Ajax! Ajax Programming Ajax! Ajax Programming. Ajax! Ajax Programming Take a look at a typical...
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Transcript of Ajax! Ajax Programming Ajax! Ajax Programming. Ajax! Ajax Programming Take a look at a typical...
Ajax!
Ajax Programming
Ajax!
Ajax Programming
Ajax!
Ajax Programming
•Take a look at a typical desktop application (Spreadsheet app, etc.)•The program responses intuitively and quickly•The program gives a user meaningful feedback's instantly•Things happen naturally
Take A Scenario
Ajax!
Ajax Programming
•“Click, wait, and refresh” user interaction•Synchronous “request/response” communication model•Page-driven: Workflow is based on pages
Conventional Web Apps
Ajax!
Ajax Programming
Conventional Web Apps
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Ajax Programming
•Interruption of user operation•Loss of operational context during refresh•No instant feedback's to user activities•Constrained by HTML
These are the reasons why Rich Internet Application (RIA) technologies were born.
Conventional Web Apps Issues
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•Applet (Swing)•Macromedia Flash•Java WebStart•AJAX
RIA Technology
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•Pros:Can use full Java APIsCustom data streaming, graphic manipulation, threading, and GUIs
• Cons:Code downloading timeReliability concern - a mal functioning applet can crash abrowser
Applet
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•Designed for playing interactive movies originally• Pros:
Good for displaying vector graphics• Cons:
Browser needs a Flash plug-inActionScript is proprietary
Macromedia Flash
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•ProsDesktop experience once loadedLeverages Java technology to its fullest extentDisconnected operation is possibleApplication can be digitally signedIncremental redeployment
Java Webstart
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• ConsOld JRE-based system do not workFirst-time download time could be still significant
Java Webstart
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•Asynchronous Javascript and XML.•Not a stand-alone language or technology.•It is a technique that combines a set of known technologies in order to create faster and more user friendly web pages.•It is a client side technology.
AJAX
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•No plugin for AJAX
•Flash development tools cost money
•Flash typically has slower page load time
•Flash can work on older browsers
AJAX vs Flash
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• ActionScript doesn't have a cross browser issues
• Flash can access other domains if there is a crossdomain.xml file
AJAX vs Flash
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•ProsMost viable RIA technology so farTremendous industry momentumSeveral toolkits and frameworks are emergingNo need to download code & no plug-in required
•ConsStill browser incompatibilityJavaScript is hard to maintain and debug
AJAX
Ajax!
Ajax Programming
•Prevents unnecessary reloading of a page.
•When we submit a form, although most of the page remains the same, whole page is reloaded from the server.
AJAX Purpose
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•This causes very long waiting times and waste of bandwidth.
•AJAX aims at loading only the necessary innformation, and making only the necessary changes on the current page without reloading the whole page.
AJAX Purpose
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•Intuitive and natural user interaction
No clicking requiredMouse movement is a sufficient event trigger
•"Partial screen update" replaces the "click, wait, and refresh" user interaction model
Only user interface elements that contain new information are updated (fast response)
Why AJAX?
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•Data-driven (as opposed to page-driven)
UI is handled in the client while the server provides data
•Asynchronous communication replaces "synchronous request/response model."
A user can continue to use the application while the client program requests information from the server
Why AJAX?
Ajax!
Ajax Programming
AJAX
Ajax!
Ajax Programming
AJAX
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Ajax Programming
•Google helped popularize•Increase Usability of Web Applications•Rich Internet Applications without Flash•Save Bandwidth•Download only data you need•Faster interfaces (sometimes)
Why AJAX is Popular
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•JavaScript/PHP
•HTML
•CSS
•XML
•JSP
Technology of AJAX
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AJAX Achi
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Ajax Programming
Classic vs AJAX
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• Google Map • Gmail• NetFlix.com• Flickr• Worklife Survey (old tooltip)• MUSE Calendar (Ajax tooltip)• www.2locals.com (Ajax)
•And many other popping anywhere
Real Life AJAX Example
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“To better understand
the concepts of
AJAX we need to ==activate==
your creativity”
End
Ajax!
Ajax Programming
In a creative role playing, think of REAL LIFE good scenarios that will show the concepts of AJAX such:the interaction of different componentscomparison to classic webEtc……
Note: It’s your cooperation matters; collaborate.
Group Activity: