I have made a little library of code for angular js. I have created a .config method in my library's main module that depends on my moduleConfigProvider. I expect the consumer of my library to call .configure on my config provider during the app.config stage (asap on app start).
The problem is that my .config in my module seems to run BEFORE the app.config of the main app module. How can I work around this problem?
e.g. This is how i'm consuming the config. I need to consume it during the .config stage because I need to configure things like $httpProvider.
// this module provides initial configuration data for module
angular.module('mymodule')
.config(['$httpProvider', 'someOptionsProvider', 'myConfigProvider',
function ($httpProvider, someOptionsProvider, myConfigProvider) {
console.log("Consuming config now: ", myConfigProvider.config);
}])
Here is the config provider:
angular.module('mymodule.config')
.provider('myConfig', function() {
var _this = this;
_this.configure = configureMethod;
_this.config = {};
function configureMethod(configData) {
_this.config = configData;
console.log("Config set to:", configData);
};
this.$get = function() {
return _this;
};
});
And finally here is my app.config:
angular.module('app')
.config(['myConfigProvider', function(myConfigProvider) {
console.log("Running App config:", myConfigProvider);
var config = { a: 1 };
console.log("Config ready to send:", config);
myConfigProvider.configure(config);
}])
;
Okay, it is simple, just use other providers in your provider function as dependencies.
Check the following snippet
angular.module('mymodule', [])
.provider('myConfig', [
'$httpProvider',
function($httpProvider) {
var _this = this;
_this.configure = configureMethod;
_this.config = {};
function configureMethod(configData) {
//Do here anything with the $httpProvider
_this.config = configData;
console.log("Config set to:", configData);
console.log('Configuring $httpProvider')
};
this.$get = function() {
return _this;
};
}
])
angular.module('app', ['mymodule'])
.config(['myConfigProvider', function(myConfigProvider) {
console.log("Running App config:");
var config = {
a: 1
};
console.log("Config ready to send:", config);
myConfigProvider.configure(config);
}]);
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="app">
</div>
I have created and injected the service(myService) into my app (app) , but it is not working. The error implies that I have not defined the service anywhere:
Error: [$injector:unpr] Unknown provider: myServiceProvider <- myService <- myController
myService calls another service - ajaxService to do the actual http call.
The only reason I would think that myService throws the above error when trying to call it in myController is because I have another module defined in the app definition (common.components). This module has its own separate services which I am using elsewhere in my app. I am wondering if the app is searching for a definition of myService within that the common.components module instead of inside itself.
Here is my code:
- app.js
var app = angular.module('app ', ['ngRoute','common.components']);
- myService.js
var serviceId = 'myService';
angular.module('app').service(serviceId,['$q','ajaxService','$log',myService]);
function myService($q, ajaxService, $log){
var states = [];
this.getStates = function() {
var defered = $q.defer();
ajaxService.getStates().then(function(result){
states = result.data;
defered.resolve(states);
},
function(error){
deferred.reject();
});
return defered.promise;
};
}
- ajaxService.js
var serviceId = 'ajaxService';
angular.module('app',[]).service(serviceId,['$http','$log',ajaxService]);
function ajaxService($http,$log){
this.getStates = function() {
return $http.get('./json/DATA.json');
};
}
myController.js
(function(){
'use strict';
angular.module('app').controller('myController',['$scope','$log','myService',myController]);
function myController($scope,$log,myService){
$scope.states = [];
myService.getStates().then(function(states){
$scope.states = states;
});
}
})();
I have been trying to find out what is wrong for hours, but I am lost. Can someone help me with this?
I have updated my answer as you have now provided more info.
Your issue is in your ajaxService.js
Change this line
angular.module('app',[]).service(serviceId,['$http','$log',ajaxService]);
to this
angular.module('app').service(serviceId,['$http','$log',ajaxService]);
Your are recreating the app module by adding the [].
I am trying to inject the $window object into the config method in AngularJS, but I keep getting an error...
What is the correct way to do this?
Here is my code :
angular.module('myApp', ['$window']) //is this wrong?
