请,我需要帮助来显示单个JSON对象属性 .
这是我的服务:
import {
Injectable
} from '@angular/core';
import {
Http,
HttpModule,
Headers,
RequestOptions,
Response
} from '@angular/http';
import { HttpClientModule } from '@angular/common/http';
import {
Observable
} from 'rxjs/Rx';
import 'rxjs/Rx'; //get everything from Rx
import 'rxjs/add/operator/toPromise';
import {
IProduct
} from "../models/iproduct";
@Injectable()
export class ProcessJsonService {
constructor(private http: Http) {}
//
getProcesslist() {
return this.http.request('http://www.json-generator.com/api/json/get/bVOdrzTUeq?indent=0')
.map(res => { console.log("I SEE DATA HERE: ", res.json())
return res.json(); })
}
}
我的component.ts文件:
import { Component, OnInit } from '@angular/core';
import { IProduct } from "../models/iproduct";
import {
Http
} from '@angular/http';
import {
ProcessJsonService
} from '../models/myjsonprocess';
import {
Observable
} from 'rxjs/Rx';
@Component({
selector: 'app-product-list',
templateUrl: './product-list.component.html',
styleUrls: ['./product-list.component.css']
})
export class ProductListComponent implements OnInit {
pageTitle: string = 'Process List';
imageWidth: number = 50;
imageMargin: number = 2;
showImage: boolean = false;
listFilter: string = '';
processList: IProduct[];
errorMessage: string;
constructor(private _processJsonService: ProcessJsonService) {
this.processList = [];
}
ngOnInit(): void {
this._processJsonService.getProcesslist()
.subscribe(
processList => this.processList = processList)
}
}
我的HTML代码:
<div class='panel panel-primary'>
<div class='panel-heading'>
{{pageTitle}}
</div>
<div class='panel-body'>
<div class='row'>
<div class='col-md-2'>Filter by:</div>
<div class='col-md-4'>
<input type='text' [(ngModel)]='listFilter' />
</div>
</div>
<div class='row'>
<div class='col-md-4'>
<h4>Filtered by: {{listFilter}} </h4>
</div>
</div>
<div class='table-responsive'>
<table class='table'
*ngIf='processList && processList.length'>
<thead>
<tr>
<th>Process Name</th>
<th>Process Instance</th>
<th>Process Status</th>
<th>Temp-acked Messages Number</th>
<th>Unprocessed Messages Number</th>
<th>Deferred Messages Number</th>
</tr>
</thead>
<tbody>
<tr *ngFor="let process of processlist | processFilter:listFilter" >
<td>{{ process.process_name }}</td>
<td>{{ process.instance }}</td>
<td>{{ process.status }}</td>
<td>{{ process.tempacked_cmsg}}</td>
<td>{{ process.unprocessed_cmsg}}</td>
<td>{{ process.deferred_cmsg}}</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
问题是我没有在浏览器上显示我的数据,但是如果URL包含JSON数组,则数据会显示在浏览器中 .
我在服务中添加了一个console.log来在控制台中显示res.json,我得到了它 . 我在组件中尝试了相同的(在ngOnInit中),但我没有在控制台中获取数据 . 这可能有助于找出问题所在 .
有什么帮助吗?
1 回答
你是说
getProcessList()
可以返回像[{...}, {...}, {...}]
这样的东西(如果只有一个进程)会返回{...}
吗?如果是这种情况,那么
ngFor
不会喜欢接收不是列表的东西,所以: