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

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome 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 12Firefox 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.
Edge Mobile Full support YesFirefox 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 7.1Samsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown
User must explicitly enable this feature.
User must explicitly enable this feature.

Document Tags and Contributors

Contributors to this page: sideshowbarker, Sheppy
Last updated by: sideshowbarker,