2016-02-15-detect-document-ready-in-pure-js.md

layout	post
title	Detect document ready in pure JS
tip-number	46
tip-username	loverajoel
tip-username-profile	https://www.twitter.com/loverajoel
tip-tldr	The cross-browser way to check if the document has loaded in pure JavaScript
tip-writer-support	https://www.coinbase.com/loverajoel
redirect_from	/en/detect-document-ready-in-pure-js/
categories	en javascript

The cross-browser way to check if the document has loaded in pure JavaScript is using readyState.

if (document.readyState === 'complete') {
  // The page is fully loaded
}

You can detect when the document is ready...

let stateCheck = setInterval(() => {
  if (document.readyState === 'complete') {
    clearInterval(stateCheck);
    // document ready
  }
}, 100);

or with onreadystatechange...

document.onreadystatechange = () => {
  if (document.readyState === 'complete') {
    // document ready
  }
};

Use document.readyState === 'interactive' to detect when the DOM is ready.