Validating form input javascript

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If so, it allows it to be submitted to the server and (usually) saved in a database; if not, it gives you error messages to explain what you've done wrong (provided you've done it right).

Java Script provides a way to validate form's data on the client's computer before sending it to the web server. First let us see how to do a basic form validation.

First, download the Java Script form validation script here.

The zip file contains the javascript file, examples.

More and more browsers now support the constraint validation API, and it's becoming reliable.

This API consists of a set of methods and properties available on each form element.

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