我是angular2的新手,我的目标是显示从休息服务返回的Json数据,在我的模板中,下面是来自休息服务的Json数据.
{ “wellList”:[{ “国家”: “IDN”, “良好”: “测试”, “井眼”: “N”, “公司”: “测试”, “活性”: “N”},{”国家 “:” IDN “ ”好“: ”测试“, ”井“: ”N“, ”公司“: ”测试“, ”主动“: ”Y“},{ ”国“: ”IDN“,”好 “:” 测试 “ ”井“: ”N“, ”公司“: ”测试“, ”主动“: ”Y“},{ ”国“: ”IDN“, ”好“: ”测试“,”井眼 “:” N “ ”公司“: ”测试“, ”主动“: ”Y“},{ ”国“: ”IDN“, ”好“: ”测试“, ”井“: ”N“,”公司 “:” 测试”, “主动”: “Y”}]}
以下是我在模板中编写的代码:
<ul>
<li *ngFor="let well of wells | async">
<table>
<tr>
<th scope="col">Active</th>
<th scope="col">Company</th>
<th scope="col">Country</th>
<th scope="col">Well</th>
<th scope="col">Wellbore Indicator</th>
</tr>
<tr>
<td>{{well.active}}</td>
<td>{{well.company}}</td>
<td>{{well.country}}</td>
<td>{{well.well}}</td>
<td>{{well.wellbore}}</td>
</tr>
</table>
</li>
</ul>
但是,没有运气它不起作用,给出以下两个错误:
ERROR错误:InvalidPipeArgument:”for pipe’AsyncPipe’
at invalidPipeArgumentError(common.es5.js:2610)
在AsyncPipe.webpackJsonp … / .. / .. / common / @angular / common.es5.js.AsyncPipe._selectStrategy(common.es5.js:2755)
at AsyncPipe.webpackJsonp … / .. / .. / common /@angular/common.es5.js.AsyncPipe._subscribe(common.es5.js:2741)
at AsyncPipe.webpackJsonp … / .. / .. / common /@angular/common.es5.js.AsyncPipe
错误TypeError:无法读取null的属性’dispose’
在AsyncPipe.webpackJsonp … / .. / .. / common/@angular/common.es5.js.AsyncPipe._dispose(common.es5.js:2761)
在AsyncPipe.webpackJsonp … / .. / .. / common/@angular/common.es5.js.AsyncPipe.transform(common.es5.js:2725)
任何人都可以帮我解决这个问题
零件:
import { Component, OnInit } from '@angular/core';
import { UserService } from '../services/user.service';
import { User } from '../user/user';
import { Observable } from 'rxjs/Rx';
@Component({
selector: 'app-well',
templateUrl: './well.component.html',
styleUrls: ['./well.component.css'],
providers:[UserService]
})
export class WellComponent implements OnInit {
title = 'Wells';
wells: User[];
errorMessage: string;
constructor(private userService:UserService) {
this.wells = [];
}
ngOnInit() {
let self = this;
self.userService.getWells().subscribe(response => this.wells = response, error => this.errorMessage = < any > error);
}
}
服务:
import { Injectable } from '@angular/core';
import { Http, Headers, RequestOptions, Response } from '@angular/http';
import { Observable,Subject } from 'rxjs/Rx';
import 'rxjs/add/operator/toPromise';
import { User } from '../user/user';
import 'rxjs/Rx';
@Injectable()
export class UserService {
//private jsonFileURL: string='/assets/wells.json';
constructor(private http:Http) { }
getWells(): Observable < User[] > {
return this.http.get('http://localhost:8080/RESTfulExample/rest/auth/testuser1/pass',{headers:this.getHeaders()}).map((response: Response) => {
return <User[] > response.json();
}).catch(this.handleError);
}
//
private handleError(errorResponse: Response) {
console.log(errorResponse.statusText);
return Observable.throw(errorResponse.json().error || "Server error");
}
private getHeaders(){
// I included these headers because otherwise FireFox
// will request text/html instead of application/json
let headers = new Headers();
headers.append('Accept', 'application/json');
return headers;
}
}
最佳答案 ERROR错误:InvalidPipeArgument:”对于管道’AsyncPipe’,我认为你必须检查你是否已经将Asynce Pipe包含到app.module.ts ???中.因为这个错误是通知他们没有它们.而这个ERROR TypeError:无法读取null的属性’dispose’,是无法运行’AsyncPipe’后的日志.希望这可以帮助你修复