Setting Up a Controlled Component

Short summary

A React tutorial demonstrating how to refactor an uncontrolled navigation component into a controlled component for responsive mobile layouts while maintaining accessibility. The article covers parent-managed state, focus shifting between trigger and navigation, keyboard trapping, and pressing Escape to close. Written in TypeScript with Next.js v16 examples; part of a comprehensive multi-part series with fully runnable code available on GitHub.

• •Controlled components let parent manage state and focus behavior
• •Mobile nav requires focus shifting and tab-trap handling
• •Accessibility must be reconsidered when adding new constraints

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