JQuery sortable draggable bug.

JQuery sortable Update event calls twice when you bind it to class, not to id and when you drag item to other connectable block.

Jquery

$(".MyClass1, .MyClass2").sortable({
    connectWith: ".connectedSortable",
    update: function (event, ui) {
                alert("twice!");
            }})

Very simple solution is to change event "update" to "stop":

Jquery

$(".MyClass1, .MyClass2").sortable({

    connectWith: ".connectedSortable",

    stop: function (event, ui) {

                alert("once!");

            }})