on-intersect

Call back when an element intersects with another.

Usage

var onIntersect = require('on-intersect')
var html = require('bel')

var el = html`<h1>Yay, we're a heading!</h1>`

onIntersect(el, function () {
  console.log('Woot, component is visible!')
})

document.body.appendChild(html`
  <main>
    <div style="height: 110vh"></div>
    ${el}
    <div style="height: 110vh"></div>
  </main>
`)

API

stopObserving = onViewport(element, [opts], [onEnter], [onExit])

Call onEnter when an element scrolls into view, and onExit when an element scrolls out of view. opts can be any value passed into the InterSectionObserver constructor.

stopObserving()

Stop the observer.

Installation

$ npm install on-intersect

Further Reading

• MDN/Intersection_Observer_API

Authors

• Finn Pauls
• Yoshua Wuyts

License

MIT