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Switch — spec

Synthesized from Ant Design Switch, MUI Switch, shadcn-ui switch. iOS-style toggle for binary on/off settings. See component-form-controls.md for Switch + Checkbox + Radio comparison.

Switch vs Checkbox

Switch = immediate effect setting. Checkbox = form input.

  • Settings page: Switch ("Enable notifications" — toggles immediately).
  • Signup form: Checkbox ("I agree to terms" — submitted with form).

Anatomy

Off:     ◯━━ ━━━━━           On:     ━━━━━ ━━●

Track + thumb. Thumb slides from left to right when toggled.

API

<Switch
  checked={enabled}
  onCheckedChange={setEnabled}
  id="notifications"
/>

<Switch checked={loading ? enabled : ...} disabled={loading} />
Prop Type Default Description
checked boolean controlled State
defaultChecked boolean false Uncontrolled initial
onCheckedChange (checked: boolean) => void — Callback
disabled boolean false —
size "sm" \| "md" \| "lg" "md" —
name / value string — Form attributes

Sizes

Size Track w×h Thumb
sm 28×16 12
md (default) 44×24 20
lg 56×32 28

Touch target ≥ 44pt regardless via padding.

States

State Visual
Off Track: muted gray; thumb left
On Track: brand color; thumb right
Hover Subtle track color shift
Focus-visible Ring around track
Disabled Reduced opacity
Loading (optional) Spinner replaces thumb

Tokens consumed

--switch-track-off
--switch-track-on               (brand)
--switch-thumb
--switch-thumb-disabled
--motion-fast                   (200ms slide)
--ease-out

Accessibility

  • <button role="switch" aria-checked="true|false">.
  • aria-label if no visible label.
  • Keyboard: Space toggles; Enter doesn't (per WAI-ARIA Switch).

Korean conventions

  • 알림 받기, 다크 모드, 자동 저장 — typical settings labels (해요체).
  • For 마케팅 정보 수신: use Checkbox (form), not Switch (immediate effect).

Don't

  • Don't use Switch in forms with Submit. That's Checkbox.
  • Don't make Switch < 28px wide. Touch / readability.
  • Don't lazy-render label state ("On" / "Off") — let the visual track show state.

References

Cross-reference