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Dealing with digital products, I've added a GIFT function which works fine, but it does not work if the custom GIFT field is not filled in. If the GIFT field is filled in and when the order is set to Complete, the order complete email is sent to the email put in the GIFT field instead of the one entered as the billing email.

Any idea for where I'm going wrong here? I need it to send to the billing email if the GIFT field is not filled in and if the GIFT field is filled in, send only to the email entered in the GIFT field.

Here is the code:

// add gift message on checkout

add_action( 'woocommerce_after_order_notes', 'custom_checkout_field_before_billing' );

function custom_checkout_field_before_billing() {

    $domain = 'woocommerce';



    ?>

    <style>p#gift_field{display:none;}</style>

    <div id="message">

    <h3><i class="fa fa-gift"></i><?php _e( ' Is this a gift?', 'woocommerce' ); ?></h3>

    <?php



    woocommerce_form_field( 'gift_msg', array(

        'type'  => 'checkbox',

        'class' => array( 'gift-checkbox' ),

        'label' => __( 'To whom is this a gift?', 'woocommerce' ),

    ), WC()->checkout->get_value( 'cb_msg' ));



    woocommerce_form_field( 'gift', array(

        'type'              => 'text',

        'class'             => array('msg t_msg'),

        'label'             => __('Enter the recipient's e-mail address, e.g: john.smith@email.com '),

        'placeholder'       => __(''),

    ), WC()->checkout->get_value( 'gift' ));



    echo '</div>';



    ?><script>

    jQuery(document).ready(function($) {

        var a = '#gift_field';

        $('input#gift_msg').change( function(){

            if( $(this).is(':checked') )

                $(a).show();

            else

                $(a).hide();

        });

    });

    </script><?php

}



// add validation if box is checked but field is not filled in

add_action('woocommerce_after_checkout_validation', 'is_this_a_gift_validation', 20, 2 );

function is_this_a_gift_validation( $data, $errors ) {



    if( isset($_POST['gift_msg']) && empty($_POST['gift']) )

        $errors->add( 'gift', __( "You've chosen to send this as a gift, but did not submit a recipient email address.", "woocommerce" ) );

}







// update the gift field meta

add_action( 'woocommerce_checkout_update_order_meta', 'is_this_a_gift_save_meta');

function is_this_a_gift_save_meta( $order_id ) {

    $gift_recipient_address = $_POST['gift'];

    if ( ! empty( $gift_recipient_address ) )

        update_post_meta( $order_id, 'gift', sanitize_text_field( $gift_recipient_address ) );

}





// add gift message to order page

function is_this_a_gift_order_display( $order ) {  ?>

    <div class="order_data_column">

        <h3><?php _e( '<br>Gift For:', 'woocommerce' ); ?></h3>

        <?php 

        echo get_post_meta( $order->id, 'gift', true ); ?>

    </div>

<?php }

add_action( 'woocommerce_admin_order_data_after_order_details', 'is_this_a_gift_order_display' );

Here is the code that does not work as I need it to:

add_filter( 'woocommerce_email_recipient_customer_completed_order', 'is_this_a_gift_replace_email_recipient', 10, 2 );

function is_this_a_gift_replace_email_recipient( $recipient, $order ) {

    if ( ! is_a( $order, 'WC_Order' ) &&  ( ! empty( $gift_recipient_address ))) return $recipient;



    $recipient = get_post_meta( $order->id, 'gift', true );

    return $recipient;

}

I would appreciate some help with this. Thanks in advance!

There are some mistakes in your two last functions… try the following (that will replace your two last functions):

// add gift message to order page

add_action( 'woocommerce_admin_order_data_after_order_details', 'is_this_a_gift_order_display' );

function is_this_a_gift_order_display( $order ) {  



    if( $value = $order->get_meta('gift') ) :

        echo '<div class="order_data_column">

        <h3>' . __( '<br>Gift For:', 'woocommerce' ) . '</h3>

        <p>' . $value . '</p>

        </div>';

    endif;

}



add_filter( 'woocommerce_email_recipient_customer_completed_order', 'is_this_a_gift_replace_email_recipient', 10, 2 );

function is_this_a_gift_replace_email_recipient( $recipient, $order ) {

    $gift_recipient = $order->get_meta('gift');

    if ( is_a( $order, 'WC_Order' ) && $order->get_meta('gift') ) 

        $recipient = $order->get_meta('gift');



    return $recipient;

}

Code goes in function.php file of your active child theme (active theme). It should work.