Sortable Update Hidden List Field

$(function() {
    $( ".sortColumn" ).sortable({
        connectWith: ".sortColumn",
        placeholder: "portlet-placeholder",
        update : function () { 
            $('input.position').each(function() {           
                var parentID = $(this).parent().parent().attr('ID');
                $(this).val( parentID );
            });
        }
    });

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

ที่มา : Update Hidden List Field on jQuery UI Sortable?