive of obsolete content
this is the normal way in which a user would cancel the operation.
... you may wish to also place a cancel or close button within the panel, especially if the panel is larger with a lot of controls within it.
... <panel id="search-panel" noautohide="true"> <textbox id="search"/> <button label="search" oncommand="dosearch();"/> <button label="cancel" oncommand="this.parentnode.hidepopup();"/> </panel> because the panel can no longer be closed by clicking elsewhere, the panel should always provide a means to close the panel itself.
...And 2 more matches

Adding Event Handlers - Archive of obsolete content
we would want to add a script to handle the find button, the cancel button and to handle each menu command.
... our find files example a command handler can be placed on the find and cancel buttons in the find files dialog.
...however, pressing the cancel button should close the window.
...And 2 more matches

Anatomy of a video game - Game development
note: in practice, it is more common to prevent the next requestanimationframe() with an if-statement, rather than calling cancelanimationframe().
... for the second issue, stopping the main loop, you will need to cancel the call to main() with window.cancelanimationframe().
... you will need to pass cancelanimationframe() the id token given by requestanimationframe() when it was last called.
...And 2 more matches

AddonInstall
this can be canceled at any time with the cancel() method.
... method overview void install() void cancel() void addlistener(in installlistener listener) void removelistener(in installlistener listener) properties attribute type description name string the name of the add-on being installed.
...the process will continue in the background until it fails, completes, one of the registered installlisteners pauses it, or the process is canceled by a call to the cancel() method.
...And 2 more matches

Sqlite.jsm
if statements are in progress at the time this function is called, they will be cancelled.
... along with a result row, onrow is passed a cancel function as its second argument.
... consumers of this api can call the cancel function should they want to immediately abort the execution of the statement.
...And 2 more matches

nsIAuthPrompt2
to create an instance, use: var authprompt2 = components.classes["@mozilla.org/login-manager/prompter;1"] .createinstance(components.interfaces.nsiauthprompt2); method overview nsicancelable asyncpromptauth(in nsichannel achannel, in nsiauthpromptcallback acallback, in nsisupports acontext, in pruint32 level, in nsiauthinformation authinfo); boolean promptauth(in nsichannel achannel, in pruint32 level, in nsiauthinformation authinfo); constants constant value description level_none 0 the password will be sent unencrypted.
... if the user closes the dialog using a cancel button or similar, the callback's nsiauthpromptcallback.onauthcancelled() method must be called.
... calling nsicancelable.cancel() on the returned object should close the dialog and must call nsiauthpromptcallback.onauthcancelled() on the provided callback.
...And 2 more matches

nsIProtocolProxyService
to access the service use: var pps = components.classes["@mozilla.org/network/protocol-proxy-service;1"] .getservice(components.interfaces.nsiprotocolproxyservice); method overview deprecated since gecko 18 nsiproxyinfo resolve(in nsiuri auri, in unsigned long aflags); nsicancelable asyncresolve(in nsiuri auri, in unsigned long aflags,in nsiprotocolproxycallback acallback); nsiproxyinfo newproxyinfo(in acstring atype, in autf8string ahost,in long aport, in unsigned long aflags, in unsigned long afailovertimeout, in nsiproxyinfo afailoverproxy); nsiproxyinfo getfailoverforproxy(in nsiproxyinfo aproxyinfo, in nsiuri auri, in nsresult areason); vo...
... nsicancelable asyncresolve( in nsiuri auri, in unsigned long aflags, in nsiprotocolproxycallback acallback ); parameters auri the uri to test.
... return value an nsicancelableobject that can be used to cancel the asynchronous operation.
...And 2 more matches

nsIRequest
method overview void cancel(in nsresult astatus); boolean ispending(); void resume(); void suspend(); attributes attribute type description loadflags nsloadflags the load flags of this request.
... methods cancel() cancels the current request.
... requests that use nsistreamlistener must not call ondataavailable anymore after cancel has been called.
...And 2 more matches

Working with windows in chrome code
ress; setprogress(window.arguments[0].progress); setstatus(window.arguments[0].status); } } function setprogress(value) { gprogressmeter.value = 100 * value / maxprogress; } function setstatus(text) { gstatus.value = "status: " + text + "..."; } ]]></script> <label id="status" value="(no status)" /> <hbox> <progressmeter id="progressmeter" mode="determined" /> <button label="cancel" oncommand="close();" /> </hbox> </window> example 2: interacting with the opener sometimes an opened window needs to interact with its opener; for example, it might do so in order to give notice that the user has made changes in the window.
... let's add code to the previous example to notify the opener when the user presses cancel on the progress dialog.
... if we're sure the window that opened the progress dialog declares the canceloperation function, we can use window.opener.canceloperation() to notify it, like this: <button label="cancel" oncommand="opener.canceloperation(); close();" /> using a callback function.
...And 2 more matches

Advanced animations - Web APIs
losepath(); ctx.fillstyle = this.color; ctx.fill(); } }; function draw() { ctx.clearrect(0,0, canvas.width, canvas.height); ball.draw(); ball.x += ball.vx; ball.y += ball.vy; raf = window.requestanimationframe(draw); } canvas.addeventlistener('mouseover', function(e) { raf = window.requestanimationframe(draw); }); canvas.addeventlistener('mouseout', function(e) { window.cancelanimationframe(raf); }); ball.draw(); boundaries without any boundary collision testing our ball runs out of the canvas quickly.
...ball.y + ball.vy > canvas.height || ball.y + ball.vy < 0) { ball.vy = -ball.vy; } if (ball.x + ball.vx > canvas.width || ball.x + ball.vx < 0) { ball.vx = -ball.vx; } raf = window.requestanimationframe(draw); } canvas.addeventlistener('mouseover', function(e) { raf = window.requestanimationframe(draw); }); canvas.addeventlistener('mouseout', function(e) { window.cancelanimationframe(raf); }); ball.draw(); acceleration to make the motion more real, you can play with the velocity like this, for example: ball.vy *= .99; ball.vy += .25; this slows down the vertical velocity each frame, so that the ball will just bounce on the floor in the end.
...ball.y + ball.vy > canvas.height || ball.y + ball.vy < 0) { ball.vy = -ball.vy; } if (ball.x + ball.vx > canvas.width || ball.x + ball.vx < 0) { ball.vx = -ball.vx; } raf = window.requestanimationframe(draw); } canvas.addeventlistener('mouseover', function(e) { raf = window.requestanimationframe(draw); }); canvas.addeventlistener('mouseout', function(e) { window.cancelanimationframe(raf); }); ball.draw(); trailing effect until now we have made use of the clearrect method when clearing prior frames.
...And 2 more matches

GlobalEventHandlers - Web APIs
globaleventhandlers.onanimationcancel an eventhandler called when an animationcancel event is sent, indicating that a running css animation has been canceled.
... globaleventhandlers.oncancel is an eventhandler representing the code to be called when the cancel event is raised.
... globaleventhandlers.onpointercancel is an eventhandler representing the code to be called when the pointercancel event is raised.
...And 2 more matches

MSManipulationEvent.initMSManipulationEvent() - Web APIs
syntax msmanipulationevent.initmsmanipulationevent(typearg, canbubblearg, cancelablearg, viewarg, detailarg, laststate, currentstate); parameters typearg [in] type: domstring the type of the event being created.
... cancelablearg [in] type: boolean indicates whether the event’s default action can be prevented.
... when true, the default action can be canceled.
...And 2 more matches

Multi-touch interaction - Web APIs
example this example demonstrates using pointer events' various event types (pointerdown, pointermove, pointerup pointercancel, etc.) for different multi-touch interactions.
...the handler for pointerup is used for the pointercancel, pointerout and pointerleave events, since these four events have the same semantics in this application.
... function set_handlers(name) { // install event handlers for the given element var el=document.getelementbyid(name); el.onpointerdown = pointerdown_handler; el.onpointermove = pointermove_handler; // use same handler for pointer{up,cancel,out,leave} events since // the semantics for these events - in this app - are the same.
...And 2 more matches

ReadableStream.ReadableStream() - Web APIs
cancel(reason) optional this method, also defined by the developer, will be called if the app signals that the stream is to be cancelled (e.g.
... if readablestream.cancel() is called).
...the reason parameter contains a domstring describing why the stream was cancelled.
...And 2 more matches

Adding windows and dialogs - Archive of obsolete content
you may be asking yourself what's the big deal about defining a simple xul window with an ok and maybe a cancel button.
... <dialog id="xulschoolhello-hello-dialog" title="&xulschoolhello.hellodialog.title;" buttons="accept,cancel" ondialogaccept="return xulschoolchrome.hellodialog.accept();" ondialogcancel="return xulschoolchrome.hellodialog.cancel();" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> carefully read the specification of the dialog element.
...the only constant rule is that clicking on ok and cancel will close the dialog unless your associated function returns false.
... you should avoid returning false, though, specially with the cancel button.

Index - Archive of obsolete content
781 buttonaccesskeycancel xul attributes, xul reference no summary!
... 790 buttonlabelcancel xul attributes, xul reference no summary!
... 1187 cancel xul methods, xul reference no summary!
... 1188 canceldialog xul methods, xul reference no summary!

Install script template - Archive of obsolete content
condary install location var secondaryfolder; //special error values used by the cycore developers (www.cycore.com) who helped make this install script var exceptionoccurederror = -4711; var winregisnullerror = -4712; var invalidrootkeyerror = -4713; var registrykeynotwritableerror = -4714; //initinstall block //the installation is initialized here -- if we fail here, cancel the installation // initinstall is quite an overloaded method, but i have invoked it here with three strings // which are globally defined err = initinstall(software_name, plid, version); if (err != 0) { // call initinstall again in case illegal characters in plid err = initinstall(software_name, software_name, version); if (err != 0) cancelinstall(err); } //addfiles to current brows...
...k space if(verifydiskspace(pluginsfolder, plugin_size+component_size)) { // start installing plugin shared library reseterror(); // install the plugin shared library to the current browser's plugin directory errblock1 = addfile (plid, version, plugin_file, pluginsfolder, null); if (errblock1!=0) { logcomment("could not add " + plugin_file + " to " + pluginsfolder + ":" + errblock1); cancelinstall(errblock1); } // start installing xpt file if this is a scriptable plugin // install to the plugins directory -- this works well in mozilla 1.0 clients // in mozilla 1.0 clients, the components directory can be avoided for xpt files errblock1 = addfile (plid, version, component_file, pluginsfolder, null); if (errblock1!=0) { logcomment("could not add " + component_file + " to "...
... + pluginsfolder + ":" + errblock1); cancelinstall(errblock1); } } else { logcomment("cancelling current browser install due to lack of space..."); cancellinstall(); } // secondary install block, which sets up plugins and xpt in another location in addition to the current browser errblock2 = createsecondaryinstall(); // performinstall block, in which error conditions from previous blocks are checked.
... you can also simply call refreshplugins() } else cancelinstall(errblock1); // plid solution -- write keys to the registry /** * function for secondary installation of plugin (firstinstall).

confirm - Archive of obsolete content
button position constants button_pos_0: the first logical button button_pos_1: the second logical button button_pos_2: the third logical button button title constants button_title_ok: an 'ok' button button_title_cancel: a 'cancel' button button_title_yes: a 'yes' button button_title_no: a 'no' button button_title_save: a 'save' button button_title_dont_save: a 'don't save' button button_title_revert: a 'revert' button button_title_is_string: custom title specified by the corresponding abuttonxtitle parameter other constants button_pos_0_default: sp...
...note that this only applies to buttons 0 and 2, not button 1 (the "cancel" button).
... std_ok_cancel_buttons: use this instead of the constants above to have standard 'ok' and 'cancel' buttons.
... foobar 0.1?", "confirm", std_yes_no_buttons, null, null, null, "install fluxcompensator 0.4 as well", check); returns the return value is an integer indicating which button the user selected: value button 0 'cancel' or button 1.

Adding Buttons - Archive of obsolete content
in this section, we will add two buttons, a find button and a cancel button.
...buttons are commonly used for the ok and cancel buttons in a dialog, for example.
...for example, ok or cancel.
...the code to add is shown in red below: <?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/" type="text/css"?> <window id="findfile-window" title="find files" orient="horizontal" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <button id="find-button" label="find"/> <button id="cancel-button" label="cancel"/> </window> you'll notice that the cancel button was added also.

Introduction to XBL - Archive of obsolete content
xul (example.xul): <?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/" type="text/css"?> <?xml-stylesheet href="chrome://example/skin/example.css" type="text/css"?> <window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <box class="okcancelbuttons"/> </window> css (example.css): box.okcancelbuttons { -moz-binding: url('chrome://example/skin/example.xml#okcancel'); } xbl (example.xml): <?xml version="1.0"?> <bindings xmlns="http://www.mozilla.org/xbl" xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <binding id="okcancel"> <content> <xul:button label="ok"/> <xul:button label="c...
...the box has been declared to have a class of okcancelbuttons.
... the style sheet associated with the file says that boxes with the class okcancelbuttons have a specialized binding, defined in the xbl file.
...however, to summarize, it causes two buttons to be added automatically inside the box, one an ok button and the other a cancel button.

XBL Attribute Inheritance - Archive of obsolete content
here is another example: xul: <box class="okcancel" oktitle="ok" canceltitle="cancel" image="happy.png"/> css: box.okcancel { -moz-binding: url('chrome://example/skin/example.xml#okcancel'); } xbl: <binding id="okcancel"> <content> <xul:button xbl:inherits="label=oktitle,image"/> <xul:button xbl:inherits="label=canceltitle"/> </content> </binding> the value of the oktitle attribute is mapped to the label attribute of the firs...
...the canceltitle attribute is mapped to the label attribute of the second button.
...the result is as follows: <box class="okcancel" oktitle="ok" canceltitle="cancel" image="happy.png"> <button label="ok" image="happy.png"/> <button label="cancel"/> </box> note that the attributes are duplicated on the inner (anonymous) content.
... changing the attributes on the box with the okcancel class will automatically change the values on the buttons.

mozbrowserusernameandpasswordrequired
the embedder is supposed to retrieve the necessary credentials, usually using a dialog or a database of username/passwords, and then call authenticate() or cancel() as appropriate.
... general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.
... cancel() a function that is called to cancel the authentication.

Index
m interface reference possible values for input format (note that not all image formats support saving alpha channels): 189 imgiloader interfaces, interfaces:scriptable, needscontent, xpcom api reference, xpcom interface reference implemented by @mozilla.org/image/loader;1 as a service: 190 imgirequest interfaces, interfaces:scriptable, needscontent cancels this request as in nsirequest.cancel(); further, also nulls out decoderobserver so it gets no further notifications from us.
... 211 mozistoragependingstatement interfaces, interfaces:scriptable, storage the mozistoragependingstatement interface represents a pending asynchronous database statement, and offers the cancel() method which allows you to cancel the pending statement.
... 377 nsicachingchannel cache, interfaces, interfaces:scriptable, xpcom, xpcom api reference, xpcom interface reference this interface provides: 378 nsicancelable interfaces, interfaces:scriptable, xpcom, xpcom api reference, xpcom interface reference call this method to request that this object abort whatever operation it may be performing.
... 467 nsidnsrequest interfaces, interfaces:scriptable, xpcom, xpcom interface reference called to cancel a pending asynchronous dns request.

Observer Notifications
you can cancel the shutdown from here by setting asubject.data to true (asubject is the first parameter to your observer, the data value is an nsisupportsprbool).
...the attempt to go offline can be canceled.
... note: if your code chooses to cancel the attempt to go offline, it must notify the user.
... em-action-requested item-cancel-action a previous action has been cancelled.

nsIAuthPromptCallback
method overview void onauthavailable(in nsisupports acontext, in nsiauthinformation aauthinfo); void onauthcancelled(in nsisupports acontext, in boolean usercancel); methods onauthavailable() authentication information is available.
... onauthcancelled() notification that the prompt was cancelled.
... void onauthcancelled( in nsisupports acontext, in boolean usercancel ); parameters acontext the context that was passed to nsiauthprompt2.asyncpromptauth().
... usercancel if false, this prompt was cancelled by calling the the cancel method on the nsicancelable; otherwise, it was cancelled by the user.

nsIDNSService
method overview nsicancelable asyncresolve(in autf8string ahostname, in unsigned long aflags, in nsidnslistener alistener, in nsieventtarget alistenertarget); void init(); obsolete since gecko 1.8 nsidnsrecord resolve(in autf8string ahostname, in unsigned long aflags); void shutdown(); obsolete since gecko 1.8 attributes attribute type description myhostname autf...
...nsicancelable asyncresolve( in autf8string ahostname, in unsigned long aflags, in nsidnslistener alistener, in nsieventtarget alistenertarget ); parameters ahostname the host name or ip-address-literal to resolve.
... return value an object that can be used to cancel the host lookup.
...any pending asynchronous requests will be canceled, and the local cache of dns records will be cleared.

nsITextInputProcessorNotification
"request-to-cancel" this is required to be handled.
... when this is requested, the callback should cancel composition synchronously, i.e., nsitextinputprocessor.cancelcomposition() should be called.
... if the callback doesn't want to cancel the composition synchronously, it's okay to cancel it later (i.e., asynchronously).
... however, gecko will cancel the composition with empty string internally.

nsIMsgCloudFileProvider
inherits from: nsisupports method overview void init(in string aaccountkey); void uploadfile(in nsilocalfile afile, in nsirequestobserver acallback); acstring urlforfile(in nsilocalfile afile); void cancelfileupload(in nsilocalfile afile); void refreshuserinfo(in boolean awithui, in nsirequestobserver acallback); void deletefile(in nsilocalfile afile, in nsirequestobserver acallback); void createnewaccount(in acstring aemailaddress, in acstring apassword, in acstring afirstname, in acstring alastname, in nsirequestobserver acallback); void createexistingaccount(in nsirequ...
... uploadcanceled 0x8055311d returned when uploading has stopped because it was cancelled by the user.
... cancelfileupload() cancels an upload currently in progress for some nsilocalfile.
... void cancelfileupload(in nsilocalfile afile); parameters afile the nsilocalfile that is currently being uploaded to cancel.

CustomEvent - Web APIs
event.cancelbubble a historical alias to event.stoppropagation().
... event.cancelable read only a boolean indicating whether the event is cancelable.
... event.defaultprevented read only indicates whether or not the call to event.preventdefault() canceled the event.
... event.preventdefault() cancels the event (if it is cancelable).

Event.initEvent() - Web APIs
syntax event.initevent(type, bubbles, cancelable); type is a domstring defining the type of event.
... cancelable is a boolean defining whether the event can be canceled.
... once set, the read-only property event.cancelable will give its value.
...var event = document.createevent('event'); // create a click event that bubbles up and // cannot be canceled event.initevent('click', true, false); // listen for the event.

Event.preventDefault() - Web APIs
as noted below, calling preventdefault() for a non-cancelable event, such as one dispatched via eventtarget.dispatchevent(), without specifying cancelable: true has no effect.
...box)) { window.cleartimeout(warningtimeout); } else { // insert warningbox after mytextbox mytextbox.parentnode.insertbefore(warningbox, mytextbox.nextsibling); } warningtimeout = window.settimeout(function() { warningbox.parentnode.removechild(warningbox); warningtimeout = -1; }, 2000); } result notes calling preventdefault() during any stage of event flow cancels the event, meaning that any default action normally taken by the implementation as a result of the event will not occur.
... you can use event.cancelable to check if the event is cancelable.
... calling preventdefault() for a non-cancelable event has no effect.

Event - Web APIs
event.cancelbubble a historical alias to event.stoppropagation().
... event.cancelable read only a boolean indicating whether the event is cancelable.
... event.defaultprevented read only indicates whether or not the call to event.preventdefault() canceled the event.
... event.preventdefault() cancels the event (if it is cancelable).

KeyboardEvent.initKeyEvent() - Web APIs
syntax event.initkeyevent (type, bubbles, cancelable, viewarg, ctrlkeyarg, altkeyarg, shiftkeyarg, metakeyarg, keycodearg, charcodearg) parameters type is a domstring representing the type of event.
... cancelable is a boolean i indicating whether the event can be canceled (see cancelable).
... example var event = document.createevent('keyboardevent'); // create a key event // define the event event.initkeyevent("keypress", // typearg, true, // canbubblearg, true, // cancelablearg, null, // viewarg, specifies uievent.view.
... the initkeyevent is the current gecko equivalent of the dom level 3 events (initially drafted and also deprecated in favor of keyboardevent() keyboard.initkeyboardevent() method with the following arguments : typearg of type domstring canbubblearg of type boolean cancelablearg of type boolean viewarg of type views::abstractview keyidentifierarg of type domstring keylocationarg of type unsigned long modifierslist of type domstring); ...

Key Values - Web APIs
vk_oem_attn (0xf0) gdk_key_3270_attn (0xfd0e) "cancel" [1] the cancel key.
... gdk_key_cancel (0xff69) "contextmenu" [3] shows the context menu.
...typically used as an exit, cancel, or "escape this operation" button.
... gdk_key_zoomout (0x1008ff8c) qt::key_zoomout (0x010000f7) keycode_zoom_out (169) [1] in google chrome 52, the cancel key incorrectly returns the key code "pause".

MSSiteModeEvent - Web APIs
preventdefault cancels the default action of an event.
... cancelable gets a value that indicates whether you can cancel an event's default action.
... cancelbubble gets or sets a value that indicates whether an event should be stopped from propagating up from the current target.
... defaultprevented gets a value that indicates whether the default action should be canceled.

Pinch zoom gestures - Web APIs
the handler for pointerup is used for the pointercancel, pointerout and pointerleave events since these four events have the same semantics in this application.
... function init() { // install event handlers for the pointer target var el=document.getelementbyid("target"); el.onpointerdown = pointerdown_handler; el.onpointermove = pointermove_handler; // use same handler for pointer{up,cancel,out,leave} events since // the semantics for these events - in this app - are the same.
... el.onpointerup = pointerup_handler; el.onpointercancel = pointerup_handler; el.onpointerout = pointerup_handler; el.onpointerleave = pointerup_handler; } pointer down the pointerdown event is fired when a pointer (mouse, pen/stylus or touch point on a touchscreen) makes contact with the contact surface.
... in this application, this handler is also used for pointercancel, pointerleave and pointerout events.

ReadableStream.pipeThrough() - Web APIs
preventcancel: if this is set to true, errors in the destination writablestream will no longer cancel the source readablestream.
... in this case the method will return a promise rejected with the source’s error, or with any error that occurs during canceling the source.
... in addition, if the destination writable stream starts out closed or closing, the source readable stream will no longer be canceled.
... in this case the method will return a promise rejected with an error indicating piping to a closed stream failed, or with any error that occurs during canceling the source.

ReadableStream.pipeTo() - Web APIs
preventcancel: if this is set to true, errors in the destination writablestream will no longer cancel the source readablestream.
... in this case the method will return a promise rejected with the source’s error, or with any error that occurs during canceling the source.
... in addition, if the destination writable stream starts out closed or closing, the source readable stream will no longer be canceled.
... in this case the method will return a promise rejected with an error indicating piping to a closed stream failed, or with any error that occurs during canceling the source.

TouchEvent - Web APIs
touchcancel sent when a touch point has been disrupted in some way.
... there are several possible reasons why this might happen (and the exact reasons will vary from device to device, as well as browser to browser): an event of some kind occurred that canceled the touch; this might happen if a modal alert pops up during the interaction.
... the user has placed more touch points on the screen than can be supported, in which case the earliest touch in the touchlist gets canceled.
... globaleventhandlers.ontouchcancel a global event handler for the touchcancel event.

