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Initial call to UpdatePanel

I am using UpdatePaenl on asp.net page. It has a button to bring it up. I can show "Loading" when the button is clicked. Here's my problem: I need it to show "Loading" on the first page, not just when the button is clicked.

I would assume JavaScript would be used to trigger the UpdatePanel on the first page load.

Any ideas are appreciated. Thanks to

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You should be able to do this in javascript by setting up an event to fire after the page has loaded:

// Define the pg_Loaded() function as the handler for the PageLoaded event
Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(pg_Loaded);

var blnFirstPageVisit = true;

function pg_Loaded() 
{
    if (blnFirstPageVisit == true) 
    {
        // Display loading animation
        fnToggleLoading();

        // Trigger button postback event
        <asp:literal runat="server" id="ltlExecute" />

        // Prevent this from firing a second time after the postback completes
        blnFirstPageVisit = false;
    }
}

In ASP, set literal text like this:



ltlExecute.Text = ClientScript.GetPostBackEventReference(btnExecute, "")

More information exists on MSDN: http://msdn.microsoft.com/en-us/library/bb311028.aspx

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