react-use-scrollspy is a React Hook which requires React 16.8.0 or later.
// yarn yarn add react-use-scrollspy // or npm npm i react-use-scrollspy --Simport useScrollSpy from 'react-use-scrollspy'; ... const activeSection = useScrollSpy({ sectionElementRefs: [], // Array of References to DOM elements });| Parameter | Default | Type | Description |
|---|---|---|---|
| defaultValue | 0 | int | Default value that is returned (optional) |
| offsetPx | 0 | int | Set offset (optional) |
| sectionElementRefs | [] | [Ref] | Array of Refs to observe (e.g. via React refs) |
Use React refs for section elements like in the provided example.
import React, { useRef } from 'react'; import useScrollSpy from 'react-use-scrollspy'; const App = () => { const sectionRefs = [ useRef(null), useRef(null), useRef(null), ]; const activeSection = useScrollSpy({ sectionElementRefs: sectionRefs, offsetPx: -80, }); return ( <nav className="App-navigation"> <span className={activeSection === 0 ? "App-navigation-item App-navigation-item--active" : "App-navigation-item"}>Section 1</span> <span className={activeSection === 1 ? "App-navigation-item App-navigation-item--active" : "App-navigation-item"}>Section 2</span> <span className={activeSection === 2 ? "App-navigation-item App-navigation-item--active" : "App-navigation-item"}>Section 3</span> </nav> <section className="App-section" ref={sectionRefs[0]}> <h1>Section 1</h1> </section> <section className="App-section" ref={sectionRefs[1]}> <h1>Section 2</h1> </section> <section className="App-section" ref={sectionRefs[2]}> <h1>Section 3</h1> </section> )