TextTrackList: addtrack event

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

See full compatibility

The addtrack event is fired when a track is added to a TextTrackList.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("addtrack", (event) => { })

onaddtrack = (event) => { }

Event type

A TrackEvent. Inherits from Event.

Event properties

In addition to the properties listed below, properties from the parent interface, Event, are available.

track Read only: The TextTrack object to which the event refers.

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
HTML # event-media-addtrack
HTML # handler-tracklist-onaddtrack

Browser compatibility

	desktop					mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`addtrack` event	Chrome – Full support Chrome 23 (Release date: 2012-11-06) footnote Full support	Edge – Full support Edge 12 (Release date: 2015-07-29) footnote Full support	Firefox – Full support Firefox 31 (Release date: 2014-07-22) footnote Full support	Opera – Full support Opera 12.1 (Release date: 2012-11-20) footnote Full support	Safari – Full support Safari 6 (Release date: 2012-07-25) footnote Full support	Chrome Android – Full support Chrome Android 25 (Release date: 2013-02-27) footnote Full support	Firefox for Android – Full support Firefox for Android 31 (Release date: 2014-07-22) footnote Full support	Opera Android – Full support Opera Android 12.1 (Release date: 2012-10-09) footnote Full support	Safari on iOS – Full support Safari on iOS 7 (Release date: 2013-09-18) footnote Full support	Samsung Internet – Full support Samsung Internet 1.5 (Release date: 2013-09-25) footnote Full support	WebView Android – Full support WebView Android 4.4 (Release date: 2013-12-09) footnote Full support	WebView on iOS – Full support WebView on iOS 7 (Release date: 2013-09-18) footnote Full support

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Full support: Full support