05Address autocomplete style input

<main class="stage">
  <div class="addr is-demo" id="wrap">
    <label class="addr__label" for="addr-input">Shipping address</label>
    <div class="addr__field">
      <input class="addr__input" id="addr-input" type="text" role="combobox"
             aria-expanded="false" aria-controls="addr-listbox" aria-autocomplete="list"
             aria-haspopup="listbox" aria-describedby="addr-hint" autocomplete="off"
             placeholder="Type an address">
      <ul class="addr__listbox" id="addr-listbox" role="listbox" aria-label="Address suggestions" hidden></ul>
    </div>
    <p class="addr__hint" id="addr-hint">Arrow keys to pick · Enter to fill in</p>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-quick;      // 후보 목록 열림 시간
$easing: $ease-out;
$color: $subject-mint;      // 밝고 상큼한 포인트 색 (어두운 무대 대비)

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

.addr {
  box-sizing: border-box;
  width: min(300px, 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;
  }

  &__field {
    position: relative;
  }

  &__input {
    box-sizing: border-box;
    width: 100%;
    border: 2px solid transparent;
    border-radius: $r-control;
    padding: $sp-3 $sp-4;
    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; }
  }

  &__listbox {
    position: absolute;
    top: calc(100% + #{$sp-1});
    left: 0;
    width: 100%;
    box-sizing: border-box;
    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: 입력창 아래변에서 펼침
    opacity: 0;
    transform: scaleY(.92) 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 {
    padding: $sp-2 $sp-3;
    border-radius: $r-xs;
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    color: $stage-ink;
    cursor: pointer;

    &--active { background: rgba($color, .28); }
  }

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

@media (prefers-reduced-motion: reduce) {
  .addr__listbox { transition: none !important; }
  .addr__input { transition: none; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.addr {
  box-sizing: border-box;
  width: min(300px, 88vw);
  background: #fff7e6;
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}
.addr__label {
  display: block;
  margin: 0 0 8px;
  font-weight: 700;
  font-size: 13px;
  line-height: 1;
  font-family: inherit;
  color: #17141a;
}
.addr__field {
  position: relative;
}
.addr__input {
  box-sizing: border-box;
  width: 100%;
  border: 2px solid transparent;
  border-radius: 12px;
  padding: 12px 16px;
  font-weight: 500;
  font-size: clamp(14px, 4.2vw, 16px);
  font-family: inherit;
  color: #17141a;
  background: #fff;
  transition: border-color 220ms ease-out;
}
.addr__input:focus {
  outline: none;
  border-color: #4cd4a6;
}
.addr__listbox {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  width: 100%;
  box-sizing: border-box;
  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(0.92) translateY(-4px);
  pointer-events: none;
}
.addr__listbox.is-open {
  opacity: 1;
  transform: scaleY(1) translateY(0);
  pointer-events: auto;
  transition: opacity 220ms ease-out, transform 220ms ease-out;
}
.addr__option {
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 500;
  font-family: inherit;
  color: #17141a;
  cursor: pointer;
}
.addr__option--active {
  background: rgba(76, 212, 166, 0.28);
}
.addr__hint {
  margin: 8px 0 0;
  font-size: 11px;
  line-height: 1.4;
  font-family: inherit;
  color: rgba(23, 20, 26, 0.72);
}

@media (prefers-reduced-motion: reduce) {
  .addr__listbox {
    transition: none !important;
  }
  .addr__input {
    transition: none;
  }
}

