Minimal Image Comparison Slider with jQuery - compareJS

compareJS is a very small (~2kb unminified) jQuery plugin to create a smooth comparison slider to help you compare the difference of two overlapping images.

How to use it:

1. Add before / after images together with the comparison slider control to the web page.

<div id="imgContainer">
  <div id="leftImg">
    <img src="before.jpg" draggable = 'false'></div>
  <div id="rightImg">
    <img src="after.jpg">
  </div> 
  <div id="dragbar">
    <div id="dragCircle">
      <span id="lineDash">&#8211;<br />&#8211;<br /> &#8211;</span>
    </div>
  </div>
</div>

2. Add jQuery library and the jQuery compareJS script to the webpage.

<script src="jquery.min.js"></script>
<script src="compareJS.js"></script>

3. The required CSS styles.

#imgContainer {
  width: 860px;
  height: 470px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

#leftImg {
  height: 470px;
  width: 860px;
  position: absolute;
  overflow: hidden;
  left: 0px;
}

#rightImg {
  height: 470px;
  position: absolute;
  overflow: hidden;
  right: 0px;
  z-index: 10;
}

#dragbar {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 8px;
  cursor: col-resize;
  background-color: rgba(20,20,20,.6);
  left: 100%;
  z-index: 20;
}

#dragCircle {
  width: 14px;
  height: 70px;
  position: absolute;
  left: -3px;
  top: 45%;
  background-color: rgba(10,10,10,.9);
  z-index: 50;
  border-radius: 3px;
}

#lineDash {
  position: absolute;
  width: 8px;
  height: 8px;
  color: white;
  font-size: 18px;
  text-align: center;
  text-decoration: bold;
  z-index: 100;
  line-height: 5px;
  margin-top: 30px;
  left: 3px;
}

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