Javascript 如何在控制器中动态注入依赖

How to $inject dynamically dependence in a controller

提问by Yacine Rezgui

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

我仍然是 Angularjs 的新手。我想在我的控制器中动态注入一个服务（我创建的）的依赖项。

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

但是，当我编写具有依赖项的服务时，出现此错误：

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

错误：未知提供者：$windowProvider <- $window <- base64

This is the code of the controller.

这是控制器的代码。

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

This code works:

此代码有效：

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 :

此代码不起作用：

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) :

另一个问题是当服务与控制器在同一个模块中时。如果模块有依赖项，我将无法工作（我的模块配置中有 $routeProvider 依赖项）：

Error: Unknown provider: $routeProvider from mainModule

错误：未知提供者：来自 mainModule 的 $routeProvider

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

JS Fiddles

JS小提琴

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

具有依赖项（控制器 + 服务）的相同模块：http: //jsfiddle.net/yrezgui/YedT2/

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

具有依赖项的不同模块：http: //jsfiddle.net/yrezgui/YedT2/4/

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

没有依赖项的不同模块：http: //jsfiddle.net/yrezgui/YedT2/5/

回答by Mark Rajcok

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

不要调用 angular.injector() —— 这会创建一个新的注入器。相反，将已经创建的$injector注入您的控制器并使用它：

So instead of:

所以而不是：

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

Do this:

做这个：

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:

但是大多数时候你应该直接注入你的服务，而不是动态注入，像这样：

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

See also AngularJS dynamically inject scope or controller

另请参阅AngularJS 动态注入作用域或控制器