How TO – Lightbox

Learn how to create a modal image gallery (lightbox) with CSS and JavaScript.

Lightbox (Modal Image Gallery)

The following example combines code from Modals and Slideshows to create the lightbox.

Step 1) Add HTML:

Example

<!– Images used to open the lightbox –>
<div class=”row”>
  <div class=”column”>
    <img src=”img1.jpg” onclick=”openModal();currentSlide(1)” class=”hover-shadow”>
  </div>
  <div class=”column”>
    <img src=”img2.jpg” onclick=”openModal();currentSlide(2)” class=”hover-shadow”>
  </div>
  <div class=”column”>
    <img src=”img3.jpg” onclick=”openModal();currentSlide(3)” class=”hover-shadow”>
  </div>
  <div class=”column”>
    <img src=”img4.jpg” onclick=”openModal();currentSlide(4)” class=”hover-shadow”>
  </div>
</div>

<!– The Modal/Lightbox –>
<div id=”myModal” class=”modal”>
<span class=”close cursor” onclick=”closeModal()”>×</span>
<div class=”modal-content”>

    <!– Next/previous controls –>
    <a class=”prev” onclick=”plusSlides(-1)”>❮</a>
    <a class=”next” onclick=”plusSlides(1)”>❯</a>

    <!– Caption text –>
    <div class=”caption-container”>
      <p id=”caption”></p>
    </div>

    <!– Thumbnail image controls –>
    <div class=”column”>
      <img class=”demo” src=”img1.jpg” onclick=”currentSlide(1)” alt=”Nature”>
    </div>

Step 2) Add CSS:

.row > .column {
padding: 0 8px;
}

.row:after {
content: “”;
display: table;
clear: both;
}

/* Create four equal columns that floats next to eachother */
.column {
float: left;
width: 25%;
}

/* The Modal (background) */
.modal {
display: none;
position: fixed;
z-index: 1;
padding-top: 100px;
left: 0;
top: 0;
width: 100%;
height: 100%;
overflow: auto;
background-color: black;
}

/* Modal Content */
.modal-content {
position: relative;
background-color: #fefefe;
margin: auto;
padding: 0;
width: 90%;
max-width: 1200px;
}

/* The Close Button */
.close {
color: white;
position: absolute;
top: 10px;
right: 25px;
font-size: 35px;
font-weight: bold;
}

.close:hover,
.close:focus {
color: #999;
text-decoration: none;
cursor: pointer;
}

/* Hide the slides by default */
.mySlides {
display: none;
}

/* Next & previous buttons */
.prev,
.next {
cursor: pointer;
position: absolute;
top: 50%;
width: auto;
padding: 16px;
margin-top: -50px;
color: white;
font-weight: bold;
font-size: 20px;
transition: 0.6s ease;
border-radius: 0 3px 3px 0;
user-select: none;
-webkit-user-select: none;
}

/* Position the “next button” to the right */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}

/* On hover, add a black background color with a little bit see-through */
.prev:hover,
.next:hover {
background-color: rgba(0, 0, 0, 0.8);
}

/* Number text (1/3 etc) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}

/* Caption text */
.caption-container {
text-align: center;
background-color: black;
padding: 2px 16px;
color: white;
}

img.demo {
opacity: 0.6;
}

.active,
.demo:hover {
opacity: 1;
}

img.hover-shadow {
transition: 0.3s;
}

.hover-shadow:hover {
box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

Step 3) Add JavaScript:

Example

<!DOCTYPE html>
<html>
<meta name=”viewport” content=”width=device-width, initial-scale=1″>
<style>
body {
font-family: Verdana, sans-serif;
margin: 0;
}

* {
box-sizing: border-box;
}

.row > .column {
padding: 0 8px;
}

.row:after {
content: “”;
display: table;
clear: both;
}

.column {
float: left;
width: 25%;
}

/* The Modal (background) */
.modal {
display: none;
position: fixed;
z-index: 1;
padding-top: 100px;
left: 0;
top: 0;
width: 100%;
height: 100%;
overflow: auto;
background-color: black;
}

/* Modal Content */
.modal-content {
position: relative;
background-color: #fefefe;
margin: auto;
padding: 0;
width: 90%;
max-width: 1200px;
}

/* The Close Button */
.close {
color: white;
position: absolute;
top: 10px;
right: 25px;
font-size: 35px;
font-weight: bold;
}

.close:hover,
.close:focus {
color: #999;
text-decoration: none;
cursor: pointer;
}

.mySlides {
display: none;
}

.cursor {
cursor: pointer;
}

/* Position the “next button” to the right */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}

/* On hover, add a black background color with a little bit see-through */
.prev:hover,
.next:hover {
background-color: rgba(0, 0, 0, 0.8);
}

/* Number text (1/3 etc) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}

img {
margin-bottom: -4px;
}

.caption-container {
text-align: center;
background-color: black;
padding: 2px 16px;
color: white;
}

.demo {
opacity: 0.6;
}

.active,
.demo:hover {
opacity: 1;
}

img.hover-shadow {
transition: 0.3s;
}

.hover-shadow:hover {
box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}
</style>
<body>

<h2 style=”text-align:center”>Lightbox</h2>

function closeModal() {
document.getElementById(“myModal”).style.display = “none”;
}

var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
showSlides(slideIndex += n);
}

function currentSlide(n) {
showSlides(slideIndex = n);
}

</body>
</html>

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