VideoTrackList.onremovetrack - Web APIs 编辑

The VideoTrackList onremovetrack event handler is called when the removetrack event occurs, indicating that a video track has been removed from the media element, and therefore also from the VideoTrackList.

The event is passed into the event handler in the form of a TrackEvent object, whose track property identifies the track that was removed from the media element's VideoTrackList.

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

Syntax

VideoTrackList.onremovetrack = eventHandler;

Value

Set onremovetrack to a function that accepts as input a TrackEvent object which indicates in its track property which video track has been removed from the media element.

Example

This simple example just fetches the current number of video tracks in the media element whenever a track is removed from the media element.

document.querySelector("my-video").videoTracks.onremovetrack = function(event) {
  myTrackCount = document.querySelector("my-video").videoTracks.length;
};

The current number of video tracks remaining in the media element is obtained from VideoTrackList property length.

Specifications

Browser compatibility

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