Simple Modal with Javascript

This is a note that how to make a simple modal.

<button class=“show-modal”>Show modal </button>

<div class=“modal hidden”>
<button class=“close-modal”>×</button>
<h1>I’m a modal window</h1>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim
veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
commodo consequat. Duis aute irure dolor in reprehenderit in voluptate
velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint
occaecat cupidatat non proident, sunt in culpa qui officia deserunt
mollit anim id est laborum.
</p>
</div>
<div class=“overlay hidden”></div>

.hidden {
display: none;
}

.modal {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width: 70%;
background-color: #fff;
padding: 6rem;
border-radius: 8px;
box-shadow: 0 3rem 5rem rgb(0 0 0 /.3);
z-index: 99;
}

.overlay {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: rgb(0 0 0 /.6);
backdrop-filter: blur(4px);
z-index: 1;
}

‘use strict‘;

const modal = document.querySelector(‘.modal‘);
const overlay = document.querySelector(‘.overlay‘);
const btnCloseModal = document.querySelector(‘.close-modal‘);
const btnOpenModal = document.querySelectorAll(‘.show-modal‘);

const closeModal = function() {
modal.classList.add(‘hidden‘);
overlay.classList.add(‘hidden‘)
}

const openModal = function() {
modal.classList.remove(‘hidden‘);
overlay.classList.remove(‘hidden‘)
}

// if there are many open buttons
for (let i = 0; i < btnOpenModal.length; i++) {
btnOpenModal[i].addEventListener(“click“, openModal);
}

btnCloseModal.addEventListener(“click“, closeModal);
overlay.addEventListener(‘click‘, closeModal);

// keyboard operation (Escape version)
document.addEventListener(‘keydown‘, function(e) {
if(e.key === ‘Escape‘ && !modal.classList.contains(‘hidden‘)) {
closeModal();
}
})