描述

WEB 2.0 Programming with AJAX E.Soundararajan SIRD, IGCAR Web 2.0 Fly By Web 2.0 is really an “after-the-fact” catch-all for a collectively recognized phenomena the foaf project Web 2.0 is the network as platform, spanning all connected devices; Web 2.0 applications are those that make the most of the intrinsic advantages of that platform: delivering software as a continually-updated service that gets better the more people use it, consuming and remixing data from multiple sources, including individual users, while providing their own data and services in a form that allows remixing by others, creating network effects through an "architecture of participation," and going beyond the page metaphor of Web 1.0 to deliver rich user experiences. Tim O'Reilly, “Web 2.0: Compact Definition?” Lets continue looking... What Makes the Web 2.0 Different? Personalized User oriented Easy to Use Get you to the information you want Useful Characteristics of Conventional Web Application “Click, wait, and refresh” user interaction > Page refreshes from the server needed for all events, data submissions, and navigation > The user has to wait for the response Synchronous “request/response” communication model Browser always initiates the request Issues of Conventional Web Application Slow response Loss of operation context during refresh Excessive server load and bandwidth consumption Lack of two-way, real-time communication capability for server initiated updates These are the reasons why Rich Internet Application (RIA) technologies were born. Rich Internet Application (RIA) Technologies Macromedia Flash Java Web Start DHTML DHTML with IFrame AJAX Macromedia Flash Designed for playing interactive movies Programmed with ActionScript Implementation examples > Macromedia Flex > Laszlo suite (open source) Pros: > Good for vector graphics Cons: > Browser needs a Flash plug-in > ActionScript is proprietary and

AI 摘要