How to pass an event object to a function in JavaScript

In this tutorial, we are going to learn about how to pass an event object to a event handler function in JavaScript.

Consider, we have a html button element where the onclick event is attached to it.

<button onclick="checkout()">Click me!</button>

Passing the event object

1. Pass the global event variable as an argument to the event handler function.

<button onclick="checkout(event)">Click me!</button>

2. Now, we can access the event object inside a checkout() function like this.

function checkout(e) {
   e.preventDefault();
   console.log('someone clicked me');
}