我试图访问Json对象,我正在获取数据。但它显示错误。我怎样才能获得的数据没有任何错误对象http请求中的角JSON对象
ERROR TypeError: Cannot read property 'DATA' of undefined
at Object.View_DosminusComponent_0._co [as updateDirectives] (DosminusComponent.html:3)
at Object.debugUpdateDirectives [as updateDirectives] (core.es5.js:13075)
at checkAndUpdateView (core.es5.js:12255)
at callViewAction (core.es5.js:12620)
at execComponentViewsAction (core.es5.js:12552)
at checkAndUpdateView (core.es5.js:12261)
at callViewAction (core.es5.js:12620)
at execComponentViewsAction (core.es5.js:12552)
at checkAndUpdateView (core.es5.js:12261)
at callWithDebugContext (core.es5.js:13475)
// Component
import { DosminusService } from './../services/dosminus.service';
import { Component, OnInit } from '@angular/core';
@Component({
selector: 'app-dosminus',
templateUrl: './dosminus.component.html',
styleUrls: ['./dosminus.component.css']
})
export class DosminusComponent implements OnInit {
dosMinusData: any;
constructor(private dosminusService: DosminusService) {
}
ngOnInit() {
this.dosminusService.getDosMinusRecords()
.subscribe(response => {
this.dosMinusData = response.json();
})
}
}
//Service
import { Injectable } from '@angular/core';
import { Http } from '@angular/http';
@Injectable()
export class DosminusService {
constructor(private http: Http) {
}
getDosMinusRecords(){
return this.http.get('assets/Jsondata/dosminus.json');
}
}
//JSON
{
"DATA":{
"kpiValue":"10",
"kpiColor":"#A21313"
}
}
<div class="e2e-dosminus">
<div class="dosminus-center">
<div class="dosminus-number-circle" [ngStyle]="{'backgroundColor': dosMinusData.DATA.kpiColor}">
{{ dosMinusData.DATA.kpiValue }}
</div>
</div>
<h4> Dos(-) </h4>
</div>
参见教程,https://stackoverflow.com/q/39755336/3001761和几十比猫王运营商,如果你问我更清洁其他“无法读取属性[不管]未定义”的问题。 – jonrsharpe
{{dosMinusData?.DATA.kpiValue}} –
[Angular2:无法读取未定义的属性'name']的可能重复(https://stackoverflow.com/questions/39755336/angular2-cannot-read-property-name-未定义) – Alex