Angular2 viewContainerRef.createComponent正常工作

Question

我使用viewContainerRef.createComponent将动态组件加载到根组件（.....）中，但实际上它附加了错误的地方，

我的代码：

- - - - - - - - app.compoment.ts

export class AppComponent { 
   private viewContainerRef:ViewContainerRef;
   public constructor(viewContainerRef:ViewContainerRef) {
    this.viewContainerRef = viewContainerRef;
  }
}

----- ------ a.service.ts

@Injectable()
export class ModalService {
  private viewContainerRef:ViewContainerRef;
    constructor(applicationRef: ApplicationRef, injector: Injector,private compiler: ComponentResolver) { 
        var classOfRootComponent = applicationRef.componentTypes[0];
        // this is an instance of application bootstrap component
        var appInstance = injector.get(classOfRootComponent);
        this.viewContainerRef= appInstance.viewContainerRef;
    }
    alert() {console.log(this.viewContainerRef);
        this.compiler.resolveComponent(ModalComponent)
        .then(
            (factory) =>
            this.viewContainerRef.createComponent(factory, 0, this.viewContainerRef.injector)
        ).then((componentRef) => {
                return componentRef;
            }
        );
    }
}

Answer 1

这是＆＃34;按照设计＆＃34;。另见此讨论https://github.com/angular/angular/issues/9035

如果您希望在<custom-modal>内插入<my-app>，请将目标元素添加到<my-app>的模板中，并将其用作目标。

您需要将其从AppComponent传递到ModalService

@Component({
  selector: 'my-app',
  template: `<div #target></div>`
})
export class AppComponent {
  @ViewChild('target', {read: ViewContainerRef}) viewContainerRef:ViewContainerRef;

  constructor(private modalService:ModalService) {}

  ngAfterViewInit() {
    this.modalService.viewContainerRef = this.viewContainerRef;
  }
}

这个PR是一个类似的用例，可能会让您感兴趣https://github.com/angular/angular/pull/9393