What is event delegation in JavaScript?

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Event delegation in JavaScript is a technique that allows you to handle events efficiently by using a single event listener on a parent element to manage events triggered by its child elements. Instead of adding an event listener to each individual child, you "delegate" the handling to a common ancestor.

This works because of event bubbling, a process where an event triggered on a child element bubbles up through its ancestors in the DOM tree. With event delegation, you attach the listener to a parent, and inside the handler, you check which child element actually triggered the event using properties like event.target.

Advantages of event delegation:

• Improved performance: Fewer event listeners mean less memory usage and faster execution.

• Dynamic content support: It works with elements added after the page loads.

• Simplified code: One listener can replace many.

Event delegation is commonly used for lists, tables, or dynamically generated UI components. It’s an essential pattern for writing efficient, maintainable JavaScript, especially when dealing with many similar elements.

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