Caps Lock 키 상태 체크 > script

<script>
function capLock(e)
{
 kc = e.keyCode ? e.keyCode : e.which;
 sk = e.shiftKey ? e.shiftKey : ((kc == 16) ? true : false);
 if(((kc >= 65 && kc <= 90) && !sk)||((kc >= 97 && kc <= 122) && sk))
 {
  document.getElementById('divMayus').style.visibility = 'visible';
 }
 else
 {
  document.getElementById('divMayus').style.visibility = 'hidden';
 }
}
</script>

<input name="txtPassword" onkeypress="capLock(event)" type="password">
<div id="divMayus" style="visibility:hidden">Caps Lock 키가 눌려있습니다.</div>