onrender

Returns a Promise when an element finishes laying out by using a forced reflow and then runs the callback function. For situations when setTimeout(0) or requestAnimationFrame doesn't quite cut it.

Useful for running code that requires the element to be laid out or chaining style changes such as toggling the style from display: none to display: block followed by a transition which the browser would otherwise batch together resulting in no animations being fired.

Use cases include overlays of all sorts you don't wish to keep in the memory such as modals, fullscreen navigations and other layout-intensive stuff.

Installation

Use it as a node module:

npm install --save onrender

or just include it as a standalone script:

<script src="onrender.js"></script>

Usage

function needsLayout () {
  /* stuff that needs the element to be laid out */
}

const elementToWatch = document.querySelector('.element')

onRender(elementToWatch, needsLayout)