.config(function ($window) { //this is not the way?
console.log($window); //console.log fails //error
})
.controller("main", function($scope) {
$scope.index = 0;
$scope.num = number[$scope.index];
$scope.increase = function () {
$scope.index += 1;
$scope.num = number[$scope.index];
}
})
Live Demo
you can't inject $window service to the config as services are not initialized at config time yet. however, you can inject them providers and get an instance. in your case:
angular.module('myApp', [])
.config(function ($windowProvider) {
var $window = $windowProvider.$get();
console.log($window);
})
Only constants and providers can be injected in config block. $window is a service. & it might not be available or configured while execution of config block so angular prevents it from using it.
You can use run block. This acts as a main method for your angular app. This is executed just right before application is instantiated. By the time run block is executed all the service will be finished configuring and are ready to be injected. So you can use $window as below,
angular.module('myApp', ['$window'])
.run(function ($window) { //use run rather than config
console.log($window);
})
.controller("main", function($scope) {
$scope.index = 0;
$scope.num = number[$scope.index];
$scope.increase = function () {
$scope.index += 1;
$scope.num = number[$scope.index];
}
})
I have a simple question about the dependency injection in Angular. I create custom services in order to use them within each other. Unfortunately I receive errors the way I was trying it. This is my Code:
var myApp = angular.module('app', []);
myApp.service('$service1', ['$rootScope', function($rootScope) {
this.test = function() {
console.log('service1');
};
}]);
myApp.provider('$service2', ['$service1', function($service1) {
var service = 'service2';
this.registerService = function(mytext) {
service = mytext;
};
this.$get = function() {
var that = {};
that.test = function() {
console.log(service);
};
return that;
};
}]);
myApp.config(['$service2Provider', function($service2Provider) {
$service2Provider.registerService('changed service2');
}]);
myApp.controller('AppCtrl', ['$rootScope', '$service1', '$service2',
function($rootScope, $service1, $service2) {
$service1.test();
$service2.test();
}]);
Error: [$injector:modulerr] Failed to instantiate module app due to:
[$injector:unpr] Unknown provider: $service1
http://errors.angularjs.org/1.2.0-rc.2/$injector/unpr?p0=%24service1
If you remove the dependency of $servic1 in $service2 it will work, but why?
The code is mostly right, except you have to inject service dependencies in $get, not in the provider constructor function, like this:
myApp.provider('$service2', function() {
var service = 'service2';
this.registerService = function(mytext) {
service = mytext;
};
this.$get = ['$service1', function($service1) {
var that = {};
that.test = function() {
console.log(service);
};
return that;
}];
});
It appears that provider can not inject such a dependency. If you rewrite $service2 using a factory, it works:
myApp.factory('$service2', ['$service1', function($service1) {
var that = {};
that.test = function() {
$service1.test();
console.log('service2');
};
return that;
}]);
See this plunker: http://plnkr.co/edit/JXViJq?p=preview
Also I believe that service names starting with a $ a reserved for AngularJS and its extensions. Use names without the $ at the beginning for services defined by your application.
I want to inject a service into app.config, so that data can be retrieved before the controller is called. I tried it like this:
Service:
app.service('dbService', function() {
return {
getData: function($q, $http) {
var defer = $q.defer();
$http.get('db.php/score/getData').success(function(data) {
defer.resolve(data);
});
return defer.promise;
}
};
});
Config:
app.config(function ($routeProvider, dbService) {
$routeProvider
.when('/',
{
templateUrl: "partials/editor.html",
controller: "AppCtrl",
resolve: {
data: dbService.getData(),
}
})
});
But I get this error:
Error: Unknown provider: dbService from EditorApp
How to correct setup and inject this service?
Set up your service as a custom AngularJS Provider
Despite what the Accepted answer says, you actually CAN do what you were intending to do, but you need to set it up as a configurable provider, so that it's available as a service during the configuration phase.. First, change your Service to a provider as shown below. The key difference here is that after setting the value of defer, you set the defer.promise property to the promise object returned by $http.get:
Provider Service: (provider: service recipe)
app.provider('dbService', function dbServiceProvider() {
//the provider recipe for services require you specify a $get function
this.$get= ['dbhost',function dbServiceFactory(dbhost){
// return the factory as a provider
// that is available during the configuration phase
return new DbService(dbhost);
}]
});
function DbService(dbhost){
var status;
this.setUrl = function(url){
dbhost = url;
}
this.getData = function($http) {
return $http.get(dbhost+'db.php/score/getData')
.success(function(data){
// handle any special stuff here, I would suggest the following:
status = 'ok';
status.data = data;
})
.error(function(message){
status = 'error';
status.message = message;
})
.then(function(){
// now we return an object with data or information about error
// for special handling inside your application configuration
return status;
})
}
}
Now, you have a configurable custom Provider, you just need to inject it. Key difference here being the missing "Provider on your injectable".
