用递归数组加载递归组件

Question

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

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>

我只能渲染第一级输入，如我的plunk所示。我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。

谢谢!

Answer 1

update

随着@NgModule的引入和directives向@NgModule的迁移，forwardRef不再是必要的了。

原来

<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ItemComponent类在声明之前被引用。

<<p> 恰好例子/strong>

Answer 2

我将这样创建您的组件:

@Component({
  selector: 'my-item',
  template: `
    <div id="data.id" text="data.def"></div>
    <my-item *ngFor="let item of items" [data]="item"></my-item>
  `
})
export class MyItemComponent {
  @Input() data: any;
}

，并将其称为另一个组件中的组件，并提供整个组件数据:

@Component({
  selector: 'other-comp',
  template: `
    <my-item [data]="data" *ngFor="let data of wholeData"></my-item>
  `
})
export class OtherComponent {
  wholeData = [
    {
      "id": 1,
      "text": "abc"
    },
    (...)
  ];
}

Answer 3

这里有一些东西可以让你开始。您需要自己实现HTML返回函数:

  var a = [
  {
    "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"
      }
    ]
  }
];
function iterateRecursive(array) {
    for(var i = 0; i < array.length; i++) {
    if(array[i].items) {
        console.log(array[i].text);
      //uncomment: printHtml(array[i].id, array[i].text);
        iterateRecursive(array[i].items)
    } else {    
        console.log(array[i].text);         
    }
  }
}

iterateRecursive(a);
//implement this function that takes an id and text and returns html
//call it in place of console log
function printHtml(id, text) {
}