Select

Single-select listbox with a portalled popup. Built on @base-ui/react/select: Base UI owns `role="combobox"` / `role="listbox"`, typeahead, arrow + Home/End navigation, focus return on close, and the controlled/uncontrolled pair (`value` + `onValueChange`…

form & inputclient320pxuiv1.1.0

Preview

Select — live renderprimitives-select--default

Rendered from the story the storybook (a11y) CI gate runs axe against — the preview can't show something that hasn't been verified.

Install

Two equivalent paths — the URL works in any shadcn-CLI setup; the alias works once you've registered @interlace in your components.json.

Via shadcn URL
npx shadcn@latest add https://ds.interlace.tools/r/select.json
With the @interlace alias
npx shadcn@latest add @interlace/select

Behavior

What this component does — the keyboard path, the measured colour, the text equivalent and the states it can be in. Every figure below is read out of the test or the source that enforces it by scripts/build-behavior-map.mjs, so nothing here can outlive the gate that keeps it true.

4 steps, 4 key presses — replayed on every PR by the play function of KeyboardFlow. Axe cannot press a key, so this — not the a11y scan — is what proves the component is operable without a mouse.

  1. 1The trigger advertises the listbox it owns
  2. 2Enter opens the popup and focuses an optionEnterTab
  3. 3ArrowDown roves to the next optionArrowDown
  4. 4Escape closes and restores focus to the triggerEscape

Escape is locked, not merely exercised. This primitive is in KEYBOARD_DRIVEN + MUST_ASSERT_ESCAPE — deleting the dismissal assertion from the story fails overlay-nav-keyboard-lock, so the path above cannot quietly stop being tested.

Every semantic colour pair this component's own source uses, measured against the shipped hexes in all 4 theme × scheme combinations. The tightest is input on card at 3.11:1 (interlace · dark), against a floor of 3:1.

Measured WCAG contrast ratios per token pair and theme
PairinterlacelightinterlacedarkharborlightharbordarkFloor
input on cardcontrol border inside a card3.62:13.11:13.62:13.85:13.0:1SC 1.4.11
input on backgroundcontrol border (SC 1.4.11)3.62:13.35:13.43:14.25:13.0:1SC 1.4.11
muted-foreground on backgroundsecondary copy9.41:111.32:17.82:19.52:14.5:1SC 1.4.3
muted-foreground on cardsecondary copy in a card9.41:110.48:18.25:18.64:14.5:1SC 1.4.3
ring on backgroundfocus ring (SC 2.4.13)8.80:111.79:18.39:110.03:13.0:1SC 1.4.11
primary on backgroundprimary tint on the page surface8.80:111.79:18.39:110.03:13.0:1SC 1.4.11
ring on cardfocus ring inside a card8.80:110.92:18.86:19.10:13.0:1SC 1.4.11
primary-foreground on primarycopy on a primary face8.80:111.79:18.86:110.03:14.5:1SC 1.4.3
primary on cardprimary tint inside a card8.80:110.92:18.86:19.10:13.0:1SC 1.4.11
accent-foreground on accenthover/highlight face8.98:110.46:18.95:19.65:14.5:1SC 1.4.3
popover-foreground on popovercopy in a popover19.65:115.71:118.72:114.69:14.5:1SC 1.4.3

Text pairs are held to 4.5:1 (WCAG 2.2 SC 1.4.3); borders, rings and chart axes to 3:1 (SC 1.4.11 non-text). Bold is the worst cell in the row — the one a brand fork has to keep an eye on.

Where it renders, how narrow it survives, and whether its lines are inside the coverage gate — three answers a consumer needs before the paste, not after the bug.

Render boundary
'use client'

Hydrates. It brings JavaScript to any route that imports it — put the boundary here, not at the page.

Minimum viewport
MIN_VIEWPORT = 320

Declared, not assumed. Below 320 CSS px the preflight contract draws a dev-mode outline — how to switch it on.

Coverage gate
not in the gate

The 100% gate currently covers src/charts/**/*.{ts,tsx} and src/lib/**/*.{ts,tsx} and src/primitives/{button-variants,data-state-model,meter-scale,skeleton-variants}.ts and src/primitives/{alert,aspect-ratio,avatar,badge,box,breadcrumb,button,callout,card,checkbox,code-editor,container,data-state,focus-ring,grade-badge,grid,input,label,meter,pagination,published-date,reading-time,section,section-boundary,separator,skip-link,stack,stat-strip,tag,textarea,typography,visually-hidden}.tsx and src/patterns/lint-playground.tsx. This file is outside it — the glob widens in phase 7.2.

History

This component is at v1.1.0, first shipped in @interlace/ui 1.0.0. The version is stamped as a banner into the file the install writes, so the copy in your tree says which one you have — compare it with the number above before deciding whether to re-run the install.

Import

12 named exports — pull the parts you need.

Public API
import { MIN_VIEWPORT, Select, SelectContent, SelectGroup, SelectGroupLabel, SelectItem, SelectPortal, SelectScrollDownButton, SelectScrollUpButton, SelectSeparator, SelectTrigger, SelectValue } from '@/components/ui/select';

Anatomy

Extracted from the primitive's JSDoc header. The source is the only documentation that can't drift.

