How can I retrieve the injector for my application? - angularjs

I'm trying to run a function and have services injected into it. I thought this could easily be accomplished using $injector. So I tried the following (simplified example):
angular.injector().invoke( [ "$q", function( $q ) { $q.something(); } ] );
Which results in Uncaught Error: [$injector:unpr] Unknown provider: $qProvider <- $q.
I know I can solve that by using angular.injector( ["ng"] ) instead, but there are actually several more dependencies.
It would be perfectly fine, if I could just retrieve the injector instance that is used everywhere else in my application.
The documentation for angular.injector suggests that you can retrieve it with angular.element(document).injector(), but that results in undefined for me.


You shouldn't be needing this, but you can get your app's $injector using the root-element of your app (or any child element).
E.g., if you use ngApp on the body:
angular.element(document.body).injector();


ExpertSystem's answer worked perfectly for me
This works perfectly for me. I'm trying to invoke a function from an angular service outside the angular scope in the document "resume" event for use in my cordova application. Here is the code that I used
var injector = angular.element(document.body).injector(); //get the document
injector.invoke(['myService', function (myService) {
myService.doSomething();
}]);


Try this:
var $injector = angular.injector(['myApp','ng'])
For $location you need to bootstrap the app to the page (start the app):
var $injector = angular.bootstrap(document, ['myApp'])
This will return the injector every time you call it but won't create any conflicts if the script was already loaded.

Related

$controller not getting instantiated in jasmine

This snippet of code is giving error when running my test case.
beforeEach(module(function($scope) {
// do something interesting with the service
//console.log($controller);
}));
Error coming up in console.
debug.js:21 Uncaught Error: [$injector:modulerr] Failed to instantiate
module function ($scope) due to:
Error: [$injector:unpr] Unknown provider: $scope
Could anyone please explain why it is not able to find $scope. It is also not working if I change it to $timeout or $controller.
Updated Code
If I change the code to this
Then it works
module(function($controllerProvider) {
// we could also access the $controllerProvider.allowGlobals() function,
// which allows us to register a controller on the window object.
$controllerProvider.register('ProductsController', function() {
// logic of the controller...
});
});

You're mixing up two different functions module and inject.
module configures the jasmine environment to use the angular module you specify. That's probably app. If you don't call this, the injector will not be able to find your services, controllers, directives, etc. In the module function, you can inject providers, not services, factories, etc. You use providers to configure how the services will behave later.
inject takes the function you supply and "injects" the services, constants, factories, etc by name before calling it. You use this to inejct the services etc themselves.
Here's a sample of how to split the calls in your code. I also changed the $scope to use $rootScope and create a scope.
beforeEach(function() {
module("app"); //or if your module is name something different, use that name instead
inject(function($controller, $rootScope) {
var $scope = $rootScope.$new();
var myCtrl = $controller("myCtrl", { $scope: $scope });
}));
});

AngularJS: unknown provider until after page loads?

So this is really weird, maybe it has a simple answer I'm missing. The following code gives an unknown provider error:
var foo = angular.module('foo', [ 'ngRoute', 'ngAnimate', 'ngCookies' ]);
foo.factory('fooApi', function ($scope, $http) {
var url = '/api/';
var factory = {};
factory.action = function (fields) {
fields.userid = $scope.userid;
fields.token = $scope.token;
console.log(JSON.stringify(fields));
return $http.post(url, { data: fields });
};
return factory;
})
.controller('loginController', function ($scope, fooApi) {
// do stuff
});
It's all loading together in the same file, and I'd think the factory being first would resolve and the injector would be able to find it when referenced below. But it gives an unknown provider error.
However, if I comment out the controller and wait for the page to load and then do the exact same controller declaration in the Chrome JS console it works fine.
Anyone run into this before and know how to deal with it? I haven't been able to find this same exact issue anywhere.

Like #tasseKATT said, you can not inject $scope into a service, particularly a factory. Maybe your confusion is because $scope can be injected in controllers, so you tried to injected into a factory.
An interesting thing is that the $scope that you see being injected into controllers is not a service - like the rest of the injectable stuff -, but is a Scope object.
The main purpose of $scope is a king of glue between views and controllers, it doesn't make much sense to pass a $scope into a service.
The services only have access to the $rootScope service.
If you need to pass the $scope of a specific controller to a service always you can pass it like parameter of a function in the service. This approach is not recommended because starting to break the SoC and the single responsibility principle, but maybe could fit you.
Good luck :-)

