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web api event

TextTrackList: addtrack event

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The addtrack event is fired when a track is added to a TextTrackList.

Syntax

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

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

onaddtrack = (event) => { }

Event type

A TrackEvent. Inherits from Event.

Examples

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`);
};

Specifications

SpecificationsStandards references are available on the canonical MDN page.

Browser compatibility

Browser compatibilityCompatibility data is available on the canonical MDN page.

See also