Using Touch Events - Web APIs
touchcancel - fired when a touch point has been disrupted in an implementation-specific manner (for example, too many touch points are created).
...the state changes are starting contact with a touch surface, moving a touch point while maintaining contact with the surface, releasing a touch point and canceling a touch event.
... // register touch event handlers someelement.addeventlistener('touchstart', process_touchstart, false); someelement.addeventlistener('touchmove', process_touchmove, false); someelement.addeventlistener('touchcancel', process_touchcancel, false); someelement.addeventlistener('touchend', process_touchend, false); process an event in an event handler, implementing the application's gesture semantics.
... add touchmove, touchend and touchcancel event handlers within the touchstart.

UIEvent.initUIEvent() - Web APIs
syntax event.inituievent(type, canbubble, cancelable, view, detail) parameters type is a domstring defining the type of event.
... cancelable is a boolean defining whether the event can be canceled.
... once set, the read-only property event.cancelable will give its value.
... example var e = document.createevent("uievent"); // creates a click event that bubbles, can be cancelled, // and with its view and detail property initialized to window and 1, // respectively e.inituievent("click", true, true, window, 1); specifications specification status comment document object model (dom) level 3 events specificationthe definition of 'uievent.inituievent()' in that specification.

Window: beforeunload event - Web APIs
the document is still visible and the event is still cancelable at this point.
... bubbles no cancelable yes interface event event handler property onbeforeunload this event enables a web page to trigger a confirmation dialog asking the user if they really want to leave the page.
... if the user confirms, the browser navigates to the new page, otherwise it cancels the navigation.
... window.addeventlistener('beforeunload', (event) => { // cancel the event as stated by the standard.

WindowOrWorkerGlobalScope.setTimeout() - Web APIs
return value the returned timeoutid is a positive integer value which identifies the timer created by the call to settimeout(); this value can be passed to cleartimeout() to cancel the timeout.
...you may optionally cancel this timeout by pressing on the second button.
... html <p>live example</p> <button onclick="delayedalert();">show an alert box after two seconds</button> <p></p> <button onclick="clearalert();">cancel alert before it happens</button> javascript var timeoutid; function delayedalert() { timeoutid = window.settimeout(window.alert, 2*1000, 'that was really slow!'); } function clearalert() { window.cleartimeout(timeoutid); } result see also cleartimeout() example.
...this[sproperty] : this); }).bind(myarray); myboundmethod(); // prints "zero,one,two" because 'this' is bound to myarray in the function myboundmethod(1); // prints "one" settimeout(myboundmethod, 1.0*1000); // still prints "zero,one,two" after 1 second because of the binding settimeout(myboundmethod, 1.5*1000, "1"); // prints "one" after 1.5 seconds notes timeouts are cancelled using cleartimeout().

Monitoring downloads - Archive of obsolete content
ameter(2, adownload.starttime); statement.execute(); statement.reset(); dbconn.close(); break; // record the completion (whether failed or successful) of the download case components.interfaces.nsidownloadmanager.download_finished: case components.interfaces.nsidownloadmanager.download_failed: case components.interfaces.nsidownloadmanager.download_canceled: this.logtransfercompleted(adownload); break; } }, we're interested in four states.
... if the download's state indicates that the download is finished, canceled, or failed, we call our logtransfercompleted routine to update the log to indicate that state change.
...cument.createelement('listcell'); var statusstr; switch(status) { case 0: statusstr = "downloading"; break; case 1: statusstr = "complete"; style = "color:green"; break; case 2: statusstr = "failed"; style = "color:red"; break; case 3: statusstr = "canceled"; style = "color:purple"; break; case 4: statusstr = "paused"; style = "color:blue"; break; case 5: statusstr = "queued"; style = "color:teal"; break; case 6: statusstr = "blocked"; style = "color:white background-color:red"; break; case 7:...

Supporting private browsing mode - Archive of obsolete content
} }; canceling shutting off private browsing mode extensions can prevent private browsing mode from being shut off.
... to do this, simply watch for the private browsing private-browsing-cancel-vote notification with the subject "exit", and set its data field to true to cancel the operation, like this: var os = components.classes["@mozilla.org/observer-service;1"] .getservice(components.interfaces.nsiobserverservice); os.addobserver(function (asubject, atopic, adata) { asubject.queryinterface(components.interfaces.nsisupportsprbool); // if another extension has not already canceled entering the private mode if (!asubject.data) { if (adata == "exit") { // if we are leaving the private mode ...
... /* you should display some user interface here */ asubject.data = true; // cancel the operation } } }, "private-browsing-cancel-vote", false); note: a well-mannered extension should display some sort of user interface to indicate that private browsing mode will be kept on, and possibly offer the option to cancel whatever operation is preventing the extension from allowing private browsing to be shut off.

initInstall - Archive of obsolete content
after calling initinstall, your script must call performinstall or cancelinstall before it finishes.
... if your script does not call performinstall or cancelinstall, netscape 6 will not be able to clean up properly after your script finishes.
...err = getlasterror(); if (!err) performinstall(); else cancelinstall(err); ...

Installer Script - Archive of obsolete content
cancelinstall(err); 67.
... logcomment("cancelinstall() due to error: " + err); 68.
... cancelinstall(insufficient_disk_space); ...

buttons - Archive of obsolete content
cancel: the cancel button which will cancel the operation.
...warning: if the accept and cancel buttons are actually shown is system dependent and is mainly controlled by the value of the boolean preference browser.preferences.instantapply.
...the cancel button might be shown as an additional possibility to close the dialog in this situation (windows and linux) or might be hidden, too (mac os).

Accesskey display rules - Archive of obsolete content
e.g., when an accesskey of "ok" is 'o' and an accesskey of "キャンセル" (means "cancel") is 'c', the labels will be "ok(o)" and "キャンセル(c)" on japanese localized build.
...because japanese localizers "&cancel" need to localize to "キャンセル(&c)".
...for this issue, we recommend the following format if you use .properties: <command-name>.label=cancel <command-name>.accesskey=c note that apis of nsipromptservice are using the bad way.

Creating a Wizard - Archive of obsolete content
there are also related onwizardback, onwizardnext and onwizardcancel attributes, which are called when the back, next and cancel buttons are pressed respectively.
...these methods will be called when the page is hidden or shown, regardless of which button was pressed (except when cancel is pressed -- you need to use onwizardcancel to check for this.) these three methods should provide enough flexibility to handle navigation as you need to.
...as soon as one returns false, the navigation will be cancelled.

The Box Model - Archive of obsolete content
the example below shows a simple login prompt: example 2 : source view <vbox> <hbox> <label control="login" value="login:"/> <textbox id="login"/> </hbox> <hbox> <label control="pass" value="password:"/> <textbox id="pass"/> </hbox> <button id="ok" label="ok"/> <button id="cancel" label="cancel"/> </vbox> here four elements have been oriented vertically, two inner hbox tags and two button elements.
...example 3 : source view <vbox> <hbox> <vbox> <label control="login" value="login:"/> <label control="pass" value="password:"/> </vbox> <vbox> <textbox id="login"/> <textbox id="pass"/> </vbox> </hbox> <button id="ok" label="ok"/> <button id="cancel" label="cancel"/> </vbox> notice how the text boxes are now aligned with each other.
... </description> <hbox> <label value="search for:" control="find-text"/> <textbox id="find-text"/> </hbox> <hbox> <spacer flex="1"/> <button id="find-button" label="find"/> <button id="cancel-button" label="cancel"/> </hbox> </vbox> the vertical box causes the main text, the box with the textbox and the box with the buttons to orient vertically.

wizard - Archive of obsolete content
attributes firstpage, lastpage, pagestep, title, windowtype properties canadvance, canrewind, currentpage, onfirstpage, onlastpage, pagecount, pageindex, pagestep, title, wizardpages methods advance, cancel, extra1, extra2, getbutton, getpagebyid, goto, rewind examples <?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/" type="text/css"?> <wizard id="thewizard" title="secret code wizard" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <script> function checkcode(){ document.getelementbyid('thewizard').canadvance = (document.getelementbyid('secretc...
... use the cancancel property to indicate to the user (by disabling the cancel button) that they cannot can pagestep type: integer the index of the current page.
... cancel() return type: no return value call this method to cancel and close the wizard.

Dialogs in XULRunner - Archive of obsolete content
here is an example xul dialog: <?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/" type="text/css"?> <dialog id="mydialog" title="my dialog" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" onload="window.sizetocontent();" buttons="accept,cancel" buttonlabelaccept="set favorite" buttonaccesskeyaccept="s" ondialogaccept="return dosave();" buttonlabelcancel="cancel" buttonaccesskeycancel="n" ondialogcancel="return docancel();"> <script> function dosave(){ //dosomething() return true; } function docancel(){ return true; } </script> <dialogheader title="...
...in an effort to make things easier for developers and more consistent for users, xul has a mechanism to automatically create and position the core dialog buttons ("ok," "cancel," and "help" for example).
... here is a short list of the button attributes on dialog; see also creating dialogs at mozillazine knowledge base: buttons a comma separated list of buttons to show on dialog (accept, cancel, help, extra1, and extra2).

Video and Audio APIs - Learn web development
let's step through mediabackward() (the functionality for mediaforward() is exactly the same, but in reverse): we clear any classes and intervals that are set on the fast forward functionality — we do this because if we press the rwd button after pressing the fwd button, we want to cancel any fast forward functionality and replace it with the rewind functionality.
... if active has been set on the rwd button, we remove it using classlist.remove(), clear the interval that has been set when the button was first pressed (see below for more explanation), and use htmlmediaelement.play() to cancel the rewind and start the video playing normally.
...how can we fix it so that they cancel the rwd/fwd button functionality and play/stop the video as you'd expect?

React interactivity: Editing, filtering, conditional rendering - Learn web development
sestate() hook but above the return statement: const editingtemplate = ( <form classname="stack-small"> <div classname="form-group"> <label classname="todo-label" htmlfor={props.id}> new name for {props.name} </label> <input id={props.id} classname="todo-text" type="text" /> </div> <div classname="btn-group"> <button type="button" classname="btn todo-cancel"> cancel <span classname="visually-hidden">renaming {props.name}</span> </button> <button type="submit" classname="btn btn__primary todo-edit"> save <span classname="visually-hidden">new name for {props.name}</span> </button> </div> </form> ); const viewtemplate = ( <div classname="stack-small"> <div classname="c-cb"> <input ...
... update the "edit" button in the viewtemplate like so: <button type="button" classname="btn" onclick={() => setediting(true)}> edit <span classname="visually-hidden">{props.name}</span> </button> now we'll add the same onclick handler to the "cancel" button in the editingtemplate, but this time we'll set isediting to false so that it switches us back to the view template.
... update the "cancel" button in the edittemplate like so: <button type="button" classname="btn todo-cancel" onclick={() => setediting(false)} > cancel <span classname="visually-hidden">renaming {props.name}</span> </button> with this code in place, you should be able to press the "edit" and "cancel" buttons in your todo items to toggle between templates.

Accessible Toolkit Checklist
general dialogs/windows/general escape key cancels dialogs and refocuses the previously focused on the parent window.
... alt+f4 closes windows, similar to escape but even works on dialogs without cancel button alt+space opens window menu with restore, move, size, minimize, maximize, close the move and size options must be usable with the arrow keys on the keyboard in windows, initial focus goes to first focusable widget that is not a clickable tabbed property sheet label making tab order definable.
... lists and combo boxes when a list is tabbed to, select the first item if nothing else is already selected f4, alt+down or alt+up toggle a combo box open and closed escape closes combo box if it was open (be careful not to have it cancel entire dialog) up/down arrow key navigation.

Addon
overview of required methods void iscompatiblewith(in string appversion, in string platformversion) void findupdates(in updatelistener listener, in integer reason, in string appversion, in string platformversion) overview of optional methods void uninstall() void canceluninstall() boolean hasresource(in string path) nsiuri getresourceuri(in string path) void getdatadirectory(in datadirectorycallback callback) required properties attribute type description appdisabled read only boolean true if this add-on cannot be used in the application based on version compatibility, dependencies, and blocklist...
... void uninstall( ) canceluninstall() cancels uninstalling an add-on if it is pending uninstall.
... void canceluninstall( ) hasresource() checks whether a file resource is available for this add-on.

AddonListener
t) void onenabled(in addon addon) void ondisabling(in addon addon, in boolean needsrestart) void ondisabled(in addon addon) void oninstalling(in addon addon, in boolean needsrestart) void oninstalled(in addon addon) void onuninstalling(in addon addon, in boolean needsrestart) void onuninstalled(in addon addon) void onoperationcancelled(in addon addon) void onpropertychanged(in addon addon, in string properties[]) methods onenabling() called when an add-on is about to be enabled.
... void onuninstalled( in addon addon, ) parameters addon the addon that has been uninstalled onoperationcancelled() called when a pending operation for an add-on is cancelled.
... void onoperationcancelled( in addon addon, ) parameters addon the addon that has had a pending operation cancelled onpropertychanged() called when one or more properties of addon has changed.

Add-on Repository
to import the add-on repository code module, use: components.utils.import("resource://gre/modules/addonrepository.jsm"); method overview string getrecommendedurl() string getsearchurl(in string searchterms) void cancelsearch() void retrieverecommendedaddons(in integer maxresults, in searchcallback callback) void searchaddons(in string searchterms, in integer maxresults, in searchcallback callback) properties property type description homepageurl string the url of the repository site's home page.
... cancelsearch() cancels the search in progress.
... void cancelsearch(); parameters none.

NSS functions
ickey mxr 3.2 and later seckey_publickeystrength mxr 3.2 and later seckey_updatecertpqg mxr 3.2 and later secmod_addnewmodule mxr 3.3 and later secmod_addnewmoduleex mxr 3.4 and later secmod_deletemoduleex mxr 3.12 and later secmod_cancelwait mxr 3.9.3 and later secmod_candeleteinternalmodule mxr 3.5 and later secmod_createmodule mxr 3.4 and later secmod_deletemodule mxr 3.4 and later secmod_findmodule mxr 3.4 and later secmod_findslot mxr 3.4 and later secmod_freem...
....2 and later nss_cmscontentinfo_setcontent_digesteddata mxr 3.2 and later nss_cmscontentinfo_setcontent_encrypteddata mxr 3.2 and later nss_cmscontentinfo_setcontent_envelopeddata mxr 3.2 and later nss_cmscontentinfo_setcontent_signeddata mxr 3.2 and later nss_cmsdecoder_cancel mxr 3.2 and later nss_cmsdecoder_finish mxr 3.2 and later nss_cmsdecoder_start mxr 3.2 and later nss_cmsdecoder_update mxr 3.2 and later nss_cmsdigestcontext_cancel mxr 3.2 and later nss_cmsdigestcontext_finishmultiple mxr 3.2 and later ...
...ter nss_cmsdigestcontext_update mxr 3.2 and later nss_cmsdigesteddata_create mxr 3.2 and later nss_cmsdigesteddata_destroy mxr 3.2 and later nss_cmsdigesteddata_getcontentinfo mxr 3.2 and later nss_cmsderencode mxr 3.2 and later nss_cmsencoder_cancel mxr 3.2 and later nss_cmsencoder_finish mxr 3.2 and later nss_cmsencoder_start mxr 3.2 and later nss_cmsencoder_update mxr 3.2 and later nss_cmsencrypteddata_create mxr 3.2 and later nss_cmsencrypteddata_destroy mxr 3.2 and later n...

imgILoader
this means that callers of loadimage should make sure to cancel() the resulting request before the observer goes away.
...this means that callers of loadimagewithchannel should make sure to cancel() the resulting request before the observer goes away.
...achannel will be canceled for you in this case.

nsIChannelEventSink
by calling oldchannel->cancel() there is a certain freedom in implementing this method: if the return-value indicates success, a callback on callback is required.
... exceptions thrown this method can throw any exception; if an exception occurs, the load will be canceled, and no network requests will occur for the new channel.
... the redirect will be canceled.

nsIClipboardDragDropHooks
if there are multiple hooks set for a window, any of them has an opportunity to cancel the action so no further processing will occur.
...otherwise, false to show the drag is canceled (does not go to operating system).
...otherwise, false to indicate that the copy/drag is canceled, does not go to operating system.

nsIDOMMouseScrollEvent
method overview void initmousescrollevent(in domstring typearg, in boolean canbubblearg, in boolean cancelablearg, in nsidomabstractview viewarg, in long detailarg, in long screenxarg, in long screenyarg, in long clientxarg, in long clientyarg, in boolean ctrlkeyarg, in boolean altkeyarg, in boolean shiftkeyarg, in boolean metakeyarg, in unsigned short buttonarg, in nsidomeventtarget relatedtargetarg, in long axis); attributes attribute type description ...
...void initmousescrollevent( in domstring typearg, in boolean canbubblearg, in boolean cancelablearg, in nsidomabstractview viewarg, in long detailarg, in long screenxarg, in long screenyarg, in long clientxarg, in long clientyarg, in boolean ctrlkeyarg, in boolean altkeyarg, in boolean shiftkeyarg, in boolean metakeyarg, in unsigned short buttonarg, in nsidomeventtarget relatedtargetarg, in long axis ); parameters typearg the type of event.
... cancelablearg specifies whether or not the created event can be canceled.

nsIDOMOrientationEvent
last changed in gecko 1.9.2 (firefox 3.6 / thunderbird 3.1 / fennec 1.0) inherits from: nsidomevent method overview void initorientationevent(in domstring eventtypearg, in boolean canbubblearg, in boolean cancelablearg, in double x, in double y, in double z); attributes attribute type description x double the amount of tilt along the x axis.
...void initprogressevent( in domstring eventtypearg, in boolean canbubblearg, in boolean cancelablearg, in double x, in double y, in double z ); parameters eventtypearg the type of event.
...cancelablearg specifies whether or not the created event can be canceled.

nsIDOMProgressEvent
method overview void initprogressevent(in domstring typearg, in boolean canbubblearg, in boolean cancelablearg, in boolean lengthcomputablearg, in unsigned long long loadedarg, in unsigned long long totalarg); deprecated since gecko 22.0 attributes attribute type description lengthcomputable boolean specifies whether or not the total size of the transfer is known.
... void initprogressevent( in domstring typearg, in boolean canbubblearg, in boolean cancelablearg, in boolean lengthcomputablearg, in unsigned long long loadedarg, in unsigned long long totalarg ); parameters typearg the type of event.
... cancelablearg specifies whether or not the created event can be canceled.

nsIDOMSimpleGestureEvent
method overview void initsimplegestureevent(in domstring typearg, in boolean canbubblearg, in boolean cancelablearg, in nsidomabstractview viewarg, in long detailarg, in long screenxarg, in long screenyarg, in long clientxarg, in long clientyarg, in boolean ctrlkeyarg, in boolean altkeyarg, in boolean shiftkeyarg, in boolean metakeyarg, in unsigned short buttonarg, in nsidomeventtarget relatedtargetarg, in unsigned long directionarg, in double deltaarg); attributes attribute type ...
... void initsimplegestureevent( in domstring typearg, in boolean canbubblearg, in boolean cancelablearg, in nsidomabstractview viewarg, in long detailarg, in long screenxarg, in long screenyarg, in long clientxarg, in long clientyarg, in boolean ctrlkeyarg, in boolean altkeyarg, in boolean shiftkeyarg, in boolean metakeyarg, in unsigned short buttonarg, in nsidomeventtarget relatedtargetarg, in unsigned long directionarg, in double deltaarg ); parameters type...
...arg canbubblearg cancelablearg viewarg detailarg screenxarg screenyarg clientxarg clientyarg ctrlkeyarg altkeyarg shiftkeyarg metakeyarg buttonarg relatedtargetarg directionarg the value to assign to the direction attribute.

nsIDOMStorageEventObsolete
method overview void initstorageevent(in domstring typearg, in boolean canbubblearg, in boolean cancelablearg, in domstring keyarg, in domstring oldvaluearg, in domstring newvaluearg, in domstring urlarg, in nsidomstorage storageareaarg); attributes attribute type description domain domstring the domain of the storage area which changed, or "#session" if the event represents a change to session storage.
... void initstorageevent( in domstring typearg, in boolean canbubblearg, in boolean cancelablearg, in domstring domainarg ); parameters typearg the type argument.
... cancelablearg true if the event can be canceled, otherwise false.

nsIProtocolProxyCallback
1.0 66 introduced gecko 1.8 inherits from: nsisupports last changed in gecko 1.8 (firefox 1.5 / thunderbird 1.5 / seamonkey 1.0) method overview void onproxyavailable(in nsicancelable arequest, in nsiuri auri, in nsiproxyinfo aproxyinfo, in nsresult astatus); methods onproxyavailable() this method is called when proxy info is available or when an error in the proxy resolution occurs.
... void onproxyavailable( in nsicancelable arequest, in nsiuri auri, in nsiproxyinfo aproxyinfo, in nsresult astatus ); parameters arequest the value returned from asyncresolve.
... see also nsicancelable nsiuri nsiproxyinfo nsiprotocolproxyservice ...

nsIWorkerMessageEvent
1.0 66 introduced gecko 1.9.1 inherits from: nsidomevent last changed in gecko 1.9.1 (firefox 3.5 / thunderbird 3.0 / seamonkey 2.0) method overview void initmessageevent(in domstring atypearg, in boolean acanbubblearg, in boolean acancelablearg, in domstring adataarg, in domstring aoriginarg, in nsisupports asourcearg); attributes attribute type description data domstring the event's data.
... void initmessageevent( in domstring atypearg, in boolean acanbubblearg, in boolean acancelablearg, in domstring adataarg, in domstring aoriginarg, in nsisupports asourcearg ); parameters atypearg the event type.
... acancelablearg whether or not the event can be canceled.

XUL Overlays
for example, the buttons that appear at the bottom of common dialogs, the ok and cancel buttons, may be used in dozens of places in the ui.
...the mechanism is the same, however.) any dialog that wants to overlay these buttons just declares the overlay at the top: <?xul-overlay href="chrome://global/content/dialogoverlay.xul"?> and includes an empty box with an id of okcancelbuttons in the ui.
... the following snippet shows a dialog with custom ui elements at the top and a reference to the overlay's ok and cancel buttons at the bottom: <box align="horizontal" id="bx1" flex="100%" style="margin-bottom: 1em; width: 100%;"> <html:input type="checkbox" id="dialog.newwindow"/> <html:label for="dialog.newwindow">&openwin.label;</html:label> <spring flex="100%"/> </box> <box id="okcancelbuttons"/> for more detail, see the ok and cancel button definitions being referenced here in the global component file platformdialogoverlay.xul.

Background Tasks API - Web APIs
the implementation of our shim for cancelidlecallback() is much simpler: window.cancelidlecallback = window.cancelidlecallback || function(id) { cleartimeout(id); } if cancelidlecallback() isn't defined, this creates one which simply passes the specified callback id through to cleartimeout().
... the window interface is also augmented by this api to offer the new requestidlecallback() and cancelidlecallback() methods.
... window.requestidlecallback = window.requestidlecallback || function(handler) { let starttime = date.now(); return settimeout(function() { handler({ didtimeout: false, timeremaining: function() { return math.max(0, 50.0 - (date.now() - starttime)); } }); }, 1); }; window.cancelidlecallback = window.cancelidlecallback || function(id) { cleartimeout(id); }; managing the task queue next, let's look at the way we manage the tasks that need to be performed.

CloseEvent.initCloseEvent() - Web APIs
syntax event.initmouseevent(type, canbubble, cancelable, wasclean, reasoncode, reason); parameters type the string to set the event's type to.
... cancelable whether or not the event's default action can be prevented.
... sets the value of event.cancelable.

Element: cut event - Web APIs
bubbles yes cancelable yes interface clipboardevent event handler property oncut the event's default action is to copy the current selection (if any) to the system clipboard and remove it from the document.
... a handler for this event can modify the clipboard contents by calling setdata(format, data) on the event's clipboardevent.clipboarddata property, and cancelling the default action using event.preventdefault().
... note though that cancelling the default action will also prevent the document from being updated.

