when using AJAX forms about ladda-bootstrap HOT 1 OPEN

            $('#add_ub_btn').click(function(){
                var l = Ladda.create(this);
                l.start();
                $.ajax({
                    url: '...',
                    type: "post",
                    data: {.......},
                    success: function(){
                       .......
                    }

                }).always(
                        function() {
                            l.stop();
                        }
                );
            });