dcaaef1011
Format: YYYY-MM-DD-description.md - 2026-01-19-infrastructure-deployment.md - 2026-01-19-backend-api-implementation.md (in progress) Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>
27 lines
564 B
Markdown
27 lines
564 B
Markdown
---
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title: Use Activity Component for Show/Hide
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impact: MEDIUM
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impactDescription: preserves state/DOM
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tags: rendering, activity, visibility, state-preservation
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---
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## Use Activity Component for Show/Hide
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Use React's `<Activity>` to preserve state/DOM for expensive components that frequently toggle visibility.
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**Usage:**
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```tsx
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import { Activity } from 'react'
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function Dropdown({ isOpen }: Props) {
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return (
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<Activity mode={isOpen ? 'visible' : 'hidden'}>
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<ExpensiveMenu />
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</Activity>
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)
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}
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```
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Avoids expensive re-renders and state loss.
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