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keycodes and events

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keycodes and events - 10/29/2005 6:28:48 PM

TNO

Posts: 1075
Score: 10
Joined: 12/18/2004
From: thenewobjective.com
Status: offline

This simple program displays the Keycode & event type for a key pressed. Good for a quick reference.

<html>
<head>
<title>Keyboard Events and Codes</title>
<style type="text/css">
body {font-family:Arial, sans-serif}
h1 {text-align:right}
td {text-align:center}
</style>
<script language="JavaScript" type="text/javascript">
// array of table cell ids
var tCells = ["downKey", "pressKey", "upKey", "downChar", "pressChar", 
"upChar", "keyTarget", "character"];
 
// clear table cells for each key down event
function clearCells() {
   for (var i = 0; i < tCells.length; i++) {
       document.getElementById(tCells[i]).innerHTML = "&mdash;";
   }
}
 
// display target node's node name
function showTarget(evt) {
   var node = (evt.target) ? evt.target : ((evt.srcElement) ? 
              evt.srcElement : null);
   if (node) {
       document.getElementById("keyTarget").innerHTML = node.nodeName;
   }
}
 
// decipher key down codes
function showDown(evt) {
   clearCells();
   evt = (evt) ? evt : ((event) ? event : null);
   if (evt) {
       document.getElementById("downKey").innerHTML = evt.keyCode;
       if (evt.charCode) {
           document.getElementById("downChar").innerHTML = evt.charCode;
       }
       showTarget(evt);
   }
}
 
// decipher key press codes
function showPress(evt) {
   evt = (evt) ? evt : ((event) ? event : null);
   if (evt) {
       document.getElementById("pressKey").innerHTML = evt.keyCode;
       if (evt.charCode) {
           document.getElementById("pressChar").innerHTML = evt.charCode;
       }
       showTarget(evt);
       var charCode = (evt.charCode) ? evt.charCode : evt.keyCode;
       // use String method to convert back to character
       document.getElementById("character").innerHTML = 
           String.fromCharCode(charCode);
   }
}
 
// decipher key up codes
function showUp(evt) {
   evt = (evt) ? evt : ((event) ? event : null);
   if (evt) {
       document.getElementById("upKey").innerHTML = evt.keyCode;
       if (evt.charCode) {
           document.getElementById("upChar").innerHTML = evt.charCode;
       }
       showTarget(evt);
   }
}
 
// set page-wide event listeners
document.onkeydown = showDown;
document.onkeypress = showPress;
document.onkeyup = showUp;
</script>
</head>
<body>
<h1>Key and Character Codes vs. Event Types</h1> 
<hr>
<p>Enter some text with uppercase and lowercase letters:<br>
<form>
<input type="text" id="entry" size="60" 
      onkeydown="showDown(event)" 
      onkeypress="showPress(event)" 
      onkeyup="showUp(event)">
</textarea></p>
</form>
<table border="2" cellpadding="5" cellspacing="5">
<caption>Keyboard Event Properties</caption>
<tr><th>Data</th><th>keydown</th><th>keypress</th><th>keyup</th></tr>
<tr><td>keyCode</td>
   <td id="downKey">&mdash;</td>
   <td id="pressKey">&mdash;</td>
   <td id="upKey">&mdash;</td>
</tr>
<tr><td>charCode</td>
   <td id="downChar">&mdash;</td>
   <td id="pressChar">&mdash;</td>
   <td id="upChar">&mdash;</td>
</tr>
<tr><td>Target</td>
   <td id="keyTarget" colspan="3">&mdash;</td>
</tr>
<tr><td>Character</td>
   <td id="character" colspan="3">&mdash;</td>
</tr>
</table>
</body>
</html>[/align]

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