What is Event Capturing in JavaScript | JavaScript Tutorials in Hindi | Interview Question #28

In JavaScript, event capturing is the process of capturing an event in the target element or its ancestors during the event propagation phase.

When an event is triggered in a web page, it goes through a process called “event propagation” or “event bubbling,” which is a mechanism for propagating the event through the DOM tree. Event capturing happens during the first phase of the event propagation process, where the event is captured by the ancestor elements starting from the root of the DOM tree and moving down to the target element.

Event capturing is often used in conjunction with event bubbling, which is the opposite of event capturing. In event bubbling, the event is first captured by the target element and then propagated to its ancestor elements up to the root of the DOM tree.

In JavaScript, you can register event listeners for capturing or bubbling phases using the addEventListener method. To register an event listener for the capturing phase, you need to set the third argument of the addEventListener method to true.

Note that not all events can be captured. Events like mouseenter and mouseleave do not support event capturing.