我有一个模特:
export class CoreGoalModel { constructor( public title: string,public image: string,){} }
我的服务:
getGoals(): Observable<CoreGoalModel[]> { let headers = new Headers({ 'Access-Control-Allow-Origin': '*' }); let options = new RequestOptions({ headers: headers }); return this.http.get(this.base_url + 'coregoal',options) .map(this.extractData) .catch(this.handleError); } private extractData(res: Response) { let body = res.json(); return body.data || { }; }
然后在我的组件中:
ngOnInit() { this.homeService.getGoals() .subscribe( goals => this.coreGoals = goals,error => this.errorMessage = <any>error); }
然后我在我的模板中将其绑定为:
<ul> <li *ngFor="let goal of coreGoals"> {{goal.title}} </li> </ul>
我从服务器的实际响应:
[{"coreGoalId":1,"title":"Core goal 1","infrastructure":"Sample Infrastructure","audience":"People","subGoals":null,"benefits":[{"benefitId":1,"what":"string","coreGoalId":1}],"effects":null,"steps":null,"images":[{"imagelId":1,"base64":"/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcU\nFhYaHSUfGhsjHBYWICwgIyYnKSopGR8tMC0oMCUoKSj/2wBDAQcHBwoIChMKChMoGhYaKCgoKCgo\nKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCj/wgARCAIWAe4DASIA\nAhEBAxEB/8QAHAABAAIDAQEB"}]}]
这会引发我的错误无法找到’object’类型的不同支持对象'[object Object]’. NgFor仅支持绑定到诸如Arrays之类的Iterables.
我究竟做错了什么?我只想迭代coreGoals属性,并访问它的子项及其属性.
你的错误在这里:
private extractData(res: Response) { let body = res.json(); return body.data || { }; // error }
您的响应没有对象命名数据,因此删除数据它应该工作:
private extractData(res: Response) { let body = res.json(); return body || { }; // here }
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