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\',         


        

Answer 1

You also can use Directives to load your controller!

A example here:

https://gist.github.com/raphaelluchini/53d08ed1331e47aa6a87

Answer 2

You can also use the jquery with the resolve the $routeProvider

app.js

/* Module Creation */
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;

function loadScript(path) {
  var result = $.Deferred(),
  script = document.createElement("script");
  script.async = "async";
  script.type = "text/javascript";
  script.src = path;
  script.onload = script.onreadystatechange = function (_, isAbort) {
      if (!script.readyState || /loaded|complete/.test(script.readyState)) {
         if (isAbort)
             result.reject();
         else
            result.resolve();
    }
  };
  script.onerror = function () { result.reject(); };
  document.querySelector("head").appendChild(script);
  return result.promise();
}

function loader(arrayName){

    return {
      load: function($q){
                var deferred = $q.defer(),
                map = arrayName.map(function(name) {
                    return loadScript('js/controllers/'+name+".js");
                });

                $q.all(map).then(function(r){
                    deferred.resolve();
                });

                return deferred.promise;
        }
    };
}

$routeProvider  
    .when('/', {
        templateUrl: 'views/foo.html',
        resolve: loader(['foo'])
    })
    .when('/bar',{
        templateUrl: 'views/bar.html',
        controller: 'BarCtrl',
        resolve: loader(['bar'])
    })
    .otherwise({
        redirectTo: document.location.pathname
    });
}]);

/views/foo.html

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

js/controllers/foo.js

/*Here we use the synthesized version of $controllerProvider.register 
to register the controller in view*/
app.registerCtrl('FooCtrl',function($scope){
    $scope.text = 'Test';
});

/views/bar.html

<section>
    {{text2}}
</section>

js/controllers/bar.js

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

Answer 3

You can have pure AngularJS lazy loading.

Create "LazyService":

var ng = angular.module('app');

ng.factory('lazyService', [ '$http', function($http) {
    var jsPath = 'js/${ name }.js';
    var promisesCache = {};

    return {
        loadScript: function(name) {
            var path = jsPath.replace('${ name }', name);
            var promise = promisesCache[name];
            if (!promise) {
                promise = $http.get(path);
                promisesCache[name] = promise;

                return promise.then(function(result) {
                    eval(result.data);
                    console.info('Loaded: ' + path);
                });
            }

            return promise;
        }
    }
}]);

Then, define your config:

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

ng.config([ '$routeProvider', '$controllerProvider', '$provide', function($routeProvider, $controllerProvider, $provide) {
    // Lazy loading
    ng.lazy = {
        controller: $controllerProvider.register,
        //directive: $compileProvider.directive,
        //filter: $filterProvider.register,
        factory: $provide.factory,
        service: $provide.service
    }

    $routeProvider
    .when('/', {
        templateUrl: 'view/home.html'
    })
    .when('/vendor', {
        templateUrl: 'view/vendor.html',
        resolve: {
            svc: [ 'lazyService', function(lazyService) {
                return lazyService.loadScript('services/vendor');
            }],
            ctrl: [ 'lazyService', function(lazyService) {
                return lazyService.loadScript('controllers/vendor');
            }]
        }
    });
. . .

On "js/services/vendor.js", create service as:

var ng = angular.module('app');
ng.lazy.service('vendorService', [ function() {
. . .

On "js/controllers/vendor.js", create controller as:

var ng = angular.module('app');
ng.lazy.controller('vendorController', [ function() {
. . .

The "resolve" property on when defines which promises should be resolved before route loads.