Add Product in Cart Programmatically from observers, blocks, helper, plugin etc

Add Product in Cart Programmatically from observers, blocks, helper, plugin etc.

There are just few lines of code to add a product in cart using cart model.

Write the following code in the function of your class of (observer, block, helper, plugin) to add product in cart.

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();

$cart = $objectManager->get(
    'Magento\Checkout\Model\Cart'
);
$productRepo = $objectManager->get(
    'Magento\Catalog\Model\ProductRepository'
);

$productData = [];
$productData['qty'] = PRODUCT_QUANTITY; // input  here for quantity of product, for. e.g : 5
$productData['product'] = PRODUCT_ID; // input product id here, for e.g : 1

$_product = $productRepo->getById(PRODUCT_ID);
if ($_product) {
    $cart->addProduct($_product, $productData); // adds product in cart using cart model
}
$cart->save();
$cart->getQuote()->setTotalsCollectedFlag(false)->collectTotals();
$cart->getQuote()->save();