AudioTrackList.onaddtrack

The AudioTrackList property onaddtrack is an event handler which is called when the addtrack event occurs, indicating that a new audio track has been added to the media element whose audio tracks the AudioTrackList represents.

The event is passed into the event handler in the form of a TrackEvent object, whose track property identifies the newly-added track.

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

Syntax

AudioTrackList.onaddtrack = eventHandler;

Value

Set onaddtrack to a function that accepts as input a TrackEvent object which indicates in its track property which audio 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 audio tracks are represented by the AudioTrackList object. This happens when tracks are added to the element when the media is first attached to the element; one addtrack event will occur for each audio track in the media resource.

Example

This snippet establishes a handler for the addtrack event that calls a function, addToTrackList(), passing in the AudioTrack object representing the newly-added track. In this scenario, that function's role is to add the new track to a list of audio tracks available to choose from.

document.querySelector("video").audioTracks.onaddtrack = function(event) {
  addToTrackList(event.track);
};

Specifications

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