First of all, I have to apologise. It's been literally two months since my last post in this series, and it's been more than that since I last looked at Ajax in PHP. OK, I might admit it, it was this comment that motivated me to pick up this series again. Oh, that and I'm now on the half term break, so I'm finally getting round to some things that have been on the back burner for a long time.

In our last Ajax tutorial, we got started with Ajax using PHP and made our first Ajax application.

Today, we're going to take Ajax a little further, by building a little application where our user selects a product from a pop-up list, and then we do a little Ajax dance to get some product details (and an image) and display them in a box below. We'll be making our own little XML schema which we'll use to pass information between the JavaScript in the user's browser and our PHP script on the server.

Requirements

For this tutorial, you'll need the following (and in brackets, I'll show you what I'll be using):

* A web server running PHP (I'm using PHP 5, but it might work on PHP 4).
* A decent browser (I'll be using Firefox 2.0.0.1).
* A decent text editor and/or IDE that supports Unix line breaks if you download my set of files (I'm using the best web development IDE in the world, Quanta).
* Some patience, time, determination and enough hair to rip out when the JavaScript is going wrong (check, check, check).

Also highly recommended, but not required, is the Firebug extension for Firefox, as it makes checking and debugging your JavaScript a lot easier.


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