Here is the thing:
I have a form with a few custom filters using the pre_render hook. A dropdown list of provinces is monitored (via JQuery) and a tax rate field (read-only) is populated based on selection (and used to calculate the grand total). See my code here
EVERYTHING WORK FINE EXCEPT, when a required field is missing, it reloads the page showing the required fields highlighted. The problem now is that when this happens, my dropdown is no longer 'monitored' and my read-only fields become editable.
How can I fix this? Here is my code....
http://www.pastie.org/3361172
Thanks