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November 13, 2018 13:46
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Inline React component that shows animated counter updates using React Hooks.
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| <head> | |
| <script src="https://unpkg.com/[email protected]/umd/react.production.min.js" crossorigin></script> | |
| <script src="https://unpkg.com/[email protected]/umd/react-dom.production.min.js" crossorigin></script> | |
| <script src="https://unpkg.com/[email protected]/babel.min.js" crossorigin></script> | |
| <style> | |
| span.gone { | |
| color : transparent; | |
| transition: color 0.3s; | |
| -webkit-transition: color 0.3s; | |
| } | |
| span.visible { | |
| transition: color 0.3s; | |
| -webkit-transition: color 0.3s; | |
| color : black; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script type="text/babel"> | |
| const useEffect = React.useEffect; | |
| const useState = React.useState; | |
| const useRef = React.useRef; | |
| const TIMEOUT = 300;//ms | |
| const useAnimateChanges = (value, spanEl) => useEffect(() => { | |
| setTimeout( _=> spanEl.current.className = "visible",TIMEOUT) | |
| return () => { | |
| spanEl.current.className = "gone"; | |
| } | |
| }, [value]); | |
| function Digit({value}) { | |
| const spanEl = useRef(null); | |
| const [digit, setDigit] = useState(null); | |
| setTimeout(_ => setDigit(value), TIMEOUT); | |
| useAnimateChanges(value, spanEl); | |
| return <span ref={spanEl}>{digit}</span> | |
| } | |
| function Clicker() { | |
| const [count, setCount] = useState(0); | |
| return <div>You clicked {count} times. | |
| <div style={{fontSize : 400}}> | |
| {new String(count).split("").map((v, index, arr) => <Digit key={arr.length-index-1} value={v} />)} | |
| </div> | |
| <button onClick={_=>setCount(count+1)}>Click Me!</button> | |
| </div> | |
| } | |
| ReactDOM.render(<div><Clicker/></div> | |
| , document.getElementById('container')); | |
| </script> | |
| <div id="container"> | |
| </div> | |
| <!-- <div id="text"> | |
| <span id="counter" style="font-size : 300px">0</span> | |
| </div> | |
| <button onclick="flash()">Flash Me!</button> | |
| <script> | |
| let counter = 0 | |
| function flash() { | |
| const text = document.getElementById("counter"); | |
| text.className = "gone"; | |
| setTimeout(_ => text.innerHTML = ""+ (++counter), 300); | |
| setTimeout(_ => text.className = "visible", 600); | |
| ; | |
| } | |
| </script> --> | |
| </body> |
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