Modifying form data before submission

Giganews Newsgroups
Subject: Modifying form data before submission
Posted by:  Logical (log…
Date: Fri, 25 Jul 2003

I have a form which houses basic inputs, as well as a few multiple select

I need to parse all the 'values' which are in this multiple select form (it
gets manipulated dynamically client side). I wanted to create a function
that loops through all the form elements, and if the type 'select-multiple'
is detected, gather the VALUES of each <option> inside it.

The bit I'm stuck on is then how to reconstruct this into a form submission.
Preferably I wanted the data from the 'select-multiple' element to be
submitted as comma delimited, eg 14,12,512,63,62 which would later be parsed
by PHP.

I was considering reconstructing a query string and submitting that as GET,
but I'd prefer to POST it along with the other data (such as INPUTS etc)
which do not need to be changed.

Can I somehow attach some 'hidden' type data onto the end of the form
submission at this point?

Thanks in advance