JavaScript Event Handling

Understanding events, event delegation, and the event lifecycle in JavaScript.

What are Events?

Events are actions or occurrences that happen in the browser, such as clicks, keyboard input, page loads, and form submissions. JavaScript allows you to listen for and respond to these events.

Event Listeners

The modern way to handle events is with addEventListener. This method allows you to attach multiple listeners to the same element and provides better control over event handling compared to older inline event handlers.

Event Propagation

Events propagate through the DOM in two phases: capturing (from document to target) and bubbling (from target to document). Understanding propagation is crucial for event delegation and preventing unwanted behavior.

Event Delegation

Event delegation leverages event bubbling to handle events on multiple elements with a single listener. This technique is efficient for dynamic content and reduces memory usage.