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TextTrack - Web APIs
the
texttrack interface—part of the api for handling webvtt (text tracks on media presentations)—describes and controls the text track associated with a particular <track> element.
...
texttrack.activecues read only a
texttrackcuelist object listing the currently active set of text track cues.
...
texttrack.cues read only a
texttrackcuelist which contains all of the track's cues.
...And 11 more matches
TextTrackCue - Web APIs
texttrackcue is an abstract class which is used as the basis for the various derived cue types, such as vttcue; you will instead work with those derived types.
... these cues represent a string of text that is presented for some duration of time during the performance of a
texttrack.
...
texttrackcue.track read only the
texttrack that this cue belongs to, or null if it doesn't belong to any.
...And 8 more matches
HTMLMediaElement.textTracks - Web APIs
the read-only
texttracks property on htmlmediaelement objects returns a
texttracklist object listing all of the
texttrack objects representing the media element's text tracks, in the same order as in the list of text tracks.
... see event handlers in
texttracklist to learn more about watching for changes to a media element's track list.
... syntax var
texttracks = mediaelement.
texttracks; value a
texttracklist object representing the list of text tracks included in the media element.
...And 6 more matches
TextTrackList - Web APIs
the
texttracklist interface is used to represent a list of the text tracks defined by the <track> element, with each track represented by a separate
texttrack object in the list.
... retrieve an instance of this object with htmlmediaelement.
texttracks.
... gettrackbyid() returns the
texttrack found within the
texttracklist whose id matches the specified string.
...And 4 more matches
TextTrackList.length - Web APIs
the read-only
texttracklist property length returns the number of entries in the
texttracklist, each of which is a
texttrack representing one track in the media element.
... syntax var trackcount =
texttracklist.length; value a number indicating how many text tracks are included in the
texttracklist.
... each track can be accessed by treating the
texttracklist as an array of objects of type
texttrack.
...And 2 more matches
TextTrackList.onremovetrack - Web APIs
the
texttracklist onremovetrack event handler is called when the removetrack event occurs, indicating that a text track has been removed from the media element, and therefore also from the
texttracklist.
... the event is passed into the event handler in the form of a trackevent object, whose track property identifies the track that was removed from the media element's
texttracklist.
... syntax
texttracklist.onremovetrack = eventhandler; value set onremovetrack to a function that accepts as input a trackevent object which indicates in its track property which text track has been removed from the media element.
...And 2 more matches
TextTrack: cuechange event - Web APIs
the cuechange event fires when a
texttrack has changed the currently displaying cues.
... the event is fired at both the
texttrack and at the htmltrackelement in which it's being presented, if any.
... bubbles no cancelable no interface event event handler property globaleventhandlers.oncuechange examples on the
texttrack you can set up a listener for the cuechange event on a
texttrack using the addeventlistener() method: track.addeventlistener('cuechange', function () { let cues = track.activecues; // array of current cues }); or you can just set the oncuechange event handler property: track.oncuechange = function () { let cues = track.activecues; // array of current cues } on the track element the underlying
texttrack, indicated by the track property, receives a cuechange event every time the currently-presented cue is changed.
... let
texttrackelem = document.getelementbyid("
texttrack");
texttrackelem.addeventlistener("cuechange", (event) => { let cues = event.target.track.activecues; }); in addition, you can use the oncuechange event handler: let
texttrackelem = document.getelementbyid("
texttrack");
texttrackelem.oncuechange = (event) => { let cues = event.target.track.activecues; }); specifications specification status html living standardthe definition of 'cuechange' in that specification.
TextTrack.mode - Web APIs
the
texttrack interface's mode property is a string specifying and controlling the text track's mode: disabled, hidden, or showing.
... syntax var mode =
texttrack.mode;
texttrack.mode = "disabled" | "hidden" | "showing"; value a domstring which indicates the track's current mode.
... text track mode constants the text track mode—sometimes identified using the idl enum
texttrackmode—must be one of the following values: disabled the text track is currently disabled.
...if the user agent hasn't tried to obtain the track's cues yet, it will do so soon (thereby populating the track's
texttrack.cues property).
TextTrackList.onaddtrack - Web APIs
the
texttracklist property onaddtrack is an event handler which is called when the addtrack event occurs, indicating that a new text track has been added to the media element whose text tracks the
texttracklist represents.
... syntax
texttracklist.onaddtrack = eventhandler; value set onaddtrack to a function that accepts as input a trackevent object which indicates in its track property which video track has been added to the media.
... usage notes the addtrack event is called whenever a new track is added to the media element whose video tracks are represented by the
texttracklist object.
