Copy Text From One ASP.NET TextBox To Another

Here's a simple way of copying Text From One ASP.NET Text Box to Another as the user types, using JavaScript

Add the following TextBox to your page


<asp:TextBox ID="txtOne" runat="server" onkeyup="OneTextToOther();"></asp:TextBox>


<asp:TextBox ID="txtTwo" runat="server"></asp:TextBox>




Now add the following JavaScript in the <head> section of your page


<head>


    <title></title>


    <script type="text/javascript">


        function OneTextToOther() {


            var first = document.getElementById('<%= txtOne.ClientID %>').value;


            document.getElementById('<%= txtTwo.ClientID %>').value = first;


        } 


    </script>


</head>


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