Image Slider in JavaScript Source Code

Image Slider in JavaScript Source Code
Code Snippet:Best Pure JavaScript Images Slider
Author: Moaaz Ahmed
Published: January 10, 2024
Last Updated: January 22, 2024
Downloads: 20,066
License: MIT
Edit Code online: View on CodePen
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This JavaScript source code helps you to create an image slider. It comes with all basic features like slide images with next previous buttons, dots navigation, and slides/images counter. You can easily integrate this code to make a super lightweight image slider.

How to Create Image Slider in JavaScript Source Code

1. First of all, create the HTML structure as follows:

<div class="slider-container">

    <div class="slides fade">
        <div class="slider-numbers">1/4</div>
        <div class="slider-image"><img src="https://image.ibb.co/kpmt3k/background_1.jpg" alt="background_1"></div>
        <div class="slider-caption">Caption 1</div>
    </div> <!-- slider -->

    <div class="slides fade">
        <div class="slider-numbers">2/4</div>
        <div class="slider-image"><img src="https://image.ibb.co/mGxNw5/background_2.jpg" alt="background_2"></div>
        <div class="slider-caption">Caption 2</div>
    </div> <!-- slider -->

    <div class="slides fade">
        <div class="slider-numbers">3/4</div>
        <div class="slider-image"><img src="https://image.ibb.co/gd5gpQ/background_3.jpg" alt="background_3"></div>
        <div class="slider-caption">Caption 3</div>
    </div> <!-- slider -->

    <div class="slides fade">
        <div class="slider-numbers">4/4</div>
        <div class="slider-image"><img src="https://image.ibb.co/jOgXw5/background_4.jpg" alt="background_4"></div>
        <div class="slider-caption">Caption 4</div>
    </div> <!-- slider -->

    <!-- Slider Next and Previous buttons -->
    <a class="prev" onclick="plusIndex(-1)">❮</a>
    <a class="next" onclick="plusIndex(+1)">❯</a>

    <!-- Slider Selection Bullets -->
    <div class="slider-bullets" id="slider-bullets">
        <span class="dots" onclick="currentSlide(1)"></span>
        <span class="dots" onclick="currentSlide(2)"></span>
        <span class="dots" onclick="currentSlide(3)"></span>
        <span class="dots" onclick="currentSlide(4)"></span>
    </div> <!-- Slider Bullets -->

</div>

2. After that, add the following CSS styles to your project:

* {
    box-sizing: border-box;
    font-family: Tahoma, Arial;
    padding: 0px;
    margin: 0px;
}

.slider-container {
    width: 720px;
    margin: auto;
    position: relative;
}

.slider-container .fade {
    animation-name: fade;
    animation-duration: 0.5s;
}

@keyframes fade {
    from {opacity: 0.4}
    to {opacity: 1}
}

.slider-container .slides .slider-numbers {
    position: absolute;
    padding: 15px;
    font-size: 15px;
    color: #FFF
}

.slider-container .slides .slider-caption {
    text-align: center;
    font-size: 20px;
    position: absolute;
    bottom: 15px;
    width: 100%;
    color: #FFF;
    padding: 10px;
}

.slider-container .prev,
.slider-container .next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: #FFF;
    font-weight: bold;
    padding: 10px;
    font-size: 30px;
    text-decoration: none;
}

.slider-container .next {
    right: 0px;
}

.slider-container .prev:hover{
    background: rgba(0, 0, 0, 0.6);
    border-top-right-radius: 3px;
    border-bottom-right-radius: 3px;
    cursor: pointer;
}
.slider-container .next:hover {
    background: rgba(0, 0, 0, 0.6);
    border-top-left-radius: 3px;
    border-bottom-left-radius: 3px;
    cursor: pointer;
}

.slider-container .slider-bullets {
    text-align: center;
}

.slider-container .slider-bullets .dots {
    display: inline-block;
    padding: 5px;
    width: 10px;
    height: 10px;
    background-color: #808080;
    border-radius: 50%;
}

.slider-container .slider-bullets .dots:hover {
    background-color: #383838;
    cursor: pointer;
}

.slider-container .slider-bullets .active {
    background-color: #383838;
}

3. Finally, add the following JavaScript code and done.

var slideIndex = 1;

function showImage(n) { // for Display the first Image
    
    'use strict';
    
    var slide = document.getElementsByClassName('slides'),
        
        dots = document.getElementsByClassName('dots'),
        
        i;
    
    if (n > slide.length) { // to prevent larger values than the slide length
        
        slideIndex = 1;
    }
    
    if (n < 1) { // to avoide negative values
        
        slideIndex = slide.length;
    }
    
    for (i = 0; i < slide.length; i++) { // to make other images dispaly: none
        
        slide[i].style.display = 'none';
    }
    slide[slideIndex - 1].style.display = 'block';
    
    for (i = 0; i < dots.length; i++) { // to remove the active class from other dots
        
        dots[i].className = dots[i].className.replace(' active', '');
    }
    
    dots[slideIndex - 1].className += ' active';
}

showImage(slideIndex);

function plusIndex(n) { // for Next & Prev Actions
    
    'use strict';
    
    showImage(slideIndex += n);
}

function currentSlide(n) { // for Slide Bullets Selection
    
    'use strict';
    
    showImage(slideIndex = n);
}

That’s all! hopefully, you have successfully integrated this image slider code snippet into your project. If you have any questions or facing any issues, feel free to comment below.

1 thought on “Image Slider in JavaScript Source Code”

  1. Hey, i can’t seem to be able to replace any image, because when i do so, the slider disappears completely, i tried both images from a folder and images with links and nothing works, is there a solution you can think of? Thank you.

    Reply

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