Angular4 尝试区分“[object Object]"时出错 [英] Angular4 Error trying to diff '[object Object]'

问题描述

我正在尝试在 dom 中显示一些信息，但出现此错误:

<块引用>

错误:尝试区分[object Object]"时出错

我想做的是从 https 中迭代这些数据://www.surbtc.com/api/v2/markets/btc-clp/ticker:

<块引用>

{"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"}}

我想像这样在 html 中显示它:

{{price.min_ask}}

这是 service.ts:

import { Injectable } from '@angular/core';从@angular/http"导入 { Http, Headers, Response };导入 'rxjs/add/operator/toPromise';从rxjs"导入 {Observable}；导入'rxjs/Rx'；导入 'rxjs/add/operator/catch';从 './surbtcmarket' 导入 { SurbtcMarket }@Injectable()导出类 SurbtcService {构造函数(私有http:Http，私有surBtcMarket:SurbtcMarket){}public getPricess() :Observable{return this.http.get('https://www.surbtc.com/api/v2/markets/btc-clp/ticker').map((response: Response) => response.json());}}

界面surbtcmarket.ts

导出类 SurbtcMarket {公开代码: SurbtcMarketView[];}导出类 SurbtcMarketView {公共 last_price : 数字；公共 min_ask : 数字；公共最大出价:数字；公众号:数量；public price_variation_24h : 数字；public price_variation_7d :数字；}

component.ts

import { Http, Response, Headers } from '@angular/http';从'../../surbtc/surbtc.service'导入{ SurbtcService}；从rxjs"导入{Observable}；@零件({选择器:'app-comprarltc'，templateUrl: './comprarltc.component.html',styleUrls: ['./comprarltc.component.scss']})导出类 ComprarltcComponent 实现 OnInit {私人价格 = [];构造函数(私有 surbtcService:SurbtcService){this.surbtcService = surbtcService;}ngOnInit(){this.surbtcService.getPricess().订阅(数据 =>this.prices = data.ticker);}}

解决方案

如果你想把 price 作为一个数组，那么你有 push 在 中的对象>prices 数组.

ngOnInit(){this.surbtcService.getPricess().订阅(数据 =>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.

私有价格 = new SurbtcMarketView();构造函数(私有 surbtcService:SurbtcService){}ngOnInit(){this.surbtcService.getPricess().订阅(数据=>{this.prices = data.ticker;});}

HTML:

{{物品}}

更新:

查看 Plnkr 演示，我已经解决了导致错误的问题解析 json 响应.

I'm trying to display some info in the dom but I get this error:

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

What Im trying to do is iterate over this data from https://www.surbtc.com/api/v2/markets/btc-clp/ticker:

{"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"}}

I want to display it in the html like this:

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

this is the 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());
  }

}

Interface 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
  );
}
}

解决方案

If you want to have price as an array, then you have push the object in prices array.

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

OR, you can just directly access the object properties by assigning data.ticker to prices.

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>

UPDATE:

See the Plnkr demo, I have resolved the issue that was causing error in parsing the json response.

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