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Editorial Team
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Asked: 2026-05-21T19:36:22+00:00

I am maintaining a website written in C# with ASP.NET. At the bottom of

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I am maintaining a website written in C# with ASP.NET. At the bottom of a page is an iframe. When a user clicks a button, the source for that iframe is set with Javascript to a page on the server.

showLoadWidget();
document.getElementById("downloadFrame").src='SdrTrendDownload.aspx';
return false;

That page generates a file and allows the user to download it. Once the download file box pops up, I want to call hideLoadWidget() so the ‘Loading Data…’ overlay goes away. How do I detect when the download file box pops up?

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1 Answer

  1. Editorial Team

    You can’t detect that in addition this get more complicated depending on their security setting for the zone detected for your site

    I will suggest that you just wrap the call inside updatepanel and use the partial postback to trigger the download prompt and progress template for displaying the loading widget. Let .net and the browser deal with it.

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