On second keypress (within a specified time frame)

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  • akadeco
    New Member
    • Aug 2009
    • 7
    #1

    On second keypress (within a specified time frame)

    Hi

    I've been wondering if there was a simple way to detect if a user presses the same character on the keyboard twice within one second. I've written some code that kind of works but it's unreliable.

    Code:
    var escapeCount = 0;

function reset() {
	escapeCount = 0;
	setTimeout('reset();', 1000);
}

window.onload = function() {
  reset();
};

document.onkeyup = function(e) {
  if (!e) var e = window.event;
  var code = e.keyCode ? e.keyCode : e.which;
  if (code == 27) escapeCount +=1;
  if (escapeCount == 2) {
    // stuff on second escape
  }
};
    Is there a better way to do this? Thanks
    Tags: None
    • RamananKalirajan
      Contributor
      • Mar 2008
      • 608
      #2
      Hi Akadeco,
      This is one way I have tried for your requirement.

      Code:
      <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="Ramanan Kalirajan">
<META NAME="Keywords" CONTENT="Demo">
<META NAME="Description" CONTENT="Demo">
<script type="text/javascript">
var lastChar = null;
var lastTime = null;

function checkReplicate(e)
{
	 if (!e) var e = window.event;
	 var code = e.keyCode ? e.keyCode : e.which;
  if(lastChar==null)
  {
     lastTime = new Date();
	 lastChar = code;
  }
  else
  {
     var diffTime = (new Date()) - lastTime;
	 if(lastChar==code)
	 {
		if(diffTime<1000)
		  alert("You have entered the same char twice");
		  return false;
	 }
	 else
	 {
		lastTime = new Date();
		lastChar = code;
	 }
  }
  return true;
}
</script>
</HEAD>
<BODY>
<input type="text" onkeydown="return checkReplicate(event)">
</BODY>
</HTML>
      Thanks and Regards
      Ramanan Kalirajan

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