angular - 如何动态地将组件添加到服务中的另一个组件

Question

我会动态地组件到服务中的另一个组件，首先在服务工厂内部这两个组件，我创建了可以访问 ViewContainer 的组件。但是无法创建组件!

服务:

@Injectable({
    providedIn: 'root'
})
export class ModalService {

    componentRef: ComponentRef<ModalTemplateComponent>;

    constructor(private _modalService: BsModalService,
                private resolver: ComponentFactoryResolver,
                private injector: Injector) {
    }

    open(componentType: any) {

        const contentFactory = this.resolver
            .resolveComponentFactory(componentType);

        const templateFactory = this.resolver
            .resolveComponentFactory(ModalTemplateComponent);

        const componentRef = templateFactory.create(this.injector);
        componentRef.instance.container.createComponent(contentFactory);

this._modalService.show(componentRef.componentType, {class: 'modal-lg', initialState: {data: {test:true}});

    }
}

组件:

    selector: 'lib-modal-template',
    template: `
        <h1>{{title}}</h1>
        <ng-container #container>
        </ng-container>
    `,
    styleUrls: ['./modal-template.component.css']
})
export class ModalTemplateComponent implements OnInit {

        title:string;
    @ViewChild('container', {read: ViewContainerRef, static: true}) container: ViewContainerRef;
}

例子:

this._modalService.open(NewUserForm,...);

Answer 1

首先，这一行将创建 ModalTemplateComponent 的新实例，而不是 componentRef，因此您不是在同一个实例上工作。

this._modalService.show(componentRef.componentType, {class: 'modal-lg', initialState: {data: {test:true}}});

我做了一些调整(使用 ngComponentOutlet)，它会按你预期的那样工作:

模态服务

@Injectable({
  providedIn: 'root'
})
export class ModalService {

  constructor(private _modalService: BsModalService,
    private resolver: ComponentFactoryResolver,
    private injector: Injector) {
  }

  open(componentType: any) {

    const ref = this._modalService.show(ModalTemplateComponent, {class: 'modal-lg', initialState: {data: {test:true}}});

    (ref.content as ModalTemplateComponent).componentType = componentType;

  }

}

ModalTemplateComponent

@Component({
  selector: 'app-modal-template',
  template: `
  <h1>{{title}}</h1>
  <ng-container *ngComponentOutlet="componentType">
  </ng-container>
  `,
  styleUrls: ['./modal-template.component.css']
})
export class ModalTemplateComponent implements OnInit {
  title: string = 'modal-template';

  @Input() componentType: any;

  constructor() { }

  ngOnInit() {
  }

}

在线演示:https://stackblitz.com/edit/angular-1srnej?file=src%2Fapp%2Fmodal.service.ts

===============================

如果您想使用动态组件实例，我们可以使用以下解决方案:

ModalTemplateComponent

@Component({
  selector: 'app-modal-template',
  template: `
  <h1>{{title}}</h1>
  <ng-container #container>
  </ng-container>
  `,
  styleUrls: ['./modal-template.component.css']
})
export class ModalTemplateComponent implements OnInit, OnDestroy {
  title: string = 'modal-template';
  component: any;
  componentRef: ComponentRef<any>;
  @Input() set componentType(c: any) {
    this.component = c;

    this.renderContent();
  }

  @ViewChild('container', {
    read: ViewContainerRef,
    static: true
  }) container: ViewContainerRef;

  constructor() { }

  ngOnInit() {
  }
  renderContent() {
    this.container.clear();
    const injector = this.container.injector;
    const cfr = injector.get(ComponentFactoryResolver);

    const componentFactory = cfr.resolveComponentFactory(this.component);

    const componentRef = this.container.createComponent<any>(componentFactory);

    componentRef.instance.content = 'content from ' + this.title;

    this.componentRef = componentRef;

  }
  ngOnDestroy() {
    if (this.componentRef) {
      this.componentRef.destroy();
    }
  }
}

AlertContentComponent

export class AlertContentComponent implements OnInit {
  @Input() content = '';
  constructor() { }

  ngOnInit() {
  }

}

演示:https://stackblitz.com/edit/angular-ythykh?file=src%2Fapp%2Fmodal-template%2Fmodal-template.component.ts