Angular 2-将依赖项注入装饰器工厂 [英] Angular 2 - Inject a dependency into a decorator factory

问题描述

是否有一种使用Angular的DI将依赖项注入到装饰器工厂的方法?让我们以下面的代码为简化示例:

Is there a way to inject a dependency into a decorator factory, using Angular's DI? Let's take the following code as a simplified example:

@Component({
  selector: 'hello-component',
  template: '<div>Hello World</div>'
})
export class HelloComponent {
  @PersonName()
  name: string;

  ngAfterViewInit() {
    console.log(`Hello, ${this.name}`);
  }
}

在这里，PersonName装饰器的预期行为是让它访问Person依赖项，并使用它来设置类的name属性.

Here, the intended behaviour of the PersonName decorator is for it to access a Person dependency, and use it to set the name property of the class.

是否可以为上面的代码实现PersonName装饰器?

Is it possible at all to implement the PersonName decorator for the code above?

推荐答案

当前，要将依赖项注入到我的装饰器(以及其他额外的模块类)中，我正在使用以下解决方法:

Currently, to inject dependencies into my decorators (and other extra module classes) I'm using this workaround:

import {Injectable, Injector} from "@angular/core";
@Injectable()
export class ExtraModuleInjector {
  private static injector;

  public static get(token: any) {
    if (ExtraModuleInjector.injector) {
      return ExtraModuleInjector.injector.get(token);
    }
  }

  constructor(public injector: Injector) {
    ExtraModuleInjector.injector = injector;
  }
}

在注入到根组件之后，它允许在运行时函数执行期间使用静态get方法获取依赖项. 仍在寻找更好的解决方案.

After being injected to root component, it allows to use static get method to get dependencies during runtime functions execution. Still looking for better solution.

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