Saving CSV file using blob in Safari - javascript

I have codes below to generate the download link so that users could download the .csv file on my site.
var link = document.createElement("a");
link.id = "csvDwnLink";
window.URL = window.URL || window.webkitURL;
var csv = "\ufeff" + CSV,
blob = new window.Blob([csv], {type: 'text/csv, charset=UTF-8'}),
csvUrl = window.URL.createObjectURL(blob),
filename = 'export.csv';
$("#csvDwnLink").attr({'download': filename, 'href': csvUrl});
$('#csvDwnLink')[0].click();
document.body.removeChild(link);
I hope the user could click the download link with csvUrl to download the cvs file.
It works on chrome. However, when I click the same link using Safari, it will directly show me the content of the csv file in the tab.
How do I solve this problem so that the safari will show the saving file window which user could select the path where they want to save the file instead of showing the content of the cvs file directly when I click the download link?
Hope someone could me some recommendations or alternative methods.
Thanks in advance!
== Updated ==
Find out solutions here
solution 1,
solution 2
The code will be:
var link = document.createElement("a");
link.id = "csvDwnLink";
document.body.appendChild(link);
window.URL = window.URL || window.webkitURL;
var csv = "\ufeff" + CSV,
csvData = 'data:attachment/csv;charset=utf-8,' + encodeURIComponent(csv),
filename = 'filename.csv';
$("#csvDwnLink").attr({'download': filename, 'href': csvData});
$('#csvDwnLink')[0].click();
document.body.removeChild(link);
Safari will download the file for the user, however, the file name will be unknown, probably it's because Safari don't support 'download' attribute yet as raphael mentioned.

I did a quick research - I looks like Safari does not support what you are trying to achieve.
The reason why your solution works in Chrome (and Firefox) is that they support the download attribute - Safari doesn't yet.

Safari 10.1+ supports "download" attribute. It should work now.
https://github.com/eligrey/FileSaver.js/issues/129#issuecomment-275221240

Related

Safari - download .CSV file instead of open it

Are there any solutions for downloading a .CSV file that generated on server instead of opening it on Safari ?
My system:
MAC OS X El Capitan 10.11.5
Safari 9.1.1
I used this method to download an .ICS file and it works document.location = <link to file>;. However when I applied it for downloading .CSV file, it just open the file on browser.
I also tried to use download attribute with the instructions from somewhere in stackoverflow but it still doesn't work
var link = $("<a />");
link.appendTo("body");
link.attr("id", "csvDwnLink");
window.URL = window.URL || window.webkitURL;
var csv = "\ufeff" + "col1;col2;col3",
blob = new window.Blob([csv], {type: 'text/csv, charset=UTF-8'}),
csvUrl = window.URL.createObjectURL(blob),
filename = 'export.csv';
link.attr({'download': filename, 'href': csvUrl, 'target': '_blank'});
$(link)[0].click();
the fiddle: http://jsfiddle.net/628mmkww/2/
Is anyone facing the same problem with me ?
Thanks.

How to fix javascript to change image file name from "download" to something else for example "test.png"? HTML [duplicate]

