Downloading Files Using Ajax and Javascript

  1. When a client makes a request through XMLHttpRequest, the information is sent to the server.
  2. The server compiles a CSV file and sends it back as the output stream of the response to the client.

Next, the client's browser should display a download dialog box with options to save, open, or cancel the downloaded file. Since the content type is plain text from the server and the content disposition is not set, can we use JavaScript to create a file and prompt the user for download?

I realize this question may seem silly, but I have no other choice but to proceed in this manner.

Although making changes on the server side would only take a minute, I need to handle it on the client side. The responseText property of the XMLHttpRequest object will be plain text, and I need to prompt the user for downloading the text file.

Is this achievable?

javascriptajax

Answer №1

As far as I know, there isn't a direct way to do that. However, you could achieve the desired outcome by utilizing location.href for requesting the server-side file or using a form if POST data is required. By setting the appropriate headers like Content-Disposition: attachment (and possibly another one), you can prompt the browser to download the response instead of displaying it.

Alternatively, consider employing a hidden iframe. This method allows you to maintain a sleek "Loading, please wait" feature on the main page while fetching the file in the background.

Answer №2

It is theoretically feasible through the utilization of Data URI's.

<a download = "myfile.csv" href="data:application/octet-stream;charset=YOURCHARSET;base64,BASE64filecontent">Create</a>

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