The TrackEvent() constructor creates and returns a new TrackEvent object describing an event which occurred on a list of tracks (AudioTrackList, VideoTrackList, or TextTrackList).
Syntax
trackEvent = new TrackEvent(type, eventInfo);
Parameters
type- The type of track event which is described by the object:
"addtrack"or"removetrack". eventInfoOptional- An optional dictionary providing additional information configuring the new event; it can contain the following fields in any combination:
trackOptional- The track to which the event refers; this is
nullby default, but should be set to aVideoTrack,AudioTrack, orTextTrackas appropriate given the type of track. bubblesOptional- A Boolean indicating whether the event bubbles or not.
cancelableOptional- A Boolean indicating whether or not the event can be canceled.
composedOptional- A Boolean indicating whether or not the event will trigger listeners outside of a shadow root; see
Event.composedfor more details.
Return value
A newly-created TrackEvent object, initialized as described by the inputs to the constructor.
Specifications
| Specification | Status | Comment |
|---|---|---|
| HTML Living Standard The definition of 'TrackEvent()' in that specification. |
Living Standard | Initial definition. |
| HTML5 The definition of 'TrackEvent()' in that specification. |
Recommendation | Initial definition. |
Browser compatibility
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