These API calls are used to listen to or update the active captions track if one or more closed captions tracks are provided with a video. This API can be used to log captions usage or build your own CC menu outside JW Player.
setCurrentCaptions(index) Change the visible captions track to the provided index. The index must be within the list provided by getCaptionsList. Note an index of 0 always turns the captions Off.
onCaptionsList(callback) Fired when the list of available captions tracks is updated. Happens shortly after a playlist item starts playing. Event attributes: tracks (Array): the full array with new captions tracks.
onCaptionsChange (callback) Fired when the active captions track is changed. Happens in respons to e.g. a user clicking the controlbar CC menu or a script calling setCurrentCaptions. Event attributes: track (Number): index of the new active captions track in the getCaptionsList() array. Note the captions are Off if the track is 0.
Example set up
Refer below API list for better understanding :
Multiple Subtitle Tracks
Adding Video Captions
Hope it helps :)
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