Rellax is a buttery smooth, super lightweight (1021bytes gzipped), vanilla javascript parallax library. Update: Rellax now works on mobile (v1.0.0).

• Demo Website

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npm install rellax --save or if you're old school like us download and insert rellax.min.js

<div class="rellax">
  I’m that default chill speed of "-2"
</div>
<div class="rellax" data-rellax-speed="7">
  I’m super fast!!
</div>
<div class="rellax" data-rellax-speed="-4">
  I’m extra slow and smooth
</div>

<script src="rellax.min.js"></script>
<script>
  // Accepts any class name
  var rellax = new Rellax('.rellax');
</script>

<script>
  // Also can pass in optional settings block
  var rellax = new Rellax('.rellax', {
    speed: -2,
    center: false,
    round: true,
    vertical: true,
    horizontal: false
  });
</script>

Use the data-rellax-speed attribute to set the speed of a .rellax element to something other than the default value (which is -2). A negative value will make it move slower than regular scrolling, and a positive value will make it move faster. We recommend keeping the speed between -10 and 10.

After some fantastic work from @p-realinho, we just released the ability to center parallax elements in your viewport! We'll be building a nice demo website, but for now check out the tests folder for several examples of how it works.

There's two ways to implement centering, either on specific elements or as a global option.

<div class="rellax" data-rellax-percentage="0.5">
  I’m that default chill speed of "-2" and "centered"
</div>
<div class="rellax" data-rellax-speed="7" data-rellax-percentage="0.5">
  I’m super fast!! And super centered!!
</div>
<div class="rellax" data-rellax-speed="-4" data-rellax-percentage="0.5">
  I’m extra slow and smooth, and hella centered.
</div>

<script>
  // Center all the things!
  var rellax = new Rellax('.rellax', {
    center: true
  });
</script>

If you want to sort your elements properly in the Z space, you can use the data-rellax-zindex property

<div class="rellax">
  I’m that default chill speed of "-2" and default z-index of 0
</div>
<div class="rellax" data-rellax-speed="7" data-rellax-zindex="5">
  I’m super fast!! And on top of the previous element, I'm z-index 5!!
</div>

Horizontal parallax is disabled by default. You can enable it by passing horizontal: true in the settings block. This feature is intended for panoramic style websites, where users scroll horizontally instead of vertically. Note that this can work together at the same time with the default vertical parallax. If you do not want this, pass vertical: false in the settings block.

<script>
  // Start Rellax
  var rellax = new Rellax('.rellax');
  
  // End Rellax and reset parallax elements to their original positions
  rellax.destroy();
</script>

<script>
  // Start Rellax
  var rellax = new Rellax('.rellax-blur-card', {
    callback: function(positions) {
      // callback every position change
      console.log(positions);
    }
  });
</script>

Instead of using a className you can use a node, handy when using React and you want to use refs instead of className.

<div ref={ref => { this.rellaxRef = ref }}>
  I’m that default chill speed of "-2"
</div>

var rellax = new Rellax(this.rellaxRef)

If you're using Rellax in production, we'd love to list you here! Let us know: [email protected]

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Learn Rellax and other web animation skills with a course on CSS Animation Rocks

In the spirit of lightweight javascript, the build processes (thus far) is lightweight also.

1. Open demo.html
2. Make code changes and refresh browser
3. Once feature is finished or bug fixed, use jshint to lint code
4. Fix lint issues then use Google Closure Compiler to minify
5. 🍻