AudioTrackList: length property
The read-only AudioTrackList
property length
returns the number of entries in the
AudioTrackList
, each of which is an AudioTrack
representing one audio track in the media element. A value of 0 indicates that
there are no audio tracks in the media.
Value
A number indicating how many audio tracks are included in the
AudioTrackList
. Each track can be accessed by treating the
AudioTrackList
as an array of objects of type AudioTrack
.
Examples
This snippet gets the number of audio tracks in the first <video>
element found in the DOM by querySelector()
.
js
const videoElem = document.querySelector("video");
let numAudioTracks = 0;
if (videoElem.audioTracks) {
numAudioTracks = videoElem.audioTracks.length;
}
Note that this sample checks to be sure HTMLMediaElement.audioTracks
is
defined, to avoid failing on browsers without support for AudioTrack
.
Specifications
Specification |
---|
HTML Standard # dom-audiotracklist-length-dev |
Browser compatibility
BCD tables only load in the browser