Is there a way to use javascript to generate a file based on user input and provide it as a download without storing it on the server? For instance, imagine a scenario where a user is using an application and they want to download their work by clicking a "download" button. How can we ensure that a file is created containing their work and starts downloading in the browser? Additionally, how can we give this file a custom name?
Downloading files in the browser solely through Javascript is not possible. The server must be involved in the process to serve the file for download.
To achieve this, you can generate the data in the browser, send it to the server, and then have the client initiate the download from there. While it may seem cumbersome, it ensures security and proper handling of downloads. JavaScript cannot directly trigger downloads; instead, it can request the server to provide the file, which can then prompt the user for a download or perform an automatic download based on browser settings.
If you want more information on this topic, check out these helpful answers:
How to Use Content-disposition to Force a File Download?
How to Implement Content-Disposition: attachment?
Yes, you can achieve this functionality right now. The method involves inserting your data into an anchor tag's href attribute and then triggering it. I provide a working example below for downloading a file, although the filename portion may not function as expected. Essentially, the code takes some data, places it in an anchor tag (preferably a hidden one that is unused), and then activates it to initiate the download. Check out the code snippet:
var fetchFile = function(content) {
var link;
link = document.getElementById("hiddenAnchor");
link.download = "desired_filename.extension";
link.href = "data:text/csv;base64," + window.btoa(JSON.stringify(content));
window.open($("#hiddenAnchor").attr("href"), "desired_filename.extension");
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