How to add Custom Product Fields in WooCommerce
I followed the guide above and add the code below to my functions.php. That worked fine. My problem is how to I modify this code to save the coupon code $_POST['coupon_code'] entered (during checkout) and save that to the custom field? I am stuck at that point, since my overall goal is to test the coupon code and fill the custom field with the salesperson that promoted that coupon code to the customers.
Thank you for any help!
/**
* Add the field to the checkout
*/
add_action( 'woocommerce_after_order_notes', 'my_custom_checkout_field' );
function my_custom_checkout_field( $checkout ) {
echo '<div id="my_custom_checkout_field"><h2>' . __('My Field') . '</h2>';
woocommerce_form_field( 'my_field_name', array(
'type' => 'text',
'class' => array('my-field-class form-row-wide'),
'label' => __('Fill in this field'),
'placeholder' => __('Enter something'),
), $checkout->get_value( 'my_field_name' ));
echo '</div>';
}
/**
* Update the order meta with field value
*/
add_action( 'woocommerce_checkout_update_order_meta', 'my_custom_checkout_field_update_order_meta' );
function my_custom_checkout_field_update_order_meta( $order_id ) {
if ( ! empty( $_POST['my_field_name'] ) ) {
update_post_meta( $order_id, 'My Field', sanitize_text_field( $_POST['my_field_name'] ) );
}
}
/**
* Display field value on the order edit page
*/
add_action( 'woocommerce_admin_order_data_after_billing_address', 'my_custom_checkout_field_display_admin_order_meta', 10, 1 );
function my_custom_checkout_field_display_admin_order_meta($order){
echo '<p><strong>'.__('My Field').':</strong> ' . get_post_meta( $order->id, 'My Field', true ) . '</p>';
}