My previous post on adding to the cart with ajax in Magento has generated enough interest – and pointed out enough flaws in my overly complex code – that I’ve decided to put together a simplified version, so here goes:

ajaxAddToCart.zip

Step 1: Create the server side script.
My sample script is called “addToCartTest.php” and I put it in a /scripts folder in the root of my Magento installation.

< ?php
include_once '../app/Mage.php';
Mage::app();

try{
     // usage /scripts/addToCartTest.php?product_id=838&amp;amp;amp;qty=1
     $product_id = '';

     // get query string
     if (!isset($_GET['product_id'])) { $product_id = ''; } else { $product_id = $_GET['product_id']; }
     if (!isset($_GET['qty'])) { $qty = '1'; } else { $qty = $_GET['qty']; }

     $product = Mage::getModel('catalog/product')->load($product_id);

     $session = Mage::getSingleton('core/session', array('name'=>'frontend'));
     $cart = Mage::helper('checkout/cart')->getCart();

     $cart->addProduct($product, $qty);

     $session->setLastAddedProductId($product->getId());
     $session->setCartWasUpdated(true);

     $cart->save();

     $result = "{'result':'success'}";
     echo $result;

} catch (Exception $e) {
     $result = "{'result':'error'";
     $result .= ", 'message': '".$e->getMessage()."'}";
     echo $result;
}

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