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);
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