If for example you follow the link:
data:application/octet-stream;base64,SGVsbG8=
The browser will prompt you to download a file consisting of the data held as base64 in the hyperlink itself. Is there any way of suggesting a default name in the markup? If not, is there a JavaScript solution?
Use the download attribute:
<a download='FileName' href='your_url'>
The download attribute works on Chrome, Firefox, Edge, Opera, desktop Safari 10+, iOS Safari 13+, and not IE11.
Chrome makes this very simple these days:
function saveContent(fileContents, fileName)
{
var link = document.createElement('a');
link.download = fileName;
link.href = 'data:,' + fileContents;
link.click();
}
HTML only: use the download attribute:
<a download="logo.gif" href="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7">Download transparent png</a>
Javascript only: you can save any data URI with this code:
function saveAs(uri, filename) {
var link = document.createElement('a');
if (typeof link.download === 'string') {
link.href = uri;
link.download = filename;
//Firefox requires the link to be in the body
document.body.appendChild(link);
//simulate click
link.click();
//remove the link when done
document.body.removeChild(link);
} else {
window.open(uri);
}
}
var file = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7'
saveAs(file, 'logo.gif');
Chrome, Firefox, and Edge 13+ will use the specified filename.
IE11, Edge 12, and Safari 9 (which don't support the download attribute) will download the file with their default name or they will simply display it in a new tab, if it's of a supported file type: images, videos, audio files, …
According to RFC 2397, no, there isn't.
Nor does there appear to be any attribute of the <a> element that you can use either.
However HTML5 has subsequently introduced the download attribute on the <a> element, although at the time of writing support is not universal (no MSIE support, for example)
I've looked a bit in firefox sources in netwerk/protocol/data/nsDataHandler.cpp
data handler only parses content/type and charset, and looks if there is ";base64"
in the string
the rfc specifices no filename and at least firefox handles no filename for it,
the code generates a random name plus ".part"
I've also checked firefox log
[b2e140]: DOCSHELL 6e5ae00 InternalLoad data:application/octet-stream;base64,SGVsbG8=
[b2e140]: Found extension '' (filename is '', handling attachment: 0)
[b2e140]: HelperAppService::DoContent: mime 'application/octet-stream', extension ''
[b2e140]: Getting mimeinfo from type 'application/octet-stream' ext ''
[b2e140]: Extension lookup on '' found: 0x0
[b2e140]: Ext. lookup for '' found 0x0
[b2e140]: OS gave back 0x43609a0 - found: 0
[b2e140]: Searched extras (by type), rv 0x80004005
[b2e140]: MIME Info Summary: Type 'application/octet-stream', Primary Ext ''
[b2e140]: Type/Ext lookup found 0x43609a0
interesting files if you want to look at mozilla sources:
data uri handler: netwerk/protocol/data/nsDataHandler.cpp
where mozilla decides the filename: uriloader/exthandler/nsExternalHelperAppService.cpp
InternalLoad string in the log: docshell/base/nsDocShell.cpp
I think you can stop searching a solution for now, because I suspect there is none :)
as noticed in this thread html5 has download attribute, it works also on firefox 20 http://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#attr-hyperlink-download
The following Javascript snippet works in Chrome by using the new 'download' attribute of links and simulating a click.
function downloadWithName(uri, name) {
var link = document.createElement("a");
link.download = name;
link.href = uri;
link.click();
}
And the following example shows it's use:
downloadWithName("data:,Hello%2C%20World!", "helloWorld.txt")
No.
The entire purpose is that it's a datastream, not a file. The data source should not have any knowledge of the user agent handling it as a file... and it doesn't.
you can add a download attribute to the anchor element.
sample:
<a download="abcd.cer"
href="data:application/stream;base64,MIIDhTC......">down</a>
Using service workers, this is finally possible in the truest sense.
Create a fake URL. For example /saveAs/myPrettyName.jpg
Use URL in <a href, <img src, window.open( url ), absolutely anything that can be done with a "real" URL.
Inside the worker, catch the fetch event, and respond with the correct data.
The browser will now suggest myPrettyName.jpg even if the user opens the file in a new tab, and tries to save it there. It will be exactly as if the file had come from the server.
// In the service worker
self.addEventListener( 'fetch', function(e)
{
if( e.request.url.startsWith( '/blobUri/' ) )
{
// Logic to select correct dataUri, and return it as a Response
e.respondWith( dataURLAsRequest );
}
});
