试图区分'[object Object]'的Angular4错误

Question

我正在尝试在 dom 中显示一些信息，但出现此错误：

Error: Error trying to diff '[object Object]'

我想做的是迭代来自 https://www.surbtc.com/api/v2/markets/btc-clp/ticker:

的数据

{"ticker":{"last_price":["1771455.0","CLP"],"min_ask":["1771432.0","CLP"],"max_bid":["1660003.0","CLP"],"volume":["178.37375119","BTC"],"price_variation_24h":"-0.107","price_variation_7d":"-0.115"}}

我想在html中这样显示：

<div *ngFor="let price of prices">
    {{price.min_ask}}
    </div>

这是 service.ts:

import { Injectable } from '@angular/core';
import { Http, Headers, Response } from '@angular/http';
import 'rxjs/add/operator/toPromise';
import {Observable} from "rxjs";
import 'rxjs/Rx';
import 'rxjs/add/operator/catch';
import { SurbtcMarket } from './surbtcmarket'


@Injectable()
export class SurbtcService {

  constructor(private http: Http, private surBtcMarket : SurbtcMarket) { }

  public getPricess() :Observable<SurbtcMarket> {
    return this.http.get('https://www.surbtc.com/api/v2/markets/btc-clp/ticker')
    .map((response: Response) => response.json());
  }

}

界面surbtcmarket.ts

export class SurbtcMarket {
public ticker: SurbtcMarketView[];
}

export class SurbtcMarketView {
  public last_price : number;
  public min_ask : number;
  public max_bid : number;
  public volume : number;
  public price_variation_24h : number;
  public price_variation_7d : number;
}

component.ts

import { Http, Response, Headers } from '@angular/http';
import { SurbtcService } from '../../surbtc/surbtc.service';
import {Observable} from "rxjs";

@Component({
  selector: 'app-comprarltc',
  templateUrl: './comprarltc.component.html',
  styleUrls: ['./comprarltc.component.scss']
})
export class ComprarltcComponent implements OnInit {

  private prices = [];

  constructor(private surbtcService: SurbtcService) {
    this.surbtcService = surbtcService;
  }

ngOnInit(){
  this.surbtcService.getPricess()
  .subscribe(
    data => this.prices = data.ticker
  );
}
}

Answer 1

public getPricess() :Observable<SurbtcMarket> { return this.http.get('https://www.surbtc.com/api/v2/markets/btc-clp/ticker') .map((response: Response) => response.json() as SurbtcMarket); }

这可能是因为它没有映射到类型。我假设这只会重新调整一个对象，否则你必须 return 一个数组。

public getPricess() :Observable<SurbtcMarket[]> { return this.http.get('https://www.surbtc.com/api/v2/markets/btc-clp/ticker') .map((response: Response) => response.json() as SurbtcMarket[]); }

Answer 2

如果您想要 price 作为数组，那么您在 prices 数组中有 push 对象。

ngOnInit(){
  this.surbtcService.getPricess()
  .subscribe(
    data => this.prices.push(data.ticker);
  );
}

或者，您可以通过将 data.ticker 分配给 prices 来直接访问对象属性。

private prices = new SurbtcMarketView();

constructor(private surbtcService: SurbtcService) {

}
ngOnInit(){
   this.surbtcService.getPricess()
        .subscribe(data =>{
            this.prices = data.ticker;
        });
}

HTML:

<div *ngFor="let item of prices.min_ask">
  {{item}}
</div>

更新：

查看 Plnkr demo，我已经解决了导致解析 json 响应错误的问题。

Answer 3

否则你也可以使用这个，

prices : SurbtcService[] = [];

然后你可以推送用户对象并制作成数组，

this.prices.push(<<the data you want to push>>);

试图区分'[object Object]'的Angular4错误

Angular4 Error trying to diff '[object Object]'

service

http

bitcoin

angular