The read-only TextTrackList
property length
returns the number of entries in the TextTrackList
, each of which is a TextTrack
representing one track in the media element.
A value of 0 indicates that there are no text tracks in the media.
The read-only TextTrackList
property length
returns the number of entries in the TextTrackList
, each of which is a TextTrack
representing one track in the media element.
A value of 0 indicates that there are no text tracks in the media.
A number indicating how many text tracks are included in the TextTrackList
. Each track can be accessed by treating the TextTrackList
as an array of objects of type TextTrack
.
This snippet gets the number of text tracks in the first media element found in the DOM by querySelector()
.
js
const mediaElem = document.querySelector("video, audio"); let numTextTracks = 0; if (mediaElem.textTracks) { numTextTracks = mediaElem.textTracks.length; }
Note that this sample checks to be sure HTMLMediaElement.textTracks
is defined, to avoid failing on browsers without support for TextTrack
.
Specification |
---|
HTML Standard # dom-texttracklist-length |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
length |
23 | 12 | 31 | 10 | ≤12.1 | 6 | 4.4 | 25 | 31 | ≤12.1 | 7 | 1.5 |
© 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/TextTrackList/length