Acquiring the ClientID from a user control embedded within the application

On one of my web pages, I have set up the following:

<%@ Register Src="MyLocationControl.ascx" TagName="MyLocationControl" TagPrefix="uc3" %>

Inside MyLocationControl.ascx, there is a textbox field that will contain hidden values such as name, address, and state.

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="MyLocationControl.ascx.cs" Inherits="MyLocationControl" %>
<asp:TextBox ID="uxMyLocationDescription" runat="server" Rows="4" TextMode="MultiLine" ReadOnly="true" Width="225px"/>
<asp:HiddenField ID="MyLocationIDField" runat="server" Visible="true" ClientIDMode="Static" />

In the .cs file, there is a section like this:

public int LocationID
{
    get { return this.MyLocationIDField.Value == String.Empty ? 0 : Convert.ToInt32(this.MyLocationIDField.Value); }
    set { this.MyLocationIDField.Value = value.ToString(); }
}

I am having trouble accessing the clientID to assign a value to it.

document.getElementById('<%=uc3_MyLocationIDField.ClientID %>').value = "My Value";

However, I can interact with the textbox using the following code...

document.getElementById('MainContentPlaceHolder_uxReservationControl_uxRentalLocation_uxRentalLocationDescription').value = "Put something here";

Could you please help me understand what I might be overlooking?

Answer №2

For those utilizing ASP.NET 4 or later with only one control to access, John's method will suffice.

If not, there is still a way to make it work. The issue with this approach:

document.getElementById('<%=uc3_MyLocationIDField.ClientID %>').value = "My Value";

is that you are attempting to reach the server-side control - MyLocationIDField - using its generated ClientID - uc3_MyLocationIDField. This won't be successful, as the generated ID may vary each time it's rendered.

The purpose of using the <%= .. %> syntax is to reference server-side code, which should ideally work, but -

document.getElementById('<%=MyLocationIDField.ClientID %>').value = "My Value";

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