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Javascript




<html>
<head>
<title>Dynamic textbox</title>
<script language="javascript">
function maketextbox(nooftextbox)
{
    my_div.innerHTML ='';
    var j  = nooftextbox;
    for(i=1;i<=j;i++)
    {
    my_div.innerHTML = my_div.innerHTML +'<input name = "mytext' + i + '" type="text" id = "mytext' + i + '" />'
    }
}
</script>
</head>
<body>

<select name="s1" onchange="maketextbox(this.value)">
    <option value="0">Select</option>
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
    <option value="5">5</option>
</select>
<div id="my_div"></div>

</body>

 For Validation of Textbox 
function validate()
   {
      var boxes = $("#details input:text.classname");
      boxes.each(function(){
          var currentVal = $(this).val();
          // do your validation here
      });
   }                                    

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