How add custom field in cart and sent in the order

I have one question about shopping. I need aggregate one field Giftwrapped your order? Yes No. name=giftwrap id=giftwrap value=functionevalue(Radio) this validation is javascript and function, no problem with this. Now i have take the value giftwrap and send to group ajax 开发者_如何学Pythonand show this value in checkout review before confirm order, and then send the comment: the gift should be wrapped in the orden in the backend. I try, i search but no nothing functioned, please help.

Take a look at this Order Attributes extensions. It does exactly what you want for a relative cheap cost.