HTMLDialogElement.close() - Web APIs
from there you can click the cancel button to close the dialog (via the htmldialogelement.close() method), or submit the form via the submit button.
... --> <dialog id="favdialog"> <form method="dialog"> <section> <p><label for="favanimal">favorite animal:</label> <select id="favanimal" name="favanimal"> <option></option> <option>brine shrimp</option> <option>red panda</option> <option>spider monkey</option> </select></p> </section> <menu> <button id="cancel" type="reset">cancel</button> <button type="submit">confirm</button> </menu> </form> </dialog> <menu> <button id="updatedetails">update details</button> </menu> <script> (function() { var updatebutton = document.getelementbyid('updatedetails'); var cancelbutton = document.getelementbyid('cancel'); var dialog = document.getelementbyid('favdialo...
...; dialog.returnvalue = 'favanimal'; function opencheck(dialog) { if(dialog.open) { console.log('dialog open'); } else { console.log('dialog closed'); } } // update button opens a modal dialog updatebutton.addeventlistener('click', function() { dialog.showmodal(); opencheck(dialog); }); // form cancel button closes the dialog box cancelbutton.addeventlistener('click', function() { dialog.close('animalnotchosen'); opencheck(dialog); }); })(); </script> note: you can find this example on github as htmldialogelement-basic (see it live also).

HTMLDialogElement.open - Web APIs
from there you can click the cancel button to close the dialog (via the htmldialogelement.close() method), or submit the form via the submit button.
... --> <dialog id="favdialog"> <form method="dialog"> <section> <p><label for="favanimal">favorite animal:</label> <select id="favanimal" name="favanimal"> <option></option> <option>brine shrimp</option> <option>red panda</option> <option>spider monkey</option> </select></p> </section> <menu> <button id="cancel" type="reset">cancel</button> <button type="submit">confirm</button> </menu> </form> </dialog> <menu> <button id="updatedetails">update details</button> </menu> <script> (function() { var updatebutton = document.getelementbyid('updatedetails'); var cancelbutton = document.getelementbyid('cancel'); var dialog = document.getelementbyid('favdialo...
...; dialog.returnvalue = 'favanimal'; function opencheck(dialog) { if(dialog.open) { console.log('dialog open'); } else { console.log('dialog closed'); } } // update button opens a modal dialog updatebutton.addeventlistener('click', function() { dialog.showmodal(); opencheck(dialog); }); // form cancel button closes the dialog box cancelbutton.addeventlistener('click', function() { dialog.close('animalnotchosen'); opencheck(dialog); }); })(); </script> note: you can find this example on github as htmldialogelement-basic (see it live also).

HTMLDialogElement.show() - Web APIs
from there you can click the cancel button to close the dialog (via the htmldialogelement.close() method), or submit the form via the submit button.
... --> <dialog id="favdialog"> <form method="dialog"> <section> <p><label for="favanimal">favorite animal:</label> <select id="favanimal" name="favanimal"> <option></option> <option>brine shrimp</option> <option>red panda</option> <option>spider monkey</option> </select></p> </section> <menu> <button id="cancel" type="reset">cancel</button> <button type="submit">confirm</button> </menu> </form> </dialog> <menu> <button id="updatedetails">update details</button> </menu> <script> (function() { var updatebutton = document.getelementbyid('updatedetails'); var cancelbutton = document.getelementbyid('cancel'); var dialog = document.getelementbyid('favdialo...
...; dialog.returnvalue = 'favanimal'; function opencheck(dialog) { if(dialog.open) { console.log('dialog open'); } else { console.log('dialog closed'); } } // update button opens a modal dialog updatebutton.addeventlistener('click', function() { dialog.showmodal(); opencheck(dialog); }); // form cancel button closes the dialog box cancelbutton.addeventlistener('click', function() { dialog.close('animalnotchosen'); opencheck(dialog); }); })(); </script> specifications specification status comment html living standardthe definition of 'show()' in that specification.

HTMLDialogElement.showModal() - Web APIs
from there you can click the cancel button to close the dialog (via the htmldialogelement.close() method), or submit the form via the submit button.
... --> <dialog id="favdialog"> <form method="dialog"> <section> <p><label for="favanimal">favorite animal:</label> <select id="favanimal" name="favanimal"> <option></option> <option>brine shrimp</option> <option>red panda</option> <option>spider monkey</option> </select></p> </section> <menu> <button id="cancel" type="reset">cancel</button> <button type="submit">confirm</button> </menu> </form> </dialog> <menu> <button id="updatedetails">update details</button> </menu> <script> (function() { var updatebutton = document.getelementbyid('updatedetails'); var cancelbutton = document.getelementbyid('cancel'); var dialog = document.getelementbyid('favdialo...
...; dialog.returnvalue = 'favanimal'; function opencheck(dialog) { if(dialog.open) { console.log('dialog open'); } else { console.log('dialog closed'); } } // update button opens a modal dialog updatebutton.addeventlistener('click', function() { dialog.showmodal(); opencheck(dialog); }); // form cancel button closes the dialog box cancelbutton.addeventlistener('click', function() { dialog.close('animalnotchosen'); opencheck(dialog); }); })(); </script> note: you can find this example on github as htmldialogelement-basic (see it live also).

HTMLDialogElement - Web APIs
from there you can click the cancel button to close the dialog (via the htmldialogelement.close() function), or submit the form via the submit button.
... --> <dialog id="favdialog"> <form method="dialog"> <section> <p><label for="favanimal">favorite animal:</label> <select id="favanimal" name="favanimal"> <option></option> <option>brine shrimp</option> <option>red panda</option> <option>spider monkey</option> </select></p> </section> <menu> <button id="cancel" type="reset">cancel</button> <button type="submit">confirm</button> </menu> </form> </dialog> <menu> <button id="updatedetails">update details</button> </menu> <script> (function() { var updatebutton = document.getelementbyid('updatedetails'); var cancelbutton = document.getelementbyid('cancel'); var dialog = document.getelementbyid('favdialo...
...; dialog.returnvalue = 'favanimal'; function opencheck(dialog) { if(dialog.open) { console.log('dialog open'); } else { console.log('dialog closed'); } } // update button opens a modal dialog updatebutton.addeventlistener('click', function() { dialog.showmodal(); opencheck(dialog); }); // form cancel button closes the dialog box cancelbutton.addeventlistener('click', function() { dialog.close('animalnotchosen'); opencheck(dialog); }); })(); </script> note: you can find this example on github as htmldialogelement-basic (see it live also).

Dragging and Dropping Multiple Items - Web APIs
to reject the items, either don't cancel the dragover event, or set the effectallowed property to none.
... you may wish to do both in case another listener has already cancelled the event.
...utput" style="min-height: 100px; white-space: pre; border: 1px solid black;" ondragenter="document.getelementbyid('output').textcontent = ''; event.stoppropagation(); event.preventdefault();" ondragover="event.stoppropagation(); event.preventdefault();" ondrop="event.stoppropagation(); event.preventdefault(); dodrop(event);"> <div> fix</div> </div> </body> </html> this example cancels both the dragenter and dragover events by calling the preventdefault().

Basic concepts - Web APIs
success events don't bubble up and they can't be canceled.
... error events, on the other hand, do bubble, and can be cancelled.
... this is quite important, as error events abort whatever transactions they're running in, unless they are cancelled.

MouseEvent.initMouseEvent() - Web APIs
syntax event.initmouseevent(type, canbubble, cancelable, view, detail, screenx, screeny, clientx, clienty, ctrlkey, altkey, shiftkey, metakey, button, relatedtarget); parameters type the string to set the event's type to.
... cancelable whether or not the event's default action can be prevented.
... sets the value of event.cancelable.

PointerEvent - Web APIs
pointercancel a browser fires this event if it concludes the pointer will no longer be able to generate events (for example the related device is deactived).
... pointerout this event is fired for several reasons including: pointing device is moved out of the hit test boundaries of an element; firing the pointerup event for a device that does not support hover (see pointerup); after firing the pointercancel event (see pointercancel); when a pen stylus leaves the hover range detectable by the digitizer.
... globaleventhandlers.onpointercancel a global event handler for the pointercancel event.

Using Pointer Events - Web APIs
function startup() { var el = document.getelementsbytagname("canvas")[0]; el.addeventlistener("pointerdown", handlestart, false); el.addeventlistener("pointerup", handleend, false); el.addeventlistener("pointercancel", handlecancel, false); el.addeventlistener("pointermove", handlemove, false); log("initialized."); } this simply sets up all the event listeners for our <canvas> element so we can handle the touch events as they occur.
... handling canceled touches if the user's finger wanders into browser ui, or the touch otherwise needs to be canceled, the pointercancel event is sent, and we call the handlecancel() function below.
... function handlecancel(evt) { log("pointercancel: id = " + evt.pointerid); var idx = ongoingtouchindexbyid(evt.pointerid); ongoingtouches.splice(idx, 1); // remove it; we're done } since the idea is to immediately abort the touch, we simply remove it from the ongoing touch list without drawing a final line segment.

ProgressEvent.initProgressEvent() - Web APIs
do not use it anymore, use the standard constructor, progressevent(), to create a synthetic progressevent syntax progress.initprogressevent(typearg, canbubblearg, cancelablearg, lengthcomputable, loaded, total); parameters typearg is a domstring identifying the specific type of animation event that occurred.
... abort the operation was cancelled and didn't complete.
... cancelablearg is a boolean flag indicating if the event associated action can be avoided (true) or not (false).

ReadableStreamDefaultController.close() - Web APIs
if you want to completely get rid of the stream and discard any enqueued chunks, you'd use readablestream.cancel() or readablestreamdefaultreader.cancel().
...a cancel() function is also provided to stop the generation if readablestream.cancel() is called for any reason.
...e(string); // show it on the screen let listitem = document.createelement('li'); listitem.textcontent = string; list1.appendchild(listitem); }, 1000); button.addeventlistener('click', function() { clearinterval(interval); fetchstream(); controller.close(); }) }, pull(controller) { // we don't really need a pull in this example }, cancel() { // this is called if the reader cancels, // so we should stop generating strings clearinterval(interval); } }); specifications specification status comment streamsthe definition of 'close()' in that specification.

SVGGraphicsElement: cut event - Web APIs
bubbles yes cancelable yes interface clipboardevent event handler property oncut the eventʼs default action is to copy the current selection (if any) to the system clipboard and remove it from the document.
... a handler for this event can modify the clipboard contents by calling setdata(format, data) on the event's clipboardevent.clipboarddata property, and cancelling the default action using event.preventdefault().
... note though that cancelling the default action will also prevent the document from being updated.

SVGSVGElement - Web APIs
svgsvgelement.unsuspendredraw() cancels a specified suspendredraw() by providing a unique suspend handle id that was returned by a previous suspendredraw() call.
... svgsvgelement.unsuspendredrawall() cancels all currently active suspendredraw() method calls.
... this method is most useful at the very end of a set of svg dom calls to ensure that all pending suspendredraw() method calls have been cancelled.

StorageEvent - Web APIs
="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="176" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">storageevent</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} method overview void initstorageevent( in domstring type, in boolean canbubble, in boolean cancelable, in domstring key, in domstring oldvalue, in domstring newvalue, in usvstring url, in storage storagearea ); attributes attribute type description key domstring represents the key changed.
... syntax storageevent.initstorageevent(type[, canbubble[, cancelable[, key[, oldvalue[, newvalue[, url[, storagearea]]]]]]]) parameters typearg the name of the event.
... cancelable optional a boolean indicating whether the event is cancelable.

Streams API concepts - Web APIs
there are two types of underlying source: push sources constantly push data at you when you’ve accessed them, and it is up to you to start, pause, or cancel access to the stream.
... there is also a construct you’ll use called a controller — each reader has an associated controller that allows you to control the stream (for example, to cancel it if wished).
...if you want another reader to start reading your stream, you typically need to cancel the first reader before you do anything else (although you can tee streams, see the teeing section below) note that there are two different types of readable stream.

Multi-touch interaction - Web APIs
example this example demonstrates using the touchstart, touchmove, touchcancel, and touchend) touch events for the following gestures: single touch, two (simultaneous) touches, more than two simultaneous touches, 1-finger swipe, and 2-finger move/pinch/swipe.
...the touchend and touchcancel event types use the same handler.
... function set_handlers(name) { // install event handlers for the given element var el=document.getelementbyid(name); el.ontouchstart = start_handler; el.ontouchmove = move_handler; // use same handler for touchcancel and touchend el.ontouchcancel = end_handler; el.ontouchend = end_handler; } function init() { set_handlers("target1"); set_handlers("target2"); set_handlers("target3"); set_handlers("target4"); } move/pinch/zoom handler this function provides very basic support for 2-touch horizontal move/pinch/zoom handling.

Touch events - Web APIs
function startup() { var el = document.getelementbyid("canvas"); el.addeventlistener("touchstart", handlestart, false); el.addeventlistener("touchend", handleend, false); el.addeventlistener("touchcancel", handlecancel, false); el.addeventlistener("touchmove", handlemove, false); } document.addeventlistener("domcontentloaded", startup); this simply sets up all the event listeners for our <canvas> element so we can handle the touch events as they occur.
... handling canceled touches if the user's finger wanders into browser ui, or the touch otherwise needs to be canceled, the touchcancel event is sent, and we call the handlecancel() function below.
... function handlecancel(evt) { evt.preventdefault(); console.log("touchcancel."); var touches = evt.changedtouches; for (var i = 0; i < touches.length; i++) { var idx = ongoingtouchindexbyid(touches[i].identifier); ongoingtouches.splice(idx, 1); // remove it; we're done } } since the idea is to immediately abort the touch, we simply remove it from the ongoing touch list without drawing a final line segment.

Movement, orientation, and motion: A WebXR example - Web APIs
we record the returned request id in case we need to cancel the request later.
... function sessionended() { xrbutton.innertext = "enter webxr"; if (animationframerequestid) { xrsession.cancelanimationframe(animationframerequestid); animationframerequestid = 0; } xrsession = null; } we can also call sessionended() directly if we wish to programmatically end the webxr session.
... in either case, the label of the button is updated to indicate that a click will start a session, and then, if there is a pending request for an animation frame, we cancel it by calling cancelanimationframe once that's done, the value of xrsession is changed to null to indicate that we're done with the session.

Using the Web Animations API - Web APIs
animation.cancel() aborts the animation and removes its effects.
... oncancel is the event handler for the cancel event and can be triggers with cancel().
... nommingcake.onfinish = endgame; drinking.onfinish = endgame; // ...or alice reaches the end of her animation alicechange.onfinish = endgame; better still, the web animations api also provides a finish promise that will resolve when the animation finishes, or reject if it is canceled.

Window: unhandledrejection event - Web APIs
bubbles no cancelable yes interface promiserejectionevent event handler property onunhandledrejection usage notes allowing the unhandledrejection event to bubble will eventually result in an error message being output to the console.
...you can prevent that from happening by adding a handler for unhandledrejection events that—in addition to any other tasks you wish to perform—calls preventdefault() to cancel the event, preventing it from bubbling up to be handled by the runtime's logging code.
... this works because unhandledrejection is cancelable.

WindowOrWorkerGlobalScope.clearTimeout() - Web APIs
the cleartimeout() method of the windoworworkerglobalscope mixin cancels a timeout previously established by calling settimeout().
... syntax scope.cleartimeout(timeoutid) parameters timeoutid the identifier of the timeout you want to cancel.
... var alarm = { remind: function(amessage) { alert(amessage); this.timeoutid = undefined; }, setup: function() { if (typeof this.timeoutid === 'number') { this.cancel(); } this.timeoutid = window.settimeout(function(msg) { this.remind(msg); }.bind(this), 1000, 'wake up!'); }, cancel: function() { window.cleartimeout(this.timeoutid); } }; window.onclick = function() { alarm.setup(); }; notes passing an invalid id to cleartimeout() silently does nothing; no exception is thrown.

Using XMLHttpRequest - Web APIs
load the transfer is complete; all data is now in the response var oreq = new xmlhttprequest(); oreq.addeventlistener("progress", updateprogress); oreq.addeventlistener("load", transfercomplete); oreq.addeventlistener("error", transferfailed); oreq.addeventlistener("abort", transfercanceled); oreq.open(); // ...
... } else { // unable to compute progress information since the total size is unknown } } function transfercomplete(evt) { console.log("the transfer is complete."); } function transferfailed(evt) { console.log("an error occurred while transferring the file."); } function transfercanceled(evt) { console.log("the transfer has been canceled by the user."); } lines 3-6 add event listeners for the various events that are sent while performing a data transfer using xmlhttprequest.
...the upload events are fired on the xmlhttprequest.upload object, as shown below: var oreq = new xmlhttprequest(); oreq.upload.addeventlistener("progress", updateprogress); oreq.upload.addeventlistener("load", transfercomplete); oreq.upload.addeventlistener("error", transferfailed); oreq.upload.addeventlistener("abort", transfercanceled); oreq.open(); note: progress events are not available for the file: protocol.

XRSession.onsqueezeend - Web APIs
if heldobject has an object reference, that object is passed to a function called cancelobjectdrag(), which would be written to return the object to its original position.
... this takes care of the situation in which the drag is aborted or canceled.
... xrsession.onsqueezeend = event => { if (event.inputsource.handedness == user.handedness) { let targetraypose = event.frame.getpose(event.inputsource.targetrayspace, myrefspace; if (user.heldobject) { cancelobjectdrag(user.heldobject); } } }; this code presumes that if the user actually intentionally completed the drag, user.heldobject will be null here.

Creating a cross-browser video player - Developer guides
fullscreen the fullscreen api should be straight forward to use: the user clicks a button, if the video is in fullscreen mode: cancel it, otherwise enter fullscreen mode.
...ke the other buttons, a click event handler is attached in which we call a user defined function handlefullscreen: fullscreen.addeventlistener('click', function(e) { handlefullscreen(); }); the handlefullscreen function is defined as follows: var handlefullscreen = function() { if (isfullscreen()) { if (document.exitfullscreen) document.exitfullscreen(); else if (document.mozcancelfullscreen) document.mozcancelfullscreen(); else if (document.webkitcancelfullscreen) document.webkitcancelfullscreen(); else if (document.msexitfullscreen) document.msexitfullscreen(); setfullscreendata(false); } else { if (videocontainer.requestfullscreen) videocontainer.requestfullscreen(); else if (videocontainer.mozrequestfullscreen) videocontainer.mozreque...
...interestingly document must be used for exiting/cancelling fullscreen mode, whereas any html element can request fullscreen mode, here the videocontainer is used as it also contains the custom controls which should also appear with the video in fullscreen mode.

Creating and triggering events - Developer guides
function simulateclick() { const event = new mouseevent('click', { view: window, bubbles: true, cancelable: true }); const cb = document.getelementbyid('checkbox'); const cancelled = !cb.dispatchevent(event); if (cancelled) { // a handler called preventdefault.
... alert("cancelled"); } else { // none of the handlers called preventdefault.
... alert("not cancelled"); } } ...

timers - Archive of obsolete content
example var { settimeout, cleartimeout } = require("sdk/timers"); var id = settimeout(function() { // do something in 1 sec }, 1000); // to stop/cancel this timeout cleartimeout(id); setinterval(callback, ms) schedules callback to be called repeatedly every ms milliseconds.
... example var { setinterval, clearinterval } = require("sdk/timers"); var id = setinterval(function() { // do something every 1 sec // to stop/cancel this interval clearinterval(id); }, 1000); ...

JavaScript timers - Archive of obsolete content
clearinterval() cancels repeated action which was set up using setinterval().
... clearimmediate() cancels the immediate actions, just like cleartimeout() for settimeout().

Adding Events and Commands - Archive of obsolete content
you can capture and cancel events during any of these phases, provided that they aren't canceled before they reach the point where you intended to capture them.
... in general, you should avoid adding event handlers in the capturing phase, or canceling events.

Appendix B: Install and Uninstall Scripts - Archive of obsolete content
then the user has the option to restart right away, wait to restart whenever is convenient, or even cancel the uninstall operation.
...so, you should listen to other events, like canceling the operation, to make sure that you know what is going on.

Handling Preferences - Archive of obsolete content
the user can click on the cancel button and none of the changes performed in the window will apply.
...firefox will know if it needs to add ok and cancel buttons or not.

Updating addons broken by private browsing changes - Archive of obsolete content
idownloadmanager nsidownload nsihttpauthmanager nsistricttransportsecurityservice ff 20: nsiprivatebrowsingservice nsirecentbadcertservice furthermore, if your code uses any of these common chrome apis: ff 19: saveurl saveinternal openlinkin ff 20: openbrowserwindow gprivatebrowsingui finally, if your code watches for any of these observer notifications: private-browsing private-browsing-cancel-vote private-browsing-change-granted private-browsing-transition-complete then your addon will require updating to correctly support the new per-window private browser feature in firefox 20 (and will require updating to work correctly in releases of firefox since the ones listed).
... nsidownload now has retry, cancel, remove, pause, and resume methods which should be used instead of deprecated similarly-named nsidownloadmanager methods.

MozAudioAvailable - Archive of obsolete content
general info specification dom l3 interface event bubbles no cancelable no target element default action none.
... cancelable read only boolean is it possible to cancel the event?

MozBeforeResize - Archive of obsolete content
general info specification mozilla specific interface event bubbles no cancelable no target window default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean whether the event is cancellable or not.

cached - Archive of obsolete content
general info specification offline interface event bubbles no cancelable no target applicationcache default action none properties property type description target eventtarget (dom element) the event target (the topmost target in the dom tree).
... cancelable boolean is it possible to cancel the event?

checking - Archive of obsolete content
general info specification offline interface event bubbles no cancelable no target applicationcache default action none properties property type description target eventtarget (dom element) the event target (the topmost target in the dom tree).
... cancelable boolean is it possible to cancel the event?

downloading - Archive of obsolete content
general info specification offline interface event bubbles no cancelable no target applicationcache default action none properties property type description target eventtarget (dom element) the event target (the topmost target in the dom tree).
... cancelable boolean is it possible to cancel the event?

error - Archive of obsolete content
general info specification offline interface event bubbles no cancelable no target applicationcache default action none properties property type description target eventtarget (dom element) the event target (the topmost target in the dom tree).
... cancelable boolean is it possible to cancel the event?

noupdate - Archive of obsolete content
general info specification offline interface event bubbles no cancelable no target applicationcache default action none properties property type description target eventtarget (dom element) the event target (the topmost target in the dom tree).
... cancelable boolean is it possible to cancel the event?

obsolete - Archive of obsolete content
general info specification offline interface event bubbles no cancelable no target applicationcache default action none properties property type description target eventtarget (dom element) the event target (the topmost target in the dom tree).
... cancelable boolean is it possible to cancel the event?

progress - Archive of obsolete content
general info specification offline interface progressevent bubbles no cancelable no target applicationcache default action none properties property type description target eventtarget (dom element) the event target (the topmost target in the dom tree).
... cancelable boolean is it possible to cancel the event?

updateready - Archive of obsolete content
general info specification offline interface event bubbles no cancelable no target applicationcache default action none properties property type description target eventtarget (dom element) the event target (the topmost target in the dom tree).
... cancelable boolean is it possible to cancel the event?

Install.js - Archive of obsolete content
this.profileinstall = install.confirm('install ' + this.extfullname + ' ' + this.extversion + ' to your profile directory (ok) or your browser directory (cancel)?'); } // init install var dispname = this.extfullname + ' ' + this.extversion; var regname = '/' + this.extauthor + '/' + this.extshortname; install.initinstall(dispname, regname, this.extversion); // find directory to install into var installpath; if (this.profileinstall) installpath = profiledir; else installpath = install.getfolder('chrome'); // add jar file ins...
...arguments; if (args == 'p=0') { this.profileinstall = false; this.silentinstall = true; } else if (args == 'p=1') { this.profileinstall = true; this.silentinstall = true; } }, handleerror: function(err) { if (!this.silentinstall) { install.alert('error: could not install ' + this.extfullname + ' ' + this.extversion + ' (error code: ' + err + ')'); } install.cancelinstall(err); } }; xpiinstaller.install(); ...