Select (Root)                            (no DOM — state provider)
    ├─ SelectTrigger                       (button — data-min-viewport=320)
    │   ├─ SelectValue                     (the current selection / placeholder)
    │   └─ (chevron icon)
    └─ SelectContent                       (portal → positioner → popup)
        ├─ SelectScrollUpButton
        ├─ SelectGroup → SelectGroupLabel
        ├─ SelectItem                      (repeats)
        ├─ SelectSeparator
        └─ SelectScrollDownButton

API reference

Parsed from the type declarations in the source — the same file the install writes into your tree, so this table can't drift from the component you get.

SelectValue

Also accepts every prop of Base UI's <Select.Value> — behaviour we compose rather than reimplement.

PropTypeDescription
placeholderReact.ReactNode

SelectTrigger

Also accepts every prop of Base UI's <Select.Trigger> — behaviour we compose rather than reimplement.

PropTypeDefaultDescription
size'sm' | 'default''default'

SelectContent

Also accepts every prop of Base UI's <Select.Positioner> — behaviour we compose rather than reimplement.

PropTypeDescription
popupClassNamestring

SelectGroupLabel

Also accepts every prop of Base UI's <Select.GroupLabel> — behaviour we compose rather than reimplement.

SelectItem

Also accepts every prop of Base UI's <Select.Item> — behaviour we compose rather than reimplement.

SelectSeparator

Also accepts every prop of Base UI's <Select.Separator> — behaviour we compose rather than reimplement.

SelectScrollUpButton

Also accepts every prop of Base UI's <Select.ScrollUpArrow> — behaviour we compose rather than reimplement.

SelectScrollDownButton

Also accepts every prop of Base UI's <Select.ScrollDownArrow> — behaviour we compose rather than reimplement.

Accessibility

Every story for this component is rendered headlessly and checked with axe-core (wcag2aa, wcag22aa, best-practice, ACT) on every PR. That gate has no continue-on-error, so what ships has zero known violations.

What follows is what static analysis can see. Axe cannot press a key and never sees an overlay open, so the operable-without-a-mouse claim lives in Behavior instead, where the keyboard path is replayed step by step.

Focus + keyboard behaviour
Owned by @base-ui/react/select — focus trapping, dismissal and typeahead come from the headless primitive, not from us.
Focus ring (WCAG 2.2 SC 2.4.13)
Inherited from the preflight focus contract shipped in @interlace/theme.
Reduced motion
No animation to gate.
ARIA in the source
  • role="combobox"
  • role="listbox"

Examples

6 more states from the same story file.

R-rule compliance

Every primitive in @interlace/ui models to the portable 26-rule floor enforced by the componentApi ESLint preset. The cells below pin exactly where each rule applies in this file.

RuleConceptWhere
R4Extends Base UI part propseach wrapper extends its Base UI part's props
R6data-slot per part`select-trigger` / `-positioner` / `-popup` / `-item` / …
R7className merged + ...rest`cn(BASE, className)` + `{...props}` on every part
R11Composition over prop-drillingitems are children, not an `options` array prop
R12Reuse over wrapBase UI owns typeahead, positioning and ARIA
R14Declares min viewport`data-min-viewport={String(MIN_VIEWPORT)}` on the trigger
R18Tailwind onlyzero inline `style`
R19Tokens onlysemantic colour tokens throughout
R20AA contrasttable above — every composite measured
R25Client componentrequired — Base UI Select ships client hooks
R26A11y from upstreamcombobox/listbox ARIA + full keyboard model

Minimum viewport

This primitive declares MIN_VIEWPORT = 320 CSS px (DESIGN_PRINCIPLES #14). When mounted in a container narrower than this, the preflight contract draws a dev-mode outline so the regression is visible during local development.

Opt-in to the dev-mode warning
<body data-interlace-dev>...</body>

Add the data-interlace-dev attribute to the body in development builds only — preflight then outlines any primitive whose container is below its declared data-min-viewport.

Dependencies

Base UI primitive
@base-ui/react/select
Lucide icons
  • CheckIcon
  • ChevronDownIcon
  • ChevronUpIcon
NPM dependencies
  • @base-ui/react
  • lucide-react
Registry dependencies

Source

The full implementation — components/ui/select.tsx once installed.

282 lines · TypeScript
'use client';

import * as React from 'react';

// @interlace/select v1.1.0 — Interlace design system.
// Docs, props and live preview: https://ds.interlace.tools/c/select
// What changed since: https://ds.interlace.tools/c/select#history
// Generated banner — keep it, the upgrade diff reads this version.

/**
 * @interlace/ui — Select
 *
 * Single-select listbox with a portalled popup. Built on
 * @base-ui/react/select: Base UI owns `role="combobox"` / `role="listbox"`,
 * typeahead, arrow + Home/End navigation, focus return on close, and the
 * controlled/uncontrolled pair (`value` + `onValueChange` / `defaultValue`).
 * Mirrors: https://ui.shadcn.com/docs/components/select
 *
 * ## Anatomy
 *

…262 more lines…

Registry JSON

The raw registry record — what the shadcn CLI fetches.