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11-event-handlers.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>11-event-handlers</title>
</head>
<body>
<div id="root"></div>
<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">
const rootEl = document.getElementById("root");
const state = { eventCount: 0, userName: "" };
const App = () => {
const handleClick = () => {
setState({ eventCount: state.eventCount + 1 });
};
const handleChange = (e) => {
setState({ userName: e.target.value });
};
return (
<div>
<p>
There have been <strong>{state.eventCount}</strong> events
</p>
<p>
<button onClick={handleClick}>Click Me</button>
</p>
<p>You typed: {state.userName}</p>
<p>
<input onChange={handleChange} />
</p>
</div>
);
};
const setState = (newState) => {
Object.assign(state, newState);
renderApp();
};
const renderApp = () => ReactDOM.render(<App />, rootEl);
renderApp();
</script>
</body>
</html>