Flexbox slider

flexbox-slider.markdown

Flexbox slider

Little slider built with flexbox. Somewhat responsive, and can have fixed elements alongside the slider area.

A Pen by Cian Butler on CodePen.

License.

index.html

<div class="slider">
  <button onclick="prev()">&laquo;</button>
  <div class="scroller">
    <ul class="items">
      <li class="item" style="background-image:url(http://lorempixel.com/960/300/city);">City</li>
      <li class="item" style="background-image:url(http://lorempixel.com/960/300/animals);">Animals</li>
      <li class="item" style="background-image:url(http://lorempixel.com/960/300/sports);">Sports</li>
    </ul>
  </div>
  <button onclick="next()">&raquo;</button>
</div>

script.js

var items = document.querySelector('.items');
var itemCount = document.querySelectorAll('.item').length;
var pos = 0;
var transform = Modernizr.prefixed('transform');

function setTransform() {
  items.style[transform] = 'translate3d(' + (-pos * items.offsetWidth) + 'px,0,0)';
}

function prev() {
  if (pos === 0) {
    pos = Math.max(itemCount - 1, 0);
  } else {
    pos = Math.max(pos - 1, 0);
  }
  setTransform();
}

function next() {
  if (pos === itemCount-1) {
    pos = 0;
  } else {
    pos = Math.min(pos + 1, itemCount - 1);
  }
  setTransform();
}

window.addEventListener('resize', setTransform);

scripts

<script src="https://cdnjs.cloudflare.com/ajax/libs/modernizr/2.8.3/modernizr.min.js"></script>

style.css

body {
  background: #333;
  padding: 20px;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
.slider {
  -ms-flex-align: stretch;
  -webkit-box-align: stretch;
  align-items: stretch;
  box-sizing: border-box;
  display: flex;
  margin: 2em auto;
  padding: 0;
  width: 90%;
}
.slider button {
  -webkit-transition: opacity 300ms ease-out;
  background: transparent;
  border: none;
  box-sizing: border-box;
  color: #fff;
  font-size: 40px;
  margin: 0;
  opacity: 0.5;
  outline: none;
  padding: 0;
  text-align: center;
  transition: opacity 300ms ease-out;
  width: 30px;
}
.slider button:hover {
  opacity: 1;
}
.slider .scroller {
  -ms-flex: 1;
  -webkit-box-flex: 1;
  box-sizing: border-box;
  flex: 1;
  margin: 0;
  overflow: hidden;
  padding: 0;
}
.slider .scroller .items {
  -webkit-transition: -webkit-transform 1s ease-in-out;
  box-sizing: border-box;
  font-size: 0;
  line-height: 0;
  list-style-type: none;
  margin: 0;
  padding: 0;
  transition: -webkit-transform 1s ease-in-out;
  transition: transform 1s ease-in-out, -webkit-transform 1s ease-in-out;
  transition: transform 1s ease-in-out;
  white-space: nowrap;
}
.slider .scroller .items .item {
  background-position: 50% 50%;
  background-size: cover;
  box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
  box-sizing: border-box;
  color: #fff;
  display: inline-block;
  font-size: 25px;
  font-weight: bold;
  height: 250px;
  letter-spacing: -0.03em;
  line-height: 1;
  margin: 0;
  padding: 0;
  padding: 30px 20px;
  text-transform: uppercase;
  width: 100%;
}