Homework 5-2-2008

[Lab]
1. Open NVu
2. Based on the code as in http://www.scottandrew.com/weblog/articles/dom_4 ,
write a code to generate the table of 9*9 products. (九九乘法表)

Hint: The javascript code should be enclosed by script tags.




[Reading] AJAX
A New Approach to Web Applications Jesse Garrett
AJAX 簡介 Brett McLaughlin

Ans:

Ajax isn’t a technology. It’s really several technologies, each flourishing in its own right, coming together in powerful new ways. Ajax incorporates:

• standards-based presentation using XHTML and CSS;
• dynamic display and interaction using the Document Object Model;
• data interchange and manipulation using XML and XSLT;
• asynchronous data retrieval using XMLHttpRequest;
• and JavaScript binding everything together.

Google is making a huge investment in developing the Ajax approach. All of the major products Google has introduced over the last year — Orkut, Gmail, the latest beta version of Google Groups, Google Suggest, and Google Maps — are Ajax applications. (For more on the technical nuts and bolts of these Ajax implementations, check out these excellent analyses of Gmail, Google Suggest, and Google Maps.) Others are following suit: many of the features that people love in Flickr depend on Ajax, and Amazon’s A9.com search engine applies similar techniques.

These projects demonstrate that Ajax is not only technically sound, but also practical for real-world applications. This isn’t another technology that only works in a laboratory. And Ajax applications can be any size, from the very simple, single-function Google Suggest to the very complex and sophisticated Google Maps.

If you're developing Web applications these days, then you're doing Ajax development. Ajax is no longer something unusual that you add to your applications in special cases. It has become an integral part of Web development. To some, enhancing applications with Ajax used to be a tricky proposition. Cross-browser limitations to deal with, writing a lot of complicated JavaScript, and learning about magic numeric codes within that JavaScript were just a few of the challenges facing Ajax developers. Thankfully, several open source JavaScript libraries are available now to make things much easier. In this first article in a three-part series, you will create an Ajax application for managing songs using the Prototype JavaScript library and script.aculo.us.

This three-part article series looks at using two separate open source projects, the Prototype JavaScript library and script.aculo.us, to create amazing Ajax applications for your Web 2.0 Web site. In this article, Part 1 of the series, you will be working the Prototype JavaScript library (see Resources for a link). This article uses the latest release of Prototype (at the time of this writing) version 1.6.0.2. Ajax involves dynamic data, and so a server-side technology is needed. In this article, we use PHP 5.2.1 in combination with Apache 2.0.59 and MySQL 5.0.41 (see Resources). You can definitely pick your own programming language, Web server, and database.