08Fields that shake when submit catches them

<main class="stage">
  <form class="sk is-demo" id="sk" novalidate>
    <div class="sk__row" data-row="1">
      <label class="sk__label" for="sk-a">Email</label>
      <span class="sk__box">
        <input class="sk__input" id="sk-a" type="email" autocomplete="off" required>
        <span class="sk__ghost" aria-hidden="true">[email protected]</span>
      </span>
    </div>
    <div class="sk__row" data-row="2">
      <label class="sk__label" for="sk-b">Phone</label>
      <span class="sk__box">
        <input class="sk__input" id="sk-b" type="tel" autocomplete="off" required>
        <span class="sk__ghost" aria-hidden="true">010-1234-5678</span>
      </span>
    </div>
    <button class="sk__btn" type="submit">Sign up</button>
    <p class="sk__say" id="sk-say" role="status" aria-live="polite">Fill in both fields</p>
  </form>
</main>

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

$duration: $dur-base;
$easing: cubic-bezier(.36, .07, .19, .97);
$color: $subject-blue;

@include stage($stage-paper);

$ok: #479076;

.sk {
  box-sizing: border-box;
  width: min(300px, 86vw);
  display: flex;
  flex-direction: column;
  gap: $sp-2;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.sk__row {
  display: flex;
  align-items: center;
  gap: $sp-2;
}
.sk__label {
  flex: 0 0 auto;
  width: 48px;
  color: rgba(23, 20, 26, .72);
  font-size: 11px; line-height: 14px; font-weight: 700;
  transition: color $dur-quick $ease-out;
}
.sk__row.is-bad .sk__label { color: $error; }
.sk__row.is-ok .sk__label  { color: $ok; }

.sk__box {
  position: relative;
  flex: 1 1 auto;
  display: block;
}
.sk__ghost {
  position: absolute;
  left: 14px; top: 0;
  color: $subject-ink;
  font-size: 13px; line-height: 34px; font-weight: 700;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
}
.sk__input {
  box-sizing: border-box;
  display: block;
  width: 100%; height: 34px;
  padding: 0 $sp-3;
  border: 2px solid rgba(23, 20, 26, .2);
  border-radius: $r-control;
  background: $stage-paper;
  color: $subject-ink;
  font-family: inherit;
  font-size: 13px; line-height: 30px; font-weight: 700;
  transition: border-color $dur-quick $ease-out;
}
.sk__input:focus-visible { outline: 2px solid $color; outline-offset: 2px; }
.sk__row.is-bad .sk__input { border-color: $error; background: $error-soft; }
.sk__row.is-ok .sk__input  { border-color: $ok; }

// 비어 있는 칸만 좌우로 흔든다 — 한 번만 돌고 멈춘다
.sk__row.is-bad {
  animation-name: sk-shake;
  animation-duration: $duration;
  animation-timing-function: $easing;
  animation-iteration-count: 1;
}

.sk__btn {
  height: 34px;
  border: 0;
  border-radius: $r-control;
  background: $subject-ink;
  color: $subject-cream;
  font-family: inherit;
  font-size: 13px; line-height: 34px; font-weight: 700;
  cursor: pointer;
  transition: transform $dur-instant $ease-out;
}
.sk__btn:focus-visible { outline: 2px solid $color; outline-offset: 2px; }
.sk__btn:active { transform: scale(.97); }

.sk__say {
  // 흔들리는 칸이 눈으로 말해 주는 것을 낭독기에도 같은 뜻으로 보낸다
  position: absolute;
  width: 1px; height: 1px;
  margin: 0;
  overflow: hidden;
  clip-path: inset(50%);
}

