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#113

Create an one-time event handler

Topics: 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.

element.addEventListener('click', (e) => {
// Do something ...
}, {
once: true
});
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