I've tested the following changes in "stock" Zen Cart 1.5.1 and Zen Cart 1.5.1 w/ USU (various different settings). Seems to work in my environments to remove the extra "products_id" Zen Cart is currently generating... Could you please try making the following changes to "/includes/modules/product_listing.php" and let me know if it works for you.
Original Code (starting around line #127):
// hide quantity box
if ($listing->fields['products_qty_box_status'] == 0) {
$lc_button = '<a href="' . zen_href_link($_GET['main_page'], zen_get_all_get_params(array('action')) . 'action=buy_now&products_id=' . $listing->fields['products_id']) . '">' . zen_image_button(BUTTON_IMAGE_BUY_NOW, BUTTON_BUY_NOW_ALT, 'class="listingBuyNowButton"') . '</a>';
} else {
$lc_button = TEXT_PRODUCT_LISTING_MULTIPLE_ADD_TO_CART . "<input type=\"text\" name=\"products_id[" . $listing->fields['products_id'] . "]\" value=\"0\" size=\"4\" />";
}
} else {
// qty box with add to cart button
if (PRODUCT_LIST_PRICE_BUY_NOW == '2' && $listing->fields['products_qty_box_status'] != 0) {
$lc_button= zen_draw_form('cart_quantity', zen_href_link($_GET['main_page'], zen_get_all_get_params(array('action')) . 'action=add_product&products_id=' . $listing->fields['products_id']), 'post', 'enctype="multipart/form-data"') . '<input type="text" name="cart_quantity" value="' . (zen_get_buy_now_qty($listing->fields['products_id'])) . '" maxlength="6" size="4" /><br />' . zen_draw_hidden_field('products_id', $listing->fields['products_id']) . zen_image_submit(BUTTON_IMAGE_IN_CART, BUTTON_IN_CART_ALT) . '</form>';
} else {
$lc_button = '<a href="' . zen_href_link($_GET['main_page'], zen_get_all_get_params(array('action')) . 'action=buy_now&products_id=' . $listing->fields['products_id']) . '">' . zen_image_button(BUTTON_IMAGE_BUY_NOW, BUTTON_BUY_NOW_ALT, 'class="listingBuyNowButton"') . '</a>';
}
Patched Code (changes in red):
// hide quantity box
if ($listing->fields['products_qty_box_status'] == 0) {
$lc_button = '<a href="' . zen_href_link($_GET['main_page'], zen_get_all_get_params(array('action', 'products_id')) . 'action=buy_now&products_id=' . $listing->fields['products_id']) . '">' . zen_image_button(BUTTON_IMAGE_BUY_NOW, BUTTON_BUY_NOW_ALT, 'class="listingBuyNowButton"') . '</a>';
} else {
$lc_button = TEXT_PRODUCT_LISTING_MULTIPLE_ADD_TO_CART . "<input type=\"text\" name=\"products_id[" . $listing->fields['products_id'] . "]\" value=\"0\" size=\"4\" />";
}
} else {
// qty box with add to cart button
if (PRODUCT_LIST_PRICE_BUY_NOW == '2' && $listing->fields['products_qty_box_status'] != 0) {
$lc_button= zen_draw_form('cart_quantity', zen_href_link($_GET['main_page'], zen_get_all_get_params(array('action', 'products_id')) . 'action=add_product'), 'post', 'enctype="multipart/form-data"') . '<input type="text" name="cart_quantity" value="' . (zen_get_buy_now_qty($listing->fields['products_id'])) . '" maxlength="6" size="4" /><br />' . zen_draw_hidden_field('products_id', $listing->fields['products_id']) . zen_image_submit(BUTTON_IMAGE_IN_CART, BUTTON_IN_CART_ALT) . '</form>';
} else {
$lc_button = '<a href="' . zen_href_link($_GET['main_page'], zen_get_all_get_params(array('action', 'products_id')) . 'action=buy_now&products_id=' . $listing->fields['products_id']) . '">' . zen_image_button(BUTTON_IMAGE_BUY_NOW, BUTTON_BUY_NOW_ALT, 'class="listingBuyNowButton"') . '</a>';
}
