## Examples
This example uses the onkeydown event to cancel input from the keyboard.
<script type="text/javascript">
function fnTrapKD(){
if(oTrap.checked){
oOutput.innerText+="[trap = " + event.keyCode + "]";
event.returnValue=false;
}
else{
oOutput.innerText+=String.fromCharCode(event.keyCode);
}
}
</script>
<input type="checkbox" id="oTrap">
<input id="oExample" type="text" onkeydown="fnTrapKD()">
<textarea id="oOutput" rows="10" cols="50">
</textarea>
You can cancel all keys that fire the onkeydown event in HTML Applications, including most accelerator keys, such as ALT+F4. As of Microsoft Internet Explorer 5, the event also fires for the following keys:
As of Internet Explorer 5, this event can be canceled for the following keys and key combinations by specifying event.returnValue=false:
As of Microsoft Internet Explorer 4.0, the onkeydown event fires for the following keys:
In Internet Explorer 4.0, you cannot cancel the onkeydown event, but you can use the onkeypress event to cancel keyboard events. Returns a number specifying the keyCode of the key that was pressed. To invoke this event, do one of the following:
Microsoft Developer Network: [Windows Internet Explorer API reference Article]
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