React Component that observe changes in the intersection of a target element with viewport using IntersectionObserver

$ npm install --save viewport-observer

This package depends on IntersectionObserver, so you probably need to polyfill via w3c/IntersectionObserver Polyfill before using this package.

// you probably need to polyfill
import 'intersection-observer';
import ViewportObserver from 'viewport-observer';

...

<ViewportObserver
  onChange={() => console.log('onChange')}
  onEnter={() => console.log('onEnter')}
  onLeave={() => console.log('onLeave')}>
  <div>{/* ... */}</div>
</ViewportObserver>

You can call dispose() of ViewportObserver instance to stop observing and dispose IntersectionObserver instance.

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