我正在角度5中使用auth guard来检查用户是否应该能够导航到特定页面 . 我收到一个与返回observable相关的错误:
A function whose declared type is neither 'void' nor 'any' must return a value.
这是我的authguard.ts
从'@ angular / core'导入;从'@ angular / router'导入{Router,CanActivate,ActivatedRoute,ActivatedRouteSnapshot,RouterStateSnapshot};从'../../service/application-verification.service'导入;
@Injectable() export class AppStatusGuard implements CanActivate {
applicationId: number; personId: number;
constructor(
public router: Router,
public readonly activeRoute: ActivatedRoute,
public readonly applicationVerificationService: ApplicationVerificationService) { }
loginRoute: boolean; memberRoute: boolean;
canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
this.applicationId = Number(route.params["applicationId"]);
this.personId = Number(route.params["personId"]);
// Make sure they are allowed on this page, if not re-direct
const url = this.applicationVerificationService.getRouteForFellowshipApplicant(this.personId, this.applicationId)
.subscribe((res: string) => {
console.log(url);
if (res !== `application-status/${this.personId}/${this.applicationId}`) {
console.log("failure");
// this.router.navigateByUrl(url);
return false;
} else {
console.log("success");
//this.router.navigateByUrl(url);
return true;
}
});
};
};
这是我的验证服务
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Router } from '@angular/router';
import 'rxjs/Rx';
import { Observable } from 'rxjs/Observable';
@Injectable()
export class ApplicationVerificationService {
constructor(
private readonly httpClient: HttpClient,
private readonly router: Router) { }
getRouteForFellowshipApplicant(personId, applicationId): Observable<string> {
this.httpClient.get('api/application-verification/' + personId).subscribe((responseObject: IFellowshipApplicationStatus) => {
return Observable.create(observer => {
if (responseObject.preApplicationVerificationStatus === 'GoToTrackerPage') {
observer.next('application-status/' + personId + '/' + applicationId);
}
if (responseObject.preApplicationVerificationStatus === 'GoToApplicationFormPage') {
observer.next('application-form/' + personId + '/' + applicationId);
}
if (responseObject.preApplicationVerificationStatus === 'GoToContactIceForInfoPage') {
observer.next('contact-us/' + personId + '/' + applicationId);
}
if (responseObject.preApplicationVerificationStatus === 'GenericError') {
observer.next('application-error/' + personId);
}
observer.complete();
});
});
return null;
}
}
我是rxjs的新手,我认为我在回复可观察性方面犯了一个错误,但我有点挣扎 . 任何帮助,将不胜感激 .
2 回答
这将解决您的问题 .
您的问题是您没有返回任何内容,而您正在订阅您的HTTP呼叫 . 相反,返回Observable本身,并使用
pipe(map(...))
在HTTP调用之后执行操作,而不会中断像subscribe
这样的操作链 .如果你看一下CanActivate方法,它的返回类型是boolean,它应该是Observable . 而且,如果需要,您可以使用.map并返回Observable而不是subscribe .
希望这可以帮助 . 谢谢 .