What is the correct way to inject a service into a controller in Angular?
I have written a service and i’d like to use it in my controllers. But i keep getting an error. Maybe it would be easy for someone to spot my mistake…
authController.js
(function() {
'use strict';
angular
.module('authApp')
.service('authService', function($auth, $state, $http, $rootScope, envService, $scope) {
// some code
})
.controller('SignupController', SignupController, ['$scope', 'authService’]);
function SignupController($http, $scope, $rootScope, $location, envService, authService) {
// want to use my authService here
}
...
At this point I get the following error :
angular.js:12477 Error: [$injector:unpr] Unknown provider: $scopeProvider <- $scope <- authService
What is wrong with the way I have injected authService into my signupController??
Thanks.
You have an error declaring your controller. Declaring a controller with the array syntax receives the name of the controller as a String as first parameter, and an array as a second parameter. The last element of the array must be the a function with all the controller logic. That function must have as many parameters as previous elements in the array itself. In your case it should be something like:
(function() {
'use strict';
angular
.module('authApp')
.service('authService', function($auth, $state, $http, $rootScope, envService, $scope) {
// some code
})
.controller('SignupController', ['$http', '$scope', '$rootScope', '$location', 'envService', 'authService', function ($http, $scope, $rootScope, $location, envService, authService) {
// Use your authService here
}]);
...
You can check the styleguide to write your controllers, services and inject your dependencies in a better way.
Related
My service:
angular.module('app').factory('keretHttpSrv', function ($http, $state, $scope, $rootScope, $q, $localStorage) {
/*some code*/
return keretHttpService;
})
My controller,
angular.module('app.dashboard')
.controller('DashboardCtrl',
['$scope', 'keretHttpSrv', function ($scope, keretHttpSrv)
{
/*some code*/
}])
I have this error:
Error: $injector:unknown provider
How can I solve this problem?
there is no $scope for a factory
FIX
angular.module('app').factory('keretHttpSrv', function ($http, $state, $rootScope, $q, $localStorage) {
/*some code*/
return keretHttpService;
})
You are adding the 'keretHttpSrv' factory to the 'app' module and adding the 'DashboardCtrl' controller to the 'app.dashboard' module. To access the factory you will have to either inject the 'app' module into 'app.dashboard' when you define it
angular.module('app.dashboard', ['app']);
or put both the factory and the controller in the same module
//first define the module
angular.module('app', []);
angular.module('app').factory('keretHttpSrv', function ($http, $state, $scope, $rootScope, $q, $localStorage) {
/*some code*/
return keretHttpService;
})
angular.module('app')
.controller('DashboardCtrl',
['$scope', 'keretHttpSrv', function ($scope, keretHttpSrv)
{
/*some code*/
}])
do you need to use routing here
you have two option :
angular.module("app",['ngRoute']);
it is lib in angular but the second option is better
2.angular.module("app",['ui.router']);
after you need to config the provider of $state in
angular.module("app",['ui.router']).config(function($stateProvider,...){};
all about ui router u can read here UI ROUTER
and see example here Examples
I have the module of my application:
angular.module('app', ['app.controllers','app.routes','app.services']);
I have my services module:
angular.app('app.services', [])
.factory('usuarioService', ['$rootScope', 'renderService',
function($rootScope, renderService){
// logic of factory
}]);
angular.module('app.services', [])
.factory('renderService', ['$http',
function($http){
// logic of factory
}]);
and I have my controller:
angular.module('app.controllers', ['app.services'])
.controller('meuCtrl',
['$scope','$rootScope','usuarioService','renderservice',
function($scope, $rootScope, usuarioService, renderService){
// logic of controller
}]);
But to run the application, I get dependencies injection error:
Unknown provider: usuarioServiceProvider <- usuarioService <- meuCtrl
I do not understand what might be going on, as do the injection into appropriate location.
unless I'm doing wrong these injections.
PS .: All .JS files are being loaded into index.html, none have been forgotten.
Your usuarioService factory declaration is incorrectly adding itself to a non-existent member of the angular object.
You have:
angular.app('app.services', []) // note the 'app' usage
.factory('usuarioService', ['$rootScope', 'renderService',
You should have
angular.module('app.services', []) // note the 'module' usage
.factory('usuarioService', ['$rootScope', 'renderService',
Try this
angular.module('app.services')
.factory('renderService', ['$http', function($http) {
//logic
return renderService;
}]);
angular.module('app.services')
.factory('usuarioService', ['$rootScope', 'renderService',function($rootScope,renderService) {
//logic
return renderService;
}]);
angular.module('app.controllers', ['app.services'])
.controller('meuCtrl',
['$scope','$rootScope','usuarioService','renderservice',
function($scope, $rootScope, usuarioService, renderService){
// logic of controller
}]);
everyone.
