Understanding Events in JavaScript (Beginner Friendly Guide)

Modern websites are interactive. When you click a button, type in a search box, or submit a form, something happens. This behavior is possible because of JavaScript Events. In this blog, we will learn: Introduction to Events How Events Work Common Event Types The Event Object Event Propagation Event Delegation Removing Event Listeners Let’s start. 1. Introduction to Events An event is an action that happens in the browser. Events can be triggered by: User actions Browser actions Examples of events Action Event Clicking a button click Typing in keyboard keydown Submitting a form submit Moving mouse over element mouseover Page loaded load Example <button id="btn">Click Me</button> document.getElementById("btn").addEventListener("click", function(){ alert("Button clicked!"); }); Output When the user clicks the button, an alert message appears. This is called interactivity. Without events, websites would be static like a newspaper page. 2. How Events Work JavaScript uses an eve