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Image Blob - Pop up window not showing content

I am working on displaying an image in blob
const file = new Blob([response.data], { type: 'image/png' });
const fileURL = URL.createObjectURL(file);
window.open(fileURL);
console.log('fileURL', fileURL);
const image = document.createElement('img');
I am getting this response
PNG
IHDR2²OósRGB®ÎégAMA±üa pHYsÃÃÇo¨dã¼IDATx^ìý=ô<Ó¶Þ;Ðزg
cõ-EVÙÚÜòfã·#cV0¡\¡5È·Eüü$
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ÕEk+bv|_Hß5yÏçnØ1C´ìOÑÞøVÛ|¯
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¯FXí¸.Í\"øãñXÈ|8°àmÇýØa)#
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When I reffer some stackoverflow answers I understood my response is wrong. my questions is how to get correct binary response ..

You can use XMLHttpRequest() or fetch() to get response as Blob
let url, w;
let request = fetch("/path/to/image");
request.then(function(response) {
return response.blob() // return `Promise` which resolves to `Blob` of response
})
.then(function(blob) {
url = URL.createObjectURL(blob);
w = window.open(url);
})
.catch(function(err) {
console.log(err)
});
let url, w;
let request = new XMLHttpRequest();
request.open("GET", "/path/to/image");
request.responseType = "blob"; // set `responseType` to `"blob"`
request.onload = function() {
url = URL.createObjectURL(blob);
w = window.open(url);
}
request.onerror = function(e) {
console.log(e);
}
request.send(null);

$http.get(ur1, {
responseType: 'blob'
}).then(function (res) {
this.download(res)
}, function (err) {
conseole.log(err)
})
}
};
this.download = function (data) {
var type = data.headers('Content-Type'),
content = data.data,
fileName = data.headers('x-ms-meta-originalname'),//Get the file name
blob = new Blob([content], {type: type}),
url = window.URL.createObjectURL(blob);
var a = document.createElement('a');
a.href = url;
a.target="_self";
a.download = fileName;
a.click();
a = undefined;
}
Additinal Details here: http://angularjstricks.blogspot.in/2017/03/download-file-from-server-with-http-in.html

How to save .xlsx data to file as a blob

I have a similar question to this question(Javascript: Exporting large text/csv file crashes Google Chrome):
I am trying to save the data created by excelbuilder.js's EB.createFile() function. If I put the file data as the href attribute value of a link, it works. However, when data is big, it crashes Chrome browser. Code are like this:
//generate a temp <a /> tag
var link = document.createElement("a");
link.href = 'data:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;base64,' + encodeURIComponent(data);
link.style = "visibility:hidden";
link.download = fileName;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
My code to create the data using excelbuilder.js is like follows:
var artistWorkbook = EB.createWorkbook();
var albumList = artistWorkbook.createWorksheet({name: 'Album List'});
albumList.setData(originalData);
artistWorkbook.addWorksheet(albumList);
var data = EB.createFile(artistWorkbook);
As suggested by the answer of the similar question (Javascript: Exporting large text/csv file crashes Google Chrome), a blob needs to be created.
My problem is, what is saved in the file isn't a valid Excel file that can be opened by Excel. The code that I use to save the blob is like this:
var blob = new Blob(
[data],
{type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;base64,"}
);
// Programatically create a link and click it:
var a = document.createElement("a");
a.href = URL.createObjectURL(blob);
a.download = fileName;
a.click();
If I replace the [data] in the above code with [Base64.decode(data)], the contents in the file saved looks more like the expected excel data, but still cannot be opened by Excel.

