JavaScript Form Validation Framework

Why use JavaScript Form Field Validation?

You can be sure that any user that completes a form will make some data entry mistake, mistakes you want to catch before submitting the data to the database server or other mechanism.

The validation of the data is up to the web programmer. Sometimes you need to make sure that there is a value in a required form field, a valid numerical range, valid characters or a valid format etc.

JavaScript Form Field Validation is used to enhance the user experience by not having the web form submit to the server before validating the user input, this reduces the users' waiting time and also reduces load on the server.

It should be noted that JavaScript is not to be relied on solely for input validation as the user can turn JavaScript of and bypass the checks, JavaScript is to enhance user experience and reduce server load only.

Why use this framework for Form Field Validation?

Generic form field validation is something that could take months to write, this framework has been written over a period of several years and has been tested on many websites.

Features

Validates all form fields in one go instead of one at a time
Checks for required input
Checks for several (not just one) valid numerical ranges
Checks for valid character ranges
Checks for a valid format
Checks whether a checkbox, radio button or dropdown selection is made
Custom error messages
Define validation scripts with XML
Define custom error handlers
Years of development
No inline JavaScript required, all code can be moved to include
No obtrusive additional coding required on the fields itself
Cross browser support

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