MediaStream: addtrack event

The addtrack event is fired when a new MediaStreamTrack object has been added to a MediaStream.

This event is not cancelable and does not bubble.

Syntax

Use the event name in methods like {{domxref("EventTarget.addEventListener", "addEventListener()")}}, or set an event handler property.

js-nolint

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

onaddtrack = (event) => { }

A {{domxref("MediaStreamTrackEvent")}}. Inherits from {{domxref("Event")}}.

Also inherits properties from its parent interface, {{domxref("Event")}}.

{{domxref("MediaStreamTrackEvent.track")}} {{ReadOnlyInline}}
- : A {{domxref("MediaStreamTrack")}} object representing the track which was added to the stream.

Using addEventListener():

const stream = new MediaStream();

stream.addEventListener("addtrack", (event) => {
  console.log(`New ${event.track.kind} track added`);
});

Using the onaddtrack event handler property:

const stream = new MediaStream();

stream.onaddtrack = (event) => {
  console.log(`New ${event.track.kind} track added`);
};