Amit Work Desk : Wordpress Blog for Websites Development: How to add line numbers in textarea?

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<style type="text/css">
#codeTextarea{
   width:500px;
   height:510px;
}
.textAreaWithLines{
   font-family:courier;
   border:1px solid #F00;

}
.textAreaWithLines textarea,.textAreaWithLines div{
   border:0px;
   line-height:120%;
   font-size:12px;
}
.lineObj{
   color:red;
}
</style>

<script type="text/javascript">

var lineObjOffsetTop = 2;

function createTextAreaWithLines(id)
{
   var el = document.createElement('DIV');
   var ta = document.getElementById(id);
   ta.parentNode.insertBefore(el,ta);
   el.appendChild(ta);

   el.className='textAreaWithLines';
   el.style.width = (ta.offsetWidth + 30) + 'px';
   ta.style.position = 'absolute';
   ta.style.left = '30px';
   el.style.height = (ta.offsetHeight + 2) + 'px';
   el.style.overflow='hidden';
   el.style.position = 'relative';
   el.style.width = (ta.offsetWidth + 30) + 'px';
   var lineObj = document.createElement('DIV');
   lineObj.style.position = 'absolute';
   lineObj.style.top = lineObjOffsetTop + 'px';
   lineObj.style.left = '0px';
   lineObj.style.width = '27px';
   el.insertBefore(lineObj,ta);
   lineObj.style.textAlign = 'right';
   lineObj.className='lineObj';
   var string = '';
   for(var no=1;no<200;no++){
      if(string.length>0)string = string + '<br>';
      string = string + no;
   }

   ta.onkeydown = function() { positionLineObj(lineObj,ta); };
   ta.onmousedown = function() { positionLineObj(lineObj,ta); };
   ta.onscroll = function() { positionLineObj(lineObj,ta); };
   ta.onblur = function() { positionLineObj(lineObj,ta); };
   ta.onfocus = function() { positionLineObj(lineObj,ta); };
   ta.onmouseover = function() { positionLineObj(lineObj,ta); };
   lineObj.innerHTML = string;

}

function positionLineObj(obj,ta)
{
   obj.style.top = (ta.scrollTop * -1 + lineObjOffsetTop) + 'px';


}

</script>

</head>
<body>
<form>
<textarea id="codeTextarea">

</textarea>
</form>
<script type="text/javascript">
createTextAreaWithLines('codeTextarea');
</script>
</body>
</html>

How to add line numbers in textarea?

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