as

Settings
Sign out
Notifications
Alexa
Amazonアプリストア
AWS
ドキュメント
Support
Contact Us
My Cases
開発
設計と開発
公開
リファレンス
サポート
アクセスいただきありがとうございます。こちらのページは現在英語のみのご用意となっております。順次日本語化を進めてまいりますので、ご理解のほどよろしくお願いいたします。

TextTrackList

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

Extends

Properties

length

length: number

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


onaddtrack?

optional onaddtrack: EventListener

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


onchange?

optional onchange: EventListener

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


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


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


getTrackById()

getTrackById(id): TextTrack

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

Parameters

id

string

Returns

TextTrack


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


Last updated: Oct 02, 2025