04Phone input with country code select

<main class="stage">
  <div class="phone is-demo" id="wrap">
    <span class="phone__label" id="phone-label">Phone number</span>
    <div class="phone__row">
      <div class="phone__trigger-wrap">
        <button type="button" class="phone__trigger" id="trigger"
                aria-haspopup="listbox" aria-expanded="false" aria-controls="listbox"
                aria-label="Select country, currently South Korea">
          <span class="phone__flag" aria-hidden="true">🇰🇷</span>
          <span class="phone__dial">+82</span>
          <span class="phone__chevron" aria-hidden="true"></span>
        </button>
        <ul class="phone__listbox" id="listbox" role="listbox" aria-label="Country list" tabindex="-1" hidden>
          <li role="option" id="opt-kr" class="phone__option" data-code="kr" aria-selected="true">
            <span aria-hidden="true">🇰🇷</span> South Korea <span class="phone__option-dial">+82</span>
          </li>
          <li role="option" id="opt-us" class="phone__option" data-code="us" aria-selected="false">
            <span aria-hidden="true">🇺🇸</span> United States <span class="phone__option-dial">+1</span>
          </li>
          <li role="option" id="opt-jp" class="phone__option" data-code="jp" aria-selected="false">
            <span aria-hidden="true">🇯🇵</span> Japan <span class="phone__option-dial">+81</span>
          </li>
        </ul>
      </div>
      <input class="phone__input" id="number" type="text" inputmode="numeric" placeholder="10 1234 5678" aria-labelledby="phone-label" aria-describedby="phone-hint">
    </div>
    <p class="phone__hint" id="phone-hint">Arrow keys to pick a country · Enter to confirm</p>
  </div>
</main>

@use "../../../../site/static/demo-tokens" as *;

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-quick;      // 목록 열림/닫힘 시간
$easing: $ease-out;         // 빠르게 시작해 부드럽게 멈춤
$color: $subject-blue;      // 트리거 포커스·선택 강조 색

// ── 데모 무대 ──────────────────────────────────────────
@include stage($stage-paper);

.phone {
  box-sizing: border-box;
  width: min(296px, 88vw);
  background: $subject-cream;
  border-radius: $r-card;
  padding: $sp-5;
  box-shadow: $shadow-raised;

  &__label {
    display: block;
    margin: 0 0 $sp-2;
    font-weight: 700;
    font-size: 13px;
    line-height: 1;
    font-family: inherit;
    color: $stage-ink;
  }

  &__row {
    display: flex;
    gap: $sp-2;
  }

  &__trigger-wrap {
    position: relative;
    flex: 0 0 auto;
  }

  &__trigger {
    box-sizing: border-box;
    height: 100%;
    display: flex;
    align-items: center;
    gap: $sp-1;
    border: 2px solid transparent;
    border-radius: $r-control;
    padding: $sp-3 $sp-2;
    background: #fff;
    font-weight: 600;
    font-size: clamp(13px, 3.6vw, 15px);
    font-family: inherit;
    color: $stage-ink;
    white-space: nowrap;
    cursor: pointer;
    transition: border-color $duration $easing;

    &:focus-visible { outline: none; border-color: $color; }
    &[aria-expanded="true"] { border-color: $color; }
  }

  &__flag { font-size: 16px; line-height: 1; }
  &__dial { font-variant-numeric: tabular-nums; }

  &__chevron {
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid currentColor;
    transition: transform $duration $easing;
  }
  &__trigger[aria-expanded="true"] &__chevron { transform: rotate(180deg); }

  &__input {
    box-sizing: border-box;
    flex: 1 1 auto;
    min-width: 0;
    border: 2px solid transparent;
    border-radius: $r-control;
    padding: $sp-3 $sp-3;
    font-weight: 500;
    font-size: clamp(14px, 4.2vw, 16px);
    font-family: inherit;
    color: $stage-ink;
    background: #fff;
    transition: border-color $duration $easing;
    &:focus { outline: none; border-color: $color; }
  }