... document.queryselector("video").
texttracks.onaddtrack = function(event) { addtotracklist(event.track); }; specifications specification status comment html living standardthe definition of '
texttracklist: onaddtrack' in that specification.
TextTrackList.onchange - Web APIs
the
texttracklist property onchange is an event handler which is called when the change event occurs, indicating that a change has occurred on a
texttrack in the videotracklist.
... syntax
texttracklist.onchange = eventhandler; example this snippet establishes a handler for the change event that looks at each of the tracks in the list, calling a function to update the state of a user interface control that indicates the current state of the track.
... var tracklist = document.queryselector("video, audio").
texttracks; tracklist.onchange = function(event) { ....
... /* do something */ }; specifications specification status comment html living standardthe definition of '
texttracklist: onchange' in that specification.
SourceBuffer.textTracks - Web APIs
the
texttracks read-only property of the sourcebuffer interface returns a list of the text tracks currently contained inside the sourcebuffer.
... syntax var my
texttracks = sourcebuffer.
texttracks; value an
texttracklist object.
... example tbd specifications specification status comment media source extensionsthe definition of '
texttracks' in that specification.
TextTrackList: addtrack event - Web APIs
the addtrack event is fired when a track is added to a
texttracklist.
... bubbles no cancelable no interface trackevent event handler property onaddtrack examples using addeventlistener(): const mediaelement = document.queryselector('video, audio'); mediaelement.
texttracks.addeventlistener('addtrack', (event) => { console.log(`text track: ${event.track.label} added`); }); using the onaddtrack event handler property: const mediaelement = document.queryselector('video, audio'); mediaelement.
texttracks.onaddtrack = (event) => { console.log(`text track: ${event.track.label} added`); }; specifications specification status html living standardthe definition of 'addtrack' in that specification.
TextTrackList: change event - Web APIs
the change event is fired when a text track is made active or inactive, or a
texttracklist is otherwise changed.
... bubbles no cancelable no interface event event handler property onchange examples using addeventlistener(): const mediaelement = document.queryselectorall('video, audio')[0]; mediaelement.
texttracks.addeventlistener('change', (event) => { console.log(`'${event.type}' event fired`); }); using the onchange event handler property: const mediaelement = document.queryselector('video, audio'); mediaelement.
texttracks.onchange = (event) => { console.log(`'${event.type}' event fired`); }; specifications specification status html living standardthe definition of 'change' in that specification.
TextTrackList: removeTrack event - Web APIs
the removetrack event is fired when a track is removed from a
texttracklist.
... bubbles no cancelable no interface trackevent event handler property onremovetrack examples using addeventlistener(): const mediaelement = document.queryselector('video, audio'); mediaelement.
texttracks.addeventlistener('removetrack', (event) => { console.log(`text track: ${event.track.label} removed`); }); using the onremovetrack event handler property: const mediaelement = document.queryselector('video, audio'); mediaelement.
texttracks.onremovetrack = (event) => { console.log(`text track: ${event.track.label} removed`); }; specifications specification status html living standardthe definition of 'removetrack' in that specification.
Index - Web APIs
1490 globaleventhandlers.oncuechange api, event handler, globaleventhandlers, property, reference,
texttrack, webvtt, text track, track, vtt the oncuechange property of the globaleventhandlers mixin is the eventhandler for processing cuechange events.
... 1831 htmlmediaelement.
texttracks api, audio, html dom, htmlmediaelement, media, property, reference, tracks, video, web,
texttracks the read-only
texttracks property on htmlmediaelement objects returns a
texttracklist object listing all of the
texttrack objects representing the media element's text tracks 1832 mscleareffects mscleareffects no summary!
... 1947 htmltrackelement: cuechange event api, accessibility, audio, chapters, descriptions, html
texttrack, media, reference, text,
texttrack, video, webvtt, a11y, captions, cuechange, events, oncuechange, track, vtt the cuechange event fires when a
texttrack has changed the currently displaying cues.
...And 15 more matches
HTMLTrackElement: cuechange event - Web APIs
the cuechange event fires when a
texttrack has changed the currently displaying cues.
... the event is fired at both the
texttrack and at the htmltrackelement in which it's being presented, if any.
... bubbles no cancelable no interface event event handler oncuechange examples on the
texttrack you can set up a listener for the cuechange event on a
texttrack using the addeventlistener() method: track.addeventlistener('cuechange', function () { let cues = track.activecues; // array of current cues }); or you can just set the oncuechange event handler property: track.oncuechange = function () { let cues = track.activecues; // array of current cues } on the track element the underlying
texttrack, indicated by the track property, receives a cuechange event every time the currently-presented cue is changed.
