[shyxeroks]

Paul12345, как вариант, пробуйте так:

<div class="box-cart-bottom">
            <div id="hidden">
                <p id="add_to_cart" class="buttons_bottom_block no-print">
                    <input type="hidden" name="product_id" value="{$product.id}">
                    <button type="submit" class="exclusive btn button ajax_add_to_cart_button">
                        <span>[`Add to cart`]</span>
                    </button>
                </p>
            </div>{shopStorequickorderPlugin::product_button()}
          <div class="order-in-cart-block"><a href="/cart" class="button-order-in-cart">Перейти в корзину</a></div>    
</div>
<script>
this.form.submit(function() {
        var f = $(this);
        $.post(f.attr('action') + '?html=1', f.serialize(), function(response) {
            if (response.status == 'ok') {
                if($('#product').hasClass('content_only')) {
                    var cart_total = window.parent.$(".shopping_cart");
                } else {
                    var cart_total = $(".shopping_cart");
                }
                
                var cart_div = f;

                

                var clone = $('<div class="cart"></div>').append(f.clone());
                if (cart_div.closest('.dialog').length) {
                    clone.insertAfter(cart_div.closest('.dialog'));
                } else {
                    clone.insertAfter(cart_div);
                }
                clone.css({
                    top: cart_div.offset().top - $(window).scrollTop(),
                    left: cart_div.offset().left,
                    width: cart_div.width() + 'px',
                    height: cart_div.height() + 'px',
                    position: 'fixed',
                    overflow: 'hidden',
                    'z-index': 9999
                }).animate({
                    top: cart_total.offset().top,
                    left: cart_total.offset().left,
                    width: 0,
                    height: 0
                }, 500, function() {
                    $(this).remove();
                    var quantity_wanted = parseInt($('#quantity_wanted').val());
                    if (cart_total.find('dt[data-id=' + response.data.item_id + ']').length) {
                        var item = cart_total.find('dt[data-id=' + response.data.item_id + ']');
                        var quantity = parseInt(item.find('.quantity').text());
                        item.find('.quantity').text(quantity + quantity_wanted);
                        cart_total.find('.ajax_block_cart_total').html(response.data.total);
                        cart_total.find('.ajax_cart_quantity').text(response.data.count);
                    } else {
                        var info = cart_div.find('.ajax_product_info');

                        var tpl_data = {
                            url: info.data('url'),
                            name: info.data('name'),
                            img: info.data('img'),
                            price: info.data('price'),
                            quantity: quantity_wanted,
                            id: response.data.item_id
                        };

                        $('#cart_block_list_item_tmpl').tmpl(tpl_data).appendTo(cart_total.find('.cart_block_list .products'));
                        cart_total.find('.ajax_block_cart_total').html(response.data.total);
                        cart_total.find('.ajax_cart_quantity').html(response.data.count);
                        cart_total.find('.ajax_cart_discount').html(response.data.discount);


                        cart_total.find('.ajax_cart_no_product').addClass('unvisible');
                        cart_total.find('.ajax_cart_product_txt_s').removeClass('unvisible');
                        cart_total.find('.ajax_cart_quantity').removeClass('unvisible');

                    }
                });

                if (cart_div.closest('.dialog').length) {
                    cart_div.closest('.dialog').hide().find('.cart').empty();
                    $("#hidden").css('display','none');
	            $(".order-in-cart-block").fadeIn(400);
                }

                if (response.data.error) {
                    alert(response.data.error);
                }
				
            } else if (response.status == 'fail') {
                alert(response.errors);
            }
        }, "json");
        return false;
    });

</script>

В js коде у Вас в конце лишняя скобка.