2 React Scroll Indicators

by Vladimir 1 min read

This collection is a complete guide to creating scroll progress indicators in React. Both the fundamental approach with useState/useEffect hooks for manual calculations and the modern implementation with framer-motion for smooth, declarative animation are covered. To create unique UIs, the technique of circular SVG indicators is demonstrated, where stroke-dashoffset is animated in response to scroll. This is your toolkit for adding informative and stylish feedback to any project.

Examples

Alphabetical contact list sidebar indicator with active letters dynamically scaling using CSS scroll-driven animations and view-timeline.

Scroll-Driven CSS Alphabet Indicator Sidebar

The “Scroll-Driven CSS Alphabet Indicator Sidebar” connects a scrollable contact list to a sidebar index using CSS Scroll-Driven Animations. It defines a timeline-scope on the parent and a view-timeline on each alphabetical section. Floating sidebar letters scale dynamically as sections cross the viewport, creating smooth, scroll-linked feedback without high-overhead JS scroll listeners. (Requires: react.js, react-dom.js, faker.js)

Technologies:
HTML CSS JavaScript/Babel
Difficulty:Advanced
Browser Support (as of Jul 2026):
Chrome Chrome 115+ Edge Edge 115+ Safari Safari 26+
Features:
Scroll AnimationsView TimelineSticky Headers
Code by: Jhey Jhey
License: MIT
Interactive horizontal photo gallery of cats and dogs with parallax scrolling effects.

FizzBuzz Photo Gallery

An interactive horizontal timeline featuring drag-to-scroll navigation with synchronized multi-layer parallax effects for images, background, and labels, built with React and TypeScript.

See the Pen FizzBuzz Photo Gallery.