【发布时间】:2018-09-27 03:43:13
【问题描述】:
我正在使用 Angular 5 服务调用 POST API
服务文件
import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders, HttpErrorResponse, HttpClientModule } from '@angular/common/http';
import { Http, Response } from '@angular/http';
import 'rxjs/add/operator/catch';
import 'rxjs/add/observable/throw';
import 'rxjs/add/operator/map';
import { Observable } from 'rxjs/Observable';
import { HttpResponse } from 'selenium-webdriver/http';
import { IScheduleAPI } from '../interfaces/ischeduleAPI';
// import { Ischedule } from '../interfaces/ischedule';
@Injectable()
export class SchedulesService {
apiURL = 'http://localhost:57863/api/Audit/';
ScheduleDetail: IScheduleAPI[] = [];
constructor(private http: Http) { }
GetScheduleAPI(params, httpOptions) {
return this.http.post<IScheduleAPI[]>(this.apiURL, params, httpOptions)
.catch(this.errorHandler);
}
errorHandler(error: HttpErrorResponse) {
return Observable.throw(error.message || 'Server Error');
}
}
我在我的组件中调用此服务
import { Component, OnInit } from '@angular/core';
import { HttpClientModule, HttpHeaders } from '@angular/common/http';
import { IScheduleAPI } from '../interfaces/ischeduleAPI';
import { SchedulesService } from '../services/schedules.service';
import { Http, Response } from '@angular/http';
@Component({
selector: 'app-schedules',
templateUrl: './schedules.component.html',
styleUrls: ['./schedules.component.css']
})
export class SchedulesComponent implements OnInit {
Schedule: IScheduleAPI[];
message: string;
constructor(private sch: SchedulesService, private http: Http) { }
ngOnInit() {
const params = [{
'ActionMethod': 'GetSchedule',
'StaffCode': 'NA',
'Password': 'NA'
}];
const httpOptions = {
headers: new HttpHeaders({
'Content-Type': 'application/json'
})
};
this.sch.GetScheduleAPI(params, httpOptions).subscribe(data => this.Schedule = data,
error => this.message = error);
}
}
现在的问题
1.] 显示错误,Expected 0 type arguments but got 1 in line
return this.http.post<IScheduleAPI[]>(this.apiURL, params, httpOptions)
它的内部服务文件,这是我从其他工作正常的服务文件中使用的标记。
删除 IScheduleAPI[] 后,它停止显示错误,但没有命中 API,而是显示错误
我正在使用 Angular 5
【问题讨论】:
-
您正在混合旧的 Http 和新的 HttpClient 模块
-
Http已弃用,请改用HttpClient -
只需将
constructor(private http: Http) { }替换为constructor(private http: HttpClient) { }。看起来您已经正确导入了 -
@David ,它使用 HttpClient 编译并点击 api 但它不等待 api 返回结果,在结果返回之前执行其他语句
-
@Jack : 返回前执行了哪些代码?你知道http请求是异步的吧?