How to toggle Dark/Light Mode using JavaScript

#webdev #javascript #beginners #tutorial

Hello, I am back with a new amazing article on Toggle Dark / Light Mode

Let's get started 🚀

Libraries used

Fontawesome
Bootstrap
Create index.html

<div class="container">
        <div class="header d-flex justify-content-between">
            <h1 class="title mt-2">Catty's Blog</h1>
            <span class="mt-4 fs-3 dark toggle"><i class="fas fa-moon d-none" id="dark" title="Switch to Dark Mode"></i></span>          
            <span class="mt-4 fs-3 light toggle" id="light"><i class="fas fa-sun" title="Switch to Light Mode"></i></span>          
        </div>
        <center>
            <div class="main">
                <div class="">
                    <img src="assets/cat-2.webp" class="catty mt-2 rounded-circle" alt="I am Catty">
                    <div class="card-body">
                        <h1 class="card-title">
                            Hello there, I am <a href="http://github.com/snowbit-coderboi" target="_blank" class="catty-name text-decoration-none" id="cattyName">Catty</a>
                        </h1>
                        <p class="info">
                            Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
                        </p>
                    </div>
                </div>
            </div>
        </center>
    </div>

In style.css

@import url('https://fonts.googleapis.com/css2?family=Amatic+SC:wght@700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Sacramento&display=swap');
body{
    background-color: #212224;
    color: #fff;
    transition: 0.5s;
    -webkit-transition: 0.5s;
    -moz-transition: 0.5s;
    -ms-transition: 0.5s;
    -o-transition: 0.5s;
}

.title{
    font-family: 'Amatic SC', cursive;
    font-size: 60px;
    user-select: none;
}

.toggle{
    cursor: pointer;
    transition: 0.5s;
    -webkit-transition: 0.70s;
    -moz-transition: 0.70s;
    -ms-transition: 0.70s;
    -o-transition: 0.70s;
}
#light:hover{
    color: yellow;
}

.catty-name{
    color: #fff;
    transition: 0.3s;
    -webkit-transition: 0.3s;
    -moz-transition: 0.3s;
    -ms-transition: 0.3s;
    -o-transition: 0.3s;
}
.catty-name:hover{
    color: #fff;
    transition: 0.7s;
    -webkit-transition: 0.7s;
    -moz-transition: 0.7s;
    -ms-transition: 0.7s;
    -o-transition: 0.7s;
    font-size: 70px;
}
.main{
    margin-bottom: 15px;
    margin-top: 20px;
}
.card-title{
    font-family: 'Sacramento', cursive;
    font-size: 60px;
}
.card-list{
    /* font-family: 'Sacramento', cursive; */
    font-size: 30px;
    list-style: none;
}
.card-list li:before { content: '😸'; margin-left: -10px; margin-right: 10px; } 

.catty{
    max-height: 200px;
    object-fit: contain;
    /* transform: rotate(20deg); */
    transition: 0.70s;
    -webkit-transition: 0.70s;
    -moz-transition: 0.70s;
    -ms-transition: 0.70s;
    -o-transition: 0.70s;
}
.catty:hover{
    transition: 0.70s;
  -webkit-transition: 0.70s;
  -moz-transition: 0.70s;
  -ms-transition: 0.70s;
  -o-transition: 0.70s;
  -webkit-transform: rotate(350deg);
  -moz-transform: rotate(350deg);
  -o-transform: rotate(350deg);
  -ms-transform: rotate(350deg);
  transform: rotate(360deg);
}
.catty{
    max-height: 200px;
    object-fit: contain;
    /* transform: rotate(20deg); */
    transition: 0.70s;
    -webkit-transition: 0.70s;
    -moz-transition: 0.70s;
    -ms-transition: 0.70s;
    -o-transition: 0.70s;
}
.info{
    text-align: justify;
    line-height: 2em;
    max-width: 900px;
    font-size: 18px;
}

In index.js

const dark = document.getElementById('dark')
const light = document.getElementById('light')
const catty = document.getElementById('cattyName')

function toggleDark(){
    dark.classList.add('d-none')
    light.classList.remove('d-none')
    document.body.style.backgroundColor = "#212224"
    document.body.style.color = "#fff"
    catty.style.color = "#fff"
}

dark.addEventListener('click', toggleDark)

function toggleLight(){
    light.classList.add('d-none')
    dark.classList.remove('d-none')
    document.body.style.backgroundColor = "#fff"
    document.body.style.color = "#000"
    catty.style.color = "#000"
}
light.addEventListener('click', toggleLight)

Check out the live demo: https://snowbit-coderboi.github.io/dark-light-toggle/

Download Code / Assets: https://github.com/snowbit-coderboi/dark-light-toggle

By the way check out my new youtube video: https://youtu.be/R4DfuhfcHUE

I hope you liked this post; And make sure to share the feedback 🙂 in comment sections

Top comments (3)

Robert Grembowicz • Nov 16 '21

Currently you don't need prefix for css transition and transform. All browsers support this :). In js file both functions to toggle, could be write in one funcion with parameter to change like: toggle('dark')