How do I duplicate item when using jquery sortable?

Question

I am using this method http://jqueryui.com/demos/sortable/#connect-lists to connect two lists that i have. I want to be able to drag from list A to list B but when the item is dropped, i need to keep the original one still in list A. I checked the options and events but I believe there is nothing like that. Any approaches?

Answer 1

$("#sortable1").sortable({
    connectWith: ".connectedSortable",
    forcePlaceholderSize: false,
    helper: function (e, li) {
        copyHelper = li.clone().insertAfter(li);
        return li.clone();
    },
    stop: function () {
        copyHelper && copyHelper.remove();
    }
});
$(".connectedSortable").sortable({
    receive: function (e, ui) {
        copyHelper = null;
    }
});