Magento 2: Add Quantity 2 When Add To Cart From Product View Page

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Introduction

Magento 2 is a powerful e-commerce platform that offers a wide range of features and functionalities to create a seamless shopping experience for customers. One of the key features of Magento 2 is its ability to handle complex product configurations and cart management. However, sometimes, even with the best of intentions, things don't go as planned. In this article, we will discuss a common issue that many Magento 2 developers face - adding quantity 2 when adding to cart from the product view page.

The Issue

When a customer adds a product to their cart from the product view page, Magento 2 makes a post request to the server to update the cart. However, in some cases, this post request is made twice, resulting in the quantity of the product being added twice to the cart. This can lead to incorrect cart totals and a poor customer experience.

Why Does This Happen?

There are several reasons why this issue might occur. One possible reason is that the product view page is making a post request to the server to update the cart, and then the cart is being updated again when the customer clicks the "Add to Cart" button. This can happen if the product view page is not properly configured or if there are any issues with the cart management module.

Solution

To fix this issue, we need to modify the product view page to prevent it from making a post request to the server when the customer clicks the "Add to Cart" button. We can do this by adding a check to see if the product is already in the cart before making the post request.

Step 1: Create a Custom Module

To fix this issue, we need to create a custom module that will modify the product view page to prevent it from making a post request to the server when the customer clicks the "Add to Cart" button. We can create a new module by running the following command:

php bin/magento module:create --module-name=Vendor_Module

Step 2: Create a Custom Controller

Next, we need to create a custom controller that will modify the product view page to prevent it from making a post request to the server when the customer clicks the "Add to Cart" button. We can create a new controller by running the following command:

php bin/magento module:controller:install --module-name=Vendor_Module

Step 3: Modify the Product View Page

Now that we have created a custom module and controller, we need to modify the product view page to prevent it from making a post request to the server when the customer clicks the "Add to Cart" button. We can do this by adding a check to see if the product is already in the cart before making the post request.

// File: app/code/Vendor/Module/Controller/Product/View.php

namespace Vendor\Module\Controller\Product;


use Magento\Catalog\Controller\Product\View;
use Magento\Checkout\Model\Cart;


class View extends View
{
protected $cart;


public function __construct(
    Context $context,
    Cart $cart
) {
    $this->cart = $cart;
    parent::__construct($context);
}

public function execute()
{
    // Check if the product is already in the cart
    if ($this->cart->getQuote()->hasItem($this->getRequest()->getParam('product_id'))) {
        // If the product is already in the cart, do not make a post request
        return $this->resultRedirectFactory->create()->setUrl($this->_redirect->getRefererUrl());
    }

    // If the product is not in the cart, make a post request to add it
    $this->getRequest()->setMethod('post');
    $this->getRequest()->setPostValue('qty', 2);
    $this->getRequest()->setPostValue('product', $this->getRequest()->getParam('product_id'));

    // Make a post request to add the product to the cart
    $this->cart->addProduct($this->getRequest()->getParam('product_id'), 2);

    // Redirect the customer to the cart page
    return $this->resultRedirectFactory->create()->setUrl($this->_redirect->getCartUrl());
}



}

Step 4: Add a Custom Event

To fix this issue, we also need to add a custom event that will prevent the product view page from making a post request to the server when the customer clicks the "Add to Cart" button. We can add a custom event by creating a new file in the etc/events.xml directory of our custom module.

<!-- File: app/code/Vendor/Module/etc/events.xml -->

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance&quot;
xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
<event name="checkout_cart_add_product_after">
<observer name="vendor_module_checkout_cart_add_product_after"
instance="Vendor\Module\Observer\CheckoutCartAddProductAfter"/>
</event>
</config>

Step 5: Create a Custom Observer

Next, we need to create a custom observer that will prevent the product view page from making a post request to the server when the customer clicks the "Add to Cart" button. We can create a new observer by creating a new file in the etc/observers.xml directory of our custom module.

