Question

嗨，我想使用以下服务来动态添加组件。

我正在构建一个聊天应用程序，其中动态添加了消息组件。

import {
    Injectable,
    Injector,
    ComponentFactoryResolver,
    EmbeddedViewRef,
    ApplicationRef
} from '@angular/core';

@Injectable()
export class DomService {

  constructor(
      private componentFactoryResolver: ComponentFactoryResolver,
      private appRef: ApplicationRef,
      private injector: Injector
  ) { }

  appendComponentToBody(component: any) {
    // 1. Create a component reference from the component 
    const componentRef = this.componentFactoryResolver
      .resolveComponentFactory(component)
      .create(this.injector);

    // 2. Attach component to the appRef so that it's inside the ng component tree
    this.appRef.attachView(componentRef.hostView);

    // 3. Get DOM element from component
    const domElem = (componentRef.hostView as EmbeddedViewRef<any>)
      .rootNodes[0] as HTMLElement;

    // 4. Append DOM element to the body
    document.body.appendChild(domElem);

    // 5. Wait some time and remove it from the component tree and from the DOM
    setTimeout(() => {
        this.appRef.detachView(componentRef.hostView);
        componentRef.destroy();
    }, 3000);
  }
}

有人可以帮助我如何使用此服务吗？

假设我有一个消息组件，如何将组件传递给该服务？

Answer 1

让我们说您要渲染一个组件

@Component(...)
export class MyComponent {
}

您应将其作为模块的entryComponent提供

@NgModule({
  declarations: [MyComponent],
  entryComponents: [MyComponent]
})
export class SomeModule {
}

然后在任何可以打电话的地方

class Anything {
 constructor(private domService: DomService){}
 doRender(){ this.domService.appendComponentToBody(MyComponent);}
}

如何动态添加角度组件？

1 个答案: