| title | description |
|---|---|
File Transfer |
Upload and download files. |
With the new features introduced in the Fetch API and the XMLHttpRequest, this plugin may not be needed any more for your use case. For small file transfers, you probably won't require this plugin. But, if you plan to handle large downloads, suffering from slow saving, timeouts, or crashes, this plugin is better suited for your use case over the Fetch API or the XMLHttpRequest.
Migrating from this plugin to using the new features of XMLHttpRequest, is explained in this Cordova blog post.
This plugin allows you to upload and download files.
This plugin defines global FileTransfer, FileUploadOptions constructors. Although in the global scope, they are not available until after the deviceready event.
document.addEventListener("deviceready", onDeviceReady, false);
function onDeviceReady() {
console.log(FileTransfer);
}To get a few ideas, check out the sample at the bottom of this page.
Report issues with this plugin on the Apache Cordova issue tracker
cordova plugin add cordova-plugin-file-transfer- Android
- Browser
- iOS
The FileTransfer object provides a way to upload files using an HTTP
multi-part POST or PUT request, and to download files.
- onprogress: Called with a
ProgressEventwhenever a new chunk of data is transferred. (Function)
-
upload: Sends a file to a server.
-
download: Downloads a file from server.
-
abort: Aborts an in-progress transfer.
Parameters:
-
fileURL: Filesystem URL representing the file on the device or a data URI. For backwards compatibility, this can also be the full path of the file on the device. (See Backwards Compatibility Notes below)
-
server: URL of the server to receive the file, as encoded by
encodeURI(). -
successCallback: A callback that is passed a
FileUploadResultobject. (Function) -
errorCallback: A callback that executes if an error occurs retrieving the
FileUploadResult. Invoked with aFileTransferErrorobject. (Function) -
options: Optional parameters (Object). Valid keys:
- fileKey: The name of the form element. Defaults to
file. (DOMString) - fileName: The file name to use when saving the file on the server. Defaults to
image.jpg. (DOMString) - httpMethod: The HTTP method to use - either
PUTorPOST. Defaults toPOST. (DOMString) - mimeType: The mime type of the data to upload. Defaults to
image/jpeg. (DOMString) - params: A set of optional key/value pairs to pass in the HTTP request. (Object, key/value - DOMString)
- chunkedMode: Whether to upload the data in chunked streaming mode. Defaults to
true. (Boolean) - headers: A map of header name/header values. Use a hash to specify one or more than one value. On iOS, FireOS, and Android, if a header named Content-Type is present, multipart form data will NOT be used. (Object)
- fileKey: The name of the form element. Defaults to
-
trustAllHosts: Optional parameter, defaults to
false. If set totrue, it accepts all security certificates. Not recommended for production use. Supported on iOS. (boolean)
// !! Assumes variable fileURL contains a valid URL to a text file on the device,
// for example, cdvfile://localhost/persistent/path/to/file.txt
var win = function (r) {
console.log("Code = " + r.responseCode);
console.log("Response = " + r.response);
console.log("Sent = " + r.bytesSent);
}
var fail = function (error) {
alert("An error has occurred: Code = " + error.code);
console.log("upload error source " + error.source);
console.log("upload error target " + error.target);
}
var options = new FileUploadOptions();
options.fileKey = "file";
options.fileName = fileURL.substr(fileURL.lastIndexOf('/') + 1);
options.mimeType = "text/plain";
var params = {};
params.value1 = "test";
params.value2 = "param";
options.params = params;
var ft = new FileTransfer();
ft.upload(fileURL, encodeURI("http://some.server.com/upload.php"), win, fail, options);function win(r) {
console.log("Code = " + r.responseCode);
console.log("Response = " + r.response);
console.log("Sent = " + r.bytesSent);
}
function fail(error) {
alert("An error has occurred: Code = " + error.code);
console.log("upload error source " + error.source);
console.log("upload error target " + error.target);
}
var uri = encodeURI("http://some.server.com/upload.php");
var options = new FileUploadOptions();
options.fileKey="file";
options.fileName=fileURL.substr(fileURL.lastIndexOf('/')+1);
options.mimeType="text/plain";
var headers={'headerParam':'headerValue', 'headerParam2':'headerValue2'};
options.headers = headers;
var ft = new FileTransfer();
var progressValue = 0;
ft.onprogress = function(progressEvent) {
if (progressEvent.lengthComputable) {
// Calculate the percentage
progressValue = progressEvent.loaded / progressEvent.total;
} else {
progressValue++;
}
// Display percentage in the UI
document.getElementByID('progress-value').innerHTML = progressValue;
};
ft.upload(fileURL, uri, win, fail, options);A FileUploadResult object is passed to the success callback of the
FileTransfer object's upload() method.
