I am creating a fillable order form where people must enter an amount in some of the fields. Only certain amounts are permitted (multiples of the item price). I wish the people who designed the form originally had alllowed a quantity field, because then this would have been a lot easier, but they didn't.
Is there any way to create a validation script which would only accept the permitted valuables, returning a message like "Sorry, you must have miscalculated!" if they enter an incorrect value? I thought about using a drop down list with only the accepted values, but I'm not sure how high I need to go, so I'd rather just let the people filling out the form enter the amount themselves.
Thanks in advance.