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HTML Audio/Video-DOM-Attribut textTracks

Das read-only-Attribut textTracks des HTMLMediaElement-Objekts gibt eine TextTrackList-Instanz zurück, die alle TextTrack-Objekte auflistet, die die Textspuren des Medienelements darstellen, in der Reihenfolge, in der sie in der Textspur-Liste stehen.

　HTML Audio/Video DOM Reference Manual

Online example

Get the number of available text tracks:

Example

!DOCTYPE html
<html>
<head>
<meta charset="utf-8">
<title>HTML Audio/Video textTracks attribute usage-Basic tutorial(oldtoolbag.com)</<title>
</<head>
<body>
<button onclick="getTextTracks()" type="button">Get the number of available text tracks</button>
<br>　
<video id="video1" controls="controls">
　　<source src="movie.mp4" type="video/mp4">
　　<source src="movie.ogg" type="video/ogg">
　　<track src="demo_sub.vtt">
　　Your browser does not support HTML5　video tag.
</video>
<script>
myVid=document.getElementById("video1");
function getTextTracks()
{　
　　alert(myVid.textTracks.length);
}　
</script>
</body>
</html>

Test to see ‹/›

Definition and usage

The textTracks property returns a TextTrackList object.
The TextTrackList object represents audio/The available text tracks of the video.
Each available text track is represented by a TextTrack object.

Browser compatibility

IEFirefoxOperaChromeSafari

Internet Explorer 10Opera, Chrome and Safari 6 Supports the textTracks attribute.

Note:Internet Explorer 9 And earlier versions do not support the textTracks attribute.

Syntax

audio|video.textTracks

Return value

Type	Description
TextTrackList object	Represents audio/The available text tracks of the video. TextioTrackList object: length - Get audio/The number of available text tracks in the video [index] - According to the index index to obtain the TextTrack object Note:Index of the first available text track index is 0.
TextTrack object	Represents a text track. Properties of the TextTrack 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 whether the track is active ("disabled"\|"hidden"\|"showing") cues - Get the cues list of the TextTrackCueList object activeCues - Get the current active text track cues in the form of a TextTrackCueList object addCue(cue) - Add a cue to the cues list removeCue(cue) - Remove a cue from the cues list

　HTML Audio/Video DOM Reference Manual

HTML: <template> Tag