如何从指令访问主机组件? [英] How to access host component from directive?

问题描述

说我有以下标记:

<my-comp myDirective></my-comp>

有什么方法可以从指令中访问组件实例 ?

Is there any way I can access the component instance from the directive?

更具体地说，我希望能够从MyDirective访问MyComponent的属性和方法，最好是不向上方的HTML添加任何内容.

More specifically I want to be able to access the properties and methods of MyComponent from MyDirective, ideally without adding anything to the HTML above.

推荐答案

您可以直接注入

class MyDirective {
  constructor(private host:MyComponent) {}

一个严重的限制是，您需要提前知道组件的类型.

A severe limitation is, that you need to know the type of the component in advance.

另请参见 https://github.com/angular/angular/issues/8277
当您事先不知道类型时，它还提供了一些解决方法.

See also https://github.com/angular/angular/issues/8277
It also provides some workarounds for when you don't know the type in advance.

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