How to unit test a factory with Jasmine and Angular

I have searched the internet but was not able to find what I need. Basically I have a factory declared as follows:
angular.module('puFactories').factory('RestFactory', function ($http, $q) {
return {
getAccountInfo: getAccountInfo,
getFriendsInfos: getFriendsInfos
}
}
the 'puFactories' module has no dependencies. What I want is to create an instance of this factory in a jasmine unit test. I tried the following:
describe('Unit: RestFactory', function() {
var factory;
beforeEach(module('puFactories'));
beforeEach(inject(function(_RestFactory_){
factory = _RestFactory_;
}));
}
However I get the following exception when running karma:
Error: [$injector:unpr] Unknown provider: RestFactoryProvider <- RestFactory
EDIT:
Okay, so it seems that I need to clarify the code above. My module is properly declared and the application as a whole is working. I have simply splitted the factories and controllers in different files. The factory also returns and object in my application I have simplified the code as it is not relevant.
EDIT 2:
I also tried with
beforeEach(inject(function($injector){
factory = $injector.get('RestFactory');
}));
Simply the object being returned is undefined.

Okay so, after too much time spend on solving issue on this project I decided to start out with a clean one. I have included all the needed frameworks in this project. I have added it to a repo in github for easier use in future since it takes quite a while to configure all that. Here is the repo: https://github.com/fatalerrorbg/MobileAppBase

How can I register an angularjs factory after the app has "started" / been loaded?

I've got the guts of a routing architecture in Angular that will dynamically download and inject Angular Controllers and Services ... the Controller part works fine, and I'm trying to download dependant services via $route's .resolve property.
Now, say if I have a factory declared in scope while the page starts up, it registers fine and Controllers that use it resolve fine, e.g:
myModule.factory('MyInjectedDep', function() {
return {};
});
....
MyController = function(MyInjectedDep)
But if I try and register that dependency at "run time" (for want of a better phrase), I get a Circular Dependency error. e.g:
$route.routes[routeItem.route] = {
resolve: {
MyInjectedDep: ['$injector', function($injector) {
// In real code I download/eval this via $http but same behavior occurs
myModule.factory('MyInjectedDep', function() {
return {};
});
}]
}
}
So when my Controller is then initiated:
MyController = function(MyInjectedDep)
I get a circular dependency error, but no dependency trace in the error message?
Error: Circular dependency:
Any ideas appreciated

The key is latching onto $provide at configuration time. If you grab $provide at configuration time and maintain a reference to it, you can use it to register your factory like:
$provide.factory.apply(null, ['MyInjectedDep', [function() {
return {};
]}]);
I have a provider/service designed to do this, adapted from some other samples on github: https://github.com/afterglowtech/angular-couchPotato .
It's primarily designed to load from AMD, but you could probably use it's registerXXX functions with $http, or at least copy the relevant portions of its code. Don't let the size of the repository fool you -- the actual provider/service is about one page of code https://github.com/afterglowtech/angular-couchPotato/blob/master/src/couchPotato.js .

angular js unknown provider

I'm trying to "customize" the mongolab example to fit my own REST API. Now I'm running into this error and I am not sure what I am doing wrong:
Error: Unknown provider: ProductProvider <- Product
at Error (unknown source)
at http://localhost:3000/js/vendor/angular.min.js:28:395
at Object.c [as get] (http://localhost:3000/js/vendor/angular.min.js:26:180)
at http://localhost:3000/js/vendor/angular.min.js:28:476
at c (http://localhost:3000/js/vendor/angular.min.js:26:180)
at d (http://localhost:3000/js/vendor/angular.min.js:26:314)
This is my controller:
function ProductListCtrl($scope, Product) {
$scope.products = Product.query();
}
and this is the module:
angular.module('productServices', ['ngResource']).
factory('Product', ['$resource', function($resource){
var Product = $resource('/api/products/:id', { }, {
update: { method: 'PUT' }
});
return Product;
}]);

Your code looks good, in fact it works (apart from the calls themselves) when copied & pasted into a sample jsFiddle: http://jsfiddle.net/VGaWD/
Hard to say what is going on without seeing a more complete example but I hope that the above jsFiddle will be helpful. What I'm suspecting is that you are not initializing your app with the 'productServices' module. It would give the same error, we can see this in another jsFiddle: http://jsfiddle.net/a69nX/1/
If you are planning to work with AngularJS and MongoLab I would suggest using an existing adapter for the $resource and MongoLab: https://github.com/pkozlowski-opensource/angularjs-mongolab
It eases much of the pain working with MongoLab, you can see it in action here: http://jsfiddle.net/pkozlowski_opensource/DP4Rh/
Disclaimer! I'm maintaining this adapter (written based on AngularJS examples) so I'm obviously biased here.

