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Client-side scripting, as the name implies, is executed scripting code that occurs on the client. This is commonly used for purposes of form validation. For example, if you create a form that contains a text box for the user to enter his or her age, you don't want to let the user enter values like "Bob" or "53213". One way to prevent this is to let the user submit the form, even with erroneous values, and check whether or not the values the user entered were valid using ASP. This is referred to as server-side form validation. Client-side form validation, on the other hand, checks to make sure the values entered into the form are valid before the form is submitted to the server.

Client-side scripting must be done using JavaScript as the scripting language, since Netscape Navigator only accepts JavaScript as a legal, client-side scripting language. Due to the fact that most ASP pages are developed using VBScript as the server-side language, many ASP developers either don't know JavaScript, or are a little rusty at it. Do not fear! The following tutorials will more than help you learn or sharpen your JavaScript skills.

Thau's JavaScript Tutorial
In this tutorial, Thau introduces JavaScript and its concepts. An examination of JavaScript's uses, and a look at JavaScript syntax and protocol is also included. This tutorial also serves as an introduction to scripting language programming.

Thau's Advanced JavaScript Tutorial
This tutorial looks at the JavaScript language in greater detail. The constructs are closely examined, string handling is discussed, as well as other JavaScript issues. The concepts of JavaScript programming are discussed here. There is no talk of form validation.

Quick-Hit JavaScript Questions
Here's the place to check out if you have a specific question concerning JavaScript. Wondering how to use cookies, or how to handle form validation? This article answers several commonly asked JavaScript questions.

VBScript-to-JavaScript Translations
One disadvantage of JavaScript is that it doesn't contain many of the nice formatting functions that are inherent with VBScript. To help overcome that shortcoming, the VBScript-to-JavaScript section implements several common VBScript functions in JavaScript code so you can use them in your client-side JavaScript code!

Learning JavaScript is an important aspect of web development. It's unfortunate that so many languages need to be learned to work with the web. However, JavaScript is one of the important ones, and it is important that you at least have an understanding of how JavaScript works, what it can do, and the general form of its syntax.

Happy Programming!

Additional JavaScript Resources from Jupitermedia

• JavaScript.com
• JavaScript Tutorial for Programmers
• The JavaScript Diaries: Part 1
• WebReference JavaScript Articles
• Javascript Primers

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