Tutorial : How to use javascript to force users only put Number on textfield

by toy

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function numberOnly ( e )
    {
        var keynum;
        var keychar;
        var numcheck;

        if(window.event) // IE
        {
            keynum = e.keyCode;
        }
        else if(e.which) // Netscape/Firefox/Opera
        {
            keynum = e.which;
        }
       
        keychar = String.fromCharCode(keynum);
        numcheck = /\d|[\b]/;
       
        return numcheck.test(keychar);
    }