How To Create Custom Event Listeners in JavaScript

How To Create Custom Event Listeners in JavaScript

JavaScript in browser environment uses an Event Driven Architecture. What it means is we can execute our code in response to certain user behaviours like clicking a button or focusing an input.

JavaScript in browser environment uses an Event Driven Architecture. What it means is we can execute our code in response to certain user behaviours like clicking a button or focusing an input.

The important thing here is that DOM (Document Object Model) is a system that provides us the access to interact with the Document and our code is not directly connected. We need our system to be able to respond to different DOM events and event listeners are the way we couple our system to the DOM to make it interactive.

The idea here is to be able to connect two systems to be able to respond to each other’s behaviours.

So let’s say if you have a big code base where you have different independent components doing different tasks, you might want a communication medium between them and that’s where event listeners come to the rescue.

Under such scenarios, we can create our own events and bind our code to it to be triggered later whenever needed.

The glue for such system would be a global object to which we can attach all these functions and refer to them with a key. This key can be later used to trigger these functions at a later point when needed.

The initial task is creating a class that can return you an object with all the methods needed. If you need only one instance, you can also create a simple object for the same.

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