angular - 错误 : Http failure during parsing in Angular

Question

我正在学习 Angular，我想在 HTML 页面上显示 JSON 数据。错误是在 Angular 中解析期间的 Http 失败。我不知道为什么请告诉我我的错误并给我链接如何显示多种类型的 JSON 数据

person.component.html

<ul>

 <li *ngFor="let address of addresses">FirstName:{{ persons.addresses.City }}</li>
</ul>

人.json

[{
        "Addresses": [{ 

        "AddressId":101,
        "AddressTypes":["permanent", "temporary", "careof", "native"],
        "Address-L1":"space", 
        "Address-L2":"a.b.road",
        "Locality":"airoli(east)",
        "City":"Mumbai", 
        "State":"Maharashtra",
        "Country":"India",
        "Postalcode":400027
     }],

 "ContactNumbers" : 
[
    {

            "ContactID": 1,
            "ContactType": "Home",
            "CountryCode": "+91",
            "RegionCode": "022",
            "Number":2656568965

    }]    

}]

person-list.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';
// import 'rxjs/add/operator/do';  // for debugging

export class Address{
  AddressId:number;
  City:string=""; 

}
/**
 * This class provides the NameList service with methods to read names and add names.
 */
@Injectable()
export class PersonListService {

  /**
   * Creates a new NameListService with the injected HttpClient.
   * @param {HttpClient} http - The injected HttpClient.
   * @constructor
   */
  constructor(private http: HttpClient) {}

  /**
   * Returns an Observable for the HTTP GET request for the JSON resource.
   * @return {string[]} The Observable for the HTTP request.
   */

  get(): Observable<Address[]>{
    console.log("Inside the get service")
    return this.http.get('app/person/person.json')

                 // .do(data => console.log('server data:', data))  // debug
                    .catch(this.handleError);

  }

  /**
    * Handle HTTP error
    */
  private handleError (error: any) {
    // In a real world app, we might use a remote logging infrastructure
    // We'd also dig deeper into the error to get a better message
    const errMsg = (error.message) ? error.message :
      error.status ? `${error.status} - ${error.statusText}` : 'Server error';
    console.error(errMsg); // log to console instead
    return Observable.throw(errMsg);
  }
}

person.component.ts

@Component({
  moduleId: module.id,
  selector: 'sd-person',
  templateUrl: 'person.component.html',
  styleUrls: ['person.component.css']
})
export class PersonComponent implements OnInit {
  errorMessage: string;

addresses: Address[]=[];
constructor(public personListService:PersonListService){}
  ngOnInit() {
     // console.log(jwt.AuthConfig);
     this.getperson();
  }

  getperson(){

    this.personListService.get()
    .subscribe(
      addresses => this.addresses = addresses,
      error => this.errorMessage = <any>error
    );
    console.log(this.persons);
  }
 }

Answer 1

这在技术上是无效的 JSON，因为“孟买”之后有尾随逗号

应该是

[{"Addresses": [{ 
        "AddressId":101,
        "City":"Mumbai" 
         }]
}]

编辑

更新之后，那也是无效的，因为它需要被包裹在一个对象中，像这样:

{
    "Addresses": [{

        "AddressId": 101,
        "AddressTypes": ["permanent", "temporary", "careof", "native"],
        "Address-L1": "space",
        "Address-L2": "a.b.road",
        "Locality": "airoli(east)",
        "City": "Mumbai",
        "State":"Maharashtra",
        "Country": "India",
        "Postalcode": 400027
    }],

    "ContactNumbers": [{

        "ContactID": 1,
        "ContactType": "Home",
        "CountryCode": "+91",
        "RegionCode": "022",
        "Number": 2656568965

    }]

}

这将创建一个包含 2 个数组的对象:“Addresses”和“ContactNumbers”