  &__hint {
    margin: $sp-2 0 0;
    font-size: 11px;
    line-height: 1.4;
    font-family: inherit;
    color: rgba($stage-ink, .72);
  }

  &__listbox {
    position: absolute;
    top: calc(100% + #{$sp-1});
    left: 0;
    width: min(190px, 75vw);
    max-height: 160px;
    overflow-y: auto;
    margin: 0;
    padding: $sp-1;
    list-style: none;
    background: #fff;
    border-radius: $r-sm;
    box-shadow: $shadow-raised;
    z-index: 10;
    transform-origin: top; // 규칙8: 트리거 아래변에서 펼침
    opacity: 0;
    transform: scaleY(.9) translateY(-4px);
    pointer-events: none;

    &.is-open {
      opacity: 1;
      transform: scaleY(1) translateY(0);
      pointer-events: auto;
      transition: opacity $duration $easing, transform $duration $easing;
    }
  }

  &__option {
    display: flex;
    align-items: center;
    gap: $sp-1;
    padding: $sp-2 $sp-2;
    border-radius: $r-xs;
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    color: $stage-ink;
    cursor: pointer;

    &-dial {
      margin-left: auto;
      font-variant-numeric: tabular-nums;
      opacity: .7;
    }
    &--active { background: rgba($color, .12); }
    &[aria-selected="true"] { font-weight: 700; color: $color; }
  }
}

@media (prefers-reduced-motion: reduce) {
  .phone__listbox { transition: none !important; }
  .phone__trigger, .phone__input, .phone__chevron { transition: none; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffffff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.phone {
  box-sizing: border-box;
  width: min(296px, 88vw);
  background: #fff7e6;
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}
.phone__label {
  display: block;
  margin: 0 0 8px;
  font-weight: 700;
  font-size: 13px;
  line-height: 1;
  font-family: inherit;
  color: #17141a;
}
.phone__row {
  display: flex;
  gap: 8px;
}
.phone__trigger-wrap {
  position: relative;
  flex: 0 0 auto;
}
.phone__trigger {
  box-sizing: border-box;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 4px;
  border: 2px solid transparent;
  border-radius: 12px;
  padding: 12px 8px;
  background: #fff;
  font-weight: 600;
  font-size: clamp(13px, 3.6vw, 15px);
  font-family: inherit;
  color: #17141a;
  white-space: nowrap;
  cursor: pointer;
  transition: border-color 220ms ease-out;
}
.phone__trigger:focus-visible {
  outline: none;
  border-color: #2f6df6;
}
.phone__trigger[aria-expanded=true] {
  border-color: #2f6df6;
}
.phone__flag {
  font-size: 16px;
  line-height: 1;
}
.phone__dial {
  font-variant-numeric: tabular-nums;
}
.phone__chevron {
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  transition: transform 220ms ease-out;
}
.phone__trigger[aria-expanded=true] .phone__chevron {
  transform: rotate(180deg);
}
.phone__input {
  box-sizing: border-box;
  flex: 1 1 auto;
  min-width: 0;
  border: 2px solid transparent;
  border-radius: 12px;
  padding: 12px 12px;
  font-weight: 500;
  font-size: clamp(14px, 4.2vw, 16px);
  font-family: inherit;
  color: #17141a;
  background: #fff;
  transition: border-color 220ms ease-out;
}
.phone__input:focus {
  outline: none;
  border-color: #2f6df6;
}
.phone__hint {
  margin: 8px 0 0;
  font-size: 11px;
  line-height: 1.4;
  font-family: inherit;
  color: rgba(23, 20, 26, 0.72);
}
.phone__listbox {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  width: min(190px, 75vw);
  max-height: 160px;
  overflow-y: auto;
  margin: 0;
  padding: 4px;
  list-style: none;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  z-index: 10;
  transform-origin: top;
  opacity: 0;
  transform: scaleY(0.9) translateY(-4px);
  pointer-events: none;
}
.phone__listbox.is-open {
  opacity: 1;
  transform: scaleY(1) translateY(0);
  pointer-events: auto;
  transition: opacity 220ms ease-out, transform 220ms ease-out;
}
.phone__option {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 8px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 500;
  font-family: inherit;
  color: #17141a;
  cursor: pointer;
}
.phone__option-dial {
  margin-left: auto;
  font-variant-numeric: tabular-nums;
  opacity: 0.7;
}
.phone__option--active {
  background: rgba(47, 109, 246, 0.12);
}
.phone__option[aria-selected=true] {
  font-weight: 700;
  color: #2f6df6;
}

