Understanding Client-Side Validation
To perform client-side validation, you add a series of browser instructions to your Web page. The browser interprets these instructions and executes them right on the user’s computer (i.e., on the client side) before the form ever gets submitted to the server.
These instructions are written in scripting languages, such as JavaScript (supported by almost all browsers) or VBScript (based on Visual Basic and supported by Microsoft Internet Explorer only). These are interpreted languages that enable you to control browser behavior.
Note
Don’t confuse JavaScript with Java. Java is a true compiled object-oriented application development language, one that can be used to write entire programs. JavaScript (including ...
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