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blur vs focusOut

Written byPhuoc Nguyen
25 Aug, 2023
In JavaScript DOM, when an element loses focus, two events are triggered: `blur` and `focusOut`. While they may seem alike, there are significant differences between them that are worth noting.

The blur event

The `blur` event happens when an element loses focus, like when the user clicks somewhere else or tabs away from it.
input.addEventListener('blur', () => {
// Executed when element loses focus ...
The `blur` event is only triggered on the element that lost focus. It doesn't bubble up the DOM tree, so it won't be triggered on any parent elements.

The focusOut event

The `focusOut` event is also triggered when an element loses focus. However, it behaves slightly differently than `blur`.
element.addEventListener('focusout', () => {
// Executed when element loses focus ...
When an `focusOut` event occurs on an element, it bubbles up the DOM tree. This means that if the element has parent elements, those elements will also trigger the `focusOut` event.

The execution orders

It's important to note other difference between the `focusOut` and `blur` events: the `focusOut` event is triggered before the focus shifts, while the `blur` event is dispatched after.
The same goes for the `focusIn` and `focus` events.
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Phước Nguyễn