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Event Listeners


Create and emit custom events.

The CustomEvent() method accepts two arguments: an event name, and and object of options. In the options, you can specify if the event should bubble and be cancelable (both false by default). You can also pass along additional information that an event listener can use with the detail property.

After setting up your event, call the dispatchEvent() method on your element and pass in the event as an argument.

// Create a new event
let event = new CustomEvent('myCustomEvent', {
	bubbles: true,
	cancelable: true,
	detail: {
		someDetail: 'the detail value'

// Dispatch the event
let elem = document.querySelector('#the-element-to-emit-on');