https://github.com/stefan-kanazir/intersection-observer
https://github.com/stefan-kanazir/intersection-observer
intersection-observer javascript
Last synced: about 2 months ago
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- Host: GitHub
- URL: https://github.com/stefan-kanazir/intersection-observer
- Owner: stefan-kanazir
- Created: 2024-11-10T21:11:12.000Z (over 1 year ago)
- Default Branch: master
- Last Pushed: 2024-11-30T16:29:27.000Z (over 1 year ago)
- Last Synced: 2025-09-21T00:26:17.696Z (7 months ago)
- Topics: intersection-observer, javascript
- Language: HTML
- Homepage:
- Size: 23.4 KB
- Stars: 2
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Intersection Observer API Examples
This repository contains practical examples demonstrating various use cases of the Intersection Observer API. Each example is self-contained and can be run directly in the browser without any build steps.
[MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API)
## 🎯 Purpose
The goal of this repository is to provide clear, practical examples of how to use the Intersection Observer API in real-world scenarios. Each example is designed to demonstrate different aspects of the API while solving common web development challenges.
## 📚 Examples
### 01-simple-visibility
- #### [Code](./01-simple-visibility)
- #### [Demo](https://stefan-kanazir.github.io/intersection-observer/01-simple-visibility)
A basic implementation showing how to detect when elements enter and exit the viewport. This example helps understand the fundamental concepts of the Intersection Observer API.
**Key concepts covered:**
- Basic Intersection Observer setup
- Handling intersection entries
### 02-lazy-loading-images
- #### [Code](./02-lazy-loading-images)
- #### [Demo](https://stefan-kanazir.github.io/intersection-observer/02-lazy-loading-images)
An implementation of lazy loading images using the Intersection Observer API. Images are loaded only when they're about to enter the viewport, improving initial page load performance.
**Key concepts covered:**
- Creating an efficient lazy loading system for images
- Handling image loading states
- Performance optimization techniques
### 03-infinite-scroll
- #### [Code](./03-infinite-scroll)
- #### [Demo](https://stefan-kanazir.github.io/intersection-observer/03-infinite-scroll)
This example demonstrates how to implement infinite scroll functionality using the Intersection Observer API. Content is dynamically loaded as the user scrolls down the page, providing a seamless user experience, making it great choice for e-commerce stores, social media apps, job portals, real estate platforms etc.
**Key concepts covered:**
- Dynamically load content when the user reaches the bottom of the page
- Responsive design: loading a different number of cards based on the screen size
- Performance optimization: Using the rootMargin property to preload content slightly before it's visible in the viewport.
### 04-scroll-animations
- #### [Code](./04-scroll-animations)
- #### [Demo](https://stefan-kanazir.github.io/intersection-observer/04-scroll-animations)
This example demonstrates how to use the Intersection Observer API to trigger scroll-based animations with a single-use mechanism.
**Key concepts covered:**
- Creating scroll-triggered animations
- Implementing a one-time animation trigger
- Adding subtle entrance animations
## 🚀 Getting Started
1. Clone the repository:
```bash
git clone https://github.com/yourusername/intersection-observer-examples.git
```
2. Navigate to any example directory:
```bash
cd intersection-observer-examples/01-simple-visibility
```
3. Open the `index.html` file in your browser