我遇到一個觀察問題,無法觸發。Angular 2可觀察的訂閱不觸發
我使用看起來像這樣一邊導航佈局指令佈局:
<md-sidenav-layout class="nav-bar">
<md-sidenav #start>
<nav>
<a [routerLink]="['/home']">Home</a>
</nav>
<button md-button (click)="start.close()">Close</button>
</md-sidenav>
<router-outlet></router-outlet>
</md-sidenav-layout>
我需要做的是開放路由器出口正在顯示該組件的側導航。
一個這樣的組件可能是這樣的:
@Component({
providers: [SidenavService, MdIconRegistry],
directives: [MdIcon],
templateUrl: `<md-icon (click)="toggleSidenav()">menu</md-icon>`,
styleUrls: ["./home.component.scss"]
})
export class Home {
myColor: string;
constructor(private sidenavService: SidenavService) {
this.myColor = "primary";
this.sidenavService.getSidenavObs().subscribe(state => {console.log("state change")});
}
toggleSidenav() {
this.sidenavService.toggleSidenav("open");
}
}
我創建了返回可觀察到的這樣一種服務:
@Injectable()
export class SidenavService {
private toggle = new Subject<string>();
private toggleObs = this.toggle.asObservable();
getSidenavObs() {
return this.toggleObs;
}
toggleSidenav(state: string) {
this.toggle.next(state);
}
}
最後父類的代碼(即與所屬側導航佈局HTML):
@Component({
providers: [MdSidenav, SidenavService],
directives: [ROUTER_DIRECTIVES, MD_SIDENAV_DIRECTIVES, MD_BUTTON_DIRECTIVES],
selector: "app",
templateUrl: "app.html",
styleUrls: ["./app.scss"],
})
export class App {
subscription: Subscription;
constructor(private sidenavService: SidenavService, private sidenav: MdSidenav) {
this.subscription = sidenavService.getSidenavObs().subscribe(status => {
console.log("state change");
sidenav.open();
}, error => {
console.log(error);
},() => {
console.log("completed");
});
}
}
現在我的問題是訂閱但是,應用程序組件不會觸發Home組件中的訂閱(這是路由器插座顯示的內容)按預期觸發。
我在這裏錯過了什麼嗎?
我遵循這個指南:https://angular.io/docs/ts/latest/cookbook/component-communication.html#!#bidirectional-service
非常感謝!這解決了我的問題。 – mda144
謝謝Michael! – Leibniz
謝謝邁克爾!!你救了我 – bews99