license: Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
FileWriter is an object that allows one to write a file.
The FileWriter
object is a way to write files to the device file system (UTF-8 encoded). Users register their own event listeners to receive the writestart, progress, write, writeend, error and abort events.
A FileWriter is created for a single file. You can use it to write to a file multiple times. The FileWriter maintains the file‘s position and length attributes, so you can seek and write anywhere in the file. By default, the FileWriter writes to the beginning of the file (will overwrite existing data). Set the optional append boolean to true in the FileWriter’s constructor to begin writing to the end of the file.
function win(writer) { // fast forwards file pointer to end of file writer.seek(writer.length); }; var fail = function(evt) { console.log(error.code); }; entry.createWriter(win, fail);
function win(writer) { writer.truncate(10); }; var fail = function(evt) { console.log(error.code); }; entry.createWriter(win, fail);
function win(writer) { writer.onwrite = function(evt) { console.log("write success"); }; writer.write("some sample text"); }; var fail = function(evt) { console.log(error.code); }; entry.createWriter(win, fail);
function win(writer) { writer.onwrite = function(evt) { console.log("write success"); }; writer.seek(writer.length); writer.write("appended text"); }; var fail = function(evt) { console.log(error.code); }; entry.createWriter(win, fail);
function win(writer) { writer.onwrite = function(evt) { console.log("write success"); }; writer.write("some sample text"); writer.abort(); }; var fail = function(evt) { console.log(error.code); }; entry.createWriter(win, fail);
<!DOCTYPE html> <html> <head> <title>FileWriter Example</title> <script type="text/javascript" charset="utf-8" src="cordova-2.1.0.js"></script> <script type="text/javascript" charset="utf-8"> // Wait for Cordova to load // document.addEventListener("deviceready", onDeviceReady, false); // Cordova is ready // function onDeviceReady() { window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, gotFS, fail); } function gotFS(fileSystem) { fileSystem.root.getFile("readme.txt", {create: true, exclusive: false}, gotFileEntry, fail); } function gotFileEntry(fileEntry) { fileEntry.createWriter(gotFileWriter, fail); } function gotFileWriter(writer) { writer.onwriteend = function(evt) { console.log("contents of file now 'some sample text'"); writer.truncate(11); writer.onwriteend = function(evt) { console.log("contents of file now 'some sample'"); writer.seek(4); writer.write(" different text"); writer.onwriteend = function(evt){ console.log("contents of file now 'some different text'"); } }; }; writer.write("some sample text"); } function fail(error) { console.log(error.code); } </script> </head> <body> <h1>Example</h1> <p>Write File</p> </body> </html>