// File: app/code/Vendor/Module/etc/observers.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance&quot;
xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
<event name="checkout_cart_add_product_after">
<observer name="vendor_module_checkout_cart_add_product_after"
instance="Vendor\Module\Observer\CheckoutCartAddProductAfter"/>
</event>
</config>

Step 6: Modify the Observer

Now that we have created a custom observer, we need to modify it to prevent the product view page from making a post request to the server when the customer clicks the "Add to Cart" button. We can do this by adding a check to see if the product is already in the cart before making the post request.

// File: app/code/Vendor/Module/Observer/CheckoutCartAddProductAfter.php

namespace Vendor\Module\Observer;


use Magento\Checkout\Model\Cart;


class CheckoutCartAddProductAfter
{
protected $cart;


public function __construct(
    Cart $cart
) {
    $this-&gt;cart = $cart;
}

public function execute(\Magento\Framework\Event\Observer $observer)
{
    // Check if the product is already in the cart
    if ($this-&gt;cart-&gt;getQuote()-&gt;hasItem($observer-&gt;getProduct()-&gt;getId())) {
        // If the product is already in the cart, do not make a post request
        return;
    }

    // If the product is not in the cart, make a post request to add it
    $this-&gt;cart-&gt;addProduct($observer-&gt;getProduct()-&gt;getId(), 2);
}



}

Conclusion

Introduction

In our previous article, we discussed a common issue that many Magento 2 developers face - adding quantity 2 when adding to cart from the product view page. We also provided a step-by-step solution to fix this issue by creating a custom module, controller, and observer. In this article, we will answer some frequently asked questions related to this issue.

Q: What is the cause of this issue?

A: The cause of this issue is that the product view page is making a post request to the server to update the cart, and then the cart is being updated again when the customer clicks the "Add to Cart" button. This can happen if the product view page is not properly configured or if there are any issues with the cart management module.

Q: How can I prevent this issue from occurring?

A: To prevent this issue from occurring, you can create a custom module that will modify the product view page to prevent it from making a post request to the server when the customer clicks the "Add to Cart" button. You can also add a custom event that will prevent the product view page from making a post request to the server when the customer clicks the "Add to Cart" button.

Q: What are the steps to create a custom module to prevent this issue?

A: To create a custom module to prevent this issue, you will need to follow these steps:

  1. Create a new module by running the following command: php bin/magento module:create --module-name=Vendor_Module
  2. Create a new controller by running the following command: php bin/magento module:controller:install --module-name=Vendor_Module
  3. Modify the product view page to prevent it from making a post request to the server when the customer clicks the "Add to Cart" button.
  4. Add a custom event that will prevent the product view page from making a post request to the server when the customer clicks the "Add to Cart" button.

Q: What are the benefits of creating a custom module to prevent this issue?

A: The benefits of creating a custom module to prevent this issue include:

  • Preventing the product view page from making a post request to the server when the customer clicks the "Add to Cart" button, resulting in a more seamless and efficient shopping experience for your customers.
  • Reducing the risk of cart errors and inconsistencies.
  • Improving the overall performance and reliability of your Magento 2 store.

Q: Can I use a third-party extension to prevent this issue?

A: Yes, you can use a third-party extension to prevent this issue. However, be sure to carefully review the extension's documentation and reviews to ensure that it meets your needs and is compatible with your Magento 2 store.

Q: How can I troubleshoot this issue if it occurs?

A: To troubleshoot this issue, you can follow these steps:

  1. Check the Magento 2 logs to see if there are any errors or warnings related to the cart management module.
  2. Check the product view page to see if it is making a post request to the server when the customer clicks the "Add to Cart" button.
  3. Check the cart management module to see if it is updating the cart correctly.
  4. Contact your Magento 2 developer or support team for further assistance.

Conclusion

In this article, we answered some frequently asked questions related to the issue of adding quantity 2 when adding to cart from the product view page in Magento 2. We also provided some tips and best practices for preventing and troubleshooting this issue. By following these tips and best practices, you can ensure that your Magento 2 store is running smoothly and efficiently, and that your customers have a seamless and enjoyable shopping experience.