I have a model:
export class CoreGoalModel {
constructor(
public title: string,
public image: string,
){}
}
My service:
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 || { };
}
And then in my component:
ngOnInit() {
this.homeService.getGoals()
.subscribe(
goals => this.coreGoals = goals,
error => this.errorMessage = <any>error);
}
I then am binding this in my template as:
<ul>
<li *ngFor="let goal of coreGoals">
{{goal.title}}
</li>
</ul>
My actual response from server:
[{"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"}]}]
This throws me error Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays.
What am I doing wrong? I simply would like to iterate over coreGoals properties and also access it's children and their properties.
Your error is here:
private extractData(res: Response) {
let body = res.json();
return body.data || { }; // error
}
Your response has no object named data, so remove data and it should work:
private extractData(res: Response) {
let body = res.json();
return body || { }; // here
}