Create an one-time event handler
Written byPhuoc Nguyen
Created
24 Mar, 2021
Category
Tip
Tags
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:
js
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:
js
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.js
element.addEventListener(
'click',
(e) => {
// Do something ...
},
{
once: true,
}
);
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Phước Nguyễn