MediaStream: addtrack event

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

Using addEventListener():

let stream = new MediaStream();

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

Using the onaddtrack event handler property:

let stream = new MediaStream();

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

• Related events: removetrack
• This event on AudioTrackList targets: addtrack
• This event on VideoTrackList targets: addtrack
• Media Streams API
• WebRTC