I am trying to finish a download of a PDF from an API Rest. I can't see the pdf completely in a new browser tab, I get a chorme pop up with the message "Error
An error occurred while loading the PDF document."
I have the following:
function download_2() {
var myHeaders = new Headers();
myHeaders.append(
"Authorization",
"mytokennnnnnnnnnnnn"
);
var requestOptions = {
method: "GET",
headers: myHeaders,
redirect: "follow",
};
fetch(
"myAPIRESTurlurlurlurlurl",
requestOptions
)
.then((response) => response.text())
.then((result) => {
let blob = new Blob([result.data], { type: "application/pdf" });
var arrayBuff;
var fileReader = new FileReader();
fileReader.onload = function (event) {
arrayBuff = event.target.result;
};
fileReader.readAsArrayBuffer(blob);
var URL = window.URL || window.webkitURL;
const url = window.URL.createObjectURL(blob);
const link = document.createElement("a");
link.target = "_blank";
link.href = url;
//I apend the link element
document.body.appendChild(link);
//download
link.click();
// Clean and remove the link
link.parentNode.removeChild(link);
URL.revokeObjectURL(url);
})
.catch((error) => console.log("error", error));
}
I've also used the fileReader to then pass the blob to it, but I'm not sure if I'm doing it right.
Thank you for the help.
Regards.
Did you try to add the download="true" attribute to the href tag you created ?
Related
I have the following code in a NodeJS app using the library node-html-pdf:
pdf.create(PDF_html).toStream((err, pdfStream) => {
if (err) {
console.log(err)
return res.sendStatus(500)
} else {
res.statusCode = 200
res.setHeader('Content-type', 'application/pdf')
res.attachment()
pdfStream.on('end', () => {
return res.end()
})
pdfStream.pipe(res)
}
})
On the client side I am using fetch to retrieve and download the PDF using the following code:
document.getElementById('pdf_button').addEventListener("click", function() {
let query_nr = ''
let query_spnr = ''
let url = 'https://{my.public.server.url}/getPDF/'
fetch(url, {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify({
"nr": query_nr,
"spnr": query_spnr
})
})
.then((response) => response.blob())
.then((blob) => {
blob = new Blob([blob], {type: "application/pdf"});
const objectURL = URL.createObjectURL(blob);
const a = document.createElement("a")
document.body.appendChild(a)
a.style = "display: none"
a.href = objectURL
a.type = 'application/pdf'
a.download = query_nr + '-' + query_spnr + '.pdf'
console.log(a);
a.click()
// window.open(objectURL, '_blank');
})
.catch((error) => {
console.error(error);
})
});
The above code works fine as long I am using localhost as url, and I am able to select text from the downloaded text.
When I download the PDF from the server it seems like the whole PDF-file gets converted to an image (I might be very wrong), and I am not able to select any text.
Does anyone know how I can fix this? And why is this happening?
I am trying to open a PDF file in a new tab and want to read file without downloading it in local machine.
I tried this function, but it is not loading my pdf and giving error can not load pdf
function readFileInNewTab (fileId) {
let url = BASE_URL + "api/CMS/Documents/Download/" + fileId;
const requestOptions = {
method: 'GET',
headers: { 'Content-Type': 'application/pdf', ...authHeader(url) },
credentials: 'include',
responseType: "blob", // important
};
inProgress = true;
return fetch (url, requestOptions).then(handleResponse)
.then((response)=> {
const file = new Blob([response], { type: "application/pdf" });
//Build a URL from the file
const fileURL = URL.createObjectURL(file);
//Open the URL on new Window
debugger
const pdfWindow = window.open();
pdfWindow.location.href = fileURL;
})
.catch((error) => {
console.log(error);
});
} ```
This is my code:
function downloadImage(url) {
fetch(url, {
mode: 'no-cors',
})
.then(response => response.blob())
.then(blob => {
let blobUrl = window.URL.createObjectURL(blob);
let a = document.createElement('a');
a.download = url.replace(/^.*[\\\/]/, '');
a.href = blobUrl;
document.body.appendChild(a);
a.click();
a.remove();
})
}
var url = 'https://c4.wallpaperflare.com/wallpaper/203/636/834/minimalism-landscape-digital-
windows-11-hd-wallpaper-preview.jpg';
downloadImage(url)
i can successfully download the image but when I open the image it's shows Sorry, Photos can't open this file because the format is currently unsupported, or the file is corrupted
When I use unsplash image url in that time it's work well. Can anyone tell me please why it's happening and how can I fix this issue.