@media (prefers-reduced-motion: reduce) {
  .phone__listbox {
    transition: none !important;
  }
  .phone__trigger, .phone__input, .phone__chevron {
    transition: none;
  }
}

(function () {
  var COUNTRIES = {
    kr: { name: 'South Korea', flag: '🇰🇷', dial: '+82', groups: [3, 4, 4], sample: '1012345678' },
    us: { name: 'United States',     flag: '🇺🇸', dial: '+1',  groups: [3, 3, 4], sample: '2025551234' },
    jp: { name: 'Japan',     flag: '🇯🇵', dial: '+81', groups: [2, 4, 4], sample: '9012345678' }
  };
  var ORDER = ['kr', 'us', 'jp'];

  var wrap = document.getElementById('wrap');
  var trigger = document.getElementById('trigger');
  var listbox = document.getElementById('listbox');
  var input = document.getElementById('number');
  var options = Array.prototype.slice.call(listbox.querySelectorAll('.phone__option'));

  var current = 'kr';
  var active = 0;     // 키보드로 강조된 옵션 인덱스 (열려있을 때만 의미 있음)
  var open = false;
  var hideTimer = null;

  function maxDigits(code) {
    var g = COUNTRIES[code].groups, total = 0;
    for (var i = 0; i < g.length; i++) total += g[i];
    return total;
  }

  function formatDigits(digits, groups) {
    var out = [], i = 0;
    for (var g = 0; g < groups.length && i < digits.length; g++) {
      out.push(digits.slice(i, i + groups[g]));
      i += groups[g];
    }
    return out.join(' ');
  }

  function reformatInput() {
    var digits = input.value.replace(/\D/g, '').slice(0, maxDigits(current));
    input.value = formatDigits(digits, COUNTRIES[current].groups);
  }

  function highlight(i) {
    active = i;
    options.forEach(function (o, idx) { o.classList.toggle('phone__option--active', idx === i); });
    trigger.setAttribute('aria-activedescendant', options[i].id);
  }

  function openListbox() {
    if (open) return;
    open = true;
    clearTimeout(hideTimer);
    listbox.hidden = false;
    void listbox.offsetWidth;               // 강제 리플로우 — hidden 해제와 애니메이션을 분리
    listbox.classList.add('is-open');
    trigger.setAttribute('aria-expanded', 'true');
    highlight(ORDER.indexOf(current));
  }

  function closeListbox(returnFocus) {
    if (!open) return;
    open = false;
    listbox.classList.remove('is-open');
    trigger.setAttribute('aria-expanded', 'false');
    trigger.removeAttribute('aria-activedescendant');
    options.forEach(function (o) { o.classList.remove('phone__option--active'); });
    hideTimer = setTimeout(function () { if (!open) listbox.hidden = true; }, 220);
    if (returnFocus) trigger.focus({ preventScroll: true });
  }

  function selectCountry(code) {
    current = code;
    options.forEach(function (o) { o.setAttribute('aria-selected', String(o.dataset.code === code)); });
    var c = COUNTRIES[code];
    trigger.querySelector('.phone__flag').textContent = c.flag;
    trigger.querySelector('.phone__dial').textContent = c.dial;
    trigger.setAttribute('aria-label', 'Select country, currently ' + c.name);
    reformatInput();
  }

  trigger.addEventListener('click', function () {
    if (open) closeListbox(true); else openListbox();
  });

