JavaScript Examples Bible - UserWorks Technologies

Chapter 2 ✦ Window and Frame Objects (Chapter 16)
Example
Use The Evaluator (Chapter 13 in the JavaScript Bible) to experiment with the
screenX and screenY properties in NN6. Start with the browser window maximized
(if you are using Windows). Enter the following property name into the top
text box:
window.screenY
Click the Evaluate button to see the current setting. Unmaximize the window and
drag it around the screen. Each time you finish dragging, click the Evaluate button
again to see the current value. Do the same for window.screenY.
scrollX
scrollY
NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5
Compatibility ✓
Example
Use The Evaluator (Chapter 13 in the JavaScript Bible) to experiment with the
scrollX and scrollY properties in NN6. Enter the following property into the top
text box:
window.scrollY
Now manually scroll the page down so that you can still see the Evaluate button.
Click the button to see how far the window has scrolled along the y-axis.
self
NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5
Compatibility ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Example
Listing 16-16 uses the same operations as Listing 16-5 but substitutes the self
property for all window object references. The application of this reference is
entirely optional, but it can be helpful for reading and debugging scripts if the
HTML document is to appear in one frame of a multiframe window — especially if
other JavaScript code in this document refers to documents in other frames. The
self reference helps anyone reading the code know precisely which frame was
being addressed.
149
windowObject.self