how to append to file with cordova-plugin-file

Question

I'm trying to append text to a file.

I have followed tutorial of Html5rocks as suggested by plugins's github page.

I've sucessfully created a file and wrote to it. But when im trying to append text, i got a write success event but no text is added. I'm only able to change characters but no characted added to the end. It's not an async issue, i'm also trying live test with chrome's js console. Im also using fileWriter.seek(fileWriter.length) before trying to write at the end. (but seek(0) to write a the beginning)

there is the module i wrote :

'use strict';

function File_mgmt(name) {
    var name = name;

    var myfile = '';

    var next_write = '';

    var that = this;

    var errorHandler = function (e) {

        var msg = '';

        switch (e.code) {
            case FileError.QUOTA_EXCEEDED_ERR:
              msg = 'QUOTA_EXCEEDED_ERR';
              break;
            case FileError.NOT_FOUND_ERR:
              msg = 'NOT_FOUND_ERR';
              break;
            case FileError.SECURITY_ERR:
              msg = 'SECURITY_ERR';
              break;
            case FileError.INVALID_MODIFICATION_ERR:
              msg = 'INVALID_MODIFICATION_ERR';
              break;
            case FileError.INVALID_STATE_ERR:
              msg = 'INVALID_STATE_ERR';
              break;
            default:
              msg = 'Unknown Error';
              break;
        };

        console.log('Error: ' + msg);
    };


    var init = function() {
        console.log("init");
        request(gotFS);
    };

    var gotFS = function() {
        console.log("gotfs");
        window.resolveLocalFileSystemURL(cordova.file.externalDataDirectory, function(dir) { 
            dir.getFile(name, {create:true}, function(file) {
                myfile = file;
            }, errorHandler);
        });
    };

    this.write = function (data) {
        myfile.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.
            fileWriter.seek(fileWriter.length);

            fileWriter.write(data);

        }, errorHandler);


    };

    this.reopen = function() {
        window.resolveLocalFileSystemURL(cordova.file.externalDataDirectory, function(dir) { 

            dir.getFile(name, {create:false}, function(file) {
                myfile = file;
            }, errorHandler);
        });

    };

    this.getfile = function() {
        return myfile;
    };

    this.writeTextBlob = function(data) {
        this.write(new Blob([data], {type: 'text/plain'}));
    };

    var request = function(success){
        var fail = function() {console.log("failed to initialise system")};
        window.requestFileSystem(LocalFileSystem.PERSISTENT, 1024*1024, success, fail);
    };  

    var writer = function() {

        myfile.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.
            fileWriter.seek(fileWriter.length);

            fileWriter.write(next_write);

        }, errorHandler);
    };

    this.testWrite = function(data) {
        next_write = data;
        request(writer);

    };


    init();


    return this;

}

I'm using it with chrome console with

var f = new File_mgmt("test");
f.writeTextBlob("test1");
f.writeTextBlob("test2");

---

Edit

I've tried to pass by a window.requestFileSystem() to append but it still doesnt work, I've also updated my code.

now i'm doing

var f = new File_mgmt("test");
f.testWrite("test1");
f.testWrite("test2");

Answer 1

It's appearing than my file actually got new data. I had to unplugged then replugged usb cable to see the new data appened to my file.

May be it's a problem with Windows. I'll look if i got the same problem on linux.