Is it possible to utilize Angular's dependency injection in place of RequireJS?

As a newcomer to Angular, I am wondering how I can organize my code into separate files without using requirejs or any other framework. After watching a brief introductory video, it seemed possible.

Currently, my app looks like this and functions well:

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

app.factory('ExampleFactory', function () {
   var factory = {};
   factory.something = function(){
   /*some code*/
   }
   return factory;
});


app.controller ('ExampleCtrl', function($scope, ExampleFactory){
   $scope.something = function(){
      ExampleFactory.something();
    };
});

app.config(function ($routeProvider) {
    $routeProvider
    .when('/',
    {
    controller: 'ExampleCtrl',
        templateUrl: 'views/ExampleView.html'
    })
    .otherwise({ redirectTo: '/' });
});

If I wanted to split this into separate files, the structure would look something like this:

File One:

   angular.module('factoryOne', [])
   .factory('ExampleFactory', function () {
       var factory = {};
       factory.something = function(){
       /*some code*/
       }
       return factory;
   });

File Two:

  angular.module('controllerOne', ['factoryOne'])
  .controller ('ExampleCtrl', function($scope,ExampleFactory){
      $scope.something = function(){
      ExampleFactory.something();
      };
  });

File Three:

angular.module('routes', ['controllerOne'])
.config(function ($routeProvider) {
     $routeProvider
     .when('/',
     {
    controller: 'ExampleCtrl',
        templateUrl: 'views/ExampleView.html'
     })
    .otherwise({ redirectTo: '/' });
 });

File four:

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

I attempted this method but encountered issues. Can I simply include File Four with one script tag in the main view, or do I need a tag for each file? Any guidance is appreciated.

Answer №1

Unlike some other frameworks, AngularJS does not come equipped with a built-in script loader. If you need to load dependencies, you'll have to turn to third-party solutions like RequireJS or script.js.

Referencing the official documentation (http://docs.angularjs.org/guide/module#asynchronousloading):

Asynchronous Loading

Modules in AngularJS handle $injector configuration and do not deal with loading scripts into a VM. External projects are available for script loading purposes when working with Angular. Since modules don't affect loading order, script loaders can optimize loading by running tasks in parallel.

Alternatively, as mentioned by @xanadont, you can manually insert <script> tags on your webpage for each file.

Answer №2

It is essential to include a

<script src="file.js"></script>

tag for each file you are utilizing. Once all the references are properly set up, everything should function smoothly.

Alternatively, you can explore this article for a method on how to dynamically resolve controllers at runtime.

Answer №3

To effectively manage the process of adding individual files to your Angular project, it's essential to differentiate between downloading and loading/executing in-memory. Utilize tools like Yeoman or grunt to streamline this process, ensuring that each file associated with Angular's various modules (controllers, directives, services, etc.) is properly integrated. During build-time, these files will be minified and concatenated, resulting in a significant improvement in speed and bandwidth efficiency compared to lazy-loading individual files.

Once the files are sorted, Angular takes care of the remaining tasks by executing dependencies only when necessary.

In the scenario mentioned above, @Jose, the issue you encountered stemmed from not correctly attaching dependencies to the original module. Instead of creating new modules and nesting dependencies within them, make sure to attach these dependencies directly to the main 'app' module. In the initial version, using var app cached the reference to the 'app' module, allowing for operations like app.controller(). This way, the .controller() method is called on the 'app' module itself.

In the revised approach, remember to link those dependencies to the primary 'app' module. Access the original module by calling angular.module('app'), followed by chaining calls to .controller() or .directive() once the module has been retrieved.

Ultimately, leverage Angular's mechanisms for handling dependencies efficiently. If you still wish to incorporate Require for third-party scripts after addressing these considerations, feel free to do so. However, it's advisable to conduct testing beforehand to assess whether this adds genuine value to your project.

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