Handling modelstate errors when hijaxing a form

gistfile1.js

        $(".hijax").submit(function (e) {
            var $form = $(this),
                validator = $form.data("validator");

            if (!$form.valid()) {
                return;
            };

            $.ajax({
                url: this.action,
                type: "POST",
                data: $form.serialize(),
                statusCode: {
                    400: function (xhr, textStatus, errorThrown) {
                        var errors = $.parseJSON(xhr.responseText);
                        validator.showErrors(errors);
                    }
                },
                error: function () {
                    // reset submit button
                    $("button[type=submit]").button("reset");
                }
            });

            e.preventDefault();
        });