Look at this link:
http://lists.w3.org/Archives/Public/uri/2010Feb/0069.html
Quote:
It even works (as in, doesn't cause a problem) with ;base64 at the end
like this (in Opera at least):
data:text/plain;charset=utf-8;headers=Content-Disposition%3A%20attachment%3B%20filename%3D%22with%20spaces.txt%22%0D%0AContent-Language%3A%20en;base64,4oiaDQo%3D
Also there is some info in the rest messages of the discussion.
There is a tiny workaround script on Google Code that worked for me:
http://code.google.com/p/download-data-uri/
It adds a form with the data in it, submits it and then removes the form again. Hacky, but it did the job for me. Requires jQuery.
This thread showed up in Google before the Google Code page and I thought it might be helpful to have the link in here, too.
Here is a jQuery version based off of Holf's version and works with Chrome and Firefox whereas his version seems to only work with Chrome. It's a little strange to add something to the body to do this but if someone has a better option I'm all for it.
var exportFileName = "export-" + filename;
$('<a></a>', {
"download": exportFileName,
"href": "data:," + JSON.stringify(exportData, null,5),
"id": "exportDataID"
}).appendTo("body")[0].click().remove();
This one works with Firefox 43.0 (older not tested):
dl.js:
function download() {
var msg="Hello world!";
var blob = new File([msg], "hello.bin", {"type": "application/octet-stream"});
var a = document.createElement("a");
a.href = URL.createObjectURL(blob);
window.location.href=a;
}
dl.html
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8"/>
<title>Test</title>
<script type="text/javascript" src="dl.js"></script>
</head>
<body>
<button id="create" type="button" onclick="download();">Download</button>
</body>
</html>
If button is clicked it offered a file named hello.bin for download. Trick is to use File instead of Blob.
reference: https://developer.mozilla.org/de/docs/Web/API/File
(This answer has been made deprecated by newer technology, but will be kept here for historical interest.)
It's kind of hackish, but I've been in the same situation before. I was dynamically generating a text file in javascript and wanted to provide it for download by encoding it with the data-URI.
This is possible with minormajor user intervention. Generate a link right-click me and select "Save Link As..." and save as "example.txt". As I said, this is inelegant, but it works if you do not need a professional solution.
This could be made less painful by using flash to copy the name into the clipboard first. Of course if you let yourself use Flash or Java (now with less and less browser support I think?), you could probably find a another way to do this.
<a href=.. download=.. > works for left-click and right-click -> save link as..,
but <img src=.. download=.. > doesn't work for right-click -> save image as.. , "Download.jped" is suggested.
If you combine both:<a href=.. download=..><img src=..></a>
it works for left-click, right-click -> save link as.., right-click -> save image as..
You have to write the data-uri twice (href and src), so for large image files it is better to copy the uri with javascript.
tested with Chrome/Edge 88
var isIE = /*#cc_on!#*/false || !!document.documentMode; // At least IE6
var sessionId ='\n';
var token = '\n';
var caseId = CaseIDNumber + '\n';
var url = casewebUrl+'\n';
var uri = sessionId + token + caseId + url;//data in file
var fileName = "file.i4cvf";// any file name with any extension
if (isIE)
{
var fileData = ['\ufeff' + uri];
var blobObject = new Blob(fileData);
window.navigator.msSaveOrOpenBlob(blobObject, fileName);
}
else //chrome
{
window.requestFileSystem = window.requestFileSystem || window.webkitRequestFileSystem;
window.requestFileSystem(window.TEMPORARY, 1024 * 1024, function (fs) {
fs.root.getFile(fileName, { create: true }, function (fileEntry) {
fileEntry.createWriter(function (fileWriter) {
var fileData = ['\ufeff' + uri];
var blob = new Blob(fileData);
fileWriter.addEventListener("writeend", function () {
var fileUrl = fileEntry.toURL();
var link = document.createElement('a');
link.href = fileUrl;
link.download = fileName;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}, false);
fileWriter.write(blob);
}, function () { });
}, function () { });
}, function () { });
}
You actually can achieve this, in Chrome and FireFox.
Try the following url, it will download the code that was used.
data:text/html;base64,PGEgaHJlZj0iZGF0YTp0ZXh0L2h0bWw7YmFzZTY0LFBHRWdhSEpsWmowaVVGVlVYMFJCVkVGZlZWSkpYMGhGVWtVaUlHUnZkMjVzYjJGa1BTSjBaWE4wTG1oMGJXd2lQZ284YzJOeWFYQjBQZ3BrYjJOMWJXVnVkQzV4ZFdWeWVWTmxiR1ZqZEc5eUtDZGhKeWt1WTJ4cFkyc29LVHNLUEM5elkzSnBjSFErIiBkb3dubG9hZD0idGVzdC5odG1sIj4KPHNjcmlwdD4KZG9jdW1lbnQucXVlcnlTZWxlY3RvcignYScpLmNsaWNrKCk7Cjwvc2NyaXB0Pg==

