How Can I Download Excel Files Using AJAX in an MVC Application?

Downloading Excel Files via AJAX in MVC Applications

Many MVC applications need to generate Excel files from submitted form data. Directly returning an Excel file from an AJAX call isn't practical.

The best solution uses AJAX to send form data to the server. The server creates the Excel file and stores its path or filename (e.g., in TempData or within the JSON response).

The AJAX call receives this path or filename. A redirect then triggers a separate controller action to retrieve the file and initiate the download.

Here's a breakdown of the process:

1. AJAX Request: The form submission handler makes an AJAX call to a server-side action responsible for Excel file generation. Form data is included in the request.

2. Server-Side Action (Excel Generation): This action receives the form data, generates the Excel file, and stores its location (path or filename) – either in TempData or by returning it in the JSON response.

3. AJAX Response: The AJAX call receives the file's location (path or filename) from the server.

4. AJAX Success Handler: The success handler redirects the browser to a dedicated controller action designed for file downloads. The file's location is passed as a parameter.

5. Download Controller Action: This action receives the file's location, retrieves the file from TempData or the file system, and sets the appropriate HTTP headers to trigger the download.

This method ensures smooth file downloads without creating unnecessary files on the server and without interfering with other form actions.

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