OnKeyDown event can be used to trigger JavaScript code.

Object.onKeyDown="execute function or code"

Inside an tag or element
Like onkeypress event demo here also one one char less will be copied.
<title>Demo of on onkeyDown events in Javascript</title>
<script language=JavaScript>
function copy()

<form name=my_form method=post>
What ever you type here 
<input  type=text id=t1 name=text onKeyDown=copy();> 
(Type minimum two chars)<br><br> will be copied to below textarea. <br>
<textarea id=t2   name=my_text rows=4 cols=30></textarea></form>

Detecting which arrow key is pressed by onkeydown event

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