Dynamically change items in a dropdown list

Update dropdown options based on the selection in another dropdown (cascading/dependent dropdowns).

When to use

Use this pattern when:

• Options in one dropdown depend on the selection in another
• You need to filter available choices based on a category
• Building hierarchical selection interfaces (e.g., country/state/city)

Considerations

• Use mountType="reset" to clear and repopulate dropdown items
• Generate unique keys for items to ensure proper re-rendering
• Provide placeholder text to guide users when no selection is made
• Consider loading states if data fetching is required