JavaScript Examples Bible - UserWorks Technologies

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JavaScript Examples Bible: The Essential Companion to JavaScript Bible
Figure 13-1: onMouseOver event object knows whence the pointer
came.
This is a good example to experiment with in the browser, because it also reveals
a potential limitation. The element registered as the toElement or fromElement
must fire a mouse event to register itself with the browser. If not, the next element
in the sequence that registers itself is the one acknowledged by these properties.
For example, if you roll the mouse into the center box and then extremely quickly
roll the cursor to the bottom of the page, you may bypass the South box entirely.
The text that appears in the statusbar is actually the inner text of the BODY element,
which is the element that caught the first mouse event to register itself as the
toElement for the center table cell.
keyCode
(IE) event.keyCode
NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5
Compatibility ✓ ✓ ✓
Example
Listing 29-16 provides an additional play area to view the keyCode property for
all three keyboard events while you type into a TEXTAREA. You can use this page
later as an authoring tool to grab the precise codes for keyboard keys you may not
be familiar with.