Not sure if your still looking for this answer but I found a way to do this. Might be a little hacky but all I needed to do the same thing and this was what I figured out.$("#element).draggable({ stop: function( event, ui ) { if ( $.ui.ddmanager.drop( $(this).data("draggable"), event ) ) { alert( 'was dropped' ); } else { alert( 'it was not dropped' ); } }});I found that the $.ui.ddmanager.drop method takes a draggable object and the event. It looks to see if the draggable object was dropped on a valid target. If it was it returns the object it was dropped on. If it wasn't it returns false.Hope this helps.good luck,-Jeff