downloading images through a javascript in Firefox

I have developed a simple web site which will download a image file form a server
in my web page I have a "download" button. When I click on it following is the code I used to download the image file:
var downloadLink = document.createElement("a");
downloadLink.href = $scope.urlValue2 + "&downloadName=" + fileName + ".jpg";
downloadLink.download = fileName+'.jpg';
downloadLink.type = 'image/jpg';
document.body.appendChild(downloadLink);
downloadLink.click();
This is working fine in chrome but in firefox this is not working. What might be the problem?
According to this website, the correct MIME type for JPEG images is image/jpeg
Try to replace 'image/jpg' with 'image/jpeg'

file extension after base64 in javascript [duplicate]

If for example you follow the link:
data:application/octet-stream;base64,SGVsbG8=
The browser will prompt you to download a file consisting of the data held as base64 in the hyperlink itself. Is there any way of suggesting a default name in the markup? If not, is there a JavaScript solution?
Use the download attribute:
<a download='FileName' href='your_url'>
The download attribute works on Chrome, Firefox, Edge, Opera, desktop Safari 10+, iOS Safari 13+, and not IE11.
Chrome makes this very simple these days:
function saveContent(fileContents, fileName)
{
var link = document.createElement('a');
link.download = fileName;
link.href = 'data:,' + fileContents;
link.click();
}
HTML only: use the download attribute:
<a download="logo.gif" href="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7">Download transparent png</a>
Javascript only: you can save any data URI with this code:
function saveAs(uri, filename) {
var link = document.createElement('a');
if (typeof link.download === 'string') {
link.href = uri;
link.download = filename;
//Firefox requires the link to be in the body
document.body.appendChild(link);
//simulate click
link.click();
//remove the link when done
document.body.removeChild(link);
} else {
window.open(uri);
}
}
var file = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7'
saveAs(file, 'logo.gif');
Chrome, Firefox, and Edge 13+ will use the specified filename.
IE11, Edge 12, and Safari 9 (which don't support the download attribute) will download the file with their default name or they will simply display it in a new tab, if it's of a supported file type: images, videos, audio files, …
According to RFC 2397, no, there isn't.
Nor does there appear to be any attribute of the <a> element that you can use either.
However HTML5 has subsequently introduced the download attribute on the <a> element, although at the time of writing support is not universal (no MSIE support, for example)
I've looked a bit in firefox sources in netwerk/protocol/data/nsDataHandler.cpp
data handler only parses content/type and charset, and looks if there is ";base64"
in the string
the rfc specifices no filename and at least firefox handles no filename for it,
the code generates a random name plus ".part"
I've also checked firefox log
[b2e140]: DOCSHELL 6e5ae00 InternalLoad data:application/octet-stream;base64,SGVsbG8=
[b2e140]: Found extension '' (filename is '', handling attachment: 0)
[b2e140]: HelperAppService::DoContent: mime 'application/octet-stream', extension ''
[b2e140]: Getting mimeinfo from type 'application/octet-stream' ext ''
[b2e140]: Extension lookup on '' found: 0x0
[b2e140]: Ext. lookup for '' found 0x0
