An error related to Angular module injection occurs while trying to execute my application

Question

An error related to Angular module injection occurs while trying to execute my application

I'm new to Angular and I'm a bit confused by this error message. I'm not sure where I went wrong, but my console is displaying the following error:

angular.js:38 Uncaught Error: [$injector:modulerr] http://errors.angularjs.org/1.5.8/$injector/modulerr?p0=app&p1=Error%3A%20%…(http%3A%2F%2Flocalhost%3A8080%2Flib%2Fangular%2Fangular.min.js%3A21%3A179)(…)

Here's my html code:

<!DOCTYPE html>
<html lang="en" ng-app="app">
<head>
   <link rel="stylesheet" href="css/app.min.css">
   <script src="lib/angular/angular.min.js"></script>
   <script src="lib/angular-route/angular-route.min.js"></script>
   <script src="lib/angular-resource/angular-resource.min.js></script>
   <script src="js/app.js"></script>
   <script src="js/controller.js"></script>
</head>
<body>
    test
</body>
</html>

And here's my app.js code:

(function() {
   'use strict';
    angular.module('app', [
        'ngRoute',
        'ngResource',
        'mainController'
    ])
   .config(['$routeProvider', function() {
       routeProvider.when("/", {templateUrl: 'www/index.html', controller:      'mainController'})
   }])

   .controller('mainController', function($scope){
      alert();
   })
 })();

Can someone help me figure out what's wrong?

javascript angularjs

Answer 1

Answer №1

Instead of being a separate module, the mainController is actually a controller within your existing app module. Therefore, injecting mainController as a dependency does not belong here. Make sure to remove the mainController injection from your modules dependencies array.

On the other hand, ngRoute and ngResources are modules that your module relies on - for example, $routeProvider comes from ngRoute module. To access $routeProvider, you must inject the ngRoute module as a dependency.

Answer 2

Instead of being a separate module, the mainController is actually a controller within your existing app module. Therefore, injecting mainController as a dependency does not belong here. Make sure to remove the mainController injection from your modules dependencies array.

On the other hand, ngRoute and ngResources are modules that your module relies on - for example, $routeProvider comes from ngRoute module. To access $routeProvider, you must inject the ngRoute module as a dependency.

Answer 3

Answer №2

There is no need to include the controller as a dependency in the module definition

Instead of:

angular.module('app', ['ngRoute','ngResource','mainController'])

Use:

angular.module('app', ['ngRoute','ngResource'])

Check out the demo here

Answer 4

There is no need to include the controller as a dependency in the module definition

Instead of:

angular.module('app', ['ngRoute','ngResource','mainController'])

Use:

angular.module('app', ['ngRoute','ngResource'])

Check out the demo here

Answer 5

Answer №3

To begin with, avoid injecting the controller as a dependency. Keep in mind that you register it after creating the module and adding it to that model. Therefore, injecting it at the time of creating the module would not be logical since it does not exist yet. Does this make sense?

Here are some tips to simplify your life: separate your app configuration from your controller registrations. Create an app.js file, for instance, to organize the code. Note how I divided the steps and implemented a config function that is called in the app.config. This enhances readability considering the complexities of JavaScript.

(function() {
'use strict';

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

var config = function(routeProvider){
    routeProvider.when("/", {templateUrl: 'www/index.html', controller: 'mainController'});
};

app.config(['$routerProvider'], config); 
}) 
})();

Next, have a mainController.js file containing the controller code and its registration. This approach will better prepare you for future additions of controllers, services, etc. Additionally, instead of using $scope, utilize 'this' - beginning from version 1.5. The only exception is when you need to use $scope with angular charts. Just a heads up ;)

(function ()
{    
'use strict';

var mainController = function ($scope,)
{
    var vm = this;

    vm.variable = "value";
};

angular.module('app').controller('mainController', ['', mainController]);
})();

By the way, please excuse the odd indentation of the code snippets; the editor on this page seems to be causing some issues for me ;)

Answer 6

To begin with, avoid injecting the controller as a dependency. Keep in mind that you register it after creating the module and adding it to that model. Therefore, injecting it at the time of creating the module would not be logical since it does not exist yet. Does this make sense?

Here are some tips to simplify your life: separate your app configuration from your controller registrations. Create an app.js file, for instance, to organize the code. Note how I divided the steps and implemented a config function that is called in the app.config. This enhances readability considering the complexities of JavaScript.

(function() {
'use strict';

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

var config = function(routeProvider){
    routeProvider.when("/", {templateUrl: 'www/index.html', controller: 'mainController'});
};

app.config(['$routerProvider'], config); 
}) 
})();

Next, have a mainController.js file containing the controller code and its registration. This approach will better prepare you for future additions of controllers, services, etc. Additionally, instead of using $scope, utilize 'this' - beginning from version 1.5. The only exception is when you need to use $scope with angular charts. Just a heads up ;)

(function ()
{    
'use strict';

var mainController = function ($scope,)
{
    var vm = this;

    vm.variable = "value";
};

angular.module('app').controller('mainController', ['', mainController]);
})();

By the way, please excuse the odd indentation of the code snippets; the editor on this page seems to be causing some issues for me ;)

An error related to Angular module injection occurs while trying to execute my application

Answer №1

Answer №2

Answer №3

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