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jQuery to convert asp.net textbox text to uppercase or lowercase while typing

Introduction: In this article I am going to share how to automatically change text to upper or lower case while entering text in textbox using jquery.

jQuery to convert asp.net textbox text to uppercase or lowercase while typing


Description: Sometimes we want to restrict the user to enter text in specific case e.g. uppercase or lowercase . There are multiple ways to achieve this. Here I am sharing the trick using jquery. 

Implementation: Let’s create a demo page for demonstration purpose.

HTML Source
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            // Convert text to Upper Case
            $('#<%=txtUpperCase.ClientID%>').keyup(function () {
                this.value = this.value.toUpperCase();
            });
            // Convert text to Lower Case
            $('#<%=txtLowerCase.ClientID%>').keyup(function () {
                this.value = this.value.toLowerCase();
            })
        })
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <fieldset style="height: 80px; width: 345px;">
                <legend>Convert text to uppercase or lowercase while typing</legend>
                <table>
                    <tr>
                        <td>Text in upper case: </td>
                        <td>
                            <asp:TextBox ID="txtUpperCase" runat="server" /></td>
                    </tr>
                    <tr>
                        <td>Text in lower case: </td>
                        <td>
                            <asp:TextBox ID="txtLowerCase" runat="server" /></td>
                    </tr>
                </table>
            </fieldset>
        </div>
    </form>
</body>
</html>

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