Password rules + toggle Web Components

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</head>
<body>
<form id="signup-form" class="flow" onsubmit="return false;">
  <div class="input-wrapper">
    <label for="new-password">Password</label>
    <div class="password-input-wrapper">
      <input type="password" id="new-password" name="password" pattern="^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[\W_]).{9,}$" autocomplete="new-password">
      <div id="password-display-status" class="visually-hidden" aria-live="polite"></div>
      <password-toggle data-input-id="new-password" data-status-id="password-display-status">
        <button type="button">
          <span class="visually-hidden">Toggle password visibility</span>
          <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="currentColor" viewBox="0 0 256 256">
            <path d="M228,175a8,8,0,0,1-10.92-3l-19-33.2A123.23,123.23,0,0,1,162,155.46l5.87,35.22a8,8,0,0,1-6.58,9.21A8.4,8.4,0,0,1,160,200a8,8,0,0,1-7.88-6.69l-5.77-34.58a133.06,133.06,0,0,1-36.68,0l-5.77,34.58A8,8,0,0,1,96,200a8.4,8.4,0,0,1-1.32-.11,8,8,0,0,1-6.58-9.21L94,155.46a123.23,123.23,0,0,1-36.06-16.69L39,172A8,8,0,1,1,25.06,164l20-35a153.47,153.47,0,0,1-19.3-20A8,8,0,1,1,38.22,99c16.6,20.54,45.64,45,89.78,45s73.18-24.49,89.78-45A8,8,0,1,1,230.22,109a153.47,153.47,0,0,1-19.3,20l20,35A8,8,0,0,1,228,175Z"></path>
          </svg>
          <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="currentColor" viewBox="0 0 256 256">
            <path d="M247.31,124.76c-.35-.79-8.82-19.58-27.65-38.41C194.57,61.26,162.88,48,128,48S61.43,61.26,36.34,86.35C17.51,105.18,9,124,8.69,124.76a8,8,0,0,0,0,6.5c.35.79,8.82,19.57,27.65,38.4C61.43,194.74,93.12,208,128,208s66.57-13.26,91.66-38.34c18.83-18.83,27.3-37.61,27.65-38.4A8,8,0,0,0,247.31,124.76ZM128,192c-30.78,0-57.67-11.19-79.93-33.25A133.47,133.47,0,0,1,25,128,133.33,133.33,0,0,1,48.07,97.25C70.33,75.19,97.22,64,128,64s57.67,11.19,79.93,33.25A133.46,133.46,0,0,1,231.05,128C223.84,141.46,192.43,192,128,192Zm0-112a48,48,0,1,0,48,48A48.05,48.05,0,0,0,128,80Zm0,80a32,32,0,1,1,32-32A32,32,0,0,1,128,160Z"></path>
          </svg>
        </button>
      </password-toggle>
    </div>
    <password-rules data-input-id="new-password" data-rules=".{9}, .*\d, [\W_], [a-z], [A-Z]">
      <div class="password-rules__meter">
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <div class="password-rules__score"></div>
      </div>
      <ul class="password-rules__checklist flow">
        <li data-rule-index="0">Longer than 8 characters</li>
        <li data-rule-index="3">Includes a lowercase letter</li>
        <li data-rule-index="4">Includes an uppercase letter</li>
        <li data-rule-index="1">Includes a number</li>
        <li data-rule-index="2">Includes a special character</li>
      </ul>
    </password-rules>
  </div>
</form>
  <script  src="./script.js"></script>

</body>
</html>

CSS

.password-rules__meter {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  max-inline-size: 10rem;
}

.password-rules__meter > :where(span) {
  width: 100%;
  height: 0.25em;
  background-color: lightgray;
  border-radius: 360px;
  transition: background-color 100ms ease-out;
}

password-rules[data-score="1"] .password-rules__meter :first-child,
password-rules[data-score="2"] .password-rules__meter :nth-child(-n + 2),
password-rules[data-score="3"] .password-rules__meter :nth-child(-n + 3),
password-rules[data-score="4"] .password-rules__meter :nth-child(-n + 4) {
  background-color: dodgerblue;
}

password-rules[data-score="5"] .password-rules__meter :nth-child(-n + 5) {
  background-color: mediumseagreen;
}

