Adding a 'Delivery Type' select field to shopping cart
I am trying to add a select field to the cart.php page so the user can select: collect from shop, local delivery or international. I am using Paypal Express so the user goes straight to Paypal once they click 'checkout' on the cart.php page so they don't add their shipping address within the cart. I have added a select field 'DeliveryType' to the page (just above the discount summery row). I have also added a column to the ecart object (I presume that is correct). I am stuck as to what to do from here.
I have created some shipping rules - dependent on the Session variable DeliveryType, but these don't seem to be working.
How do I get the shopping cart to update once a selection has been made? Is there a way to update the shopping cart automatically once the user selects a value?
I am obviously missing something. I have seen similar issues within this forum but none that directly help me.