CODEWITHSUNDEEP
javascriptfiledownload
bruno2007
bruno2007

Reputation: 201

Javascript rename file on download

I want to be able to download a web file, but when the download dialog open, the filename is renamed.

Ex: File: http://<server>/<site>/test.txt

and when I click to download the file, download dialog open with the file name: test001.txt.

How can I achive that?

Upvotes: 20

Views: 53522

Answers (8)

rttmax
rttmax

Reputation: 394

If you want to use fetch API you can do it like so:

const downloadFile = async (url, fileName) => {
  const response = await fetch(url, { method: "GET" });
  const blob = await response.blob();
  const urlDownload = window.URL.createObjectURL(blob);
  const link = document.createElement("a");

  link.href = urlDownload;
  link.setAttribute("download", fileName);
  link.click();
};

// usage
downloadFile('../myFile.zip', 'whatever.zip')

Upvotes: 0

Guilherme Castro
Guilherme Castro

Reputation: 1

You can download the file using Fetch API, convert the fetch response into a Blob, create a blob URL from the blob, and then use an anchor with the download attribute (using the desired name) to download the file from the blob URL.

        <Link
            onClick={async() => {
                const url = `https://external-website.com/${file.s3Key}`;
                const downloadedFile = await fetch(url).then(response => {
                    if (response.ok) {
                        return response.blob();
                    }
                    else {
                        errorToast('It was not possible to download the file');
                        return undefined;
                    }
                });
                if (downloadedFile) {
                    const a = document.createElement('a');
                    const downloadUrl = window.URL.createObjectURL(downloadedFile as any);
                    a.href = downloadUrl;
                    a.download = file.filename; // use the name you want
                    a.click();
                }
            }}
            sx={{
                textDecoration: 'none',
                fontSize: 16,
                cursor: 'pointer'
            }}
        >
            Download
        </Link>

Upvotes: 0

Stephani Bishop
Stephani Bishop

Reputation: 1619

You can used the download attribute on a link tag <a href="http://server/site/test.txt" download="test001.txt">Download Your File</a>

However, when content-disposition header is set on the server response, it will ignore the download attribute and the filename will be set to the filename in the content-disposition response header

You can accomplish this using axios, or any other fetch by doing this:

const downloadAs = (url, name) => {
  Axios.get(url, {
    headers: {
      "Content-Type": "application/octet-stream"
    },
    responseType: "blob"
  })
    .then(response => {
      const a = document.createElement("a");
      const url = window.URL.createObjectURL(response.data);
      a.href = url;
      a.download = name;
      a.click();
    })
    .catch(err => {
      console.log("error", err);
    });
};

usage: 

downloadAs('filedownloadlink', 'newfilename');

Note: if your file is large, it will look like it is not doing anything until the whole file has been downloaded, so make sure you show some message or some indication to the user to let them know it is doing something

Upvotes: 15

Dmitry Pashkevich
Dmitry Pashkevich

Reputation: 13536

As InviS suggests, now there's a download attribute on links.

Example:

<a href="http://server/site/test.txt" download="test001.txt">Download Your File</a>

Upvotes: 25

ValeriiVasin
ValeriiVasin

Reputation: 8716

Use download attribute of the link. But it works only in Chrome browser :)

Upvotes: 1

Truesky
Truesky

Reputation: 221

If what you want is to return a continuous type of file name, you have to write a script that will keep track of that and provide that file back to the user. One way is using plain PHP, or something more advanced if it is several files at a time, possibly a cURL call in php so it can generate several different files. I am guessing that is what you are looking on doing, but you can't have the file name changed dynamically on the save box in that sense, you return the savename.txt filename.

Upvotes: 0

Rob W
Rob W

Reputation: 349222

This effect is accomplished by sending an additional header. You can use PHP, for example, to achieve this:

URLs can be rewritten using .htaccess, (internally) redirecting the request to a PHP file. I will show a simple hard-coded example, of how the header can be set:

<?php
    header('Content-type: text/plain');
    header('Content-Disposition: attachment; filename="test001.txt"');
    readfile('files/test.txt');
     //assuming that the files are stored in a directory, not in a database
?>

Upvotes: 2

Michael Sandino
Michael Sandino

Reputation: 1968

You can't do that in Javascript. The "Save to"-dialog is openend by the browser and you can't access that through JS, it's a standard-dialog from the OS.

Your server must provide the file with the desired name before the user clicks on the download-link.

What's the reason that you want to rename the downloaded file anyway?

Upvotes: 0

Related Questions