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Resolved

(@armedandgorgeous)

Hi,

On my website I am adding a free product to the cart if items are above a certain amount. Here is my code:

add_action( 'woocommerce_before_calculate_totals', 'add_free_product_to_cart' );
function add_free_product_to_cart( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    $free_product_id = 39568 ; // <= Set the free product id to add
    $min_subtotal    = 40; // <= Set the minimum cart subtotal required

    $has_shippable   = $free_key = false; // Initializing
    $cart_subtotal   = 0;

	
	
    // Loop through cart items (first loop)
    foreach ( $cart->get_cart() as $cart_item_key => $cart_item ){
        // Check if free product is in cart
        if ( $free_product_id == $cart_item['product_id'] ) {
            $free_key = $cart_item_key;
            $free_qty = $cart_item['quantity'];
            $cart_item['data']->set_price(0); // Optional: Set free product price to zero
        }

        // Check for non virtual products
        if ( $cart_item['data']->is_virtual() !== true ) {
            $has_shippable = true;
        }
        // Calculate items subtotal: Add discounted Line total with taxes
        $cart_subtotal += $cart_item['line_total'] + $cart_item['line_tax'];
    }

    // Add Free product
    if ( $cart_subtotal >= $min_subtotal && $has_shippable && $free_key === false ) {
        $cart->add_to_cart( $free_product_id, 1 );
    }
    // Remove free product
    elseif ( ( $cart_subtotal < $min_subtotal  ) && $free_key !== false ) {
        $cart->remove_cart_item( $free_key );
    }
    // Adjust free product quantity to 1
    elseif ( $free_key !== false && $free_qty > 1 ) {
        $cart->set_quantity( $free_key, 1 );
    }
}

// Optional: Display free product price to zero on minicart
add_filter( 'woocommerce_cart_item_price', 'change_minicart_free_gifted_item_price', 10, 3 );
function change_minicart_free_gifted_item_price( $price_html, $cart_item, $cart_item_key ) {
    $free_product_id   = 39568;

    if( $cart_item['product_id'] == $free_product_id ) {
        return wc_price( 0 );
    }
    return $price_html;
}

It works fine, however it does not have breaker for if the item is not in stock. Recently I’ve been running out of the free item and it doesn’t allow someone to go through the checkout. Ive tried to add this before first if clause:

 global $product;
  $stock = $product->get_stock_quantity();

  if ( $_product->is_in_stock()

but it keeps giving me an error. I am a novice with coding so if someone could help me out that would be great! I just essentially don’t want the free product to add to cart if stock is 0.

Thanks,
Otis

The page I need help with: [log in to see the link]

Viewing 3 replies - 1 through 3 (of 3 total)

Plugin Support

Daniyal Ahmed (a11n)

(@daniyalahmedk)

2 years, 9 months ago

Hi there,

This is a fairly complex development topic. I’m going to leave it open for a bit to see if anyone is able to chime in to help you out.

I can also recommend the WooCommerce Developer Resources Portal for resources on developing for WooCommerce.

You can also visit the WooCommerce Facebook group or the #developers channel of the WooCommerce Community Slack. We’re lucky to have a great community of open-source developers for WooCommerce, and many of our developers hang out there, as well.

Best,

Thread Starter

armedandgorgeous

(@armedandgorgeous)

2 years, 9 months ago

For anyone who is reading this in the future this is the working code

add_action( 'woocommerce_before_calculate_totals', 'add_free_product_to_cart' );
function add_free_product_to_cart( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    $free_product_id = 39568 ; // <= Set the free product id to add
    $min_subtotal    = 40; // <= Set the minimum cart subtotal required

    $has_shippable   = $free_key = false; // Initializing
    $cart_subtotal   = 0;

	
	$product = wc_get_product($free_product_id);
	$stock = $product->get_stock_quantity();
	
	if($stock > 0) {
  
	
    // Loop through cart items (first loop)
    foreach ( $cart->get_cart() as $cart_item_key => $cart_item ){
        // Check if free product is in cart
        if ( $free_product_id == $cart_item['product_id'] ) {
            $free_key = $cart_item_key;
            $free_qty = $cart_item['quantity'];
            $cart_item['data']->set_price(0); // Optional: Set free product price to zero
        }

        // Check for non virtual products
        if ( $cart_item['data']->is_virtual() !== true ) {
            $has_shippable = true;
        }
        // Calculate items subtotal: Add discounted Line total with taxes
        $cart_subtotal += $cart_item['line_total'] + $cart_item['line_tax'];
    }

    // Add Free product
    if ( $cart_subtotal >= $min_subtotal && $has_shippable && $free_key === false ) {
        $cart->add_to_cart( $free_product_id, 1 );
    }
    // Remove free product
    elseif ( ( $cart_subtotal < $min_subtotal  ) && $free_key !== false ) {
        $cart->remove_cart_item( $free_key );
    }
    // Adjust free product quantity to 1
    elseif ( $free_key !== false && $free_qty > 1 ) {
        $cart->set_quantity( $free_key, 1 );
    }
}
}

	
// Optional: Display free product price to zero on minicart
add_filter( 'woocommerce_cart_item_price', 'change_minicart_free_gifted_item_price', 10, 3 );
function change_minicart_free_gifted_item_price( $price_html, $cart_item, $cart_item_key ) {
    $free_product_id   = 39568;

	
	$product = wc_get_product($free_product_id);
	$stock = $product->get_stock_quantity();
	
	if($stock > 0) {
	
    if( $cart_item['product_id'] == $free_product_id ) {
        return wc_price( 0 );
    }
    return $price_html;
}
}

Its this that is the stock control breaker :

	$product = wc_get_product($free_product_id);
	$stock = $product->get_stock_quantity();
	
	if($stock > 0) {

Plugin Support

Daniyal Ahmed (a11n)

(@daniyalahmedk)

2 years, 9 months ago

Hi there,

I am glad this has been sorted out. I’ll go ahead and mark this thread as solved now. If you have any questions, please open a new support request at

How can I fetch if in_stock?

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