将所有指令传递给组件的子元素 [英] Passing on all directives to a child element of the component

问题描述

我有一些自定义指令，这些指令基本上是为<input>设计的. 我有一个自定义组件<app-decorated-input>

I have a few custom directives which are basically designed for <input>. And I have a custom component <app-decorated-input>

在我的应用程序中有很多<app-decorated-input>和简单的<input>，其中一些我喜欢使用指令，而其他一些我不喜欢使用.像这样使用指令时，如何将指令传递给基础<input>:

There are a ton <app-decorated-input>s along with simple <input>s in my application for some of which I like to use the directives and for others I don't. How do I pass on the directives to the underlying <input> when the directive is used like so:

<app-decorated-input directive1 directive2 ></app-decorated-input>

，并且这些指令对基础<input>的效果与直接在其上使用的效果相同:

and have the same effect of the directives on the underlying <input> as if it were used directly on it:

 <input type="text" directive1 directive2 >

更新:

<app-decorated-input>内的内容没有多大意义，除了它包含一个<input>的事实(我已经提到过).其模板看起来类似于:

UPDATE:

What lies inside <app-decorated-input> is not much of relevance except the fact that it contains an <input> as I have already mentioned. Its template looks something similar to:

<div> Some decorations here </div>
<div> 
  <input type="text" {...directives}> <!-- In ReactJS this is done by using {...this.props} -->
</div>
<div> Some decorations here too! </div>

我要做的就是将<app-decorated-input>上指定的所有指令都转移到基础<input>.

All I want to do is transfer all the directives specified on the <app-decorated-input> to the underlying <input>.

推荐答案

您可以使每个指令都提供自己，就像使用ControlValueAccessor或验证程序完成

You can make every directive provide itself like it is done with ControlValueAccessor or validators

export const MY_DIRECTIVES = new InjectionToken<any>('MyDirectives');

export const MY_DIRECTIVE1: Provider = {
  provide: MY_DIRECTIVES,
  useExisting: forwardRef(() => MyDirective1),
  multi: true
};

@Directive({
  selector: '....',
  providers: [MY_DIRECTIVE1]
})
class MyDirective1 {}

然后在您的输入组件中

constructor(@Optional() @Self() @Inject(MY_DIRECTIVES) private myDirectives: any[]) {
  console.log(myDirectives);
}

这篇关于将所有指令传递给组件的子元素的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！