combine 3 form values into 1
I have a form where dob is generated using 3 select boxes, 1 for day, month and year. My output needs to be in the form dob=dd-mm-yyyy rather than day=dd, month=mm and year=yyyy.
It has been suggested that i do the following:
"On submit button click, use JS to create a hidden input (Q5) in the form and assign its value, then disable the day, month, and year fields so they are not submitted."
Does anyone know how to do this?