I have base64 data URL in my angularJs controller, and I need an image file from that, so that I could send it to server as multi-part data through ajax?
I'm looking for something like file writer in angularjs.
Can anyone help me please?
you can generate blob from base64 data.
var imageBase64 = "image base64 data";
var blob = new Blob([imageBase64], {type: 'image/png'});
From this blob, you can generate file object.
var file = new File([blob], 'imageFileName.png');
You can use this file object and post it to server using multipart data.
Related
I'm actually struggeling with a problem handling some kml files with google map in my Javascript application.
I wrote a method with that I'm reading a KML file from an URL or my local file system and storing the content as a String in a Database. Now i would like to activate layers that are stored in my db by clicking a button. Everything is fine up to here.
In every example i can find they are only using the url-attribute of a KmlLayer by passing an url to a KML-File.
like here:
var ctaLayer = new google.maps.KmlLayer({
url: 'http://googlemaps.github.io/js-v2-samples/ggeoxml/cta.kml',
map: map
});
But since my files are stored as Strings in my db I don't have an url to a file, only the content. I can't find a way to only pass the XML-String as content.
Somebody here who can help?
Maybe someday somebody will struggle with a similar problem. The solution was a little bit tricky. I needed to create a Blob with the content of my String. With the blob I created a file and packed it into an URL. This URL you can pass to your kml parser. I used https://github.com/geocodezip/geoxml3 for that.
vm.activeLayers.forEach(function(value, key) {
var file = new Blob([value], {type: 'kml'})
var url = URL.createObjectURL(file);
var myParser = new geoXML3.parser({
map : map
});
myParser.parse(url);
})
I have a cropped image using this cropper. It is returning a base64 version of the cropped image.
I am trying to convert that base64 image to a blob or a file to be able to upload it to firebase storage using the code below.
var imageBase64 = $scope.cropper.croppedImage.split(',')[1];
var blob = new Blob([imageBase64], {type: 'image/png'});
var file = new File([imageBase64], 'imageFileName2.png', {type: 'image/png'});
when I tried to print file it has created an acutal File object that looks like this.
{
lastModified:1471604365544,
lastModifiedDate:"Fri Aug 19 2016 18:59:25 GMT+0800 (PHT)",
name:"imageFileName2.png",
size:228808,
type:"image/png",
webkitRelativePath:""
}
The File is being uploaded successfully though, but the result is broken. The preview on the firebase storage dashboard just looks like this (it never stops loading, and when I tried to download it, I got a broken image) :
To prove that my base64 image is not broken, here's a base64 pic of my cat Akasha, you can preview it in this base64 viewer.
In the 3.3.0 JS client, you can just upload a base64 string (docs)!
var imageBase64 = $scope.cropper.croppedImage.split(',')[1];
ref.putString(imageBase64, 'base64').then(function(snapshot) {
console.log('Uploaded a base64 string!');
});
The Blob and File APIs both take a UInt8Array, which the base64 string isn't, so you were basically creating an array that contained a single item, which was the base64 string, which wasn't a valid blob. Use the above upload to solve the problem.
I have an angular app that generate a pdf string and want to upload it (encoded uri, or raw data option).
I know that for a physical file, you can do the upload, but what about the pdf string generated within the app? is there a way to upload such?
My code is something like this:
var doc = new jsPDF();
doc.text(20, 20, 'Hello world!');
var str = doc.output('datauristring'); // this will be uri encoded string
var raw = doc.output();
var myForm = new FormData();
myForm.append('file', <what should go here??>);
//...
// POST myForm to backend
I have a remote server which has profile data and an image and when I retrieve it, I get the image url, which I can display using the <img> tag, by using the url.
When I have to modify the details, I send a new image, for which I upload a new image using a small AngularJS function and send the whole data using formData and http request.
But, out of curiosity, I was wondering whether there is any way to send an object of the same image using the url I received from the server.
Another reason I thought of it was that I was thinking of maybe changing its dimensions,etc.
Just in case if I ever needed to generate a thumbnail of the image of a smaller size in future.
Solved it myself by looking around and generating a canvas from the url, through dataURI by using the function :
var byteString = atob(dataURI.split(',')[1]);
var ab = new ArrayBuffer(byteString.length);
var ia = new Uint8Array(ab);
for (var i = 0; i < byteString.length; i++) {
ia[i] = byteString.charCodeAt(i);
}
var blob= new Blob([ab], { type: 'image/jpeg' });
to create a blob to send the image back after scaling(was required).
i try to make angular CRUD app that is a bit like "dropbox". So, it must have file and folder hosting with sharing and access functionality. I'm stuck on a question how to upload image and video files? I used File API (FileReader, Blob) to make preview of files on the client side but i dont have idea how to POST this type of data to server.
Something like this should work well to send as multipart/form-data request to backend API:
var file = ... // get from file input;
var backendUrl = ...
var fd = new FormData();
fd.append('myFile', file, 'filename.ext');
$http.post(backendUrl, fd, {
// this cancels AngularJS normal serialization of request
transformRequest: angular.identity,
// this lets browser set `Content-Type: multipart/form-data`
// header and proper data boundary
headers: {'Content-Type': undefined}
})
.success(function(){
//file was uploaded
})
.error(function(){
//something went wrong
});
See here for reference:
FormData API Doc
Using FormData Objects (MDN)
multipart-formdata file upload with AngularJS
You can upload file using ngFileUpload or angularFileUpload directives.
In case of angularFileUpload, you use .upload in controller and in case of ngFileUpload, you use .http
Also, you can also use application/x-www-form-urlencoded content type instead of multipart provided your file is not huge. In case of application/x-www-form-urlencoded, you can just receive the value in rest webservice as normal InputStream thereby requiring no need of marshalling of multipart data.
You may refer the below for the possible ways to upload file using angular js and rest web service:
http://technoguider.com/2015/08/file-upload-using-angular-js-and-rest-web-service/