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MobileStepper — spec

Synthesized from MUI MobileStepper. Compact step indicator for mobile-first flows — shows progress as dots, text, or a progress bar. Used in onboarding, image carousels, multi-step bottom sheets.

When to use

  • Mobile onboarding flow (3-7 steps).
  • Carousel position indicator.
  • Multi-step bottom sheet.

When NOT to use

  • Desktop multi-step form → use Stepper (horizontal, labeled).
  • Single-step → no indicator needed.
  • Long flows (10+ steps) → use a percentage progress instead.

Anatomy

Variant = "dots":
┌──────────────────────────────────────────┐
│  [Back]    ● ○ ○ ○ ○             [Next] │
└──────────────────────────────────────────┘

Variant = "progress":
┌──────────────────────────────────────────┐
│  [Back]    ▓▓▓▓░░░░░░░░░░         [Next] │
└──────────────────────────────────────────┘

Variant = "text":
┌──────────────────────────────────────────┐
│  [Back]         3 / 7             [Next] │
└──────────────────────────────────────────┘

API

<MobileStepper
  variant="dots"
  steps={5}
  position="bottom"
  activeStep={step}
  nextButton={
    <Button onClick={handleNext} disabled={step === 4}>
      다음 <KeyboardArrowRight />
    </Button>
  }
  backButton={
    <Button onClick={handleBack} disabled={step === 0}>
      <KeyboardArrowLeft /> 이전
    </Button>
  }
/>
Prop Type Default Description
variant 'dots' \| 'progress' \| 'text' 'dots' Indicator style
steps number required Total steps
activeStep number 0 Current step (0-indexed)
position 'bottom' \| 'top' \| 'static' 'bottom' Sticky position
nextButton ReactNode required Next button element
backButton ReactNode required Back button element
LinearProgressProps LinearProgressProps — Customize progress variant

States

State Visual
Step N active Nth dot filled / progress bar at N/total / "N / total" text
First step Back button disabled
Last step Next button label often changes ("완료" / "Done")

Tokens consumed

--space-md                 /* horizontal padding */
--dot-size-8               /* dot diameter */
--dot-color-active         /* brand */
--dot-color-inactive       /* fg-subtle */
--mobile-stepper-height-48

Accessibility

  • The buttons own their accessible names. The stepper itself has no implicit role.
  • For screen-reader announcement of progress, add live region: aria-live="polite" on the step text.
  • Don't disable navigation buttons — MUI does it; but ensure focus moves elsewhere when disabled (e.g., to the form below).

Edge cases

  • Too many steps — 8+ dots become unreadable. Switch to progress or text variant.
  • Korean step labels — use "다음" / "이전" / "완료" / "건너뛰기". Cite knowledge/i18n/korean-product-conventions.md.
  • Last-step Next button — label change to "완료" + change onClick to submit. Pair with optimistic UI for snappy feel.
  • Position="static" — embeds inline (good inside cards/sheets); bottom floats to viewport bottom.

Code example

function OnboardingFlow() {
  const [step, setStep] = useState(0);
  const totalSteps = 4;
  const isLast = step === totalSteps - 1;

  return (
    <Box sx={{ height: '100vh', display: 'flex', flexDirection: 'column' }}>
      <Box sx={{ flex: 1, p: 2, overflowY: 'auto' }}>
        {step === 0 && <WelcomeStep />}
        {step === 1 && <ProfileStep />}
        {step === 2 && <PreferencesStep />}
        {step === 3 && <SummaryStep />}
      </Box>
      <MobileStepper
        variant="dots"
        steps={totalSteps}
        position="static"
        activeStep={step}
        nextButton={
          <Button
            onClick={isLast ? handleSubmit : () => setStep(step + 1)}
            variant={isLast ? 'contained' : 'text'}
          >
            {isLast ? '완료' : '다음'}
            {!isLast && <KeyboardArrowRight />}
          </Button>
        }
        backButton={
          <Button onClick={() => setStep(step - 1)} disabled={step === 0}>
            <KeyboardArrowLeft />
            이전
          </Button>
        }
      />
    </Box>
  );
}

Don't

  • Don't use without nextButton + backButton — required props.
  • Don't use on desktop — too small / sparse for desktop scale; use Stepper.
  • Don't change the indicator type mid-flow.

References

Cross-reference