FileSystemFileEntry

The FileSystemFileEntry interface of the File System API represents a file in a file system. It offers properties describing the file's attributes, as well as the file() method, which creates a File object that can be used to read the file.

Inherits the properties of its parent interface, FileSystemEntry, but has no properties unique to this interface.

file()

Creates a new File object which can be used to read the file.

createWriter()

Creates a new FileWriter object which allows writing to the file represented by the file system entry.

To write content to file, create a FileWriter object by calling createWriter(). To read a file, obtain a File object representing its contents by calling file().

The following code creates an empty file called "log.txt" (if it doesn't exist) and fills it with the text "Meow". Inside the success callback, event handlers are set up to handle the error error and writeend events. The text data is written to the file by creating a blob, appending text to it, and passing the blob to FileWriter.write().

function onInitFs(fs) {
  fs.root.getFile('log.txt', {create: true}, function(fileEntry) {

    // Create a FileWriter object for our FileSystemFileEntry (log.txt).
    fileEntry.createWriter(function(fileWriter) {
      fileWriter.onwriteend = function(e) {
        console.log('Write completed.');
      };

      fileWriter.onerror = function(e) {
        console.log('Write failed: ' + e.toString());
      };

      // Create a new Blob and write it to log.txt.
      var bb = new BlobBuilder();
      bb.append('Meow');

      fileWriter.write(bb.getBlob('text/plain'));
    }, errorHandler);

  }, errorHandler);

}

window.requestFileSystem(window.TEMPORARY, 1024*1024, onInitFs, errorHandler);

• File and Directory Entries API
• Introduction to the File System API