VideoTrackList: addtrack event

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

The addtrack event is fired when a video track is added to a VideoTrackList.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

js
addEventListener("addtrack", (event) => {});

onaddtrack = (event) => {};

Event type

Event properties

In addition to the properties listed below, properties from the parent interface, Event, are available.

track Read only

The newly-added VideoTrack the event is in reference to.

Examples

Using addEventListener():

js
const videoElement = document.querySelector("video");

videoElement.videoTracks.addEventListener("addtrack", (event) => {
  console.log(`Video track: ${event.track.label} added`);
});

Using the onaddtrack event handler property:

js
const videoElement = document.querySelector("video");

videoElement.videoTracks.onaddtrack = (event) => {
  console.log(`Video track: ${event.track.label} added`);
};

Specifications

Specification
HTML
# event-media-addtrack
HTML
# handler-tracklist-onaddtrack

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
addtrack event

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
User must explicitly enable this feature.
Has more compatibility info.

See also