how to check if product is already in cart

Question

I am creating certain group of products which has one quantity for each product. So, I want to disable the Add to Cart button if that same product is in cart and change the text of the button to Already in Cart. How can I achieve this?? I am using magento 2.2

Any help/suggestion is appreciated. Thank you.

Answer 1

You can use like this in list.phtml:-

$cart = $objectManager->get('\Magento\Checkout\Model\Session')->getQuote();
$result = $cart->getAllVisibleItems();
$itemsIds = array();
foreach ($result as $cartItem) {
    array_push($itemsIds, $cartItem->getProduct()->getId());
}

print_r(in_array($productId, $itemsIds));

As an alternative you can also use Magento default feature:-

For individual settings, go to product details

Click Advanced Inventory

Maximum allowed inventory, and make it 1

Answer 2

You can check product exist or not in Quote by below code.

protected $checkoutSession;

public function __construct(
        \Magento\Checkout\Model\Session $checkoutSession
    )
    {
        $this->checkoutSession = $checkoutSession;
     }

$yourProductId = ''; //Add your product Id here

$this->checkoutSession->getQuote()->hasProductId($yourProductId);

Answer 3

1. You can use the hasProductId function to check if a product is available in the cart or not.
2. You should use the session factory to get the checkout session.

3. Don't use the objectManager directly. Use dependency injection.

   private $checkoutSession;
   
   public function __construct(
       \Magento\Checkout\Model\SessionFactory $checkoutSession
   ) {
       $this->checkoutSession = $checkoutSession;
   }
   
   .....
   .....
   $productId = "1"; // Add your product id
   
   if ($this->checkoutSession->create()->getQuote()->hasProductId($productId)) {
       //product is available in the cart
   }
   

   }