fix wrong this scope

static/application.js

@@ -176,8 +176,9 @@ function addSetting(ob) {
 		window["label_"+ob.id]   = reflb;  // Is this still needed?
 		// Add event function to input
 		refin.on("input", function () {
+			var that = this
 			sliders_throttle(ob.id, function () {
-			    socket.send({'cmd': $(this).attr('id'), 'data': $(this).val()});
+			    socket.send({'cmd': $(that).attr('id'), 'data': $(that).val()});
 			});
 		    }
 		);