Android L Ripple Click Effect with Javascript and CSS3

Just another approach to create a famous Android L & Google Material Design styled ripple effect using Javascript and CSS3. Created by idiotWu.

How to use it:

Creat an UI button that you want to apply a ripple effect when clicked on.

<button>BUTTON</button>

The sample CSS to style the UI button following  Material Design.

button {
  position: relative;
  display: block;
  width: 13em;
  height: 3em;
  margin: 2em;
  border: none;
  outline: none;
  letter-spacing: .2em;
  font-weight: bold;
  background: #dfdfdf;
  cursor: pointer;
  overflow: hidden;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  border-radius: 2px;
}

The required CSS rules to create the ripple effect using CSS3 animations.

.ripple {
  position: absolute;
  background: rgba(0,0,0,.25);
  border-radius: 100%;
  -webkit-transform: scale(0);
  -ms-transform: scale(0);
  transform: scale(0);
  pointer-events: none;
}
.ripple.show {
  -webkit-animation: ripple .5s ease-out;
  animation: ripple .5s ease-out;
}
@-webkit-keyframes 
ripple { to {
 -webkit-transform: scale(1.5);
 transform: scale(1.5);
 opacity: 0;
}
}
@keyframes 
ripple { to {
 -webkit-transform: scale(1.5);
 transform: scale(1.5);
 opacity: 0;
}
}

A little Javascript to enable the ripple effect.

var addRippleEffect = function (e) {
    var target = e.target;
    if (target.tagName.toLowerCase() !== 'button') return false;
    var rect = target.getBoundingClientRect();
    var ripple = target.querySelector('.ripple');
    if (!ripple) {
        ripple = document.createElement('span');
        ripple.className = 'ripple';
        ripple.style.height = ripple.style.width = Math.max(rect.width, rect.height) + 'px';
        target.appendChild(ripple);
    }
    ripple.classList.remove('show');
    var top = e.pageY - rect.top - ripple.offsetHeight / 2 - document.body.scrollTop;
    var left = e.pageX - rect.left - ripple.offsetWidth / 2 - document.body.scrollLeft;
    ripple.style.top = top + 'px';
    ripple.style.left = left + 'px';
    ripple.classList.add('show');
    return false;
}
document.addEventListener('click', addRippleEffect, false);