我现在有点迷茫,需要帮助。所以,我有一个组件使用 componentFactoryResolver 将子组件动态注入(inject)到它的模板中,这是我的 HTML
<div class="dialog">
<div #container></div>
<button (click)="move('back')">Back</button>
<button (click)="move('forwards')">Forwards</button>
</div>
同样在我的组件中,我有一个 observable 可以捕获按钮的点击,就像这样,这是我的(编辑/简化的)代码
// parent-component.ts
@ViewChild('container', {read: ViewContainerRef})
public dialogContainer: ViewContainerRef;
public navigationClick$: Observable<string> = new Subject<string>();
// click event on buttons
public move(direction): void {
this.navigationClick$.next(direction);
}
// code to inject child dynamic component, please ignore the args / variables
const componentFactory = this.componentFactoryResolver.resolveComponentFactory(this.data.component);
this.componentRef = this.dialogContainer.createComponent(componentFactory);
this.embeddedcomponent = this.componentRef.instance as IWizardDialog;
this.embeddedcomponent.data = this.data.data;
现在我想将最新的可观察值从 navigationClick$ 传递给子组件我修改父组件中的代码...
const componentFactory = this.componentFactoryResolver.resolveComponentFactory(this.data.component);
this.componentRef = this.dialogContainer.createComponent(componentFactory);
// NEW CODE
// here I subscribe to the observable and try to pass the value to the child component
this.navigationClick$.subscribe((data: string) => {
this.componentRef.instance.direction = data;
});
this.embeddedcomponent = this.componentRef.instance as IWizardDialog;
this.embeddedcomponent.data = this.data.data;
正如我所期望的那样,订阅在父组件中工作,但是我不确定如何捕获订阅数据/将订阅数据传递给子组件,例如,我是否可以将其声明为 Input()
// child-component.ts
@Input() public direction: string;
然而,这只是未定义的,不是我需要的。如何将订阅中的方向数据传递给子组件,或者我需要什么代码/功能来接收事件/方向字符串?任何建议表示赞赏。
如果我的措辞不好或令人困惑,请说出来,我会重做这个问题。
最佳答案
我会使用服务。不是 ViewChild。有了服务,组件就不需要知道彼此了
@Injectable()
export class YourService {
move$: Observable<any>;
private moveSubject: Subject<any> = new Subject();
constructor() {
this.move$ = this.moveSubject.asObservable();
}
public move(direction) {
this.moveSubject.next(direction);
}
}
父类中的用法
contructor(public yourService:YourService){
}
父级中的html
<button (click)="yourService.move('back')">Back</button>
在 child 中的应用
YourChild implements OnInit, OnDestroy {
private subscriptions: Subscription = new Subscription();
constructor(private yourService:YourService) {
}
ngOnInit(): void {
this.subscriptions.add(this.yourService.move$.subscribe(direction => {
//Do something
}));
}
ngOnDestroy(): void {
this.subscriptions.unsubscribe();
}
关于angular - 将 Observable 数据从父组件传递到使用 Angular 2+ 中的 componentFactoryResolver 创建的子组件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46487255/