// ── 자동 루프 (2s) ────────────────────────────────────
// 0~24% 빈 폼 → 26% 버튼 눌림 → 28·30% 두 줄이 차례로 흔들리며 오류로 켜짐
// → 56% 위 칸 채움 · 64% 아래 칸 채움(두 줄 다 확정 색) → 84·88% 흩어서 복귀.
// 흔들림은 translateX 라 레이아웃을 다시 계산하지 않는다.
.sk.is-demo .sk__row {
  animation-duration: $dur-loop;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
.sk.is-demo .sk__row[data-row="1"] { animation-name: sk-row-1; }
.sk.is-demo .sk__row[data-row="2"] { animation-name: sk-row-2; }
.sk.is-demo .sk__label,
.sk.is-demo .sk__input {
  transition: none;
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.sk.is-demo .sk__row[data-row="1"] .sk__label { animation-name: sk-lb-1; }
.sk.is-demo .sk__row[data-row="2"] .sk__label { animation-name: sk-lb-2; }
.sk.is-demo .sk__row[data-row="1"] .sk__input { animation-name: sk-in-1; }
.sk.is-demo .sk__row[data-row="2"] .sk__input { animation-name: sk-in-2; }
.sk.is-demo .sk__ghost {
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.sk.is-demo .sk__row[data-row="1"] .sk__ghost { animation-name: sk-gh-1; }
.sk.is-demo .sk__row[data-row="2"] .sk__ghost { animation-name: sk-gh-2; }
.sk.is-demo .sk__btn {
  transition: none;
  animation-name: sk-btn;
  animation-duration: $dur-loop;
  animation-timing-function: $ease-out;
  animation-iteration-count: infinite;
}

@keyframes sk-shake {
  0%, 100% { transform: translateX(0); }
  20%      { transform: translateX(-6px); }
  40%      { transform: translateX(6px); }
  60%      { transform: translateX(-4px); }
  80%      { transform: translateX(2px); }
}
@keyframes sk-row-1 {
  0%   { transform: translateX(0); }
  28%  { transform: translateX(0); }
  31%  { transform: translateX(-6px); }
  34%  { transform: translateX(6px); }
  37%  { transform: translateX(-4px); }
  40%  { transform: translateX(2px); }
  43%  { transform: translateX(0); }
  100% { transform: translateX(0); }
}
@keyframes sk-row-2 {
  0%   { transform: translateX(0); }
  30%  { transform: translateX(0); }
  33%  { transform: translateX(-6px); }
  36%  { transform: translateX(6px); }
  39%  { transform: translateX(-4px); }
  42%  { transform: translateX(2px); }
  45%  { transform: translateX(0); }
  100% { transform: translateX(0); }
}
@keyframes sk-lb-1 {
  0%   { color: rgba(23, 20, 26, .72); }
  28%  { color: $error; }
  56%  { color: $ok; }
  84%  { color: rgba(23, 20, 26, .72); }
  100% { color: rgba(23, 20, 26, .72); }
}
@keyframes sk-lb-2 {
  0%   { color: rgba(23, 20, 26, .72); }
  30%  { color: $error; }
  64%  { color: $ok; }
  88%  { color: rgba(23, 20, 26, .72); }
  100% { color: rgba(23, 20, 26, .72); }
}
@keyframes sk-in-1 {
  0%   { border-color: rgba(23, 20, 26, .2); background: $stage-paper; }
  28%  { border-color: $error; background: $error-soft; }
  56%  { border-color: $ok; background: $stage-paper; }
  84%  { border-color: rgba(23, 20, 26, .2); background: $stage-paper; }
  100% { border-color: rgba(23, 20, 26, .2); background: $stage-paper; }
}
@keyframes sk-in-2 {
  0%   { border-color: rgba(23, 20, 26, .2); background: $stage-paper; }
  30%  { border-color: $error; background: $error-soft; }
  64%  { border-color: $ok; background: $stage-paper; }
  88%  { border-color: rgba(23, 20, 26, .2); background: $stage-paper; }
  100% { border-color: rgba(23, 20, 26, .2); background: $stage-paper; }
}
@keyframes sk-gh-1 {
  0%   { opacity: 0; }
  56%  { opacity: 1; }
  84%  { opacity: 0; }
  100% { opacity: 0; }
}
@keyframes sk-gh-2 {
  0%   { opacity: 0; }
  64%  { opacity: 1; }
  88%  { opacity: 0; }
  100% { opacity: 0; }
}
@keyframes sk-btn {
  0%   { transform: scale(1); }
  24%  { transform: scale(1); }
  26%  { transform: scale(.97); }
  30%  { transform: scale(1); }
  100% { transform: scale(1); }
}

