这是我的文件userdata.service.ts:
import { Injectable } from '@angular/core';
import { Http, Response } from '@angular/http';
import {Observable} from 'rxjs';
import { map } from "rxjs/operators";
import { catchError } from 'rxjs/operators';
import { Data } from './userdata';
@Injectable()
export class UserDataService {
url : "http://localhost:4200/assets/data/userdata.json";
constructor(private http:Http) { }
getDataWithObservable() : Observable<any>{
return this.http.get(this.url)
.pipe(
map(this.extractData),
catchError(this.handleErrorObservable)
);
}
private extractData(res: Response)
{
let body = res.json();
return body;
}
private handleErrorObservable (error: Response | any)
{
return Observable.throw(error.message || error);
}
}
我收到以下错误:
TypeError:rxjs__WEBPACK_IMPORTED_MODULE_2 __。Observable.throw不是 功能
答案 0 :(得分:14)
导入:
import { throwError } from 'rxjs';
用法:
return throwError(err);
答案 1 :(得分:2)
Observable.throw()
has been deleted.
尝试使用Observable.throwError()
。显然,这些定义尚未更新。
您可以使用import { throwError } from 'rxjs';
答案 2 :(得分:0)
在Angular 8中使用
throwError(new NotFoundError("Resource Not Found."))
不使用
Observable.throw(new NotFoundError("Resource Not Found."))
完整示例
catchError((错误:响应)=> {
if(error.status === 404){
return throwError(new NotFoundError("Resource Not Found."));
}
return throwError(new AppError(error))
})