terwanerik/ScrollTrigger

Health v2 · maintenance only

Adoption not part of the score

3965 stars · 300 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

A lightweight JavaScript library that lets web pages react to scroll changes by toggling CSS classes and running callbacks when elements enter or leave the viewport. It supports per-element offsets, one-time triggers, and Promise-based callbacks useful for lazy loading.

Use cases

• fade in elements when they scroll into view
• lazy load images when they enter the viewport
• trigger animations based on scroll position
• implement infinite scroll
• toggle classes when elements leave the viewport
• run callbacks when a section becomes visible

When to choose

• you need simple scroll-based class toggling or callbacks in vanilla JavaScript
• you want a lightweight alternative to full animation suites like GSAP ScrollTrigger
• you need lazy loading or infinite scroll driven by viewport visibility

When to avoid

• you need complex scroll-scrubbed timeline animations (GSAP ScrollTrigger is more capable)
• your project is not browser-based JavaScript
• you need a library with frequent updates and active development

Facets

library · maturity maintenance

animation frontend-framework ui-components web-development frontend browser scroll-trigger scroll-animations lazy-loading viewport-detection vanilla-javascript scroll-events javascript nodejs

Member repositories

For agents

markdown · JSON · MCP: product_card(name="terwanerik/ScrollTrigger")