  trigger.addEventListener('keydown', function (e) {
    if (!open) {
      if (e.key === 'ArrowDown' || e.key === 'ArrowUp' || e.key === 'Enter' || e.key === ' ') {
        e.preventDefault();
        openListbox();
      }
      return;
    }
    if (e.key === 'ArrowDown') { e.preventDefault(); highlight((active + 1) % options.length); }
    else if (e.key === 'ArrowUp') { e.preventDefault(); highlight((active - 1 + options.length) % options.length); }
    else if (e.key === 'Enter') { e.preventDefault(); selectCountry(options[active].dataset.code); closeListbox(true); }
    else if (e.key === 'Escape') { e.preventDefault(); closeListbox(true); }
    else if (e.key === 'Tab') { closeListbox(false); }
  });

  options.forEach(function (o, idx) {
    o.addEventListener('click', function () { selectCountry(o.dataset.code); closeListbox(true); });
    o.addEventListener('pointerenter', function () { highlight(idx); });
  });

  document.addEventListener('pointerdown', function (e) {
    if (open && !wrap.contains(e.target)) closeListbox(false);
  });

  input.addEventListener('input', reformatInput);

  // ── 실사용자가 손대면 데모를 영구 정지 (캡처 단계 — 실제 동작을 막지 않는다) ──
  wrap.addEventListener('pointerdown', stopDemo, true);
  wrap.addEventListener('keydown', stopDemo, true);

  function stopDemo() {
    if (!wrap.classList.contains('is-demo')) return;
    wrap.classList.remove('is-demo');
    clearTimeout(demoTimer);
  }

  // ── 자동 데모 루프: 실제 코드 경로(openListbox·selectCountry·input 이벤트)를 그대로 돈다 ──
  var demoTimer = null;
  var orderIdx = 0;

  function typewrite(code, i, cb) {
    if (!wrap.classList.contains('is-demo')) return;
    var sample = COUNTRIES[code].sample;
    if (i <= sample.length) {
      input.value = formatDigits(sample.slice(0, i), COUNTRIES[code].groups);
      demoTimer = setTimeout(function () { typewrite(code, i + 1, cb); }, 90);
    } else {
      demoTimer = setTimeout(cb, 900);
    }
  }

  function demoStep() {
    if (!wrap.classList.contains('is-demo')) return;
    var code = ORDER[orderIdx % ORDER.length];
    orderIdx++;
    openListbox();
    highlight(ORDER.indexOf(code));
    demoTimer = setTimeout(function () {
      if (!wrap.classList.contains('is-demo')) return;
      selectCountry(code);
      closeListbox(false);
      demoTimer = setTimeout(function () {
        typewrite(code, 1, function () {
          input.value = '';
          demoTimer = setTimeout(demoStep, 260);
        });
      }, 260);
    }, 500);
  }

  demoTimer = setTimeout(demoStep, 500);
})();

import { useEffect, useRef, useState } from "react";
import styles from "./PhoneCountryInput.module.scss";

type CountryCode = "kr" | "us" | "jp";

type Country = {
  name: string;
  flag: string;
  dial: string;
  groups: number[];
};

const COUNTRIES: Record<CountryCode, Country> = {
  kr: { name: "대한민국", flag: "🇰🇷", dial: "+82", groups: [3, 4, 4] },
  us: { name: "미국", flag: "🇺🇸", dial: "+1", groups: [3, 3, 4] },
  jp: { name: "일본", flag: "🇯🇵", dial: "+81", groups: [2, 4, 4] },
};

const ORDER: CountryCode[] = ["kr", "us", "jp"];

function formatDigits(digits: string, groups: number[]): string {
  const out: string[] = [];
  let i = 0;
  for (let g = 0; g < groups.length && i < digits.length; g++) {
    out.push(digits.slice(i, i + groups[g]));
    i += groups[g];
  }
  return out.join(" ");
}

function maxDigits(groups: number[]): number {
  return groups.reduce((a, b) => a + b, 0);
}

