With JS, jQuery, how do I save an AJAX response to a (text) file?

Question

It seems that this question is being asked periodically, and the general answer is: "You should not do this with AJAX anyway. Just set the window location to a file."

But I'm trying to request a file that does not actually exist on the server anywhere. It is dynamically generated (according to Django) based on the GET / POST context parameters. The file I want to receive through AJAX and then save it to the client machine is a text file (csv).

Currently, I can get the text on the client machine (and check this by seeing it during registration or notification), but cannot then figure out how to save this text in a file inside the AJAX fn success callback.

Essentially, is it possible, can JS do it? That is, to open the file save dialogs for "files" that are actually AJAX response text?

Answer 1

From the point of view of the browser, it does not matter if the file exists or not, it is just a resource on the server that it is requesting. I think you will need to make some version of "Just set the location of the window to a file." If you set the content type in the title to what the browser does not recognize, I believe that it will ask the user if they want to save it.

Answer 2

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<button id="Save">Save</button>
<img src="MakeThumbnail.ashx?Image=1.jpg" id="imgCrop">

$("#Save").click(function (e) {
    url = $("#imgCrop").attr("src")+"&Action=Save"
    e.preventDefault();  //stop the browser from following
    window.location.href = url;
});