Error in AngularJS: $injector:unpr Provider Not Found

I am currently in the process of creating my own service using the factory methodology as outlined in the documentation. However, I seem to be encountering an issue with an unknown provider error. Below is the code for my app which includes the declaration, configuration, and factory definition.

UPDATE: I have included all relevant files for easier troubleshooting

UPDATE: The specific error details indicate that the problem lies with getSettings, as it is searching for getSettingsProvider but cannot find it

Error: [$injector:unpr] http://errors.angularjs.org/1.2.16/$injector/unpr?    p0=getSettingsProvider%20%3C-%20getSettings
    at Error (native)
    at http://localhost/sw/selfservice/bower_components/angular/angular.min.js:6:450
    at http://localhost/sw/selfservice/bower_components/angular/angular.min.js:35:431
    at Object.c [as get] (http://localhost/sw/selfservice/bower_components/angular/angular.min.js:34:13)
    at http://localhost/sw/selfservice/bower_components/angular/angular.min.js:35:499
    at c (http://localhost/sw/selfservice/bower_components/angular/angular.min.js:34:13)
    at d (http://localhost/sw/selfservice/bower_components/angular/angular.min.js:34:230)
    at Object.instantiate (http://localhost/sw/selfservice/bower_components/angular/angular.min.js:34:394)
    at http://localhost/sw/selfservice/bower_components/angular/angular.min.js:66:112
    at http://localhost/sw/selfservice/bower_components/angular/angular.min.js:53:14 angular.js:9778
(anonymous function) angular.js:9778
(anonymous function) angular.js:7216
h.$apply angular.js:12512
(anonymous function) angular.js:1382
d angular.js:3869
$b.c angular.js:1380
$b angular.js:1394
Wc angular.js:1307
(anonymous function) angular.js:21459
a angular.js:2509
(anonymous function) angular.js:2780
q angular.js:330
c



Here are the various files currently used in my application:

app.JS

//Initializing angular module including route dependencies

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

app.config(function ($routeProvider) {
   $routeProvider
       .when('/', {
           templateUrl:"partials/login.html",
           controller:"login"
       });
});






app.factory('getSettings', ['$http', '$q', function($http, $q) {
    return function (type) {
        var q = $q.defer();
        $http.get('models/settings.json').success(function (data) {
            q.resolve(function() {
                var settings = jQuery.parseJSON(data);
                return settings[type];
            });
        });

        return q.promise;
    };
}]);

And here is how I am implementing this service in my controller

controller.JS

app.controller("globalControl", ['$scope','getSettings', function ($scope,getSettings) {
    var loadSettings = getSettings('global');
    loadSettings.then(function(val) {
        $scope.settings = val;
    });

}]);


app.controller("login", ['$scope', function ($scope) {

    return ""



}]);

directives.js

app.directive('watchResize', function(){
    return {
        restrict: 'M',
        link: function(scope, elem, attr) {
            scope.spacer = (window.innerWidth < 1025) ? '' : 'large-3';
            scope.button = (window.innerWidth < 1025) ? '' : 'large-6';
            angular.element(window).on('resize', function(){
                scope.$apply(function(){
                    scope.spacer = (window.innerWidth < 1025) ? '' : 'large-3';
                    scope.button = (window.innerWidth < 1025) ? '' : 'large-6';
                });
            });
        }
    };
});

If relevant, here is the HTML structure

<html class="no-js" lang="en" ng-app="selfservice" ng-controller="globalControl">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>{{settings.title}}</title>
     <link rel="stylesheet" href="css/app.css" />
    <script src="bower_components/modernizr/modernizr.js"></script>
      <script src="bower_components/angular/angular.min.js"></script>
       <script src="bower_components/angular-route/angular-route.min.js"></script>
       <script src="bower_components/jquery/dist/jquery.min.js"></script>
      <script src="js/app.js"></script>
      <script src="js/controllers.js"></script>
      <script src="js/directives.js"></script>
  </head>
  <body>
    <div id="template">
        <header id="header">
            <img src="{{settings.logo}}" alt="{{settings.logoDescription}}"/>
        </header>

        <div id="view">
            <ng-view></ng-view>
        </div>

    </div>

    <script src="bower_components/foundation/js/foundation.min.js"></script>
        <script>
        //initialize foundation
        $(document).foundation();

    </script>
  </body>
</html>

Any guidance on resolving this issue would be greatly appreciated. I have made an effort to follow the documentation accurately, although some of the related problems discussed on Stack Overflow are quite complex and challenging for me to comprehend. This is my first attempt at creating a service.

javascriptangularjsangularjs-service

Answer №1

Perhaps one of the common reasons is forgetting to add the service file to your page

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

Answer №2

It is important to ensure that your angular module is initialized correctly. The global object app must be defined and initialized properly in order to inject the service.

Here is an example of how you can set up your code:

app.js

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

app.config(['$routeProvider', '$locationProvider', function($routeProvider, $locationProvider) {
  $routeProvider
    .when('/', {
      templateUrl:"partials/login.html",
      controller:"login"
    });

  $locationProvider
    .html5Mode(true);
}]);

app.factory('getSettings', ['$http', '$q', function($http, $q) {
  return {
    getSetting: function (type) { 
      var q = $q.defer();
      $http.get('models/settings.json').success(function (data) {
        q.resolve(function() {
          var settings = jQuery.parseJSON(data);
          return settings[type];
        });
      });
      return q.promise;
    }
  }
}]);

app.controller("globalControl", ['$scope','getSettings', function ($scope,getSettings) {
  var loadSettings = getSettings.getSetting('global');
  loadSettings.then(function(val) {
    $scope.settings = val;
  });
}]);

Your HTML code should look like this:

<!DOCTYPE html>
<html>
    <head lang="en">
        <title>Sample Application</title>
    </head>
    <body ng-app="SampleApp" ng-controller="globalControl">
        <div>
            Your UI elements go here
        </div>
        <script src="app.js"></script>
    </body>
</html>

Remember to bind the controller to the body tag, not an HTML element, and include custom scripts at the end of the HTML page for better performance.

