In this lesson you will learn how to create an instance of the
XMLHTTPRequest object regardless of which browser your user may have. The object’s properties and methods will be introduced.
Lesson 7, “Anatomy of an Ajax Application,” introduced the building blocks of an Ajax application and discussed how these pieces fit together.
This lesson examines the object at the heart of every Ajax application—the
XMLHTTPRequest object, after it has been created, becomes a further such object within the page’s object hierarchy ...