A naukri.com initiative
Medium
4w
205
Image Credit: Medium
The Mechanics of Event Bubbling and Capturing in JavaScript
- When an event happens in the browser, it travels through the entire DOM tree, following a specific path starting from the top and circling back up.
- The event path includes every ancestor of the target element, determining the order in which event listeners react.
- The event movement involves three main stages: capturing phase, target phase, and bubbling phase.
- During the capturing phase, the browser moves from the top downward through ancestor elements to the interacted element.
- Listeners set for capturing phase have the first chance to respond as the event moves down the DOM.
- The target phase occurs when the event reaches the actual interacted element, allowing direct listeners to react.
- Bubbling phase follows, moving the event upward through ancestor nodes, triggering listeners set without capturing.
- Bubbling facilitates event delegation, enabling parent elements to react without individual listeners on child elements.
- JavaScript provides tools like stopPropagation to halt event propagation and preventDefault to override default browser actions.
- Event delegation reduces the need for multiple listeners by attaching one listener to a common parent element.
Read Full Article
12 Likes
For uninterrupted reading, download the app