Realtime Form Validation Using AJAX

Realtime Form Validation Using AJAX: "Article
Realtime Form Validation Using AJAX

By Greg Murray, April 2006

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Editor's Note: This article is taken from the The Java BluePrints Solutions Catalog, a new project from the Java BluePrints program. The Java BluePrints program consists of a set of guidelines and best practices, as well as small applications to illustrate these guidelines on both the J2EE 1.4 and 1.5 platforms.

If you've ever entered form data on the Internet, you've likely encountered cases where server-side processing is used to validate that the data meets a specified set of criteria. JavaScript may be used on the client-side to validate the format of simple data such as email addresses, phone numbers, dates, or credit card numbers. However, client-side processing is limited in that it cannot apply business rules or access server-side data sources to perform that validation."