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For more detailed descriptions of the on Server validation algorithms, see the table in Validating form data using hidden fields.Used only with cfform submit and image types; prevents the user from submitting the same form multiple times before until the next page loads, Use this attribute, for example, to prevent a user from submitting an order form a second time before getting the confirmation for the initial order, and thereby making a duplicate order, Valid in HTML and XML format only; ignored in Flash format.For detailed information on using Java Script for validation, see Validating form input and handling errors with Java Script.Cold Fusion tests the variable to determine whether it follows a specified validation rule and the function returns true or false.In HTML or XML format, the validation logic is identical to on Blur validation, but the test is not done until the user submits the form.

Although form-specific validation techniques provide good methods for preventing users from submitting invalid or badly formatted data, they cannot prevent users from submitting maliciously formatted data from HTML forms.

The on Blur and on Submit validation algorithms for Flash forms can vary from the validation algorithms described in the following table, and most commonly have less functionality.

The asterisk in the Type field column indicates that the field is required.

Before we begin, you must understand that this type of data input validation is no substitute for server-side validation.

Without server-side validation, you are trusting the user and whatever tools they are using to make sure input is valid.

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