iOS Style Pin Code Validation With JavaScript And CSS3

A cool, animated, interactive pin code validator made with JavaScript and CSS / CSS3, similar to the iOS Passcode interface.

How to use it:

Create the html for the pin code validator.

<div id="pin">
  <div class="dots">
    <div class="dot"></div>
    <div class="dot"></div>
    <div class="dot"></div>
    <div class="dot"></div>
  </div>
  <p>Enter the password</p>
  <div class="numbers">
    <div class="number">1</div>
    <div class="number">2</div>
    <div class="number">3</div>
    <div class="number">4</div>
    <div class="number">5</div>
    <div class="number">6</div>
    <div class="number">7</div>
    <div class="number">8</div>
    <div class="number">9</div>
  </div>
</div>

The primary CSS / CSS3 styles.

body.wrong {
  -webkit-animation: bg-red 1s ease-in;
  animation: bg-red 1s ease-in;
}
body.correct {
  -webkit-animation: bg-green 1s ease-in;
  animation: bg-green 1s ease-in;
}
#pin {
  background: #212121;
  width: 20em;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  -ms-flex-direction: column;
  flex-direction: column;
  padding: 1em;
  border-radius: .3em;
  box-shadow: 4px 4px 8px rgba(0, 0, 0, 0.3);
  margin: auto;
  color: rgba(255, 255, 255, 0.2);
}
.dots {
  width: 50%;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-justify-content: space-around;
  -ms-flex-pack: distribute;
  justify-content: space-around;
  padding: 1em;
  padding-top: 3em;
}
.dot {
  position: relative;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 0.8em;
  width: 0.8em;
  height: 0.8em;
  -webkit-transform: scale3d(0.7, 0.7, 0.7);
  transform: scale3d(0.7, 0.7, 0.7);
}
.dot.active {
  -webkit-animation: growDot .5s ease;
  animation: growDot .5s ease;
  -webkit-animation-fill-mode: forwards;
  animation-fill-mode: forwards;
}
.dot.wrong {
  -webkit-animation: wrong .9s ease;
  animation: wrong .9s ease;
}
.dot.correct {
  -webkit-animation: correct .9s ease;
  animation: correct .9s ease;
}
#pin p { font-size: .8em; }
.numbers {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-flex-flow: row wrap;
  -ms-flex-flow: row wrap;
  flex-flow: row wrap;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-justify-content: space-around;
  -ms-flex-pack: distribute;
  justify-content: space-around;
  -webkit-align-content: flex-end;
  -ms-flex-line-pack: end;
  align-content: flex-end;
  margin: 2em 0;
}
.number {
  position: relative;
  width: 2.5em;
  height: 2.5em;
  margin: 0.5em;
  border-radius: 2.5em;
  border: 2px solid rgba(255, 255, 255, 0);
  text-align: center;
  line-height: 2.5em;
  font-weight: 400;
  font-size: 1.8em;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-transition: all .5s ease;
  transition: all .5s ease;
}
.number:hover { color: rgba(255, 255, 255, 0.5); }
.number:hover:before { border: 2px solid rgba(255, 255, 255, 0.5); }
.number:before {
  content: "";
  position: absolute;
  left: -2px;
  width: 2.5em;
  height: 2.5em;
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: 2.5em;
  -webkit-transition: all .5s ease;
  transition: all .5s ease;
}
.number.grow:before {
  -webkit-animation: grow .6s ease;
  animation: grow .6s ease;
}

The CSS3 animations.

@-webkit-keyframes 
growDot {  100% {
 background: white;
 -webkit-transform: scale3d(0.9, 0.9, 0.9);
 transform: scale3d(0.9, 0.9, 0.9);
}
}
@keyframes 
growDot {  100% {
 background: white;
 -webkit-transform: scale3d(0.9, 0.9, 0.9);
 transform: scale3d(0.9, 0.9, 0.9);
}
}
@-webkit-keyframes 
grow {  50% {
 -webkit-transform: scale3d(1.5, 1.5, 1.5);
 transform: scale3d(1.5, 1.5, 1.5);
}
 100% {
 -webkit-transform: scale3d(1, 1, 1);
 transform: scale3d(1, 1, 1);
}
}
@keyframes 
grow {  50% {
 -webkit-transform: scale3d(1.5, 1.5, 1.5);
 transform: scale3d(1.5, 1.5, 1.5);
}
 100% {
 -webkit-transform: scale3d(1, 1, 1);
 transform: scale3d(1, 1, 1);
}
}
@-webkit-keyframes 
wrong {  20% {
 background: crimson;
}
 40% {
 -webkit-transform: translate(-15px, 0);
 transform: translate(-15px, 0);
}
 60% {
 -webkit-transform: translate(10px, 0);
 transform: translate(10px, 0);
}
 80% {
 -webkit-transform: translate(-5px, 0);
 transform: translate(-5px, 0);
}
}
@keyframes 
wrong {  20% {
 background: crimson;
}
 40% {
 -webkit-transform: translate(-15px, 0);
 transform: translate(-15px, 0);
}
 60% {
 -webkit-transform: translate(10px, 0);
 transform: translate(10px, 0);
}
 80% {
 -webkit-transform: translate(-5px, 0);
 transform: translate(-5px, 0);
}
}
@-webkit-keyframes 
correct {  20% {
 background: limegreen;
}
 40% {
 -webkit-transform: translate(0, -15px);
 transform: translate(0, -15px);
}
 60% {
 -webkit-transform: translate(0, 10px);
 transform: translate(0, 10px);
}
 80% {
 -webkit-transform: translate(0, -5px);
 transform: translate(0, -5px);
}
}
@keyframes 
correct {  20% {
 background: limegreen;
}
 40% {
 -webkit-transform: translate(0, -15px);
 transform: translate(0, -15px);
}
 60% {
 -webkit-transform: translate(0, 10px);
 transform: translate(0, 10px);
}
 80% {
 -webkit-transform: translate(0, -5px);
 transform: translate(0, -5px);
}
}
@-webkit-keyframes 
bg-red {  50% {
 background: crimson;
}
}
@keyframes 
bg-red {  50% {
 background: crimson;
}
}
@-webkit-keyframes 
bg-green {  50% {
 background: limegreen;
}
}
@keyframes 
bg-green {  50% {
 background: limegreen;
}
}

The core JavaScript to active the pin code validator.

(function() {
  var input   = "",
    correct = "1593"; // pin code
  
  var dots    = document.querySelectorAll(".dot"), 
    numbers = document.querySelectorAll(".number");
    dots    = Array.prototype.slice.call(dots);
    numbers = Array.prototype.slice.call(numbers);
  
  numbers.forEach(function(number, index) {
    number.addEventListener('click', function() {
      number.className += ' grow';
      input += (index+1);
      dots[input.length-1].className += ' active';
      if(input.length >= 4) {
        if(input !== correct) {
          dots.forEach(function(dot, index) {
            dot.className += " wrong";
          });
          document.body.className += " wrong";
        }
        else {
          dots.forEach(function(dot, index) {
            dot.className += " correct";
          });
          document.body.className += " correct";
        }
        setTimeout(function() {
          dots.forEach(function(dot, index) {
            dot.className = "dot";
          });
          input = "";
        }, 900);
        setTimeout(function() {
          document.body.className = "";
        }, 1000);
      }
      setTimeout(function() {
        number.className = 'number';
      }, 1000);
    });
  });
})();