jQuery Plugin For Before/After Image Comparison On Scroll - sequency

sequency.js is a jQuery plugin which enables you to compare the differences between a set of images in sequence as your scroll down and up.

How to use it:

1. Create a container for the before/after image comparison interface.

<div id="sequency-container" >
  
</div>

2. Import jQuery library and the jQuery sequency.js into the webpage.

<script src="//code.jquery.com/jquery-1.11.3.min.js"></script>
<script src="js/jquery.sequency.js"></script> 

3. Add the images you want to compare into a JSON object.

var $jsonSource =  [
    {caption:"Skeleton", img:"img/1.png"},
    {caption:"Projection", img:"img/2.png"},
    {caption:"Muscle groups", img:"img/3.png"},
    {caption:"Muscles", img:"img/4.png"}
];

4. Initialize the plugin on the container you just created.

$("#sequency-container").sequency({
  jsonSource: $jsonSource
});

5. The required CSS styles. Add the following CSS snippets into your CSS file.

.seq-wrapper {
  margin: 0 auto;
  width: 980px;
  padding: 40px 0 10px;
  position: relative;
}

.seq-wrapper:after, .seq-wrapper:before {
  display: table;
  clear: both;
  zoom: 1;
  content: "";
}

.seq-section { background: #FFF; }

h1.section-title {
  text-align: center;
  font-size: 50px;
  padding-bottom: 40px;
  line-height: 40px;
  font-family: 'Raleway', sans-serif;
  font-weight: 400;
  color: #000;
  text-align: center;
  text-transform: capitalize;
}

#sequency-flyer { position: absolute; }

#sequency-flyer.anch {
  position: fixed;
  top: 50%!important;
  -webkit-transform: translateZ(0);
}

#sequency-flyer {
  width: 980px;
  height: 487px;
  margin-top: -243px;
  top: 350px;
}

#sequency {
  height: 296px;
  width: 465px;
  margin: 0 auto;
  margin-bottom: 95px;
  overflow: hidden;
  position: relative;
}

#sequency img {
  position: relative;
  height: auto;
  display: inline-block;
  margin: 0 auto;
}

#sequency .ja, #sequency .jb {
  width: 465px;
  overflow: hidden;
  position: absolute;
  left: 0px;
  height: 100%;
}

#sequency .ja, #sequency .jb {
  -webkit-transition: height .1s ease-out;
  -moz-transition: height .1s ease-out;
  -ms-transition: height .1s ease-out;
  -o-transition: height .1s ease-out;
  transition: height .1s ease-out;
  text-align: center;
}

#sequency .ja.no-trans, #sequency .jb.no-trans {
  -webkit-transition: none;
  -moz-transition: none;
  -ms-transition: none;
  -o-transition: none;
  transition: none;
}

#sequency_bar {
  -webkit-transition: top .1s ease-out;
  -moz-transition: top .1s ease-out;
  -ms-transition: top .1s ease-out;
  -o-transition: top .1s ease-out;
  transition: top .1s ease-out;
}

#sequency_bar {
  width: 100%;
  margin-left: 0;
}

#sequency_bar.down {
  box-shadow: 0 5px 5px 5px rgba(33,33,33,.05);
  -moz-box-shadow: 0 5px 5px 5px rgba(33,33,33,.05);
  -webkit-box-shadow: 0 5px 5px 5px rgba(33,33,33,.05);
}

#sequency_bar.up {
  box-shadow: 0 -5px 5px 5px rgba(33,33,33,.05);
  -moz-box-shadow: 0 -5px 5px 5px rgba(33,33,33,.05);
  -webkit-box-shadow: 0 -5px 5px 5px rgba(33,33,33,.05);
}

#sequency .ja {
  bottom: 0;
  z-index: 15;
}

#sequency .jb {
  top: 0px;
  z-index: 20;
  background: #FFF;
}

#sequency .jb img { visibility: hidden; }

#sequency .jb.active img { visibility: visible; }

#sequency_bar {
  height: 1px;
  background: #c5c5c5;
  position: absolute;
  top: 295px;
  z-index: 1000;
}

#sequency_bar.full {
  width: 2400px;
  margin-left: -900px;
}

#sequency_text {
  width: 510px;
  margin: 0 auto;
  margin-bottom: 180px;
}

#sequency_text ul {
  text-align: center;
  display: block;
  margin: 0 auto;
  padding: 0;
}

#sequency_text ul li {
  float: none;
  display: inline-block;
  margin-left: 10px;
  margin-right: 10px;
}

#sequency_text ul li span {
  -webkit-transition: opacity .5s ease-in-out;
  -moz-transition: opacity .5s ease-in-out;
  -ms-transition: opacity .5s ease-in-out;
  -o-transition: opacity .5s ease-in-out;
  transition: opacity .5s ease-in-out;
}

#sequency_text ul li span, #sequency_text ul li a {
  float: none;
  font-family: "Raleway";
  font-size: 16px;
  color: #636363;
  opacity: 0;
}

#sequency_text ul li.active span, #sequency_text ul li.active a { opacity: 1; }

#sequency_nav { position: absolute; }

#sequency_nav ul { }

#sequency_nav ul li {
  display: block;
  margin-bottom: 10px;
}

#sequency_nav ul li a {
  background: #e3e3e3;
  cursor: pointer;
  text-indent: -9999px;
  width: 10px;
  height: 10px;
  display: block;
  cursor: pointer;
  text-indent: 9999px;
  overflow: hidden;
  border-radius: 5px;
  box-sizing: content-box;
  text-align: right;
}

#sequency_nav ul li.active a { background: #b0b0b0; }

6. Customization options with default values.

// data source
jsonSource:    [],

// plugin title
title      :  "jQuery.sequency.js", 

// step speed in ms
stepSpeed    :  1500,

// viewport height
viewportHeight   :  264,

// viewort padding
viewportPaddingY :  50,

// fullscreen mode
barFullscreen  :  false,

// parent container
container    : window,

// callback
initiate:    function(){},

---

This awesome jQuery plugin is developed by CarmineRumma. For more Advanced Usages, please check the demo page or visit the official website.