DHTML Lab - DHTML Diner - NS4/IE4: Using the Keypress Event (4)

Using the Keypress Event (4)

Step-by-Step

1. Include this script in your page:

<SCRIPT LANGUAGE="JavaScript1.2">
<!--
IE4 = (document.all);
NS4 = (document.layers);
if (NS4) document.captureEvents(Event.KEYPRESS);
document.onkeypress = doKey;
function doKey(e) {
  whichASC = (NS4) ? e.which : event.keyCode;
  whichKey = String.fromCharCode(whichASC).toLowerCase();
  switch (whichKey) {
    case "a":
      ...statements to execute if "a" is pressed...
      break;
    case "b":
      ...statements to execute if "b" is pressed...
      break;
    case "1":
      ...statements to execute if "1" is pressed...
      break;
    case "2":
      ...statements to execute if "2" is pressed...
      break;
    case "y":
      ...statements to execute if "y" is pressed...
      break;
    case "n":
      ...statements to execute if "n" is pressed...
      break;
    .
    . other alphanumeric "hot" keys
    .
    default:
    ...statements to execute if no "hot" key is pressed...
    or include the break statement:
    break;
  }
}
//-->
</SCRIPT>

2. Define your "hot" keys as strings in the switch statement's case labels, as in the example above.

3. In each case label, place the appropriate JavaScript statements to be executed when that key is pressed. End statement list with a break.

4. Optionally, define a default behavior in case the key pressed is not "hot", in the default: label.

5. If the hot keys are case-sensitive, omit the toLowerCase() method when declaring whichKey, and define different statements for upper and lower case characters.