config:
app.config(function ($routeProvider) {
$routeProvider
.when('/', {
templateUrl: "partials/editor.html",
controller: "AppCtrl",
resolve: {
dbData: function(DbService, $http) {
/*
*dbServiceProvider returns a dbService instance to your app whenever
* needed, and this instance is setup internally with a promise,
* so you don't need to worry about $q and all that
*/
return DbService('http://dbhost.com').getData();
}
}
})
});
use resolved data in your appCtrl
app.controller('appCtrl',function(dbData, DbService){
$scope.dbData = dbData;
// You can also create and use another instance of the dbService here...
// to do whatever you programmed it to do, by adding functions inside the
// constructor DbService(), the following assumes you added
// a rmUser(userObj) function in the factory
$scope.removeDbUser = function(user){
DbService.rmUser(user);
}
})
Possible Alternatives
The following alternative is a similar approach, but allows definition to occur within the .config, encapsulating the service to within the specific module in the context of your app. Choose the method that right for you. Also see below for notes on a 3rd alternative and helpful links to help you get the hang of all these things
app.config(function($routeProvider, $provide) {
$provide.service('dbService',function(){})
//set up your service inside the module's config.
$routeProvider
.when('/', {
templateUrl: "partials/editor.html",
controller: "AppCtrl",
resolve: {
data:
}
})
});
A few helpful Resources
John Lindquist has an excellent 5 minute explanation and demonstration of this at egghead.io, and it's one of the free lessons! I basically modified his demonstration by making it $http specific in the context of this request
View the AngularJS Developer guide on Providers
There is also an excellent explanation about factory/service/provider at clevertech.biz.
The provider gives you a bit more configuration over the .service method, which makes it better as an application level provider, but you could also encapsulate this within the config object itself by injecting $provide into config like so:
Alex provided the correct reason for not being able to do what you're trying to do, so +1. But you are encountering this issue because you're not quite using resolves how they're designed.
resolve takes either the string of a service or a function returning a value to be injected. Since you're doing the latter, you need to pass in an actual function:
resolve: {
data: function (dbService) {
return dbService.getData();
}
}
When the framework goes to resolve data, it will inject the dbService into the function so you can freely use it. You don't need to inject into the config block at all to accomplish this.
Bon appetit!
Short answer: you can't. AngularJS won't allow you to inject services into the config because it can't be sure they have been loaded correctly.
See this question and answer:
AngularJS dependency injection of value inside of module.config
A module is a collection of configuration and run blocks which get
applied to the application during the bootstrap process. In its
simplest form the module consist of collection of two kinds of blocks:
Configuration blocks - get executed during the provider registrations and configuration phase. Only providers and constants
can be injected into configuration blocks. This is to prevent
accidental instantiation of services before they have been fully
configured.
I don't think you're supposed to be able to do this, but I have successfully injected a service into a config block. (AngularJS v1.0.7)
angular.module('dogmaService', [])
.factory('dogmaCacheBuster', [
function() {
return function(path) {
return path + '?_=' + Date.now();
};
}
]);
angular.module('touch', [
'dogmaForm',
'dogmaValidate',
'dogmaPresentation',
'dogmaController',
'dogmaService',
])
.config([
'$routeProvider',
'dogmaCacheBusterProvider',
function($routeProvider, cacheBuster) {
var bust = cacheBuster.$get[0]();
$routeProvider
.when('/', {
templateUrl: bust('touch/customer'),
controller: 'CustomerCtrl'
})
.when('/screen2', {
templateUrl: bust('touch/screen2'),
controller: 'Screen2Ctrl'
})
.otherwise({
redirectTo: bust('/')
});
}
]);
angular.module('dogmaController', [])
.controller('CustomerCtrl', [
'$scope',
'$http',
'$location',
'dogmaCacheBuster',
function($scope, $http, $location, cacheBuster) {
$scope.submit = function() {
$.ajax({
url: cacheBuster('/customers'), //server script to process data
type: 'POST',
//Ajax events
// Form data
data: formData,
//Options to tell JQuery not to process data or worry about content-type
cache: false,
contentType: false,
processData: false,
success: function() {
$location
.path('/screen2');
$scope.$$phase || $scope.$apply();
}
});
};
}
]);
You can use $inject service to inject a service in you config
app.config(function($provide){
$provide.decorator("$exceptionHandler", function($delegate, $injector){
return function(exception, cause){
var $rootScope = $injector.get("$rootScope");
$rootScope.addError({message:"Exception", reason:exception});
$delegate(exception, cause);
};
});
});
Source: http://odetocode.com/blogs/scott/archive/2014/04/21/better-error-handling-in-angularjs.aspx
** Explicitly request services from other modules using angular.injector **
Just to elaborate on kim3er's answer, you can provide services, factories, etc without changing them to providers, as long as they are included in other modules...
