How to Integrate Add to Cart Validation in WooCommerce

WooCommerce is a popular eCommerce plugin that enables users to manage their products and checkout process. One of the features of WooCommerce is the ability to add products to the cart from the cart page.  Integrating Add to Cart Validation in WooCommerce based on Attribute Value and Product Quantity from the Cart Page can help prevent customers from accidentally adding items to their cart that they do not actually want. Additionally, this validation can also help ensure that customers are purchasing the correct quantity of items.It is important to know as a woocommerce developer how to Integrate Add to Cart Validation in WooCommerce.

When a user adds a product to their cart, WooCommerce checks to see if the product's attribute value matches one of the accepted values for that attribute on the product page. If it does, WooCommerce will automatically add a quantity field to the product's detail page.

How to Integrate Add to Cart Validation in WooCommerce

If you are using WooCommerce to sell products, there is a good chance that you are using add-to-cart validation. Validation can help ensure that customers complete the checkout process and receive the products they ordered. Unfortunately, validation can be difficult to implement and can become bogged down in detail. In this article, we will discuss how to integrate add-to-cart validation based on attribute value and product quantity from the cart page. We will also provide a sample implementation.

woocommerce_add_to_cart_validation is one type of WooCommerce hook. First we have to know what WooCommerce hooks are. WooCommerce hooks allow theme and plugin developers to extend WooCommerce functionality without editing the core code. WordPress hooks enable developers to enhance WordPress and extend the capabilities of WordPress websites, whereas WooCommerce hooks provide a higher level of shop customization. Add and filter specific data to your WooCommerce store's pages and operations with the help of these tools, which developers can use to do this. WooCommerce hooks are also customizable, so you can create your own customizations without having to copy and paste code from other stores.

Why are WooCommerce Hooks significant?

WooCommerce Hooks are a powerful addition to any WooCommerce theme or plugin developer’s toolkit.

Here are some reasons why WooCommerce Hooks are so important:

1. They make it simple for theme and plugin developers to include custom functionality in their themes and plugins.

2. They make it easy for beginners to learn how to develop WordPress themes and plugins.

3.They provide flexibility and customization options.

The foundation of WooCommerce action woocommerce_add_to_cart_validation

add_filter( 'woocommerce_add_to_cart_validation', 'woocommerce_add_to_cart_validationcustom', 10, 5 );
function woocommerce_add_to_cart_validationcustom( $true, $product_id, $request_quantity, $variation_id, $request_variation ){
	// filter...
	return $true;
}        

Let's understand this woocommerce_add_to_cart_validation with an example.

<?php
add_filter( 'woocommerce_add_to_cart_validation', 'woocommerce_add_to_cart_validationcustom', 10, 5 );
function woocommerce_add_to_cart_validationcustom( $passed, $product_id, $quantity, $variation_id, $variations ) {
	global $woocommerce;
	
	// Set a minimum item quantity
	$minimum = 10; 
		
	// Check if the quantity is less then our minimum
	if ( $quantity <= $minimum){
     wc_add_notice( sprintf( __( "This is my custom error", "your-theme-language" ) ) ,'error' );  
	  return false;
	} else {
		return true;
	}
}    

Then, from the Cart Page, add Attribute Value and Product Quantity.

Let us understand one by one. The primary arguments are 

$true: indicates whether the validation is true or false.

$product_id:  The product ID that has been requested to be added to the cart will be returned.

$request_quantity: Request quantity to obtain product quantity

$variation_id: Get variation id if it's available.

$passed: By default, $passed returns true.

$quantity: The current number of items you want to add to your cart.

$passed_validation: True if the item passed validation.

Here is the code: Which is an explanation via comment tags added.

function filter_woocommerce_add_to_cart_validation( $passed, $product_id, $quantity, $variation_id = null, $variations = null ) {
    // Get product object
    $product = wc_get_product( $product_id );
    
    // Flag
    $flag = false;
    
    // Is a WC product
    if ( is_a( $product, 'WC_Product' ) ) {
        // Get the product attribute value
        $max_qty = $product->get_attribute( 'quantite_max' );
        
        // NOT empty
        if ( ! empty( $max_qty ) ) {
            // If new added quantity greater than max quantity
            if ( $quantity > $max_qty ) {
                $flag = true;
            // WC Cart NOT null & Cart is NOT empty
            } elseif ( ! is_null( WC()->cart ) && ! WC()->cart->is_empty() ) {
                // Get cart items quantities
                $cart_item_quantities = WC()->cart->get_cart_item_quantities();
                
                // Product quantity in cart
                $product_qty_in_cart = isset( $cart_item_quantities[ $product_id ] ) ? $cart_item_quantities[ $product_id ] : null;
                
                // New added quantity + product quantity in cart greater than max quantity
                if ( ( $quantity + $product_qty_in_cart ) > $max_qty ) {
                    $flag = true;
                }
            }
        }
    }
    
    // True
    if ( $flag ) {
        wc_add_notice( sprintf( __( 'Cant have more than %s x %s in cart', 'woocommerce' ), $max_qty, $product->get_name() ), 'error' );
        $passed = false;
    }
    
    return $passed;
}
add_filter( 'woocommerce_add_to_cart_validation', 'filter_woocommerce_add_to_cart_validation', 10, 5 );

This way, you can easily understand how to work with the woocommerce_add_to_cart_validation action and set a limit for adding to the cart for some product ids based on product attribute.

Conclusion

By following the steps in this article, you can successfully integrate Add to Cart validation in WooCommerce based on attribute value and product quantity from the cart page. It is a great way to ensure that customers are only adding the products they want to their carts. This can help to improve the customer experience and increase sales. This will help to reduce the chances of abandoned carts. By following the steps in this article, you can easily add this functionality to your WooCommerce store from the Cart Page.