HTML5 Video Before-and-After Comparison Slider

html5-video-before-and-after-comparison-slider.markdown

HTML5 Video Before-and-After Comparison Slider

Requested in response to my earlier comparison sliders. Full article.

A Pen by Dudley Storey on CodePen.

License.

index.html

<div id="video-compare-container">
  <video loop autoplay poster="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/dirty.jpg">
    <source src=https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/floodplain-dirty.mp4>
    <source src=https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/floodplain-dirty.webm>
  </video>
 <div id="video-clipper">
    <video loop autoplay poster="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/clean.jpg">
      <source src=https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/floodplain-clean.mp4>
      <source src=https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/floodplain-clean.webm>
    </video>
  </div>
	</div>

script.js

function trackLocation(e) {
  var rect = videoContainer.getBoundingClientRect(),
      position = ((e.pageX - rect.left) / videoContainer.offsetWidth)*100;
  if (position <= 100) { 
    videoClipper.style.width = position+"%";
    clippedVideo.style.width = ((100/position)*100)+"%";
    clippedVideo.style.zIndex = 3;
	}
}
var videoContainer = document.getElementById("video-compare-container"),
videoClipper = document.getElementById("video-clipper"),
clippedVideo = videoClipper.getElementsByTagName("video")[0];
videoContainer.addEventListener( "mousemove", trackLocation, false); 
videoContainer.addEventListener("touchstart",trackLocation,false);
videoContainer.addEventListener("touchmove",trackLocation,false);

scripts

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>

style.css

body {
  background: #333;
  margin: 2rem;
}
#video-compare-container {
  display: inline-block;
  line-height: 0;
  position: relative;
  width: 100%;
  padding-top: 42.3%;
}
#video-compare-container > video {
  width: 100%;
  position: absolute;
  top: 0; height: 100%;
}
#video-clipper {
  width: 50%; position: absolute;
  top: 0; bottom: 0;
  overflow: hidden;
}
#video-clipper video {
  width: 200%;
  postion: absolute;
  height: 100%;
}