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A Short Tutorial on XMLHttpRequest()
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02/18/2006 By Bob Smith
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This tutorial will show you how to build a web page that responds to asynchronous events. In five simple exercises, we'll show you the core of an Asychronous JavaScript And XML (AJAX) application. You'll have to learn a little JavaScript, but there's no requirement to learn anything about XML. Our goal is to show you how to build a responsive web application with a minimum investment of time.
What you should already know: You should be familiar with basic web page creation and have a general idea of the client/server nature of web page requests. You should also understand how CGI programs work and have some experience with CGI programming; we use a few lines of PHP in our exercises, but you can replace this with C or Perl if you wish.
Requirements for the examples: To do the exercises in this tutorial, you will need a browser with JavaScript enabled. JavaScript is on by default in most browsers, so this shouldn't require any action on your part unless you prevously disabled it. You will also need to have a web server that supports PHP and CGI, and the ability to upload web pages to it. You should be ready to go if you already have Apache and PHP installed on your PC; in fact, our exercises assume that you're using your PC for the web server.
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