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The validation script in this article returns a Boolean value that specifies whether the data contained in the form is valid. Variables are not required, but they make accessing each field easier.
To create your own custom function, insert a SCRIPT element into the HEAD section of your form page; within the SCRIPT element, use the function statement to insert a function named Validate Contact Form. This code should look something like the following code sample. Starting script function To access the form fields within the code, you should create variables. For example, without a variable, you would have to type document. Name every time you needed to access the Name field.
In addition, each of the fields should have a unique name.
Use the following table to assign names to all of your form elements.
However, client-side validation may not work in all instances.
For more information about creating a function, see JScript Functions.
Knowing the limits of client-side scripting helps you decide whether to use client-side form validation.
This article explains how to provide client-side validation for forms that you create either by hand or by using the form tools within Front Page.
Server-side validation incorporates code validation into a form handler. NET application on the server that provides the functionality that your form needs for processing after a customer has submitted it.
Because the code is stored on the server, server-side validation requires a roundtrip to the server.