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Lecture 10 Answers


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Lecture 10 Answers

  1. 1. IS4 030 - Website Design for e-Commerce By SMIEEE, SMACM, MACS E-mail: [email_address] Room: P7919 Consultation Hours: 3:30 - 5:30pm Monday Lecture Ten AJAX
  2. 2. Where AJAX is applied ?
  3. 3. AJAX Applications
  4. 4. Typical AJAX Applications <ul><li>Real-Time Form Data Validation </li></ul><ul><ul><li>Form data that require server-side validation can be validated in a form “before” the user submits it. </li></ul></ul><ul><li>Auto completion </li></ul><ul><ul><li>A specific portion of form data can be auto-completed as the user types. </li></ul></ul><ul><li>Master Details Operations </li></ul><ul><ul><li>Based on a client event, an HTML page can fetch more details from the Server without refreshing the page. </li></ul></ul><ul><li>Sophisticated UI Controls </li></ul><ul><ul><li>Controls such as tree controls, menus, and progress bars without page refreshes . </li></ul></ul>
  5. 5. A Completed Example <ul><li>form name=&quot;myForm&quot;> </li></ul><ul><li>Name: <input type=&quot;text&quot; </li></ul><ul><li>onkeyup=&quot;ajaxFunction();&quot; name=&quot;username&quot; /> </li></ul><ul><li>Time: <input type=&quot;text&quot; name=&quot;time&quot; /> </li></ul><ul><li></form> </li></ul><ul><li></body> </li></ul><ul><li></html> </li></ul><ul><li>What does this AJAX program/HTML do? </li></ul>
  6. 6. AJAX Problems <ul><li>Breaking the “back” button </li></ul><ul><ul><li>Browsers record static page visits </li></ul></ul><ul><ul><li>The AJAX page is dynamic and it’s difficult to determine which one is the previous state </li></ul></ul><ul><li>Changing parts of the page unexpectedly </li></ul><ul><ul><li>A page is unintentionally altered because of some AJAX codes are incidentally executed. </li></ul></ul><ul><li>Bookmarking a particular “State” becomes difficult </li></ul><ul><ul><li>AJAX engine generates the page NOT server </li></ul></ul>
  7. 7. AJAX Problems <ul><li>Difficult to Debug </li></ul><ul><ul><li>Processing logic both in client and server </li></ul></ul><ul><li>Viewable Source </li></ul><ul><ul><li>Open to hackers or plagiarism for the processing logic </li></ul></ul><ul><li>Increased Server Load </li></ul><ul><ul><li>Asynchronous request is a “heavy” operation </li></ul></ul>
  8. 8. AJAX Resources <ul><li>Frameworks </li></ul><ul><ul><li>Client-side </li></ul></ul><ul><ul><ul><li>DOGO </li></ul></ul></ul><ul><ul><ul><li>BackBase </li></ul></ul></ul><ul><ul><ul><li>AJForm </li></ul></ul></ul><ul><ul><li>Server-side </li></ul></ul><ul><ul><ul><li>JSON (Javascript Object Notation) </li></ul></ul></ul><ul><ul><ul><li>Struts – Layout </li></ul></ul></ul><ul><ul><ul><li>ComfortASP.NET </li></ul></ul></ul><ul><ul><li>Many more at </li></ul></ul><ul><ul><ul><li> </li></ul></ul></ul>