src/chrome/test/data/extensions/platform_apps/file_access_saved_to_prefs_test/test.js

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 var textToWrite = 'def';
   6
   7 function truncateAndWriteToFile(writableEntry, callback) {
   8   writableEntry.createWriter(function(fileWriter) {
   9     fileWriter.onerror = function(e) {
  10       console.error("Couldn't write file: " + e.toString());
  11     };
  12     fileWriter.onwriteend = function(e) {
  13       fileWriter.onwriteend = function(e) {
  14         callback();
  15       };
  16       var blob = new Blob([textToWrite], {type: 'text/plain'});
  17       fileWriter.write(blob);
  18     };
  19     fileWriter.truncate(0);
  20   });
  21 }
  22
  23 chrome.app.runtime.onLaunched.addListener(function() {
  24   chrome.app.window.create('index.html', {width: 100, height: 100},
  25       function(win) {
  26     var fs = win.contentWindow.chrome.fileSystem;
  27     fs.chooseEntry({type: 'openFile'}, function(entry) {
  28       chrome.fileSystem.retainEntry(entry);
  29       fs.getWritableEntry(entry, function(writableEntry) {
  30         chrome.fileSystem.retainEntry(writableEntry);
  31         truncateAndWriteToFile(writableEntry, function() {
  32           chrome.test.sendMessage('fileWritten');
  33           win.close();
  34         });
  35       });
  36     });
  37   });
  38 });