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AngularJS Error: $injector:unpr Unknown Provider

由 半世苍凉 提交于 2019-11-28 17:44:19
Kunal Shewale

Your angular module needs to be initialized properly. The global object app needs to be defined and initialized correctly to inject the service.

Please see below sample code for reference:

app.js

var app = angular.module('SampleApp',['ngRoute']); //You can inject the dependencies within the square bracket    

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 {
    //Code edited to create a function as when you require service it returns object by default so you can't return function directly. That's what understand...
    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) {
  //Modified the function call for updated service
  var loadSettings = getSettings.getSetting('global');
  loadSettings.then(function(val) {
    $scope.settings = val;
  });
}]);

Sample HTML code should be 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>

Please note that the controller is not binding to an HTML tag but to the body tag. Also, please try to include your custom scripts at end of the HTML page as this is a standard practice to follow for performance reasons.

I hope this will solve your basic injection issue.

also one of the popular reasons maybe you miss to include the service file in your page 

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

app.factory('getSettings', ['$http','$q' /*here!!!*/,function($http, $q) {

you need to declare ALL your dependencies OR none and you forgot to declare $q .

edit:

controller.js : login, dont return ""

This error is also appears when one accidntally injects $scope into theirs factory:

angular.module('m', [])
    .factory('util', function ($scope) { // <-- this '$scope' gives 'Unknown provider' when one attempts to inject 'util'
       // ...
    });

Spent a few hours trying to solve the same. This is how I did it:

app.js:

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

CustomServices is a new module I created and placed in a separate file called services.js

_Layout.cshtml:

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

services.js:

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

app.js

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

You have to bind your service to your new module in the services.js file AND of course you have to use that new module in the creation of your main app module (app.js) AND also declare the use of the service in the controller you want to use it in.

I was getting this problem and it turned out I had included my controller both in ui.router and in the html template as in 

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

and 

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

Please "include" both Controller and the module(s) where the controller and the functions called in the Controller are.

module(theModule);

@ user2310334 I just tried this, a VERY basic 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 works. Try it.

Be sure that you load controller outsideapp.config. The following code may cause this 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 fix this error, we must move AuthCtrl to 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
        });
}))

In my case, I added a new service (file) to my app. That new service is injected in an existing controller. I did not miss new service dependency injection into that existing controller and did not declare my app module no more than one place. The same exception is thrown when I re-run my web app and my browser cache is not reset with a new service file codes. I simply refreshed my browser to get that new service file for browser cache, and the problem was gone.

Since this is the first Stackoverflow question that appears on Google when searching for Error: $injector:unpr Unknown Provider I'll add this here.

Make sure that in your index.html any modules/dependencies are not being loaded after they are needed.

For example in my code customFactory.factory.js begins like this:

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

However the index.html looked like this:

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

Where it should've really looked like this:

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

Since customFactory.factory.js is declared as part of module1, it needs to be loaded before customFactory

When you are using ui-router, you should not use ng-controller anywhere. Your controllers are automatically instantiated for a ui-view when their appropriate states are activated.

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javascript
angularjs
angularjs-service
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