The issue here is the Response object , fetch is being called with mode:'no-cors', resulting in the response object to have type as "opaque" and hence using response.blob() will result into a Blob size of 0 and Blob type of "" (read more below in Response.blob()).
The mime-type is set as expected and your code works as expected but since you are making a cross origin request you are getting Response.blob() as empty and the file you subsequently save(download through anchor tag) has no data.
Read more about Response.blob()
Read more about Response.type
Read more about CORS Protocol
to validate the above try and console.log the blob like so :
function downloadImage(url) {
fetch(url, {
mode: 'no-cors',
})
.then(response => response.blob())
.then(blob => {
console.log(blob); //log the blob and check its size;
let blobUrl = window.URL.createObjectURL(blob);
let a = document.createElement('a');
a.download = url.replace(/^.*[\\\/]/, '');
a.href = blobUrl;
document.body.appendChild(a);
a.click();
a.remove();
})
}
Do like this because you're not defining MIME type while downloading the file.
return fetch(urlEndpoint, options)
.then((res) => res.blob())
.then((blob) => URL.createObjectURL(blob))
.then((href) => {
Object.assign(document.createElement('a'), {
href,
download: 'filename.png',
}).click();
});
or else you can do like this
download(filename,url) {
fetch(url, {
mode: 'no-cors',
})
.then(response => response.blob())
.then(blob => URL.createObjectURL(blob))
.then(uril => {
var link = document.createElement("a");
link.href = uril;
link.download = filename + ".png";
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
});
}
I am receiving a ReadableStream from a server, returned from my fetch call.
A ReadableStream is returned but I don't know how to trigger a download from this stage. I can't use the url in an href because it requires an Authorization token.
I don't want to install fs on the client so what options do I have?
try {
const res = await fetch(url, {
method: 'GET',
headers: {
Authorization: `Bearer ${token}`,
'Content-Type': 'application/octet-stream'
}
});
const blob = await res.blob();
const newBlob = new Blob([blob]);
const newUrl = window.URL.createObjectURL(newBlob);
const link = document.createElement('a');
link.href = newUrl;
link.setAttribute('download', 'filename');
document.body.appendChild(link);
link.click();
link.parentNode.removeChild(link);
window.URL.revokeObjectURL(newBlob);
} catch (error) {
console.log(error);
}
Update 1
I converted the file to a Blob, then passed it into a newly generated href. Successfully downloaded a file. The end result was the ReadStream contents as a .txt file.
Meaning stuff like this
x:ÚêÒÓ%¶âÜTb∞\܃
I have found 2 solutions, both worked but I was missing a simple addition to make them work.
The native solution is
try {
const res = await fetch(url, {
method: 'GET',
headers: {
Authorization: `Bearer ${token}`
}
});
const blob = await res.blob();
const newBlob = new Blob([blob]);
const blobUrl = window.URL.createObjectURL(newBlob);
const link = document.createElement('a');
link.href = blobUrl;
link.setAttribute('download', `${filename}.${extension}`);
document.body.appendChild(link);
link.click();
link.parentNode.removeChild(link);
// clean up Url
window.URL.revokeObjectURL(blobUrl);
This version is using the npm package steamSaver for anyone who would prefer it.
try {
const res = await fetch(url, {
method: 'GET',
headers: {
Authorization: `Bearer ${token}`
}
});
const fileStream = streamSaver.createWriteStream(`${filename}.${extension}`);
const writer = fileStream.getWriter();
const reader = res.body.getReader();
const pump = () => reader.read()
.then(({ value, done }) => {
if (done) writer.close();
else {
writer.write(value);
return writer.ready.then(pump);
}
});
await pump()
.then(() => console.log('Closed the stream, Done writing'))
.catch(err => console.log(err));
The key for why it was not working was because I did not include the extension, so it either errored out because of the mimetype was wrong or it opens a .txt file with a string of the body instead of the image.