Download Manager preferences - Archive of obsolete content
0 indicates that the downloads should be paused and resumed automatically the next time firefox is run; 1 indicates that the downloads should be paused but will not automatically resume when the application is restarted; and 2 indicates that the downloads will be canceled on quit.
...0 indicates that the download should be removed upon completion; 1 indicates that completed and canceled downloads should be removed on quit; 2 indicates that downloads should never be removed automatically.

Document Loading - From Load Start to Finding a Handler - Archive of obsolete content
some facilities are provided for starting loads, canceling loads, and other such micromanagement.
...if it does so, we abort the entire dispatch process right here and cancel the necko request; we will not be getting a stream listener to stream data into, since the content handler has taken over completely.

generateCRMFRequest() - Archive of obsolete content
the dialog describes the key generation process and gives the user the opportunity to cancel the operation.
... "error:usercancel" the user has canceled the key generation operation "error:internalerror" the software encountered some internal error, such as out of memory ...

Tamarin Build System Documentation - Archive of obsolete content
build when all build slaves are idle the next build begins before the build begins buildbot waits for 2 minutes of no checkin activity the build system prioritizes tamarin-redux checkins over sandbox builds when several tamarin-redux checkins occur the newest change is built including all checkins since the last build each sandbox build occurs in the order they were submitted, the submitter may cancel a build.
... if buildbot is busy the queue is displayed http://tamarin-builds.mozilla.org/build_trigger/requestbuild.cfm the submitter of a sandbox build may remove a build request by clicking on the cancel button tamarin-redux builds are higher priority than sandbox builds, they cannot be removed but the most checkin including all new checkins are built how can i run buildbot scripts locally?

Using XPInstall to Install Plugins - Archive of obsolete content
here is an example: var plid = "myplugin.plug/version=6.5"; err = initinstall(software_name, plid, version); if (err != 0) { // install may have failed because of n6 and = // replace plid with a simple string err = initinstall(software_name, "mypluginstring", version); if (err != 0) cancelinstall(err); } note that above, the plid contains an "=" and in case the xpi package is running on browsers that treat "=" as an illegal token, the workaround is to handle the error and invoke initinstall again.
... err = getlasterror(); if (!err) performinstall(); else cancelinstall(err); installing plugin files to the current browser installing to the current browser is the task that is the most important for the xpi package to succeed in.

Windows Install - Archive of obsolete content
note the disk space verification, the editing of the windows registry, the writing to the installation log, and the error checking before either performinstall or cancelinstall is called.
..., "bin", // dir name in jar to extract fprogram, // where to put this file // (returned from getfolder) "", // subdir name to create relative to fprogram true); // force flag logcomment("adddirectory() returned: " + err); // check return value if(err == success) { err = performinstall(); logcomment("performinstall() returned: " + err); } else cancelinstall(err); } else cancelinstall(insufficient_disk_space); // end main ...

diskSpaceAvailable - Archive of obsolete content
g, ...); if (err == 0) performinstall(); else cancelinstall(); } else { alert("not enough disk space.
... no install); cancelinstall(); } ...

Methods - Archive of obsolete content
cancelinstall aborts the installation of the software.
... confirm displays a confirm dialog box with the specified message and ok and cancel buttons.

Return Codes - Archive of obsolete content
no_matching_certificate -206 extracted file was not signed by the certificate used to sign the installation script cant_read_archive -207 xpi package cannot be read invalid_arguments -208 bad parameters to a function illegal_relative_path -209 illegal relative path user_cancelled -210 user clicked cancel on install dialog install_not_started -211 a problem occurred with the parameters to initinstall, or initinstall was not called first silent_mode_denied -212 the silent installation privilege has not been granted.
... filename_already_used -226 same filename being used in install install_cancelled -227 raised when installation is cancelled in medias res.

accesskey - Archive of obsolete content
for example, when an the accesskey for an 'ok' button is 'o', and the accesskey for the button labeled 'キャンセル' (which means 'cancel') is 'c', the labels will be 'ok(o)' and 'キャンセル(c)'.
... example <vbox> <label value="enter name" accesskey="e" control="myname"/> <textbox id="myname"/> <button label="cancel" accesskey="n"/> <button label="ok" accesskey="o"/> </vbox> see also label attribute acceltext attribute xul accesskey faq and policies ...

Attribute (XUL) - Archive of obsolete content
« xul reference home acceltext accessible accesskey activetitlebarcolor afterselected align allowevents allownegativeassertions alternatingbackground alwaysopenpopup attribute autocheck autocompleteenabled autocompletepopup autocompletesearch autocompletesearchparam autofill autofillaftermatch autoscroll beforeselected buttonaccesskeyaccept buttonaccesskeycancel buttonaccesskeydisclosure buttonaccesskeyextra1 buttonaccesskeyextra2 buttonaccesskeyhelp buttonalign buttondir buttondisabledaccept buttonlabelaccept buttonlabelcancel buttonlabeldisclosure buttonlabelextra1 buttonlabelextra2 buttonlabelhelp buttonorient buttonpack buttons checked checkstate clicktoscroll class closebutton closemenu coalesceduplicatearcs collapse collapsed colo...
...gth maxpos maxrows maxwidth member menu menuactive min minheight minresultsforpopup minwidth mode modifiers mousethrough movetoclick multiline multiple name negate newlines next noautofocus noautohide noinitialfocus nomatch norestorefocus object observes onbeforeaccept onbookmarkgroup onchange onclick onclosetab oncommand oncommandupdate ondialogaccept ondialogcancel ondialogclosure ondialogextra1 ondialogextra2 ondialoghelp onerror onerrorcommand onextra1 onextra2 oninput onload onnewtab onpageadvanced onpagehide onpagerewound onpageshow onpaneload onpopuphidden onpopuphiding onpopupshowing onpopupshown onsearchcomplete onselect ontextcommand ontextentered ontextrevert ontextreverted onunload onwizardback onwizardcancel onwizard...

CheckboxStateChange - Archive of obsolete content
general info specification xul interface event bubbles yes cancelable yes target element default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean is it possible to cancel the event?

DOMMenuItemActive - Archive of obsolete content
general info specification xul interface event bubbles yes cancelable yes target element default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean whether the event is cancellable or not.

DOMMenuItemInactive - Archive of obsolete content
general info specification xul interface event bubbles yes cancelable yes target element default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean whether the event is cancellable or not.

RadioStateChange - Archive of obsolete content
general info specification xul interface event bubbles yes cancelable yes target element default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean is it possible to cancel the event?

ValueChange - Archive of obsolete content
general info specification xul interface event bubbles yes cancelable yes target element default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean is it possible to cancel the event?

broadcast - Archive of obsolete content
general info specification xul interface event bubbles no cancelable no target element default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean whether the event is cancellable or not.

close - Archive of obsolete content
general info specification xul interface event bubbles no cancelable no target window default action the window is closed.
... cancelable read only boolean whether the event is cancellable or not.

command - Archive of obsolete content
general info specification xul interface xulcommandevent bubbles yes cancelable yes target element default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... bubbles read only boolean whether the event normally bubbles or not cancelable read only boolean whether the event is cancellable or not?

commandupdate - Archive of obsolete content
general info specification xul interface event bubbles no cancelable no target element default action none.
... cancelable read only boolean whether the event is cancellable or not.

popuphidden - Archive of obsolete content
general info specification xul interface popupevent bubbles yes cancelable yes target element default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean whether the event is cancellable or not.

popuphiding - Archive of obsolete content
general info specification xul interface popupevent bubbles yes cancelable yes target element default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean whether the event is cancellable or not.

popupshowing - Archive of obsolete content
general info specification xul interface popupevent bubbles yes cancelable yes target element default action a popup is displayed properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean whether the event is cancellable or not.

popupshown - Archive of obsolete content
general info specification xul interface popupevent bubbles yes cancelable yes target element default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean whether the event is cancellable or not.

ContextMenus - Archive of obsolete content
to cancel a context menu event, you can use the preventdefault method of the event object.
... function checkcontextmenu(event) { if (event.target.localname == "textbox") event.preventdefault(); } function init() { var container = document.getelementbyid("container"); container.addeventlistener("contextmenu", checkcontextmenu, true); } the 'checkcontextmenu' function checks to see if the textbox was the target of the context menu and, if so, cancels the event using the preventdefault method.

Menus - Archive of obsolete content
the user may select a command to invoke it, or may cancel the operation by pressing escape or clicking outside the menu.
...when a menu command is selected or the menu is cancelled, the menupopup disappears from the screen again.

OpenClose - Archive of obsolete content
the user may cancel selecting a command from a menu by pressing the escape key.
...a user may also cancel selecting from a menu by clicking outside the menu.

PopupEvents - Archive of obsolete content
the popuphiding event is fired regardless of how the popup was hidden, whether because the user selected an item from a menu, or if the user clicked outside the popup, or if the user pressed escape to cancel the menu.
...you also cannot cancel the hiding of a menupopup when a user has made a selection from a menu, as it is already too late to do so.

Localization - Archive of obsolete content
"&bytes.before;2520&bytes.after;"/> </treerow> </treeitem> </treechildren> </tree> <splitter id="splitbar" resizeafter="grow" style="display: none;"/> <spacer class="titlespace"/> <hbox> <progressmeter id="progmeter" value="50%" style="display: none;"/> <spacer flex="1"/> <button id="find-button" label="&button.find;" oncommand="dofind()"/> <button id="cancel-button" label="&button.cancel;" oncommand="window.close();"/> </hbox> </vbox> </window> each text string has been replaced by an entity reference.
..."size"> <!entity type.date "date modified"> <!entity mode.is "is"> <!entity mode.isnot "is not"> <!entity casesensitive "case sensitive search"> <!entity matchfilename "match entire filename"> <!entity results.filename "filename"> <!entity results.location "location"> <!entity results.size "size"> <!entity bytes.before ""> <!entity bytes.after "bytes"> <!entity button.find "find"> <!entity button.cancel "cancel"> now, to add text for a new language all you need to do is create another dtd file.

Open and Save Dialogs - Archive of obsolete content
returncancel - the user pressed cancel.
... var res = fp.show(); if (res != nsifilepicker.returncancel){ var thefile = fp.file; // --- do something with the file here --- } next, we'll see how to create a wizard.

Using the Editor from XUL - Archive of obsolete content
in both cases, the editorcanclose() method is the javascript is called, which causes the nseditorshell to display a dialog asking the user if they want to save the document, throw away their changes, or cancel.
... note that if they cancel, the close operation is aborted.

XUL Questions and Answers - Archive of obsolete content
possible values include: accept, cancel, help, open, save, find, clear, yes, no, apply, close, print, add, remove, refresh, go-forward, go-back, properties, select-font, select-color, network.
... this problem can be solved by capturing the focus events and giving the focus to another xul element or capturing and canceling the keypress events.

button - Archive of obsolete content
cancel the cancel button which will cancel the operation.
...possible values include: accept, cancel, help, open, save, find, clear, yes, no, apply, close, print, add, remove, refresh, go-forward, go-back, properties, select-font, select-color, network.

2006-09-29 - Archive of obsolete content
27 status meeting cancelled most of the mozilla calendar participants were unavailable during sept.
... 27, the meeting was cancelled and rescheduled for a later date.

Debug - Archive of obsolete content
2 debug.ms_async_callback_status_cancel the synchronous work item was canceled.
... 1 debug.ms_async_op_status_canceled the asynchronous operation was canceled.

Mobile touch controls - Game development
pure javascript approach we could implement touch events on our own — setting up event listeners and assigning relevant functions to them would be quite straightforward: var el = document.getelementsbytagname("canvas")[0]; el.addeventlistener("touchstart", handlestart); el.addeventlistener("touchmove", handlemove); el.addeventlistener("touchend", handleend); el.addeventlistener("touchcancel", handlecancel); this way, touching the game's <canvas> on the mobile screen would emit events, and thus we could manipulate the game in any way we want (for example, moving the space ship around).
... touchmove is fired when they move the finger on the screen while touching it touchend is fired when the user stops touching the screen touchcancel is fired when a touch is cancelled, for example when the user moves their finger outside of the screen.

JavaScript basics - Learn web development
when you run the example and get the dialog box that prompts you to enter your user name, try pressing the cancel button.
...this happens because—when you cancel the prompt—the value is set as null.

Drawing graphics - Learn web development
the loop ends when you stop calling requestanimationframe() or if you call window.cancelanimationframe() after calling requestanimationframe() but before the frame is called.
... note: it's good practice to call cancelanimationframe() from your main code when you're done using the animation, to ensure that no updates are still waiting to be run.

Accessibility in React - Learn web development
moving focus back to the edit button at first glance, getting react to move focus back to our "edit" button when the edit is saved or cancelled appears deceptively easy.
... again try using the "edit" and "cancel" buttons to toggle between the templates of your <todo /> component; you'll see the browser focus indicator move appropriately, without the problem we discussed at the start of this section.

Starting our Svelte Todo list app - Learn web development
<div class="stack-small"> <form class="stack-small"> <div class="form-group"> <label for="todo-1" class="todo-label"> new name for 'create a svelte starter app' </label> <input type="text" id="todo-1" autocomplete="off" class="todo-text" /> </div> <div class="btn-group"> <button class="btn todo-cancel" type="button"> cancel <span class="visually-hidden">renaming create a svelte starter app</span> </button> <button class="btn btn__primary todo-edit" type="submit"> save <span class="visually-hidden">new name for create a svelte starter app</span> </button> </div> </form> </div> ...
... when the task is being edited, the list item has an input and two button to cancel or save modifications.

Application cache implementation overview
on canceled state loadcompleted invokes onerror event and 'finishes' the update (what transits the state to finished).
... canceled can be set only by call to nsofflinecacheupdate::cancel() public method that also cancels all running items downloads immediately.

Eclipse CDT Manual Setup
(if an "indexing" item starts after the "refreshing the workspace" item has finished, click the little red box beside that item to cancel it, since we want to configure the project before the indexer runs.) initial project properties so that the indexer will run faster and give better results, and so that eclipse doesn't give results for irrelevant files, you should add some resource filters to have eclipse ignore certain non-source files and directories.
...if indexing started automatically (see the progress tab), cancel it, since there seems to be a bug that makes it give bad results when it starts automatically at this stage.

Frame script loading and lifetime
if you use allowdelayedload, you can cancel it by using removedelayedframescript: var mm = window.messagemanager; mm.removedelayedframescript("chrome://my-e10s-extension/content/frame-script.js"); this means we will stop loading the script into new tabs.
...ner('unload', function(aevent) { if (aevent.target == gcontentframemessagemanager) { sendasyncmessage('my-addon-id', 'framescript-died'); // if you did not set third argument of `services.mm.addmessagelistener` to `true`, then this will fail to send a message } }, false); note about unload during uninstallation/upgrade when your add-on is uninstalled, or disabled, you should: cancel it, if you have used allowdelayedload, by calling removedelayedframescript; ensuring the frame script is not loaded into any new tabs.

mozbrowseractivitydone
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowserasyncscroll
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowseraudioplaybackchange
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowsercaretstatechanged
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowserclose
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean whether the event is cancellable or not.

mozbrowsercontextmenu
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowserdocumentfirstpaint
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean whether the event is cancellable or not.

mozbrowsererror
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowserfindchange
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowserfirstpaint
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean whether the event is cancellable or not.

mozbrowsericonchange
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowserloadend
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowserloadstart
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the event target (the topmost target in the dom tree).
... cancelable read only boolean whether the event is cancellable or not.

mozbrowserlocationchange
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowsermanifestchange
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowsermetachange
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowseropensearch
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowseropentab
the mozbrowseropentab event is fired when a new tab is opened within a browser <iframe> as a result of the user issuing a command to open a link target in a new tab (for example ctrl/cmd + click.) general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowseropenwindow
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowserresize
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowserscroll
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowserscrollareachanged
this can occur on resize and when the page size changes (while loading for example.) general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowserscrollviewchange
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowsersecuritychange
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowserselectionstatechanged
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowsershowmodalprompt
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowsertitlechange
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

mozbrowservisibilitychange
general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... cancelable read only boolean whether the event is cancellable or not.

MozScrolledAreaChanged
specification mozilla specific interface uievent bubbles yes cancelable yes target defaultview, document default action none properties property type description targetread only eventtarget the event target (the topmost target in the dom tree).
... cancelableread only boolean whether the event is cancellable or not.

smartcard-insert
the smartcard-insert event is fired when the insertion of a smart card has been detected specification mozilla specific interface event bubbles no cancelable no target document default action none properties property type description targetread only eventtarget the event target (the topmost target in the dom tree).
... cancelableread only boolean whether the event is cancellable or not.

smartcard-remove
specification mozilla specific interface event bubbles no cancelable no target document default action none properties property type description targetread only eventtarget the event target (the topmost target in the dom tree).
... cancelableread only boolean whether the event is cancellable or not.

HTTP Cache
external canceling of the loading channel) concurrent readers would not be able to reach the remaning unread content.
... this could be improved by keeping the network load running and being stored to the cache entry even after the writing channel has been canceled.

Webapps.jsm
) notifyupdatehandlers: function(aapp, amanifest, azippath) _getappdir: function(aid) _writefile: function(apath, adata) dogetlist: function() doexport: function(amsg, amm) doimport: function(amsg, amm) doextractmanifest: function(amsg, amm) dolaunch: function (adata, amm) launch: function launch(amanifesturl, astartpoint, atimestamp, aonsuccess, aonfailure) close: function close(aapp) canceldownload: function canceldownload(amanifesturl, aerror) startofflinecachedownload: function(amanifest, aapp, aprofiledir, aisupdate) computemanifesthash: function(amanifest) updateapphandlers: function(aoldmanifest, anewmanifest, aapp) checkforupdate: function(adata, amm) doinstall: function doinstall(adata, amm) doinstallpackage: function doinstallpackage(adata, amm) pushcontentaction: fun...
...ction(windowid) popcontentaction: function(windowid) actioncancelled: function(windowid) denyinstall: function(adata) _setupapp: function(adata, aid) _cloneapp: function(adata, anewapp, alocalemanifest, amanifest, aid, alocalid) _writemanifestfile: function(aid, aispackage, ajsonmanifest) _nextlocalid: function() _appidformanifesturl: function(auri) makeappid: function() _saveapps: function() _readmanifests: function(adata) _ensuresufficientstorage: function(anewapp) _checkdownloadsize: function(afreebytes, anewapp) _getrequestchannel: function(afullpackagepath, aislocalfileinstall, aoldapp,) _senddownloadprogressevent: function(anewapp, aprogress) _getpackage: function(arequestchannel, aid, aoldapp, anewapp) _computefilehash: function(afilepath) _sendappliedevent: function(aap...

L20n HTML Bindings
consider the following source html: <p data-l10n-id="save"> <input type="submit"> <a href="/main" class="btn-cancel"></a> </p> assume the following malicious translation: <save """ <input value="save" type="text"> or <a href="http://myevilwebsite.com" onclick="alert('pwnd!')" title="back to the homepage">cancel</a>.
... """> the result will be: <p data-l10n-id="back"> <input value="save" type="submit"> or <a href="/main" class="btn-cancel" title="back to the homepage">cancel</a>.

Index
return codes o 0 - no error o 1 - user cancelled o 2 - usage error o 6 - nls init error o 8 - certificate db open error o 9 - key db open error o 10 - file initialization error o 11 - unicode conversion error o 12 - temporary file creation error o 13 - pkcs11 get slot error o 14 - pkcs12 decoder start error o 15 - error read from import file o 16 - pkcs12 decode error o ...
... 229 fc_cancelfunction nss no summary!

sslerr.html
e with export regulations." ssl_error_protocol_version_alert -12190 "peer reports incompatible or unsupported protocol version." ssl_error_insufficient_security_alert -12189 "server requires ciphers more secure than those supported by client." ssl_error_internal_error_alert -12188 "peer reports it experienced an internal error." ssl_error_user_canceled_alert -12187 "peer user canceled handshake." ssl_error_no_renegotiation_alert -12186 "peer does not permit renegotiation of ssl security parameters." ssl_error_unsupported_extension_alert -12184 "ssl peer does not support requested tls hello extension." ssl_error_certificate_unobtainable_alert -12183 "ssl peer could not obtain your certificate ...
... sec_error_user_cancelled -8105 the user clicked cancel.

S/MIME functions
.2 and later nss_cmscontentinfo_setcontent_digesteddata mxr 3.2 and later nss_cmscontentinfo_setcontent_encrypteddata mxr 3.2 and later nss_cmscontentinfo_setcontent_envelopeddata mxr 3.2 and later nss_cmscontentinfo_setcontent_signeddata mxr 3.2 and later nss_cmsdecoder_cancel mxr 3.2 and later nss_cmsdecoder_finish mxr 3.2 and later nss_cmsdecoder_start mxr 3.2 and later nss_cmsdecoder_update mxr 3.2 and later nss_cmsdigestcontext_cancel mxr 3.2 and later nss_cmsdigestcontext_finishmultiple mxr 3.2 and later ...
...ter nss_cmsdigestcontext_update mxr 3.2 and later nss_cmsdigesteddata_create mxr 3.2 and later nss_cmsdigesteddata_destroy mxr 3.2 and later nss_cmsdigesteddata_getcontentinfo mxr 3.2 and later nss_cmsderencode mxr 3.2 and later nss_cmsencoder_cancel mxr 3.2 and later nss_cmsencoder_finish mxr 3.2 and later nss_cmsencoder_start mxr 3.2 and later nss_cmsencoder_update mxr 3.2 and later nss_cmsencrypteddata_create mxr 3.2 and later nss_cmsencrypteddata_destroy mxr 3.2 and later n...

Necko Interfaces Overview
channel is used to download the resource once) download initiated via nsichannel::asyncopen method can be canceled via nsirequest::cancel method at anytime after invocation of asyncopen method nsiprotocolhandler a service that manages a protocol, identified by it's uri scheme (eg.
...fies completion of async download, possibly w/ error nsiloadgroup : nsirequest attribute of a nsirequest channel impl adds itself to its load group during invocation of asyncopen channel impl removes itself from its load group when download completes load groups in gecko own all channels used to load a particular page (until the channels complete) all channels owned by a load group can be canceled at once via the load group's nsirequest::cancel method nsitransport represents a physical connection, such as a file descriptor or a socket used directly by protocol handler implementations (as well as by mailnews and chatzilla) synchronous i/o methods: openinputstream, openoutputstream asynchronous i/o methods: asyncread, asyncwrite nsitransport::asyncread takes a nsistreamlistener par...

