Tree Select
A Tree Select shows nested choices in an openable tree. It can allow one or many choices.
A real example
An admin assigns a report to teams. The company and department levels stay visible during selection.
Main parts
- 01Persistent label
- 02Input control
- 03Hint or format
- 04Validation message
Use it when
Use it when people must see the hierarchy while choosing one or more items.
Do not use it when
Do not place a huge tree in a small popup without search, virtual scrolling, and clear partial states.
Name used in code
role=tree + treeitem + selection state Before you ship
Give each field a label that code can read. Link hints and errors, and keep entered values. Check autofill, keyboard order, validation timing, submit states, failure recovery, zoom, and languages.
Outcome: Use Tree Select to solve this user need without losing the current context. User context: An admin assigns a report to teams. The company and department levels stay visible during selection. Recommended pattern: Tree Select. Why it fits: Use it when people must see the hierarchy while choosing one or more items. Do not use it when: Do not place a huge tree in a small popup without search, virtual scrolling, and clear partial states. Product requirements: Define the default, loading, empty, error, success, and recovery states. Keep user input. Give clear feedback after every action. Accessibility and resilience: Use semantic HTML, full keyboard access, and visible focus. Make the layout work when zoomed and support reduced motion. Follow the project’s current rules. Do not add a new UI library unless the project already uses it. Acceptance criteria: The main task works with keyboard only and at 320px width. Focus and status changes are announced. Check loading, failure, retry, cancel, and reduced-motion paths. Evidence and limits (evidence boundary): No single official standard controls the whole term. Its meaning may change across teams, platforms, or frameworks. Unknowns to confirm: Product wording, data source, analytics events, supported devices and languages, and platform limits.
Check this request
Review the current use of Tree Select. Definition: A Tree Select shows nested choices in an openable tree. It can allow one or many choices. Release checks: Give each field a label that code can read. Link hints and errors, and keep entered values. Check autofill, keyboard order, validation timing, submit states, failure recovery, zoom, and languages. Before changing code, report the evidence you found, gaps, severity, and the smallest safe fix.