A control with ID could not be found for the trigger in UpdatePanel

I have an update panel that has UpdateMode of Conditional and ChildrenAsTriggers set to false. I only want a few controls to cause an asynchronous postback:

<asp:UpdatePanel ID="updPnlMain" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false">
<ContentTemplate>

      // ...
      <asp:Repeater ID="rptListData" runat="server">
          <ItemTemplate>
              <asp:Button ID="btnAddSomething" runat="server" OnClick="btnAddSomething_Click" />
          </ItemTemplate>
      </asp:Repeater>
      // ...
</ContentTemplate>
<Triggers>
    <asp:AsyncPostBackTrigger ControlID="btnAddSomething" EventName="Click" />
</Triggers>
</asp:UpdatePanel>

I am getting the following error when I try and load this page:

A control with ID 'btnAddSomething' could not be found for the trigger in UpdatePanel 'updPnlMain'.

Since my btnAddSomething control is in a repeater and might not be there right away it acts like it is nonexistent. How can I get around this?

Contents hide

Answers:

Method 1

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

Because your control is in the repeater control and it is out of scope to the Trigger collection. By the way you don’t need to add trigger because your button control is already in the UpdatePanel, it will update when you click the button.

Edit: There is a solution if you really want to update your updPnlMain updatepanel. You can put in another updatepanel and put your button in that panel. e.g.

<asp:UpdatePanel ID="updButton" runat="server" UpdateMode="Conditional">
  <asp:Button ID="btnAddSomething" runat="server" OnClick="btnAddSomething_Click" />
</ContentTemplate>

and then simply call the updPnlMain.Update(); method in btnAddSomething_Click event.

It will actually do what you are looking for 🙂

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

0 0 votes

Article Rating