Events and Forms

Harry · 22 Sep 2026 · 1 views

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React Events

Synthetic camelCase events: onClick, onChange, onSubmit. Always call e.preventDefault() in submit handlers.

Controlled Components

const [v, setV] = useState('');
<input value={v} onChange={e => setV(e.target.value)} />

Validation

Validate on submit and on blur; show inline errors; disable submit until valid.

Key Points

Controlled inputs render from state.
Uncontrolled inputs use refs for simple cases.
Keyboard and mouse events attach via props or document listeners with cleanup.

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State Basics with useState useEffect and API Calls

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