How to embed the JavaScript engine
*/ ok = js_callfunctionname(cx, target, "onclick", argv, &rval); /* now test rval to see whether we should cancel the event.
... */ if (rval.isboolean() && !rval.toboolean()) cancelevent(event); again, i've elided error checking (such as testing for !ok after the call), and i've faked up some c event management routines that emulate the dom's convention of canceling an event if its handler returns false.

extIApplication
it is possible for the shutdown to be canceled.
...it is possible for the restart to be canceled.

nsIBadCertListener2
it can also be used to obtain the ssl handshake status of a connection that will be canceled because of improper certificate status.
... return value the consumer shall return true if it wants to suppress the error message related to the bad cert (the connection will still get canceled).

nsIDNSListener
inherits from: nsisupports last changed in gecko 1.7 method overview void onlookupcomplete(in nsicancelable arequest, in nsidnsrecord arecord, in nsresult astatus); methods onlookupcomplete() called when an asynchronous host lookup completes.
... void onlookupcomplete( in nsicancelable arequest, in nsidnsrecord arecord, in nsresult astatus ); parameters arequest the value returned from asyncresolve.

nsIDNSRequest
inherits from: nsisupports last changed in gecko 1.7 method overview void cancel(); methods cancel() called to cancel a pending asynchronous dns request.
...void cancel(); parameters none.

nsIDOMMozTouchEvent
last changed in gecko 2.0 (firefox 4 / thunderbird 3.3 / seamonkey 2.1) inherits from: nsidommouseevent method overview void initmoztouchevent(in domstring typearg, in boolean canbubblearg, in boolean cancelablearg, in nsidomabstractview viewarg, in long detailarg, in long screenxarg, in long screenyarg, in long clientxarg, in long clientyarg, in boolean ctrlkeyarg, in boolean altkeyarg, in boolea...
...void initsimplegestureevent( in domstring typearg, in boolean canbubblearg, in boolean cancelablearg, in nsidomabstractview viewarg, in long detailarg, in long screenxarg, in long screenyarg, in long clientxarg, in long clientyarg, in boolean ctrlkeyarg, in boolean altkeyarg, in boolean shiftkeyarg, in boolean metakeyarg, in unsigned short buttonarg, in nsidomeventtarget relatedtargetarg, in unsigned long streamidarg ); parameters streamidarg the value to assig...

nsIDOMWindowUtils
wheel_event_expected_overflow_delta_y_positive 0x0200 wheel_event_expected_overflow_delta_y_negative 0x0400 mousescroll_prefer_widget_at_point 1 mousescroll_scroll_lines 2 mousescroll_win_scroll_lparam_not_null 65536 touch_hover 1 touch_contact 2 touch_remove 4 touch_cancel 8 ime_status_disabled 0 users cannot use ime at all.
...this must be one of "touchstart", "touchend", "touchmove", or "touchcancel".

nsIDownload
completed states are nsidownloadmanager::download_finished, nsidownloadmanager::download_failed, and nsidownloadmanager::download_canceled.
... cancelable nsicancelable an object that can be used to cancel the download.

nsILoginManagerCrypto
can throw if the user cancels entry of their master password, or if the ciphertext value can not be successfully decrypted (for example, if it was encrypted with some other key).
...can throw if the user cancels entry of their master password.

All keyboard shortcuts - Firefox Developer Tools
command windows macos linux select the element under the mouse and cancel picker mode click click click select the element under the mouse and stay in picker mode shift+click shift+click shift+click html pane these shortcuts work while you're in the inspector's html pane.
...+ e execute the current expression enter return enter add a new line, for entering multiline expressions shift + enter shift + return shift + enter autocomplete popup these shortcuts apply while the autocomplete popup is open: command windows macos linux choose the current autocomplete suggestion tab tab tab cancel the autocomplete popup esc esc esc move to the previous autocomplete suggestion up arrow up arrow up arrow move to the next autocomplete suggestion down arrow down arrow down arrow page up through autocomplete suggestions page up page up page up page down through autocomplete suggestions page down page down page down...

Animation - Web APIs
event handlers animation.oncancel gets and sets the event handler for the cancel event.
... methods animation.cancel() clears all keyframeeffects caused by this animation and aborts its playback.

AnimationEvent.initAnimationEvent() - Web APIs
syntax animationevent.initanimationevent(typearg, canbubblearg, cancelablearg, animationnamearg, elapsedtimearg); parameters typearg a domstring identifying the specific type of animation event that occurred.
... cancelablearg a boolean flag indicating if the event associated action can be avoided (true) or not (false).

AudioParam - Web APIs
audioparam.cancelscheduledvalues() cancels all scheduled future changes to the audioparam.
... audioparam.cancelandholdattime() cancels all scheduled future changes to the audioparam but holds its value at a given time until further changes are made using other methods.

CompositionEvent.initCompositionEvent() - Web APIs
syntax compositioneventinstance.initcompositionevent(typearg, canbubblearg, cancelablearg, viewarg, dataarg, localearg) parameters typearg a domstring representing the type of composition event; this will be one of compositionstart, compositionupdate, or compositionend.
... cancelablearg a boolean shether or not the event can be canceled.

CustomEvent.initCustomEvent() - Web APIs
syntax event.initcustomevent(type, canbubble, cancelable, detail); parameters type is a domstring containing the name of the event.
... cancelable is a boolean indicating whether the event is cancelable.

DataTransfer - Web APIs
datatransfer.mozusercancelled read only this property applies only to the dragend event, and is true if the user canceled the drag operation by pressing escape.
... living standard mozcursor, mozitemcount, mozsourcenode, mozusercancelled, addelement(), mozcleardataat(), mozgetdataat(), mozsetdataat() and moztypesat are gecko specific.

DedicatedWorkerGlobalScope - Web APIs
windowtimers.clearinterval() cancels the repeated execution set using windowtimers.setinterval().
... windowtimers.cleartimeout() cancels the repeated execution set using windowtimers.settimeout().

Document: pointermove event - Web APIs
the pointermove event is fired when a pointer changes coordinates, and the pointer has not been canceled by a browser touch-action.
... bubbles yes cancelable yes interface pointerevent event handler property onpointermove examples using addeventlistener(): document.addeventlistener('pointermove', (event) => { console.log('pointer moved'); }); using the onpointermove event handler property: document.onpointermove = (event) => { console.log('pointer moved'); }; specifications specification status pointer events obsolete ...

Document: pointerout event - Web APIs
the pointerout event is fired for several reasons including: pointing device is moved out of the hit test boundaries of an element; firing the pointerup event for a device that does not support hover (see pointerup); after firing the pointercancel event (see pointercancel); when a pen stylus leaves the hover range detectable by the digitizer.
... bubbles yes cancelable yes interface pointerevent event handler property onpointerout examples using addeventlistener(): document.addeventlistener('pointerout', (event) => { console.log('pointer moved out'); }); using the onpointerout event handler property: document.onpointerout = (event) => { console.log('pointer moved out'); }; specifications specification status pointer events obsolete ...

Document: selectstart event - Web APIs
if the event is canceled, the selection is not changed.
... bubbles yes cancelable yes interface event event handler property onselectstart examples // addeventlistener version document.addeventlistener('selectstart', () => { console.log('selection started'); }); // onselectstart version document.onselectstart = () => { console.log('selection changed.'); }; specifications specification status comment selection apithe definition of 'selectstart' in that specification.

Document: transitionend event - Web APIs
bubbles yes cancelable yes interface transitionevent event handler property ontransitionend the transitionend event is fired in both directions - as it finishes transitioning to the transitioned state, and when it fully reverts to the default or non-transitioned state.
...if the transitioncancel event is fired, the transitionend event will not fire.

EffectTiming.fill - Web APIs
elem.style.transform = 'translatey(100px)'; elem.animate({ transform: 'none', offset: 0 }, 200); for some complex effects where animations layer on top of one another, it may be necessary to use a fill mode temporarily to capture the final value of an animation before canceling it.
... animation.commitstyles(); animation.cancel(); }); specifications specification status comment web animationsthe definition of 'fill' in that specification.

Element: MSGestureHold event - Web APIs
bubbles unknown cancelable unknown interface msgestureevent event handler property unknown the uievent.detail property of an msgesturehold event has 3 possible values: msgesture_flag_begin this value indicates that the user started contacting the touch surface.
... msgesture_flag_end & msgesture_flag_cancel (bitwise and-ed together) this value indicates that the user has moved their finger, regardless of whether they also stopped touching the touch surface specifications not part of any specification.

Element: beforescriptexecute event - Web APIs
cancelling the event prevents the script from executing.
... bubbles yes cancelable yes interface event event handler property none specifications not part of any specification.

Element: compositionend event - Web APIs
the compositionend event is fired when a text composition system such as an input method editor completes or cancels the current composition session.
... bubbles yes cancelable yes interface compositionevent event handler property none examples const inputelement = document.queryselector('input[type="text"]'); inputelement.addeventlistener('compositionend', (event) => { console.log(`generated characters were: ${event.data}`); }); live example html <div class="control"> <label for="name">on macos, click in the textbox below,<br> then type <kbd>option</kbd> + <kbd>`</kbd>, then <kbd>a</kbd>:</label> <input type="text" id="example" name="example"> </div> <div class="event-log"> <label>event log:</label> <textarea readonly class="event-log-contents" rows="8" cols="25"><...

Element: copy event - Web APIs
bubbles yes cancelable yes interface clipboardevent event handler property oncopy the event's default action is to copy the selection (if any) to the clipboard.
... a handler for this event can modify the clipboard contents by calling setdata(format, data) on the event's clipboardevent.clipboarddata property, and cancelling the event's default action using event.preventdefault().

Element: fullscreenchange event - Web APIs
bubbles yes cancelable no interface event event handler property onfullscreenchange this event is sent to the element which is transitioning into or out of full-screen mode.
...on the other hand, if document.fullscreenelement is null, full-screen mode has been canceled.

Element: mouseenter event - Web APIs
bubbles no cancelable no interface mouseevent event handler property onmouseenter usage notes though similar to mouseover, mouseenter differs in that it doesn't bubble and it isn't sent to any descendants when the pointer is moved from one of its descendants' physical space to its own physical space.
... a single mouseover event is sent to the deepest element of the dom tree, then it bubbles up the hierarchy until it is canceled by a handler or reaches the root.

Element: mouseleave event - Web APIs
bubbles no cancelable no interface mouseevent event handler property onmouseleave mouseleave and mouseout are similar but differ in that mouseleave does not bubble and mouseout does.
... one single mouseout event is sent to the deepest element of the dom tree, then it bubbles up the hierarchy until it is canceled by a handler or reaches the root.

Element: paste event - Web APIs
bubbles yes cancelable yes interface clipboardevent event handler property onpaste if the cursor is in an editable context (for example, in a <textarea> or an element with contenteditable attribute set to true) then the default action is to insert the contents of the clipboard into the document at the cursor position.
... to override the default behavior (for example to insert some different data or a transformation of the clipboard contents) an event handler must cancel the default action using event.preventdefault(), and then insert its desired data manually.

Event() - Web APIs
cancelable optional a boolean indicating whether the event can be cancelled.
... example // create a look event that bubbles up and cannot be canceled const evt = new event("look", {"bubbles":true, "cancelable":false}); document.dispatchevent(evt); // event can be dispatched from any element, not only the document mydiv.dispatchevent(evt); specifications specification status comment domthe definition of 'event()' in that specification.

EventTarget.addEventListener() - Web APIs
(function() { if (!event.prototype.preventdefault) { event.prototype.preventdefault=function() { this.returnvalue=false; }; } if (!event.prototype.stoppropagation) { event.prototype.stoppropagation=function() { this.cancelbubble=true; }; } if (!element.prototype.addeventlistener) { var eventlisteners=[]; var addeventlistener=function(type,listener /*, usecapture (will be ignored) */) { var self=this; var wrapper=function(e) { e.target=e.srcelement; e.currenttarget=self; if (typeof listener.handleevent != 'undefined') { listener.handleevent(e); }...
...since it can't be canceled, event listeners can't block page rendering anyway.

EventTarget.dispatchEvent() - Web APIs
syntax cancelled = !target.dispatchevent(event) parameter event is the event object to be dispatched.
... return value the return value is false if event is cancelable and at least one of the event handlers which received event called event.preventdefault().

Fullscreen API - Web APIs
no support 9 — 65alternate name alternate name uses the non-standard name: mozcancelfullscreenie full support 11alternate name full support 11alternate name alternate name uses the non-standard name: msexitfullscreenopera full support 15prefixed full support 15prefixed prefixed implemented with the ve...
... no support 9 — 65alternate name alternate name uses the non-standard name: mozcancelfullscreenopera android full support yessafari ios no support nosamsung internet android full support 5.0 full support 5.0 full support yesprefixed prefixed implemented with t...

Using the Gamepad API - Web APIs
to start with, we declare some variables: the gamepadinfo paragraph that the connection info is written into, the ball that we want to move, the start variable that acts as the id for requestanimation frame, the a and b variables that act as position modifiers for moving the ball, and the shorthand variables that will be used for the requestanimationframe() and cancelanimationframe() cross browser forks.
... window.addeventlistener("gamepaddisconnected", function(e) { gamepadinfo.innerhtml = "waiting for gamepad."; cancelrequestanimationframe(start); }); chrome does things differently here.

HTMLDialogElement.returnValue - Web APIs
<!-- simple pop-up dialog box containing a form --> <dialog id="favdialog"> <form method="dialog"> <p><label>favorite animal: <select name="favanimal" required> <option></option> <option>brine shrimp</option> <option>red panda</option> <option>spider monkey</option> </select> </label></p> <menu> <button>cancel</button> <button>confirm</button> </menu> </form> </dialog> <menu> <button id="updatedetails">update details</button> </menu> <script> (function() { var updatebutton = document.getelementbyid('updatedetails'); var dialog = document.getelementbyid('favdialog'); dialog.returnvalue = 'favanimal'; function opencheck(dialog) { if (di...
...alog.open) { console.log('dialog open'); } else { console.log('dialog closed'); } } function handleuserinput(returnvalue) { if (returnvalue === 'cancel' || returnvalue == null) { // user canceled the dialog, do nothing } else if (returnvalue === 'confirm') { // user chose a favorite animal, do something with it } } // “update details” button opens the <dialog> modally updatebutton.addeventlistener('click', function() { dialog.showmodal(); opencheck(dialog); handleuserinput(dialog.returnvalue); }); })(); </script> note: you can find this example on github as htmldialogelement-basic (see it live also).

HTMLElement: animationend event - Web APIs
bubbles yes cancelable no interface animationevent event handler property onanimationend examples this example gets an element that's being animated and listens for the animationend event: const animated = document.queryselector('.animated'); animated.addeventlistener('animationend', () => { console.log('animation ended'); }); the same, but using the onanimationend event handler property: const animated = document.queryselector('.animated'); animated.onanimationend = () => { console.l...
...ncount++; animationeventlog.textcontent = `${animationeventlog.textcontent}'animation iterations: ${iterationcount}' `; }); animation.addeventlistener('animationend', () => { animationeventlog.textcontent = `${animationeventlog.textcontent}'animation ended'`; animation.classlist.remove('active'); applyanimation.textcontent = "activate animation"; }); animation.addeventlistener('animationcancel', () => { animationeventlog.textcontent = `${animationeventlog.textcontent}'animation canceled'`; }); applyanimation.addeventlistener('click', () => { animation.classlist.toggle('active'); animationeventlog.textcontent = ''; iterationcount = 0; let active = animation.classlist.contains('active'); if (active) { applyanimation.textcontent = "cancel animation"; } else { applya...

HTMLElement: animationiteration event - Web APIs
bubbles yes cancelable no interface animationevent event handler property onanimationiteration examples this code uses animationiteration to keep track of the number of iterations an animation has completed: const animated = document.queryselector('.animated'); let iterationcount = 0; animated.addeventlistener('animationiteration', () => { iterationcount++; console.log(`animation iteration count: ${iterationcount}`); }); the same, but using the onanimationiteration event han...
...ncount++; animationeventlog.textcontent = `${animationeventlog.textcontent}'animation iterations: ${iterationcount}' `; }); animation.addeventlistener('animationend', () => { animationeventlog.textcontent = `${animationeventlog.textcontent}'animation ended'`; animation.classlist.remove('active'); applyanimation.textcontent = "activate animation"; }); animation.addeventlistener('animationcancel', () => { animationeventlog.textcontent = `${animationeventlog.textcontent}'animation canceled'`; }); applyanimation.addeventlistener('click', () => { animation.classlist.toggle('active'); animationeventlog.textcontent = ''; iterationcount = 0; let active = animation.classlist.contains('active'); if (active) { applyanimation.textcontent = "cancel animation"; } else { applya...

HTMLElement: animationstart event - Web APIs
bubbles yes cancelable no interface animationevent event handler property onanimationstart examples this listens for the animationstart event and logs a message when it is fired: const animated = document.queryselector('.animated'); animated.addeventlistener('animationstart', () => { console.log('animation started'); }); the same, but using onanimationstart: const animated = docum...
...ncount++; animationeventlog.textcontent = `${animationeventlog.textcontent}'animation iterations: ${iterationcount}' `; }); animation.addeventlistener('animationend', () => { animationeventlog.textcontent = `${animationeventlog.textcontent}'animation ended'`; animation.classlist.remove('active'); applyanimation.textcontent = "activate animation"; }); animation.addeventlistener('animationcancel', () => { animationeventlog.textcontent = `${animationeventlog.textcontent}'animation canceled'`; }); applyanimation.addeventlistener('click', () => { animation.classlist.toggle('active'); animationeventlog.textcontent = ''; iterationcount = 0; let active = animation.classlist.contains('active'); if (active) { applyanimation.textcontent = "cancel animation"; } else { applya...

HTMLElement: pointermove event - Web APIs
the pointermove event is fired when a pointer changes coordinates, and the pointer has not been canceled by a browser touch-action.
... bubbles yes cancelable yes interface pointerevent event handler property onpointermove usage notes the event, which is of type pointerevent, provides all the information you need to know about the user's interaction with the pointing device, including the position, movement distance, button states, and much more.

HTMLElement: pointerout event - Web APIs
the pointerout event is fired for several reasons including: pointing device is moved out of the hit test boundaries of an element; firing the pointerup event for a device that does not support hover (see pointerup); after firing the pointercancel event (see pointercancel); when a pen stylus leaves the hover range detectable by the digitizer.
... bubbles yes cancelable yes interface pointerevent event handler property onpointerout examples using addeventlistener(): const para = document.queryselector('p'); para.addeventlistener('pointerout', (event) => { console.log('pointer moved out'); }); using the onpointerout event handler property: const para = document.queryselector('p'); para.onpointerout = (event) => { console.log('pointer moved out'); }; specifications specification status pointer events obsolete ...

HTMLElement: transitionrun event - Web APIs
bubbles yes cancelable no interface transitionevent event handler property ontransitionrun examples this code adds a listener to the transitionrun event: el.addeventlistener('transitionrun', () => { console.log('transition is running but hasn\'t necessarily started transitioning yet'); }); the same, but using the ontransitionrun property instead of addeventlistener(): el.ontransitionrun = () => { console.log('transition started running, and will start transitioning when the transition delay has expired'); }; live example in the following example, we have a simple <div> element, styled with a transition t...
... the transitionrun will occur even if the transition is canceled before the delay expires.

HTMLFormElement - Web APIs
fires an event named invalid at any control that does not satisfy its constraints; such controls are considered invalid if the event is not canceled.
...when false is returned, cancelable invalid events are fired for each invalid child and validation problems are reported to the user.

HTMLSelectElement - Web APIs
if the element fails its constraints, the browser fires a cancelable invalid event at the element (and returns false).
...if there are problems, it fires a cancelable invalid event at the element, and returns false; if there are no problems, it returns true.

HTMLTextAreaElement - Web APIs
in this case, it also fires a cancelable invalid event at the control.
...if there are problems, it fires a cancelable invalid event at the element, and returns false; if there are no problems, it returns true.

KeyboardEvent.initKeyboardEvent() - Web APIs
syntax kbdevent.initkeyboardevent(typearg, canbubblearg, cancelablearg, viewarg, chararg, keyarg, locationarg, modifierslistarg, repeat) parameters typearg the type of keyboard event; this will be one of keydown, keypress, or keyup.
... cancelablearg whether or not the event can be canceled.

LockedFile.abort() - Web APIs
summary the abort method is used to release the lock on the lockedfile object, making it inactive: its active property is set to false and all ongoing operations are canceled.
... note: when an ongoing operation is canceled, there is no rollback (it is not a database transaction), therefore the file can be corrupted if the canceled operation was performing some writing.

PaymentRequest.show() - Web APIs
the promise is also rejected with aborterror if the user cancels the payment request.
... payrequest = new paymentrequest(methoddata, details, options); payrequest.onshippingaddresschange = ev => ev.updatewith(checkaddress(payrequest)); payrequest.onshippingoptionchange = ev => ev.updatewith(checkshipping(payrequest)); const repsonse = await payrequest.show(); await validateresponse(response); } catch(err) { /* handle the error; aborterror usually means a user cancellation */ } } in this code, the methods checkaddress() and checkshipping(), respectively, check the shipping address and the shipping option changes and supply in response either a paymentdetailsupdate object or a promise to return one; this object contains the fields in the paymentresponse which have been or need to be changed.

Using the Payment Request API - Web APIs
const checkoutbutton = document.getelementbyid('checkout-button'); if (window.paymentrequest) { let request = new paymentrequest(buildsupportedpaymentmethodnames(), buildshoppingcartdetails()); checkoutbutton.addeventlistener('click', function() { request.show().then(function(paymentresponse) { // handle successful payment }).catch(function(error) { // handle cancelled or failed payment.
... paymentresponse.complete('success') .then(function() { // for demo purposes: intropanel.style.display = 'none'; successpanel.style.display = 'block'; }); }).catch(function(error) { if (error.code == domexception.not_supported_err) { window.location.href = 'https://bobpay.xyz/#download'; } else { // other kinds of errors; cancelled or failed payment.

PerformanceEventTiming - Web APIs
auxclick beforeinput click compositionend compositionstart compositionupdate contextmenu dblclick dragend dragenter dragleave dragover dragstart drop input keydown keypress keyup mousedown mouseenter mouseleave mouseout mouseover mouseup pointerover pointerenter pointerdown pointerup pointercancel pointerout pointerleave gotpointercapture lostpointercapture touchstart touchend touchcancel properties performanceeventtiming.processingstart returns the time at which event dispatch started.
... performanceeventtiming.cancelable returns the associated event's cancelable attribute.

RTCDataChannelEvent() - Web APIs
"cancelable", optional, inherited from eventinit.
... indicates if the event can be canceled or not.

ReadableStreamDefaultController.enqueue() - Web APIs
a cancel() function is also provided to stop the generation if readablestream.cancel() is called for any reason.
...e(string); // show it on the screen let listitem = document.createelement('li'); listitem.textcontent = string; list1.appendchild(listitem); }, 1000); button.addeventlistener('click', function() { clearinterval(interval); fetchstream(); controller.close(); }) }, pull(controller) { // we don't really need a pull in this example }, cancel() { // this is called if the reader cancels, // so we should stop generating strings clearinterval(interval); } }); specifications specification status comment streamsthe definition of 'enqueue()' in that specification.

ReadableStreamDefaultController - Web APIs
a cancel() function is also provided to stop the generation if readablestream.cancel() is called for any reason.
...e(string); // show it on the screen let listitem = document.createelement('li'); listitem.textcontent = string; list1.appendchild(listitem); }, 1000); button.addeventlistener('click', function() { clearinterval(interval); fetchstream(); controller.close(); }) }, pull(controller) { // we don't really need a pull in this example }, cancel() { // this is called if the reader cancels, // so we should stop generating strings clearinterval(interval); } }); specifications specification status comment streamsthe definition of 'readablestreamdefaultcontroller' in that specification.

SVGGraphicsElement: copy event - Web APIs
bubbles yes cancelable yes interface clipboardevent event handler property oncopy the event's default action is to copy the selection (if any) to the clipboard.
... a handler for this event can modify the clipboard contents by calling setdata(format, data) on the event's clipboardevent.clipboarddata property, and cancelling the event's default action using event.preventdefault().

SVGGraphicsElement: paste event - Web APIs
bubbles yes cancelable yes interface clipboardevent event handler property onpaste if the cursor is in an editable context (for example, in a <textarea> or an element with contenteditable attribute set to true) then the default action is to insert the contents of the clipboard into the document at the cursor position.
... to override the default behavior (for example to insert some different data or a transformation of the clipboard contents) an event handler must cancel the default action using event.preventdefault(), and then insert its desired data manually.

SharedWorkerGlobalScope - Web APIs
windowtimers.clearinterval() cancels the repeated execution set using windowtimers.setinterval().
... windowtimers.cleartimeout() cancels the repeated execution set using windowtimers.settimeout().

