Jquery UI sortable

admin.js

$('.sort-entity').each(function () {
            var e = $(this);
            var url = e.data('url');
            var entity = e.data('entity');
            e.find('td').each(function(){
                $(this).css('width', $(this).width() +'px');
            });
            e.sortable({
                update: function (event, ui) {
                    var $postData = {};
                    e.find('tr').each(function () {
                        var $this = $(this);
                        var $currentId = $this.data('entity-id');
                        if ($currentId !== undefined) {
                            $postData[$currentId] = $this.index() + 1;
                        }
                    });

                    if(url !== undefined) {
                        $.post(url, {
                            entity: entity,
                            weights: $postData
                        }, function(data){
                            console.log(data);
                            ui.item.removeClass('warning', 3000);
                        });
                    }
                    ui.item.addClass('warning');
                }
            });
        });