Windows and Frames

Chapter 12, JavaScript in Web Browsers, described the Window object and the central role it plays in client-side JavaScript. We've seen that the Window object serves as the global object for client-side JavaScript programs, and as illustrated in Figure 12.1, it is also the root of the client-side object hierarchy.

Besides these special roles, the Window object is an important object in its own right. Every web browser window and every frame within every window is represented by a Window object. The Window object defines quite a few properties and methods that are important in client-side JavaScript programming. This chapter explores those properties and methods and demonstrates some important techniques for programming with windows and frames. Note that because the Window object is so central to client-side programming, this chapter is quite long. Don't feel you have to master all this material at once - you may find it easier to study this chapter in several shorter chunks!