ScrollDir, short for Scroll Direction, is a 0 dependency, ~1kb micro Javascript plugin to easily leverage vertical scroll direction in CSS via a data attribute. ?
ScrollDir is perfect for:
- showing or hiding sticky elements based on scroll direction ?
- only changing its direction attribute when scrolled a significant amount ?
- ignoring small scroll movements that cause unwanted jitters ?
Usage
ScrollDir will set the data-scrolldir attribute on the <html> element to up or down:
<html data-scrolldir="up">
or
<html data-scrolldir="down">
Now it’s easy to change styles based on the direction the user is scrolling!
[data-scrolldir="down"] .my-fixed-header { display: none; }
In Action ?
Install ?
npm
npm install scrolldir --save
bower
bower install scrolldir --save
yarn
yarn add scrolldir
Setup ?
Easy Mode
Add dist/scrolldir.auto.min.js and you’re done. There is nothing more to do! Scrolldir will just work.
Now go write some styles using [data-scrolldir="down"] and [data-scrolldir="up"].
Custom Mode ?
Add dist/scrolldir.min.js. You have access to the API options below and must invoke scrollDir.
scrollDir();
To use an attribute besides data-scrolldir:
scrollDir({ attribute: 'new-attribute-name' });
To add the Scrolldir attribute to a different element:
scrollDir({ el: 'your-new-selector' });
To turn Scrolldir off:
scrollDir({ off: true });
To turn provide a different scroll direction on page load (or app start):
scrollDir({ dir: 'up' }); // the default is 'down'
To change the thresholdPixels—the number of pixels to scroll before re-evaluating the direction:
scrollDir({ thresholdPixels: someNumber }); // the default is 64 pixels
// example: scrollDir({ thresholdPixels: 10 })
Example ?
- scrolldir on codepen.
This is a modular version of pwfisher's scroll-intent. If you'd like to use scrolldir with jQuery—use Scroll Intent. Scrolldir should work easily within any front-end framework so it ditches library dependencies. ~TY!