[b2e140]: OS gave back 0x43609a0 - found: 0
[b2e140]: Searched extras (by type), rv 0x80004005
[b2e140]: MIME Info Summary: Type 'application/octet-stream', Primary Ext ''
[b2e140]: Type/Ext lookup found 0x43609a0
interesting files if you want to look at mozilla sources:
data uri handler: netwerk/protocol/data/nsDataHandler.cpp
where mozilla decides the filename: uriloader/exthandler/nsExternalHelperAppService.cpp
InternalLoad string in the log: docshell/base/nsDocShell.cpp
I think you can stop searching a solution for now, because I suspect there is none :)
as noticed in this thread html5 has download attribute, it works also on firefox 20 http://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#attr-hyperlink-download
The following Javascript snippet works in Chrome by using the new 'download' attribute of links and simulating a click.
function downloadWithName(uri, name) {
var link = document.createElement("a");
link.download = name;
link.href = uri;
link.click();
}
And the following example shows it's use:
downloadWithName("data:,Hello%2C%20World!", "helloWorld.txt")
No.
The entire purpose is that it's a datastream, not a file. The data source should not have any knowledge of the user agent handling it as a file... and it doesn't.
you can add a download attribute to the anchor element.
sample:
<a download="abcd.cer"
href="data:application/stream;base64,MIIDhTC......">down</a>
Using service workers, this is finally possible in the truest sense.
Create a fake URL. For example /saveAs/myPrettyName.jpg
Use URL in <a href, <img src, window.open( url ), absolutely anything that can be done with a "real" URL.
Inside the worker, catch the fetch event, and respond with the correct data.
The browser will now suggest myPrettyName.jpg even if the user opens the file in a new tab, and tries to save it there. It will be exactly as if the file had come from the server.
// In the service worker
self.addEventListener( 'fetch', function(e)
{
if( e.request.url.startsWith( '/blobUri/' ) )
{
// Logic to select correct dataUri, and return it as a Response
e.respondWith( dataURLAsRequest );
}
});
Look at this link:
http://lists.w3.org/Archives/Public/uri/2010Feb/0069.html
Quote:
It even works (as in, doesn't cause a problem) with ;base64 at the end
like this (in Opera at least):
data:text/plain;charset=utf-8;headers=Content-Disposition%3A%20attachment%3B%20filename%3D%22with%20spaces.txt%22%0D%0AContent-Language%3A%20en;base64,4oiaDQo%3D
Also there is some info in the rest messages of the discussion.
There is a tiny workaround script on Google Code that worked for me:
http://code.google.com/p/download-data-uri/
It adds a form with the data in it, submits it and then removes the form again. Hacky, but it did the job for me. Requires jQuery.
This thread showed up in Google before the Google Code page and I thought it might be helpful to have the link in here, too.
Here is a jQuery version based off of Holf's version and works with Chrome and Firefox whereas his version seems to only work with Chrome. It's a little strange to add something to the body to do this but if someone has a better option I'm all for it.
var exportFileName = "export-" + filename;
$('<a></a>', {
"download": exportFileName,
"href": "data:," + JSON.stringify(exportData, null,5),
"id": "exportDataID"
}).appendTo("body")[0].click().remove();
This one works with Firefox 43.0 (older not tested):
dl.js:
function download() {
