188 CHAPTER 6 DECOUPLED NAVIGATION PATTERN Figure 6-17 shows an HTML page containing a box that can be dragged around the page. To make the box work, and be draggable, quite a bit of Dynamic HTML magic is going on. Here is the important fact: the HTML box is Dynamic HTML, and not Ajax per se. As per the original definition,2 Ajax is not a technology, but the combination of several already-existing technologies. The focus of the Ajax patterns is not to explain the Dynamic HTML components, but to use the components in the context of Ajax. Part of the reason why this book does not attempt to explain and illustrate the Dynamic HTML components is that plenty of scripts do those tasks very well.3 The focus of this book is to integrate those already-existing components and make them Ajax aware. The aim of the Presentation functionality is to use the Dynamic HTML compo nents to support the navigation. What is interesting about Figure 6-17 is that the Dynamic HTML to make the draggable pop-up box work is fairly complicated, but the content within the box is rather simple. It shows that the author of the component took great effort to make it easy to use the draggable pop-up box. Consider the following abbreviated source code that creates the pop-up box:
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2. http://www.adaptivepath.com/publications/essays/archives/000385.php 3. http://www.dynamicdrive.com, http://www.dhtmlcentral.com, http://scriptasylum.com, http:// www.hotscripts.com, http://www.howtocreate.co.uk, http://webdeveloper.earthweb.com, and so on. If I did not mention your website, I am sorry. Send me an e-mail at christianhgross@gmail.com, and I will create a reference list at the URL http://www.devspace.com:8080.
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