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useeffect

React useEffect hook for side effects

WebWhy Bootstrap Modal shown.bs.modal Fires Twice in React useEffect

Learn why Bootstrap 'shown.bs.modal' event fires twice in React useEffect (empty deps, no StrictMode) but once in plain JS. Fixes include cleanup, ref guards, and react bootstrap alternatives for reliable modal events.

6 answers• 1 view
WebShould useEffectEvent Return Cleanup for useEffect?

Don't return cleanup from useEffectEvent. Keep lifecycle cleanup inside useEffect; useEffectEvent should be for stable event logic to avoid stale closures.

1 answer• 1 view
WebWhy useEffect placement affects child re-renders in React

Explain how React useEffect placement and unreachable early returns affect child re-renders with react-hook-form. Covers hook order and practical fixes.

1 answer• 1 view
WebFix React setState Warning in useEffect Next.js 16

Resolve the React warning 'Calling setState synchronously within an effect' in Next.js 16.0.7 with React 19.2.0. Learn useEffectEvent, batching multiple state updates, and best practices to avoid cascading renders and performance issues.

1 answer• 1 view