AudioTrackList.onchange

The AudioTrackList property onchange is an event handler which is called when the change event occurs, indicating that one or more of the AudioTracks in the AudioTrackList have been enabled or disabled.

The event is passed into the event handler in the form of an Event object; the event doesn't provide any additional information. To determine the new state of media's tracks, you'll have to look at their AudioTrack.enabled flags.

Note: You can also add a handler for the change event using addEventListener().

Syntax

AudioTrackList.onchange = eventHandler;

Value

Set onchange to a function that should be called whenever tracks are enabled or disabled on the media element.

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").audioTracks;

trackList.onchange = function(event) {
  trackList.forEach(function(track) {
    updateTrackEnabledButton(track.id, track.enabled);
  });
};

The updateTrackEnabledButton(), in this example, should be a function that finds a user interface control using the track's id (perhaps the app uses the track ID as the control element's ID) and the track's enabled flag to determine which state the control should be in now.

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'AudioTrackList.onchange' in that specification.
Living Standard
HTML5
The definition of 'AudioTrackList.onchange' in that specification.
Recommendation

Browser compatibility

DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
onchangeChrome Full support 45
Disabled
Full support 45
Disabled
Disabled From version 45: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.
Edge Full support 79
Disabled
Full support 79
Disabled
Disabled From version 79: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).
No support 12 — 79
Firefox Full support 33
Disabled
Full support 33
Disabled
Disabled From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE Full support 10Opera Full support 32
Disabled
Full support 32
Disabled
Disabled From version 32: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).
Safari Full support 6.1WebView Android Full support 45Chrome Android Full support 45
Disabled
Full support 45
Disabled
Disabled From version 45: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.
Firefox Android Full support 33
Disabled
Full support 33
Disabled
Disabled From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android Full support 32
Disabled
Full support 32
Disabled
Disabled From version 32: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).
Safari iOS Full support 7Samsung Internet Android No support No

Legend

Full support
Full support
No support
No support
User must explicitly enable this feature.
User must explicitly enable this feature.