在Woocommerce中根据产品数量替换特定的购物车项目

Question

I am trying to change the cart content based on the quantity of a product in the cart. I only have 5 products in the shop:

• Product_1 => 1 panel,
• Product_2 => 12 panels,
• Product_3 => 18 panels,
• Product_4 => 30 panels,
• Product_5 => 60 panels,

They are configured as different products, so no bundles, kits or anything. More than one panel products are obviously cheaper than adding a number of single panels separately.

Then I have also a custom product that calculates the number of panels needed based on floor measures given by the customer and then adds to cart the necessary quantity of single panels.

I Would like to change dynamically the content of the cart when it's reviewed.

So for example, if the floor configurator calculate 54 single panels and added them to the cart, I would like to change the cart item to:

• 1 Product_4 (30 panels)
• 1 Product_2 (12 panels)
• 2 Product_1 (1 panel)
• and print a message stating the change.

I've checked different solutions but none of them offer this kind of feature:

• How to bundle products with WooCommerce
• WooCommerce Product Bundles - Bulk Discounts
• WooCommerce Dynamic Pricing & Discounts

So, based on this answer thread, I think I need to use hook woocommerce_before_calculate_totals and implement the logic, but need some help since I am a wordpress dev noob.

Note that the add to cart button is called with Ajax in the floor configurator with:

jQuery("button.ajax_add_to_cart").attr("data-quantity", parseInt(numLozasrealW * numLozasrealH));

Any help is appreciated.

Answer 1

The code bellow should do the trick, It will replace the custom product (quantity) by your other products. You will have to set your custom product ID, your 5 normal product IDs and your custom text notice.

The code:

add_action( 'woocommerce_add_to_cart', 'action_before_cart', 20, 3 );
function action_before_cart( $cart_item_key, $product_id, $quantity ) {
    // HERE set your specific product ID
    $specific_product_id = 862;

    if( $product_id != $specific_product_id ) return;

    // HERE set your other product IDs related to panels
    $products_panels = array(
        861 => 50, // Product ID => for 50 panels
        860 => 30, // Product ID => for 30 panels
        859 => 18, // Product ID => for 18 panels
        858 => 12, // Product ID => for 12 panels
        857 => 1,  // Product ID => for  1 panel
    );

    // Loop through all "panels" products IDs
    foreach ( $products_panels as $product_id => $panels ) {
        if( $quantity >= $panels ){
            $qty = floor($quantity / $panels);
            $quantity = $quantity % $panels;
            $data = 'Panels: '.$panels.' | Quantity: '.$qty.' | Remain: '.$quantity;
            print_pr($data);
            WC()->cart->add_to_cart( $product_id, $qty );
        }
    }
    // Removing the specific product
    WC()->cart->remove_cart_item( $cart_item_key );

    // HERE set your custom notice text
    wc_add_notice('Here your custom notice text', 'notice');
}

Code goes in function.php file of your active child theme (or active theme). Tested and works.

As you can see below when custom product is added to cart, it's replaced by the other products to match the quantity of panels and display a custom notice: