pronkman / rellax

Lightweight, vanilla javascript parallax library

RELLAX

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

• Demo Website

Have any suggestions or feedback? Reach out @dixonandmoe

Getting Started

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,
  });
</script>

Features

Centering

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>

z-index

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>

Destroy

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

Callback

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

In the Wild

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

• Microsoft Fluent
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• The Rixey

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

Development

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. 🍻