React 이해를 위한 예제
2023. 9. 14. 12:38ㆍ카테고리 없음
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노마드 코더를 통해 리액트 재공부중
이해를 위해 주석을 달아 직관적으로 확인하기 위해 기록을 남기기로 함
큰 블럭의 정리는 아래와 같으며,
펼친 소스는 다음과 같다
<!DOCTYPE html>
<html lang="ko">
<body>
<div id="root"></div>
</body>
<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">
// conmponent MinutesToHours start
function MinutesToHours() {
// props{} and useStat[value.modifier]
const [amount,setAmount] = React.useState(0);
const [invert,setInvert] = React.useState(false);
// fuction Area start
const onChange = (event) => {
setAmount(event.target.value);
}
const reset = () => setAmount(0);
const onInvert = () => {
reset();
setInvert((current) => !current);
}
// fuction Area end
return (
// pseudo-HTML format Area start
<div>
<div>
<input
value={invert ? amount*60 : amount}
id="minutes"
placeholder="Minutes"
type="number"
onChange={onChange}
disabled={invert === true} />
<label htmlfor="minutes"> Minutes</label>
</div>
<div>
<input
//value={invert ? amount : Math.round(amount / 60)}
value={invert ? amount : (amount / 60).toFixed(1)}
id="hours"
placeholder="Hours"
type="number"
onChange={onChange}
disabled={invert === false} />
<label htmlfor="hours"> Hours</label>
</div>
<button onClick={reset}>Reset</button>
<button onClick={onInvert}>{invert ? "Turn back" : "Invert"}</button>
</div>
// pseudo-HTML format Area end
);
}
// conmponent MinutesToHours end
// conmponent KmToMiles start
function KmToMiles () {
// props{} and useStat[value.modifier]
const [amount1,setAmount1] = React.useState("0");
const [invert1,setInvert1] = React.useState(false);
// fuction Area start
const onChange1 = (event) => {
console.log(event.target.value);
setAmount1(event.target.value);
}
const reset = () => setAmount1(0);
const onInvert = () => {
reset();
setInvert1((current) => !current);
}
// fuction Area end
return (
// pseudo-HTML format Area start
<div>
<div>
<input
value={invert1 ? amount1*1000 : amount1}
id="meters"
placeholder="Meters"
type="number"
onChange={onChange1}
disabled={invert1 === true} />
<label htmlfor="meters"> m</label>
</div>
<div>
<input
//value={invert1 ? amount1 : Math.round(amount1 / 1000)}
value={invert1 ? amount1 : (amount1 / 1000).toFixed(2)}
id="kilo-m"
placeholder="kilo-m"
type="number"
onChange={onChange1}
disabled={invert1 === false} />
<label htmlfor="kilo-m"> km</label>
</div>
<button onClick={reset}>Reset</button>
<button onClick={onInvert}>{invert1 ? "Turn back" : "Invert"}</button>
</div>
// pseudo-HTML format Area end
)
}
// conmponent KmToMiles end
//==============================================================================================
// React Main handling for render 'div-id:root'
function App() {
// props{} and useStat[value.modifier]
const [index, setIndex] = React.useState("-1");
//const [index, setIndex] = React.useState("0");
// fuction Area start
const onSelect = (event) => {
console.log(event.target.value);
setIndex(event.target.value);
}
// fuction Area end
return (
// pseudo-HTML format Area start
<div>
<h1 class="hi">Super Converter</h1>
<select value={index} onChange={onSelect}>
<option value="-1">Select your units</option>
<option value="0">Minutes & Hours</option>
<option value="1">Km & Miles</option>
</select>
<hr />
{index === "-1" ? "Please select your units" : null }
{index === "0" ? <MinutesToHours /> : null }
{index === "1" ? <KmToMiles /> : null }
</div>
// pseudo-HTML format Area end
);
}
// React Main handling End
//==============================================================================================
// React Main Steam render 'div-id:root'
const root = document.getElementById("root");
ReactDOM.render(<App />,root);
// React Main Steam render 'div-id:root'
//==============================================================================================
</script>
</html>
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