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11-event-handlers.html
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11-event-handlers.html
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<body>
<div id="root"></div>
<script src="https://unpkg.com/[email protected]/umd/react.development.js"></script>
<script src="https://unpkg.com/[email protected]/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/@babel/[email protected]/babel.js"></script>
<script type="text/babel">
const rootElement = document.getElementById('root')
const state = {eventCount: 0, username: ''}
function App() {
function handleClick() {
setState({eventCount: state.eventCount + 1})
}
function handleChange(event) {
setState({username: event.target.value})
}
return (
<div>
<p>There have been {state.eventCount} events.</p>
<p>
<button onClick={handleClick}>Click Me</button>
</p>
<p>You typed: {state.username}</p>
<p>
<input onChange={handleChange} />
</p>
</div>
)
}
function setState(newState) {
Object.assign(state, newState)
renderApp()
}
function renderApp() {
ReactDOM.render(<App />, document.getElementById('root'))
}
renderApp()
</script>
</body>