How to Restrict the Alphabets in textbox in cross Browser (javascript)

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C#

{
       var AsciiValue=event.keyCode||event.charcode;
           if((AsciiValue>=48 && AsciiValue<=57) || (AsciiValue==8 || AsciiValue==127))
               event.returnValue=true;
           else
               event.returnValue=false;
       }

i have used this code..It works at all browers.
but it doesn't work at FireFox.

Posted 2-Jul-13 22:03pm

King Fisher

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**Nirav Prabtani** · Answer 1 · 2013-07-02T22:12:00

Try this....:)

JavaScript

<script language="javascript">
         function blockChar() {
             var str = document.getElementById('txt').value;
             str = str.replace(/[^\d]*/g, '');
             document.getElementById('txt').value = str;
         }
    </script>

C#

<body onload="javascript:document.getElementById('txt').focus();">
    <input type="text" id='txt' onkeyup="blockChar();" />
</body>