I had the same problem as you. It turns out you need to convert the Excel data file to an ArrayBuffer.
var blob = new Blob([s2ab(atob(data))], {
type: ''
});
href = URL.createObjectURL(blob);
The s2ab (string to array buffer) method (which I got from https://github.com/SheetJS/js-xlsx/blob/master/README.md) is:
function s2ab(s) {
var buf = new ArrayBuffer(s.length);
var view = new Uint8Array(buf);
for (var i=0; i!=s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
return buf;
}

The answer above is correct. Please be sure that you have a string data in base64 in the data variable without any prefix or stuff like that just raw data.
Here's what I did on the server side (asp.net mvc core):
string path = Path.Combine(folder, fileName);
Byte[] bytes = System.IO.File.ReadAllBytes(path);
string base64 = Convert.ToBase64String(bytes);
On the client side, I did the following code:
const xhr = new XMLHttpRequest();
xhr.open("GET", url);
xhr.setRequestHeader("Content-Type", "text/plain");
xhr.onload = () => {
var bin = atob(xhr.response);
var ab = s2ab(bin); // from example above
var blob = new Blob([ab], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;' });
var link = document.createElement('a');
link.href = window.URL.createObjectURL(blob);
link.download = 'demo.xlsx';
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
};
xhr.send();
And it works perfectly for me.

I've found a solution worked for me:
const handleDownload = async () => {
const req = await axios({
method: "get",
url: `/companies/${company.id}/data`,
responseType: "blob",
});
var blob = new Blob([req.data], {
type: req.headers["content-type"],
});
const link = document.createElement("a");
link.href = window.URL.createObjectURL(blob);
link.download = `report_${new Date().getTime()}.xlsx`;
link.click();
};
I just point a responseType: "blob"

This works as of: v0.14.0 of https://github.com/SheetJS/js-xlsx
/* generate array buffer */
var wbout = XLSX.write(wb, {type:"array", bookType:'xlsx'});
/* create data URL */
var url = URL.createObjectURL(new Blob([wbout], {type: 'application/octet-stream'}));
/* trigger download with chrome API */
chrome.downloads.download({ url: url, filename: "testsheet.xlsx", saveAs: true });

Here's my implementation using the fetch api. The server endpoint sends a stream of bytes and the client receives a byte array and creates a blob out of it. A .xlsx file will then be generated.
return fetch(fullUrlEndpoint, options)
.then((res) => {
if (!res.ok) {
const responseStatusText = res.statusText
const errorMessage = `${responseStatusText}`
throw new Error(errorMessage);
}
return res.arrayBuffer();
})
.then((ab) => {
// BE endpoint sends a readable stream of bytes
const byteArray = new Uint8Array(ab);
const a = window.document.createElement('a');
a.href = window.URL.createObjectURL(
new Blob([byteArray], {
type:
'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
}),
);
a.download = `${fileName}.XLSX`;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
})
.catch(error => {
throw new Error('Error occurred:' + error);
});

Solution for me.
Step: 1
<a onclick="exportAsExcel()">Export to excel</a>
Step: 2
I'm using file-saver lib.
Read more: https://www.npmjs.com/package/file-saver
npm i file-saver
Step: 3
let FileSaver = require('file-saver'); // path to file-saver
function exportAsExcel() {
let dataBlob = '...kAAAAFAAIcmtzaGVldHMvc2hlZXQxLnhtbFBLBQYAAAAACQAJAD8CAADdGAAAAAA='; // If have ; You should be split get blob data only
this.downloadFile(dataBlob);
}
function downloadFile(blobContent){
let blob = new Blob([base64toBlob(blobContent, 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')], {});
FileSaver.saveAs(blob, 'report.xlsx');
}
function base64toBlob(base64Data, contentType) {
contentType = contentType || '';
let sliceSize = 1024;
let byteCharacters = atob(base64Data);
let bytesLength = byteCharacters.length;
let slicesCount = Math.ceil(bytesLength / sliceSize);
let byteArrays = new Array(slicesCount);
for (let sliceIndex = 0; sliceIndex < slicesCount; ++sliceIndex) {
let begin = sliceIndex * sliceSize;
let end = Math.min(begin + sliceSize, bytesLength);
let bytes = new Array(end - begin);
for (var offset = begin, i = 0; offset < end; ++i, ++offset) {
bytes[i] = byteCharacters[offset].charCodeAt(0);
}
byteArrays[sliceIndex] = new Uint8Array(bytes);
}
return new Blob(byteArrays, { type: contentType });
}
Work for me. ^^

try FileSaver.js library. it might help.
https://github.com/eligrey/FileSaver.js/

