How to execute an function if something is dragged?

I made this code.

  $(function() {
        $( "#xcontainer" ).sortable({
            cursor: 'pointer',
            revert: true
        });

        $("div" ).disableSelection();
    }); 

Code (markup):

The problem is that i also wish to do something like document.getElementBy("msg").innerHTML = " Updated " if the user wish to drag an element.

 

Can you try this

  $(function() {
        $( "#xcontainer" ).sortable({
            cursor: 'pointer',
            revert: true,
            stop: function() { alert('stopped');}
        });

        $("div" ).disableSelection();
    });

Code (markup):