Is there any way I can make this function synchronous, or add a callback function to run when it's finished?

var fbGetLeagues = function(fb) {
  var leagues = [];
  fb.child('leagues').once('value', function(snapshot) {
    snapshot.forEach(function(child) {
      var id = child.name();
      var name = child.child('name').val();
      leagues.push({'id': id, 'name': name});
    });
  });
  return leagues;
};

Is there any way I can make this function synchronous, or add a callback function to run when it's finished?

var fbGetLeagues = function(fb) {
  var leagues = [];
  fb.child('leagues').once('value', function(snapshot) {
    snapshot.forEach(function(child) {
      var id = child.name();
      var name = child.child('name').val();
      leagues.push({'id': id, 'name': name});
    });
  });
  return leagues;
};

• javascript
• firebase

• 1 Why would you want to? Generally, making an async function synchronous is not the answer (but in some cases there are, so I'm curious) – tymeJV Commented Jan 9, 2014 at 14:24
• 1 Actually, I just want to run code when all the leagues are fetched, a callback would be good to. – Viktor Sehr Commented Jan 9, 2014 at 14:28

1 Answer 1

Just include a callback & Run if after your forEach:

var dbGetLeagues = function(fb, callback) {
    snapshot.forEach(function(child) {
      var id = child.name();
      var name = child.child('name').val();
      leagues.push({'id': id, 'name': name});
    });
    callback(leagues);
}

And call the code like:

dbGetLeagues(fb, function(leagues) {
    console.log(leagues);
});