This answer depends on both the frontend and backend having a compatible return object, so giving both frontend & backend logic. Make sure backend return data is base64 encoded for the following logic to work.
// Backend code written in nodejs to generate XLS from CSV
import * as XLSX from 'xlsx';
export const convertCsvToExcelBuffer = (csvString: string) => {
const arrayOfArrayCsv = csvString.split("\n").map((row: string) => {
return row.split(",")
});
const wb = XLSX.utils.book_new();
const newWs = XLSX.utils.aoa_to_sheet(arrayOfArrayCsv);
XLSX.utils.book_append_sheet(wb, newWs);
const rawExcel = XLSX.write(wb, { type: 'base64' })
// set res.setHeader('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')
// to include content type information to frontend.
return rawExcel
}
//frontend logic to get the backend response and download file.
// function from Ron T's answer which gets a string from ArrayBuffer.
const s2ab = (s) => {
var buf = new ArrayBuffer(s.length);
var view = new Uint8Array(buf);
for (var i = 0; i !== s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
return buf;
};
const downloadExcelInBrowser = ()=>{
const excelFileData = await backendCall();
const decodedFileData = atob(excelFileData.data);
const arrayBufferContent = s2ab(decodedFileData); // from example above
const blob = new Blob([arrayBufferContent], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;' });
var URL = window.URL || window.webkitURL;
var downloadUrl = URL.createObjectURL(fileBlob);
if (filename) {
// use HTML5 a[download] attribute to specify filename
var a = document.createElement('a');
// safari doesn't support this yet
if (typeof a.download === 'undefined') {
window.location.href = downloadUrl;
} else {
a.href = downloadUrl;
a.download = 'test.xlsx';
document.body.appendChild(a);
a.click();
}
} else {
window.location.href = downloadUrl;
}
}

if you are using typescript then here is a working example of how to convert array to xlsx and download it.
const fileName = "CustomersTemplate";
const fileExtension = ".xlsx";
const fullFileName = fileName.concat(fileExtension);
const workBook : WorkBook = utils.book_new();
const content : WorkSheet = utils.json_to_sheet([{"column 1": "data", "column 2": "data"}]);
utils.book_append_sheet(workBook, content, fileName);
const buffer : any = writeFile(workBook, fullFileName);
const data : Blob = new Blob(buffer, { type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;" });
const url = URL.createObjectURL(data); //some browser may use window.URL
const a = document.createElement("a");
document.body.appendChild(a);
a.href = url;
a.download = fullFileName;
a.click();
setTimeout(() => {
window.URL.revokeObjectURL(url);
document.body.removeChild(a);
}, 0);

File download does not work on firefox

I'm using angular 1.2.27, and I'm trying to download a file. It works perfect on chrome but on FF nothing happens, the request returns 200/ok and the success code runs, but that's it, no file is downloaded:
var fileLoaded = $q.defer();
$http.get(url, { responseType: 'arraybuffer' })
.success(function (data,status,hdr) {
var cd = hdr('Content-Disposition').split(';');
var fileName = '';
_.forEach(cd,function(d){
if(d.trim().indexOf('filename') >= 0){
fileName = d.split('=')[1].replace(/[\"]/g,'');
return false;
}
});
var file = new Blob([data]);
var wurl = $window.URL || $window.webkitURL;
var fileURL = wurl.createObjectURL(file);
console.log( 'fileURL:' , fileURL );
var a = document.createElement("a");
a.href = fileURL;
a.download = fileName;
a.target = "_self";
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
wurl.revokeObjectURL(fileURL);
fileLoaded.resolve(true);
}).error(function (data) {
// console.error(data);
fileLoaded.reject(data);
});
return fileLoaded.promise;
}
The only difference i see is when i log the fileURL. on chrome it appears like this:
blob:http%3A//localhost%3A9000/e869aa88-8190-4d9d-a379-9ad977a09613
And on FF like this:
blob:http://localhost:9000/f36b7773-00bb-4ade-87be-8f197c41ccf8
But I assume this is just a console thing.
any idea what I'm doing wrong?

