2

我想知道如何创建嵌套的动态组件并维护其父子关系。

例如,我有这样的数据,

- A
--A.1
--A.2
-B
--B.1
-C 

我想创建这样的组件,

<A>
   <A1></A1>
   <A2></A2>
</A>
<B>
   <B1></B1>
</B>
<C></C>

但是使用我的代码,我只能创建父组件或子组件。但不是两者兼而有之。

下面是我的代码,

  setRootViewContainerRef(view: ViewContainerRef): void {
    this.rootViewContainer = view;
  }

  createComponent(content: any, type: any) {
 console.log(content);
    if (content.child && content.child.length > 0) {
      content.child.forEach(type => {
        const typeP = this.contentMappings[type.type];
        this.createComponent(type, typeP);
      });
    } else {
      this.renderComp(content,type)
    }
  }

  renderComp(content,type) {
    if (!type) {
      return
    }
    this.componentFactory = this.componentFactoryResolver.resolveComponentFactory(type);
    this.componentReference = this.rootViewContainer.createComponent(this.componentFactory);

    if (this.componentReference.instance.contentOnCreate) {
      this.componentReference.instance.contentOnCreate(content);
    }
  }

使用此代码,我得到此输出。

链接到工作示例,StackBlitz

请帮我解决这个问题。


更新。

即使添加了viewChild,它仍然会抛出viewchild not defined

请参阅此图片,在 component.instance 中我没有看到视图子元素。

在此处输入图像描述

更新了 stackblitz 链接https://stackblitz.com/edit/angular-dynamic-new-mepwch?file=src/app/content/a/a.component.ts

4

1 回答 1

4

您应该在要呈现子组件的每个级别上创建 ViewContainer:

a.component.html

<p>
a works!
</p>
<ng-container #container></ng-container>

a.component.ts

export class AComponent implements OnInit {
  @ViewChild('container', { read: ViewContainerRef, static: true }) embeddedContainer: ViewContainerRef;

然后将组件渲染到专用容器:

创建动态component.service.ts

@Injectable()
export class CreateDynamicComponentService {
  constructor(
    private componentFactoryResolver: ComponentFactoryResolver,
    @Inject(CONTENT_MAPPINGS) private contentMappings: any,
    private inlineService: InlineService
  ) { }


  createComponent(content: any, type: any, vcRef) {
    const componentRef = this.renderComp(content, type, vcRef)
    if (content.child && content.child.length) {
      if (!componentRef.instance.embeddedContainer) {
        const cmpName = componentRef.instance.constructor.name;
        throw new TypeError(`Trying to render embedded content. ${cmpName} must have @ViewChild() embeddedContainer defined`);
      }

       content.child.forEach(type => {
        const typeP = this.contentMappings[type.type];
        this.createComponent(type, typeP, componentRef.instance.embeddedContainer);
      });
    }
  }

  renderComp(content,type, vcRef: ViewContainerRef) {
    const componentFactory = this.componentFactoryResolver.resolveComponentFactory(type);
    const componentRef = vcRef.createComponent<any>(componentFactory);

    if (componentRef.instance.contentOnCreate) {
      componentRef.instance.contentOnCreate(content);
    }

    return componentRef;
  }
}

请注意renderComp方法如何ViewContainerRef从带有子组件的组件中获取:

 this.createComponent(type, typeP, componentRef.instance.embeddedContainer);

分叉的 Stackblitz

于 2019-07-25T19:13:37.490 回答