Unloading and loading of Video.js text tracks while updating their menuButton

textTrackLoading

(function() {
	'use strict';
	
	videojs.Player.prototype.unloadTextTracks = function( kind ) {
		var kinds = ['captions','subtitles','chapters','descriptions','metadata'];
		var i;
		var tracks = this.textTracks_ = this.textTracks_ || [];
		
		// If no specific type is specified then clear them all
		if ( !kind ) {
			for ( i = 0; i < kinds.length; i++ ) { // clear them all
				this.unloadTextTracks( kinds[i] );
			}
			return;
		}
		
		// Remove them from their respective buttons
		this.clearTrackButton( kind );
		
		// Remove them from the tracks array.
		for ( i = tracks.length-1; i >= 0; i-- ) {
			if ( tracks[i] && tracks[i].options_.kind === kind ) {
				tracks[i].deactivate();
				tracks[i].dispose();
				tracks.splice(i,1);
			}
		}
		
	};
	
	videojs.Player.prototype.clearTrackButton = function( kind ) {
		var controlBar = this.controlBar;
		if ( controlBar[kind + 'Button'] ) {
			// Remove all children (menus);
			while( controlBar[kind + 'Button'].children_.length ) {
				controlBar[kind + 'Button'].children_[0].dispose();
			}
			controlBar[kind + 'Button'].hide();
		}
	};
	
	var addTextTrackSuper_ = videojs.Player.prototype.addTextTrack;
	videojs.Player.prototype.addTextTrack = function(kind, label, language, options) {
		// Call the original addTextTrack function.
		addTextTrackSuper_.apply(this, arguments);
		
		// Clear the menu
		this.clearTrackButton( kind );
		
		// Re-create the menu and show it
		var button = this.controlBar[kind + 'Button'];
		button.menu = button.createMenu();
		button.addChild( button.menu );
		button.show();
	};
})();