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I found a few reason why using drop-down menu for product quantity instead of text field could be better (product_info.php and shopping_cart.php files):

1. With tracking inventory, it’s possible to setup a max number of products that could be added to the shopping cart
2. It’s easy to set a default value other than 1. For the parts store there is always required number of parts per assembly

function tep_select_quantity(
  $name = 'quantity',
  $start = '1', $end = MAX_QTY_IN_CART,
  $selected = 0, $param ='' ) {

  for( $i = $start; $i <= $end; ++$i ) {
    $quantity[] = array('id'   => $i, 'text' => ' ' . $i . ' ');
  }
  return tep_draw_pull_down_menu (
    $name, $quantity, $selected, "class=\"{$name}\" {$param}");
}

• The method could be used with default values for most cases.
• For the shopping cart page, as a parameter, we can pass a JavaScript  as follows: onchange=”document.forms['cart_quantity'].submit ();”

With adding an additional link Remove, we don’t need Update’ button any longer. Check the web site to see this modification in action