JavaScript validation for special character

Validate special character in text box using  java script 

 <script>   
     function IsAlphaNumeric(e) {  
       var keyCode = e.keyCode == 0 ? e.charCode : e.keyCode;  
       var ret = ((keyCode >= 48 && keyCode <= 57) || (keyCode >= 65 && keyCode <= 90)  || (keyCode >= 97 && keyCode <= 122)|| (keyCode == 127) || (keyCode == 8 ) || (keyCode == 32 ));
       document.getElementById("error").style.display = ret ? "none" : "inline";  
       return ret;  
     }  
 </script>  
  Alphanumeric value:  
   <input type="text" id="text1" onkeypress="return IsAlphaNumeric(event);" ondrop="return false;"  
     onpaste="return false;" />  
   <span id="error" style="color: Red; display: none">* Special Characters not allowed</span>  

Live Demo:--

Alphanumeric value: * Special Characters not allowed