Magento : Add product qty box in related product

Question

I have a related product list in product detail page. Default there is not qty box available to edit qty i want to add qty box and also it's qty add to checkout/cart page while add specific qty.

Answer 1

You need to first add qty field in related_product.phtml file then rewrite function public function addAction() in file app/code/core/Mage/Checkout/controllers/CartController.php

in this method related products are added just by their ids as shown below-

$related = $this->getRequest()->getParam('related_product');
/**
 * Check product availability
 */
 if (!$product) {
     $this->_goBack();
     return;
 }

 $cart->addProduct($product, $params);
 if (!empty($related)) {
          $cart->addProductsByIds(explode(',', $related));
 }

and here you need to do something like this- Using Fix Quantity :

if (!empty($related)) {
           foreach (explode(',', $related) as $productId) {
              $rp = Mage::getModel('catalog/product')->load($productId);
              $rparams['qty'] = 2; // desired quantity got from frontend
              $cart->addProduct($rp, $rparams);
           }

               // $cart->addProductsByIds(explode(',', $related));
  }

and here you need to do something like this- Using User Entered Quantity :

if (!empty($related)) {
            foreach (explode(',', $related) as $productId) {                    
                $rp = Mage::getModel('catalog/product')->load($productId);                  
                $rparams['qty'] = $this->getRequest()->getParam('related_qty_'.$productId); // desired quantity got from frontend
                $cart->addProduct($rp, $rparams);
            }
            //$cart->addProductsByIds(explode(',', $related));
        }       

and here 'related_qty_'.$productId is quantity textbox name.

above is a basic idea to achieve goal.

please comment if it does not work.

Answer 2

As per your requirement you have go through below link to achieve your all things.

1. Quantity Field on Related Products Listing
2. Quantity Field on Related Products Cart

I hope it will help to you.