在我的错误处理程序中,当我遇到错误时,我正试图导航到另一个页面。
我尝试获取项目列表如果失败我想导航到“./error 401”。我一直试图这样做:
UserTablecomponent:
export class UserDataSource extends DataSource<any>{
constructor(private authservice: AuthService) {
super();
}
connect(): any {
return this.authservice.GetInstallation();
}
disconnect() { }
}
这个电话可能有点奇怪。它的作用是打电话给其他人看看我有什么ID基于令牌。然后在下次通话中使用ID
auth.service
GetServiceProviderId(): Observable<Info> {
return this.http.get<Info>(this.rooturl + 'info', { headers: this.reqHeader });
}
GetInstallation(): Observable<Installation[]> {
return this.GetServiceProviderId().pipe(
flatMap(info => {
return this.http.get<Installation[]>
(this.rooturl +
"installation/?serviceproviderid=" +
info.ServiceProviderId,
{ headers: this.reqHeader })
}
), catchError(this.myerrorhandle.handleError))
}
}
myerrorHandle
@Injectable({
providedIn: 'root'
})
export class myerrorHandle {
constructor(public router: Router) { }
handleError(errorResponse: HttpErrorResponse) {
switch (errorResponse.status) {
case 401: {
this.router.navigate(["./error401"])
break;
}
default: {
console.log("todo");
break;
}
}
return throwError('an error was thrown');
}
}
这是我想要导航到“./error 401”的地方,但是得到了
错误错误类型错误:无法读取未定义的属性“导航”
这是完整的错误日志:
错误TypeError:无法读取CatchSubscriber.push上的未定义属性'navigate'.. / src / app / myerrorHandle.ts.myerrorHandle.handleError [as selector](myerrorHandle.ts:18)在CatchSubscriber.push ../ node_modules / rxjs MergeMapSubscriber.push上的/_esm5/internal/operators/catchError.js.CatchSubscriber.error(catchError.js:33)../ node_modules / rxjs / _esm5 / internal / Subscriber.js.Subscriber._error(Subscriber.js:80)在MergeMapSubscriber.push ../ node_modules / rxjs / _esm5 / internal / Subscriber.js.Subscriber.error(Subscriber.js:60)at MapSubscriber.push ../ node_modules / rxjs / _esm5 / internal / Subscriber.js.Subscriber。 _sror(Subscriber.js:80)在FilterSubscriber.push ../ node_modules / rxjs / _esm5 / internal / Subscriber.js.Subscriber.error(Subscriber.js:60)在FilterSubscriber.push ../ node_modules / rxjs / _esm5 /在MergeMapSubscriber.push的FilterSubscriber.push ../ node_modules / rxjs / _esm5 / internal / Subscriber.js.Subscriber.error(Subscriber.js:60)中的internal / Subscriber.js.Subscriber._error(Subscriber.js:80)。 ./node_module在InnerSubscriber.push上的s / rxjs / _esm5 / internal / OuterSubscriber.js.OuterSubscriber.notifyError(OuterSubscriber.js:13)../ node_modules / rxjs / _esm5 / internal / InnerSubscriber.js.InnerSubscriber._error(InnerSubscriber.js:18 )
正如@ user184994所说:
将catchError更改为catchError((错误)=> this.myerrorhandle.handleError(错误)))否则(没有箭头函数)将丢失此上下文
您需要在代码中使用箭头函数才能使用类上下文this
catchError(() => this.myerrorhandle.handleError));