javascript - How to $inject dynamically dependence in a controller

Question

I'm still a debutant on Angularjs. I want to inject dynamically a dependency of a service (that I created) in my controller.

But when I code a service with dependencies, I got this error :

Error: Unknown provider: $windowProvider <- $window <- base64

This is the code of the controller.

var base64 = angular.injector(['servicesModule']).get('base64');
console.log("base64", base64.encode("my text will be encoded"));

This code works:

var servicesModule = angular.module('servicesModule', []);
servicesModule.factory('base64', function() {
    return {

        name: 'base64',
        readonly: false,

        encode: function(input) {
            return window.btoa(input);
        },

        decode: function(input) {
            return window.atob(input);
        }

    };

});

This code doesn't work :

var extModule = angular.module('ext', []);
extModule.factory('base64', ['$window', function($window) {
    return {

        name: 'base64',
        readonly: false,

        encode: function(input) {
            return $window.btoa(input);
        },

        decode: function(input) {
            return $window.atob(input);
        }

    };

}]);

Another problem is when the service is in the same module as the controller. If the module has dependencies, I doesn't work (I have $routeProvider dependence in my module config) :

Error: Unknown provider: $routeProvider from mainModule

var mainModule = angular.module('main', [],
    function($routeProvider, $locationProvider) {
        //Some routing code
    }
);

JS Fiddles

Same module with dependencies(controller + service) : http://jsfiddle.net/yrezgui/YedT2/

Different module with dependencies : http://jsfiddle.net/yrezgui/YedT2/4/

Different module without dependencies : http://jsfiddle.net/yrezgui/YedT2/5/

Answer 1

Don't call angular.injector() -- this creates a new injector. Instead, inject the already-created $injector into your controller and use it:

So instead of:

var algoController = function($scope) {
    $scope.base64 = angular.injector(['main']).get('base64');
};

Do this:

var algoController = function($scope, $injector) {
    $scope.base64 = $injector.get('base64');
};

But most of the time you should inject your service directly, rather than dynamically, like so:

var algoController = function($scope, base64) {
    $scope.base64 = base64;
};

See also AngularJS dynamically inject scope or controller