allowing only alphabets in text box using java script

Solution 1:

<html>
<head>
    <title>allwon only alphabets in textbox using JavaScript</title>
    <script language="Javascript" type="text/javascript">

        function onlyAlphabets(e, t) {
            try {
                if (window.event) {
                    var charCode = window.event.keyCode;
                }
                else if (e) {
                    var charCode = e.which;
                }
                else { return true; }
                if ((charCode > 64 && charCode < 91) || (charCode > 96 && charCode < 123))
                    return true;
                else
                    return false;
            }
            catch (err) {
                alert(err.Description);
            }
        }

    </script>
</head>
<body>
    <table align="center">
        <tr>
            <td>
                <input type="text" onkeypress="return onlyAlphabets(event,this);" />
            </td>
        </tr>
    </table>
</body>
</html>

Solution 2:

From kosare comments, i have create an demo http://jsbin.com/aTUMeMAV/2/

HTML

      <form name="f" onsubmit="return onlyAlphabets()">
         <input type="text" name="nm">
         <div id="notification"></div>
         <input type="submit">
      </form>

javascript

  function onlyAlphabets() {

  var regex = /^[a-zA-Z]*$/;
  if (regex.test(document.f.nm.value)) {

      //document.getElementById("notification").innerHTML = "Watching.. Everything is Alphabet now";
      return true;
  } else {
      document.getElementById("notification").innerHTML = "Alphabets Only";
      return false;
  }


}