SpeechSynthesisErrorEvent.error - Web APIs
possible codes are: canceled a speechsynthesis.cancel method call caused the speechsynthesisutterance to be removed from the queue before it had begun being spoken.
... interrupted a speechsynthesis.cancel method call caused the speechsynthesisutterance to be interrupted after it had begun being spoken and before it completed.

Streams API - Web APIs
there are more advantages too — you can detect when streams start or end, chain streams together, handle errors and cancel streams as required, and react to the speed of the stream is being read at.
...for example, the response body returned by a successful fetch request can be exposed as a readablestream, and you can then read it using a reader created with readablestream.getreader(), cancel it with readablestream.cancel(), etc.

TransitionEvent.initTransitionEvent() - Web APIs
do not use it anymore, use the standard constructor, transitionevent(), to create a synthetic transitionevent syntax transitionevent.inittransitionevent(typearg, canbubblearg, cancelablearg, transitionnamearg, elapsedtimearg); parameters typearg is a domstring identifying the specific type of transition event that occurred.
... cancelablearg is a boolean flag indicating if the event associated action can be avoided (true) or not (false).

WebGLRenderingContext.makeXRCompatible() - Web APIs
ne = "scene1"; let glstartbutton; let xrstartbutton; window.addeventlistener("load", (event) => { loadsceneresources(currentscene); glstartbutton.addeventlistener("click", handlestartbuttonclick); xrstartbutton.addeventlistener("click", handlestartbuttonclick); }); outputcanvas.addeventlistener("webglcontextlost", (event) => { /* the context has been lost but can be restored */ event.canceled = true; }); /* when the gl context is reconnected, reload the resources for the current scene.
... */ outputcanvas.addeventlistener("webglcontextrestored", (event) => { loadsceneresources(currentscene); }); async function onstartedxrsession(xrsession) { try { await gl.makexrcompatible(); } catch(err) { switch(err) { case aborterror: showsimplemessagebox("unable to transfer the game to your xr headset.", "cancel"); break; case invalidstateerror: showsimplemessagebox("you don't appear to have a compatible xr headset available.", "cancel"); break; default: handlefatalerror(err); break; } xrsession.end(); } } async function handlestartbuttonclick(event) { if (event.target.classlist.contains("use-webxr") && navigator.xr) { try { xrsession = await navigator.xr.requestsession("immersive-vr"); ...

Signaling and video calling - Web APIs
function handlegetusermediaerror(e) { switch(e.name) { case "notfounderror": alert("unable to open your call because no camera and/or microphone" + "were found."); break; case "securityerror": case "permissiondeniederror": // do nothing; this is the same as the user canceling the call.
...in this example, we ignore "securityerror" and "permissiondeniederror" results, treating refusal to grant permission to use the media hardware the same as the user canceling the call.

Inputs and input sources - Web APIs
pickupobject() also records the original position of the object so it can be returned to that spot if the squeeze is canceled or aborted.
... canceling the squeeze in the squeezeend handler the squeezeend event is received after the squeeze is complete, even if it fails.

Window.confirm() - Web APIs
the window.confirm() method displays a modal dialog with an optional message and two buttons: ok and cancel.
... return value a boolean indicating whether ok (true) or cancel (false) was selected.

Window.prompt() - Web APIs
if the user clicks the cancel button, this function returns null.
... the above prompt appears as follows (in chrome on os x): notes a prompt dialog contains a single-line textbox, a cancel button, and an ok button, and returns the (possibly empty) text the user entered into that textbox.

Window: transitionend event - Web APIs
bubbles yes cancelable yes interface transitionevent event handler property ontransitionend the transitionend event is fired in both directions - as it finishes transitioning to the transitioned state, and when it fully reverts to the default or non-transitioned state.
...if the transitioncancel event is fired, the transitionend event will not fire.

WindowEventHandlers.onbeforeunload - Web APIs
at this point, the document is still visible and the event is still cancelable.
... window.addeventlistener('beforeunload', function (e) { // cancel the event e.preventdefault(); // if you prevent default behavior in mozilla firefox prompt will always be shown // chrome requires returnvalue to be set e.returnvalue = ''; }); guarantee the browser unload by removing the returnvalue property of the event window.addeventlistener('beforeunload', function (e) { // the absence of a returnvalue property on the event will guarantee the brow...

WindowOrWorkerGlobalScope.clearInterval() - Web APIs
the clearinterval() method of the windoworworkerglobalscope mixin cancels a timed, repeating action which was previously established by a call to setinterval().
... syntax scope.clearinterval(intervalid) parameters intervalid the identifier of the repeated action you want to cancel.

WindowOrWorkerGlobalScope.setInterval() - Web APIs
return value the returned intervalid is a numeric, non-zero value which identifies the timer created by the call to setinterval(); this value can be passed to windoworworkerglobalscope.clearinterval() to cancel the timeout.
...you can cancel the interval using windoworworkerglobalscope.clearinterval().

WindowOrWorkerGlobalScope - Web APIs
windoworworkerglobalscope.clearinterval() cancels the repeated execution set using windoworworkerglobalscope.setinterval().
... windoworworkerglobalscope.cleartimeout() cancels the delayed execution set using windoworworkerglobalscope.settimeout().

WorkerGlobalScope - Web APIs
windoworworkerglobalscope.clearinterval() cancels the repeated execution set using windoworworkerglobalscope.setinterval().
... windoworworkerglobalscope.cleartimeout() cancels the delayed execution set using windoworworkerglobalscope.settimeout().

XRSession.requestAnimationFrame() - Web APIs
you can cancel a previously scheduled animation by calling cancelanimationframe().
... return value an integer value which serves as a unique, non-zero id or handle you may pass to cancelanimationframe() if you need to remove the pending animation frame request.

XRSession - Web APIs
cancelanimationframe() removes a callback from the animation frame painting callback from xrsession's set of animation frame rendering callbacks, given the identifying handle returned by a previous call to requestanimationframe().
...returns an integer value which can be used to identify the request for the purposes of canceling the callback using cancelanimationframe().

Operable - Accessibility
understanding pointer gestures 2.5.2 pointer cancellation (a) added in 2.1 for functionality that can be operated using a single-pointer at least one of the following is true: no down-event, abort/undo, up reversal or essential.
... understanding pointer cancellation 2.5.3 label in name (a) added in 2.1 for each user interface component that includes a visible text label, make sure the accessible name matches (or includes) the visible text in the label.

Codecs used by WebRTC - Web media technologies
these two rfcs also lay out options that must be supported for each codec, as well as specific user comfort features such as echo cancelation.
... it's useful to note that rfc 7874 defines more than a list of audio codecs that a webrtc-compliant browser must support; it also provides recommendations and requirements for special audio features such as echo cancelation, noise reduction, and audio leveling.

Window: deviceproximity event - Archive of obsolete content
bubbles no cancelable no interface deviceproximityevent target defaultview (window) default action none event handler property window.ondeviceproximity specification proximity sensor other properties property type description value read only double (float) the measured proximity of the distant device (distance in centimetres).

Window: userproximity event - Archive of obsolete content
bubbles no cancelable no interface userproximityevent target defaultview (window) default action none event handler property window.onuserroximity specification proximity sensor note: this event has been disabled by default in firefox 62, behind the device.sensors.proximity.enabled preference (bug 1462308).

Content Processes - Archive of obsolete content
neither content or add-on proceses were ever actually implemented, but by the time they were cancelled, the sdk was already designed with them in mind.

Contributor's Guide - Archive of obsolete content
neither content or add-on proceses were ever actually implemented, but by the time they were cancelled, the sdk was already designed with them in mind.

simple-storage - Archive of obsolete content
important: if you use this method, you must end your debugging session by quitting firefox normally, not by cancelling the shell command.

platform/xpcom - Archive of obsolete content
r { class } = require('sdk/core/heritage'); var { unknown } = require('sdk/platform/xpcom'); var request = class({ extends: unknown, interfaces: [ 'nsirequest' ], initialize: function initialize() { this.pending = false; }, ispending: function() { return this.pending; }, resume: function() { console.log('resuming...'); }, suspend: function() { console.log('suspending...'); }, cancel: function() { console.log('canceling...'); } }); this component definition: specifies that we support nsirequest using the interfaces property.

Miscellaneous - Archive of obsolete content
however, if you are not going to cancel the request, you need to "rewind" it by calling: postdata.queryinterface(ci.nsiseekablestream).seek(ci.nsiseekablestream.ns_seek_set, 0); adding custom certificates to a xulrunner application you need to ship a xulrunner application with your own ssl certificates?

Displaying web content in an extension without security issues - Archive of obsolete content
ing the event handler on the frame tag (meaning that it is outside the restricted document and can execute without restrictions): <iframe type="content" onclick="handleclick(event);"/> and the event handler would look like that: function handlebrowserclick(event) { // only react to left mouse clicks if (event.button != 0) return; // default action on link clicks is to go to this link, cancel it event.preventdefault(); if (event.target instanceof htmlanchorelement && event.target.href) openlinkinbrowser(event.target.href); } safe html manipulation functions when it comes to displaying the data, it is tempting to generate some html code and to insert it into the document via innerhtml.

Appendix C: Avoiding using eval in Add-ons - Archive of obsolete content
note: there are still some scenarios where incompatibilities may arise, such as trying to cancel the function call under a certain set of conditions when other add-ons have overridden the same function.

Setting Up a Development Environment - Archive of obsolete content
it allows you to cancel them and even replace payload data before it is sent.

Tabbed browser - Archive of obsolete content
httpchannel, requesturl; if (topic == "http-on-modify-request") { httpchannel = subject.queryinterface(ci.nsihttpchannel); requesturl = httpchannel.uri.spec; var newrequesturl, i; if (/someurl/.test(requesturl)) { var goodies = loadcontextgoodies(httpchannel); if (goodies) { httpchannel.cancel(cr.ns_binding_aborted); goodies.contentwindow.location = self.data.url('pages/test.html'); } else { //dont do anything as there is no contentwindow associated with the httpchannel, liekly a google ad is loading or some ajax call or something, so this is not an error } } return; } } }; serv...

chargingchange - Archive of obsolete content
general info specification battery interface event bubbles no cancelable no target batterymanager default action none properties the event callback doesn't receive any event objects, but properties can be read from the batterymanager object received from the navigator.getbattery method.

chargingtimechange - Archive of obsolete content
general info specification battery interface event bubbles no cancelable no target batterymanager default action none properties the event callback doesn't receive any event objects, but properties can be read from the batterymanager object received from the navigator.getbattery method.

dischargingtimechange - Archive of obsolete content
general info specification battery interface event bubbles no cancelable no target batterymanager default action none properties the event callback doesn't receive any event objects, but properties can be read from the batterymanager object received from the navigator.getbattery method.

levelchange - Archive of obsolete content
general info specification battery interface event bubbles no cancelable no target batterymanager default action none properties the event callback doesn't receive any event objects, but properties can be read from the batterymanager object received from the navigator.getbattery method.

Notes on HTML Reflow - Archive of obsolete content
a caller may also cancel a reflow command that is in the queue; e.g., if the target frame is destroyed.

Making it into a dynamic overlay and packaging it up for distribution - Archive of obsolete content
nto the tinderstatus-installer directory: initinstall( "mozilla tinderstatus extension", "/mozdev/tinderstatus", "0.1"); var installdir = getfolder("chrome","tinderstatus"); setpackagefolder(installdir); adddirectory("tinderstatus"); registerchrome( content | delayed_chrome, getfolder(installdir, "content")); var result = performinstall(); if ( result != success ) cancelinstall(result); once all the files are in place, use your zip utility from within the tinderstatus-installer directory to create a zip archive called tinderstatus.xpi with install.js and the entire contents of the tinderstatus/ directory.

Helper Apps (and a bit of Save As) - Archive of obsolete content
if any read or write errors occur, abort the whole process: cancel the channel.

importUserCertificates - Archive of obsolete content
if it fails, one of the following error strings will be returned: error string description "error:usercancel" the user canceled the import operation "error:invalidcertificate" one of the certificate packages was incorrectly formatted "error:internalerror" the software encountered some internal error, such as out of memory "error:invalidrequestid" the request id in the response message does not match any outstanding request ...

JavaScript crypto - Archive of obsolete content
example of cryptomechanismflags and cipherflags pkcs11mechanismflags = pkcs11_mech_dsa_flag | pkcs11_mech_skipjack_flag | pkcs11_mech_random_flag; pkcs11cipherflags = 0; return values js_ok_add_module = 3 // successfully added a module js_err_other = -1 // errors other than the following js_err_user_cancel_action = -2 // user aborted an action js_err_incorrect_num_of_arguments = -3 // calling a method w/ incorrect # of // arguments js_err_add_module = -5 // error adding a module js_err_bad_module_name = -6 // the module name is invalid js_err_add_module_duplicate = -10 // the module being installed has the ...

Migrate apps from Internet Explorer to Mozilla - Archive of obsolete content
cancelbubble stoppropagation() used to stop the event from bubbling farther up the tree.

Mozilla Application Framework in Detail - Archive of obsolete content
registerchrome(package | delayed_chrome, getfolder("chrome","xmlterm.jar"), "content/xmlterm/"); registerchrome(skin | delayed_chrome, getfolder("chrome","xmlterm.jar"), "skin/modern/xmlterm/"); registerchrome(locale | delayed_chrome, getfolder("chrome","xmlterm.jar"), "locale/xmlterm/"); if (getlasterror() == success) performinstall(); else { alert("error detected: "+getlasterror()); cancelinstall(); } other features a resource description framework (rdf) parser with support for creating rdf graphs programmatically or by parsing files, compositing multiple sources into a single rdf graph, querying and manipulating graphs, and populating xul widgets (trees, menus, etc.) with graph data; an xslt/xpath processor; scalable vector graphics (svg) rendering with support for a usable su...

Proxy UI - Archive of obsolete content
click "cancel" to discard changes.

Supporting per-window private browsing - Archive of obsolete content
var os = components.classes["@mozilla.org/observer-service;1"] .getservice(components.interfaces.nsiobserverservice); os.addobserver(function (asubject, atopic, adata) { asubject.queryinterface(components.interfaces.nsisupportsprbool); // if another extension has not already canceled entering the private mode if (!asubject.data) { /* you should display some user interface here */ asubject.data = true; // cancel the operation } }, "last-pb-context-exiting", false); forcing a channel into private mode usually, network channels inherit the privacy status of the document that created them, which means that they work correctly most of the time.

Example Sticky Notes - Archive of obsolete content
you cannot cancel this event, * but you may accomplish some last minute clean up.

Creating XPI Installer Modules - Archive of obsolete content
itinstall: " + err); addfile("barley grain", // displayname from contents.rdf "barley.jar", // jar source getfolder("chrome"), // target folder ""); // target subdir // registerchrome(type, location, source) registerchrome(package | delayed_chrome, getfolder("chrome","barley.jar"), "content/"); if (err==success) performinstall(); else cancelinstall(err); note that there is no version number on barley, and so the name + version parameter has a "v" and then nothing else.

File.macAlias - Archive of obsolete content
xpisrc = "miscellaneous program"; var vi = "1.1.1.1"; initinstall( "macintosh alias", "misc", vi, 0); f = getfolder("program"); g = getfolder("mac desktop"); addfile( "filemacalias", "2.2.2.2", xpisrc, f, xpisrc, true); err = file.macalias(f, xpisrc, g, xpisrc + " alias"); logcomment("file.macalias returns: " + err); if (0 == getlasterror()) performinstall(); else cancelinstall(); ...

File.windowsShortcut - Archive of obsolete content
f = getfolder("windows"); g = getfolder("temporary"); addfile( "miscshortcut", "2.2.2.2", xpisrc, f, xpisrc, true); target = getfolder(f, xpisrc); shortcutpath = getfolder("program"); err = file.windowsshortcut( target, shortcutpath, "misc shortcut", g, "", target, 0); logcomment("file.windowsshortcut returns: " + err); if (0 == getlasterror()) performinstall(); else cancelinstall(); ...

Install.addDirectory - Archive of obsolete content
var vi = "10.10.10.10"; var xpisrc = "adddir1"; initinstall("addfilenovers1", "adddir_1", vi, 1); f = getfolder("program"); setpackagefolder(f); err = adddirectory(xpisrc); logcomment("the error = " + err); if (0 == getlasterror()) performinstall(); else cancelinstall(); ...

Install.addFile - Archive of obsolete content
var xpisrc = "file.txt"; initinstall( "adding a file", "testfile", "1.0.1.7", 1); f = getfolder("program"); setpackagefolder(f); addfile(xpisrc); if (0 == getlasterror()) performinstall(); else cancelinstall(); ...

addFile - Archive of obsolete content
example var xpisrc = "file.txt"; initinstall("adding a file", "addfile", "1.0.1.7", 1); f = getfolder("program"); setpackagefolder(f); addfile(xpisrc); if (0 == getlasterror()) performinstall(); else cancelinstall(); ...

performInstall - Archive of obsolete content
err = getlasterror(); if (!err) performinstall(); else cancelinstall(err); ...

refreshPlugins - Archive of obsolete content
; var xpisrc2 = "nsic3dpscriptablepeer.xpt"; initinstall( "cult3d plugin file", "@cycore.com/cult3d;version=1.0.0", "1.0.0"); setpackagefolder(getfolder("plugins")); addfile(xpisrc); addfile("",xpisrc2,getfolder("components"),""); var err = getlasterror(); if (err == success) { err = performinstall(); if (err == success) refreshplugins(); } else cancelinstall(err); ...

Install Object - Archive of obsolete content
perform installation check that the files have been added successfully (e.g., by checking the error return codes from many of the main installation methods, and go ahead with the install if everything is in order: performorcancel(); function performorcancel() { if (0 == getlasterror()) performinstall(); else cancelinstall(); } for complete script examples, see script examples.

XPInstall API reference - Archive of obsolete content
objects install properties methods adddirectory addfile alert cancelinstall confirm deleteregisteredfile execute gestalt getcomponentfolder getfolder getlasterror getwinprofile getwinregistry initinstall loadresources logcomment patch performinstall refreshplugins registerchrome reseterror setpackagefolder installtri...

dlgtype - Archive of obsolete content
cancel the cancel button which will cancel the operation.

icon - Archive of obsolete content
possible values include: accept, cancel, help, open, save, find, clear, yes, no, apply, close, print, add, remove, refresh, go-forward, go-back, properties, select-font, select-color, network.

Building accessible custom components in XUL - Archive of obsolete content
if the user presses esc, we "cancel" the edit by simply recreating the original label and restoring its previous value.

How to Quit a XUL Application - Archive of obsolete content
getservice(components.interfaces.nsiappstartup); // eattemptquit will try to close each xul window, but the xul window can cancel the quit // process if there is unsaved data.

Methods - Archive of obsolete content
« xul reference home acceptdialog additemtoselection addpane addprogresslistener addsession addtab addtabsprogresslistener advance advanceselectedtab appendcustomtoolbar appendgroup appenditem appendnotification blur cancel canceldialog centerwindowonscreen checkadjacentelement clearresults clearselection click close collapsetoolbar contains decrease decreasepage docommand ensureelementisvisible ensureindexisvisible ensureselectedelementisvisible expandtoolbar extra1 extra2 focus getbrowseratindex getbrowserfordocument getbrowserfortab getbrowserindexfordocument getbutton getdefaultsession geteditor getelementsbyattribute getelementsbyattributens getformattedstring gethtmleditor getindexoffirstv...

buttons - Archive of obsolete content
cancel: the cancel button which will cancel the operation.

Template and Tree Listeners - Archive of obsolete content
note that you cannot cancel the operation from within the observer.

SeaMonkey - making custom toolbar (SM ver. 1.x) - Archive of obsolete content
working directory, create a plain text file named: install.js copy the following content, and paste it into the new file: const title = "custom toolbar button" const name = "custombutton" const version = "1.0" r = initinstall(title, name, version) || adddirectory(null, "content", getfolder("chrome"), name) || registerchrome(content + delayed_chrome, getfolder("chrome", name), "") if (r) cancelinstall(r) else performinstall(), alert("now restart seamonkey") customize the title, name and (optionally) version definitions, changing the text between double-quote characters on those three lines.

Adding more elements - Archive of obsolete content
in might be more appropriate if the find and cancel buttons always stayed along the bottom of the window.

Additional Install Features - Archive of obsolete content
for example, you might put the following as the last section of your script: if (getlasterror() == success) { performinstall(); } else { cancelinstall(); } error codes that could be returned by getlasterror() are listed in the mozilla source file nsinstall.h.

Creating a Skin - Archive of obsolete content
#find-button { list-style-image: url("chrome://global/skin/checkbox/images/cbox-check.jpg"); font-weight: bold; } #cancel-button { list-style-image: url("chrome://global/skin/icons/images/close-button.jpg"); } button:hover { color: #000066; } we add some images to the buttons and make the find button have bold text to indicate that it is the default button.

Creating an Installer - Archive of obsolete content
the user may choose to continue or cancel.

Keyboard Shortcuts - Archive of obsolete content
vk_cancel vk_back vk_tab vk_clear vk_return vk_enter vk_shift vk_control vk_alt vk_pause vk_caps_lock vk_escape vk_space vk_page_up vk_page_down vk_end vk_home vk_left vk_up vk_right vk_down vk_printscreen vk_insert vk_delete vk_0 vk_1 vk_2 vk_3 vk_4 vk_5 vk_6 vk_7 ...

XUL Accesskey FAQ and Policies - Archive of obsolete content
cancel buttons.

XUL Changes for Firefox 1.5 - Archive of obsolete content
this is used typically on gnome systems where possible values are: accept, cancel, help, open, save, find, clear, yes, no, apply, close, print, add, remove, refresh, go-forward, go-back, properties, select-font, select-color, network.

toolbarbutton - Archive of obsolete content
cancel the cancel button which will cancel the operation.

Extentsions FAQ - Archive of obsolete content
the problem is, while your extension is still active, user can cancel uninstallation, and when it is physically uninstalled, your code can't run.

2006-12-01 - Archive of obsolete content
discussions cancellable async requests discussions about a bug of calicalendar's async methods.

NPP_DestroyStream - Archive of obsolete content
npres_user_break: user canceled stream directly by clicking the stop button or indirectly by some action such as deleting the instance or initiating higher-priority network operations.

NPP_URLNotify - Archive of obsolete content
npres_user_break: user canceled stream directly by clicking the stop button or indirectly by some action such as deleting the instance or initiating higher-priority network operations.

Debug.msTraceAsyncCallbackCompleted - Archive of obsolete content
the possible values for status include: debug.ms_async_op_status_success debug.ms_async_op_status_canceled debug.ms_async_op_status_error note: some debugging tools do not display the information sent to the debugger.

Debug.msUpdateAsyncCallbackRelation - Archive of obsolete content
the possible values for relationtype include: debug.ms_async_callback_status_assign_delegate debug.ms_async_callback_status_join debug.ms_async_callback_status_chooseany debug.ms_async_callback_status_cancel debug.ms_async_callback_status_error for more information, see debug constants.

Window: devicelight event - Archive of obsolete content
bubbles no cancelable no interface sensorcallback target defaultview (window) other properties property type description value read only double (float) the sensor data for ambient light in lux.

Game monetization - Game development
remember that it can be cancelled, so it's not an indefinitely working solution.

How CSS is structured - Learn web development
a class is rated as being more specific, as in having more specificity than the element selector, so it cancels the other conflicting style declaration.

Advanced form styling - Learn web development
to remove via css, you can use input[type="search"]::-webkit-search-cancel-button { display: none; }.

Client-side form validation - Learn web development
reset the visual state of the message } else { // if there is still an error, show the correct error showerror(); } }); form.addeventlistener('submit', function (event) { // if the email field is valid, we let the form submit if(!email.validity.valid) { // if it isn't, we display an appropriate error message showerror(); // then we prevent the form from being sent by canceling the event event.preventdefault(); } }); function showerror() { if(email.validity.valuemissing) { // if the field is empty // display the following error message.

