Real World XML

Handling Mouse Events

I'll close this chapter with a reasonably full-scale example that uses the mouse. You can use it in either the Netscape Navigator or Internet Explorer (even though event handling works differently in those two browsers). I determine what browser the user has by checking the appName property of the navigator object; the two possible values of navigator.appName are "Microsoft Internet Explorer" or "Netscape" in these two browsers.

Here are the JavaScript events that this program will use:

• onMouseDown— Happens when a mouse button goes down in the page

• onMouseUp— Happens when a mouse button goes up in the page

When you press or release the mouse button in this page, the code reports the location of the mouse. To find the (x, ...