// 320×200 — 무대 여백을 뺀 174px 안에 들어가도록 간격을 내린다(올리지 않는다)
@media (max-width: 360px) {
  .sk { gap: $sp-1; }
  .sk__label { width: 40px; }
  .sk__input, .sk__btn { height: 32px; }
  .sk__ghost { line-height: 32px; }
  .sk__btn { line-height: 32px; }
  .sk__input { line-height: 28px; }
}

@media (prefers-reduced-motion: reduce) {
  .sk.is-demo .sk__row,
  .sk.is-demo .sk__label,
  .sk.is-demo .sk__input,
  .sk.is-demo .sk__btn,
  .sk.is-demo .sk__ghost,
  .sk__row.is-bad { animation: none !important; }
  .sk.is-demo .sk__label { color: $error; }
  .sk.is-demo .sk__input { border-color: $error; background: $error-soft; }
  .sk__label, .sk__input, .sk__btn { 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);
}

.sk {
  box-sizing: border-box;
  width: min(300px, 86vw);
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.sk__row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sk__label {
  flex: 0 0 auto;
  width: 48px;
  color: rgba(23, 20, 26, 0.72);
  font-size: 11px;
  line-height: 14px;
  font-weight: 700;
  transition: color 220ms ease-out;
}

.sk__row.is-bad .sk__label {
  color: #c2361a;
}

.sk__row.is-ok .sk__label {
  color: #479076;
}

.sk__box {
  position: relative;
  flex: 1 1 auto;
  display: block;
}

.sk__ghost {
  position: absolute;
  left: 14px;
  top: 0;
  color: #17141a;
  font-size: 13px;
  line-height: 34px;
  font-weight: 700;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
}

.sk__input {
  box-sizing: border-box;
  display: block;
  width: 100%;
  height: 34px;
  padding: 0 12px;
  border: 2px solid rgba(23, 20, 26, 0.2);
  border-radius: 12px;
  background: #ffffff;
  color: #17141a;
  font-family: inherit;
  font-size: 13px;
  line-height: 30px;
  font-weight: 700;
  transition: border-color 220ms ease-out;
}

.sk__input:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: 2px;
}

.sk__row.is-bad .sk__input {
  border-color: #c2361a;
  background: #ffe0d8;
}

.sk__row.is-ok .sk__input {
  border-color: #479076;
}

.sk__row.is-bad {
  animation-name: sk-shake;
  animation-duration: 300ms;
  animation-timing-function: cubic-bezier(0.36, 0.07, 0.19, 0.97);
  animation-iteration-count: 1;
}

.sk__btn {
  height: 34px;
  border: 0;
  border-radius: 12px;
  background: #17141a;
  color: #fff7e6;
  font-family: inherit;
  font-size: 13px;
  line-height: 34px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 140ms ease-out;
}

.sk__btn:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: 2px;
}

.sk__btn:active {
  transform: scale(0.97);
}

.sk__say {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  overflow: hidden;
  clip-path: inset(50%);
}

.sk.is-demo .sk__row {
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.36, 0.07, 0.19, 0.97);
  animation-iteration-count: infinite;
}

.sk.is-demo .sk__row[data-row="1"] {
  animation-name: sk-row-1;
}

.sk.is-demo .sk__row[data-row="2"] {
  animation-name: sk-row-2;
}

.sk.is-demo .sk__label,
.sk.is-demo .sk__input {
  transition: none;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

.sk.is-demo .sk__row[data-row="1"] .sk__label {
  animation-name: sk-lb-1;
}

.sk.is-demo .sk__row[data-row="2"] .sk__label {
  animation-name: sk-lb-2;
}

.sk.is-demo .sk__row[data-row="1"] .sk__input {
  animation-name: sk-in-1;
}

.sk.is-demo .sk__row[data-row="2"] .sk__input {
  animation-name: sk-in-2;
}

.sk.is-demo .sk__ghost {
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

.sk.is-demo .sk__row[data-row="1"] .sk__ghost {
  animation-name: sk-gh-1;
}

.sk.is-demo .sk__row[data-row="2"] .sk__ghost {
  animation-name: sk-gh-2;
}

.sk.is-demo .sk__btn {
  transition: none;
  animation-name: sk-btn;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
}

