get facebook login with js (backup from: http://stackoverflow.com/questions/24314431/how-to-get-access-token-from-node-webkit-for-a-desktop-app-without-hosting-page)

gistfile1.js

var url = "https://www.facebook.com/dialog/oauth?&client_id=myBigClientID&redirect_uri=https://www.facebook.com/connect/login_success.html&response_type=token&scope=publish_actions";

function Response() {
  this.access_token = null; 
  this.expires_in  = null;
};

var response = new Response();

//function called every 500ms to check if token is in url
window.hashUpdate = function() {
  if(window.loginWindow.closed){
    window.clearInterval(intervalId);
    start(); //just a callback that I'm using to start another part of my application (after I caught the token)
  }
  else {
    var url = window.loginWindow.document.URL;
    var tabUrl = url.split("#"); //first split to separate the domain part and the parameter part
    var paramString = tabUrl[1]; //I concerned only by the second part after the '#'
    if(paramString != undefined){
      var allParam = paramString.split("&");
      for (var i = 0; i < allParam.length; i++) {
        var oneParamKeyValue = allParam[i].split("=");
        response[oneParamKeyValue[0]] = oneParamKeyValue[1]; //store my token in form of key => value
      };

      //close the window after 1500ms
      setTimeout(function(){
        window.loginWindow.close();
      }, 1500);
    }

  }
}

//open the url and start the watching process
window.loginWindow = window.open(this.url, 'Login facebook', false);
this.intervalId = window.setInterval("window.hashUpdate()", 500);