Putting an answer here for reference. Using FileSaver from #Satpal comment, i was able to solve it easily:
var fileLoaded = $q.defer();
$http.get(url, { responseType: 'arraybuffer' })
.success(function (data,status,hdr) {
var cd = hdr('Content-Disposition').split(';');
var fileName = '';
_.forEach(cd,function(d){
if(d.trim().indexOf('filename') >= 0){
fileName = d.split('=')[1].replace(/[\"]/g,'');
return false;
}
});
var file = new Blob([data]);
saveAs(file, fileName);
fileLoaded.resolve(true);
}).error(function (data) {
// console.error(data);
fileLoaded.reject(data);
});
return fileLoaded.promise;
}

downloding csv file is not working in internet explorer11 it redirecting page into another page (web page cann't be displayed)

It is not downloading csv file, it redirecting current page to another page (web page cann't be displayed)
This is code for downloading csv file
var fileName = "test";
var data = $(this).first(); //Only one table
var a = document.createElement('a');
a.href = 'data:' + mimeType + ';charset=utf-8,' + escape(data);
a.download = fileName;
a.style = 'display:none';
if (navigator.msSaveBlob) { // IE 10+
var blob = new Blob([data], {
"type": "text/csv;charset=utf-8;"
});
navigator.msSaveBlob(blob, fileName);
}
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
If I debug this code it ask for downloading a file after that go to the another page

You had special handling for IE browser.
But you need to put non-IE code in else block.
var fileName = "test";
var data = $(this).first(); //Only one table
var mimeType = 'text/csv';
var a = document.createElement('a');
a.href = 'data:' + mimeType + ';charset=utf-8,' + escape(data);
a.download = fileName;
a.style = 'display:none';
if (navigator.msSaveBlob) { // IE 10+
var blob = new Blob([data], {
"type": "text/csv;charset=utf-8;"
});
navigator.msSaveBlob(blob, fileName);
}
else { // ELSE non-IE
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
}

we can also do like this,we can add a return statement,this looks better
var fileName = "test";
var data = $(this).first(); //Only one table
var a = document.createElement('a');
a.href = 'data:' + mimeType + ';charset=utf-8,' + escape(data);
a.download = fileName;
a.style = 'display:none';
if (navigator.msSaveBlob) { // IE 10+
var blob = new Blob([data], {
"type": "text/csv;charset=utf-8;"
});
navigator.msSaveBlob(blob, fileName);
return;
}
document.body.appendChild(a);
a.click();
document.body.removeChild(a);

Create json file using blob

I have written json code in string and i want to send it using xmlhttp as .json file. Is it possible to do it with blob?
var cleanScript = {
'type': 'script',
'api_key': api_key,
'data': data,
'inputs': inputs,
'timeoutSeconds': timeoutSeconds
};
var jsonse = JSON.stringify(cleanScript, null, 2);
Now json to blob?

Try something like this
var cleanScript = {
'type': 'script',
'api_key': api_key,
'data': data,
'inputs': inputs,
'timeoutSeconds': timeoutSeconds
};
var jsonse = JSON.stringify(cleanScript);
var blob = new Blob([jsonse], {type: "application/json"});
var url = URL.createObjectURL(blob);
var a = document.createElement('a');
a.href = url;
a.download = "backup.json";
a.textContent = "Download backup.json";
document.getElementById('json').appendChild(a);
<div id="json"></div>

Try the code below:
var int2ByteArray = function(i, minByteCount) {
var result = [],
buf = code = +i,
offsetCount = 0;
while ((buf = code>>(8 * offsetCount)) || offsetCount < minByteCount) {
buf = buf & 0xFF;
++offsetCount;
result.push(buf);
}
return result.reverse();
};
var ascii2ByteArray = function(s) {
if (!s) return 0;
var result = [];
[].map.call(s, function(c) {
result = result.concat(int2ByteArray((typeof(c)).toLowerCase() == "number" ? c : c.charCodeAt(0)));
});
return result;
};
// You got the blob here, do whatever you want.
var blob = new Blob(new Uint8Array(ascii2ByteArray(jsonse)), {type:"text/json"});
The matrix is to convert a string(stringfied by JSON.stringify) in to a Uint8Array that could be used making a blob.
I happened make something like that before, hope it's useful.