Some quick, asynchronous JavaScript snippets for handling events

async function wait(ms) {
	new Promise(resolve => {
		setTimeout(resolve, ms);

// Use as a Promise
wait(500).then(/* Code to execute after half a second */);

await wait(1200);
// Run some code
await wait(5000);
// Run some more code

Here we have a simple wait function. It’s nothing incredible, but I think the syntax makes a little more sense than other methods. You can also make use of the await keyword in asynchronous code to delay or even stagger code.

async function waitUntil(target, event, opts = {once: true}) {
	await new Promise(resolve => {
		target.addEventListener(event, () => resolve(), opts);

await waitUntil(someButton, 'click');
// Code to execute after button is clicked.

This is pretty similar to typical event handling, except there is a pause in execution until the event occurs. I think that, in some situations, this could lead to a better logical flow in code. Think of pretty much any long process that has several pages and next buttons. This method avoids setting event listeners in callback functions, making code much easier.

async function ready() {
	if (document.readyState === 'loading') {
		await waitUntil(document, 'DOMContentLoaded');

async function loaded() {
	if (document.readyState !== 'complete') {
		await waitUntil(window, 'load');
await ready();
// Do all the things because the document is now ready
ready().then(/* Stuff to do after document is ready */);

As you might know, load and DOMContentLoaded events only fire once, so setting listeners for these events after the load event has occured prevents the callback from ever being dispatched. I also think that ready().then(stuff); or await loaded() is more meaningful and descriptive than $.ready(stuff);.

That’s all. I hope that some of these come in handy and that you remember waitUntil next time you’re writing some long, multi-step process in JavaScript.