I got that error because I was passing an incorrect parameter to the factory definition. I had:
myModule.factory('myService', function($scope, $http)...
It worked when I removed the $scope and changed the factory definition to:
myModule.factory('myService', function( $http)...
In case you need to inject $scope, use:
myModule.factory('myService', function($rootScope, $http)...

I just had a similar problem.
The error said the same the in the question, tried to solve it with the answer of pkozlowski.opensource and Ben G, which both are correct and good answers.
My problem was indeed different with the same error:
in my HTML-Code I had the initialisation like this...
<html ng-app>
A bit further down I tried to do something like this:
<div id="cartView" ng-app="myApp" ng-controller="CartCtrl">
I got rid of the first one... then it worked... obviously you can't initialise ng-app twice or more times. fair enough.
I totaly forgot about the first "ng-app" and got totaly frustrated. Maybe this is gonna help someone oneday...

Make sure your main app.js includes the services on which it depends. For example:
/* App Module */
angular.module('myApp', ['productServices']).
.....

pkozlowski's answer is correct, but just in case this happens to someone else, I had the same error after creating the same module twice by mistake; the second definition was overriding the provider of the first:
I created the module by doing
angular.module('MyService'...
).factory(...);
then a bit further down in the same file:
angular.module('MyService'...
).value('version','0.1');
The correct way of doing this is:
angular.module('MyService'...
).factory(...).value('version','0.1');

In my case, I've defined a new provider, say, xyz
angular.module('test')
.provider('xyz', function () {
....
});
When you were to config the above provider, you've to inject it with Provider string appended --> xyz becomes xyzProvider.
Ex:
angular.module('App', ['test'])
.config(function (xyzProvider) {
// do something with xyzProvider....
});
If you inject the above provider without the 'Provider' string, you'll get the similar error in OP.

At the end of the JS file to close the factory function I had
});
instead of
}());

This took me way too long to track down. Make sure you minisafe your controller within your directive.
.directive('my_directive', ['injected_item', function (injected_item){
return {
controller: ['DO_IT_HERE_TOO', function(DO_IT_HERE_TOO){
}]
}
}
Hope that helps

To add my own experience in here, I was trying to inject a service into one of my module config functions. This paragraph from the docs which I eventually found explains why that doesn't work:
During application bootstrap, before Angular goes off creating all services, it configures and instantiates all providers. We call this the configuration phase of the application life-cycle. During this phase, services aren't accessible because they haven't been created yet.
Meaning you can inject providers into module.config(...) functions, but you can't inject services, for that you need to wait until module.run(...), or expose a provider you can inject to module.config

For me, this error was caused by running the minified version of my angular app. Angular docs suggest a way to work around this. Here is the relevant quote describing the issue, and you can find the suggested solution in the docs themselves here:
A Note on Minification
Since Angular infers the controller's dependencies from the names of arguments to the controller's constructor function, if you were to minify the JavaScript code for PhoneListCtrl controller, all of its function arguments would be minified as well, and the dependency injector would not be able to identify services correctly.

Since this is the top result for "angularjs unknown provider" on Google right now, here's another gotcha. When doing unit testing with Jasmine, make sure you have this statement in your beforeEach() function:
module('moduleName');
Otherwise you'll get this same error in your tests.

Yet another case where this error will occur, if you're service is defined in a separate javascript file, make sure you reference it! Yes, I know, rookie mistake.

I was forgetting to inject the file that held my services altogether. Remember to do this when initializing your app module:
angular.module('myApp', ['myApp.services', ... ]);

In my case, I used an anonymous function as a wrapper for the angular module, like this:
(function () {
var app = angular.module('myModule', []);
...
})();
After closing the parenthesis, I forgot to call the anonymous function by opening and closing the parentheses again as above.

For me the problem was lazy loading; I loaded my controller and service late, so they were not available at page load (and Angular initialization). I did this with an ui-if tag, but that's irrelevant.
The solution was to load the service with the page load already.

Here's another possible scenario where you can see this error:
If you use Sublime Text 2 and the angular plugin, it will generate stubs like this
angular.module('utils', [])
.factory('utilFactory', [''
function() {
return {
}
}
]);
notice the empty ' ' as the first element of the array after the 'utilFactory' string. If you don't have any dependencies, remove that so it's like this:
angular.module('utils', [])
.factory('utilFactory', [
function() {
return {
}
}
]);

Since this question is top google result, I will add another possible thing to the list.
If the module that you're using has a failure on the dependency injection wrapper, it will provide this same result. For example copy & paste modules from the internet may rely on underscore.js and attempt to inject with '_' in the di wrapper. If underscore doesn't exist in your project dependency providers, when your controller attempts to reference your module's factory, it will get 'unknown provider' for your factory in the browser's console log.

