TextTrackList

For additional information, see https://html.spec.whatwg.org/multipage/media.html#texttracklist

Extends

• EventTarget

Properties

length

length: number

For additional information, see https://html.spec.whatwg.org/multipage/media.html#dom-texttracklist-length.

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onaddtrack?

optional onaddtrack: EventListener

For additional information, see https://html.spec.whatwg.org/multipage/media.html#handler-tracklist-onaddtrack.

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onchange?

optional onchange: EventListener

For additional information, see https://html.spec.whatwg.org/multipage/media.html#handler-tracklist-onchange.

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onremovetrack?

optional onremovetrack: EventListener

For additional information, see https://html.spec.whatwg.org/multipage/media.html#handler-tracklist-onremovetrack.

Methods

addEventListener()

addEventListener(type, listener, options?): void

Adds an event listener.

Parameters

type

string

The event to listen to.

listener

EventListener

The Event Handler function.

options?

Ignore.

boolean

AddEventListenerOptions

Returns

void

Inherited from

EventTarget.addEventListener

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dispatchEvent()?

optional dispatchEvent(event): boolean

Dispatches an event to the target

Parameters

event

Event

The event which signals an occurrenceo.

Returns

boolean

TODO

Add and define in the implementations, keep it optional for now.

Inherited from

EventTarget.dispatchEvent

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getTrackById()

getTrackById(id): TextTrack

For additional information, see https://html.spec.whatwg.org/multipage/media.html#dom-texttracklist-gettrackbyid.

Parameters

id

string

Returns

TextTrack

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removeEventListener()

removeEventListener(type, listener, options?): void

Removes an event listener.

Parameters

type

string

The event to listen to.

listener

EventListener

The Event Handler function to be removed.

options?

Ignore.

boolean

EventListenerOptions

Returns

void

Inherited from

EventTarget.removeEventListener

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Last updated: Sep 30, 2025