The VideoTrackList
property onaddtrack
is an event handler which is called when the addtrack
event occurs, indicating that a new video track has been added to the media element whose video tracks the VideoTrackList
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
VideoTrackList.onaddtrack = eventHandler;
Value
Set onaddtrack
to a function that accepts as input a TrackEvent
object which indicates in its track
property which video 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 video tracks are represented by the VideoTrackList
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 video track in the media resource.
Example
This snippet establishes a handler for the addtrack
event that calls a function, addToTrackList()
, passing in the VideoTrack
object representing the newly-added track. In this scenario, that function's role is to add the new track to a list of video tracks available to choose from.
document.querySelector("video").videoTracks.onaddtrack = function(event) { addToTrackList(event.track); };
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'VideoTrackList: onaddtrack' in that specification. |
Living Standard |
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.