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thebuilder avatar

thebuilder/react-intersection-observer

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React Intersection Observer

react-intersection-observer is a React implementation of the Intersection Observer API designed to track when DOM elements enter or leave the browser viewport. It provides a wrapper and a set of hooks for monitoring element visibility and triggering callbacks when content becomes visible to the user.

The library includes a mechanism for DOM occlusion detection to determine if an element is covered by other components or hidden by CSS filters. It also features a polyfill wrapper that provides visibility fallbacks for browsers that do not natively support intersection observer capabilities.

The project covers various visibility tracking capabilities, including state-synced updates for component re-renders and non-rendering monitoring to execute callbacks without updating state. These tools support the implementation of infinite scrolling, lazy loading of assets, and scroll-based animations.

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react-intersection-observer.vercel.app
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Features

  • Viewport Observers - Tracks when DOM elements enter or exit the browser viewport to trigger application actions.
  • Item Visibility Detection - Determines if a specific UI element is currently visible in the viewport.
  • Viewport Visibility Observers - Provides a set of hooks for monitoring element visibility and triggering callbacks.
  • Browser API Wrappers - Implements a functional wrapper around the native browser Intersection Observer API.
  • Intersection Observer Implementations - Provides a React implementation of the Intersection Observer API for viewport visibility tracking.
  • Visibility State Syncing - Synchronizes the native observer callback with React state to trigger component re-renders.
  • Event-Driven Callbacks - Executes user-defined functions directly from the observer to avoid unnecessary React state updates.
  • DOM Occlusion Detection - Detects if an element is covered by other components or hidden by CSS filters.
  • Occlusion Tracking - Tracks whether a DOM element is covered by another element or hidden by filters.
  • Infinite Scrolling - Enables the implementation of infinite scrolling by detecting when the user reaches the bottom of a list.
  • Ref-Based Measurement - Binds observers to DOM elements using React refs to track visibility and trigger logic.
  • Scroll Animations - Triggers visual transitions and animations when elements become visible on the screen.
  • Non-Rendering Visibility Monitoring - Executes callbacks upon visibility changes without triggering component state updates for optimized performance.
  • Image Lazy Loading - Defers the loading of images and media assets until they enter the browser viewport.
  • Browser & DOM Utilities - Intersection Observer API implementation.
  • Visibility Reporters - React implementation of the Intersection Observer API.
5,537 stars·189 forks·TypeScript·MIT·20 views

Star history

Star history chart for thebuilder/react-intersection-observerStar history chart for thebuilder/react-intersection-observer

How this analysis was created: This summary and feature list are AI-generated from collected project material and can contain mistakes. Stars, license and language are imported from GitHub. Inclusion does not mean that we have tested or audited this project. Check the source documentation for any feature you depend on. Learn more on our About page.

Frequently asked questions

What does thebuilder/react-intersection-observer do?

react-intersection-observer is a React implementation of the Intersection Observer API designed to track when DOM elements enter or leave the browser viewport. It provides a wrapper and a set of hooks for monitoring element visibility and triggering callbacks when content becomes visible to the user.

What are the main features of thebuilder/react-intersection-observer?

The main features of thebuilder/react-intersection-observer are: Viewport Observers, Item Visibility Detection, Viewport Visibility Observers, Browser API Wrappers, Intersection Observer Implementations, Visibility State Syncing, Event-Driven Callbacks, DOM Occlusion Detection.

Which projects share features with thebuilder/react-intersection-observer?

Projects with overlapping indexed features include: hilongjw/vue-lazyload — vue-lazyload is a Vue.js image lazy loading plugin and frontend asset optimizer. It serves as a viewport visibility… camwiegert/in-view — in-view is a DOM visibility detector and intersection observer wrapper. It serves as a viewport transition handler… brigade/react-waypoint — react-waypoint is a set of React components and wrappers designed to execute callbacks when specific DOM elements… twobin/react-lazyload — react-lazyload is a React component and viewport visibility wrapper designed to minimize resource consumption by… apoorvsaxena/lozad.js — lozad.js is a JavaScript lazy loading library and viewport-based media loader. It serves as a dependency-free wrapper… michalsnik/aos — AOS is a scroll-triggered animation library that controls the execution, timing, and mapping of CSS transitions based…

Projects sharing features with React Intersection Observer

These projects share indexed features with React Intersection Observer. Shared tags can include platform or build tooling; verify the primary use case before treating a result as a replacement.
  • hilongjw/vue-lazyloadhilongjw avatar

    hilongjw/vue-lazyload

    8,006View on GitHub↗

    vue-lazyload is a Vue.js image lazy loading plugin and frontend asset optimizer. It serves as a viewport visibility observer that defers the loading of images and components until they enter the browser viewport to reduce initial page load times. The project functions as a progressive image loader by managing image placeholders and implementing dynamic source switching. It uses a browser API to monitor when elements enter the viewport, avoiding expensive scroll event listeners to maintain performance. The plugin provides capabilities for image loading state tracking, including custom placeho

    JavaScriptlazyloadvuevue-lazyload
    View on GitHub↗8,006
  • camwiegert/in-viewcamwiegert avatar

    camwiegert/in-view

    4,611View on GitHub↗

    in-view is a DOM visibility detector and intersection observer wrapper. It serves as a viewport transition handler that triggers callbacks and events when specific screen elements enter or exit the browser window. The library provides a system for configuring visibility criteria using pixel offsets, percentages, or custom test functions. It includes utilities for observing visibility changes, performing manual visibility evaluations, and checking the current status of an element within the visible area. These capabilities support application patterns such as lazy loading, infinite scrolling,

    JavaScriptjavascriptutilityviewport
    View on GitHub↗4,611
  • brigade/react-waypointbrigade avatar

    brigade/react-waypoint

    4,047View on GitHub↗

    react-waypoint is a set of React components and wrappers designed to execute callbacks when specific DOM elements enter or exit the visible screen area. It functions as a viewport visibility tracker that monitors when elements cross predefined spatial boundaries. The project provides a scroll trigger component and event wrapper that allow for custom offset configurations to account for fixed UI elements. These tools can be configured to use a specific DOM node or the global window as the scrollable ancestor for visibility calculations. The library covers several implementation patterns, incl

    JavaScript
    View on GitHub↗4,047
  • twobin/react-lazyloadtwobin avatar

    twobin/react-lazyload

    5,904View on GitHub↗

    react-lazyload is a React component and viewport visibility wrapper designed to minimize resource consumption by deferring the display of off-screen UI elements. It functions as a frontend performance optimizer that delays the rendering of images or components until they enter the browser viewport. The library prevents layout shifts by allowing the definition of placeholder dimensions, maintaining page stability while content loads lazily. It manages the transition from these placeholders to actual content using internal state and optional animations. The system provides mechanisms for viewp

    JavaScriptlazyloadreact
    View on GitHub↗5,904
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