Validating data in javascript

You might like to open the source code for this form in a separate window, so that you can refer to it throughout the tutorial.

You can see that the page consists of a Java Script function called That's all there is to simple Java Script form validation!

The password must have at least one of each of the following: an uppercase letter, a lowercase letter, and a number. If the password is invalid, the browser displays a message box.

Server-side validation is more secure but often more tricky to code, whereas client-side (Java Script) validation is easier to do and quicker too (the browser doesn't have to connect to the server to validate the form, so the user finds out instantly if they've missed out that required field! In this tutorial we'll build a simple form with client-side Java Script validation.

If you use the on Validate attribute, you can also use the on Error attribute to specify a Java Script function that handles the validation errors.

For Each gv Row As Grid View Row In gv Course Fees Details.

This tutorial will show you how to create a Java Script-enabled form that checks whether a user has filled in the form correctly before it's sent to the server. First we'll explain why form validation is a useful thing, and then build up a simple example form, explaining things as we go along.

At the end, there's a little exercise to keep you busy too!

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