How to identify disabled fields in form submit handler?
There's not really enough information in the question to provide a definitive answer but what I'd suggest is:


add one or more hidden fields to the form to hold state information
store values in the field(s) using javascript when the state of the form changes with user action
On the server side, use the value(s) from the hidden field(s) to represent the state of the form so you can employ them in validation logic.