Proprietà HTML Audio/Video DOM textTracks

Ottieni il numero di tracce di testo disponibili:

var vid = document.getElementById("myVideo");
alert(vid.textTracks.length);

Definizione e utilizzo

La proprietà textTracks restituisce un oggetto TextTrackList.

L'oggetto TextTrackList rappresenta le tracce di testo disponibili per l'audio/video.

Ciascuna traccia di testo disponibile è rappresentata da un oggetto TextTrack.

I numeri nella tabella specificano la prima versione del browser che supporta completamente la proprietà.

Property
textTracks	Yes	10.0	33.0	6.0	Yes

audio|video.textTracks

Type	Description
TextTrackList Object	Represents the available text tracks for the the audio/video. TextioTrackList Object: length - get the number of text tracks available in the audio/video [index] - get TextTrack object by index Note: The first available TextTrack object is index 0
TextTrack Object	Represents an text track. TextTrack Object Properties: 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") cues - get a list of cues as a TextTrackCueList object activeCues - get the currently active text track cues as a TextTrackCueList object addCue(cue) - add a cue to the list of cues removeCue(cue) - remove a cue from the list of cues

Type

Description

TextTrackList Object

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

TextioTrackList Object:

Note: The first available TextTrack object is index 0

TextTrack Object

Represents an text track.

TextTrack Object Properties:

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")
cues - get a list of cues as a TextTrackCueList object
activeCues - get the currently active text track cues as a TextTrackCueList object
addCue(cue) - add a cue to the list of cues
removeCue(cue) - remove a cue from the list of cues