Add custom field to woocommerce checkout.

Add custom field to woocommerce checkout.

/**
 * Add vehicle registration field to the checkout page
 */
add_action( 'woocommerce_after_order_notes', 'car_registration_checkout_field' );
 
function car_registration_checkout_field( $checkout ) {
 
    echo '<div id="car_registration_checkout_field"><h2>' . __('Car Registration') . '</h2>';
 
    woocommerce_form_field( 'car_registration_no', array(
        'type'          => 'text',
        'class'         => array('my-field-class form-row-wide'),
        'label'         => __('Car Registration'),
        'placeholder'   => __('Please enter your Car Registration No.'),
        'required'      => true,
        ), $checkout->get_value( 'car_registration_no' ));
 
    echo '</div>';
}

/**
 * Process the checkout
 */
add_action('woocommerce_checkout_process', 'car_registration_checkout_field_process');
 
function car_registration_checkout_field_process() {
    // Check if the field is set, if not then show an error message.
    if ( ! $_POST['car_registration_no'] )
        wc_add_notice( __( 'Please enter your Car Registration No.' ), 'error' );
}

/**
 * Update the order meta with field value
 */
add_action( 'woocommerce_checkout_update_order_meta', 'car_registration_checkout_field_update_order_meta' );
 
function car_registration_checkout_field_update_order_meta( $order_id ) {
    if ( ! empty( $_POST['car_registration_no'] ) ) {
        update_post_meta( $order_id, 'Car Registration No', sanitize_text_field( $_POST['car_registration_no'] ) );
    }
}

/**
 * Add the field to order emails
 **/
add_filter( 'woocommerce_email_order_meta_keys', 'car_registration_meta_keys' );

function car_registration_meta_keys() {
	if (get_post_meta( get_the_ID(), 'Car Registration No')) {
		echo 'Car Registration No: ' . get_post_meta( get_the_ID(), 'Car Registration No', true) . '<br />';
	}
}