无法访问angular typescript中指令内的自定义工厂

Question

我已经注入了storageService但是我尝试使用this.storageService在链接函数中访问它给出了undefined。

任何人都可以帮我吗？

module App.Directive {
  import Services = Core.Services;
  import Shared = Core.Shared;
  export class UserNav implements ng.IDirective {
    restrict = 'A';
    require: any = "^?ngModel";
    scope = true;
    templateUrl: any = "template/user-nav.html";
    link: ng.IDirectiveLinkFn = function(scope, element, attributes, ngModel: any) {
        var a = this.storageService.getItem("userInfo", false);
        console.log("getting > " + a);
    }
    constructor(public routerService: Services.RouterService,
        public storageService: Services.StorageService) {
    }
    static factory(): any {
        var directive = (routerService: Services.RouterService,
            storageService: Services.StorageService) => {
            return new UserNav(routerService, storageService);
        }
        directive['$inject'] = ['routerService', 'storageService'];
        return directive;
    }
  }
}

Answer 1

所以问题在于链接功能 变化

<击>

module App.Directive {
  import Services = Core.Services;
  import Shared = Core.Shared;
  export class UserNav implements ng.IDirective {
    restrict = 'A';
    require: any = "^?ngModel";
    scope = true;
    templateUrl: any = "template/user-nav.html";
    link: ng.IDirectiveLinkFn = function(scope, element, attributes, ngModel: any) {
        var a = this.storageService.getItem("userInfo", false);
        console.log("getting > " + a);
    }
    constructor(public routerService: Services.RouterService,
        public storageService: Services.StorageService) {
    }
    static factory(): any {
        var directive = (routerService: Services.RouterService,
            storageService: Services.StorageService) => {
            return new UserNav(routerService, storageService);
        }
        directive['$inject'] = ['routerService', 'storageService'];
        return directive;
    }
  }
}

要：

module App.Directive {
  import Services = Core.Services;
  import Shared = Core.Shared;
  export class UserNav implements ng.IDirective {
    restrict = 'A';
    require: any = "^?ngModel";
    scope = true;
    templateUrl: any = "template/user-nav.html";
    link(scope, element, attributes, ngModel: any) {
        var a = this.storageService.getItem("userInfo", false);
        console.log("getting > " + a);
    }
    constructor(public routerService: Services.RouterService,
        public storageService: Services.StorageService) {
    }
    static factory(): any {
        var directive = (routerService: Services.RouterService,
            storageService: Services.StorageService) => {
            return new UserNav(routerService, storageService);
        }
        directive['$inject'] = ['routerService', 'storageService'];
        return directive;
    }
  }
}

<击> 更新：以上答案不会奏效。因为链接函数用作回调，this是全局对象。您必须将服务设置为模块中的变量，然后您才能通过范围访问它。 see my fiddle