nl_tokens: Creates an instance of this class .
pl_tokens: function AudioTrackMenuItem ( player , options ) { classCallCheck ( this , AudioTrackMenuItem ) ; var track = options . track ; var tracks = player . audioTracks ( ) ; // Modify options for parent MenuItem class's init. <mask> . label = track . label || track . language || 'Unknown' ; options . selected = track . enabled ; var _this = possibleConstructorReturn ( this , _MenuItem . call ( this , player , options ) ) ; _this . track = track ; var changeHandler = bind ( _this , _this . handleTracksChange ) ; tracks . addEventListener ( 'change' , changeHandler ) ; _this . on ( 'dispose' , function ( ) { tracks . removeEventListener ( 'change' , changeHandler ) ; } ) ; return _this ; }