RSK World - Infinite Scroll Demo | Lazy Loading, Themes, Search & Analytics | RSK World

Lazy Loading & Observer Themes & Animations Search & Filter Analytics & PWA Vanilla JS

Infinite Scroll Demo is an advanced infinite scroll implementation with lazy loading, smooth transitions, and performance optimization. Features: Intersection Observer API for scroll detection; DataGenerator for realistic demo content (categories, tags, authors); ThemeManager (light, dark, high-contrast, ocean, forest, sunset); search and filter bar; Analytics (page views, interactions, LCP/FID/CLS); accessibility (skip link, keyboard shortcuts, live regions); service worker for caching and offline. CSS: styles.css with CSS variables and theme support. JS: main.js, config.js, modules (InfiniteScroll.js, DataGenerator.js, ThemeManager.js, Analytics.js). By rskworld.in.

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Infinite Scroll & Lazy Loading

InfiniteScroll.js: Intersection Observer with configurable rootMargin and threshold; loadMoreContent(), fetchContent(page), createContentElement(); skeleton loader, retry on error, end-of-content message. main.js: CustomInfiniteScroll with DataGenerator and createContentCard(). Visibility API pauses loading when tab is hidden.

InfiniteScroll.js: IntersectionObserver, loadInitialContent(), loadMoreContent()
main.js: fetchContent(page), createContentCard(item, index)
Skeleton cards, retry attempts, requestAnimationFrame scroll throttle
Responsive itemsPerPage and rootMargin (mobile/tablet/desktop)

Project Structure & Files

Root: index.html (header, search/filter, stats bar, content grid, footer). assets/css: styles.css (theming, cards, skeleton, animations). assets/js: main.js, config.js; modules: InfiniteScroll.js, DataGenerator.js, ThemeManager.js, Analytics.js. sw.js (service worker), manifest.json (PWA). No build step. Open index.html or serve folder.

index.html, manifest.json, sw.js
No build step – open index.html or static server
CSS variables for themes; Inter (optional), system fonts
Zero dependencies; vanilla HTML, CSS, JavaScript

Themes & ThemeManager

ThemeManager.js: 6 themes (light, dark, high-contrast, ocean, forest, sunset) via CSS custom properties on documentElement; localStorage persistence; follow system preference (prefers-color-scheme); smooth transitions. styles.css: :root and [data-theme] variables for --primary-color, --background-primary, --text-primary, etc.

ThemeManager: applyTheme(), nextTheme(), getSystemTheme()
styles.css: --primary-color, --background-primary, --gradient-primary
data-theme attribute and CSS variables
Theme toggle in header; keyboard shortcut (T)

Search, Filter & Analytics

main.js: setupSearchAndFilter(), handleSearch(), handleFilter(), applyFilters(); debounced search, filter by category/featured/trending; stats bar (visible items, total items, pages loaded). Analytics.js: trackPageView(), trackEvent(), trackInteraction(), trackSearch(), trackFilter(), trackThemeChange(); LCP, FID, CLS; batch flush to /api/analytics.

Search: debounce 300ms, filter cards by text
Filters: Featured, Trending, Technology, Design, Development
Analytics: performance observers, session/user ID, event batching
Keyboard: Ctrl+K search, Ctrl+/ shortcuts modal

Pages & Navigation

index.html: header with title and theme toggle; search-filter-section; stats-section; main content grid (#contentGrid); loading spinner; footer with links (RSK World, Contact, About, Keyboard Shortcuts). Single-page app; content loaded dynamically. Service worker registered for offline and caching.

index.html – single page with header, search, stats, grid, footer
Content cards: category, title, description, meta, tags, like/bookmark/share
Skip to main content; ARIA and live region for announcements
PWA: manifest.json, sw.js cache strategies

What You Get

Static HTML/CSS/JS: index.html, assets/css/styles.css, assets/js/main.js, config.js, modules (InfiniteScroll, DataGenerator, ThemeManager, Analytics), sw.js, manifest.json. README.md with features, how it works, customization. No build step. Open index.html or serve folder.

Complete source – all HTML, CSS and JS files
No build step – open index.html or static server
README.md with Intersection Observer and performance notes
Technologies: HTML5, CSS3, Vanilla JS. © 2026 RSK World.

Usage

Open index.html to run the infinite scroll demo. Scroll to load more content; use search and filter; switch themes with the header button or T key. Customize via config.js and styles.css. See README.md for Intersection Observer options and customization.

index.html – main page with infinite scroll and all features
config.js: infiniteScroll, dataGenerator, themeManager, analytics
Accessibility: skip link, focus styles, reduced motion
Author: RSK World | rskworld.in

Project Features

Infinite scroll with Intersection Observer, lazy loading, skeleton loader, retry logic; 6 themes with ThemeManager; search and filter; analytics (events, performance, errors); DataGenerator for demo content; keyboard shortcuts; service worker for caching and offline; responsive grid; card interactions (like, bookmark, share). All vanilla JS.

Core: InfiniteScroll, DataGenerator, ThemeManager, Analytics
Advanced: search, filter, themes, PWA, a11y
Card actions, toast notifications, keyboard shortcuts
Vanilla JS, responsive, mobile-first

Credits & Acknowledgments

Infinite Scroll Demo by RSK World. Advanced infinite scroll with lazy loading, themes, search & filter, and analytics for learning modern web techniques and Intersection Observer API.