woocommerce offtopic - update cart after quantity change or a specific product

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I created this function in functions.php, and it does trigger the default quantity for a specific product. But it does not update the cart for this product for the subtotal to change, reflecting the quantity and total price.

add_filter( 'woocommerce_quantity_input_args', 'jk_woocommerce_quantity_input_args', 10, 2 );
function jk_woocommerce_quantity_input_args( $args, $product ) {
//var_dump($product->get_sku());
    if ( is_cart() && str_starts_with( $product->get_sku(), "TC" ) || is_checkout() && str_starts_with( $product->get_sku(), "TC" ) ){
        $WC_Cart = new WC_Cart();
        //$WC_Cart->set_quantity( $product->get_id(), 36, true );       
var_dump($product->get_id());
        $args['input_value'] = 36; // Start from this value (default = 1) 
        $args['min_value']   = 36; // Minimum value
        //$args['step']        = 36; // Quantity steps
        //WC()->cart->set_quantity( $product->get_id(),36 );        
return $args;
    }else{
        $args['input_value'] = 1;
        $args['min_value'] = 1;
        return $args;
        }
}

How can I run a cart update in my functions.php?

Closed. This question is off-topic. It is not currently accepting answers.

---

Your question should be specific to WordPress. Generic PHP/JS/SQL/HTML/CSS questions might be better asked at Stack Overflow or another appropriate Stack Exchange network site. Third-party plugins and themes are off-topic for this site; they are better asked about at their developers' support routes.

Closed 16 mins ago.

Improve this question

I created this function in functions.php, and it does trigger the default quantity for a specific product. But it does not update the cart for this product for the subtotal to change, reflecting the quantity and total price.

add_filter( 'woocommerce_quantity_input_args', 'jk_woocommerce_quantity_input_args', 10, 2 );
function jk_woocommerce_quantity_input_args( $args, $product ) {
//var_dump($product->get_sku());
    if ( is_cart() && str_starts_with( $product->get_sku(), "TC" ) || is_checkout() && str_starts_with( $product->get_sku(), "TC" ) ){
        $WC_Cart = new WC_Cart();
        //$WC_Cart->set_quantity( $product->get_id(), 36, true );       
var_dump($product->get_id());
        $args['input_value'] = 36; // Start from this value (default = 1) 
        $args['min_value']   = 36; // Minimum value
        //$args['step']        = 36; // Quantity steps
        //WC()->cart->set_quantity( $product->get_id(),36 );        
return $args;
    }else{
        $args['input_value'] = 1;
        $args['min_value'] = 1;
        return $args;
        }
}

How can I run a cart update in my functions.php?

• woocommerce-offtopic

Share Improve this question edited Apr 23 at 6:23 Ali Khakbaz 10322 bronze badges asked Apr 19 at 15:41 gstlouisgstlouis 1111 silver badge66 bronze badges

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1 Answer 1

Sorted by: Reset to default 0

you need to hook into a WooCommerce action before the cart totals are calculated and set the quantity there.

add_action(
'woocommerce_before_calculate_totals',
static function (\WC_Cart $cart) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) ) {
        return;
    }

    if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 ) {
        return;
    }

    foreach ( $cart->get_cart() as $cart_item_key => $cart_item ) {
        $product = $cart_item['data'];

        if ( str_starts_with( $product->get_sku(), 'TC' ) && $cart_item['quantity'] < 36 ) {
            $cart->set_quantity( $cart_item_key, 36 );
        }
    }
});

Your woocommerce_quantity_input_args filter is fine for the UI input.

add_filter(
'woocommerce_quantity_input_args',
static function (array $args, $product): array {
    if ( ( is_cart() || is_checkout() ) && str_starts_with( $product->get_sku(), 'TC' ) ) {
        $args['input_value'] = 36; // Default quantity
        $args['min_value']   = 36; // Minimum allowed
    }

    return $args;
},
10,
2);