index.html
<!DOCTYPE html>
<html>
<body>
<div id = "root"></div>
</body>
<script src="<https://unpkg.com/[email protected]/umd/react.production.min.js>"></script>
<script src="<https://unpkg.com/[email protected]/umd/react-dom.production.min.js>"></script>
<script src="<https://unpkg.com/@babel/standalone/babel.min.js>"></script>
<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();
setFlipped((current) => !current);
};
return (
<div>
<div>
<label htmlFor="minutes">Minutes</label>
<input
id="minutes"
value={flipped ? amount * 60 : amount}
placeholder="Minutes"
type="number"
onChange={onChange}
disabled={flipped}
/>
</div>
<div>
<label htmlFor="hours">Hours</label>
<input
id="hours"
value={flipped ? amount : Math.round(amount / 60)}
placeholder="Hours"
type="number"
onChange={onChange}
disabled={!flipped}
/>
</div>
<button onClick={reset}>Reset</button>
<button onClick={onFlip}>{flipped ? "minute -> hour" : "hour -> minute"}</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();
setFlipped((current) => !current);
};
return (
<div>
<div>
<label htmlFor="Km">Km</label>
<input
id="Km"
value={flipped ? amount / 0.62137 : amount}
placeholder="Km"
type="number"
onChange={onChange}
disabled={flipped}
/>
</div>
<div>
<label htmlFor="miles">Miles</label>
<input
id="miles"
value={flipped ? amount : amount * 0.62137}
placeholder="Miles"
type="number"
onChange={onChange}
disabled={!flipped}
/>
</div>
<button onClick={reset}>Reset</button>
<button onClick={onFlip}>{flipped ? "km -> miles" : "km -> minute"}</button>
</div>
);
}
function App() {
const [index, setIndex] = React.useState("xx");
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>
<hr />
{index === "0" ? <MinutesToHours /> : null}
{index === "1" ? <KmToMiles /> : null}
</div>
);
}
const root = document.getElementById("root");
ReactDOM.render(<App />, root);
</script>
</html>