@keyframes sk-shake {
  0%, 100% {
    transform: translateX(0);
  }
  20% {
    transform: translateX(-6px);
  }
  40% {
    transform: translateX(6px);
  }
  60% {
    transform: translateX(-4px);
  }
  80% {
    transform: translateX(2px);
  }
}
@keyframes sk-row-1 {
  0% {
    transform: translateX(0);
  }
  28% {
    transform: translateX(0);
  }
  31% {
    transform: translateX(-6px);
  }
  34% {
    transform: translateX(6px);
  }
  37% {
    transform: translateX(-4px);
  }
  40% {
    transform: translateX(2px);
  }
  43% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(0);
  }
}
@keyframes sk-row-2 {
  0% {
    transform: translateX(0);
  }
  30% {
    transform: translateX(0);
  }
  33% {
    transform: translateX(-6px);
  }
  36% {
    transform: translateX(6px);
  }
  39% {
    transform: translateX(-4px);
  }
  42% {
    transform: translateX(2px);
  }
  45% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(0);
  }
}
@keyframes sk-lb-1 {
  0% {
    color: rgba(23, 20, 26, 0.72);
  }
  28% {
    color: #c2361a;
  }
  56% {
    color: #479076;
  }
  84% {
    color: rgba(23, 20, 26, 0.72);
  }
  100% {
    color: rgba(23, 20, 26, 0.72);
  }
}
@keyframes sk-lb-2 {
  0% {
    color: rgba(23, 20, 26, 0.72);
  }
  30% {
    color: #c2361a;
  }
  64% {
    color: #479076;
  }
  88% {
    color: rgba(23, 20, 26, 0.72);
  }
  100% {
    color: rgba(23, 20, 26, 0.72);
  }
}
@keyframes sk-in-1 {
  0% {
    border-color: rgba(23, 20, 26, 0.2);
    background: #ffffff;
  }
  28% {
    border-color: #c2361a;
    background: #ffe0d8;
  }
  56% {
    border-color: #479076;
    background: #ffffff;
  }
  84% {
    border-color: rgba(23, 20, 26, 0.2);
    background: #ffffff;
  }
  100% {
    border-color: rgba(23, 20, 26, 0.2);
    background: #ffffff;
  }
}
@keyframes sk-in-2 {
  0% {
    border-color: rgba(23, 20, 26, 0.2);
    background: #ffffff;
  }
  30% {
    border-color: #c2361a;
    background: #ffe0d8;
  }
  64% {
    border-color: #479076;
    background: #ffffff;
  }
  88% {
    border-color: rgba(23, 20, 26, 0.2);
    background: #ffffff;
  }
  100% {
    border-color: rgba(23, 20, 26, 0.2);
    background: #ffffff;
  }
}
@keyframes sk-gh-1 {
  0% {
    opacity: 0;
  }
  56% {
    opacity: 1;
  }
  84% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}
@keyframes sk-gh-2 {
  0% {
    opacity: 0;
  }
  64% {
    opacity: 1;
  }
  88% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}
@keyframes sk-btn {
  0% {
    transform: scale(1);
  }
  24% {
    transform: scale(1);
  }
  26% {
    transform: scale(0.97);
  }
  30% {
    transform: scale(1);
  }
  100% {
    transform: scale(1);
  }
}
@media (max-width: 360px) {
  .sk {
    gap: 4px;
  }
  .sk__label {
    width: 40px;
  }
  .sk__input, .sk__btn {
    height: 32px;
  }
  .sk__ghost {
    line-height: 32px;
  }
  .sk__btn {
    line-height: 32px;
  }
  .sk__input {
    line-height: 28px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .sk.is-demo .sk__row,
  .sk.is-demo .sk__label,
  .sk.is-demo .sk__input,
  .sk.is-demo .sk__btn,
  .sk.is-demo .sk__ghost,
  .sk__row.is-bad {
    animation: none !important;
  }
  .sk.is-demo .sk__label {
    color: #c2361a;
  }
  .sk.is-demo .sk__input {
    border-color: #c2361a;
    background: #ffe0d8;
  }
  .sk__label, .sk__input, .sk__btn {
    transition: none;
  }
}

