Using ASP.NET page: executing Javascript function upon receiving file download response from the server

I am facing a situation with my ASP.NET page where the server returns either a new page or a file for download after a request is made. I would like to display a "Processing..." message on the screen while the data is being retrieved from the server.

It's easy to call JavaScript when the user hits submit, but the page reload on Postback hides any "Processing..." indicators that are shown (such as DIVs popping up at the top of the page).

The main issue arises when the data returned by the server is a file instead of a web page. How can I detect when the server starts returning the data so that I can execute JavaScript to remove the "Processing" indicator? Is this even possible, especially when the response is of a different MIME type? In what scenarios would it be feasible?

javascriptasp.netpostback

Answer №1

There are different approaches to achieve what you're aiming for using timers and assumptions, but to truly accomplish the task as described, it's essential to continuously query the server for confirmation that the download has been completed.

One effective method would be to send the file using Response.WriteFile, and then store a flag in a database or file system to signify that the transaction is finished. Meanwhile, the client script can continuously check the server for updates, while the server response verifies the status by checking for the presence of the flag denoting that the download has taken place.

The crucial aspect here is to have precise control over the download process itself; simply redirecting to the file will not provide the necessary level of oversight. If you require further guidance on implementing any of these steps, feel free to reach out for more detailed instructions.

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