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Ajax Basics And Framework

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Transcript

  • 1. Ajax Basics and Framework K.shivaprasad 9092696592
  • 2. What is Ajax? Ajax(Asynchronous Java Script and Xml)is a group of interrelated web development techniques used on the client-side to create interactive web applications
  • 3. More about Ajax
    • With ajax web application can retrieve data from the server asynchronously in the background with out interfering with the display and behavior of the existing page.
    • Data are usually retrieved using the XMLHttpRequest object
    • Ajax uses the combination of HTML and CSS to markup and style information
  • 4. Continue..
    • The Dom is accesed with javascript to dynamically displays and to allow the user to interact with the information presented.
    • Java script and the XMLHttpRequest object provide a method for exchaning data asynchronously between browser and server to avoid full page reload.
  • 5. Technologies in Ajax.
    • HTML or XHTML and css for presentation
    • The Dcument Object Model for dynamicallydisplay of and interaction with data.
    • XML and XSLT for the interchange and manipulation and Display of date respectively
    • The XMLHttpRequest object for Asynchronous communication
    • Javascript to bring these technologies together.
  • 6. Ajax Uses.
    • Using a Ajax web application an request may the context that needs to be updated thus draftically reducing the bandwidth usage and load time.
    • The use of asynchronous requests allows the clints web browser UI to be more interactive and to respond quickly to inputs and sections of pages can also be reloaded individually.
    • The use of Ajx can reduce connection to the server,since scripts and style only here to be requested once.
  • 7. Draw Backs
    • Owing to their dynamic nature.Ajax interfaces are often harder to develop when comared to static pages
    • Pages dynamically created using successive Ajax requests do not automatically register themselves with the browsers history engine.
    • Dynamic web page updates also make ifdifficult for a user to bookmark a particular state of application.
    • Because most web Crawlers donot execute Javascript code.
  • 8. Drawbacks Continue..
    • The same origin policy prevents some Ajax techniques from being used across domains.
    • Like other web technologies Ajax has its own set of changes that developers must address.
    • Developers familar with other web technologies may have to learn new testing and coding methods to write secure Ajax application.
  • 9. Thank you. .