What is event delegation in JavaScript?
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Event delegation in JavaScript is a technique where a single event listener is added to a parent element to manage events on its child elements, rather than attaching individual listeners to each child. It leverages event bubbling, where events triggered on child elements bubble up through their parent elements in the DOM tree.
How It Works:
When an event (like a click) occurs on a child element, it bubbles up to its parent. With event delegation, the parent listens for that event and determines which child triggered it using the event.target property.
In this example, instead of attaching a separate click listener to each .child element, we attach one to #parent and use event.target to identify which child was clicked.
Benefits:
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Performance: Reduces the number of event listeners, especially useful in lists or dynamic content.
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Dynamic Elements: Works for elements added to the DOM after the listener is attached.
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Cleaner Code: Keeps event handling centralized and manageable.
When to Use:
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For lists, tables, or grids with many similar elements.
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When child elements are added/removed dynamically.
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When performance and scalability are concerns.
Event delegation is a powerful pattern for efficient DOM event handling in large or dynamic applications.
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