(function () {
  var ADDRESSES = [
    '14 Teheran-ro, Gangnam-gu, Seoul',
    '3 World Cup-ro, Mapo-gu, Seoul',
    '99 Centum-ro, Haeundae-gu, Busan',
    '7 Dongdaegu-ro, Suseong-gu, Daegu',
    '5 Convensia-daero, Yeonsu-gu, Incheon'
  ];

  var wrap = document.getElementById('wrap');
  var input = document.getElementById('addr-input');
  var listbox = document.getElementById('addr-listbox');

  var matches = [];
  var active = -1;      // -1 = 강조 없음 (입력한 글자 그대로)
  var open = false;
  var hideTimer = null;

  function render(list) {
    listbox.innerHTML = '';
    list.forEach(function (text, i) {
      var li = document.createElement('li');
      li.className = 'addr__option';
      li.id = 'addr-opt-' + i;
      li.setAttribute('role', 'option');
      li.setAttribute('aria-selected', 'false');
      li.textContent = text;
      li.addEventListener('click', function () { selectOption(i, true); });
      li.addEventListener('pointerenter', function () { setActive(i); });
      listbox.appendChild(li);
    });
  }

  function setActive(i) {
    active = i;
    var opts = listbox.querySelectorAll('.addr__option');
    opts.forEach(function (o, idx) {
      var on = idx === i;
      o.classList.toggle('addr__option--active', on);
      o.setAttribute('aria-selected', String(on));
    });
    if (i > -1 && opts[i]) input.setAttribute('aria-activedescendant', opts[i].id);
    else input.removeAttribute('aria-activedescendant');
  }

  function openList() {
    if (open) return;
    open = true;
    clearTimeout(hideTimer);
    listbox.hidden = false;
    void listbox.offsetWidth;
    listbox.classList.add('is-open');
    input.setAttribute('aria-expanded', 'true');
  }

  function closeList() {
    if (!open) return;
    open = false;
    listbox.classList.remove('is-open');
    input.setAttribute('aria-expanded', 'false');
    input.removeAttribute('aria-activedescendant');
    hideTimer = setTimeout(function () { if (!open) listbox.hidden = true; }, 220);
  }

  function selectOption(i, focusInput) {
    var text = matches[i];
    if (text === undefined) return;
    input.value = text;
    closeList();
    setActive(-1);
    matches = [];
    if (focusInput) input.focus({ preventScroll: true });
  }

  function filterAndRender(query) {
    matches = query ? ADDRESSES.filter(function (a) { return a.indexOf(query) > -1; }) : [];
    if (query && matches.length) {
      render(matches);
      setActive(-1);
      openList();
    } else {
      closeList();
    }
  }

  input.addEventListener('input', function () { filterAndRender(input.value.trim()); });

  input.addEventListener('keydown', function (e) {
    if (e.key === 'ArrowDown') {
      e.preventDefault();
      if (!open && matches.length) { openList(); setActive(0); return; }
      if (open && matches.length) setActive(Math.min(active + 1, matches.length - 1));
    } else if (e.key === 'ArrowUp') {
      e.preventDefault();
      if (open) { if (active <= 0) setActive(-1); else setActive(active - 1); }
    } else if (e.key === 'Enter') {
      if (open && active > -1) { e.preventDefault(); selectOption(active, true); }
    } else if (e.key === 'Escape') {
      if (open) { e.preventDefault(); closeList(); setActive(-1); }
    }
  });

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

  // ── 실사용자가 손대면 데모를 영구 정지 ──
  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: input 이벤트를 실제로 디스패치해 진짜 필터·선택 경로를 돈다 ──
  var demoTimer = null;
  var QUERIES = ['Seoul Gangnam', 'Busan Haeundae'];
  var qIdx = 0;

  function dispatchInput() {
    input.dispatchEvent(new Event('input', { bubbles: true }));
  }

  function typewrite(str, i, cb) {
    if (!wrap.classList.contains('is-demo')) return;
    if (i <= str.length) {
      input.value = str.slice(0, i);
      dispatchInput();
      demoTimer = setTimeout(function () { typewrite(str, i + 1, cb); }, 110);
    } else {
      demoTimer = setTimeout(cb, 500);
    }
  }

  function demoStep() {
    if (!wrap.classList.contains('is-demo')) return;
    var query = QUERIES[qIdx % QUERIES.length];
    qIdx++;
    typewrite(query, 1, function () {
      if (!wrap.classList.contains('is-demo')) return;
      if (matches.length) {
        setActive(0);
        demoTimer = setTimeout(function () {
          if (!wrap.classList.contains('is-demo')) return;
          selectOption(0, false);
          demoTimer = setTimeout(function () {
            if (!wrap.classList.contains('is-demo')) return;
            input.value = '';
            dispatchInput();
            demoTimer = setTimeout(demoStep, 400);
          }, 900);
        }, 450);
      } else {
        demoTimer = setTimeout(demoStep, 400);
      }
    });
  }