.password-rules__score::before {
  display: block;
  counter-reset: score var(--score, 0) total var(--total, 5);
  content: counter(score) "/" counter(total);
  font-feature-settings: "tnum";
  font-size: 0.8em;
}

.password-rules__checklist {
  --flow: 0.3rem;
  -webkit-padding-start: 1.2em;
          padding-inline-start: 1.2em;
}

.password-rules__checklist li {
  position: relative;
  list-style-type: circle;
}

.password-rules__checklist .is-match::before {
  content: "✅";
  position: absolute;
  top: 0;
  right: calc(100% + 0.25em);
  font-size: 0.9em;
}

.password-input-wrapper {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
}
.password-input-wrapper button {
  display: grid;
  place-items: center;
}

.password-input-wrapper button svg:last-of-type {
  display: none;
}

.password-input-wrapper button[aria-pressed="true"] {
  svg:first-of-type {
    display: none;
  }
  svg:last-of-type {
    display: block;
  }
}

/* Base elements */
body {
  font-family: system-ui, sans-serif;
  color: CanvasText;
  background: Canvas;
}
form {
  width: min(30rem, 100% - 1rem);
  margin-inline: auto;
  margin-block: 4rem;
}

input {
  box-sizing: border-box;
  padding-inline: 0.5rem;
  width: 100%;
  border: 1px solid lightgray;
  border-radius: 0.25rem;
  box-shadow: 0 2px 6px -4px rgba(0 0 0 / 0.2);
}

button {
  all: unset;
  outline: revert;
  padding-inline: 1rem;
  background: linear-gradient(white, whitesmoke);

&:active {
    translate: 0 1px;
    box-shadow: none;
  }
}

:is(input, button) {
  font: inherit;
  padding-block: 0.5rem;
  border: 1px solid lightgray;
  border-radius: 0.25rem;
  box-shadow: 0 2px 6px -4px rgba(0 0 0 / 0.2);
}

/* Utils */
.flow > * + * {
  -webkit-margin-before: var(--flow, 1rem);
          margin-block-start: var(--flow, 1rem);
}

.visually-hidden {
  clip: rect(0 0 0 0);
  -webkit-clip-path: inset(50%);
          clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

.input-wrapper {
  display: grid;
  gap: 0.4rem;

label {
    justify-self: start;
  }
}

JS

class PasswordRules extends HTMLElement {
  connectedCallback() {
    this.input = document.getElementById(this.dataset.inputId);

if (!this.input) return;

this.rules = [];
    this.setupRules();
    this.input.addEventListener("input", this);
  }

handleEvent(e) {
    this.score = 0;

for (let [index, rule] of this.rules.entries()) {
      const match = e.target.value.match(rule);

if (match) this.score++;

this.toggleMatchedRuleClass(index, match);
    }

this.setAttributes("score", this.score);
  }

setAttributes(name, value) {
    this.dataset[name] = value;
    this.style.setProperty(`--${name}`, value);
  }

setupRules() {
    const rules = this.dataset.rules;

if (!rules) return;

rules.split(this.dataset.separator || ",").forEach((match) => {
      this.rules.push(new RegExp(match.trim()));
    });

this.setAttributes("total", this.rules.length);
  }

toggleMatchedRuleClass(index, value) {
    const el = this.querySelector(`[data-rule-index="${index}"]`);

if (!el) return;

el.classList.toggle("is-match", value);
  }
}

class PasswordToggle extends HTMLElement {
  connectedCallback() {
    this.input = document.getElementById(this.dataset.inputId);
    this.status = document.getElementById(this.dataset.statusId);
    this.btn = this.querySelector("button");

if (!this.input || !this.btn) return;

this.btn.ariaPressed = false;
    this.btn.ariaLabel = "Show password";
    this.btn.setAttribute("aria-controls", this.dataset.inputId);
    this.btn.addEventListener("click", this);
  }

handleEvent(e) {
    if (this.input.type === "password") {
      this.btn.ariaPressed = true;
      this.btn.ariaLabel = "Hide password";
      this.input.type = "text";

if (this.status) this.status.textContent = "Password is showing";
    } else {
      this.btn.ariaPressed = false;
      this.btn.ariaLabel = "Show password";
      this.input.type = "password";

if (this.status) this.status.textContent = "Password is hidden";
    }
  }
}

customElements.define("password-rules", PasswordRules);
customElements.define("password-toggle", PasswordToggle);

Password rules + toggle Web Components

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