Safer Ajax Web Form Validation With DOM and JSP

[ Thanks to jmalasko for this link. ]

"Client-side validation is useful because it can reduce or even eliminate the cases when the form is returned to the user for correcting errors. Nevertheless, the JavaScript-based validation is not sufficient because it can be bypassed if the data is submitted to the server with a program or if JavaScript is disabled in the user's browser. This article shows how to implement both client-side and server-side validation."

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