Im using the following code to convert the byte code to zip file but it does not download the actual xml and asc file send in the response , instead it just donwloads the standard zip contents , im not aware where i am going wrong , can anyone help me with this,
$http({
url:url,
method: requestType,
data:requestBody?requestBody:"",
headers: {
'Content-type': "application/json",
"SessionID":$rootScope.token
},
responseType: 'arraybuffer'
}).success(function (data, status, headers, config) {
let blob = new Blob([data], {type: "application/zip"});
let objectUrl = URL.createObjectURL(blob);
let link = document.createElement('a');
link.href = objectUrl;
link.download = fileName;
link.click();
window.URL.revokeObjectURL(link.href);
$scope.exp = {}; // to reset the export form after submit.
$scope.surveyReportdownloading = false;
$scope.tabActive = false;
}).error(function (error) {
//upload failed
console.log(error);
});
this is not downloading the actual files at all. Can anyone help me through this. The byte cod ethat backend team is sending is as follows.
"PK:8xJMÆVÞ|xl/workbook.xml ¢( ÍnÂ0ïúÖ>#MpR¸{C,²vdѾ}CR¢¶'n;³³fË«u磵göIñ« ¡+8÷²AþÅvhú]mÐKwⶮµÄBxEwØ ñî<´GX¾s(oµ#6°|~b¬¼5;h¼úAöƽîÍd| ñ¿©rMbFVð~!î Ø`nT10Wè~Ø4SäiÅÑ,ÇWøÁÿC|¼í¶ëÃzûL /ó4KËYZG0U:üþÂòPK:8xJnmt?Ø[Content_Types].xml ¢( ÅMNÃ0¯y·] vl¡\À²'ÕøGIiÏÆ#q& TUЪº²lÏ{ßõä·÷é|ãl
mð¥#×ÁX¿,EKU~#æ³éË6f\ê±5Q¼u
Na"x¾©Brx2*½RKÑèZêà <åÔyÙôÕ6=løxÀ²\dwC]±±Z_˵7¿ y¨*«ÁÝ:(5¹¦è×Â)ë¯zc¹ Áã _S¬ìk°¶w'~Äd
d èQ9öF¾´êBÙ/ãâ¼ÃîüÿkiÛ>þfå"Ç㿽Sç =ÉÞ' ]d £áºE
îdþ`s(}Oâ&K\gJü=x?½wÈþ}PK
38xJ£ ²× rels/.rels ¢( PK:8xJILE#¥¶xl/worksheets/sheet1.xml ¢( ¥ÛrÇEÅ÷èn\U\¡\q®ª%^ÿþõ˯ûÃ/·W»Ýñìÿ|"
Any help is appreciated. Thanks!
Seems like the issue is with the type parameter try with the below code
You can access the content-type from headers.
If it doesn't work, try with application/zip, application/octet-stream
$http({
url: url,
method: requestType,
data: requestBody ? requestBody : "",
headers: {
'Content-type': "application/json",
"SessionID": $rootScope.token
},
responseType: 'arraybuffer'
}).success(function(data, status, headers, config) {
let blob = new Blob([data], {
type: headers['content-type']
// OR
// type:"application/zip, application/octet-stream"
});
let objectUrl = URL.createObjectURL(blob);
let link = document.createElement('a');
link.href = objectUrl;
link.download = fileName;
link.click();
window.URL.revokeObjectURL(link.href);
$scope.exp = {}; // to reset the export form after submit.
$scope.surveyReportdownloading = false;
$scope.tabActive = false;
}).error(function(error) {
//upload failed
console.log(error);
});
var blob = new Blob([response.data],{type:headers['content-type']});
var link = document.createElement('a');
link.href = window.URL.createObjectURL(blob);
link.download = "Filename";
link.click();