However, I'm not sure if the *Provider (which is made internally by angular after it processes a service, or factory) will always be available (it may depend on what else loaded first), as angular lazily loads modules.
Note that if you want to re-inject the values that they should be treated as constants.
Here's a more explicit, and probably more reliable way to do it + a working plunker
var base = angular.module('myAppBaseModule', [])
base.factory('Foo', function() {
console.log("Foo");
var Foo = function(name) { this.name = name; };
Foo.prototype.hello = function() {
return "Hello from factory instance " + this.name;
}
return Foo;
})
base.service('serviceFoo', function() {
this.hello = function() {
return "Service says hello";
}
return this;
});
var app = angular.module('appModule', []);
app.config(function($provide) {
var base = angular.injector(['myAppBaseModule']);
$provide.constant('Foo', base.get('Foo'));
$provide.constant('serviceFoo', base.get('serviceFoo'));
});
app.controller('appCtrl', function($scope, Foo, serviceFoo) {
$scope.appHello = (new Foo("app")).hello();
$scope.serviceHello = serviceFoo.hello();
});
Using $injector to call service methods in config
I had a similar issue and resolved it by using the $injector service as shown above. I tried injecting the service directly but ended up with a circular dependency on $http. The service displays a modal with the error and I am using ui-bootstrap modal which also has a dependency on $https.
$httpProvider.interceptors.push(function($injector) {
return {
"responseError": function(response) {
console.log("Error Response status: " + response.status);
if (response.status === 0) {
var myService= $injector.get("myService");
myService.showError("An unexpected error occurred. Please refresh the page.")
}
}
}
A solution very easy to do it
Note : it's only for an asynchrone call, because service isn't initialized on config execution.
You can use run() method. Example :
Your service is called "MyService"
You want to use it for an asynchrone execution on a provider "MyProvider"
Your code :
(function () { //To isolate code TO NEVER HAVE A GLOBAL VARIABLE!
//Store your service into an internal variable
//It's an internal variable because you have wrapped this code with a (function () { --- })();
var theServiceToInject = null;
//Declare your application
var myApp = angular.module("MyApplication", []);
//Set configuration
myApp.config(['MyProvider', function (MyProvider) {
MyProvider.callMyMethod(function () {
theServiceToInject.methodOnService();
});
}]);
//When application is initialized inject your service
myApp.run(['MyService', function (MyService) {
theServiceToInject = MyService;
}]);
});
Well, I struggled a little with this one, but I actually did it.
I don't know if the answers are outdated because of some change in angular, but you can do it this way:
This is your service:
.factory('beerRetrievalService', function ($http, $q, $log) {
return {
getRandomBeer: function() {
var deferred = $q.defer();
var beer = {};
$http.post('beer-detail', {})
.then(function(response) {
beer.beerDetail = response.data;
},
function(err) {
$log.error('Error getting random beer', err);
deferred.reject({});
});
return deferred.promise;
}
};
});
And this is the config
.when('/beer-detail', {
templateUrl : '/beer-detail',
controller : 'productDetailController',
resolve: {
beer: function(beerRetrievalService) {
return beerRetrievalService.getRandomBeer();
}
}
})
Easiest way:
$injector = angular.element(document.body).injector()
Then use that to run invoke() or get()