-
bytesSent: The number of bytes sent to the server as part of the upload. (long)
-
responseCode: The HTTP response code returned by the server. (long)
-
response: The HTTP response returned by the server. (DOMString)
-
headers: The HTTP response headers by the server. (Object)
- Currently supported on iOS only.
-
Does not support
responseCodeorbytesSent. -
Does not support uploads of an empty file with chunkedMode=true and
multipartMode=false.
- withCredentials: boolean that tells the browser to set the withCredentials flag on the XMLHttpRequest
Parameters:
-
source: URL of the server to download the file, as encoded by
encodeURI(). -
target: Filesystem url representing the file on the device. For backwards compatibility, this can also be the full path of the file on the device. (See Backwards Compatibility Notes below)
-
successCallback: A callback that is passed a
FileEntryobject. (Function) -
errorCallback: A callback that executes if an error occurs when retrieving the
FileEntry. Invoked with aFileTransferErrorobject. (Function) -
trustAllHosts: Optional parameter, defaults to
false. If set totrue, it accepts all security certificates. Not recommended for production use. Supported on iOS. (boolean) -
options: Optional parameters, currently only supports headers (such as Authorization (Basic Authentication), etc).
// !! Assumes variable fileURL contains a valid URL to a path on the device,
// for example, cdvfile://localhost/persistent/path/to/downloads/
var fileTransfer = new FileTransfer();
var uri = encodeURI("http://some.server.com/download.php");
fileTransfer.download(
uri,
fileURL,
function(entry) {
console.log("download complete: " + entry.toURL());
},
function(error) {
console.log("download error source " + error.source);
console.log("download error target " + error.target);
console.log("download error code" + error.code);
},
false,
{
headers: {
"Authorization": "Basic dGVzdHVzZXJuYW1lOnRlc3RwYXNzd29yZA=="
}
}
);- withCredentials: boolean that tells the browser to set the withCredentials flag on the XMLHttpRequest
Aborts an in-progress transfer. The onerror callback is passed a FileTransferError object which has an error code of FileTransferError.ABORT_ERR.
// !! Assumes variable fileURL contains a valid URL to a text file on the device,
// for example, cdvfile://localhost/persistent/path/to/file.txt
var win = function(r) {
console.log("Should not be called.");
}
var fail = function(error) {
// error.code == FileTransferError.ABORT_ERR
alert("An error has occurred: Code = " + error.code);
console.log("upload error source " + error.source);
console.log("upload error target " + error.target);
}
var options = new FileUploadOptions();
options.fileKey="file";
options.fileName="myphoto.jpg";
options.mimeType="image/jpeg";
var ft = new FileTransfer();
ft.upload(fileURL, encodeURI("http://some.server.com/upload.php"), win, fail, options);
ft.abort();A FileTransferError object is passed to an error callback when an error occurs.
-
code: One of the predefined error codes listed below. (Number)
-
source: URL to the source. (String)
-
target: URL to the target. (String)
-
http_status: HTTP status code. This attribute is only available when a response code is received from the HTTP connection. (Number)
-
body Response body. This attribute is only available when a response is received from the HTTP connection. (String)
-
exception: Either e.getMessage or e.toString (String)
exception is never defined.
