Question

Recently, I upgraded my solution to 4.0 and everything seems to have upgraded smoothly but for ASP.NET AJAX.

I have an UpdatePanel like so:

<asp:UpdatePanel ID="pnlAdvSearch" UpdateMode="conditional" runat="server">
  <ContentTemplate>  
      <asp:Button ID="btnHidden" Runat="server" OnClick="btnHidden_Click"
              ClientIDMode="Static"/>
  </ContentTemplate>
  <Triggers>
      <asp:AsyncPostBackTrigger ControlID="btnHidden" EventName="Click"/>
  </Triggers>
</asp:UpdatePanel>

I have a type-ahead textbox which triggers the btnHidden_Click event on Click/Enter etc. I’m calling the following method on textbox click/enter.

  function getSelectionId() {     
      __doPostBack(
          '<%=btnHidden.ClientID%>',
          document.getElementById('<%=txtLocation.ClientID %>').value
      );
      theForm.__EVENTARGUMENT.value = "";
  }

I can see a postback happening and the Page_Load executing. However, the server-side btnHidden_Click never gets fired. I do not want to disable event-validation at the page-level. What am I doing wrong here? 🙁

Answer 1

This is what I ended up doing on Page_Load.

            if (Page.Request.Params.Get("__EVENTTARGET") == "btnHidden") //Workaround hack for AsyncPostBackTrigger fail
                this.btnHidden_Click(null, null);

When an async postback happens, I just fire the event explicitly. Kinda hacky but not worth spending any more time on it 🙂