July 1998
Intermediate to advanced
1456 pages
65h 5m
English
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Examining Mouse Buttons and Key Codes
The next code listing, Example 6.3, further demonstrates how to access
event object properties in both browsers, even
when the properties don’t match up well. In this case, a script
displays information about mouse clicks and key presses in the status
bar, to limit the disruption of the user. For mouse clicks over a
button, this laboratory application presents the identifying integer
for the mouse button used to do the click. For key presses in a text
area, the application displays the character code value of the key
typed by the user.
Example 6-3. Looking for Mouse Button and Keyboard Character Codes
<HTML> <HEAD> <TITLE>Button Codes / Key Codes</TITLE> <SCRIPT LANGUAGE="JavaScript"> var isNav, isIE if (parseInt(navigator.appVersion) >= 4) { if (navigator.appName == "Netscape") { isNav = true } else { isIE = true } } function showBtnOrKey(evt) { var theBtnOrKey if (isNav) { theBtnOrKey = evt.which } else { if (window.event.srcElement.type == "textarea") { theBtnOrKey = window.event.keyCode } else if (window.event.srcElement.type == "button") { theBtnOrKey = window.event.button } } status = theBtnOrKey return false } </SCRIPT> </HEAD> <BODY> <H1>Mouse Button and Key Codes from Event Objects</H1> <HR> <FORM> <P>Click on this <INPUT TYPE="button" VALUE="Button" onClick="showBtnOrKey(event)"> with either mouse button (if you have more than one).</P> <P>Enter some text with uppercase and lowercase letters:<BR> <TEXTAREA COLS=30 ROWS=4 onKeyPress="showBtnOrKey(event)" ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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