- 1 =
FileTransferError.FILE_NOT_FOUND_ERR - 2 =
FileTransferError.INVALID_URL_ERR - 3 =
FileTransferError.CONNECTION_ERR - 4 =
FileTransferError.ABORT_ERR - 5 =
FileTransferError.NOT_MODIFIED_ERR
Previous versions of this plugin would only accept device-absolute-file-paths as the source for uploads, or as the target for downloads. These paths would typically be of the form:
/var/mobile/Applications/<application UUID>/Documents/path/to/file (iOS)
/storage/emulated/0/path/to/file (Android)
For backwards compatibility, these paths are still accepted, and if your application has recorded paths like these in persistent storage, then they can continue to be used.
These paths were previously exposed in the fullPath property of FileEntry and DirectoryEntry objects returned by the File plugin. New versions of the File plugin however, no longer expose these paths to JavaScript.
If you are upgrading to a new (1.0.0 or newer) version of File, and you have previously been using entry.fullPath as arguments to download() or upload(), then you will need to change your code to use filesystem URLs instead.
FileEntry.toURL() and DirectoryEntry.toURL() return a filesystem URL of the form:
cdvfile://localhost/persistent/path/to/file
which can be used in place of the absolute file path in both download() and upload() methods.
Use the File-Transfer plugin to upload and download files. In these examples, we demonstrate several tasks like:
- Downloading a binary file to the application cache
- Uploading a file created in your application's root
- Downloading the uploaded file
Use the File plugin with the File-Transfer plugin to provide a target for the files that you download (the target must be a FileEntry object). Before you download the file, create a DirectoryEntry object by using resolveLocalFileSystemURL and calling fs.root in the success callback. Use the getFile method of DirectoryEntry to create the target file.
window.requestFileSystem(window.TEMPORARY, 5 * 1024 * 1024, function (fs) {
console.log('file system open: ' + fs.name);
// Make sure you add the domain name to the Content-Security-Policy <meta> element.
var url = 'http://cordova.apache.org/static/img/cordova_bot.png';
// Parameters passed to getFile create a new file or return the file if it already exists.
fs.root.getFile('downloaded-image.png', { create: true, exclusive: false }, function (fileEntry) {
download(fileEntry, url, true);
}, onErrorCreateFile);
}, onErrorLoadFs);Note For persistent storage, pass LocalFileSystem.PERSISTENT to requestFileSystem.
When you have the FileEntry object, download the file using the download method of the FileTransfer object. The 3rd argument to the download function of FileTransfer is the success callback, which you can use to call the app's readBinaryFile function. In this code example, the entry variable is a new FileEntry object that receives the result of the download operation.
function download(fileEntry, uri, readBinaryData) {
var fileTransfer = new FileTransfer();
var fileURL = fileEntry.toURL();
fileTransfer.download(
uri,
fileURL,
function (entry) {
console.log("Successful download...");
console.log("download complete: " + entry.toURL());
if (readBinaryData) {
// Read the file...
readBinaryFile(entry);
}
else {
// Or just display it.
displayImageByFileURL(entry);
}
},
function (error) {
console.log("download error source " + error.source);
console.log("download error target " + error.target);
console.log("upload error code" + error.code);
},
null, // or, pass false
{
//headers: {
// "Authorization": "Basic dGVzdHVzZXJuYW1lOnRlc3RwYXNzd29yZA=="
//}
}
);
}If you just need to display the image, take the FileEntry to call its toURL() function.
function displayImageByFileURL(fileEntry) {
var elem = document.getElementById('imageElement');
elem.src = fileEntry.toURL();
}Depending on your app requirements, you may want to read the file. To support operations with binary files, FileReader supports two methods, readAsBinaryString and readAsArrayBuffer. In this example, use readAsArrayBuffer and pass the FileEntry object to the method. Once you read the file successfully, construct a Blob object using the result of the read.
function readBinaryFile(fileEntry) {
fileEntry.file(function (file) {
var reader = new FileReader();
reader.onloadend = function() {
console.log("Successful file read: " + this.result);
// displayFileData(fileEntry.fullPath + ": " + this.result);
var blob = new Blob([new Uint8Array(this.result)], { type: "image/png" });
displayImage(blob);
};
reader.readAsArrayBuffer(file);
}, onErrorReadFile);
}Once you read the file successfully, you can create a DOM URL string using createObjectURL, and then display the image.
function displayImage(blob) {
// Note: Use window.URL.revokeObjectURL when finished with image.
var objURL = window.URL.createObjectURL(blob);
// Displays image if result is a valid DOM string for an image.
var elem = document.getElementById('imageElement');
elem.src = objURL;
}As you saw previously, you can call FileEntry.toURL() instead to just display the downloaded image (skip the file read).