The problem for me was that there were some new javascript files I created that referenced the service yet Chrome saw only the older version. A CTRL + F5 fixed it for me.

I got an "unknown provider" error related to angular-mocks (ngMockE2E) when compiling my project with Grunt. The problem was that angular-mocks cannot be minified so I had to remove it from the list of minified files.

After handling with this error too, I can support this list of answers with my own case.
It's at the same time simple and dumb (maybe not dumb for beginners like me, but yes for experts), the script reference to angular.min.js must be the first one in your list of scripts in the html page.
This works:
<script src="Scripts/angular.min.js"></script>
<script src="MyScripts/MyCartController.js"></script>
<script src="MyScripts/MyShoppingModule.js"></script>
This not:
<script src="MyScripts/MyCartController.js"></script>
<script src="MyScripts/MyShoppingModule.js"></script>
<script src="Scripts/angular.min.js"></script>
Notice about the angular.min.js.
Hope it helps anyone !! :)

My problem was with Yeoman, using (capitalized):
yo angular:factory Test
Made files (uncapitalized):
app/scripts/services/test.js
but the index.html file included (capitalized):
<script src="scripts/services/Test.js"></script>
Hope this helps someone.

Yet another possibility.
I had unknown Provider <- <- nameOfMyService. The error was caused by the following syntax:
module.factory(['', function() { ... }]);
Angular was looking for the '' dependency.

My scenario may be a little obscure but it can cause the same error and someone may experience it, so:
When using the $controller service to instantiate a new controller (which was expecting '$scope' as it's first injected argument) I was passing the new controller's local scope into the $controller() function's second parameter. This lead to Angular trying to invoke a $scope service which doesn't exist (though, for a while, I actually thought that I'd some how deleted the '$scope' service from Angular's cache). The solution is to wrap the local scope in a locals object:
// Bad:
$controller('myController', newScope);
// Good:
$controller('myController, {$scope: newScope});

None of the answers above worked for me, maybe I was doing completely wrong, but as a beginner that's what we do.
I was initializing the controller in a div in order to have a list:
<div ng-controller="CategoryController" ng-init="initialize()">
And then using $routeProvider to map a URL to the same controller. As soon as I removed the ng-init the controller worked with the route.

I had same problem. I fixed that using $('body').attr("ng-app", 'MyApp') instead of <body ng-app="MyApp"> to boostrap.
Because I did
angular.element(document).ready(function () {
angular.bootstrap(document, [App.Config.Settings.AppName]);
})
for architecture requirements.

In my Ruby on Rails app, I had done the following:
rake assets:precompile
This was done in the 'development' environment, which had minified Angular.js and included it in the /public/assets/application.js file.
Removing the /public/assets/* files solved the problem for me.

I faced similar issue today and issues was really very small
app.directive('removeFriend', function($scope) {
return {
restrict: 'E',
templateUrl: 'removeFriend.html',
controller: function($scope) {
$scope.removing = false;
$scope.startRemove = function() {
$scope.removing = true;
}
$scope.cancelRemove = function() {
$scope.removing = false;
}
$scope.removeFriend = function(friend) {
var idx = $scope.user.friends.indexOf(friend)
if (idx > -1) {
$scope.user.friends.splice(idx, 1);
}
}
}
}
});
If you observe the above block, in the first line you will observe I injected $scope by mistake which is incorrect. I removed that unwanted dependency to solve the issue.
app.directive('removeFriend', function() {
return {
restrict: 'E',
templateUrl: 'removeFriend.html',
controller: function($scope) {
$scope.removing = false;
$scope.startRemove = function() {
$scope.removing = true;
}
$scope.cancelRemove = function() {
$scope.removing = false;
}
$scope.removeFriend = function(friend) {
var idx = $scope.user.friends.indexOf(friend)
if (idx > -1) {
$scope.user.friends.splice(idx, 1);
}
}
}
}
});

I had this error after I created a new factory and used it within a component but I did not check the specs of that components
so if the failure in your (specs) test files
you need to add beforeEach(module('YouNewServiceModule'));

Another 'gotcha': I was getting this error injecting $timeout, and it took a few minutes to realize I had whitespace in the array values. This will not work:
angular.module('myapp',[].
controller('myCtrl', ['$scope', '$timeout ',
function ($scope, $timeout){
//controller logic
}
]);
Posting just in case some else has a silly error like this.

My case was dodgy typing
myApp.factory('Notify',funtion(){
function has a 'c' !

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