ReactJS

[ReactJS] 리액트로 분/시간, Km/Miles 변환기 만들기

youjeong_choi 2022. 10. 5. 22:34

HTML 코드

<!DOCTYPE html>
<html lang="en">
  <head></head>
  <body>
    <div id="root"></div>

    <script src="https://unpkg.com/react@17.0.2/umd/react.production.min.js"></script>
    <script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.production.min.js"></script>
    <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>

  </body>
</html>

아래는 리액트 코드

      <script type="text/babel">
      function MinutesToHours() {
        const [amount, setAmount] = React.useState(0);
        const [flipped, setFlipped] = React.useState(false);
        const onChange = (event) => {
          setAmount(event.target.value);
        };
        const reset = () => setAmount(0);
        const onFlip = () => {
          reset();
          // 현재의 값을 반대로 바꿔줌
          setFlipped((current) => !current);
        };
        return (
          <div>
            <div>
              <label htmlFor="minutes">Minutes</label>
              <input
                // 외부에서도 input의 값을 수정해주기위해 이렇게 연결함. ex) reset
                value={flipped ? amount * 60 : amount}
                id="minutes"
                placeholder="Minutes"
                type="number"
                onChange={onChange}
                disabled={flipped}
              />
            </div>
            <div>
              <label htmlFor="hours">Hours</label>
              <input
                value={flipped ? amount : Math.round(amount / 60)}
                id="hours"
                placeholder="Hours"
                type="number"
                disabled={!flipped}
                onChange={onChange}
              />
            </div>
            <button onClick={reset}>Reset</button>
            <button onClick={onFlip}>{flipped ? "Turn back" : "Invert"}</button>
          </div>
        );
      }
      
      function KmToMiles() {
        const [amount, setAmount] = React.useState(0);
        const [flipped, setFlipped] = React.useState(false);
        const onChange = (event) => {
          setAmount(event.target.value);
        };
        const reset = () => setAmount(0);
        const onFlip = () => {
          reset();
          // 현재의 값을 반대로 바꿔줌
          setFlipped((current) => !current);
        };
        return (
          <div>
            <div>
              <label htmlFor="km">Km</label>
              <input
                // 외부에서도 input의 값을 수정해주기위해 이렇게 연결함. ex) reset
                value={flipped ? amount / 1000 : amount}
                id="km"
                placeholder="km"
                type="number"
                onChange={onChange}
                disabled={flipped}
              />
            </div>
            <div>
              <label htmlFor="miles">Miles</label>
              <input
                value={flipped ? amount : amount * 1000}
                id="miles"
                placeholder="miles"
                type="number"
                disabled={!flipped}
                onChange={onChange}
              />
            </div>
            <button onClick={reset}>Reset</button>
            <button onClick={onFlip}>{flipped ? "Turn back" : "Invert"}</button>
          </div>
        );
      }

      function App() {
        const [index, setIndex] = React.useState();
        const onSelect = (event) => {
          setIndex(event.target.value);
        };
        return (
          <div>
            <h1>Super Converter</h1>
            <select value={index} onChange={onSelect}>
              <option value="xx">Select your units</option>
              <option value="0">Minutes & Hours</option>
              <option value="1">Km & Miles</option>
            </select>
            {index === "xx" ? "Please select your units" : null}
            {index === "0" ? <MinutesToHours /> : null}
            {index === "1" ? <KmToMiles /> : null}
          </div>
        );
      }
      const root = document.getElementById("root");
      ReactDOM.render(<App />, root);
      </script>