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accept only numeric data from keyboard in javascript

/ Published in: JavaScript
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Copy this code and paste it in your HTML 
  1. <HTML>
  2.    <HEAD>
  3.    <SCRIPT language=Javascript>
  4.       <!--
  5.       function isNumberKey(evt)
  6.       {
  7.          var charCode = (evt.which) ? evt.which : event.keyCode
  8.          if (charCode > 31 && (charCode < 48 || charCode > 57))
  9.             return false;
  10.  
  11.          return true;
  12.       }
  13.       //-->
  14.    </SCRIPT>
  15.    </HEAD>
  16.    <BODY>
  17.       <INPUT id="txtChar" onkeypress="return isNumberKey(event)" type="text" name="txtChar">
  18.    </BODY>
  19. </HTML>

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