Do you want to provide free shipping only for on-sale products?
This code shows a free shipping notice for products on sale, hides other shipping options, and only displays free shipping on both the cart and checkout pages.
function ts_filter_woocommerce_shipping_free_shipping_is_available( $is_available, $package, $shipping_method ) {
// Loop through cart items
foreach ( $package['contents'] as $cart_item ) {
// On sale
if ( $cart_item['data']->is_on_sale() ) {
// True
$is_available = true;
// Notice
$notice = __( 'Free shipping is enabled for products on sale.', 'woocommerce' );
// Break loop
break;
}
}
// Display notice
if ( isset( $notice ) ) {
wc_add_notice( $notice, 'notice' );
}
return $is_available;
}
// Hide other shipping methods when free shipping is available
function ts_hide_shipping_when_free_is_available( $rates ) {
$free = array();
foreach ( $rates as $rate_id => $rate ) {
if ( 'free_shipping' === $rate->get_method_id() ) {
$free[ $rate_id ] = $rate;
}
}
return ! empty( $free ) ? $free : $rates;
}
add_filter( 'woocommerce_package_rates', 'ts_hide_shipping_when_free_is_available', 100 );
add_filter( 'woocommerce_shipping_free_shipping_is_available', 'ts_filter_woocommerce_shipping_free_shipping_is_available', 10, 3 );
Output
Let’s assume that a customer adds an on-sale product to the cart.
When the customer views the cart, the code will display a free shipping notice message only for on-sale products. Also, it hides other shipping options, leaving only free shipping available.
On-sale products are also a sort of providing discounts for products. Similar to this customization, you can also enable the shipping method when a coupon is applied in WooCommerce.
