op-view-progress

Element's position on the screen / view. Progress is calculated in relation between node's top position, height and window's height. The value is:

• -1 and less for items under viewport
• -1 ... 0 ... 1 in the viewport, where 0 is for elements in the middle
• 1 and more for items above viewport

Install

npm install op-view-progress

yarn add op-view-progress

Usage

import opViewProgress from 'op-view-progress';

Create instance:

const progress = new opViewProgress(domNode);

Update / tick:

progress.tick();

Get value:

progress.value;