AngularJS 1.3.8 Using multiple controllers, second controller is not working

Question

How do you use multiple controllers for AngularJS 1.3.8?

I've tried the following below but only the first controller outputs correctly and the second controller outputs with {{ name }} and {{ age }}.

HTML:

<div ng-app="app" ng-controller="Ctrl">
    <label>Name:</label>
        <input ng-model="name">
    <label>Age:</label>
        <input ng-model="age">
    <h1>{{ name }}</h1>
    <h1>{{ age * 2 }}</h1>
</div>

<div ng-app="app2" ng-controller="Ctrl2">
    <label>Name:</label>
        <input ng-model="name">
    <label>Age:</label>
        <input ng-model="age">
    <h1>{{ name }}</h1>
    <h1>{{ age }}</h1>
</div>

<script>
    angular.module('app', [])
        .controller('Ctrl', ['$scope', function($scope) {
            $scope.name = "Jason";
            $scope.age = "21";
            $scope.$watch('name', function(){ // Logs the amount of times name changes
               console.log($scope.name);
            });
        }]);
</script>

<script>
    angular.module('app2', [])
        .controller('Ctrl2', ['$scope', function($scope) {
            $scope.name = "John";
            $scope.age = "22";
        }]);
</script>

Answer 1

You cannot have more than 1 ng-app directive in the same document. You would need to manually bootstrap the other. Other wise only the first instance of ng-app will be bootstrapped automatically by angular.

Other issue is that there is no provider called $scope2, you need to inject $scope.

Example:-

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.8/angular.min.js"></script>
<div ng-app="app" ng-controller="Ctrl">
  <label>Name:</label>
  <input ng-model="name">
  <label>Age:</label>
  <input ng-model="age">
  <h1>{{ name }}</h1>
  <h1>{{ age * 2 }}</h1>
</div>

<div id="app2" ng-controller="Ctrl2">
  <label>Name:</label>
  <input ng-model="name">
  <label>Age:</label>
  <input ng-model="age">
  <h1>{{ name }}</h1>
  <h1>{{ age }}</h1>
</div>

<script>
  angular.module('app', [])
    .controller('Ctrl', ['$scope',
      function($scope) {
        $scope.name = "Jason";
        $scope.age = "21";
        $scope.$watch('name', function() { // Logs the amount of times name changes
          console.log($scope.name);
        });
      }
    ]);
</script>

<script>
  angular.module('app2', [])
    .controller('Ctrl2', ['$scope',
      function($scope) {
        $scope.name = "John";
        $scope.age = "22";
      }
    ]);
  angular.element(document).ready(function() {
    angular.bootstrap(document.getElementById('app2'), ['app2']);
  });
</script>

Demo

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.8/angular.min.js"></script>
<div ng-app="app" ng-controller="Ctrl">
  <label>Name:</label>
  <input ng-model="name">
  <label>Age:</label>
  <input ng-model="age">
  <h1>{{ name }}</h1>
  <h1>{{ age * 2 }}</h1>
</div>

<div id="app2" ng-controller="Ctrl2">
  <label>Name:</label>
  <input ng-model="name">
  <label>Age:</label>
  <input ng-model="age">
  <h1>{{ name }}</h1>
  <h1>{{ age }}</h1>
</div>

<script>
  angular.module('app', [])
    .controller('Ctrl', ['$scope',
      function($scope) {
        $scope.name = "Jason";
        $scope.age = "21";
        $scope.$watch('name', function() { // Logs the amount of times name changes
          console.log($scope.name);
        });
      }
    ]);
</script>

<script>
  angular.module('app2', [])
    .controller('Ctrl2', ['$scope',
      function($scope) {
        $scope.name = "John";
        $scope.age = "22";
      }
    ]);
  angular.element(document).ready(function() {
    angular.bootstrap(document.getElementById('app2'), ['app2']);
  });
</script>

If your intention is to use just one module and bind other controllers to it. Then just have one ng-app and register your controller to app1.

Create a module:

 angular.module('app', []);

Register a controller:

 angular.module('app').controller('Ctrl1', ctor);

Demo

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.8/angular.min.js"></script>
<div ng-app="app">
  <div ng-controller="Ctrl">
    <label>Name:</label>
    <input ng-model="name">
    <label>Age:</label>
    <input ng-model="age">
    <h1>{{ name }}</h1>
    <h1>{{ age * 2 }}</h1>
  </div>

  <div ng-controller="Ctrl2">
    <label>Name:</label>
    <input ng-model="name">
    <label>Age:</label>
    <input ng-model="age">
    <h1>{{ name }}</h1>
    <h1>{{ age }}</h1>
  </div>
</div>
<script>
  angular.module('app', [])
    .controller('Ctrl', ['$scope',
      function($scope) {
        $scope.name = "Jason";
        $scope.age = "21";
        $scope.$watch('name', function() { // Logs the amount of times name changes
          console.log($scope.name);
        });
      }
    ]).controller('Ctrl2', ['$scope',
      function($scope) {
        $scope.name = "John";
        $scope.age = "22";
      }
    ]);;
</script>