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Chapter 4
The Browser Window
In this chapter, you'll learn how to program the browser window, the
top-level object in the Dynamic HTML object model. Through the
window object, information about the browser and the contained document can be accessed.
Two types of HTML documents can be displayed inside a window: a frameset
document and a standard HTML document. Frameset documents partition a
single window into multiple, independently accessible frames. Chapter 5,
"Window and Frame Management," and Chapter 6, "The HTML Document," discuss
the two types of documents in detail.
The window object exposes document information (including
information about the frames on the page and the URL for the current document)
and provides access to information about the browser itself (including the
client brand, version, and features supported, through a
navigator object), access to event information, and most important, access to the
document object that exposes the HTML document itself. The
window object also lets you move forward and backward through the history, customize the browser's
appearance, and move and relocate the window.
This chapter and Chapter 5 teach you how to manipulate the browser
and the contained document using the window object. This chapter focuses on
the members for manipulating the current window; Chapter 5 continues the
discussion by showing you how to manipulate framesets and multiple
browser instances.
The following topics are covered in this chapter:
- The window object This section provides a brief introduction to the window object and its relationship to other objects, including its unique relationship to global variables, which act as public members of the window object.
- The window environment This section shows you how to manipulate the browser environment—including the browser's status bar, the location of the document, the history list, and the user's screen resolution.
- Window events The window object exposes changes in the
document's state through several events. For example, these events
can help you determine when the document has finished loading
and whether the document is currently active.
- Timer events The window object also exposes methods for
creating timers. Timers are events that execute code after a specified
amount of time.
- The clientInformation or navigator property The navigator object exposes specific information about the client. This information includes the brand, version, and user options, allowing scripts to determine the capabilities of the client and to adjust the page accordingly.
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