I want to be able to add shipping (i.e. update form field) if the zip code entered (also another form field) is not one of the zip codes that we ship too.
For example, if zip code = 91709 or 91710 or 91711, then the shipping should remain 0. If it is something else then shipping should be updated $25.
I've looked at http://pastie.org/1487205 and I understand how zip code validation works... but how do I update shipping once zip code has been entered?
Thanks.
BTW GF Rocks!