ajaxwishlist.js

_successHandler: function(data) {
            if (!data.success && data.error == 'not_logged_in') {
                alert({
                    title: 'Ajax Wishlist',
                    content: mageTemplate(this.options.notLoggedInErrorMessage, {
                        url: this.options.customerLoginUrl
                    })
                });

                return;
            }

            $(this.options.wishlistBlockSelector).replaceWith(data.wishlist);
            $('body').trigger('contentUpdated');

            if (this.options.isShowSuccessMessage && data.message) {
                alert({
                    title: 'Ajax Wishlist',
                    content: data.message
                });
            }
        },

        _errorHandler: function () {
            alert({
                title: 'Ajax Wishlist',
                content: mageTemplate(this.options.errorMessage)
            });
        }

});