Angular:如何通过Injector传递ngComponentOutlet中的数据

问题描述

我正在尝试动态创建和显示组件，我需要向其中传递一些数据，以便它知道要显示什么.

I'm trying to dynamically create and show component and i need to pass some data into it, so that it knows what to show.

这是我的代码:

html部分:

<div class="basicContainer">
  <div class="projectsTreeContainer">


    <input type="text" id="searchWord" placeholder="Search through projects"/>

    <button (click)="loadAddProject()">Add new Project</button>

    <app-projects-tree (onLoadProjectDetails)="loadProjectDetails($event)"
                       (onLoadWpDetails)="loadWpDetails($event)"
                       (onSelectAndLoadJobDetails)="loadJobDetails($event)"></app-projects-tree>
  </div>

  <div class="infoContainer">
    <ng-container *ngComponentOutlet="details"></ng-container>
  </div>

</div>

组件:

export class ProjectsComponent implements OnInit {

  details: Component;
  private showWp: boolean;

  constructor() {
  }


  loadProjectDetails(project: BasicProject): void {
     this.details = new ProjectComponent(project);
  }

以及我要动态创建和显示的组件:

and the component i want dynamically create and show:

export class ProjectComponent implements OnInit {

  project: Project;

  constructor(basicProject: BasicProject) {
    this.project = new Project();
    this.project.name = basicProject.name ;
  }

NgModule:

@NgModule({
  declarations: [
    AppComponent,
    NavbarComponent,
    LoginComponent,
    ProjectsComponent,
    ProjectComponent,
    ProjectsTreeComponent,
    TreeProjectComponent,
    TreeWpComponent,
    WpComponent,
    JobComponent,
    AddProjectComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    RouterModule.forRoot(
      AppRoutes.appRoutes,
      // {enableTracing: true} // <-- debugging purposes only
    ),
    HttpClientModule,
    HttpModule
  ],
  providers: [
    AuthenticationService,
    ProjectsService,
    CanActivateAuthGuard,
    {
      provide: HTTP_INTERCEPTORS,
      useClass: AuthInterceptor,
      multi: true
    }],
  bootstrap: [AppComponent],
  entryComponents: [ProjectComponent, WpComponent, JobComponent, AddProjectComponent]
})

错误消息:

我该如何完成任务?谢谢.

How can i do the task?Thanks.

推荐答案

如果打开 NgComponentOutlet 指令的代码:

@Directive({selector: '[ngComponentOutlet]'})
export class NgComponentOutlet implements OnChanges, OnDestroy {
  @Input() ngComponentOutlet: Type<any>;
  @Input() ngComponentOutletInjector: Injector;

您会注意到，它需要输入 ngComponentOutlet 输入，该输入应具有 Type< any> 类型，但是您正在将对象传递给它.

you can notice that it takes ngComponentOutlet input that should have type Type<any> but you're passing object to it.

我们还可以看到该指令可以将 Injector 用作 @Input .因此，让我们利用这些知识来完成您的任务.

Also we can see that this directive can take Injector as @Input. So lets leverage this knowledge to do your task.

例如，我们编写了如下模板:

For example we wrote template like:

<ng-container *ngComponentOutlet="component; injector: injector"></ng-container>

现在让我们在组件类中声明 component 和 injector 属性:

Now lets declare component and injector properties in component class:

@Component({...})
export class AppComponent  {
  
  component: Type<any>;
  injector: Injector;

  constructor(private inj: Injector) {}

  ngOnInit() {
    this.component = ProjectComponent; // note: we're passing type here
    this.injector = Injector.create([
      { provide: BasicProject, useValue: new Project('test name') }
    ], this.inj);
  }
}

和您的 ProjectComponent 现在使用角度DI机制来获取传递给注射器的数据:

and your ProjectComponent now uses angular DI mechanism to get data we passed to injector:

export class ProjectComponent {
  name: string;

  constructor(project: BasicProject) {
    this.name = project.name;
  }
}

Stackblitz示例

Stackblitz Example

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