Using the HTML5 FileWriter truncate() method?

Question

I\'m experimenting with the HTML5 File API, and I\'m needing to use a method which I don\'t know enough about (simply because it\'s hardly documented anywhere).

I\'m tal

Answer 1

You need to be more async'y. :)

fileEntry.createWriter(function(fileWriter) {

  fileWriter.onwriteend = function(trunc) {
    fileWriter.onwriteend = null; // Avoid an infinite loop.
    // Create a new Blob and write it to log.txt.
    var bb = new BlobBuilder(); // Note: window.WebKitBlobBuilder in Chrome 12.
    bb.append('Hello World');
    fileWriter.write(bb.getBlob('text/plain'));
  }

  fileWriter.seek(fileWriter.length); // Start write position at EOF.
  fileWriter.truncate(1);

}, errorHandler);