Antwort auf: Benutzerdefiniertes Produktfeld

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// Display the custom note field in the cart
function display_custom_note_field_in_cart() {
    echo '<tr class="custom-order-note">
        <th>' . __('Order Note', 'woocommerce') . '</th>
        <td><textarea name="custom_order_note" class="input-text"></textarea></td>
    </tr>';
}
add_action('woocommerce_cart_totals_before_order_total', 'display_custom_note_field_in_cart');

// Display the saved custom note value in the cart
function display_saved_custom_note_in_cart() {
    if (WC()->session->__isset('custom_order_note')) {
        echo '<tr class="custom-order-note">
            <th>' . __('Order Note', 'woocommerce') . '</th>
            <td>' . esc_html(WC()->session->get('custom_order_note')) . '</td>
        </tr>';
    }
}
add_action('woocommerce_cart_totals_after_order_total', 'display_saved_custom_note_in_cart');

// Display the custom note field in the checkout
function display_custom_note_field_in_checkout() {
    echo '<div id="custom-order-note-field" class="woocommerce-additional-fields">
        <h3>' . __('Order Note', 'woocommerce') . '</h3>
        <textarea name="custom_order_note" class="input-text"></textarea>
    </div>';
}
add_action('woocommerce_before_order_notes', 'display_custom_note_field_in_checkout');

// Save the custom note field value to the session
function save_custom_note_field_to_session() {
    if (isset($_POST['custom_order_note'])) {
        WC()->session->set('custom_order_note', sanitize_text_field($_POST['custom_order_note']));
    }
}
add_action('woocommerce_cart_calculate_fees', 'save_custom_note_field_to_session');

// Save the custom note field as an order note
function save_custom_note_field_to_order($order_id) {
    if (WC()->session->__isset('custom_order_note')) {
        $order = wc_get_order($order_id);
        $note = sanitize_text_field(WC()->session->get('custom_order_note'));
        $order->add_order_note($note);
    }
}
add_action('woocommerce_checkout_create_order', 'save_custom_note_field_to_order');

Vielleicht hilft dir dieser Code. Kommt vom ChatGPT, sieht aber ganz brauchbar aus auf den ersten Blick

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