Layout Observer

Layout Observer watches for a smattering of events and mutations and notifies you when it has detected something that may have affected the layout of a web page (something may have moved or changed size).

Installation

npm install --save layout-observer

Usage

import LayoutObserver from 'layout-observer';

const observer = new LayoutObserver(() => console.log('layout change'));
observer.observe();

API

Constructor

LayoutObserver(handler, options)

handler The function that should be called each time a change has been detected.

options Options object which allows for the following properties:

options.throttle If set to a number greater than 0, LayoutObserver will ensure that handler is invoked no more frequently than once every throttle milliseconds.

Instance Methods

observe()

Begins observation.

disconnect()

Ends observation.

Supported Browsers

Modern browsers. The latest Chrome, Firefox, Safari, and Edge, as well as IE 11+.

Inspiration

iframe-resizer was a fantastic resource for much of the event and mutation detection logic.

License

MIT