On one of our solution we have use a submit button in the cart which updates all orderlines at once.
Normally I guess you would place a small "update" link on each orderline, but our developer have found this somewhere:
<input type="submit" class="cartquantityupdate" value=" ">
The problem is that this only deletes some of the products and does not return "Empty basket" if it was the last products.
Is there anything we have missed here? or is the safest use of "update" to place it on every orderline with:
<a onclick="updateCartLineQuantity('OL7330');" href="javascript:void(0);">Update</a>