I have a controller that it's not defined on $routeProvider. I use it internally inside other controllers. Is there a way to resolve a dependency without the $routeProvider?
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My friend below asked for more information, here it goes:
I don't want to call promise methods (basically then) inside my controllers. But I have dependencies on some of this controllers that are promises. When a controller is defined on the $routeProvider, I can resolve its dependencies. But how about the controllers that are not defined there? Is there any solution? Follows an example:
My $routeProvider doesn't map this controller and this is the code I have to do because my Cart is a promise:
.controller('MyCtrl', ['$scope', 'Cart',
function ($scope, Cart) {
Cart.then(function(res) {
$scope.cart = res.query();
});
This is the code I'd like to do:
.controller('MyCtrl', ['$scope', 'Cart',
function ($scope, Cart) {
$scope.cart = Cart.query();
});
if you mean resolve -- dependency injection -- yes. below should work:
element.injector().invoke(['dep1','dep2', function(dep1,dep2){}])
...
the idea is to retrieve the current injector, and use invoke().
Related
I have the following preloader.js factory file included in my project.
angular.module('movieSeat')
.factory('preloader', function( $q, $rootScope ) {
In my controller I inject the factory as following:
angular.module('movieSeat')
.controller('moviesearchCtrl', ['$scope', 'moviesearchFactory', function ($scope, moviesearchFactory, preloader) {
When I try to use the preloadImages function inside the preload controller:
$scope.imageLocations = [
"https://image.tmdb.org/t/p/w300_and_h450_bestv2//nlqFgG7jfBITl8fJHzL72jXwYLt.jpg",
"https://image.tmdb.org/t/p/w300_and_h450_bestv2//ghL4ub6vwbYShlqCFHpoIRwx2sm.jpg",
"https://image.tmdb.org/t/p/w300_and_h450_bestv2//weUSwMdQIa3NaXVzwUoIIcAi85d.jpg",
];
preloader.preloadImages($scope.imageLocations)
I get the following error:
Cannot read property 'preloadImages' of undefined
If I comment out the preloader.preloadImages($scope.imageLocations) code the error is gone. So to me it looks like injecting the preloader factory in my controller works fine but I can't figure out why I can't call the function preloadImages on the preload factory.
There's a typo in the dependency injection list. You forgot to add preloader in the list of dependency strings.
.controller('moviesearchCtrl', ['$scope', 'moviesearchFactory', 'preloader' /*here*/, function ($scope, moviesearchFactory, preloader) {
You need to reference your factory/service 'preloader' in your controller call as follows:
angular.module('movieSeat')
.controller('moviesearchCtrl', ['$scope', 'moviesearchFactory', 'preloader', function ($scope, moviesearchFactory, preloader) {
})
I'm new to angular and have the following code.
angular.module('MyApp')
.controller('loginController', ['$scope', '$http', 'conditionalDependency',
function ($scope, $http, conditionalDependency{
}
I would like to have conditionalDependency loaded conditionally. Something like this
if(true)
{
//add conditionalDependency
}
How can this be done. I've seen this post . However, my requirement is that I have the dependency specified in function
Thanks in advance.
Not quite clear as to why you would have to have it in a named function like in your example but...
If you need conditional dependencies, I would suggest taking a look at the following:
Conditional injection of a service in AngularJS
I've used this method in a couple niche scenarios and it works quite well.
EXAMPLE:
angular.module('myApp').controller('loginController',
['$injector', '$scope', '$http',
function($injector, $scope, $http) {
var service;
if (something) {
service = $injector.get('myService');
}
});
You can use it even without injecting injector in your controller
if(something){
var injector = angular.element(document).injector();
var myService = injector.get('myService')
}
Use:
angular.injector().get('conditionalDep');
You can inject $injector once to your file and call $injector.get('dep');
This may be a really simple question but I can't find anything in the ui-router docs. I want to call the $state.go() method to change a state in a controller, but I get a "$state not defined" error.
What is the dependency I need to put on my controller in order to be able to use $state and its methods?
It is the same as with any other service - include it's name in annotated dependency list or function arguments:
//without annotation (inferred, not safe when minifying code)
function Controller($scope, $state) {...}
//inline annotation
module.controller('Controller', ['$scope','$state', function($scope, $state) {...}]);
//$inject property annotation
function Controller($scope, $state) {...}
Controller.$inject = ['$scope', '$state'];
This is a noobie question:
I am playing with the Angular seed app and am trying to write a controller but am having no luck getting access to $scope (and any other dependency).
angular.module('myApp.controllers', []).
controller('mainCtrl', [function( $scope, $http ) {
$http.get('config/configuration.json').success( function( data ) {
$scope.gametitles = data.gametitles;
$scope.environments = data.environments;
$scope.playermanagerServer = data.playermanagerServer;
});
$scope.gametitle = $scope.gametitles[0];
$scope.environment = $scope.environments[0];
}])
If I break in the code, both $http and $scope are undefined. How do I get access to these?
Thanks in advance
I think the problem is in the syntax of your controller declaration. Try controller('mainCtrl', ['$scope', '$http', function ($scope, $http) { ... controller code ...}]);
you may want to check A's documentation for dependency injection in controllers here
Or,assuming you're not uglifying your code you could just use simpler injection formation:
controller('mainCtrl', function( $scope, $http ) {} )
(note that the function is not a member of an array, but passed directly)
I have this piece of layout html:
<body ng-controller="MainController">
<div id="terminal"></div>
<div ng-view></div>
<!-- including scripts -->
</body>
Now apparently, when I try to use $routeParams in MainController, it's always empty. It's important to note that MainController is supposed to be in effect in every possible route; therefore I'm not defining it in my app.js. I mean, I'm not defining it here:
$routeProvider.when("/view1", {
templateUrl: "partials/partial1.html"
controller: "MyCtrl1"
})
$routeProvider.when("/view2", {
templateUrl: "partials/partial2.html"
controller: "MyCtrl2"
})
// I'm not defining MainController here!!
