ajax добавление в корзину

  	<form action="/shop/addtocart" method="post" id="addtocartform" enctype="multipart/form-data">
 	   <input type="hidden" name="add_to_cart_item_id" value="{$item.id}">
  	   <input type="submit" name="addtocart" class="submit" style="font-size: 18pt;" value="заказать">
	</form>

 
	   $('#addtocartform').submit(function(e){
		   e.preventDefault();
		   $.ajax({
			   url: "/shop/addtocart",
			   method: "POST",
			   data: ('#addtocartform').serialize,
			   success: function(response){
				   showForm();
			   }
		   })
	   })
 

$('#addtocartform').serialize()