How to Check Upper Case letter And Only Numeric And Alphabet Input In TextBox Validation Using JavaScript

TextBox with Only Alphabet Characters allowed.

    <script type="text/javascript">

        function valid(e) {

            var num;

            var chars;

            var check;

            if (window.event) {

                num = e.keyCode;

            }

            else if (e.which) {

                num = e.which;

            }

            chars = String.fromCharCode(num);

            check = /\d/;

            return !check.test(chars);

        }

    </script>

TextBox with Only Numeric Characters allowed.

<script language="Javascript" type="text/javascript">

      <!--

        function isNumeric(keyCode) {

            if (keyCode == 16)

                isShift = true;

            return ((keyCode >= 48 && keyCode <= 57 || keyCode == 8 ||

            (keyCode >= 96 && keyCode <= 105)) && isShift == false);

        }

         //-->

    </script>

TextBox Upper Case Letter.

<script type="text/javascript">

        function toUpper(txt) {

            document.getElementById(txt).value = document.getElementById(txt).value.toUpperCase();

            return true;

        }

    </script>

To call the textbox on onkeydown,onkeyup,onkeypress event, see below

<asp:TextBox ID="Txtcity1" runat="server" onkeyup="return toUpper(this.id)" onkeypress="return valid(event)"></asp:TextBox>

 <asp:TextBox ID="Txtpincode1" runat="server" onkeydown = "return isNumeric(event.keyCode)"></asp:TextBox>