prestashop fix empty cart cookie overwritted

Hi guys

I found a way to fix this issue.

After many hours of trace code I found that cookie is being overwrited when ajax cart is enabled.

This is the cause that the order was lost and cart appears empty and this is the explaination :

– Supose the first time you visit the shop, no cookies are on your browser yet.

– When you add a product using ajax cart ( using a ajax_add_to_cart_button class button ) you are using this piece of code :
[shell]$(‘.ajax_add_to_cart_button’).unbind(‘click’).click(function(){
var idProduct =  $(this).attr(‘rel’).replace(‘ajax_id_product_’, »);
if ($(this).attr(‘disabled’) != ‘disabled’)
ajaxCart.add(idProduct, null, false, this);
return false;
});[/shell]
So you call ajaxCart.add() when you add a product.

Inside ajaxCart.add() there are two significant actions that modify your cookie:

first one is expand the cartblock. Basically open the cart box and send an ajax petition to include ‘expand’ parameter into your cookie
[shell]if ($(‘#cart_block #cart_block_list’).hasClass(‘collapsed’))
this.expand();[/shell]
and inside expand() the expand action the visual box slidedown :
[shell]$(‘#’+parentId+’ #cart_block #cart_block_summary’).slideUp(200, function(){
$(this).addClass(‘collapsed’).removeClass(‘expanded’);
$(‘#’+parentId+’ #cart_block #cart_block_list’).slideDown({
duration: 600,
complete: function(){$(this).addClass(‘expanded’).removeClass(‘collapsed’);}
});
});[/shell]
and store cookie value  :
[shell]$.ajax({
type: ‘GET’,
url: baseDir + ‘modules/blockcart/blockcart-set-collapse.php’,
async: true,
data: ‘ajax_blockcart_display=expand’ + ‘&rand=’ + new Date().getTime()
});[/shell]
Second one, adds the product in your cart.
[shell]$.ajax({
type: ‘POST’,
url: baseDir + ‘cart.php’,
async: true,
cache: false,
dataType : «json»,
data: ‘add=1&ajax=true&qty=’ + ((quantity && quantity != null) ? quantity : ‘1’) + ‘&id_product=’ + idProduct + ‘&token=’ + static_token + ( (parseInt(idCombination) && idCombination != null) ? ‘&ipa=’ + parseInt(idCombination): »),
success: function(jsonData,textStatus,jqXHR)
{
….
….
….

});[/shell]
Well, tracing the code using phpfire I could see that requests are sent in this order :

1.- blockcart-set-collapse.php

2.- cart.php

In cases that works fine I got the return of the request in same order, but when cart gets empty, I reicived cart.php firt and then blockcart-set-collapse.php

This means that blockcart-set-collapse.php is requested without id_cart cookie value, so return a cookie without id_cart.

So id_cart is generated in cart.php call, and blockcart-set-collapse.php returns the cookie after cart.php, so the id_cart is not preserved because is being overwritted.

There are few ways to fix this :

1.- At ajaxCart.add() disable this.expand() , avoid to made ajax call

2.- at ajaxCart.expand() put ajax request before slideDown() call

3.- The second point and made ajaxcall syncronious setting async : false

[shell]$.ajax({
type: ‘GET’,
url: baseDir + ‘modules/blockcart/blockcart-set-collapse.php’,
async: false,
data: ‘ajax_blockcart_display=expand’ + ‘&rand=’ + new Date().getTime()
});[/shell]
Another way to fix this, is to have ever a id_cart at cookie.

I’m not sure but I think at previous prestashop ( 1.3.x) id_cart was stored at cookie in the first request.

At Prestashop 1.4.x cart is generated at FrontControllerCore::init() but not saved even asigned to the cookie.

Reviewing the code quickly, I see that the id_cart is asigned when a product is added to the cart.

So another solution could be to store a cart in cookies ever.

I hope this could help you to fix your shops !

I continue investigating this issue

PounStudio Team !