Home » WooCommerce: Set Product Discount Percentage @ Product Admin

WooCommerce: Set Product Discount Percentage @ Product Admin

by adminkys

Let’s say you want to apply a 10% discount on a WooCommerce product. Its original price is $79.56. You go to the “Edit Product” page, go to the “Sale Price” input field, and enter ( $79.56 – 10% ) = $71.63. This is great as you can set the sale price, but this forces you to do some math and waste time.

What if there were a custom select dropdown, where you could directly define a fixed discount e.g. 10% or 25%, without having to calculate the final price?

Well, in today’s tutorial, we’ll see how we can display a dropdown in the Product Edit page, and at the same time how to edit the frontend price once a discount value is selected, so that you don’t need to worry about that manual sale price calculation. Enjoy!

With this custom select dropdown, I can define the WooCommerce product sale price by selecting a fixed discount rate, and stop worrying about math!

PHP Snippet: Define Product Discount Via a Custom Dropdown @ WooCommerce Edit Product Page

/**
 * @snippet       Define Product Discount - WooCommerce
 * @how-to        Get tutoraspire.com FREE
 * @author        Tutor Aspire
 * @compatible    WooCommerce 7
 * @donate $9     https://www.tutoraspire.com
 */

add_action( 'woocommerce_product_options_pricing', 'tutoraspire_set_percentage_discount' );

function tutoraspire_set_percentage_discount() {
global $product_object;
woocommerce_wp_select(
array(
'id' => '_pc_discount',
'value' => get_post_meta( $product_object->get_id(), '_pc_discount', true ),
'label' => 'Discount %',
'options' => array(
'0' => '0',
'10' => '10',
'25' => '25',
'50' => '50',
),
)
);
}

add_action( 'save_post_product', 'tutoraspire_save_percentage_discount' );
  
function tutoraspire_save_percentage_discount( $product_id ) {
    global $typenow;
    if ( 'product' === $typenow ) {
        if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) return;
if ( isset( $_POST['_pc_discount'] ) ) {
            update_post_meta( $product_id, '_pc_discount', $_POST['_pc_discount'] );
        }
    }
}
 
add_filter( 'woocommerce_get_price_html', 'tutoraspire_alter_price_display', 9999, 2 );
 
function tutoraspire_alter_price_display( $price_html, $product ) {
    if ( is_admin() ) return $price_html;
    if ( '' === $product->get_price() ) return $price_html;
    if ( get_post_meta( $product->get_id(), '_pc_discount', true ) && get_post_meta( $product->get_id(), '_pc_discount', true ) > 0 ) {
        $orig_price = wc_get_price_to_display( $product );
        $price_html = wc_format_sale_price( $orig_price, $orig_price * ( 100 - get_post_meta( $product->get_id(), '_pc_discount', true ) ) / 100 );
    }
    return $price_html;
}
 
add_action( 'woocommerce_before_calculate_totals', 'tutoraspire_alter_price_cart', 9999 );
 
function tutoraspire_alter_price_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 ( get_post_meta( $product->get_id(), '_pc_discount', true ) && get_post_meta( $product->get_id(), '_pc_discount', true ) > 0 ) {
        $price = $product->get_price();
        $cart_item['data']->set_price( $price * ( 100 - get_post_meta( $product->get_id(), '_pc_discount', true ) ) / 100 );
}
    }
}

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