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Create an one-time event handler

Written byPhuoc Nguyen
24 Mar, 2021
DOM, JavaScript
Sometimes we want a given event of an element to happen once. Usually, it can be done by attaching a handler which removes itself:
const handler = (e) => {
// Do something ...
element.removeEventListener('click', handler);

element.addEventListener('click', handler);
We can use a named function expression to shorten the code a little bit:
element.addEventListener('click', function handler(e) {
// Do something ...

// Remove the handler
e.currentTarget.removeEventListener(e.type, handler);
However, the modern browsers provide the new `once` option that makes things easier. We don't have to track the reference of the handler anymore.
(e) => {
// Do something ...
once: true,
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Phước Nguyễn