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Most error checking programs check each field one at a time, and display one error at a time.

This can make filling out the form tedious, and people might stop in the middle.

For example, if you are going to send an email confirmation letter, the email address should be included in the form fields, and it should be an email address that works.

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It checks to see if the required fields are there, and if not, saves an error message into a variable for display: The difference with how the CGI writes the error message is that instead of a "\n", it uses the HTML paragraph tag to put a new line in between each error.

Form validation normally used to occur at the server, after the client had entered all the necessary data and then pressed the Submit button.

For example, if you have set length limit in the database for a text input, it is better to do the validation before it actually gets cut off by the database system or even getting an error thrown.

Often, people confuse form validations with form security.

When there are many fields in the form, the Java Script validation becomes too complex.

The Java Script class presented here makes the form validations many times easier.

is called when the element had the focus, and the user changed to another control (which is usually an indication that they have finished with the current input field).

Using client side Java Script is an efficient way to validate the user input in web forms.

First, download the Java Script form validation script here.

The zip file contains the javascript file, examples.

When you use the form data in an SQL query, it should be validated against SQL Injection.

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