ColdFusion Developer's Guide

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■ Adding a validation rule to a field does not make it a required field. You must add a
separate _required hidden field to ensure user entry.
Hidden form field example
The following procedure creates a simple form for entering a start date and a salary. It uses
hidden fields to ensure that you enter data and that the data is in the right format.
This example uses a self-submitting form; the same ColdFusion page is both the form page
and its action page. The page uses an IsDefined function to check that form data has been
submitted. This way, the pages does not show any results until you submit the input. The
form uses HTML tags only; you can substitute these tags with the CFML equivalents.
Simple Data Form
Simple Data Form
Start Date:
Salary: