如何遍历Angular 2 ng-content项目？

Question

有谁知道如何遍历Angular 2 ng-content项吗？

我需要检查在ng-content中存在的项上定义的属性的值是什么。有谁知道怎么弄到它们吗？

最好的方案是在其中获取实际的组件实例，因为我可以在组件中设置一些内部属性，直接访问它们会很棒！

一些示例代码：

// ====================== Container Component =======================

import * as ng from "angular2/angular2";

@ng.Component({
    selector: 'grid-layout',
    lifecycle: [ng.onInit]
})

@ng.View({
        templateUrl: `<div><ng-content></ng-content></div>`
})

export class GridLayout
{
    constructor(){

    }

    private onInit(): void {
         // ??? something like this.ngContent would be great :)
    }
}

// ====================== Caller Component =======================
import * as ng from "angular2/angular2";

@ng.Component({
    selector: 'my-page'
})

@ng.View({
    templateUrl: `
<grid-layout>
    <div data-att1="container 1">1</div>
    <div data-att2="container 2">2</div>
    <div>3</div>
</grid-layout>`,
    directives:[GridLayout]
})

export class MyPage
{
    constructor(){

    }
}

Answer 1

只需使用@ContentChildren注入轻量级DOM的内容

ParentComponent implements AfterContentInit{
  @ContentChildren(ChildComponent) contents : QueryList<ChildComponent>; 

  ngAfterContentInit()
  {
     //access contents here
  }

}