Baseline Widely available
The addtrack event is fired when a track is added to a TextTrackList.
Use the event name in methods like addEventListener(), or set an event handler property.
addEventListener("addtrack", (event) => { })
onaddtrack = (event) => { }
In addition to the properties listed below, properties from the parent interface, Event, are available.
track Read only
The TextTrack object to which the event refers.
Using addEventListener():
const mediaElement = document.querySelector("video, audio");
mediaElement.textTracks.addEventListener("addtrack", (event) => {
console.log(`Text track: ${event.track.label} added`);
});
Using the onaddtrack event handler property:
const mediaElement = document.querySelector("video, audio");
mediaElement.textTracks.onaddtrack = (event) => {
console.log(`Text track: ${event.track.label} added`);
};
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