keydown | onkeydown event (Windows)

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Fires when the user presses a key.

Syntax

HTML Attribute	<element onkeydown = "handler(event)">
Event Property	object.onkeydown = handler;
addEventListener Method	object.addEventListener("keydown", handler, useCapture)

Event information

Synchronous	No
Bubbles	No
Cancelable	No

Event handler parameters

pEvtObj [in]: Type: IHTMLEventObj

Standards information

HTML 4.01 Specification, Section 18.2.3

Remarks

You can cancel all keys that fire the onkeydown event in HTML Applications, including most accelerator keys, such as ALT+F4.

Returns a number specifying the keyCode of the key that was pressed.

To invoke this event, do one of the following:

Press any keyboard key.

Examples

This example uses the onkeydown event to cancel input from the keyboard.

Code example: http://samples.msdn.microsoft.com/workshop/samples/author/dhtml/refs/onkeydown.htm


<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>

keydown | onkeydown event