I'm trying to create a download link in an angular app that makes data in a model downloadable as a CSV file. I have it all working except for the actual download link. Using filesaver.js is blowing up unit tests in Karma so I'm exploring just doing it manually.
Below is what I have. In the controller:
var blob = new Blob([data.join('\n')], {type: 'text/csv;charset=utf-8'});
$scope.downloadUrl = URL.createObjectURL(blob);
In the view, I have:
<a ng-href="{{downloadUrl}}" download="ttester.csv" id="download">Download</a>
The issue is this opens a new page in Firefox 20 with the URL "unsafe:blob:af775c64-dcb1-864a-8eaa-adebe7f101a7", notice the "unsafe:" prefix. Removing that prefix downloads the data correctly, but without the filename I want.
What am I missing in my hyperlink to make it work? I expect it to open a download dialog with the filename tester.csv for the file.
Really appreciate any help
You could use the following code that will create the blob, a fake link and will dispatch a click event on this fake link. Note that no new page should be opened but you will be directly prompted with the save dialog box.
var blob = new Blob([data.join('\n')], {type: 'text/csv;charset=utf-8'});
var url = window.URL || window.webkitURL;
var link = document.createElementNS("http://www.w3.org/1999/xhtml", "a");
link.href = url.createObjectURL(blob);
link.download = 'teams.csv'; // whatever file name you want :)
var event = document.createEvent("MouseEvents");
event.initEvent("click", true, false);
link.dispatchEvent(event);
You can see a working Fiddle here
Related
I am facing issue to download pdf in SAPUI5 application. Issue is Getting base64 string from backend system but not able to convert it and display as PDF.
I am able to convert the base64 and download also but only small size.
Not able to download for larger PDF file its downloading but shows download failed.
kindly help me out
var data =" JVBERi0xLjQNJeLjz9MNCjc1MDEgMCBvYmogPDwvTGluZWFyaXplZCAxL0wgOTM2NDM1Mi9PIDc1MDMvRSAxMjE3ODgvTiA1MjIvVCA5MjE0MjgzL0ggWyA2..";
var uri = 'data:application/pdf;base64,' + atob(data);
var link = document.createElement("a");
link.href = uri;
link.style = "visibility:hidden";
link.download = object.FileName;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
Saving the data as a blob and setting the download link to get the data from the blog may solve your problem for large files. The most effective way in this mechanism is to get the data from your server as binary instead of Base64. It works with base64 too - but it is just a resource over kill in the blob scenario.
var data = Uint8Array.from(atob(base64_string), c => c.charCodeAt(0));
var blob = new Blob([data], {type: "octet/stream"});
var link = document.createElement("a");
link.href = window.URL.createObjectURL(blob);
...
...
As per you current solution, a hyperlink will be created with href contains data:application/pdf;base64,' + base64Data. When the hyperlink is clicked the complete URL will be opened in the browser new tab, which makes the browser to download the PFD file.
If the base64 data is bulk then the browser will take time to download PDF. Sometimes browser will be crashed OR leads to download failed error as it takes too much of time to download.
Alternative Options
Using GET_STEAM method you can download the pdf from the backend only.
Using download plugins like downloadjs, FileSaver.js, StreamSaver.js.
As per you requirement you can get different available plugins for file downloading using client-side JavaScript
Here is a sap blog entry solving your problem.
TLDR:
var base64EncodedPDF = "JVBERi0xLjcNCiW..."; // the encoded string
var decodedPdfContent = atob(base64EncodedPDF);
var byteArray = new Uint8Array(decodedPdfContent.length)
for(var i=0; i<decodedPdfContent.length; i++){
byteArray[i] = decodedPdfContent.charCodeAt(i);
}
var blob = new Blob([byteArray.buffer], { type: 'application/pdf' });
var _pdfurl = URL.createObjectURL(blob);
this._PDFViewer.setSource(_pdfurl);
I have a plain text variable which I want to store and save on a .txt file using Angular.
So far I have tried the following:
var data = new Blob([text], {type: 'text/plain'});
const url= window.URL.createObjectURL(data);
window.open(url);
Being text the variable with the plain text content. It seems to work but it opens de blob on a new browser tab, and I need it to be downloaded as whatever.txt.
How can I achieve this? Thanks!
The solution can be found here:
JavaScript blob filename without link
The steps are the following:
Create a hidden <a> tag.
Set its href attribute to the blob's URL.
Set its download attribute to the filename.
Click on the <a> tag.
This is working code from my application
const file = new window.Blob([data], { type: contentType });
const downloadAncher = document.createElement("a");
downloadAncher.style.display = "none";
const fileURL = URL.createObjectURL(file);
downloadAncher.href = fileURL;
downloadAncher.download = fileName;
downloadAncher.click();
UPDATE:
Creating a Blob from a base64 string in JavaScript
I am trying to implement click a button and download file from its DataURL.
Currently, since the Chrome has restricted the old way such as building <a> link which throws error like:
Not allowed to navigate top frame to data URL: ....
The solution I found is open new window with iframe and set the DataURL as its src
let jpgWindow = window.open("", "_blank")
var html = "<html><body><iframe width='100%' height='100%' src='data:application/jpeg;base64, "+ theDataURL+"'></iframe></body></html>";
jpgWindow.document.write(html)
When I click the button, the download works, but the picture is downloaded with filename "download", there is no way I can specify what file name I want it default to.
Any thought?
Look into window.URL.createObjectURL https://developer.mozilla.org/en-US/docs/Web/API/URL/createObjectURL
const blob = new Blob(['array of data in your file'], {type : 'text/rtf'});
const anchor = document.createElement('a');
anchor.href = window.URL.createObjectURL(blob);
anchor.download = 'the-file-name.txt';
anchor.click();
I'm sure there is a super easy way to do this, but I'm pretty new to web programming so not sure of how to actually do it. I have a simple form that takes in a doc file and a media file (the media file can either be picked, or created via webcam). So far it allows the user to pick the media file or create one but I'm not sure how to attach that created file to the actual file button so it can be posted.
function sendMail(){
var blob = new Blob(recordedBlobs, {type: 'video/webm'});
var url = window.URL.createObjectURL(blob);
var a = document.createElement('a');
a.style.display = 'none';
a.href = url;
document.getElementById("media").appendChild(a);
}
This is what I'm trying but doesn't seem to be working. ('media' is the id of my file button I want to attach the file to).
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