root/shop/add_to_basket.tt
<form id="add_to_basket" action="[% c.uri_for( '/shop/basket/add-item' ) %]" method="post">
<input type="hidden" name="item_id" value="[% item.id %]">
<input type="hidden" name="return_url" value="[% c.request.uri %]">
<input type="submit" name="add" value="Add to basket">
<input type="text" name="quantity" value="1" class="textnumber">
</form>