var msg="Hello world!";
var blob = new File([msg], "hello.bin", {"type": "application/octet-stream"});
var a = document.createElement("a");
a.href = URL.createObjectURL(blob);
window.location.href=a;
}
dl.html
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8"/>
<title>Test</title>
<script type="text/javascript" src="dl.js"></script>
</head>
<body>
<button id="create" type="button" onclick="download();">Download</button>
</body>
</html>
If button is clicked it offered a file named hello.bin for download. Trick is to use File instead of Blob.
reference: https://developer.mozilla.org/de/docs/Web/API/File
(This answer has been made deprecated by newer technology, but will be kept here for historical interest.)
It's kind of hackish, but I've been in the same situation before. I was dynamically generating a text file in javascript and wanted to provide it for download by encoding it with the data-URI.
This is possible with minormajor user intervention. Generate a link right-click me and select "Save Link As..." and save as "example.txt". As I said, this is inelegant, but it works if you do not need a professional solution.
This could be made less painful by using flash to copy the name into the clipboard first. Of course if you let yourself use Flash or Java (now with less and less browser support I think?), you could probably find a another way to do this.
<a href=.. download=.. > works for left-click and right-click -> save link as..,
but <img src=.. download=.. > doesn't work for right-click -> save image as.. , "Download.jped" is suggested.
If you combine both:<a href=.. download=..><img src=..></a>
it works for left-click, right-click -> save link as.., right-click -> save image as..
You have to write the data-uri twice (href and src), so for large image files it is better to copy the uri with javascript.
tested with Chrome/Edge 88
var isIE = /*#cc_on!#*/false || !!document.documentMode; // At least IE6
var sessionId ='\n';
var token = '\n';
var caseId = CaseIDNumber + '\n';
var url = casewebUrl+'\n';
var uri = sessionId + token + caseId + url;//data in file
var fileName = "file.i4cvf";// any file name with any extension
if (isIE)
{
var fileData = ['\ufeff' + uri];
var blobObject = new Blob(fileData);
window.navigator.msSaveOrOpenBlob(blobObject, fileName);
}
else //chrome
{
window.requestFileSystem = window.requestFileSystem || window.webkitRequestFileSystem;
window.requestFileSystem(window.TEMPORARY, 1024 * 1024, function (fs) {
fs.root.getFile(fileName, { create: true }, function (fileEntry) {
fileEntry.createWriter(function (fileWriter) {
var fileData = ['\ufeff' + uri];
var blob = new Blob(fileData);
fileWriter.addEventListener("writeend", function () {
var fileUrl = fileEntry.toURL();
var link = document.createElement('a');
link.href = fileUrl;
link.download = fileName;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}, false);
fileWriter.write(blob);
}, function () { });
}, function () { });
}, function () { });
}
You actually can achieve this, in Chrome and FireFox.
Try the following url, it will download the code that was used.
data:text/html;base64,PGEgaHJlZj0iZGF0YTp0ZXh0L2h0bWw7YmFzZTY0LFBHRWdhSEpsWmowaVVGVlVYMFJCVkVGZlZWSkpYMGhGVWtVaUlHUnZkMjVzYjJGa1BTSjBaWE4wTG1oMGJXd2lQZ284YzJOeWFYQjBQZ3BrYjJOMWJXVnVkQzV4ZFdWeWVWTmxiR1ZqZEc5eUtDZGhKeWt1WTJ4cFkyc29LVHNLUEM5elkzSnBjSFErIiBkb3dubG9hZD0idGVzdC5odG1sIj4KPHNjcmlwdD4KZG9jdW1lbnQucXVlcnlTZWxlY3RvcignYScpLmNsaWNrKCk7Cjwvc2NyaXB0Pg==

