33986Article: Getting Started with Ajaxhttp://www.alistapart.com/articles/gettingstartedwithajaxA List Apart is pleased to present the following excerpt from Chapter 27 of Web Design in a Nutshell (O?Reilly Media, Inc., third edition, February 21, 2006). ?Ed.Ajax > Tips and TutorialsNov 11, 2006A List Apart Magazine and the authors.
Sick of creating web sites that reload every time a user moves the mouse? Tired of servers that wait around to respond to users' requests for movie tickets? It sounds like you need a little (or maybe a lot of) Ajax in your life. Asynchronous programming lets you turn your own web sites into smooth, slick, responsive applications that make your users feel like they're back on the information superhighway, not stuck on a dial-up backroad.
It is already an established problem in Ajax that developers would still need to develop almost two types of applications if they wanted to build an online application good for Mozilla and Internet Explorer. Because of this struggle, developers would have to build almost two different applications that will require a lot more than the usual time for application development.
Unless you live under a rock, you've heard about and likely even used AJAX. Asynchronous JavaScript and XML is becoming an increasingly pervasive deployment methodology, which necessitates that people start to both understand how it works and actually consider it more seriously as an enterprise-level development tool.
OK, this is my second tutorial for AJAX Freaks, so bear with me. Have you ever seen or wished you could have live data on your website? Have you got data stored in a database that UPDATEs reguarly? This tutorial will explain how you can achieve this effect using AJAX and PHP. As I mentioned in my first tutorial, this can be achieved in almost any server side scripting langauge, as long as you know how to make database queries in your desired langauge. I suggest that you know how to use the basic XMLHttpRequest object, if not then you might want to check out my first tutorial on introducing you to AJAX found here. You can find the entire
When an HTML page is used in conjunction with JavaScript technology, this page can contact the server which loaded it and request content. This content may be altered in the form of XML documents, as well regular text, HTML, or JSON. The JavaScript system can then take this content and alter the Document Object Model within the HTML page. Ajax is used as a broad term to describe this interactive model. However, it should be emphasized that Ajax is not entirely new. The underlying technology for Ajax has been available for a number of years.
However, the proliferation of this technology has been hampered by a number of technical barriers. The biggest barrier that Ajax developers faced was the lack of an advanced remote scripting system. To deal with these problems, developers were forced to use Java applets, plug-ins, and frames which were hidden from the eyes of the user. While these tools did create a certain level of interactivity on the web, the system still was heavily limited in its true capabilities.
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