When you upload a File using the File-Transfer plugin, use the File plugin to provide files for upload (again, they must be FileEntry objects). Before you can upload anything, create a file for upload using the getFile method of DirectoryEntry. In this example, create the file in the application's cache (fs.root). Then call the app's writeFile function so you have some content to upload.
function onUploadFile() {
window.requestFileSystem(window.TEMPORARY, 5 * 1024 * 1024, function (fs) {
console.log('file system open: ' + fs.name);
var fileName = "uploadSource.txt";
var dirEntry = fs.root;
dirEntry.getFile(fileName, { create: true, exclusive: false }, function (fileEntry) {
// Write something to the file before uploading it.
writeFile(fileEntry);
}, onErrorCreateFile);
}, onErrorLoadFs);
}In this example, create some simple content, and then call the app's upload function.
function writeFile(fileEntry, dataObj) {
// Create a FileWriter object for our FileEntry (log.txt).
fileEntry.createWriter(function (fileWriter) {
fileWriter.onwriteend = function () {
console.log("Successful file write...");
upload(fileEntry);
};
fileWriter.onerror = function (e) {
console.log("Failed file write: " + e.toString());
};
if (!dataObj) {
dataObj = new Blob(['file data to upload'], { type: 'text/plain' });
}
fileWriter.write(dataObj);
});
}Forward the FileEntry object to the upload function. To perform the actual upload, use the upload function of the FileTransfer object.
function upload(fileEntry) {
// !! Assumes variable fileURL contains a valid URL to a text file on the device,
var fileURL = fileEntry.toURL();
var success = function (r) {
console.log("Successful upload...");
console.log("Code = " + r.responseCode);
// displayFileData(fileEntry.fullPath + " (content uploaded to server)");
}
var fail = function (error) {
alert("An error has occurred: Code = " + error.code);
}
var options = new FileUploadOptions();
options.fileKey = "file";
options.fileName = fileURL.substr(fileURL.lastIndexOf('/') + 1);
options.mimeType = "text/plain";
var params = {};
params.value1 = "test";
params.value2 = "param";
options.params = params;
var ft = new FileTransfer();
// SERVER must be a URL that can handle the request, like
// http://some.server.com/upload.php
ft.upload(fileURL, encodeURI(SERVER), success, fail, options);
};To download the image you just uploaded, you will need a valid URL that can handle the request, for example, http://some.server.com/download.php. Again, the success handler for the FileTransfer.download method receives a FileEntry object. The main difference here from previous examples is that we call FileReader.readAsText to read the result of the download operation, because we uploaded a file with text content.
function download(fileEntry, uri) {
var fileTransfer = new FileTransfer();
var fileURL = fileEntry.toURL();
fileTransfer.download(
uri,
fileURL,
function (entry) {
console.log("Successful download...");
console.log("download complete: " + entry.toURL());
readFile(entry);
},
function (error) {
console.log("download error source " + error.source);
console.log("download error target " + error.target);
console.log("upload error code" + error.code);
},
null, // or, pass false
{
//headers: {
// "Authorization": "Basic dGVzdHVzZXJuYW1lOnRlc3RwYXNzd29yZA=="
//}
}
);
}In the readFile function, call the readAsText method of the FileReader object.
function readFile(fileEntry) {
fileEntry.file(function (file) {
var reader = new FileReader();
reader.onloadend = function () {
console.log("Successful file read: " + this.result);
// displayFileData(fileEntry.fullPath + ": " + this.result);
};
reader.readAsText(file);
}, onErrorReadFile);
}
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