error message - Impossible to add products to cart

[benofino]

My online store had been working fine until 2 weeks ago.
I have install 1.2.4.0
and impossible to add products to cart
TECHNICAL ERROR: unable to add the product.

Details:
Error thrown: [object XMLHttpRequest]
Text status: error

What can be done?

ben

[codegrunt]

The error means that the Javascript retrieving cart information from Prestashop ran into issues parsing the response that came back from the server. This could be for any number of reasons - your browser is doing something funny, there is product data with unescaped characters causing problems, something messed up with the JSON generation code on the server, extra text getting prepended or appended to the output, etc.

The first thing I would suggest is that you disable Javascript in your browser temporarily and see if you can add products normally. If that works fine, then the issue has got to be related to Javascript either on your machine or in the output coming back from the server.

You can manually inspect what is being sent by calling the cart directly by calling the cart directly. If you view the source to your product page you will find a section like this:

<input type="hidden" name="token" value="00757d49336c884062383c23" />
<input type="hidden" name="id_product" value="1" id="product_page_product_id" />
<input type="hidden" name="add" value="1" />
<input type="hidden" name="id_product_attribute" id="idCombination" value="" />

Plug your token and id_product values in to the following URL:

http://www.prestashop.com/demo/cart.php?add&ajax=true&qty=1&id_product=1&token=00757d49336c884062383c23

You would replace everything up to "cart.php" with the URL to your shop, your product id instead of "1" and your token value instead of "00757d49336c884062383c23". If you access this URL in your browser, you should be given some text representing a JSON object (Javascript representing your cart contents) which should look something like this:

{
'products': [
   {
       'id':            2,
       'link':          'http://www.prestashop.com/demo/music-ipods/2-ipod-shuffle.html',
       'quantity':      2,
       'priceByLine':   '158,00 €',
       'name':          'iPod shuffle',
       'price':         '158,00 €',
       'idCombination': 8,
       'hasAttributes': true,
       'attributes':    'Green',
       'hasCustomizedDatas': false,

       'customizedDatas':[
               ]


   },
   {
       'id':            1,
       'link':          'http://www.prestashop.com/demo/music-ipods/1-ipod-nano.html',
       'quantity':      4,
       'priceByLine':   '756,20 €',
       'name':          'iPod Nano',
       'price':         '756,20 €',
       'idCombination': 31,
       'hasAttributes': true,
       'attributes':    'Black, 16Go',
       'hasCustomizedDatas': false,

       'customizedDatas':[
               ]


   },
],

'discounts': [
],

'shippingCost': '0,00 €',
'wrappingCost': '0,00 €',
'nbTotalProducts': '6',
'total': '914,20 €',
'productTotal': '914,20 €',

'hasError' : false

}

My guesses here are:

1. there will be an error message or extraneous HTML embedded in the array returned making it unparseable (track down the source of the error)

2. a product has text in it that is breaking the array due to lack of proper escaping (change the product details)

3. your browser has a taskbar or something similar installed that is messing with its Javascript behaviour

Cheers

[andyr73]

There is also a problem in which i found that if you don't have a default carrier setup in presta back end you will also get that problem with parse error and when you click view cart you get a hack attempt error. maybe this will help?
cheers

[anafor]

I've found the solution!)) Thanks you very much, codegrunt!
I've tried to enter url in browser as you told: "cart.php?add&ajax=true&qty=1&id_product=1&token=c111e173641a40c51b739ca280ac2fe7". And I've found the reason: there was a mysql warning (my "display_errors" in config.inc.php had been turned to "on") like

Warning: Unknown: 1 result set(s) not freed. Use mysql_free_result to free result sets which were requested using mysql_query() in Unknown on line 0

in the end of json response cart.php returned.
I've just turned display_errors to "off" and everything works fine!

Does anybody know how to remove this warning at all, even if display_errors turned on?

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