UPDATE 2017/11/02 (Works perfectly in Woocommerce 3+)
Firstly, I have gotten everything working as expected, except getting the value for my_field_name in the back end “Custom fields” Metabox within Order pages.
Then after a real nightmare, I have found a pretty nice working solution, better than before. In the back end you have now a Custom metabox with the custom field my_field_name displaying the right value, like in this screenshot:
My code is divided into 2 parts.
- The backend Metabox in Order pages, with an editable field showing the correct value coming from a custom field on the product pages (in the front end):
// Adding Meta container admin shop_order pages
add_action( 'add_meta_boxes', 'mv_add_meta_boxes' );
if ( ! function_exists( 'mv_add_meta_boxes' ) )
{
function mv_add_meta_boxes()
{
add_meta_box( 'mv_other_fields', __('My Field','woocommerce'), 'mv_add_other_fields_for_packaging', 'shop_order', 'side', 'core' );
}
}
// Adding Meta field in the meta container admin shop_order pages
if ( ! function_exists( 'mv_add_other_fields_for_packaging' ) )
{
function mv_add_other_fields_for_packaging()
{
global $post;
$meta_field_data = get_post_meta( $post->ID, '_my_field_slug', true ) ? get_post_meta( $post->ID, '_my_field_slug', true ) : '';
echo '<input type="hidden" name="mv_other_meta_field_nonce" value="' . wp_create_nonce() . '">
<p style="border-bottom:solid 1px #eee;padding-bottom:13px;">
<input type="text" style="width:250px;" name="my_field_name" placeholder="' . $meta_field_data . '" value="' . $meta_field_data . '"></p>';
}
}
// Save the data of the Meta field
add_action( 'save_post', 'mv_save_wc_order_other_fields', 10, 1 );
if ( ! function_exists( 'mv_save_wc_order_other_fields' ) )
{
function mv_save_wc_order_other_fields( $post_id ) {
// We need to verify this with the proper authorization (security stuff).
// Check if our nonce is set.
if ( ! isset( $_POST[ 'mv_other_meta_field_nonce' ] ) ) {
return $post_id;
}
$nonce = $_REQUEST[ 'mv_other_meta_field_nonce' ];
//Verify that the nonce is valid.
if ( ! wp_verify_nonce( $nonce ) ) {
return $post_id;
}
// If this is an autosave, our form has not been submitted, so we don't want to do anything.
if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
return $post_id;
}
// Check the user's permissions.
if ( 'page' == $_POST[ 'post_type' ] ) {
if ( ! current_user_can( 'edit_page', $post_id ) ) {
return $post_id;
}
} else {
if ( ! current_user_can( 'edit_post', $post_id ) ) {
return $post_id;
}
}
// --- Its safe for us to save the data ! --- //
// Sanitize user input and update the meta field in the database.
update_post_meta( $post_id, '_my_field_slug', $_POST[ 'my_field_name' ] );
}
}
- Front end / Back end:
• The product page custom field (front end).
• Displaying this data on cart, checkout pages and thank you order (front end).
• Displaying data on the order page (back end)
// Add the field to the product
add_action('woocommerce_before_add_to_cart_button', 'my_custom_product_field');
function my_custom_product_field() {
echo '<div id="my_custom_field">
<label>' . __( 'My Field') . ' </label>
<input type="text" name="my_field_name" value="">
</div><br>';
}
// Store custom field
add_filter( 'woocommerce_add_cart_item_data', 'save_my_custom_product_field', 10, 2 );
function save_my_custom_product_field( $cart_item_data, $product_id ) {
if( isset( $_REQUEST['my_field_name'] ) ) {
$cart_item_data[ 'my_field_name' ] = $_REQUEST['my_field_name'];
// below statement make sure every add to cart action as unique line item
$cart_item_data['unique_key'] = md5( microtime().rand() );
WC()->session->set( 'my_order_data', $_REQUEST['my_field_name'] );
}
return $cart_item_data;
}
// Add a hidden field with the correct value to the checkout
add_action( 'woocommerce_after_order_notes', 'my_custom_checkout_field' );
function my_custom_checkout_field( $checkout ) {
$value = WC()->session->get( 'my_order_data' );
echo '<div id="my_custom_checkout_field">
<input type="hidden" class="input-hidden" name="my_field_name" id="my_field_name" value="' . $value . '">
</div>';
}
// Save the order meta with hidden 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_slug', $_POST['my_field_name'] );
}
}
// Display field value on the order edit page (not in custom fields metabox)
add_action( 'woocommerce_admin_order_data_after_billing_address', 'my_custom_checkout_field_display_admin_order_meta', 10, 1 );
function my_custom_checkout_field_display_admin_order_meta($order){
$my_custom_field = get_post_meta( $order->id, '_my_field_slug', true );
if ( ! empty( $my_custom_field ) ) {
echo '<p><strong>'. __("My Field", "woocommerce").':</strong> ' . get_post_meta( $order->id, '_my_field_slug', true ) . '</p>';
}
}
// Render meta on cart and checkout
add_filter( 'woocommerce_get_item_data', 'render_meta_on_cart_and_checkout', 10, 2 );
function render_meta_on_cart_and_checkout( $cart_data, $cart_item = null ) {
$custom_items = array();
if( !empty( $cart_data ) ) $custom_items = $cart_data;
if( isset( $cart_item['my_field_name'] ) )
$custom_items[] = array( "name" => 'My Field', "value" => $cart_item['my_field_name'] );
return $custom_items;
}
// Add the information as meta data so that it can be seen as part of the order
add_action('woocommerce_add_order_item_meta','add_values_to_order_item_meta', 10, 3 );
function add_values_to_order_item_meta( $item_id, $cart_item, $cart_item_key ) {
// lets add the meta data to the order (with a label as key slug)
if( ! empty( $cart_item['my_field_name'] ) )
wc_add_order_item_meta($item_id, __('My field label name'), $cart_item['my_field_name'], true);
}
Everything is working as expected now.