Sams Teach Yourself JavaScript™ in 24 Hours, Fifth Edition

Hour 17. Creating a Simple Ajax Library

What You’ll Learn in This Hour

• How to build a simple, reusable Ajax library

• Including the library in your application

• Returning text data

• Using XML

In this hour you learn how to encapsulate some of the techniques you learned in Hour 16, “Introducing Ajax,” into a small JavaScript library that you can use in your applications.

An Ajax Library

Through the code examples you studied in Hour 16, you learned a number of JavaScript code techniques for implementing the various parts of an Ajax application. Among those methods are

• A method for generating an instance of the XMLHttpRequest object, which works across the range of currently popular browsers

• Routines for building and sending GET and POST ...