To ensure that previously filled data is retained and displayed when users navigate back to a completed tab, the existing setup with formData already handles this seamlessly. The form data for each tab is stored in the formData state, which pre-fills input fields whenever a tab is revisited. If there are validation errors, these are displayed based on the errors state, ensuring users are reminded to correct any incomplete or incorrect fields.
For a better user experience, you can enhance navigation by visually indicating completed tabs using a separate state, such as completedTabs. Completed tabs could be styled differently, such as with a green background or checkmark, to inform users which sections they have already finished. When users switch tabs, validation should be performed on the current tab, and if errors exist, users should be notified and prevented from moving forward until corrections are made. If they return to a previously completed tab, the input fields will display their saved data, and any unresolved errors will still be visible, ensuring continuity and clarity.
These enhancements ensure smooth navigation, clear progress tracking, and consistency in form data handling across all tabs, leading to an intuitive and user-friendly experience.