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How the Simple Ajax Toolkit can integrate your server-side PHP with JavaScript.

For years, the goal of creating a truly responsive Web application was hampered by
one simple fact of Web development: To change the information on part of a page, a
user must reload the entire page. Not anymore. Thanks to asynchronous JavaScript
and XML (Ajax), we can now request new content from the server and change just
part of a page. This tutorial explains how to use Ajax with PHP and introduces the
Simple Ajax Toolkit (Sajax), a tool written in PHP that lets you integrate server-side
PHP with JavaScript that makes this work.

Section 1. Before you start

This tutorial is for those interested in developing rich Web applications that
dynamically update content using asynchronous JavaScript and XML (Ajax) with
PHP, without having to refresh entire Web pages with each user click. This tutorial
assumes basic PHP concepts, including the use of if and switch statements, and
functions.

About this tutorial

You will learn about Ajax, as well as issues surrounding its usage. You will also build an Ajax application in PHP that will display panels of a section of a previously written tutorial. Clicking on a panel link will reload only the content section and replace it
with the content of the selected panel, saving bandwidth and time loading the page.
Then you will integrate the Simple Ajax Toolkit (Sajax) into your Ajax application,
which will synchronize the use of Ajax, simplifying development…

Section 2. Overview

Before diving in, let’s meet Ajax, the sample PHP application, and Sajax.

Ajax

Ajax allows Web developers to create interactive Web pages without the bottleneck
of having to wait for pages to load. Through Ajax, you can create applications that,
with a click of a button, will replace content in one section of a Web page with totally
new content. The beauty of it is that you don’t have to wait for the page to load,
except for the content to load for that single section. Take Google Maps, for
example: You can click and move the map around without having to wait for page
loads.

Issues with Ajax

There are things to watch out for when using Ajax. Like any other Web page, Ajax
pages are bookmarkable, which can create problems if requests are done with GET
vs. POST. Internationalization and the rising number of encoding schemes makes
standardizing these encoding schemes increasingly important. You will learn about
these important issues in this tutorial.

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