Infinite Scroll + Data Loading Demo

A modern infinite scroll implementation built with SvelteKit that demonstrates seamless data loading and user experience patterns.

🚀 Live Demo: https://infinite-scroll.cybernaut.app/

Features

• Infinite Scroll: Automatically loads more content as users scroll
• Intersection Observer: Efficient scroll detection using modern browser APIs
• Loading States: Visual feedback during data fetching
• Form Actions: Server-side data fetching with SvelteKit actions
• Responsive Design: Works seamlessly on desktop and mobile devices
• Dark Mode Support: Built-in theme switching
• TypeScript: Full type safety throughout the application

Tech Stack

• Framework: SvelteKit
• Styling: TailwindCSS with custom design system
• Language: TypeScript
• Package Manager: pnpm
• Deployment: Docker-ready
• Data Source: DummyJSON API

Project Structure

src/
├── lib/
│   ├── components/
│   │   ├── custom/bento/         # Bento box components
│   │   └── ui/skeleton/          # Loading skeleton components
│   ├── hooks/                    # Custom Svelte hooks
│   └── utils.ts                  # Utility functions
├── routes/
│   ├── +layout.svelte           # App layout
│   ├── +page.svelte             # Main page
│   └── +page.server.ts          # Server actions
└── types/
    └── post.ts                  # TypeScript interfaces

Key Components

BentoBox

The main infinite scroll container that:

• Manages the list of items
• Handles intersection observer setup
• Triggers data loading when sentinel comes into view
• Provides loading states and error handling

Bento

Individual item component featuring:

• Modern card-based design
• Skeleton loading states
• Dark mode support
• Responsive layout

Getting Started

Prerequisites

• Node.js 18+
• pnpm (recommended) or npm

Installation

1. Clone the repository

   git clone <repository-url>
   cd infinite-scroll-demo
   

2. Install dependencies

   pnpm install
   

3. Start the development server

   pnpm dev
   

4. Open http://localhost:5173 in your browser

Building for Production

pnpm build

Docker Deployment (Recommended)

The project includes a multi-stage Dockerfile for production deployment:

# Run the container
docker run -p 3000:3000 ghcr.io/garrettpfoy/infinite-scroll-demo:latest

How It Works

1. Initial Load: The app fetches the first batch of posts on mount
2. Scroll Detection: An Intersection Observer watches a sentinel element at the bottom
3. Data Fetching: When the sentinel becomes visible, a server action fetches more posts
4. State Management: New posts are appended to the existing list using Svelte's reactive state
5. Loading States: Skeleton components provide visual feedback during loading

Configuration

Key configuration options in +page.svelte:

let limit = $state(10);        // Initial posts to load
let increment = 3;             // Posts to load on each scroll
let offset = $state(0);        // Current offset for pagination

API Integration

The demo uses the DummyJSON API for sample data. The server action in +page.server.ts handles:

• Parameter validation
• API requests
• Error handling
• Data transformation

Performance Considerations

• Intersection Observer: More efficient than scroll event listeners
• Skeleton Loading: Prevents layout shift during loading
• Efficient State Updates: Uses Svelte's reactive patterns
• TypeScript: Compile-time error checking

License

This project is open source and available under the MIT License.

Acknowledgments

• Built with SvelteKit
• Styled with TailwindCSS
• Sample data from DummyJSON
• Components from ShadCN-Svelte