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I have a page that allows the user to download a dynamically-generated file. It takes a long time to generate, so I'd like to show a "waiting" indicator. The problem is, I can't figure out how to detect when the browser has received the file so that I can hide the indicator. I'm requesting a hidden form, which POSTs to the server, and targets a hidden iframe for its results. This is, so I don't replace the entire browser window with the result. I listen for a "load" event on the iframe, hoping that it will fire when the download is complete. I return a " Content-Disposition: attachment " header with the file, which causes the browser to show the "Save" dialog. But the browser doesn't fire a "load" event in the iframe. One approach I tried is using a multi-part response. So it would send an empty HTML file, as well as the attached downloadable file. For example: Content-type: multipart/x-mixed-replace;boundary="abcde" --abcde Content-type: text/html --abcde Content-type: application/vnd.fdf Content-Disposition: attachment; filename=foo.fdf file-content --abcde This works in Firefox; it receives the empty HTML file, fires the "load" event, and then shows the "Save" dialog for the downloadable file. But it fails on Internet Explorer and Safari ; Internet Explorer fires the "load" event, but it doesn't download the file, and Safari downloads the file (with the wrong name and content-type) and doesn't fire the "load" event. A different approach might be to call to start the file creation, poll the server u

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