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我正在嘗試構建一個簡單的頭文件組件,它現在只是試圖打印在其內部使用Subscriber方法註冊的導航的ID NavService。 NavService註冊Nav並調用BehaviorSubject上的下一個方法。但是該值不會傳輸到標題組件。我得到的只是BehaviorSubject的初始值。你能告訴我我做錯了嗎?Angular 2 + RxJS BehaviorSubject訂閱調用不工作
標題組件:
@Component({
selector: 'my-custom-header',
template: `
<div class="container">
This is a header
<nav custom-nav-1>Custom Nav 1</nav>
<ng-content></ng-content>
<div>Number of Nav Registered: {{noOfNav}}</div>
</div>
`,
styles: ['.container { border: 1px solid; }'],
providers: [NavService]
})
export class HeaderComponent {
title = 'Hello!';
noOfNav = 0;
constructor(private navService: NavService) {}
ngOnInit() {
this.navService._navSubject.subscribe({
next: (id) => {
this.noOfNav = id;
}
});
}
}
NavService:
@Injectable()
export class NavService {
public _navSubject: BehaviodSubject = new BehaviorSubject<number>(0);
registerNavId(id: number) {
this._navSubject.next(id);
}
}
導航指令:
@Component({
selector: '[custom-nav-1]',
providers: [NavService]
})
export class NavDirective {
constructor(private navService: NavService) {}
ngOnInit() {
this.navService.registerNavId(1);
}
}
普拉克:https://plnkr.co/edit/0XEg4rZqrL5RBll3IlPL?p=preview
非常感謝!這工作。 – takeradi
很高興我能幫忙:) –