Automatically remove Out of Stock products from the Prestashop Cart

In this video tutorial we will see how to automatically remove out of stock products from the Prestashop cart, and display a message about it as well.

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Steps Breakdown

File: modules/blockcart/blockcart.php

Around line 64, change:

		$nbTotalProducts = 0;
		foreach ($products as $pk => $product)
		{
			$nbTotalProducts += (int)$product['cart_quantity'];
		}

To

		$nbTotalProducts = 0;
		$removed = array();
		foreach ($products as $pk => $product)
		{
			if($product['quantity_available'] <= 0 && !Product::isAvailableWhenOutOfStock($product['out_of_stock']))
			{
				$this->context->cart->deleteProduct($product['id_product'],$product['id_product_attribute'], $product['id_customization'], $product['id_address_delivery']);
				$removed[] = $product['name'];
				unset($product[$pk]);
				continue;
			}
			$nbTotalProducts += (int)$product['cart_quantity'];
		}

Around line 133, add the following to the Smarty assign:

			'removed_products' => $removed,
			'cart_qties' => (int)$this->context->cart->nbProducts(),

File: themes/default-bootstrap/modules/blockcart/blockcart.tpl
Add the following at the very beginning

<script>
{if $removed_products}
	var removed_products = new Array();
	{foreach from=$removed_products item=prd}
		removed_products.push('{$prd}');
	{/foreach}
	var products_string = removed_products.join(', ');
	alert("{l s='The following products have been removed from your cart as they are out of stock:' mod='blockcart'}" + products_string);
{/if}
</script>