Develop Reference

How to force file download on Instagram and Tik Tok in-app browsers

This works totally fine in most browsers:
<a href="file url" target="_blank" download>Click to download</a>
When someone clicks, the file is downloaded.
But when someone is using the Instagram or Tik Tok in-app browser the file is opened on the browser and unable to be downloaded.

<a download="name_of__file" href="path/to/the//file"> This will do</a>
This should do, if you know the URLs. Else it is much more complicated
From the web
function downloadFile(data, fileName, type="text/plain") {
// Create an invisible A element
const a = document.createElement("a");
a.style.display = "none";
document.body.appendChild(a);
// Set the HREF to a Blob representation of the data to be downloaded
a.href = window.URL.createObjectURL(
new Blob([data], { type })
);
// Use download attribute to set set desired file name
a.setAttribute("download", fileName);
// Trigger the download by simulating click
a.click();
// Cleanup
window.URL.revokeObjectURL(a.href);
document.body.removeChild(a);
}

Download pdf without opening in browser

I want to download pdf file directly without viewing, i have tries following things till now but nothing is helping.
1- window.open("https://s3-link1.pdf", 'Download');
2- <a href="https://s3-link1.pdf" download>Link</a>
Link - https://s3-link1.pdf
Assume my domain is https://www.somedomain.com
I somewhere read we can't download cross-origin files. content-disposition header is required to be passed from backend. I am puzzled here. Another csv file of cross-origin is being downloaded easily.
https://s3-link2.csv
I just need to download pdf file using javascript. Please guide me.

Try with fetch.
fetch("https://s3-link1.pdf", {
method: 'GET'
}).then(resp => resp.blob())
.then(blob => {
const url = window.URL.createObjectURL(blob);
const a = document.createElement('a');
a.style.display = 'none';
a.href = url;
a.download = "name"; // the filename you want
document.body.appendChild(a);
a.click();
window.URL.revokeObjectURL(url);
})

Option 1:
with jQuery you can try this:
$.get("https://s3-link1.pdf", function (result)
{
var blob = new Blob([result]);
var link = document.createElement('a');
link.href = window.URL.createObjectURL(blob);
link.download = "myFileName.pdf";
link.click();
});
Option 2:
The download attribute works in all modern browsers, including MS Edge, but not Internet Explorer.
In the latest versions of Chrome, you cannot download cross-origin files (they have to be hosted on the same domain).
<a href="https://s3-link1.pdf" download>Download PDF</a>
Find more about it here on this blog: https://actualwizard.com/html-force-download-file

How can I download a pdf from a url using javascript?

I need to download pdf's from one of our online resources.There is no built in function to batch download.The only way to do it is to navigate to each pdf file, click to open, then click download.
There are several thousand files and this would take a very long time to do.
I got around this in the past using javascript. I gathered all the links to the pdfs, put them in a csv, and had the code loop through each link, download, and move onto the next link.
Unfortunately, I have lost that code and my efforts to recreate it have been unsuccessful.
I have tried everything in this article: How to download PDF automatically using js?
I have tried the code from this article (which I'm pretty sure is what I did before): https://www.convertplug.com/plus/docs/download-pdf-file-forcefully-instead-opening-browser-using-js/
This is what I think should work...per the second article I referenced above
function download_file(fileURL, fileName) {
var link = document.createElement('a');
link.href = fileURL;
link.download = 'file.pdf';
link.dispatchEvent(new MouseEvent('click'));
}
var fileURL = "link/to/pdf";
var fileName = "test.pdf";
download(fileURL,fileName);
The code above is just to test download one file from a hardcoded URL. If it worked as intended, when the page is loaded, it should download the pdf from the provided url. Instead, it doesn't do anything on load or refresh.
Any suggestions?

Please check
https://stackoverflow.com/a/18983688/6923146
click me
Another one
https://stackoverflow.com/a/45905238/6923146
function download(url, filename) {
fetch(url).then(function(t) {
return t.blob().then((b)=>{
var a = document.createElement("a");
a.href = URL.createObjectURL(b);
a.setAttribute("download", filename);
a.click();
}
);
});
}
download("https://get.geojs.io/v1/ip/geo.json","geoip.json")
download("data:text/html,Hello Developer!", "HelloDeveloper.txt");
I hope it helpfull
https://www.convertplug.com/plus/docs/download-pdf-file-forcefully-instead-opening-browser-using-js/

You must add link element to DOM
function download_file(fileURL, fileName) {
var link = document.createElement('a');
link.href = fileURL;
link.download = fileName;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}
var fileURL = "https://cdn.sstatic.net/clc/img/jobs/bg-remote-header-sm.png";
var fileName = "test.pdf";
download_file(fileURL, fileName); // fix function name
Link must be in same origin
The download attribute on anchor was ignored because its href URL has a different security origin.

JavaScript changing default file name?

How would I go about changing the name of a clip that is going to be downloaded by the client on a website? Each video clip currently downloaded is a default name how do I go about customising it?

Yes, you can change file name as per your own logic. and will be download in client browser as per following logic :
var blob = b64toBlob(b64Data, contentType, false);
var blobUrl = URL.createObjectURL(blob);
var a = document.createElement("a");
document.body.appendChild(a);
a.style.display = 'none'
a.href = blobUrl;
a.download = fileName;
a.click();
window.URL.revokeObjectURL(blobUrl);
FileName can be set as per your own logic and append file extension
b64Data = your file's binary data, contentType = content type of your file.
for example for image it will be "data:image/png;base64,"

Javascript - Change/convert image data url to file url in ionic 2

Is possible to change or convert the data url of image to file url ?
For example, I got image from the link but the data was very long such as
data:image/x-icon;base64,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
So How can convert it to be such as
file:///storage/emulated/..../image1.jpg

You can replace the MIME type of a valid data URI with "application/octet-stream", set value at .href of <a> element, set download attribute value to "image1.validExtension", append element to document.body, call .click() on a element
var stream = validDataURI.replace(/[^:][\w/-]+(?=;|,)/, "application/octet-stream");
var a = document.createElement("a");
a.href = stream;
a.download = "image1.validExtension";
document.body.appendChild(a);
a.click();