This should help resolve any basic injection issues you may be facing.

Answer №3

app.service('fetchSettings', ['$http','$q' /*important!!!*/,function($http, $q) {

It is important to include all dependencies in the declaration or none at all. Please don't forget to include $q.

Edit:

In controller.js: make sure that the login function does not return an empty string.

Answer №4

Another common cause of this error is mistakenly injecting $scope into a factory:

angular.module('app', [])
    .factory('utilities', function ($scope) { // <-- using '$scope' here results in 'Unknown provider'
       // ...
    });

Answer №5

After spending several hours tackling the same issue, I successfully resolved it using the following steps:

In my app.js file:

var myApp = angular.module( 'myApp', ['ngRoute', 'ngResource', 'CustomServices'] );

I created a new module called CustomServices and saved it in a separate file named services.js.

Within _Layout.cshtml:

<script src="~/Scripts/app.js"></script>
<script src="~/Scripts/services/services.js"></script>

services.js contents:

var app = angular.module('CustomServices', []); 
app.factory( 'GetPeopleList', ['$http', '$log','$q', function ( $http, $log, $q )
{
    //Your implementation here
}

Also in app.js:

myApp.controller( 'mainController', ['$scope', '$http', '$route', '$routeParams', '$location', 'GetPeopleList', function ( $scope, $http, $route, $routeParams, $location, GetPeopleList )

To make it work, remember to bind your service to your new module in services.js file, use that new module during the creation of your main app module (app.js), and declare the usage of the service within the controller where you intend to utilize it.

Answer №6

I encountered an issue where I mistakenly included my controller both in ui.router and the html template like so:

.config(['$stateProvider',
  function($stateProvider) {
    $stateProvider.state('dashboard', {
      url: '/dashboard',
      templateUrl: 'dashboard/views/index.html',
      controller: 'DashboardController'
    });
  }
]);

and 

<section data-ng-controller="DashboardController">

Answer №7

Ensure to "incorporate" both the Controller and the corresponding module(s) in which the controller and its related functions are invoked from.

module(theModule);

Answer №8

@ user2310334 I recently attempted a very simple example:

HTML file

<!DOCTYPE html>
<html lang="en" ng-app="app">

<head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.6/angular.min.js" type="text/javascript"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.6/angular-route.min.js" type="text/javascript"></script>
    <script src="./app.js" type="text/javascript"></script>
</head>

<body>
    <div ng-controller="MailDetailCtrl">
    </div>
</body>
</html>

The javascript file:

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

myApp.factory('mailService' , function () {
return {
    getData : function(){
      var employees = [{name: 'John Doe', id: '1'},
        {name: 'Mary Homes', id: '2'},
        {name: 'Chris Karl', id: '3'}
      ];

      return employees;
    }
  };

});


myApp.controller('MailDetailCtrl',['$scope', 'mailService', function($scope, mailService) {
  alert(mailService.getData()[0].name);
}]);

And it actually works. Give it a try.

Answer №9

Make sure that the controller is loaded outsideapp.config. Using the following code could result in an error:

app.config(["$stateProvider", "$urlRouterProvider", function ($stateProvider, $urlRouterProvider) {
       var AuthCtrl = require('components/auth/AuthCtrl'); //NOTICE HERE
       $stateProvider.state('login',{
            url: "/users/login",
            templateUrl: require("components/auth/login.tpl.html"),
            controller: AuthCtrl // ERROR
        })
}))

To resolve this issue, move AuthCtrl to be defined outsideapp.config:

var AuthCtrl = require('components/auth/AuthCtrl'); //NOTICE HERE
app.config(["$stateProvider", "$urlRouterProvider", function ($stateProvider, $urlRouterProvider) {
       $stateProvider.state('login',{
            url: "/users/login",
            templateUrl: require("components/auth/login.tpl.html"),
            controller: AuthCtrl // WORK
        });
}))

Answer №10

In my unique situation, I introduced a fresh service (file) to enhance the functionality of my application. This new feature is seamlessly integrated into an existing controller without overlooking the crucial step of injecting the new service dependency. Ensuring that my app module was declared in only one location, I encountered a recurring exception upon re-launching my web app. The issue persisted when my browser cache failed to reset with the updated code from the new service file. A simple browser refresh facilitated the retrieval of the latest code, resolving the problem swiftly.

Answer №11

When searching for the error message 

Error: $injector:unpr Unknown Provider
, this is the first Stackoverflow question that comes up on Google. I wanted to share a solution here.

It's important to ensure that in your index.html file, modules and dependencies are loaded in the correct order to avoid errors.

For instance, in my code, the customFactory.factory.js file starts like this:

angular
   .module("app.module1")
   .factory("customFactory", customFactory);

However, the order of script loading in the index.html was incorrect:

    <script src="/src/client/app/customFactory.factory.js"></script>
    <script src="/src/client/app/module1.module.js"></script>

The correct order should have been:

    <script src="/src/client/app/module1.module.js"></script>
    <script src="/src/client/app/customFactory.factory.js"></script>

Since customFactory.factory.js is part of the module1 module, it must be loaded before customFactory.

Answer №12

While working on a Jasmine unit test, I encountered an error. The line causing the issue was:

angular.injector(['myModule'])

The corrected version should include both 'ng' and 'myModule', like this:

angular.injector(['ng', 'myModule'])

Answer №13

It is important to avoid using ng-controller in ui-router as controllers are automatically instantiated for a ui-view when the corresponding states are activated.

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