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
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
onaddtrack | Chrome
Full support
45
| Edge
Full support
79
| Firefox
Full support
33
| IE Full support 10 | Opera
Full support
32
| Safari Full support 6.1 | WebView Android Full support 45 | Chrome Android
Full support
45
| Firefox Android
Full support
33
| Opera Android
Full support
32
| Safari iOS Full support 7 | Samsung 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.