The focusin event fires when an element has received focus, after the focus event. The two events differ in that focusin bubbles, while focus does not.

The opposite of focusin is the focusout event, which fires when the element has lost focus.

The focusin event is not cancelable.

Use the event name in methods like addEventListener().

addEventListener("focusin", (event) => {});

A FocusEvent. Inherits from Event.

This interface also inherits properties from its parent UIEvent, and indirectly from Event.

FocusEvent.relatedTarget

The element losing focus, if any.

HTML

<form id="form">
  <label>
    Some text:
    <input type="text" placeholder="text input" />
  </label>
  <label>
    Password:
    <input type="password" placeholder="password" />
  </label>
</form>

JavaScript

const form = document.getElementById("form");

form.addEventListener("focusin", (event) => {
  event.target.style.background = "pink";
});

form.addEventListener("focusout", (event) => {
  event.target.style.background = "";
});

Result

Note: The UI Events specification describes an order of focus events that's different from what current browsers implement.

• Related events: blur, focus, focusout
• Focusing: focus/blur