in-view-js

Module for capturing element in viewport on native Javascript.

Demo: CodePen

Usage:

let element   = document.getElementById('test'),
    callback  = (isInView) => console.log('is Element visible?', isInView),
    overlapEl = document.getElementById('fixed-top-bar');

let inViewInstance = new InViewPort({
    element,
    callback,
    overlapEl
});

inViewInstance.addListeners();

/* ... */

inViewInstance.removeListeners();

Feature: Added "overlapEl" for counting overlapping elements (fixed top bars).

Tested with ES6 modules.