Use JavaScript within a webpage - Learn web development
additionally, if an animation lasts more than a couple seconds, give the user a way to cancel it.

Strategies for carrying out testing - Learn web development
if you cancel the process at this point, it can render the virtual machine unusable, and make it so you need to delete it and create it again.

Adding a new event
if your new event shouldn't be created with event constructor such as: var event = new fooevent("bar", { bubbles: true, cancelable: true, detail: 5 }); you shouldn't define construnctor in it.

Chrome registration
for example, the order of the "ok" and "cancel" buttons in a dialog is different, as well as the names of some items.

Debugging on Windows
hit "cancel".

Multiple Firefox profiles
cancel interrupts the profile deletion.

Using the Browser API
it was originally used in firefox os to implement browser applications before that project was cancelled; since firefox 47 it is available to desktop chrome code and used in places like the firefox devtools.

HTMLIFrameElement.sendTouchEvent()
possible values are touchstart, touchend, touchmove, or touchcancel.

Embedding Tips
use the callbacks for after-the-fact cancellation.

AddonManager
state_cancelled an install that has been canceled.

Code Samples
var beinguninstalled; let listener = { onuninstalling: function(addon) { if (addon.id == "youraddon@youraddon.com") { beinguninstalled = true; } }, onoperationcancelled: function(addon) { if (addon.id == "youraddon@youraddon.com") { beinguninstalled = (addon.pendingoperations & addonmanager.pending_uninstall) != 0; } } } try { components.utils.import("resource://gre/modules/addonmanager.jsm"); addonmanager.addaddonlistener(listener); } catch (ex) {} ...

DownloadList
removefinished() removes downloads from the list that have finished, have failed, or have been canceled without keeping partial data.

DownloadTarget
methods refresh() updates the state of a finished, failed, or canceled download based on the current state as indicated by the file system.

Downloads.jsm
this download method does not provide user interface or the ability to cancel or restart the download programmatically.

JavaScript code modules
the event listener receives detailed information about the request, and can modify or cancel the request.

Mozilla Content Localized in Your Language
for example, "cancel", "clear history", "add email", "select all", etc.

Refcount tracing and balancing
more likely, it indicates that one addref() is cancelled by another release() somewhere else in the code.

Introduction to NSPR
in the latter case, interruption does cancel the i/o operation.

PR_ClearInterrupt
in this case, the request for interrupt is still pending with the thread and must be explicitly canceled.

PR_Interrupt
the interrupt request remains in the thread's state until it is delivered exactly once or explicitly canceled.

PR_JoinJob
syntax #include <prtpool.h> nspr_api(prstatus) pr_joinjob(prjob *job); parameter the function has the following parameter: job a pointer to a prjob structure returned by a pr_queuejob function representing the job to be cancelled.

Thread Pools
thread pool types thread pool functions thread pool types prjobiodesc prjobfn prthreadpool prjob thread pool functions pr_createthreadpool pr_queuejob pr_queuejob_read pr_queuejob_write pr_queuejob_accept pr_queuejob_connect pr_queuejob_timer pr_canceljob pr_joinjob pr_shutdownthreadpool pr_jointhreadpool ...

NSS_3.12_release_notes.html
bug 132485: built-in root certs slot description is empty bug 177184: nss_cmsdecoder_cancel might have a leak bug 232392: erroneous root ca tests in nss libraries bug 286642: util should be in a shared library bug 287052: function to get crl entry reason code has incorrect prototype and implementation bug 299308: need additional apis in the crl cache for libpkix bug 335039: nssckfwcryptooperation_updatecombo is not declared bug 340917: crlutil should init nss read-only for some options ...

FIPS mode of operation
parallel function management functions fc_getfunctionstatus fc_cancelfunction ...

NSS tools : pk12util
return codes o 0 - no error o 1 - user cancelled o 2 - usage error o 6 - nls init error o 8 - certificate db open error o 9 - key db open error o 10 - file initialization error o 11 - unicode conversion error o 12 - temporary file creation error o 13 - pkcs11 get slot error o 14 - pkcs12 decoder start error o 15 - error read from import file o 16 - pkcs12 decode error o 17 - pkcs12 decoder verify error o 18 - pkcs12 decoder vali...

Utility functions
ickey mxr 3.2 and later seckey_publickeystrength mxr 3.2 and later seckey_updatecertpqg mxr 3.2 and later secmod_addnewmodule mxr 3.3 and later secmod_addnewmoduleex mxr 3.4 and later secmod_deletemoduleex mxr 3.12 and later secmod_cancelwait mxr 3.9.3 and later secmod_candeleteinternalmodule mxr 3.5 and later secmod_createmodule mxr 3.4 and later secmod_deletemodule mxr 3.4 and later secmod_findmodule mxr 3.4 and later secmod_findslot mxr 3.4 and later secmod_freem...

NSS Tools pk12util
error codes pk12util can return the following values: 0 - no error 1 - user cancelled 2 - usage error 6 - nls init error 8 - certificate db open error 9 - key db open error 10 - file initialization error 11 - unicode conversion error 12 - temporary file creation error 13 - pkcs11 get slot error 14 - pkcs12 decoder start error 15 - error read from import file 16 - pkcs12 decode error 17 - pkcs12 decoder verify error 18 - pkcs12 decoder validate bags error 19 - pkcs12 decoder imp...

NSS tools : pk12util
return codes o 0 - no error o 1 - user cancelled o 2 - usage error o 6 - nls init error o 8 - certificate db open error o 9 - key db open error o 10 - file initialization error o 11 - unicode conversion error o 12 - temporary file creation error o 13 - pkcs11 get slot error o 14 - pkcs12 decoder start error o 15 - error read from import file o 16 - pkcs12 decode error o ...

Index
202 js_clearpendingexception jsapi reference, spidermonkey js_clearpendingexception cancels the currently pending exception in cx, if any.

JS_ClearPendingException
description js_clearpendingexception cancels the currently pending exception in cx, if any.

Component Internals
in order to support something like an "are you sure you want to quit" dialog, the application needs to provide a higher-level event (e.g., startshutdown()) which allows for cancellation.

Packaging WebLock
// register the new ui with the mozilla chrome registry registerchrome(content, getfolder(cf,"weblock.xpi"),"weblock"); registerchrome(skin, getfolder(cf, "weblock.xpi"),"weblock"); // perform the installation if there are no errors if (err==success) performinstall(); else cancelinstall(err); the weblock trigger script the trigger script is the script placed on a web page that actually initiates an xpinstall installation and calls the installation script that appears in the xpi.

mozIStorageConnection
return value a mozistoragependingstatement object that can be used to cancel the statements' execution.

mozIStorageStatement
return value a mozistoragependingstatement object that can be used to cancel the execution of the statement.

mozIStorageStatementCallback
reason_canceled 1 the statement stopped executing because it was canceled.

nsIAutoCompleteInput
ontextreverted() called when the user cancels the autocomplete session.

nsICompositionStringSynthesizer
however, this must always return false since all dispatching dom events are not cancelable.

nsIDocShell
suspendrefreshuris() cancel the xpcom timers for each meta-refresh uri in this docshell, and this docshell's children, recursively.

nsIDroppedLinkHandler
exceptions thrown ns_error_dom_security_err error will be thrown and the event canceled if the receiving target should not load the uri for security reasons.

nsIFilePicker
constant value description returnok 0 the file picker dialog was closed by the user hitting 'ok' returncancel 1 the file picker dialog was closed by the user hitting 'cancel' returnreplace 2 the user chose an existing file and acknowledged that they want to overwrite the file filter constants these constants are used to create filters for commonly-used file types.

nsIFrameScriptLoader
this cancels the effect of the aallowdelayedload flag, meaning that the loader will no longer load the script into new frames.

nsIHttpChannelInternal
method overview void getrequestversion(out unsigned long major, out unsigned long minor); void getresponseversion(out unsigned long major, out unsigned long minor); void httpupgrade(in acstring aprotocolname, in nsihttpupgradelistener alistener); void setcookie(in string acookieheader); void setupfallbackchannel(in string afallbackkey); attributes attribute type description canceled boolean returns true if and only if the channel has been canceled.

nsIHttpHeaderVisitor
s.interfaces.nsirequest; }; myhttprequestobserver.prototype.observe = function ( subject, topic, data ) { var uri, avisitor; if ( subject instanceof this.nsihttpchannel ) { avisitor = new mynsihttpheadervisitor( ); subject.visitresponseheaders( avisitor ); if ( avisitor.isflash( ) ) { uri = subject.uri; subject.cancel( this.aborted ); alert( "found flash!" ); //handle flash file here } } }; myhttprequestobserver.prototype.register = function ( ) { var observerservice = components.classes[ "@mozilla.org/observer-service;1" ].getservice( components.interfaces.nsiobserverservice ); observerservice.addobserver(this, "http-on-examine-response", false); ...

nsIProcessScriptLoader
this cancels the effect of the aallowdelayedload flag, meaning that the loader will no longer load the script into new child processes.

nsIProgressEventSink
notifications will cease once the channel calls its listener's onstoprequest method or once the channel is canceled (via nsirequest.cancel()).

nsIRequestObserver
note: an exception thrown from onstartrequest has the side-effect of causing the request to be canceled.

nsISSLErrorListener
return value the consumer shall return true if it wants to suppress the error message related to the error (the connection will still get canceled).

nsIStreamListener
note: throwing an exception will cancel the request.

nsITaskbarProgress
this should be used when the operation is complete or canceled.

nsITextInputProcessorCallback
example of simple js-ime: var simpleime = { _hasfocus: false, _hasrightstocompose: false, _tip: null, _callback: function simpleime_callback(atip, anotification) { try { switch (anotification.type) { case "request-to-commit": atip.commitcomposition(); break; case "request-to-cancel": atip.cancelcomposition(); break; case "notify-focus": this._hasfocus = true; break; case "notify-blur": this._hasfocus = false; break; case "notify-detached": this._hasfocus = false; this._hasrightstocompose = false; break; } return true; } catch (e) { return f...

nsIUserCertPicker
inherits from: nsisupports last changed in gecko 1.7 method overview nsix509cert pickbyusage(in nsiinterfacerequestor ctx, in wstring selectednickname, in long certusage, in boolean allowinvalid, in boolean allowduplicatenicknames, out boolean canceled); methods pickbyusage() nsix509cert pickbyusage( in nsiinterfacerequestor ctx, in wstring selectednickname, in long certusage, in boolean allowinvalid, in boolean allowduplicatenicknames, out boolean canceled ); parameters ctx selectednickname certusage allowinvalid allowduplicatenicknames canceled return value ...

nsIXMLHttpRequestEventTarget
1.0 66 introduced gecko 1.9.1 inherits from: nsidomeventtarget last changed in gecko 5.0 (firefox 5.0 / thunderbird 5.0 / seamonkey 2.2) attributes attribute type description onabort nsidomeventlistener a javascript function object that gets invoked if the operation is canceled by the user.

XPCOM Interface Reference
ultnsiautocompletesearchnsibadcertlistener2nsibidikeyboardnsibinaryinputstreamnsibinaryoutputstreamnsiblocklistpromptnsiblocklistservicensiboxobjectnsibrowserboxobjectnsibrowserhistorynsibrowsersearchservicensicrlinfonsicrlmanagernsicachensicachedeviceinfonsicacheentrydescriptornsicacheentryinfonsicachelistenernsicachemetadatavisitornsicacheservicensicachesessionnsicachevisitornsicachingchannelnsicancelablensicategorymanagernsichannelnsichanneleventsinknsichannelpolicynsicharsetresolvernsichromeframemessagemanagernsichromeregistrynsiclassinfonsiclipboardnsiclipboardcommandsnsiclipboarddragdrophooklistnsiclipboarddragdrophooksnsiclipboardhelpernsiclipboardownernsicollectionnsicommandcontrollernsicommandlinensicommandlinehandlernsicommandlinerunnernsicomponentmanagernsicomponentregistrarnsicomposi...

XPCOM Interface Reference by grouping
nsicontentpolicy credentials nsilogininfo nsiloginmanager using nsiloginmanager nsiloginmanagerstorage nsiloginmetainfo history nsiglobalhistory nsiglobalhistory2 nsiglobalhistory3 ssl nsibadcertlistener2 system action nsicancelable application application nsiapplicationupdateservice nsiappshell nsiappshellservice nsiappstartup xul nsixulappinfo nsixulruntime nsixultemplatebuilder nsixultemplatequeryprocessor nsixultemplateresult ...

Storage
tset) { for (let row = aresultset.getnextrow(); row; row = aresultset.getnextrow()) { let value = row.getresultbyname("column_name"); } }, handleerror: function(aerror) { print("error: " + aerror.message); }, handlecompletion: function(areason) { if (areason != components.interfaces.mozistoragestatementcallback.reason_finished) print("query canceled or aborted!"); } }); the call to executeasync takes an object that implements mozistoragestatementcallback.

Xray vision
for example: window.confirm() is a dom api that's supposed to ask the user to confirm an action, and return a boolean depending on whether they clicked "ok" or "cancel".

WebIDL bindings
andler" macro: impl_event_handler(onthingchange); the "onthingchange" needs to be added to the staticatoms.py file: atom("onthingchange", "onthingchange") the actual implementation (.cpp) for firing the event would then look something like: nsresult myinterface::dispatchthingchangeevent() { ns_named_literal_string(type, "thingchange"); eventinit init; init.mbubbles = false; init.mcancelable = false; refptr<event> event = event::constructor(this, type, init); event->settrusted(true); errorresult rv; dispatchevent(*event, rv); return rv.stealnsresult(); // assuming the caller cares about the return code.

Constants - Plugins
npres_user_break 2 user canceled stream directly by clicking the stop button or indirectly by some action such as deleting the instance or initiating higher-priority network operations.

Initialization and Destruction - Plugins
the browser calls the plug-in's np_shutdown function, which informs the plug-in that its library is about to be unloaded, and gives it a chance to cancel any outstanding i/o requests, delete threads it created, free any memory it allocated, and perform any other closing tasks.

Streams - Plugins
npres_user_break: the user canceled the stream directly by clicking the stop button or indirectly by some action, such as by deleting the instance or initiating higher-priority network operations.

Accessibility Inspector - Firefox Developer Tools
note, however, that if you hold the shift key down when "performing a pick", you can "preview" the accessibility object in the tree (and its properties in the right-hand pane), but then continue picking as many times as you like (the picker does not get cancelled) until you release the shift key.

Network request details - Firefox Developer Tools
click send to send the modified request, or cancel to cancel editing.

Examine and edit HTML - Firefox Developer Tools
when you release the mouse button, the element will be inserted at the corresponding position: you can cancel the drag and drop by pressing the esc key.

Page inspector keyboard shortcuts - Firefox Developer Tools
command windows macos linux select the element under the mouse and cancel picker mode click click click select the element under the mouse and stay in picker mode shift+click shift+click shift+click html pane these shortcuts work while you're in the inspector's html pane.

Web console keyboard shortcuts - Firefox Developer Tools
+ e execute the current expression enter return enter add a new line, for entering multiline expressions shift + enter shift + return shift + enter autocomplete popup these shortcuts apply while the autocomplete popup is open: command windows macos linux choose the current autocomplete suggestion tab tab tab cancel the autocomplete popup esc esc esc move to the previous autocomplete suggestion up arrow up arrow up arrow move to the next autocomplete suggestion down arrow down arrow down arrow page up through autocomplete suggestions page up page up page up page down through autocomplete suggestions page down page down page down...

AbortSignal: abort event - Web APIs
bubbles no cancelable no interface event event handler onabort examples in the following snippets, we create a new abortcontroller object, and get its abortsignal (available in the signal property).

Animation.ready - Web APIs
a new promise is created every time the animation enters the "pending" play state as well as when the animation is canceled, since in both of those scenarios, the animation is ready to be started again.

AnimationPlaybackEvent.AnimationPlaybackEvent() - Web APIs
cancelable optional defaults to false, of type boolean, indicating if the event can be canceled or not.

AudioContext.getOutputTimestamp() - Web APIs
play.addeventlistener('click', () => { if(!audioctx) { audioctx = new window.audiocontext(); } getdata(); source.start(0); play.setattribute('disabled', 'disabled'); raf = requestanimationframe(outputtimestamps); }); stop.addeventlistener('click', () => { source.stop(0); play.removeattribute('disabled'); cancelanimationframe(raf); }); // function to output timestamps function outputtimestamps() { let ts = audioctx.getoutputtimestamp() console.log('context time: ' + ts.contexttime + ' | performance time: ' + ts.performancetime); raf = requestanimationframe(outputtimestamps); } specifications specification status comment web audio apithe definition of 'getoutputtimestamp(...

AudioProcessingEvent - Web APIs
cancelable read only boolean is it possible to cancel the event?

AudioScheduledSourceNode: ended event - Web APIs
bubbles no cancelable no interface event event handler property audioscheduledsourcenode.onended usage notes this event occurs when a audioscheduledsourcenode has stopped playing, either because it's reached a predetermined stop time, the full duration of the audio has been performed, or because the entire buffer has been played.

AudioTrackList: addtrack event - Web APIs
bubbles no cancelable no interface trackevent event handler property onaddtrack examples using addeventlistener(): const videoelement = document.queryselector('video'); videoelement.audiotracks.addeventlistener('addtrack', (event) => { console.log(`audio track: ${event.track.label} added`); }); using the onaddtrack event handler property: const videoelement = document.queryselector('video'); videoelement.audiotracks.onaddtrack = (event) => { console.log(`audio track: ${event.track.label} added`); }; specifications specification status html living standardthe definition of 'addtrack' in that specification.

AudioTrackList: change event - Web APIs
bubbles no cancelable no interface event event handler property onchange examples using addeventlistener(): const videoelement = document.queryselector('video'); videoelement.audiotracks.addeventlistener('change', (event) => { console.log(`'${event.type}' event fired`); }); // changing the value of `enabled` will trigger the `change` event const toggletrackbutton = document.queryselector('.toggle-track'); toggletrackbutton.addeventlistener('click', () => { const track = videoelement.audiotracks[0]; track.enabled = !track.enabled; }); using the onchange event handler property: const videoelement = documen...

AudioTrackList: removetrack event - Web APIs
bubbles no cancelable no interface trackevent event handler property onremovetrack examples using addeventlistener(): const videoelement = document.queryselector('video'); videoelement.audiotracks.addeventlistener('removetrack', (event) => { console.log(`audio track: ${event.track.label} removed`); }); using the onremovetrack event handler property: const videoelement = document.queryselector('video'); videoelement.audiotracks.onremovetrack = (event) => { console.log(`audio track: ${event.track.label} removed`); }; specifications specification status html living standardthe definition of 'removetrack' in that specification.

BeforeUnloadEvent - Web APIs
arget="_top"><rect x="116" y="1" width="170" height="50" fill="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="201" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">beforeunloadevent</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} bubbles no cancelable yes target objects defaultview interface event examples window.addeventlistener("beforeunload", function( event ) { event.returnvalue = "\o/"; }); // is equivalent to window.addeventlistener("beforeunload", function( event ) { event.preventdefault(); }); webkit-derived browsers don't follow the spec for the dialog box.

BroadcastChannel: message event - Web APIs
bubbles no cancelable no interface messageevent event handler property onmessage examples live example in this example there's a "sender" <iframe> that broadcasts the contents of a <textarea> when the user clicks a button.

BroadcastChannel: messageerror event - Web APIs
bubbles no cancelable no interface messageevent event handler property onmessageerror examples this code uses addeventlistener to listen for messages and errors: const channel = new broadcastchannel('example-channel'); channel.addeventlistener('message', (event) => { received.textcontent = event.data; }); channel.addeventlistener('messageerror', (event) => { console.error(event); }); the same, but using the onmessage and onmessageerror event handler properties: const channel = new broadcastchannel('example-channel'); channel.onmessage = (event) => { received.textcontent = event.data; }; channel.onmess...

ByteLengthQueuingStrategy.ByteLengthQueuingStrategy() - Web APIs
}, cancel(err) { console.log("stream error:", err); } }, queuingstrategy); var size = queuingstrategy.size(chunk); specifications specification status comment streamsthe definition of 'bytelengthqueuingstrategy()' in that specification.

ByteLengthQueuingStrategy.size() - Web APIs
}, cancel(err) { console.log("stream error:", err); } }, queuingstrategy); var size = queueingstrategy.size(chunk); specifications specification status comment streamsthe definition of 'size' in that specification.

ByteLengthQueuingStrategy - Web APIs
}, cancel(err) { console.log("stream error:", err); } }, queueingstrategy); var size = queueingstrategy.size(chunk); specifications specification status comment streamsthe definition of 'bytelengthqueuingstrategy' in that specification.

Constraint validation API - Web APIs
for this to happen, the custom validity has to be cancelled, by invoking setcustomvalidity() with an empty string value.

DataTransfer.clearData() - Web APIs
event.datatransfer.cleardata(); // set the drag's format and data (use event target's id for data) event.datatransfer.setdata('text/plain', event.target.id); data.innerhtml = event.datatransfer.getdata('text/plain'); } function dragendhandler (event) { if (!dropped) { status.innerhtml = 'drag canceled'; } data.innerhtml = event.datatransfer.getdata('text/plain') || 'empty'; // change border to signify drag is no longer in process event.currenttarget.style.border = '1px solid black'; if (dropped) { // remove all event listeners draggable.removeeventlistener('dragstart', dragstarthandler); draggable.removeeventlistener('dragend', dragendhandler); ...

DedicatedWorkerGlobalScope: message event - Web APIs
bubbles no cancelable no interface messageevent event handler property onmessage examples this code creates a new worker and sends it a message using worker.postmessage(): const worker = new worker("static/scripts/worker.js"); worker.addeventlistener('message', (event) => { console.log(`received message from worker: ${event.data}`) }); the worker can listen for this message using addeventlistener(): // inside static/scripts/worker.js self.addeventlistener('message', (event) => { console.log(`received message from parent: ${event.data}`); }); ...

DedicatedWorkerGlobalScope: messageerror event - Web APIs
bubbles no cancelable no interface messageevent event handler property onmessageerror examples listen for messageerror using addeventlistener(): // inside worker.js self.addeventlistener('messageerror', (event) => { self.postmessage('error receiving message'); console.error(event); }); the same, but using the onmessageerror event handler property: // inside worker.js self.onmessageerror = (event) => { self.postmessage('error receiving message'); console.error(event); }; specifications specification status html living standard living standard ...

Document: DOMContentLoaded event - Web APIs
bubbles yes cancelable yes (although specified as a simple event that isn't cancelable) interface event event handler property none a different event, load, should be used only to detect a fully-loaded page.

Document: animationend event - Web APIs
bubbles yes cancelable no interface animationevent event handler property onanimationend the original target for this event is the element that had the animation applied.

Document: animationiteration event - Web APIs
bubbles yes cancelable no interface animationevent event handler property onanimationiteration the original target for this event is the element that had the animation applied.

Document: animationstart event - Web APIs
bubbles yes cancelable no interface animationevent event handler property onanimationstart the original target for this event is the element that had the animation applied.

Document: copy event - Web APIs
bubbles yes cancelable yes interface clipboardevent event handler property oncopy the original target for this event is the element that was the intended target of the copy action.

Document: cut event - Web APIs
bubbles yes cancelable yes interface clipboardevent event handler property oncut the original target for this event is the element that was the intended target of the cut action.

Document: drag event - Web APIs
bubbles yes cancelable yes default action continue the drag & drop operation.

Document: dragend event - Web APIs
bubbles yes cancelable no default action varies interface dragevent event handler property ondragend examples see the drag event for example code or this jsfiddle demo.

