這個問題是給了我一個巨大的頭痛所以任何幫助都是歡迎的。渲染嵌套對象狀態
在這個部分,我做2個Axios公司調用不同的API:一個用於freegeoip,一個用於openweathermap。我將數據存儲在currentCity
狀態,這是一個帶有2個密鑰的對象,location
和weather
。這個想法是,應用程序檢測您的當前位置(使用freegeoip)並呈現位置名稱和天氣數據(使用openweathermap)。
我很積極,它正在控制檯日誌已確認正確存儲狀態。我可以呈現currentCity狀態的位置數據,但似乎無法呈現currentCity狀態的天氣數據。
renderCurrentCity(city) {
console.log('state3:', this.state.currentCity);
console.log([city.weather.main]);
return(
<div>
<li>{city.location.city}, {city.location.country_name}</li> // Working
<li>{city.weather.main.temp}</li> // Not working
</div>
)
}
控制檯的錯誤,我得到:
Uncaught (in promise) TypeError: Cannot read property '_currentElement' of null
currentCity.location JSON:
{
"ip": // hidden,
"country_code": "FR",
"country_name": "France",
"region_code": "GES",
"region_name": "Grand-Est",
"city": "Reims",
"zip_code": "",
"time_zone": "Europe/Paris",
"latitude": 49.25,
"longitude": 4.0333,
"metro_code": 0
}
currentCity.weather JSON:
{
"coord": {
"lon": 4.03,
"lat": 49.25
},
"weather": [
{
"id": 800,
"main": "Clear",
"description": "clear sky",
"icon": "01d"
}
],
"base": "stations",
"main": {
"temp": 283.15,
"pressure": 1011,
"humidity": 43,
"temp_min": 283.15,
"temp_max": 283.15
},
"visibility": 10000,
"wind": {
"speed": 3.1,
"deg": 350
},
"clouds": {
"all": 0
},
"dt": 1493127000,
"sys": {
"type": 1,
"id": 5604,
"message": 0.1534,
"country": "FR",
"sunrise": 1493094714,
"sunset": 1493146351
},
"id": 2984114,
"name": "Reims",
"cod": 200
}
休息的代碼:
import React, { Component } from 'react';
import axios from 'axios';
import WeatherList from './weatherlist';
import SearchBar from './searchbar';
const API_KEY = '95108d63b7f0cf597d80c6d17c8010e0';
const ROOT_URL = 'http://api.openweathermap.org/data/2.5/weather?'
export default class App extends Component {
constructor(props) {
super(props);
this.state = {
cities: [],
errors: '',
currentCity: {
location: {},
weather: {}
}
};
this.currentCity();
this.renderCurrentCity = this.renderCurrentCity.bind(this);
}
citySearch(city) {
const url = `${ROOT_URL}&appid=${API_KEY}&q=${city}`;
axios.get(url)
.then(response => {
const citiesArr = this.state.cities.slice();
this.setState({
cities: [response.data, ...citiesArr],
errors: null
});
})
.catch(error => {
this.setState({
errors: 'City not found'
})
})
}
currentCity() {
var city;
var country;
axios.get('http://freegeoip.net/json/')
.then(response => {
const lat = response.data.latitude;
const lon = response.data.longitude;
city = response.data.city;
country = response.data.country_name;
const url = `${ROOT_URL}&appid=${API_KEY}&lat=${lat}&lon=${lon}`;
const state = this.state.currentCity;
console.log('state1:',state);
this.setState({
currentCity: { ...state, location: response.data }
});
console.log(url);
axios.get(url)
.then(city => {
const state = this.state.currentCity;
console.log('state2:', state);
this.setState({
currentCity: { ...state, weather: city.data }
});
})
})
}
renderCurrentCity(city) {
console.log('state3:', this.state.currentCity);
console.log([city.weather.main]);
return(
<div>
<li>{city.location.city}, {city.location.country_name}</li>
<li>{city.weather.main.temp}</li>
</div>
)
}
render() {
return (
<div className={this.state.cities == false ? 'search': 'search-up'}>
<h1>What's the weather today?</h1>
<ul className='list-unstyled text-center'>
{this.renderCurrentCity(this.state.currentCity)}
</ul>
<SearchBar
onSearchSubmit={this.citySearch.bind(this)}
errors={this.state.errors} />
{this.state.cities == false ? null : <WeatherList cities={this.state.cities} />}
</div>
)
}
}
請分享從'輸出的console.log renderCurrentCity' – thedude
如何我是否這樣做?我只能得到整個控制檯輸出 – doctopus