LoadingPanel is not giving an error message (Microsoft JScript runtime error: Sys.InvalidOperationException: A Control in already associated with the element)

[Fouad Kayali]

Hi all,

I am using RadAjaxLoadingPanel and RadAjaxPanel with a Button which takes long time processing (Communicating with external machine), this is the code.

<telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" Runat="server">
      <img alt="Loading..." src="loading.gif">
</telerik:RadAjaxLoadingPanel>

<telerik:RadAjaxPanel ID="RadAjaxPanel1" LoadingPanel="RadAjaxLoadingPanel1">
      <asp:Button ID="btn" runat="server" OnClick="btnClick" Text="Clieck here" />
</telerik:RadAjaxPanel>

protected void btnClick(object sender, EventArgs e)
{
      Foo() // function takes long time
}

After pressing this button it shows me this error message
Microsoft JScript runtime error: Sys.InvalidOperationException: A Control in already associated with the element

Is there anyway else to show loading image?????

another thing, that I tried to show loading with Gridview but it doesn't come. how to show loading with the GridView events???

Thank in advance

[Maria Ilieva]

Hi Fouad,

Could you please test the application by using regular asp Update Panel instead of radAjaxPanel?Also please elaborate a little bit more on the issue you are facing. Does the error appear if the RadAjaxLoadingPanel is removed from the page?

Kind regards,
Maria Ilieva
the Telerik team

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[dlewis]

I've got the exact same problem and:

1.  I'm using the UpdatePanel
2.  The Error disappears when "RadAjaxLoadingPanel is removed from the page"

[Maria Ilieva]

Hello,

Could you please open a regular support ticket and send us runnable application which demonstrates the error. We will test it locally and advise you further.


Sincerely yours,
Maria Ilieva
the Telerik team