... let
texttrackelem = document.getelementbyid("
texttrack");
texttrackelem.addeventlistener("cuechange", (event) => { let cues = event.target.track.activecues; }); in addition, you can use the oncuechange event handler: let
texttrackelem = document.getelementbyid("
texttrack");
texttrackelem.oncuechange = (event) => { let cues = event.target.track.activecues; }); specifications specification status html living standardthe definition of 'cuechange' in that specification.
getTrackById() - Web APIs
the
texttracklist method gettrackbyid() returns the first
texttrack object from the track list whose id matches the specified string.
... syntax var thetrack =
texttracklist.gettrackbyid(id); paramters id a domstring indicating the id of the track to locate within the track list.
... return value a
texttrack object indicating the first track found within the
texttracklist whose id matches the specified string.
... specifications specification status comment html living standardthe definition of '
texttracklist.gettrackbyid()' in that specification.
Adding captions and subtitles to HTML5 video - Developer guides
initial setup as with all the other buttons, one of the first things we need to do is store a handle to the subtitles' button: var subtitles = document.getelementbyid('subtitles'); we also initially turn off all subtitles, in case the browser turns any of them on by default: for (var i = 0; i < video.
texttracks.length; i++) { video.
texttracks[i].mode = 'hidden'; } the video.
texttracks property contains an array of all the text tracks attached to the video.
... all we need to do is to go through the video's
texttracks, reading their properties and building the menu up from there: var subtitlesmenu; if (video.
texttracks) { var df = document.createdocumentfragment(); var subtitlesmenu = df.appendchild(document.createelement('ul')); subtitlesmenu.classname = 'subtitles-menu'; subtitlesmenu.appendchild(createmenuitem('subtitles-off', '', 'off')); for (var i = 0; i < video.
texttracks.length; i++) {...
... subtitlesmenu.appendchild(createmenuitem('subtitles-' + video.
texttracks[i].language, video.
texttracks[i].language, video.
texttracks[i].label)); } videocontainer.appendchild(subtitlesmenu); } this code creates a documentfragment, which is used to hold an unordered list containing our subtitles menu.
...nactive'); button.appendchild(document.createtextnode(label)); button.addeventlistener('click', function(e) { // set all buttons to inactive subtitlemenubuttons.map(function(v, i, a) { subtitlemenubuttons[i].setattribute('data-state', 'inactive'); }); // find the language to activate var lang = this.getattribute('lang'); for (var i = 0; i < video.
texttracks.length; i++) { // for the 'subtitles-off' button, the first condition will never match so all will subtitles be turned off if (video.
texttracks[i].language == lang) { video.
texttracks[i].mode = 'showing'; this.setattribute('data-state', 'active'); } else { video.
texttracks[i].mode = 'hidden'; } } subtitl...
HTMLTrackElement - Web APIs
htmltrackelement.track read only returns
texttrack is the track element's text track data.
... cuechange sent when the underlying
texttrack has changed the currently-presented cues.
... this event is always sent to the
texttrack but is also sent to the htmltrackelement if one is associated with the track.
TrackEvent - Web APIs
events based on trackevent are always sent to one of the media track list types: events involving video tracks are always sent to the videotracklist found in htmlmediaelement.videotracks events involving audio tracks are always sent to the audiotracklist specified in htmlmediaelement.audiotracks events affecting text tracks are sent to the
texttracklist object indicated by htmlmediaelement.
texttracks.
...if not null, this is always an object of one of the media track types: audiotrack, videotrack, or
texttrack).
... var videoelem = document.queryselector("video"); videoelem.videotracks.addeventlistener("addtrack", handletrackevent, false); videoelem.videotracks.addeventlistener("removetrack", handletrackevent, false); videoelem.audiotracks.addeventlistener("addtrack", handletrackevent, false); videoelem.audiotracks.addeventlistener("removetrack", handletrackevent, false); videoelem.
texttracks.addeventlistener("addtrack", handletrackevent, false); videoelem.
texttracks.addeventlistener("removetrack", handletrackevent, false); function handletrackevent(event) { var trackkind; if (event.target instanceof(videotracklist)) { trackkind = "video"; } else if (event.target instanceof(audiotracklist)) { trackkind = "audio"; } else if (event.target instanceof(
texttracklist)) { ...
GlobalEventHandlers.oncuechange - Web APIs
the cuechange event fires when a
texttrack has changed the currently displaying cues.
... the event is sent to both the
texttrack and to the <track> element the track is being presented by, if any; in the latter case, its handler is on an htmltrackelement object.
