ref.once() not called on Firebase

Question

I am puzzeled with the following issue. While making a little web page to see some data I have on Firebase, there is some place where I cannot access what I want. Of course I know there is something at this place on the server. Here is the code, it seems localRef.once() is never called.

var dbLocalURL = "https://atinytestapp.firebaseio.com/MyList/rc99/";
var localRef = new Firebase(dbLocalURL);
localRef.once("value", function(snapshot) {
    // WE NEVER COME HERE !!!!
    for (record in snapshot.val()) {
        document.write(record)
        var recordRef = new Firebase(dbLocalURL+record+"/");
        recordRef.once("value", function(rcdSnapshot) {
            var rcdData = rcdSnapshot.val();
            document.write(rcdData[“someKey”])
        })
    }
}, function (errorObject) {
    // WE NEVER COME HERE !!!!
    console.log("The read failed: " + errorObject.code);
    document.write("The read failed: " + errorObject.code);
});

My page accessing the data is working as it should about everywhere, except in one place with the above behaviour. Beside I have also checked that the URL I use is correct, by pasting it into a browser and seeing the data I expect. What can I be missing? I hope someone can give me a hint.

Solution

(note: this is the new Firebase 3 way) This wasn't included in the code in the question but here's the initialization on (here for completeness)

// Set the configuration for your app: Replace with your project's config object
  var config = {
    apiKey: '<your-api-key>',
    authDomain: '<your-auth-domain>',
    databaseURL: '<your-database-url>',
    storageBucket: '<your-storage-bucket>'
  };
  firebase.initializeApp(config);

  // Get a reference to the database service
  var database = firebase.database();

and assuming you want to just read the data once:

firebase.database().ref('MyList/rc99').once('value').then(function(snapshot) {
    for (record in snapshot.val()) { //unordered records, see comment
       document.write(record)
       ...

Firebase 2

var ref = new Firebase("https://atinytestapp.firebaseio.com/MyList/rc99/");

ref.on("value", function(snapshot) {
  snapshot.forEach(function(record) { //ordered records, see comment
    document.write(record)
    ...
});

Note: make sure the url is correct as if that's malformed it won't work at all. I tried your url and it doesn't seem to be responding.