2017-10-21 95 views
0

我正在嘗試使用開放天氣地圖api製作Angular 2中的天氣應用程序。我的應用程序中安裝了HttpModule,位於app.module.ts中。我也在app.component.ts中導入了Http,我正在運行該程序。無法訪問Angular 2中的JSON對象?

例如,我想獲取休斯頓天氣的json數據。我的代碼如下:

import { Component, OnInit } from '@angular/core'; 
import { Http } from '@angular/http' 

@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
    styleUrls: ['./app.component.css'] 
}) 


export class AppComponent implements OnInit { 
newdata; 

constructor (private http: Http) {} 

ngOnInit(): void{ 
    this.http.get('http://api.openweathermap.org/data/2.5/weather?q=houston&units=imperial&APPID=hiddenforstackoverflow').subscribe(data => { 
     this.newdata= data 
     }) 
} 

getData(){ 
    console.log(this.newdata) 
} 

但是,運行getData()函數後,控制檯並未真正顯示出我的預期。

headers:Headers {_headers: Map(1), _normalizedNames: Map(1)} 
ok:true 
status:200 
statusText:"OK" 
type:2 
url:"http://api.openweathermap.org/data/2.5/weather?q=houston&units=imperial&APPID=d3758344ecd26680d1ae2845dcfbbaf7" 
_body:"{"coord":{"lon":-95.36,"lat":29.76},"weather":[{"id":803,"main":"Clouds","description":"broken clouds","icon":"04n"}],"base":"stations","main":{"temp":74.17,"pressure":1014,"humidity":83,"temp_min":73.4,"temp_max":75.2},"visibility":16093,"wind":{"speed":5.82},"clouds":{"all":75},"dt":1508550780,"sys":{"type":1,"id":2638,"message":0.1571,"country":"US","sunrise":1508588841,"sunset":1508629448},"id":4699066,"name":"Houston","cod":200}" 
__proto__:Body 

我需要訪問內部_body(如座標,溫度等)的參數但是,使用data._body不起作用。 我是Angular的新手,習慣於在香草javascript中調用API,我使用ajax方法。

回答

1

Http服務不會嘗試猜測內容類型,因此你必須調用.json()您的迴應:

this.http.get('http://api.openweathermap.org/data/2.5/weather?q=houston&units=imperial&APPID=hiddenforstackoverflow').subscribe(data => { 
    this.newdata= data.json(); 
}) 

與同時不再需要新的HttpClient服務。