Document: dragenter event - Web APIs
bubbles yes cancelable yes default action reject immediate user selection as potential target element.

Document: dragexit event - Web APIs
bubbles yes cancelable no default action none.

Document: dragleave event - Web APIs
bubbles yes cancelable no default action none.

Document: dragover event - Web APIs
bubbles yes cancelable yes default action reset the current drag operation to "none".

Document: dragstart event - Web APIs
bubbles yes cancelable yes default action initiate the drag-and-drop operation.

Document: drop event - Web APIs
bubbles yes cancelable yes default action varies interface dragevent event handler property ondrop examples see the drag event for example code or this jsfiddle demo.

Document: fullscreenchange event - Web APIs
bubbles yes cancelable no interface event event handler property onfullscreenchange the event is sent to the element that is transitioning into or out of full-screen mode, and this event then bubbles up to the document.

Document: fullscreenerror event - Web APIs
bubbles yes cancelable no interface event event handler property onfullscreenerror as with the fullscreenchange event, two fullscreenerror events are fired; the first is sent to the element which failed to change modes, and the second is sent to the document which owns that element.

Document: gotpointercapture event - Web APIs
bubbles no cancelable no interface pointerevent event handler property ongotpointercapture examples this example gets a <p> element and listens for the gotpointercapture event.

Document: keydown event - Web APIs
bubbles yes cancelable yes interface keyboardevent event handler property onkeydown the keydown and keyup events provide a code indicating which key is pressed, while keypress indicates which character was entered.

Document: keypress event - Web APIs
interface keyboardevent bubbles yes cancelable yes default action varies: keypress event; launch text composition system; blur and focus events; domactivate event; other event examples addeventlistener keypress example this example logs the keyboardevent.code value whenever you press a key.

Document: keyup event - Web APIs
bubbles yes cancelable yes interface keyboardevent event handler property onkeyup the keydown and keyup events provide a code indicating which key is pressed, while keypress indicates which character was entered.

Document: lostpointercapture event - Web APIs
bubbles no cancelable no interface pointerevent event handler property onlostpointercapture examples this example listens for the lostpointercapture event, and captures the pointer for an element on pointerdown.

Document.ononline - Web APIs
both events are non-cancellable (you can't prevent the user from coming online, or going offline).

Document: paste event - Web APIs
bubbles yes cancelable yes interface clipboardevent event handler property onpaste the original target for this event is the element that was the intended target of the paste action.

Document: pointerdown event - Web APIs
bubbles yes cancelable yes interface pointerevent event handler property onpointerdown examples using addeventlistener(): document.addeventlistener('pointerdown', (event) => { console.log('pointer down event'); }); using the onpointerdown event handler property: document.onpointerdown = (event) => { console.log('pointer down event'); }; specifications specification status pointer event...

Document: pointerenter event - Web APIs
bubbles no cancelable no interface pointerevent event handler property onpointerenter examples using addeventlistener(): document.addeventlistener('pointerenter', (event) => { console.log('pointer entered element'); }); using the onpointerenter event handler property: document.onpointerenter = (event) => { console.log('pointer entered element'); }; specifications specification status pointer events obsolete ...

Document: pointerleave event - Web APIs
bubbles no cancelable no interface pointerevent event handler property onpointerleave examples using addeventlistener(): document.addeventlistener('pointerleave', (event) => { console.log('pointer left element'); }); using the onpointerleave event handler property: document.onpointerleave = (event) => { console.log('pointer left element'); }; specifications specification status pointer events obsolete ...

Document: pointerlockchange event - Web APIs
bubbles yes cancelable no interface event event handler property onpointerlockchange examples using addeventlistener(): document.addeventlistener('pointerlockchange', (event) => { console.log('pointer lock changed'); }); using the onpointerlockchange event handler property: document.onpointerlockchange = (event) => { console.log('pointer lock changed'); }; specifications specification status pointer lock candidate recommendation ...

Document: pointerlockerror event - Web APIs
bubbles yes cancelable no interface event event handler property onpointerlockerror examples using addeventlistener(): const para = document.queryselector('p'); document.addeventlistener('pointerlockerror', (event) => { console.log('error locking pointer'); }); using the onpointerlockerror event handler property: document.onpointerlockerror = (event) => { console.log('error locking pointer'); }; specifications specification status pointer lock candidate recommendation ...

Document: pointerover event - Web APIs
bubbles yes cancelable yes interface pointerevent event handler property onpointerover examples using addeventlistener(): document.addeventlistener('pointerover', (event) => { console.log('pointer moved in'); }); using the onpointerover event handler property: document.onpointerover = (event) => { console.log('pointer moved in'); }; specifications specification status pointer events obsolete ...

Document: pointerup event - Web APIs
bubbles yes cancelable yes interface pointerevent event handler property onpointerup examples using addeventlistener(): document.addeventlistener('pointerup', (event) => { console.log('pointer up'); }); using the onpointerup event handler property: document.onpointerup = (event) => { console.log('pointer up'); }; specifications specification status pointer events obsolete ...

Document: readystatechange event - Web APIs
bubbles no cancelable no interface event event handler property onreadystatechange examples live example html <div class="controls"> <button id="reload" type="button">reload</button> </div> <div class="event-log"> <label>event log:</label> <textarea readonly class="event-log-contents" rows="8" cols="30"></textarea> </div> css body { display: grid; grid-template-areas: "control log"; } .controls { grid-area: control; display: flex; align-items: center; justify-content: center; } .event-log { grid-area: log; } .event-log-contents { resize: none; } label, button { display: block; } #reload { height: 2rem; } j...

Document: scroll event - Web APIs
bubbles yes cancelable no interface event event handler property onscroll note: in ios uiwebviews, scroll events are not fired while scrolling is taking place; they are only fired after the scrolling has completed.

Document: selectionchange event - Web APIs
bubbles no cancelable no interface event event handler property onselectionchange examples // addeventlistener version document.addeventlistener('selectionchange', () => { console.log(document.getselection()); }); // onselectionchange version document.onselectionchange = () => { console.log(document.getselection()); }; specifications specification status comment selection apithe definition of 'selectionchange' in that specification.

Document: touchend event - Web APIs
bubbles yes cancelable yes interface touchevent event handler property ontouchend examples code samples for those events are available on the dedicated page: touch events.

Document: touchmove event - Web APIs
bubbles yes cancelable yes interface touchevent event handler property ontouchmove examples code samples for those events are available on the dedicated page: touch events.

Document: touchstart event - Web APIs
bubbles yes cancelable yes interface touchevent event handler property ontouchstart examples code samples for those events are available on the dedicated page: touch events.

Document: transitionrun event - Web APIs
bubbles yes cancelable no interface transitionevent event handler property ontransitionrun the original target for this event is the element that had the transition applied.

Document: transitionstart event - Web APIs
bubbles yes cancelable no interface transitionevent event handler property globaleventhandlers.ontransitionstart the original target for this event is the element that had the transition applied.

Document: visibilitychange event - Web APIs
bubbles yes cancelable no interface event event handler property onvisibilitychange usage notes the event doesn't include the document's updated visibility status, but you can get that information from the document's visibilitystate property.

Document: wheel event - Web APIs
bubbles yes cancelable yes interface wheelevent event handler property globaleventhandlers.onwheel this event replaces the non-standard deprecated mousewheel event.

Element: DOMActivate event - Web APIs
bubbles yes cancelable yes interface mouseevent examples <svg xmlns="http://www.w3.org/2000/svg" version="1.2" baseprofile="tiny" xmlns:ev="http://www.w3.org/2001/xml-events" width="6cm" height="5cm" viewbox="0 0 600 500"> <desc>example: invoke an ecmascript function from a domactivate event</desc> <!-- ecmascript to change the radius --> <script type="application/ecmascript"><![cdata[ function change(evt) { var circle = evt.target; var currentradius = circle.getfloattrait("r"); if (currentradius == 100) circle.setfloattrait("r", currentradius * 2)...

Element: DOMMouseScroll event - Web APIs
bubbles yes cancelable yes interface mousescrollevent if you want to prevent the default action of mouse wheel events, it's not enough to handle only this event on gecko because if scroll amount by a native mouse wheel event is less than 1 line (or less than 1 page when the system setting is by page scroll), other mouse wheel events may be fired without this event.

Element: MSGestureChange event - Web APIs
bubbles unknown cancelable unknown interface msgestureevent event handler property unknown specifications not part of any specification.

Element: MSGestureEnd event - Web APIs
bubbles unknown cancelable unknown interface msgestureevent event handler property unknown specifications not part of any specification.

Element: MSGestureStart event - Web APIs
bubbles unknown cancelable unknown interface msgestureevent event handler property unknown specifications not part of any specification.

Element: MSGestureTap event - Web APIs
bubbles unknown cancelable unknown interface msgestureevent event handler property unknown specifications not part of any specification.

Element: MSInertiaStart event - Web APIs
bubbles unknown cancelable unknown interface msgestureevent event handler property unknown specifications not part of any specification.

Element: MSManipulationStateChanged event - Web APIs
bubbles unknown cancelable unknown interface msmanipulationevent event handler property unknown get manipulation states using the laststate and currentstate properties.

Element: MozMousePixelScroll event - Web APIs
bubbles yes cancelable yes interface mousescrollevent getting the distance scrolled the event's detail property indicates the scroll distance in terms of lines, with negative values indicating the scrolling movement is either toward the bottom or toward the right, and positive values indicating scrolling to the top or left.

Element: afterscriptexecute event - Web APIs
bubbles yes cancelable no interface event event handler property none specifications not part of any specification.

Element: auxclick event - Web APIs
bubbles yes cancelable yes interface mouseevent event handler property onauxclick preventing default actions for the vast majority of browsers that map middle click to opening a link in a new tab, including firefox, it is possible to cancel this behavior by calling preventdefault() from within an auxclick event handler.

Element: blur event - Web APIs
bubbles no cancelable no interface focusevent event handler property onblur sync / async sync composed yes examples simple example html <form id="form"> <input type="text" placeholder="text input"> <input type="password" placeholder="password"> </form> javascript const password = document.queryselector('input[type="password"]'); password.addeventlistener('focus', (event) => { event.target.style.background = 'pink'; }); password.addeventlistener('blur', (event) => { event.target.style.background = ''; }); result event ...

Element: click event - Web APIs
bubbles yes cancelable yes interface mouseevent event handler property onclick if the button is pressed on one element and the pointer is moved outside the element before the button is released, the event is fired on the most specific ancestor element that contained both elements.

Element: compositionstart event - Web APIs
bubbles yes cancelable yes interface compositionevent event handler property none examples const inputelement = document.queryselector('input[type="text"]'); inputelement.addeventlistener('compositionstart', (event) => { console.log(`generated characters were: ${event.data}`); }); live example html <div class="control"> <label for="name">on macos, click in the textbox below,<br> then type <kbd>option</kbd> + <kbd>`</kbd>, then <kbd>a</kbd>:</label> <input type="text" id="example" name="exampl...

Element: compositionupdate event - Web APIs
bubbles yes cancelable yes interface compositionevent event handler property none examples const inputelement = document.queryselector('input[type="text"]'); inputelement.addeventlistener('compositionupdate', (event) => { console.log(`generated characters were: ${event.data}`); }); live example html <div class="control"> <label for="name">on macos, click in the textbox below,<br> then type <kbd>option</kbd> + <kbd>`</kbd>, then <kbd>a</kbd>:</label>...

Element: contextmenu event - Web APIs
bubbles yes cancelable yes interface mouseevent event handler property oncontextmenu examples in this example, the default action of the contextmenu event is canceled using preventdefault() when the contextmenu event is fired at the first paragraph.

Element: dblclick event - Web APIs
bubbles yes cancelable yes interface mouseevent event handler property ondblclick examples this example toggles the size of a card when you double click on it.

Element: error event - Web APIs
bubbles no cancelable no interface event or uievent event handler property onerror the event object is a uievent instance if it was generated from a user interface element, or an event instance otherwise.

Element: focus event - Web APIs
bubbles no cancelable no interface focusevent event handler property onfocus sync / async sync composed yes examples simple example html <form id="form"> <input type="text" placeholder="text input"> <input type="password" placeholder="password"> </form> javascript const password = document.queryselector('input[type="password"]'); password.addeventlistener('focus', (event) => { event.target.style.background = 'pink'; }); password.addeventlistener('blur', (event) => { event.target.style.background = ''; }); result e...

Element: focusin event - Web APIs
bubbles yes cancelable no interface focusevent event handler property onfocusin sync / async sync composed yes examples live example html <form id="form"> <input type="text" placeholder="text input"> <input type="password" placeholder="password"> </form> javascript const form = document.getelementbyid('form'); form.addeventlistener('focusin', (event) => { event.target.style.background = 'pink'; }); form.addeventlistener('focusout', (event) => { event.target.style.background = ''; }); result specificat...

Element: focusout event - Web APIs
bubbles yes cancelable no interface focusevent event handler property onfocusout sync / async sync composed yes examples live example html <form id="form"> <input type="text" placeholder="text input"> <input type="password" placeholder="password"> </form> javascript const form = document.getelementbyid('form'); form.addeventlistener('focusin', (event) => { event.target.style.background = 'pink'; }); form.addeventlistener('focusout', (event) => { event.target.style.background = ''; }); result specificatio...

Element: fullscreenerror event - Web APIs
bubbles yes cancelable no interface event event handler property onfullscreenerror as with the fullscreenchange event, two fullscreenerror events are fired; the first is sent to the element which failed to change modes, and the second is sent to the document which contains that element.

Element: gesturechange event - Web APIs
bubbles unknown cancelable unknown interface gestureevent event handler property unknown specifications not part of any specification.

Element: gestureend event - Web APIs
bubbles unknown cancelable unknown interface gestureevent event handler property unknown specifications not part of any specification.

Element: gesturestart event - Web APIs
bubbles unknown cancelable unknown interface gestureevent event handler property unknown specifications not part of any specification.

Element: keydown event - Web APIs
bubbles yes cancelable yes interface keyboardevent event handler property onkeydown the keydown and keyup events provide a code indicating which key is pressed, while keypress indicates which character was entered.

Element: keypress event - Web APIs
interface keyboardevent bubbles yes cancelable yes default action varies: keypress event; launch text composition system; blur and focus events; domactivate event; other event examples addeventlistener keypress example this example logs the keyboardevent.code value whenever you press a key after focussing the <input> element.

Element: keyup event - Web APIs
bubbles yes cancelable yes interface keyboardevent event handler property onkeyup the keydown and keyup events provide a code indicating which key is pressed, while keypress indicates which character was entered.

Element: mousedown event - Web APIs
bubbles yes cancelable yes interface mouseevent event handler property onmousedown examples the following example uses the mousedown, mousemove, and mouseup events to allow the user to draw on an html5 canvas.

Element: mousemove event - Web APIs
bubbles yes cancelable yes interface mouseevent event handler property onmousemove examples the following example uses the mousedown, mousemove, and mouseup events to allow the user to draw on an html5 canvas.

Element: mouseout event - Web APIs
bubbles yes cancelable yes interface mouseevent event handler property onmouseout examples the following examples show the use of the mouseout event.

Element: mouseover event - Web APIs
bubbles yes cancelable yes interface mouseevent event handler property onmouseover examples the following example illustrates the difference between mouseover and mouseenter events.

Element: mouseup event - Web APIs
bubbles yes cancelable yes interface mouseevent event handler property onmouseup examples the following example uses the mousedown, mousemove, and mouseup events to allow the user to draw on an html5 canvas.

Element: mousewheel event - Web APIs
bubbles yes cancelable yes interface mousewheelevent event handler property onmousewheel the detail property the value of the detail property is always zero, except in opera, which uses detail similarly to the firefox-only dommousescroll event's detail value, which indicates the scroll distance in terms of lines, with negative values indicating the scrolling movement is either t...

Element: msContentZoom event - Web APIs
bubbles unknown cancelable unknown interface unknown event handler property unknown example contentzoom.addeventlistener("mscontentzoom", function(e) { zoomfactor.value = contentzoom.mscontentzoomfactor.tofixed(2); }); specifications not part of any specification.

Element: overflow event - Web APIs
bubbles yes cancelable yes interface uievent event handler property unknown examples <div id="wrapper"> <div id="child"></div> </div> <br/> <label><input type="checkbox" id="toggle" checked/> overflow</label> <style> #wrapper { width: 20px; height: 20px; background: #000; padding: 5px; overflow: hidden; } #child { width: 40px; height: 40px; border: 2px solid grey; background: #ccc; } </style> <script> var wrapper = document.getelementbyid("w...

Element: scroll event - Web APIs
bubbles no cancelable no interface event event handler property onscroll note: in ios uiwebviews, scroll events are not fired while scrolling is taking place; they are only fired after the scrolling has completed.

Element: select event - Web APIs
bubbles yes cancelable no interface uievent if generated from a user interface, event otherwise event handler property onselect the event is not available for all elements in all languages.

Element: show event - Web APIs
bubbles no cancelable no interface event event handler property onshow examples <div contextmenu="test"></div> <menu type="context" id="test"> <menuitem label="alert" onclick="alert('the alert label has been clicked')" /> </menu> <script> document.getelementbyid("test").addeventlistener("show", function(e){ alert("the context menu will be displayed"); }, false); </script> specifications specification status html5the definition of 'show event' in that specification.

Element: touchend event - Web APIs
bubbles yes cancelable yes interface touchevent event handler property ontouchend examples code samples for those events are available on the dedicated page: touch events.

Element: touchmove event - Web APIs
bubbles yes cancelable yes interface touchevent event handler property ontouchmove examples code samples for those events are available on the dedicated page: touch events.

Element: touchstart event - Web APIs
bubbles yes cancelable yes interface touchevent event handler property ontouchstart examples code samples for those events are available on the dedicated page: touch events.

Element: underflow event - Web APIs
bubbles yes cancelable yes interface uievent event handler property unknown examples <div id="wrapper"> <div id="child"></div> </div> <br/> <label><input type="checkbox" id="toggle" checked/> overflow</label> <style> #wrapper { width: 20px; height: 20px; background: #000; padding: 5px; overflow: hidden; } #child { width: 40px; height: 40px; border: 2px solid grey; background: #ccc; } </style> <script> var wrapper = document.ge...

Element: webkitmouseforcechanged event - Web APIs
bubbles unknown cancelable unknown interface mouseevent webkitmouseforcechanged is a proprietary, webkit-specific event introduced by apple to support their force touch events feature.

Element: webkitmouseforcedown event - Web APIs
bubbles unknown cancelable unknown interface mouseevent webkitmouseforcedown is a proprietary, webkit-specific event.

Element: webkitmouseforceup event - Web APIs
bubbles unknown cancelable unknown interface mouseevent webkitmouseforceup is a proprietary, webkit-specific event.

Element: webkitmouseforcewillbegin event - Web APIs
bubbles unknown cancelable unknown interface mouseevent webkitmouseforcewillbegin is a proprietary, webkit-specific event.

Element: wheel event - Web APIs
bubbles yes cancelable yes interface wheelevent event handler property onwheel note: don't confuse the wheel event with the scroll event.

Event.defaultPrevented - Web APIs
the defaultprevented read-only property of the event interface returns a boolean indicating whether or not the call to event.preventdefault() canceled the event.

Event.returnValue - Web APIs
syntax event.returnvalue = bool; var bool = event.returnvalue; value a boolean value which is true if the event has not been canceled; otherwise, if the event has been canceled or the default has been prevented, the value is false.

EventSource: error event - Web APIs
bubbles no cancelable no interface event or errorevent event handler property eventsource.onerror examples var evtsource = new eventsource('sse.php'); // addeventlistener version evtsource.addeventlistener('error', (e) => { console.log("an error occurred while attempting to connect."); }); // onerror version evtsource.onerror = (e) => { console.log("an error occurred while attempting to connect."); }; specifications specification status html living standardthe definition of 'error event' in that specification.

EventSource: message event - Web APIs
bubbles no cancelable no interface messageevent event handler property eventsource.onmessage examples in this basic example, an eventsource is created to receive events from the server; a page with the name sse.php is responsible for generating the events.

EventSource: open event - Web APIs
bubbles no cancelable no interface event event handler property eventsource.onopen examples var evtsource = new eventsource('sse.php'); // addeventlistener version evtsource.addeventlistener('open', (e) => { console.log("the connection has been established."); }); // onopen version evtsource.onopen = (e) => { console.log("the connection has been established."); }; specifications specification status html living standardthe definition of 'open event' in that specification.

FileReader: abort event - Web APIs
bubbles no cancelable no interface progressevent event handler property filereader.onabort examples live example html <div class="example"> <div class="file-select"> <label for="avatar">choose a profile picture:</label> <input type="file" id="avatar" name="avatar" accept="image/png, image/jpeg"> </div> <img src="" class="preview" height="200" alt="image preview..."> <div class="event-log"> <label>event log:</label> <textarea readonly class="event-log-contents"></textarea> </div> </div> css img.preview { margin: 1rem 0; } .event-log...

FileReader: error event - Web APIs
bubbles no cancelable no interface progressevent event handler property filereader.onerror examples const fileinput = document.queryselector('input[type="file"]'); const reader = new filereader(); function handleselected(e) { const selectedfile = fileinput.files[0]; if (selectedfile) { reader.addeventlistener('error', () => { console.error(`error occurred reading file: ${selectedfile.name}`); }); reader.addeventlistener('load', () => { console.error(`file: ${selectedfile.name} read successfully`); }); reader.readasdataurl(selectedfile); ...

FileReader: load event - Web APIs
bubbles no cancelable no interface progressevent event handler property filereader.onload examples live example html <div class="example"> <div class="file-select"> <label for="avatar">choose a profile picture:</label> <input type="file" id="avatar" name="avatar" accept="image/png, image/jpeg"> </div> <img src="" class="preview" height="200" alt="image preview..."> <div class="event-log"> <label>event log:</label> <textarea readonly class="event-log-contents"></textarea> </div> </div> css img.preview { margin: 1rem 0; } .event-log-contents { width: 18rem; height: 5rem; border...

FileReader: loadend event - Web APIs
bubbles no cancelable no interface progressevent event handler property filereader.onloadend examples live example html <div class="example"> <div class="file-select"> <label for="avatar">choose a profile picture:</label> <input type="file" id="avatar" name="avatar" accept="image/png, image/jpeg"> </div> <img src="" class="preview" height="200" alt="image preview..."> <div class="event-log"> <label>event log:</label> <textarea readonly class="event-log-contents"></textarea> </div> </div> css img.preview { margin: 1rem 0; } .event-log-contents { width: 18rem; hei...

FileReader: loadstart event - Web APIs
bubbles no cancelable no interface progressevent event handler property filereader.onloadstart examples live example html <div class="example"> <div class="file-select"> <label for="avatar">choose a profile picture:</label> <input type="file" id="avatar" name="avatar" accept="image/png, image/jpeg"> </div> <img src="" class="preview" height="200" alt="image preview..."> <div class="event-log"> <label>event log:</label> <textarea readonly class="event-log-contents"></textarea> </div> </div> css img.preview { margin: 1rem 0; } .event-log-contents { width: 18rem; height: 5rem; ...

FileReader: progress event - Web APIs
bubbles no cancelable no interface progressevent event handler property filereader.onprogress examples live example html <div class="example"> <div class="file-select"> <label for="avatar">choose a profile picture:</label> <input type="file" id="avatar" name="avatar" accept="image/png, image/jpeg"> </div> <img src="" class="preview" height="200" alt="image preview..."> <div class="event-log"> <label>event log:</label> <textarea readonly class="event-log-contents"></textarea> </div> </div> css img.preview { margin: 1rem 0; } .event-log-contents { width: 18rem; height: 5re...

FileReader.readyState - Web APIs
this could mean that: the entire file or blob has been read into memory, a file read error occurred, or abort() was called and the read was cancelled.