One-Page Checkout [Support Thread]

[lat9]

FWIW, I'm up to OPC v2.1.0-beta8.

You'll need to edit (and make a copy of) /includes/classes/OnePageCheckout.php to edit its formatAddressBookDropdown method:

    
    public function formatAddressBookDropdown()
    {
        $select_array = array();
        if (isset($_SESSION['customer_id']) && !$this->isGuestCheckout() && !$this->customerAccountNeedsPrimaryAddress()) {
            // -----
            // Build up address list input to create a customer-specific selection list of 
            // pre-existing addresses from which to choose.
            //
            $addresses = $GLOBALS['db']->Execute(
                "SELECT address_book_id 
                   FROM " . TABLE_ADDRESS_BOOK . " 
                  WHERE customers_id = " . (int)$_SESSION['customer_id'] . "
               ORDER BY address_book_id"
            );
            if (!$addresses->EOF) {
                $select_array[] = array(
                    'id' => 0,
                    'text' => TEXT_SELECT_FROM_SAVED_ADDRESSES
                );
            }
            while (!$addresses->EOF) {
                $select_array[] = array( 
                    'id' => $addresses->fields['address_book_id'],
                    'text' => str_replace("\n", ', ', zen_address_label($_SESSION['customer_id'], $addresses->fields['address_book_id']))
                );
                $addresses->MoveNext();
            }
        }
        return $select_array;
    }

Note, though, that this class is very 'volatile' as it's the heart of OPC's processing.