tabindex is not working textbox which textbox is restrict alphabets using javascript how to solve

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my java script for restrict alphabet letters

XML

<script language="javascript" type="text/javascript">
        function CheckNumeric(e) {

            if (window.event) // IE
            {
                if ((e.keyCode < 48 || e.keyCode > 57) & e.keyCode != 8) {
                    event.returnValue = false;
                    return false;

                }
            }
            else { // Fire Fox
                if ((e.which < 48 || e.which > 57) & e.which != 8) {
                    e.preventDefault();
                    return false;

                }
            }
        }
    </script>

thanks

Posted 28-Mar-15 1:29am

Parazival

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Sebastiaan Meijerink · Answer 1 · 2015-03-28T02:13:00

The key code for the <TAB> is 9, you are catching that.
Excluding it form you're where should fix it.

To awnser you're question better.

The numbers go from keycode 48 to 57.
The alpabeth goes from 56 to 90

So to just include the numbers the if should surround just the alphabet, not all keys.
And if you just wan't letters, include the alpabet

JavaScript

if((e.which >= 48 && e.which <= 57)) {
   //This will only allow alphabet letters & all special keys 
   e.preventDefault();
   return false;
}

if((e.which >= 65 && e.which <= 90)) {
   //This will only allow numbers & all special keys 
   e.preventDefault();
   return false;
}