An event handler is JavaScript code that runs when an event happens. Event handlers can be used to handle and verify user input, user actions, and browser actions:

Jul 11, 2025 · JavaScript Events are actions or occurrences that happen in the browser. They can be triggered by various user interactions or by the browser itself.

Oct 30, 2025 · To react to an event, you attach an event listener to it. This is a code feature that listens out for the event firing. When the event fires, an event handler function (referenced by, or contained …

Learn how to perform event handling in JavaScript including HTML Event Handler attributes, DOM Level 0 Event Handlers, and DOM Level 2 Event Handlers.

Explore all events in JavaScript with examples. Learn how to handle events efficiently with our complete list of JavaScript event types and usage tips.

When an event occur, you can use a JavaScript event handler (or an event listener) to detect them and perform specific task or set of tasks.

Sep 21, 2020 · The browser detects a change, and alerts a function (event handler) that is listening to a particular event. These functions then perform the actions as desired.

Jul 17, 2025 · Learn how JavaScript events and handlers make web pages interactive. From mouse clicks to form inputs, master event-driven programming for responsive, user-friendly websites with …

By handling these events, developers can make their web pages respond to user actions and provide a more engaging experience. In this blog, we will explore the fundamental concepts, usage methods, …

May 20, 2024 · Event Handling in JavaScript is a software routine that processes actions that happen when a user interacts with the page, such as mouse movements and keystrokes.