JavaScript Examples Bible - UserWorks Technologies

Chapter 13 ✦ Event Objects (Chapter 29)
Listing 29-16: Displaying keyCode Property Values
keyCode Property
TD {text-align:center}
function showCode(which) {
document.forms[0].elements[which].value = event.keyCode
}
function clearEm() {
for (var i = 1; i < document.forms[0].elements.length; i++) {
document.forms[0].elements[i].value = “”
}
}
keyCode Property
Eventevent.keyCode
onKeyDown:
onKeyPress:
onKeyUp:
The following are some specific tasks to try with the page to examine key codes
(if you are not using a browser set for English and a Latin-based keyboard, your
results may vary):
1. Enter a lowercase letter “a”. Notice how the onKeyPress event handler shows
the code to be 97, which is the Unicode (and ASCII) value for the first of the
lowercase letters of the Latin alphabet. But the other two events record just
the key’s code: 65.
2. Type an uppercase “A” via the Shift key. If you watch closely, you see that the
Shift key, itself, generates the code 16 for the onKeyDown and onKeyUp events.
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(IE) event.keyCode