HTMLMediaElement - Web APIs
htmlmediaelement.
texttracks read only returns the list of
texttrack objects contained in the element.
... htmlmediaelement.add
texttrack() adds a text track (such as a track for subtitles) to a media element.
TrackEvent() - Web APIs
the trackevent() constructor creates and returns a new trackevent object describing an event which occurred on a list of tracks (audiotracklist, videotracklist, or
texttracklist).
... eventinfo optional an optional dictionary providing additional information configuring the new event; it can contain the following fields in any combination: track optional the track to which the event refers; this is null by default, but should be set to a videotrack, audiotrack, or
texttrack as appropriate given the type of track.
TrackEvent.track - Web APIs
this will be an audiotrack, videotrack, or
texttrack object.
... syntax track = trackevent.track; value an object which is one of the types audiotrack, videotrack, or
texttrack, depending on the type of media represented by the track.
VTTCue - Web APIs
properties this interface also inherits properties from
texttrackcue.
... example html <video controls src="https://udn.realityripple.com/samples/c6/f8a3489533.webm"></video> css video { width: 320px; height: 180px; } javascript let video = document.queryselector('video'); video.addeventlistener('loadedmetadata', () => { const track = video.add
texttrack("captions", "简体中文subtitles", "zh_cn"); track.mode = "showing"; const cuecn = new vttcue(0, 2.500, '字幕会在0至2.5秒间显示'); track.addcue(cuecn); const cueen = new vttcue(2.6, 4, 'subtitles will display between 2.6 and 4 seconds'); track.addcue(cueen); }); result chrome: please open in jsfiddle to view the live sample.
<track>: The Embed Text Track element - HTML: Hypertext Markup Language
detecting cue changes the underlying
texttrack, indicated by the track property, receives a cuechange event every time the currently-presented cue is changed.
... let
texttrackelem = document.getelementbyid("
texttrack");
texttrackelem.addeventlistener("cuechange", (event) => { let cues = event.target.track.activecues; }); in addition, you can use the oncuechange event handler: let
texttrackelem = document.getelementbyid("
texttrack");
texttrackelem.oncuechange = (event) => { let cues = event.target.track.activecues; }); examples <video controls poster="/images/sample.gif"> <source src="sample.mp4" type="video/mp4"> <source src="sample.ogv" type="video/ogv"> <track kind="captions" src="samplec...
The HTML DOM API - Web APIs
audiotrack audiotracklist mediaerror
texttrack texttrackcue
texttrackcuelist
texttracklist timeranges trackevent videotrack videotracklist drag and drop interfaces these interfaces are used by the html_drag_and_drop_api to represent individual draggable (or dragged) items, groups of dragged or draggable items, and to handle the drag and drop process.
Media Source API - Web APIs
audiotrack.sourcebuffer, videotrack.sourcebuffer,
texttrack.sourcebuffer returns the sourcebuffer that created the track in question.
SourceBuffer - Web APIs
sourcebuffer.
texttracks read only a list of the text tracks currently contained inside the sourcebuffer.
Web Video Text Tracks Format (WebVTT) - Web APIs
d to expose webvtt cues in dom api: enum autokeyword { "auto" }; enum directionsetting { "" /* horizontal */, "rl", "lr" }; enum linealignsetting { "start", "center", "end" }; enum positionalignsetting { "line-left", "center", "line-right", "auto" }; enum alignsetting { "start", "center", "end", "left", "right" }; [constructor(double starttime, double endtime, domstring text)] interface vttcue :
texttrackcue { attribute vttregion?
Web APIs
eechsynthesiserrorevent speechsynthesisevent speechsynthesisutterance speechsynthesisvoice staticrange stereopannernode storage storageestimate storageevent storagemanager storagequota stylepropertymap stylepropertymapreadonly stylesheet stylesheetlist submitevent subtlecrypto syncevent syncmanager t taskattributiontiming text textdecoder textencoder textmetrics textrange
texttrack texttrackcue
texttracklist timeevent timeranges touch touchevent touchlist trackdefault trackdefaultlist trackevent transferable transformstream transitionevent treewalker typeinfo u uievent ulongrange url urlsearchparams urlutilsreadonly usb usbalternateinterface usbconfiguration usbdevice usbendpoint usbintransferresult usbinterface usbisochronousintransferpacket usbisochrono...
HTML documentation index - HTML: Hypertext Markup Language
213 <track>: the embed text track element accessibility, cues, element, html, html embedded content, html5, multimedia, reference,
texttrack, web, a11y, track the html <track> element is used as a child of the media elements, <audio> and <video>.