Stepping back for a moment to the script that I previously developed in the first article, it implements a simple mechanism for fetching data from a plain text file and displaying the information through a predefined sequence. Although the example is rather basic, it does exposes the foundations of AJAX technology for building more complex and polished applications, by utilizing as core programming logic the powerful capabilities for sending silent http requests on the fly.
The best thing with this approach is that it offers a broad range of applications for fetching data from the server in multiple formats. Of course you have already seen how easy it is to fetch data from flat text files and display their contents directly on the browser, all without messing up things too much with complex server-side programs. Moreover, AJAX comes with native support for pulling out data served as XML, by using the “responseXML” property that belongs to the XMLHtttpRequest object.