Setting filename using encodeURIComponent() to let user download data file [duplicate]

If for example you follow the link:
data:application/octet-stream;base64,SGVsbG8=
The browser will prompt you to download a file consisting of the data held as base64 in the hyperlink itself. Is there any way of suggesting a default name in the markup? If not, is there a JavaScript solution?
Use the download attribute:
<a download='FileName' href='your_url'>
The download attribute works on Chrome, Firefox, Edge, Opera, desktop Safari 10+, iOS Safari 13+, and not IE11.
Chrome makes this very simple these days:
function saveContent(fileContents, fileName)
{
var link = document.createElement('a');
link.download = fileName;
link.href = 'data:,' + fileContents;
link.click();
}
HTML only: use the download attribute:
<a download="logo.gif" href="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7">Download transparent png</a>
Javascript only: you can save any data URI with this code:
function saveAs(uri, filename) {
var link = document.createElement('a');
if (typeof link.download === 'string') {
link.href = uri;
link.download = filename;
//Firefox requires the link to be in the body
document.body.appendChild(link);
//simulate click
link.click();
//remove the link when done
document.body.removeChild(link);
} else {
window.open(uri);
}
}
var file = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7'
saveAs(file, 'logo.gif');
Chrome, Firefox, and Edge 13+ will use the specified filename.
IE11, Edge 12, and Safari 9 (which don't support the download attribute) will download the file with their default name or they will simply display it in a new tab, if it's of a supported file type: images, videos, audio files, …
According to RFC 2397, no, there isn't.
Nor does there appear to be any attribute of the <a> element that you can use either.
However HTML5 has subsequently introduced the download attribute on the <a> element, although at the time of writing support is not universal (no MSIE support, for example)
I've looked a bit in firefox sources in netwerk/protocol/data/nsDataHandler.cpp
data handler only parses content/type and charset, and looks if there is ";base64"
in the string
the rfc specifices no filename and at least firefox handles no filename for it,
the code generates a random name plus ".part"
I've also checked firefox log
[b2e140]: DOCSHELL 6e5ae00 InternalLoad data:application/octet-stream;base64,SGVsbG8=
[b2e140]: Found extension '' (filename is '', handling attachment: 0)
[b2e140]: HelperAppService::DoContent: mime 'application/octet-stream', extension ''
[b2e140]: Getting mimeinfo from type 'application/octet-stream' ext ''
[b2e140]: Extension lookup on '' found: 0x0
[b2e140]: Ext. lookup for '' found 0x0
[b2e140]: OS gave back 0x43609a0 - found: 0
[b2e140]: Searched extras (by type), rv 0x80004005
[b2e140]: MIME Info Summary: Type 'application/octet-stream', Primary Ext ''
[b2e140]: Type/Ext lookup found 0x43609a0
interesting files if you want to look at mozilla sources:
data uri handler: netwerk/protocol/data/nsDataHandler.cpp
where mozilla decides the filename: uriloader/exthandler/nsExternalHelperAppService.cpp
InternalLoad string in the log: docshell/base/nsDocShell.cpp
I think you can stop searching a solution for now, because I suspect there is none :)
as noticed in this thread html5 has download attribute, it works also on firefox 20 http://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#attr-hyperlink-download
The following Javascript snippet works in Chrome by using the new 'download' attribute of links and simulating a click.
function downloadWithName(uri, name) {
var link = document.createElement("a");
link.download = name;
link.href = uri;
link.click();
}
And the following example shows it's use:
downloadWithName("data:,Hello%2C%20World!", "helloWorld.txt")
No.
The entire purpose is that it's a datastream, not a file. The data source should not have any knowledge of the user agent handling it as a file... and it doesn't.
you can add a download attribute to the anchor element.
sample:
<a download="abcd.cer"
href="data:application/stream;base64,MIIDhTC......">down</a>
Using service workers, this is finally possible in the truest sense.
Create a fake URL. For example /saveAs/myPrettyName.jpg
Use URL in <a href, <img src, window.open( url ), absolutely anything that can be done with a "real" URL.
Inside the worker, catch the fetch event, and respond with the correct data.
The browser will now suggest myPrettyName.jpg even if the user opens the file in a new tab, and tries to save it there. It will be exactly as if the file had come from the server.
// In the service worker
self.addEventListener( 'fetch', function(e)
{
if( e.request.url.startsWith( '/blobUri/' ) )
{
// Logic to select correct dataUri, and return it as a Response
e.respondWith( dataURLAsRequest );
