HTML Audio/Video DOM textTracks Property

var vid = document.getElementById("myVideo");

function myFunction() {
  alert(vid.textTracks.length);
}

Meaning

The textTracks property returns a TextTrackList object representing the available text tracks.

Note: The first available TextTrack object is index 0.

audio|video.textTracks

Type	Description
TextTrackList Object	Returns the available text tracks for the the audio/video. length: get the number of text tracks available in the audio/video. [index]: get TextTrack object by index.
TextTrack Object	Returns an text track. activeCues: get the currently active text track cues as a TextTrackCueList object. addCue(cue): add a cue to the list of cues. cues: get a list of cues as a TextTrackCueList object. kind: get the type of the text track (can be: "subtitles", "caption", "descriptions", "chapters", or "metadata"). label: get the label of the text track. language: get the language of the text track. mode: get or set if the track is active ("disabled"\|"hidden"\|"showing").

Type

Description

TextTrackList Object

Returns the available text tracks for the the audio/video.

TextTrack Object

Returns an text track.

activeCues: get the currently active text track cues as a TextTrackCueList object.
addCue(cue): add a cue to the list of cues.
cues: get a list of cues as a TextTrackCueList object.
kind: get the type of the text track (can be: "subtitles", "caption", "descriptions", "chapters", or "metadata").
label: get the label of the text track.
language: get the language of the text track.
mode: get or set if the track is active ("disabled"|"hidden"|"showing").