如何将组件动态添加到服务中的另一个组件

Posted 2023-03-13

【中文标题】如何将组件动态添加到服务中的另一个组件

【英文标题】：How to dynamically add component to another component in service

【发布时间】：2020-01-05 22:53:52

【问题描述】：

我将动态组件到服务中的另一个组件，首先在服务工厂内部两个组件，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;

示例：

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

【参考方案1】：

首先，此行将创建ModalTemplateComponent 的新实例，而不是componentRef，因此您不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），它会按你的预期工作：

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;

  

模态模板组件

@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：

模态模板组件

@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

【讨论】：

谢谢，如何在警报组件中访问模板组件formGroup？

如果你想访问它，你可以动态渲染Alert Component而不是使用ngComponentOutlet

等一下，我给你新建一个例子

@Allahyar 已更新 stackblitz.com/edit/…

你可以创建新帖子，我稍后再尝试。问候