Scrolling
Detect
Setup
Script
Javascript
Up
Down
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Documentation
Webflow
Code
Setup: External Scripts
External Scripts in Webflow
Make sure to always put the External Scripts before the Javascript step of the resource.
In this video you learn where to put these in your Webflow project? Or how to include a paid GSAP Club plugin in your project?
HTML
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Step 1: Copy structure to Webflow
Copy structure to Webflow
In the video below we described how you can copy + paste the structure of this resource to your Webflow project.
Copy to Webflow
Webflow structure is not required for this resource.
Step 1: Add HTML
HTML
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<body data-scrolling-started="false" data-scrolling-direction="up"></body>HTML structure is not required for this resource.
Step 2: Add CSS
CSS
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Step 2: Add custom Javascript
Custom Javascript in Webflow
In this video, Ilja gives you some guidance about using JavaScript in Webflow:
Step 2: Add Javascript
Step 3: Add Javascript
Javascript
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function initDetectScrollingDirection() {
let lastScrollTop = 0;
const threshold = 10; // Minimal scroll distance to switch to up/down
const thresholdTop = 50; // Minimal scroll distance from top of window to start
window.addEventListener('scroll', () => {
const nowScrollTop = window.scrollY;
if (Math.abs(lastScrollTop - nowScrollTop) >= threshold) {
// Update Scroll Direction
const direction = nowScrollTop > lastScrollTop ? 'down' : 'up';
document.querySelectorAll('[data-scrolling-direction]').forEach(el =>
el.setAttribute('data-scrolling-direction', direction)
);
// Update Scroll Started
const started = nowScrollTop > thresholdTop;
document.querySelectorAll('[data-scrolling-started]').forEach(el =>
el.setAttribute('data-scrolling-started', started ? 'true' : 'false')
);
lastScrollTop = nowScrollTop;
}
});
}
// Initialize Detect Scrolling Direction
document.addEventListener('DOMContentLoaded', () => {
initDetectScrollingDirection();
});Step 3: Add custom CSS
Step 2: Add custom CSS
Custom CSS in Webflow
Curious about where to put custom CSS in Webflow? Ilja explains it in the below video:
CSS
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Implementation
Attributes
- Add
[data-scrolling-started="false"]to the<body>, used to check if user scrolled - Add
[data-scrolling-direction="up"]to the<body>, used to check if user scrolling up or down
Example structure
For both Webflow and Code
<body data-scrolling-started="false" data-scrolling-direction="up">
<nav></nav>
</body>Animating
Use CSS to animate objects based on the changing attributes
.nav {
transition: transform 1s ease, padding 1s ease;
transform: translateY(0%) rotate(0.001deg);
padding: 2em 1em;
}
/* Shrink nav when scrolling started */
[data-scrolling-started="true"] .nav {
padding: 1em 1em;
}
/* Move nav out of window when scrolling down */
[data-scrolling-started="true"][data-scrolling-direction="down"] .nav {
transform: translateY(-100%) rotate(0.001deg);
}
/* Change background to filled when scrolling started */
.nav__inner {
transition: background-color 1s ease;
background-color: transparent;
}
[data-scrolling-started="true"] .nav__inner {
background-color: #fff;
}Search
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Resource Details
Last updated
January 22, 2025
Type
Osmo Basics
Category
Utilities & Scripts
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