Explain event delegation in JavaScript

Event delegation is a technique in JavaScript where a single event listener is attached to a parent element instead of attaching event listeners to multiple child elements. When an event occurs on a child element, the event bubbles up the DOM tree, and the parent element's event listener handles the event based on the target element.

Event delegation provides the following benefits:

• Improved performance: Attaching a single event listener is more efficient than attaching multiple event listeners to individual elements, especially for large or dynamic lists. This reduces memory usage and improves overall performance.
• Simplified event handling: With event delegation, you only need to write the event handling logic once in the parent element's event listener. This makes the code more maintainable and easier to update.
• Dynamic element support: Event delegation automatically handles events for dynamically added or removed elements within the parent element. There's no need to manually attach or remove event listeners when the DOM structure changes.

However, do note that:

• It is important to identify the target element that triggered the event.
• Not all events can be delegated because they are not bubbled. Non-bubbling events include: focus, blur, scroll, mouseenter, mouseleave, resize, etc.

<br>

Read the detailed answer on GreatFrontEnd which allows progress tracking, contains more code samples, and useful resources.