angular controller communication with a service

Question

I want to communicate controllers with another.

var module = angular.module("app", []);

module.service("MessageAggregator", function(){
    var service = {};

    service.message = {};

    service.setMessage = function(message){
        service.message = message;
    };

    return service;
    });

    function firstController($scope, MessageAggregator){
        $scope.sendRequest = function(){
            MessageAggregator.setMessage({type: "FeatureSet"});
        };
    }

    function secondController($scope, MessageAggregator){
        $scope.info = MessageAggregator;
        $scope.message = MessageAggregator.message;
    }

I want to use MessageAggregator service data in html view.

<div ng-app="app">
    <div ng-controller="firstController">
        <button ng-click="sendRequest()">Request</button>
    </div>
    <hr/>
    <div ng-controller="secondController">
         <h3>info: {{info}}</h3>
         <h3>message: {{message}}</h3>
    </div>
</div>

Working code is here jsfiddle

<h3>message: {{message}}</h3>  not populated and working
<h3>info: {{info}}</h3> is working

Answer 1

You should make your controller in your module

module.controller("firstController", function($scope, MessageAggregator){
    $scope.sendRequest = function(){
        MessageAggregator.setMessage({type: "FeatureSet"});
    };
});

module.controller("secondController", function($scope, MessageAggregator){
    $scope.info = MessageAggregator;
    $scope.message = MessageAggregator.message;
});

Answer 2

You need to explicitely add watch listener for MessageAggregator.message object:

$scope.$watch(function() { return MessageAggregator.message; },
  function(newVal, oldVal) { $scope.message = newVal; });

Here is an Example

or you should to change the service.setMessage function as below to preserve message object reference:

service.setMessage = function (message) {
    for (var prop in message) {
        if (message.hasOwnProperty(prop)) {
            service.message[prop] = message[prop];
        }

        for(var prop in service.message){
            if(!message.hasOwnProperty(prop)){
                delete service.message[prop];
            }
        }
    }
};