Event Listener in JavaScript?

An event listener in JavaScript is used to execute a function when an event happens, such as clicking a button, typing in an input, or moving the mouse.

1. Simple example click me

let button = document.getelementbyId("btn");
button.addEventListener("click", function(){
console.log("hello world");
});

1. Common event listeners

2. • Event When it happens
3. • click User clicks an element
4. • mouseover Mouse moves over an element
5. • mouseout Mouse leaves an element
6. • input Input value changes
7. • change A value is changed and committed
8. • keydown User presses a keyboard key
9. • submit A form is submitted