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13-side-effects.html
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13-side-effects.html
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<body>
<div id="root"></div>
<script src="https://unpkg.com/react@16.12.0/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16.12.0/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/@babel/standalone@7.8.3/babel.js"></script>
<script type="text/babel">
function Greeting() {
const [name, setName] = React.useState(
window.localStorage.getItem("name") || ""
);
React.useEffect(() => {
window.localStorage.setItem("name", name);
});
const handleChange = (event) => setName(event.target.value);
return (
<div>
<form>
<label htmlFor="name">Name: </label>
<input value={name} onChange={handleChange} id="name" />
</form>
{name ? <strong>Hello {name}</strong> : "Please type your name"}
</div>
);
}
ReactDOM.render(<Greeting />, document.getElementById("root"));
</script>
</body>