Parallaxis
A tiny parallax library that updates styles on scroll
- Plain old vanilla JS
- Just x.xkb gzipped
Warning
Parallax works by listening to every scroll event.
Parallaxis is probably the only parallax library that thinks
parallax is a shit show.
This leads to Parallaxis being quite opinionated. It allows
only a few element styles to be updated on scroll, in the
hope of not totally killing performance.
opacity
translateX
translateY
For best performance try to only use Parallaxis on one or
two elements per page, and avoid using on mobile completely.
Examples
Codepen
Alternatively, take a look in /examples
.
Installation
npm install parallaxis
Usage
<section
id="hello-world"
class="js-parallaxis"
data-start="0"
data-end="200"
data-opacity-start="1"
data-opacity-end="0"
>
<h1>Hello world</h1>
</section>
import parallaxis from 'parallaxis'
parallaxis()
The above example translates to:
- When
window.scrollY
equals 0
then the opacity
of #hello-world
will be 1
. - When
window.scrollY
equals 200
, or more, then the
opacity
of #hello-world
will be 0
. - When
window.scrollY
is somewhere between 0
and
200
then the opacity
of #hello-world
will be
somewhere between 0
and 1
.
Options
The parallaxis
function can take an object, that
may include the following properties.
className
The class name that Parallaxis uses to locate elements.
Defaults to js-parallaxis
.
parallaxis({ className: 'my-special-class' })
Data attributes
Parallaxis uses element data attributes for configuration.
Required
start
This is the window.scrollY
position that will be the
element's update start point.
<section
class="js-parallaxis"
data-start="0"
>
</section>
end
This is the window.scrollY
position that will be the
element's update end point.
<section
class="js-parallaxis"
data-start="0"
data-end="200"
>
</section>
Optional
opacity
Defining data-opacity-start
and data-opacity-end
will
result in opacity
style updates.
start
<section
class="js-parallaxis"
data-start="0"
data-end="200"
data-opacity-start="1"
data-opacity-end="0"
>
</section>
translateX
Defining data-translatex-start
and data-translatex-end
will result in transform: translateX()
style updates.
<section
class="js-parallaxis"
data-start="0"
data-end="200"
data-translatex-start="0"
data-translatex-end="200"
>
</section>
translateY
Defining data-translatey-start
and data-translatey-end
will result in transform: translateY()
style updates.
<section
class="js-parallaxis"
data-start="0"
data-end="200"
data-translatey-start="0"
data-translatey-end="200"
>
</section>
Browser support
Parallaxis is packaged with Babel, and
makes use of Array.from
.
If you want Parallaxis to work on browsers that don't support
this method (e.g. IE11), then you will need to
polyfill Array.from
before calling parallaxis
.