Password Validation with JavaScript

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Demo

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Code

HTML

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title>Password Validation with JavaScript</title>
    <link rel="stylesheet" type="text/css" href="style.css">
    <link rel="stylesheet" type="text/css" href="https://demo.plantpot.works/assets/css/normalize.css">
    <link href="https://use.fontawesome.com/releases/v5.6.1/css/all.css" rel="stylesheet">
    <link rel="stylesheet" href="https://use.typekit.net/opg3wle.css">
    <link rel="stylesheet" type="text/css" href="style.css">
    <script src="password_validation.js"></script>
  </head>
  <body>
    <div id="container">
      <div class="form-box">
        <form id="form" name="form" action="#" method="post">
          <div class="form-input-box">
            <label class="form-label" for="password">Password<span class="form-required"> *</span></label>
            <div class="form-element">
              <input id="password" class="form-input" type="password" name="password" placeholder="Enter password" oninput="password_validation()" required>
              <label class="switch">
                <input class="password-toggle" type="checkbox" name="checkbox" onchange="changeType()">
                <span class="icon-eye">
                  <i class="fas fa-eye"></i>
                  <i class="fas fa-eye-slash"></i>
                </span>
              </label>
            </div>
            <div class="strength"><span class="percentage"></span></div>
            <p id="msg" class="msg">Poor</p>
            <ul class="password-policies">
              <li class="lowercase">Lowercase</li>
              <li class="uppercase">Uppercase</li>
              <li class="numbers">Numbers</li>
              <li class="symbols">Symbols</li>
              <li class="length">At least 12 characters</li>
            </ul>
          </div>
        </form>
      </div>
    </div>
  </body>
</html>

CSS

@charset "utf-8";
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  font-size: 16px;
}
body {
  background-color: #f5f6e7;
  font-family: futura-pt, sans-serif;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
}
ul {
  list-style-type: none;
}
#container {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  width: 100%;
  height: 100vh;
}
.form-box {
  width: 100%;
  max-width: 450px;
  padding: 10px;
}
.form-label {
  display: inline-block;
  margin: .5rem 0;
  color: #3d3935;
  font-size: 1rem;
  letter-spacing: .2px;
}
.form-required {
  color: #bf0404;
}
.form-element {
  position: relative;
}
.form-input {
  width: 100%;
  padding: 15px 10px;
  border: 1px solid #23b08d;
  border-radius: 4px;
  background-color: #fff;
  color: #3d3935;
  font-size: 1rem;
  outline: 0;
}
.form-input::placeholder {
  color: #ccc;
  font-size: 1rem;
}
.switch {
  display: inline-block;
  position: absolute;
  top: 15px;
  right: 10px;
  background-color: #fff;
}
.form-element .password-toggle {
  display: none;
}
.form-element .icon-eye {
  cursor: pointer;
}
.form-element .password-toggle:not(:checked) + .icon-eye .fa-eye-slash {
  display: none;
}
.form-element .password-toggle:checked + .icon-eye .fa-eye {
  display: none;
}
.password-policies li {
  padding: 5px 25px;
  color: #ccc;
  background-image: url(inactive.svg);
  background-position: 0 center;
  background-size: 20px 20px;
  background-repeat: no-repeat;
}
.password-policies li.active {
  color: #23b08d;
  background-image: url(active.svg);
  background-position: 0 center;
  background-size: 20px 20px;
  background-repeat: no-repeat;
}
.strength {
  position: relative;
  height: 8px;
  margin: 10px 0 5px;
  border-radius: 4px;
  background-color: #fff;
  transition: .5s;
}
.percentage {
  position: absolute;
  height: 8px;
  border-radius: 4px;
  background-color: #23b08d;
  content: '';
}
.msg {
  padding-right: 5px;
  color: #3d3935;
  font-size: 1rem;
  text-align: right;
}
@media screen and (max-width: 480px) {
  #container {
    height: auto;
    align-items: flex-start;
  }
}

JavaScript

function changeType() {
  var toggle = document.form.checkbox;
  var password = document.getElementById("password");

  if(toggle.checked) {
    password.setAttribute("type", "text");
  }
  else {
    password.setAttribute("type", "password");
  }
}

function password_validation() {
  var form = document.getElementById("form");
  var password = document.getElementById("password").value;
  var msg = document.getElementById("msg");

  var patternLowercase = /[a-z]/;
  var patternUppercase = /[A-Z]/;
  var patternNumbers = /[\d]/;
  var patternSymbols = /[!-/:-@[-`{-~]/;

  var length = document.getElementsByClassName("length");
  var lowercase = document.getElementsByClassName("lowercase");
  var uppercase = document.getElementsByClassName("uppercase");
  var numbers = document.getElementsByClassName("numbers");
  var symbols = document.getElementsByClassName("symbols");

  if(password.length >= 12) {
    length[0].classList.add("active");
  }
  else {
    length[0].classList.remove("active");
  }

  if(patternLowercase.test(password)) {
    lowercase[0].classList.add("active");
  }
  else {
    lowercase[0].classList.remove("active");
  }

  if(patternUppercase.test(password)) {
    uppercase[0].classList.add("active");
  }
  else {
    uppercase[0].classList.remove("active");
  }

  if(patternNumbers.test(password)) {
    numbers[0].classList.add("active");
  }
  else {
    numbers[0].classList.remove("active");
  }

  if(patternSymbols.test(password)) {
    symbols[0].classList.add("active");
  }
  else {
    symbols[0].classList.remove("active");
  }

  var active = document.getElementsByClassName("active");
  var percentage = document.getElementsByClassName("percentage");
  percentage[0].setAttribute("style", "width: " + active.length/5*100 + "%");

  if(active.length <= 1) {
    msg.innerHTML = "Poor";
  }
  else if(active.length == 2) {
    msg.innerHTML = "Weak";
  }
  else if(active.length == 3) {
    msg.innerHTML = "Midium";
  }
  else if(active.length == 4) {
    msg.innerHTML = "Good";
  }
  else {
    msg.innerHTML = "Strong";
  }
}