How Can I Dynamically Track Browser Download Completion for Client-Side Generated Files?

Generate Dynamically-Generated File and Detect Browser Download Reception

When enabling file downloads from dynamically-generated content, the subsequent browser behavior can pose challenges in tracking download completion. This issue presents a need to monitor browser actions to hide waiting indicators appropriately.

The provided solution employs JavaScript client-side scripting:

1. Generate a unique token: Create a random token to uniquely identify the download request.
2. Submit the download request: Include the token in the request through a GET/POST field.
3. Display loading indicator: Show the "waiting" indicator to inform the user.
4. Start a timer: Check for a cookie named "fileDownloadToken" at regular intervals (e.g., every second).
5. Hide indicator on match: If the cookie exists and matches the token, hide the "waiting" indicator.

Correspondingly, the server-side logic:

1. Retrieve token from request: Look for the GET/POST token within the request.
2. Set cookie on token availability: If a non-empty token exists, drop a cookie named "fileDownloadToken" with its value set to the token.

This approach provides browser-specific compatibility without requiring temporary file creation on the server.

Client-Side Implementation (JavaScript):

[JavaScript code provided in the original response]

Example Server-Side Implementation (PHP):

[PHP code provided in the original response]

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