In fact, I think my problem is perfectly the same as this one: https://groups.google.com/forum/#!topic/angular/ib2wHQozeNE
However, I still don't get how to get route parameters in my main controller...
EDIT:
What I meant was that I'm not associating my MainController with any specific route. It's defined; and it's the parent controller of all other controllers. What I'm trying to know is that when you go to a URL like /whatever, which is matched by a route like /:whatever, why is it that only the sub-controller is able to access the route parameter, whereas the main controller is not? How do I get the :whatever route parameter in my main controller?
The $routeParams service is populated asynchronously. This means it will typically appear empty when first used in a controller.
To be notified when $routeParams has been populated, subscribe to the $routeChangeSuccess event on the $scope. (If you're in a component that doesn't have access to a child $scope, e.g., a service or a factory, you can inject and use $rootScope instead.)
module.controller('FooCtrl', function($scope, $routeParams) {
$scope.$on('$routeChangeSuccess', function() {
// $routeParams should be populated here
});
);
Controllers used by a route, or within a template included by a route, will have immediate access to the fully-populated $routeParams because ng-view waits for the $routeChangeSuccess event before continuing. (It has to wait, since it needs the route information in order to decide which template/controller to even load.)
If you know your controller will be used inside of ng-view, you won't need to wait for the routing event. If you know your controller will not, you will. If you're not sure, you'll have to explicitly allow for both possibilities. Subscribing to $routeChangeSuccess will not be enough; you will only see the event if $routeParams wasn't already populated:
module.controller('FooCtrl', function($scope, $routeParams) {
// $routeParams will already be populated
// here if this controller is used within ng-view
$scope.$on('$routeChangeSuccess', function() {
// $routeParams will be populated here if
// this controller is used outside ng-view
});
);
As an alternate to the $timeout that plong0 mentioned...
You can also inject the $route service which will show your params immediately.
angular.module('MyModule')
.controller('MainCtrl', function ($scope, $route) {
console.log('routeParams:'+JSON.stringify($route.current.params));
});
I have the same problem.
What I discovered is that, $routeParams take some time to load in the Main Controller, it probably initiate the Main Controller first and then set $routeParams at the Child Controller. I did a workaround for it creating a method in the Main Controller $scope and pass $routeParams through it in the Child Controllers:
angular.module('MyModule')
.controller('MainController', ["$scope", function ($scope) {
$scope.parentMethod = function($routeParams) {
//do stuff
}
}]);
angular.module('MyModule')
.controller('MyCtrl1', ["$scope", function ($scope) {
$scope.parentMethod($routeParams);
}]);
angular.module('MyModule')
.controller('MyCtrl2', ["$scope", function ($scope) {
$scope.parentMethod($routeParams);
}]);
had the same problem, and building off what Andre mentioned in his answer about $routeParams taking a moment to load in the main controller, I just put it in a timeout inside my MainCtrl.
angular.module('MyModule')
.controller('MainCtrl', function ($scope, $routeParams, $timeout) {
$timeout(function(){
// do stuff with $routeParams
console.log('routeParams:'+JSON.stringify($routeParams));
}, 20);
});
20ms delay to use $routeParams is not even noticeable, and less than that seems to have inconsistent results.
More specifically about my problem, I was confused because I had the exact same setup working with a different project structure (yo cg-angular) and when I rebuilt my project (yo angular-fullstack) I started experiencing the problem.
You have at least two problems here:
with $routeParams you get the route parameters, which you didn't define
the file where you define a main controller doesn't really matter. the important thing is in which module/function
The parameters have to be defined with the $routeProvider with the syntax :paramName:
$routeProvider.when("/view2/name1/:a/name2/:b"
and then you can retrieve them with $routeParams.paramName.
You can also use the query parameters, like index.html?k1=v1&k2=v2.
app.js is the file where you'd normally define dependencies and configuration (that's why you'd have there the app module .config block) and it contains the application module:
var myapp = angular.module(...);
This module can have other modules as dependencies, like directives or services, or a module per feature.
A simple approach is to have a module to encapsulate controllers. An approach closer to your original code is putting at least one controller in the main module:
myapp.controller('MainCtrl', function ($scope) {...}
Maybe you defined the controller as a global function? function MainCtrl() {...}? This pollutes the global namespace. avoid it.
Defining your controller in the main module will not make it "to take effect in all routes". This has to be defined with $routeProvider or make the controller of each route "inherit" from the main controller. This way, the controller of each route is instantiated after the route has changed, whereas the main controller is instantiated only once, when the line ng-controller="MainCtrl" is reached (which happens only once, during application startup)
You can simply pass values of $routeParams defined into your controller into the $rootScope
.controller('MainCtrl', function ($scope, $routeParams, MainFactory, $rootScope) {
$scope.contents = MainFactory.getThing($routeParams.id);
$rootScope.total = MainFactory.getMax(); // Send total to the rootScope
}
and inject $rootScope in your IndexCtrl (related to the index.html)
.controller('IndexCtrl', function($scope, $rootScope){
// Some code
});