{"id":16364,"date":"2022-09-06T06:03:26","date_gmt":"2022-09-06T13:03:26","guid":{"rendered":"https:\/\/coderpad.io\/?p=16364"},"modified":"2023-06-05T14:11:59","modified_gmt":"2023-06-05T21:11:59","slug":"addeventlistener-javascript","status":"publish","type":"post","link":"https:\/\/coderpad.io\/blog\/development\/addeventlistener-javascript\/","title":{"rendered":"AddEventListener JavaScript: What It Is and How To Use It"},"content":{"rendered":"\n

JavaScript event listeners (or event handlers) are essential in web development. Why? Events constantly occur on your website, and they often change the interface. <\/p>\n\n\n\n

Event handlers provide a built-in solution for configuring activities anytime your page changes. <\/p>\n\n\n\n

In this post, you’ll learn about addEventListener<\/code>, a particular event handler in JavaScript. We’ll cover its definition, syntax, and code example. In the end, you’ll learn how to remove the handler using removeEventlistener<\/code> and some other concepts.<\/p>\n\n\n\n

Let’s get to it. <\/p>\n\n\n\n

What is addEventListener in JavaScript?<\/strong><\/h2>\n\n\n\n

When a user or browser interacts with a webpage, an event<\/em> occurs. Event handlers are used to create a customized piece of code that will run in response to specific events (e.g., opening a pop-up window when a user clicks a button). Some events are user-generated, while some are generated by APIs. <\/p>\n\n\n\n

JavaScript includes a built-in method called addEventListener.<\/strong><\/code> It’s a DOM Level 2<\/a> event handler. You can use it to attach an event handler to a specific element. It in no way replaces the existing event handlers.<\/em> <\/p>\n\n\n\n

addEventListener<\/code> makes adding many event handlers to one element easy — it lets you respond to events associated with an element via an event handler function. The change<\/code> effect is an example of an event. You can attach an event handler to any DOM object. <\/p>\n\n\n

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AddEventListener syntax in JavaScript<\/strong><\/h2>\n\n\n\n

Let’s take a look at the syntax: target.addEventListener(event, function, useCapture)<\/code> <\/p>\n\n\n\n

addEventListener<\/code> has three parameters. event<\/code> and function<\/code> are most frequently used. useCapture<\/code> is used occasionally. <\/p>\n\n\n\n

Here’s what all that syntax means:<\/p>\n\n\n\n