将变量传递给ng-content

时间:2018-08-12 08:45:13

标签: angular angular5 angular6

如何将ngFor变量传递给ng-content模板。

示例,包含组件:

<ul>
    <li *ngFor="let item of itemsArray">
       <ng-content></ng-content>
    </li>
</ul>

嵌套的内容组件:

<div>
    <span *ngIf="item.type_one"></span>
    <span *ngIf="item.type_two"></span>
</div>

均为示例

<containing-component>
    <content-component>
    </content-component>
</containing-component>

1 个答案:

答案 0 :(得分:2)

您不能将ng-content用作动态模板。请改用ng-template

<ul>
    <li *ngFor="let item of itemsArray">
       <ng-container *ngTemplateOutlet="itemTemplate; context: { $implicit: item  }">
       </ng-container>
    </li>
</ul>
export class ContainingComponent {

  ...

  @ContentChild(TemplateRef) 
  @Input() itemTemplate: TemplateRef<any>;
}

因此您可以将动态模板引用到containing-component中。在这种情况下,您可以将ng-template包装在content-component

<containing-component [itemTemplate]="itemTmpl">
</containing-component>

<ng-template #itemTmpl let-data>

    <content-component
      [item]="data">
    </content-component>
</ng-template>

或使用ng-template directly

<containing-component 
   [itemTemplate]="itemTmpl"
   [itemArray]="items">
</containing-component>

<ng-template #itemTmpl let-data>
  <div>
    <span *ngIf="data.type_one"></span>
    <span *ngIf="data.type_two"></span>
  </div>
</ng-template>