React/ 실습 - (실습) 비동기 제어하기

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App.js

import logo from './logo.svg';
import './App.css';
import WeatherBox from './components/WeatherBox';
import WeatherButton from './components/WeatherButton';
import 'bootstrap/dist/css/bootstrap.min.css';
import { Container } from 'react-bootstrap';
import React, { useState, useEffect } from 'react';
import {ClipLoader} from 'react-spinners';

const API_KEY = '7e46173fe62df8971b27ba7ffdebef80';
const cities = ['paris', 'new york', 'tokyo', 'seoul'];

const App = () => {
  const [city, setCity] = useState(null);
  const [weather, setWeather] = useState(null);
  const [loading, setLoading] = useState(false);

  const getWeatherByCurrentLocation = async (lat, lon) => {
    try {
      let url =
        //`https://api.openweathermap.org/data/2.5/weather?lat=${lat}&lon=${lon}&appid=${API_KEY}`;
        // `https://api.openweathermap.org/data/2.5/weather?q=${city}&appid=${API_KEY}`;
      'http://api.openweathermap.org/data/2.5/weather?lat=35.87222&lon=128.60250&appid=7e46173fe62df8971b27ba7ffdebef80';
      const res = await fetch(url);
      const data = await res.json();
      setWeather(data);
      setLoading(false);
    } catch (err) {
      console.log(err.message);
      setLoading(false);
    }
  };

  const getCurrentLocation= () => {
    navigator.geolocation.getCurrentPosition((position) => {
      const { latitude, longitude } = position.coords;
      getWeatherByCurrentLocation(latitude, longitude);
      console.log('현재위치?', latitude, longitude);
    });
  };

  const getWeatherByCity = async () => {
    try {
      let url = `https://api.openweathermap.org/data/2.5/weather?q=${city}&appid=${API_KEY}`;
      const res = await fetch(url);
      const data = await res.json();
      setWeather(data);
      setLoading(false);
    } catch (err) {
      console.log(err);
      setLoading(false);
    }
  };

  useEffect(() => {
    if (city == null) {
      setLoading(true);
      getCurrentLocation();
    } else {
      setLoading(true);
      getWeatherByCity();
    }
  }, [city]);

  const handleCityChange = (city) => {
    if (city === 'current') {
      setCity(null);
    } else {
      setCity(city);
    }
  };

  return (
    <>
      <Container className="vh-100">
        <div></div>
        <div className="main-container">
          <WeatherBox weather={weather} />
          <WeatherButton
            cities={cities}
            handleCityChange={handleCityChange}
            selectedCity={city}
          />
        </div>
      </Container>
    </>
  );
};

export default App;

Weatherbox.js

import React from 'react';
import { Card } from 'react-bootstrap';

const WeatherBox = ({ weather }) => {
  const temperatureC =
    weather && weather.main ? (weather.main.temp - 273.15).toFixed(2) : '';
  const temperatureF =
    weather && weather.main
      ? (((weather.main.temp - 273.15) * 9) / 5 + 32).toFixed(2)
      : '';
  return (
    <Card className="weather-card">
      <Card.ImgOverlay className="d-flex flex-column justify-content-center text-center">
        <Card.Title>{weather?.name}</Card.Title>
        <Card.Text className="text-success h1">
          {`${temperatureC} °C / ${temperatureF} °F`}
        </Card.Text>
        <Card.Text className="text-info text-uppercase h2">
          {weather && weather.weather[0]?.description}
        </Card.Text>
      </Card.ImgOverlay>
    </Card>
  );
};

export default WeatherBox;

WeatherButton.js

import React from 'react';
import { Button } from 'react-bootstrap';

const WeatherButton = ({ cities, selectedCity, handleCityChange }) => {
  return (
    <div class="menu-container">
      <Button
        variant={`${selectedCity === null ? 'outline-warning' : 'warning'}`}
        onClick={() => handleCityChange('current')}
      >
        Current Location
      </Button>

      {cities.map((city) => (
        <Button
          variant={`${selectedCity === city ? 'outline-warning' : 'warning'}`}
          onClick={() => handleCityChange(city)}
        >
          {city}
        </Button>
      ))}
    </div>
  );
};

export default WeatherButton;

PublicNavbar.js

import React from 'react';
import { Navbar, Nav } from 'react-bootstrap';

const PublicNavbar = () => {
  return (
    <Navbar bg="light" expand="lg" className="position-fixed navbar-fixed">
      <Navbar.Brand></Navbar.Brand>
      <Nav className="mr-auto"></Nav>
      <Nav>
        <a
          href="https://github.com/dhminh1024/cs_weather_app"
          target="_blank"
          rel="noreferrer"
        ></a>
      </Nav>
    </Navbar>
  );
};

export default PublicNavbar;

App.css

body {
  background: url(https://images.unsplash.com/photo-1592210454359-9043f067919b?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=870&q=80);
  background-repeat: no-repeat;
  background-size: cover;
}

.weather-card{
  background-color: rgba(52,52,52,.7);
  padding: 50px;
  border: 2px solid #fff;
  border-radius: 20px;
  max-width: 700px;
  width:100%;
  height: 300px;
}
.main-container{
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  
}
.menu-container{
  display: flex;
  justify-content: center;
  background-color: #000;
  border-radius: 60px;
  max-width: 700px;
  width:100%;
  padding: 30px;
  margin-top: 30px;

}
.menu-container Button{
  margin-right:30px;
}

.menu-container Button:hover{
  background-color: #ffc107;
}

결과물

느낀점

이번 한달동안 배운 Java와 관련된 사항들을 다 사용해본듯하다. 좀 더 실습해보고 프로젝트를 진행해 봐도 좋을듯하다.