jQuery draggable + droppable: how to snap dropped element to dropped-on element

Question

I have my screen divided into two DIVs. In the left DIV I have a few 50x50 pixel DIVs, in the right DIV I have an empty g

Answer 1

based on Barry's code, what if we d like to add an option with an "x" button the element to be detached again from the new parent and be reattached to the initial?

i thought sth like this, but didn't seem to work.. to make some sort of a variable that hold initial state

var flag;
$('.draggable-div').draggable({
    revert: 'invalid',
    stop: function(){
        $(this).draggable('option','revert','invalid');
        $(this).find('.undo').show();
    flag=$(this).parent();
    }
});


$('.draggable-div').find('.undo').click(function(i, e) {
    var $div = $(this).parent();
$($div).detach().appendTo(flag);
 }

sth is definately wrong but i don't know if you can get the concept... just being able to reverse whatever you have dropped to their initial state.