}
});
Look at this link:
http://lists.w3.org/Archives/Public/uri/2010Feb/0069.html
Quote:
It even works (as in, doesn't cause a problem) with ;base64 at the end
like this (in Opera at least):
data:text/plain;charset=utf-8;headers=Content-Disposition%3A%20attachment%3B%20filename%3D%22with%20spaces.txt%22%0D%0AContent-Language%3A%20en;base64,4oiaDQo%3D
Also there is some info in the rest messages of the discussion.
There is a tiny workaround script on Google Code that worked for me:
http://code.google.com/p/download-data-uri/
It adds a form with the data in it, submits it and then removes the form again. Hacky, but it did the job for me. Requires jQuery.
This thread showed up in Google before the Google Code page and I thought it might be helpful to have the link in here, too.
Here is a jQuery version based off of Holf's version and works with Chrome and Firefox whereas his version seems to only work with Chrome. It's a little strange to add something to the body to do this but if someone has a better option I'm all for it.
var exportFileName = "export-" + filename;
$('<a></a>', {
"download": exportFileName,
"href": "data:," + JSON.stringify(exportData, null,5),
"id": "exportDataID"
}).appendTo("body")[0].click().remove();
This one works with Firefox 43.0 (older not tested):
dl.js:
function download() {
var msg="Hello world!";
var blob = new File([msg], "hello.bin", {"type": "application/octet-stream"});
var a = document.createElement("a");
a.href = URL.createObjectURL(blob);
window.location.href=a;
}
dl.html
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8"/>
<title>Test</title>
<script type="text/javascript" src="dl.js"></script>
</head>
<body>
<button id="create" type="button" onclick="download();">Download</button>
</body>
</html>
If button is clicked it offered a file named hello.bin for download. Trick is to use File instead of Blob.
reference: https://developer.mozilla.org/de/docs/Web/API/File
(This answer has been made deprecated by newer technology, but will be kept here for historical interest.)
It's kind of hackish, but I've been in the same situation before. I was dynamically generating a text file in javascript and wanted to provide it for download by encoding it with the data-URI.
This is possible with minormajor user intervention. Generate a link right-click me and select "Save Link As..." and save as "example.txt". As I said, this is inelegant, but it works if you do not need a professional solution.
This could be made less painful by using flash to copy the name into the clipboard first. Of course if you let yourself use Flash or Java (now with less and less browser support I think?), you could probably find a another way to do this.
<a href=.. download=.. > works for left-click and right-click -> save link as..,
but <img src=.. download=.. > doesn't work for right-click -> save image as.. , "Download.jped" is suggested.
If you combine both:<a href=.. download=..><img src=..></a>
it works for left-click, right-click -> save link as.., right-click -> save image as..
You have to write the data-uri twice (href and src), so for large image files it is better to copy the uri with javascript.
tested with Chrome/Edge 88
var isIE = /*#cc_on!#*/false || !!document.documentMode; // At least IE6
var sessionId ='\n';
var token = '\n';
var caseId = CaseIDNumber + '\n';
var url = casewebUrl+'\n';
var uri = sessionId + token + caseId + url;//data in file
var fileName = "file.i4cvf";// any file name with any extension
if (isIE)
{
var fileData = ['\ufeff' + uri];
var blobObject = new Blob(fileData);
window.navigator.msSaveOrOpenBlob(blobObject, fileName);
}
else //chrome
{
window.requestFileSystem = window.requestFileSystem || window.webkitRequestFileSystem;
window.requestFileSystem(window.TEMPORARY, 1024 * 1024, function (fs) {
fs.root.getFile(fileName, { create: true }, function (fileEntry) {
fileEntry.createWriter(function (fileWriter) {
var fileData = ['\ufeff' + uri];
var blob = new Blob(fileData);
fileWriter.addEventListener("writeend", function () {
var fileUrl = fileEntry.toURL();
var link = document.createElement('a');
link.href = fileUrl;
link.download = fileName;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}, false);
fileWriter.write(blob);
}, function () { });
}, function () { });
}, function () { });
}
You actually can achieve this, in Chrome and FireFox.
Try the following url, it will download the code that was used.
data:text/html;base64,PGEgaHJlZj0iZGF0YTp0ZXh0L2h0bWw7YmFzZTY0LFBHRWdhSEpsWmowaVVGVlVYMFJCVkVGZlZWSkpYMGhGVWtVaUlHUnZkMjVzYjJGa1BTSjBaWE4wTG1oMGJXd2lQZ284YzJOeWFYQjBQZ3BrYjJOMWJXVnVkQzV4ZFdWeWVWTmxiR1ZqZEc5eUtDZGhKeWt1WTJ4cFkyc29LVHNLUEM5elkzSnBjSFErIiBkb3dubG9hZD0idGVzdC5odG1sIj4KPHNjcmlwdD4KZG9jdW1lbnQucXVlcnlTZWxlY3RvcignYScpLmNsaWNrKCk7Cjwvc2NyaXB0Pg==

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