Firebase child_removed not working in real-time - angularjs

Question

I am following tutsplus Real time web apps with Angularjs and Firebase.
I have main.js (below) which allows me to add and change items in Firebase in real time with no refresh of the browser (in Chrome and Safari).
However when I delete a message from Firebase I have to refresh the browser for the message list to update - so not in real time. I can't see where the problem is.
/*global Firebase*/
'use strict';
/**
* #ngdoc function
* #name firebaseProjectApp.controller:MainCtrl
* #description
* # MainCtrl
* Controller of the firebaseProjectApp
*/
angular.module('firebaseProjectApp')
.controller('MainCtrl', function ($scope, $timeout) {
var rootRef = new Firebase('https://popping-inferno-9738.firebaseio.com/');
var messagesRef = rootRef.child('messages');
$scope.currentUser=null;
$scope.currentText=null;
$scope.messages=[];
messagesRef.on('child_added', function(snapshot){
$timeout(function() {
var snapshotVal = snapshot.val();
console.log(snapshotVal);
$scope.messages.push({
text: snapshotVal.text,
user: snapshotVal.user,
name: snapshot.key()
});
});
});
messagesRef.on('child_changed', function(snapshot){
$timeout(function() {
var snapshotVal = snapshot.val();
var message = findMessageByName(snapshot.key());
message.text = snapshotVal.text;
});
});
messagesRef.on('child_removed', function(snapshot){
$timeout(function() {
var snapshotVal = snapshot.val();
var message = findMessageByName(snapshot.key());
message.text = snapshotVal.text;
});
});
function deleteMessageByName(name){
for(var i=0; i < $scope.messages.length; i++){
var currentMessage = $scope.messages[i];
if(currentMessage.name === name){
$scope.messages.splice(i, 1);
break;
}
}
}
function findMessageByName(name){
var messageFound = null;
for(var i=0; i < $scope.messages.length; i++){
var currentMessage = $scope.messages[i];
if(currentMessage.name === name){
messageFound = currentMessage;
break;
}
}
return messageFound;
}
$scope.sendMessage = function(){
var newMessage = {
user: $scope.currentUser,
text: $scope.currentText
};
messagesRef.push(newMessage);
};
});

Answer 1

The code that is invoked when a message is deleted from Firebase:
messagesRef.on('child_removed', function(snapshot){
$timeout(function() {
var snapshotVal = snapshot.val();
var message = findMessageByName(snapshot.key());
message.text = snapshotVal.text;
});
});
This code never actually deletes the message from the HTML/DOM.
There is a convenient deleteMessageByName method to handle the deletion. So if you modify the above to this, it'll work:
messagesRef.on('child_removed', function(snapshot){
$timeout(function() {
deleteMessageByName(snapshot.key());
});
});