export default function PhoneCountryInput() {
  const [country, setCountry] = useState<CountryCode>("kr");
  const [number, setNumber] = useState("");
  const [open, setOpen] = useState(false);
  const [active, setActive] = useState(0);
  const wrapRef = useRef<HTMLDivElement>(null);
  const triggerRef = useRef<HTMLButtonElement>(null);

  const current = COUNTRIES[country];

  const openList = () => {
    setActive(ORDER.indexOf(country));
    setOpen(true);
  };

  const closeList = (returnFocus: boolean) => {
    setOpen(false);
    if (returnFocus) triggerRef.current?.focus({ preventScroll: true });
  };

  const selectCountry = (code: CountryCode) => {
    setCountry(code);
    setNumber((prev) => {
      const digits = prev.replace(/\D/g, "").slice(0, maxDigits(COUNTRIES[code].groups));
      return formatDigits(digits, COUNTRIES[code].groups);
    });
  };

  const onNumberChange = (e: any) => {
    const digits = String(e.target.value).replace(/\D/g, "").slice(0, maxDigits(current.groups));
    setNumber(formatDigits(digits, current.groups));
  };

  const onTriggerKeyDown = (e: any) => {
    if (!open) {
      if (["ArrowDown", "ArrowUp", "Enter", " "].indexOf(e.key) !== -1) {
        e.preventDefault();
        openList();
      }
      return;
    }
    if (e.key === "ArrowDown") {
      e.preventDefault();
      setActive((a) => (a + 1) % ORDER.length);
    } else if (e.key === "ArrowUp") {
      e.preventDefault();
      setActive((a) => (a - 1 + ORDER.length) % ORDER.length);
    } else if (e.key === "Enter") {
      e.preventDefault();
      selectCountry(ORDER[active]);
      closeList(true);
    } else if (e.key === "Escape") {
      e.preventDefault();
      closeList(true);
    }
  };

  useEffect(() => {
    if (!open) return;
    const onDocPointerDown = (e: PointerEvent) => {
      if (wrapRef.current && !wrapRef.current.contains(e.target as Node)) closeList(false);
    };
    document.addEventListener("pointerdown", onDocPointerDown);
    return () => document.removeEventListener("pointerdown", onDocPointerDown);
  }, [open]);

  return (
    <div className={styles.phone} ref={wrapRef}>
      <span className={styles.label} id="phone-label">전화번호</span>
      <div className={styles.row}>
        <div className={styles.triggerWrap}>
          <button
            ref={triggerRef}
            type="button"
            className={styles.trigger}
            aria-haspopup="listbox"
            aria-expanded={open}
            aria-controls="phone-listbox"
            aria-activedescendant={open ? `phone-opt-${ORDER[active]}` : undefined}
            aria-label={`국가 선택, 현재 ${current.name}`}
            onClick={() => (open ? closeList(true) : openList())}
            onKeyDown={onTriggerKeyDown}
          >
            <span className={styles.flag} aria-hidden="true">{current.flag}</span>
            <span className={styles.dial}>{current.dial}</span>
            <span className={styles.chevron + (open ? " " + styles.chevronOpen : "")} aria-hidden="true" />
          </button>
          {open && (
            <ul className={styles.listbox} id="phone-listbox" role="listbox" aria-label="국가 목록">
              {ORDER.map((code, i) => (
                <li
                  key={code}
                  role="option"
                  id={`phone-opt-${code}`}
                  aria-selected={code === country}
                  className={styles.option + (i === active ? " " + styles.optionActive : "")}
                  onClick={() => {
                    selectCountry(code);
                    closeList(true);
                  }}
                  onPointerEnter={() => setActive(i)}
                >
                  <span aria-hidden="true">{COUNTRIES[code].flag}</span> {COUNTRIES[code].name}{" "}
                  <span className={styles.optionDial}>{COUNTRIES[code].dial}</span>
                </li>
              ))}
            </ul>
          )}
        </div>
        <input
          className={styles.input}
          type="text"
          inputMode="numeric"
          placeholder="10 1234 5678"
          aria-labelledby="phone-label"
          value={number}
          onChange={onNumberChange}
        />
      </div>
    </div>
  );
}