# Getting the Weather part One Geolocation

## Getting the Weather part One Geolocation

```javascript
const API_KEY = "키값 넣으주면됨 ";
const WEATHER_API = "https://api.openweathermap.org/data/2.5/weather?";

const weather = document.querySelector(".js-weather .weather__text");

function getWeather(coords) {
  fetch(
    `${WEATHER_API}lat=${coords.lat}&lon=${
      coords.lng
    }&appid=${API_KEY}&units=metric`
  )
    .then(response => response.json())
    .then(json => { // then을 사용한 이유는 fetch가 완료되길 기다려야하기때문이다. 
      const name = json.name;
      const temperature = json.main.temp;
      weather.innerHTML = `${Math.floor(temperature)}° @ ${name}`;
    });
}

function handleGeoSuccess(position) {
  const lat = position.coords.latitude;
  const lng = position.coords.longitude;
  const coords = {
    lat, // key 와 value값이 같으면 생략 가능하다.
    lng
  };
  localStorage.setItem("coords", JSON.stringify(coords));
  getWeather(coords);
}

function handleGeoFailure() {
  console.log("no location");
}

function loadWeather() {
  const currentCoords = localStorage.getItem("coords");
  if (currentCoords !== null) {
    const parsedCoords = JSON.parse(currentCoords);
    getWeather(parsedCoords);
    return;
  } else {
    navigator.geolocation.getCurrentPosition(
      handleGeoSuccess,
      handleGeoFailure
    );
  }
}

function init() {
  loadWeather();
}

init();
```

### API

**API는 특정 웹사이트로부터 데이터를 얻거나 컴퓨터끼리 소통하기 위해 고안된것이다.**


---

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