AngularJS: lazy loading controllers and content

Question

In this simplified scenario, I have two files: index.htm, lazy.htm.

index.htm:

var myApp = angular.module('myApp', []);
myApp.controller('embed',function($scope){
    $scope.embed = 'Embedded Controller';
});                  
<div ng-controller="embed">{{embed}}</div>    
<div ng-include="'lazy.htm'"></div>

lazy.htm

myApp.controller('lazy',function($scope){
    $scope.lazy = 'Lazy Controller';
});
<div ng-controller="lazy">
    {{lazy}}
</div>

The result is an error: "Argument 'lazy' is not a function, got undefined"

Using a function instead

lazy.htm

function lazy($scope) {
    $scope.lazy = 'Lazy Controller';
}
<div ng-controller="lazy">
    {{lazy}}
</div>

This works until version 1.3 beta 14. In beta 15 was removed the global controller functions: https://github.com/angular/angular.js/issues/8296

So now, what is the better way to get angularized contents of lazy.htm dynamically?

UPDATE:

In this article (http://ify.io/lazy-loading-in-angularjs) I found another possible solution. The $controllerProvider allow us to register new controllers after angular bootstrap. Works like a charm. Tested in v1.3.0-beta.18

index.htm:

var myApp = angular.module('myApp', [])
.controller('embed',function($scope){
    $scope.embed = 'Embedded Controller';
})
.config(function($controllerProvider) {
    myApp.cp = $controllerProvider;
});

<div ng-controller="embed">{{embed}}</div>    
<div ng-include="'lazy.htm'"></div>

lazy.htm

myApp.cp.register('lazy',function($scope){
    $scope.lazy = 'Lazy Controller';
});
<div ng-controller="lazy">
    {{lazy}}
</div>

UPDATE 2:

Two other alternatives that works are:

lazy.htm

_app = $('[ng-app]').scope();    
_app.lazy = function($scope) {
    $scope.lazy = 'Lazy Controller';
};

OR

var $rootScope = $('[ng-app]').injector().get('$rootScope');        
$rootScope.lazy = function($scope) {
    $scope.lazy = 'Lazy Controller';
}; 

But I believe these last two examples should not be used in production.

Answer 1

////JConfig file--------

window.angularApp.config(function ($routeProvider,$controllerProvider,$compileProvider,$provide, azMessages) {

$routeProvider.when('/login', {
             resolve: {
                 load: ['$q', '$rootScope', function ($q, $rootScope) {
                     var deferred = $q.defer();
                     require([

                         //load required Js file here

                ], function () {
                    $rootScope.$apply(function () {
                        deferred.resolve();
                    });
                });
                     return deferred.promise;
                 } ]
             }
         });


  $routeProvider.otherwise({ redirectTo: '/login' });

    window.angularApp.components = {
        controller: $controllerProvider.register,
        service: $provide.service,
        directive: $compileProvider.directive
    }

//contoller declaration

angularApp.components.controller('DiscussionController',[function(){

}]);

Answer 2

Try this ARI plugin for Angular JS. It helps you to lazy load the controller scripts on demand.

Answer 3

At first I utilized André Betiolo's answer. However, it does not always work becasue the ajax loading is non-blocking causing the view to sometimes request the controller prior to the script being loaded.

As a solution i forced the function not to return until all scripts successfully loaded. This is kind of hackish but makes sure the loads are successful prior to completing the resolve. It also allows for loading of multiple controllers.

app.js

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

app.config(['$routeProvider', '$controllerProvider', function($routeProvider, $controllerProvider){

    /*Creating a more synthesized form of service of $ controllerProvider.register*/
    app.registerCtrl = $controllerProvider.register;

    //jquery to dynamically include controllers as needed
    function controllers(controllers){
        var numLoaded = 0;
        for (i = 0; i < controllers.length; i++) {
            $.ajaxSetup({async:false});
            $.getScript('js/controllers/' + controllers[i] + '.js').success(function(){
                numLoaded++;
                if (numLoaded == controllers.length) {
                    return true; //only return after all scripts are loaded, this is blocking, and will fail if all scripts aren't loaded.
                }
            });
        }
    }

    $routeProvider
        .when('/', {
            templateUrl: 'views/foo.html',
            resolve: {
                load: function () {
                    controllers(['foo'])
                }
            }
        })
        .when('/bar',{
            templateUrl: 'views/bar.html',
            controller: 'BarCtrl',
            resolve: {
                load: function () {
                    controllers(['bar','foo']) //you can load multiple controller files
                }
            }
        })
        .otherwise({
            redirectTo: document.location.pathname
        });
}]);

/views/foo.html

<section ng-controller='FooCtrl'>
    {{text}}
</section>

/views/bar.html

<section ng-controller='BarCtrl'>
    {{text2}}
</section>
<section ng-controller='FooCtrl'>
    {{text}}
</section>

/controllers/bar.js

app.registerCtrl('BarCtrl',function($scope){
    $scope.text2 = 'Test';
});