How to Add Product With Custom Option to Cart Programmatically in Magento 2

In this code snippet, we will see how we can add a product to cart along with custom options. For that, we will create one controller file, In that file, we will define execute method. In this method using cart model, we will add a product to cart.

Create Controller

In your custom module create a controller file Post.php under app/code/Codextblog/Customcart/Controller/Index directory

namespace CodextblogCustomcartControllerIndex;
 
use MagentoFrameworkAppActionContext;

use MagentoFrameworkEventObserverInterface;
use MagentoFrameworkAppRequestInterface;
 
class Post extends MagentoFrameworkAppActionAction
{
    protected $_resultPageFactory;
    protected $_cart;
    protected $_productRepositoryInterface;
    protected $_url;
    protected $_responseFactory;
    protected $_logger;


    public function __construct(
        Context $context,
        MagentoFrameworkViewResultPageFactory $resultPageFactory,
        MagentoCheckoutModelCart $cart,
        MagentoCatalogApiProductRepositoryInterface $productRepositoryInterface,
        MagentoFrameworkAppResponseFactory $responseFactory,
        PsrLogLoggerInterface $logger
        )
    {
        $this->_resultPageFactory = $resultPageFactory;
        $this->_cart = $cart;
        $this->_productRepositoryInterface = $productRepositoryInterface;
        $this->_responseFactory = $responseFactory;
        $this->_url = $context->getUrl();
        $this->_logger = $logger;
        parent::__construct($context);
    }

    public function execute()
    {
       $productid = 111;
       
        $_product = $this->_productRepositoryInterface->getById($productid);
        $options = $_product->getOptions();

        $customoptions = array();
        $customoptions['my_custom_option'] = 'demo';

        $params = array (
            'product' => $_product->getId(),
            'qty' => 1,
            'price' => $_product->getPrice(),
            'options' => $customoptions
        );

       $this->_cart->addProduct($_product, $params);
       $this->_cart->save();

       $this->_redirect('checkout/cart/index'); 
    }

}

Update Minicart

In Magento 2 mini cart is update using knockout js. While adding a product to cart programmatically we need to specify the controller action in sections.xml file so that Magento 2 update the mini cart as well.

create sections.xml file under app/code/Codextblog/Customcart/etc/frontend directory

<?xml version="1.0" encoding="UTF-8"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Customer:etc/sections.xsd">
    <action name="customcart/index/post">
        <section name="cart"/>
    </action>
</config>

That’s it. Using above code we can easily add product to cart programmatically.