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:

Dec 19, 2025 · Events are not unique to JavaScript — most programming languages have some kind of event model, and the way the model works often differs from JavaScript's way.

Jan 17, 2026 · JavaScript Events are actions or occurrences that happen in the browser. They can be triggered by various user interactions or by the browser itself.

In this tutorial, you will learn about JavaScript events, its model, and how to handle an event when it occurs.

In some cases, the Browser itself can trigger the events, such as the page load and unload events. When an event occur, you can use a JavaScript event handler (or an event listener) to detect them …

5 days ago · Event itself contains the properties and methods which are common to all events. Many DOM elements can be set up to accept (or "listen" for) these events, and execute code in response …

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