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

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

const ADDRESSES = [
  "서울 강남구 테헤란로 14",
  "서울 마포구 월드컵로 3",
  "부산 해운대구 센텀로 99",
  "대구 수성구 동대구로 7",
  "인천 연수구 컨벤시아대로 5",
];

export default function AddressAutocompleteInput() {
  const [value, setValue] = useState("");
  const [matches, setMatches] = useState<string[]>([]);
  const [active, setActive] = useState(-1);
  const [open, setOpen] = useState(false);
  const inputRef = useRef<HTMLInputElement>(null);
  const wrapRef = useRef<HTMLDivElement>(null);

  const filter = (query: string) => {
    const trimmed = query.trim();
    const next = trimmed ? ADDRESSES.filter((a) => a.indexOf(trimmed) > -1) : [];
    setMatches(next);
    setActive(-1);
    setOpen(Boolean(trimmed) && next.length > 0);
  };

  const onChange = (e: any) => {
    const v = String(e.target.value);
    setValue(v);
    filter(v);
  };

  const selectOption = (i: number) => {
    const text = matches[i];
    if (text === undefined) return;
    setValue(text);
    setOpen(false);
    setActive(-1);
    setMatches([]);
    inputRef.current?.focus({ preventScroll: true });
  };

  const onKeyDown = (e: any) => {
    if (e.key === "ArrowDown") {
      e.preventDefault();
      if (!open && matches.length) { setOpen(true); setActive(0); return; }
      if (open && matches.length) setActive((a) => Math.min(a + 1, matches.length - 1));
    } else if (e.key === "ArrowUp") {
      e.preventDefault();
      if (open) setActive((a) => (a <= 0 ? -1 : a - 1));
    } else if (e.key === "Enter") {
      if (open && active > -1) {
        e.preventDefault();
        selectOption(active);
      }
    } else if (e.key === "Escape") {
      if (open) {
        e.preventDefault();
        setOpen(false);
        setActive(-1);
      }
    }
  };

  const activeId = active > -1 ? `addr-opt-${active}` : undefined;

  return (
    <div className={styles.addr} ref={wrapRef}>
      <label className={styles.label} htmlFor="addr-input">배송지 주소</label>
      <div className={styles.field}>
        <input
          ref={inputRef}
          id="addr-input"
          className={styles.input}
          type="text"
          role="combobox"
          aria-expanded={open}
          aria-controls="addr-listbox"
          aria-autocomplete="list"
          aria-haspopup="listbox"
          aria-describedby="addr-hint"
          aria-activedescendant={activeId}
          autoComplete="off"
          placeholder="주소를 입력하세요"
          value={value}
          onChange={onChange}
          onKeyDown={onKeyDown}
          onBlur={() => setOpen(false)}
        />
        {open && matches.length > 0 && (
          <ul className={styles.listbox} id="addr-listbox" role="listbox" aria-label="주소 후보">
            {matches.map((text, i) => (
              <li
                key={text}
                id={`addr-opt-${i}`}
                role="option"
                aria-selected={i === active}
                className={styles.option + (i === active ? " " + styles.optionActive : "")}
                onMouseDown={(e: any) => e.preventDefault()}
                onClick={() => selectOption(i)}
                onPointerEnter={() => setActive(i)}
              >
                {text}
              </li>
            ))}
          </ul>
        )}
      </div>
      <p className={styles.hint} id="addr-hint">화살표 키로 고르고 Enter로 채우기</p>
    </div>
  );
}