Library-Framework/React
[React] Unit Converter 만들기 (state 연습)
그랴
2022. 6. 30. 16:36
state를 바탕으로 UI를 변경할 수 있는 것은 매우 유용하다.
<!DOCTYPE html>
<html lang="en">
<body>
<div id="root"></div>
</body>
<!-- react -->
<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>
<script type="text/babel">
const root = document.getElementById("root");
function App() {
//state 설정
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();
setFlipped((current) => !current);
};
return (
<div>
<div>
<h1>Super Converter</h1>
<label htmlFor="minutes">Minutes</label>
<input
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"
onChange={onChange}
disabled={!flipped}
/>
</div>
<button onClick={reset}>Reset</button>
<button onClick={onFlip}>Flip</button>
</div>
);
}
ReactDOM.render(<App />, root);
</script>
</html>
https://nomadcoders.co/react-for-beginners/lectures/3273
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