I have a really strange (for me) problem here. I am trying to inject the $q lib in one of my controllers and when I try to console.log() it, it returns "undefined". I am injecting the same library in one of my services, and it's working there! Let me show you:
The service:
(function() { 'use strict';
angular
.module('app.grid')
.factory('GridData', GridData);
GridData.$inject = ['$http', '$q'];
function GridData($http, $q) {
...
The controller (not working):
(function() {
'use strict';
angular
.module('app.grid')
.controller('GridCtrl', GridCtrl);
GridCtrl.$inject = ['$log', '$scope', 'GridData', '$q'];
function GridCtrl($log, $scope, GridData, $rootScope, $q) {
console.log($q); // Returns "undefined"
...
I wonder if any of you guys had had this same problem before? It's probably something real stupid, like it always is, but I can't see it for some reason :(
Cheers,
H
You need to add the $rootScope to your $inject array:
GridCtrl.$inject = ['$log', '$scope', 'GridData', '$rootScope', '$q'];
Or remove it from the argument list if it's not needed:
function GridCtrl($log, $scope, GridData, $q) {
You have one too many arguments:
GridCtrl.$inject = ['$log', '$scope', 'GridData', '$q'];
function GridCtrl($log, $scope, GridData, $rootScope, $q) {
// ^
}
You're not injecting $rootScope. The $q service will be available inside your controller, it will just be referred to by $rootScope instead of $q. Remove that and it should work! Alternatively, add '$rootScope to the dependency array.
I have multiple controllers in multiple files.
on one page I use two controllers.
Now I get the error '&p1=not%20a%20function%2C%20got%20undefined'
app.js:
var app = angular.module('demo', ['MainControllers', 'MainServices'])
.constant('myConfig', {
'backend': 'http://localhost:7645',
});
controller 1:
angular.module('MainControllers', ['ui.bootstrap'])
.controller('DemoOneController', function($scope, $rootScope, $modal, mainService) {
Controller 2:
angular.module('MainControllers', ['ui.bootstrap'])
.controller('DemoTwoController', function($scope, $rootScope, $modal, mainService) {
controller 3:
angular.module('MainControllers', ['ui.bootstrap'])
.controller('ModalDemoCtrl', function ($scope, $modal, $log) {
what is wrong?
when u use angular.module('MainControllers', ['ui.bootstrap']) will override the previous module you define with MainControllers name. you need only one definition of the module so u can do like this,
angular.module('MainControllers', ['ui.bootstrap'])
.controller('DemoOneController', function($scope, $rootScope, $modal, mainService) {
angular.module('MainControllers')
.controller('DemoTwoController', function($scope, $rootScope, $modal, mainService) {
angular.module('MainControllers')
.controller('ModalDemoCtrl', function ($scope, $modal, $log) {
removing , ['ui.bootstrap'] from second and third controllers will solve the overriding issue,
when angular finds module dependency array with or without empty like
angular.module('MainControllers', []) //without dependency
angular.module('MainControllers', ['ui.bootstrap']) //with dependency
it will override the module.
if you do like angular.module('MainControllers').controller('Mo....` //without dependency array
it will check for the module with the name MainControllers which is already defined and assign the controller to that module.
here is the demo Plunker
I have a service called authService. I call it from the Logincontroller as follows :
angular.module('myApp').controller('LoginController',function($q, $scope, $location,$routeParams, $window, authService) {//some code here});
this works fine.
Now I have another service called regService which is like :
angular.module('myApp').factory('regService ', function ($window, $q, $rootScope) {//some code here});
Now in LoginController how do I call functions from regService ?
Both existing answers are technically correct, but if you decide to minify/uglify your code anytime in the future, those solutions will eventually break.
To prevent this, John Papas AngularJS style guide favors the use of the $inject service in Y091 like so :
angular.module('myApp').controller('LoginController', LoginCtrl);
LoginCtrl.$inject = ['$q', '$scope', '$location', '$routeParams', '$window', 'authService', 'regService'];
function LoginCtrl($q, $scope, $location, $routeParams, $window, authService, regService) {
//some code here
}
Just do it like authService, you just need to add regService. AngularJS will automatically bind the service based on name. You might want to understand more about Dependency Injection - https://docs.angularjs.org/guide/di
angular.module('myApp').controller('LoginController',function($q, $scope, $location,$routeParams, $window, authService, regService) {//some code here});
Just do:
angular.module('myApp')
.controller('LoginController', function($q, $scope, $location, $routeParams, $window, authService, regService) {
});