Properly referencing controls in ASP.NET user controls in JavaScript

Question

I have an ASP.NET user control that contains a text box control and a button control. This user control will be added to my web-page many times. I need to have a piece of

Answer 1

You can use ClientId property of controls (it's uniquely identifies control on the client side) and make something like that:

<asp:TextBox runat="server" ID="myTextBox" />
<asp:Button runat="server" ID="myButton" Text="click" />

<script language="javascript" type="text/javascript">
    document.getElementById("<%=myTextBox.ClientID %>").onclick = function() {
        document.getElementById("<%=myButton.ClientID %>").disabled = "disabled";
    }
</script>

Also refer to this document: Client Script in ASP.NET Web Pages, section Referencing Server Controls in Client Script