// 실제 동작: 제출을 눌러야 검사한다. 비어 있는 칸만 흔들리고 라벨이 켜지며, 다 채우면 같은 라벨이 확정 색으로 넘어간다.
var sk = document.getElementById('sk');
var skSay = document.getElementById('sk-say');
var skRows = [].slice.call(document.querySelectorAll('.sk__row'));
sk.addEventListener('submit', function (e) {
  e.preventDefault();
  sk.classList.remove('is-demo'); // 사람이 손대면 자동 루프를 멈춘다
  var bad = 0;
  skRows.forEach(function (row) {
    var input = row.querySelector('.sk__input');
    var empty = input.value.trim().length === 0;
    input.setAttribute('aria-invalid', empty ? 'true' : 'false');
    row.classList.toggle('is-ok', !empty);
    row.classList.remove('is-bad');
    if (empty) {
      void row.offsetWidth;           // 리플로를 강제해야 같은 흔들림이 다시 돈다
      row.classList.add('is-bad');
      bad += 1;
    }
  });
  skSay.textContent = bad ? bad + ' field(s) still empty' : 'Both fields are filled in';
});

import { useState } from "react";
import type { CSSProperties } from "react";
import styles from "./SubmitShakeLabel.module.scss";

export type ShakeField = { label: string; type: string; sample: string };

export type SubmitShakeLabelProps = {
  fields?: ShakeField[];
  submitLabel?: string;
  /** 자동 재생 루프 (갤러리용). 사람이 손대면 꺼진다 */
  demo?: boolean;
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type ChangeEvt = { target: { value: string } };

const DEFAULT_FIELDS: ShakeField[] = [
  { label: "Email", type: "email", sample: "[email protected]" },
  { label: "Phone", type: "tel", sample: "010-1234-5678" },
];

export default function SubmitShakeLabel({
  fields = DEFAULT_FIELDS,
  submitLabel = "Sign up",
  demo = true,
  duration = 300,
  easing = "cubic-bezier(.36,.07,.19,.97)",
  color = "#2f6df6",
}: SubmitShakeLabelProps) {
  const [values, setValues] = useState<string[]>(fields.map(() => ""));
  const [tries, setTries] = useState(0);
  const [live, setLive] = useState(demo);

  const empty = values.map((v) => v.trim().length === 0);
  const badCount = empty.filter(Boolean).length;
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  function set(i: number, v: string) {
    setLive(false);
    setValues((prev) => prev.map((old, k) => (k === i ? v : old)));
  }

  return (
    <form
      className={`${styles.root} ${live ? styles.isDemo : ""}`}
      style={vars}
      noValidate
      onSubmit={(e: { preventDefault: () => void }) => { e.preventDefault(); setLive(false); setTries((n) => n + 1); }}
    >
      {fields.map((f, i) => (
        // key 에 시도 횟수를 섞어 두면 같은 칸이 다시 마운트되어 흔들림이 매번 새로 돈다
        <div
          key={`${f.label}-${tries}`}
          className={`${styles.row} ${tries && empty[i] ? styles.isBad : ""} ${tries && !empty[i] ? styles.isOk : ""}`}
          data-row={i + 1}
        >
          <label className={styles.label} htmlFor={`sk-${i}`}>{f.label}</label>
          <span className={styles.box}>
            <input
              className={styles.input}
              id={`sk-${i}`}
              type={f.type}
              autoComplete="off"
              required
              aria-invalid={tries > 0 && empty[i]}
              value={values[i]}
              onChange={(e: ChangeEvt) => set(i, e.target.value)}
            />
            <span className={styles.ghost} aria-hidden="true">{f.sample}</span>
          </span>
        </div>
      ))}
      <button className={styles.btn} type="submit">{submitLabel}</button>
      <p className={styles.say} role="status" aria-live="polite">
        {tries === 0 ? "Fill in both fields" : badCount ? `${badCount} field(s) still empty` : "Both fields are filled"}
      </p>
    </form>
  );
}