使用递归数组加载递归组件 [英] Recursive component loading with recursive array

问题描述

我正在尝试使用递归数组递归加载Angular 2组件（plunk： http： //plnkr.co/edit/3npsad?p=preview ）。

I'm trying to load an Angular 2 component recursively with a recursive array (plunk: http://plnkr.co/edit/3npsad?p=preview).

给定这个递归数组：

[
  {
    "id": 1,
    "text": "abc"
  },
  {
    "id": 2,
    "text": "def",
    items: [
      {
        "id": 21,
        "text": "def-1",
        items: [
          {
            "id": 211,
            "text": "def-1-1"
          },
          {
            "id": 212,
            "text": "def-1-2"
          }
        ]
      },
      {
        "id": 22,
        "text": "def-2"
      }
    ]
  }
]

我需要以下输出：

<my-item>
    <div id="1" text="abc"></div>
</my-item>
<my-item>
    <div id="2" text="def"></div>
    <my-item>
        <div id="21" text="def-1"></div>
        <my-item>
            <div id="211" text="def-1-1"></div>
        </my-item>
        <my-item>
            <div id="212" text="def-1-2"></div>
        </my-item>
    </my-item>
    <my-item>
        <div id="22" text="def-2"></div>
    </my-item>
</my-item>

我只能在我的plunk中显示第一级输入。如何使我的组件递归迭代以呈现所需的输出？输入数组可以包含任意数量的元素和嵌套。

I could only render the first level of input as show in my plunk. How can I make my component iterate recursively to render the desired output? The input array can contain any number of elements and nesting.

谢谢！

推荐答案

更新

引入 @NgModule 并迁移不应再需要指令到 @NgModule forwardRef 。

With the introduction of @NgModule and the migration of directives to @NgModule forwardRef shouldn't be necessary anymore.

原始

<my-item *ngFor="let itm of items" [id]="itm.id" [text]="itm.text" [items]="itm.items" >
</my-item>

@Component({
  selector: 'my-item',
  styles: ['div {padding-left: 32px;}']
  providers: [],
  template: `<div>{{id}} - {{text}}
    <my-item *ngFor="let itm of items" [id]="itm.id" [text]="itm.text" [items]="itm.items" >
    </my-item>
    </div>

  `,
  directives: [forwardRef(()=> ItemComponent)]
})
export class ItemComponent {
  @Input() id: string;
  @Input() text: string;
  @Input() items: any[];
  constructor() {
  }
}

forwardRef 是必需的，因为在声明类之前引用了类 ItemComponent 。

forwardRef is required because the class ItemComponent is referenced before it is declared.

Plunker示例

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