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JavaScript Function for Add only Number in Textbox

  1.   <input type="text" id="contactno" name="contactno" maxlength="10" , onkeypress="return onlyNos(event,this);">   
  2.   
  3. <script language="JavaScript">  
  4.    function onlyNos(e, t) {  
  5.             try {  
  6.                 if (window.event) {  
  7.                     var charCode = window.event.keyCode;  
  8.                 }  
  9.                 else if (e) {  
  10.                     var charCode = e.which;  
  11.                 }  
  12.                 else { return true; }  
  13.                 if (charCode > 31 && (charCode < 48 || charCode > 57)) {  
  14.                     return false;  
  15.                 }  
  16.                 return true;  
  17.             }  
  18.             catch (err) {  
  19.                 alert(err.Description);  
  20.             }  
  21.         }  
  22.   
  23. </script>