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Ajax Basics

Target Audience
Expected Duration
Lesson Objectives
Course Number

Rather than a singular technology, Ajax, or Asynchronous JavaScript and XML, is a collection of technologies that enables web pages to make server requests without having to reload the page. This course will introduce the history of Ajax and outline how it is commonly used to aid in the development of dynamic web sites. Beginning with the fundamentals of Ajax, the course will examine JavaScript’s role in Ajax development, including objects, the Document Object Model, and events. It will also explore the specific techniques used by Ajax in web applications, including the XMLHttpRequest object, hidden frames, and dynamic script loading. This course is one of a series providing an introduction to Ajax development.

Target Audience
Developers who are experienced in building Internet applications and who want to become skilled in the use of Ajax to add seamless interactivity to their web applications.

A good knowledge of HTML, JavaScript, basic programming concepts, and general Internet development; programming experience would be an advantage

Expected Duration (hours)

Lesson Objectives

Ajax Basics

  • recognize how Ajax is used in web applications
  • specify how the different technologies behind Ajax are used
  • recognize how the Ajax application model works
  • determine if you should use Ajax when developing a web application in a given scenario
  • create and destroy objects
  • create nodes in the DOM
  • register events in Internet Explorer and Mozilla browsers
  • use a cross-browser approach to registering event objects
  • use JavaScript when developing Ajax applications
  • recognize key characteristics of the XMLHttpRequest object
  • use the XMLHttpRequest object in an application to retrieve information from the server
  • identify how to resolve issues when using the XMLHttpRequest object
  • use the POST method to prevent a browser from caching content
  • create multiple XMLHttpRequest objects in an application
  • use an array to manage multiple XMLHttpRequest objects
  • use inner functions to manage multiple XMLHttpRequest objects
  • use hidden frames
  • use hidden inline frames
  • use dynamic script loading
  • use images and cookies
  • use the XMLHttpRequest object
  • use multiple concurrent XMLHttpRequests
  • use alternative Ajax request techniques to XMLHttpRequest
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