I host a subscription form on my website for my email list (which is managed by MailChimp). On that form, I have a hidden variable that tells me where on the web the signup came from. To achieve this, I actually have many form pages, with a different source constant hard-coded into each form, and I link to a different form page from each web page where someone can click to sign up. Examples: https://www.facebook.com/photo.php?f...type=1&theater has one of these links that sends the subscriber to a particular form on Jim Oberst Fine Art Newsletter. The constant "fbpghdr" is hard-coded into the form as the hidden variable. This arrangement works, but it's awkward. Whenever I want to do something special to the form page, I have to do it to over a dozen of them. Here's an example of another of these pages: Jim Oberst Fine Art Newsletter.
Is there a way for me to just pass a constant in a "normal" html link, and then to plug this constant into the hidden variable field in the form? I see things that look like they're doing this in some urls after a "?", but I don't know how to actually implement this. I notice that there's one of these in the link above, but it's a .php, not a .html.
Thanks for any help you can give me.