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.

LocalFileSystem

This object provides a way to obtain root file systems.

Methods

  • requestFileSystem: Requests a filesystem. (Function)

  • resolveLocalFileSystemURI: Retrieve a DirectoryEntry or FileEntry using local URI. (Function)

Constants

  • LocalFileSystem.PERSISTENT: Used for storage that should not be removed by the user agent without application or user permission.

  • LocalFileSystem.TEMPORARY: Used for storage with no guarantee of persistence.

Details

The LocalFileSystem object methods are defined on the window object.

Supported Platforms

  • Amazon Fire OS
  • Android
  • BlackBerry 10
  • iOS
  • Windows Phone 7 and 8
  • Windows 8

Request File System Quick Example

function onSuccess(fileSystem) {
    console.log(fileSystem.name);
}

// request the persistent file system
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, onSuccess, onError);

Resolve Local File System URI Quick Example

function onSuccess(fileEntry) {
    console.log(fileEntry.name);
}

window.resolveLocalFileSystemURI("file:///example.txt", onSuccess, onError);

Full Example

<!DOCTYPE html>
<html>
  <head>
    <title>Local File System Example</title>

    <script type="text/javascript" charset="utf-8" src="cordova.js"></script>
    <script type="text/javascript" charset="utf-8">

    // Wait for device API libraries to load
    //
    document.addEventListener("deviceready", onDeviceReady, false);

    // device APIs are available
    //
    function onDeviceReady() {
        window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, onFileSystemSuccess, fail);
        window.resolveLocalFileSystemURI("file:///example.txt", onResolveSuccess, fail);
    }

    function onFileSystemSuccess(fileSystem) {
        console.log(fileSystem.name);
    }

    function onResolveSuccess(fileEntry) {
        console.log(fileEntry.name);
    }

    function fail(error) {
        console.log(error.code);
    }

    </script>
  </head>
  <body>
    <h1>Example</h1>
    <p>Local File System</p>
  </body>
</html>

requestFileSystem

Request a file system in which to store application data.

 window.requestFileSystem(type, size, successCallback, errorCallback)
  • window: reference to the global window object
  • type: local file system type, see LocalFileSystem Constants
  • size: indicates how much storage space, in bytes, the application expects to need
  • successCallback: invoked with a FileSystem object
  • errorCallback: invoked if error occurs retrieving file system

Request File System Quick Example

function onSuccess(fileSystem) {
    console.log(fileSystem.name);
}

// request the persistent file system
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, onSuccess, onError);