"Lightbox (Modal Image Gallery) - Working Moodle 3.3.3 - WIP"
Bootstrap 3.0.0 Snippet by dgcruzing

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<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="row">
<h3>10.12.17 Still working on this within Moodle as it is screwing up the Moodle Modal code</h3>
<h3>Lightbox (Modal Image Gallery) - this is working in Moodle but I havent got the postioning right. If you want to add it and play add both the CSS and JAVA Script to your Custom area</h3>
</div>
</div>
<div class="editor-indent" style="margin-left: 20px; padding: 0 0 0 40px; margin-right: 50px">
<div class="container-fluid">
<div class="row-fluid">
<div class="column">
<img src="https://www.w3schools.com/howto/img_nature_wide.jpg" onclick="openModal();currentSlide(1)" class="hover-shadow">
</div>
<div class="column">
<img src="https://www.w3schools.com/howto/img_fjords_wide.jpg" onclick="openModal();currentSlide(2)" class="hover-shadow">
</div>
<div class="column">
<img src="https://www.w3schools.com/howto/img_mountains_wide.jpg" onclick="openModal();currentSlide(3)" class="hover-shadow">
</div>
<div class="column">
<img src="https://www.w3schools.com/howto/img_lights_wide.jpg" onclick="openModal();currentSlide(4)" class="hover-shadow">
</div>
</div>
<div id="myModal" class="modal" style="display: none;">
<span class="close cursor" onclick="closeModal()">×</span>
<div class="modal-content">
<div class="mySlides" style="display: none;">
<div class="numbertext">1 / 4</div>
<img src="https://www.w3schools.com/howto/img_nature_wide.jpg" style="width:100%">
</div>
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/* for Modal setout */
/* dg added */
.modal {
position: fixed;
top: 10%;
left: 50%;
z-index: 1050;
width: 560px;
margin-left: 0px;
background-color: #fff;
border: 1px solid #999;
border-radius: 6px;
box-shadow: 0 3px 7px rgba(0,0,0,.3);
background-clip: padding-box;
outline: 0;
}
/* dg added */
body {
font-family: Verdana, sans-serif;
margin: 0;
}
* {
box-sizing: border-box;
}
.row > .column {
padding: 0 8px;
}
.row:after {
content: "";
display: table;
clear: both;
}
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<script>
function openModal() {
document.getElementById('myModal').style.display = "block";
}
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);
}
function showSlides(n) {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("demo");
var captionText = document.getElementById("caption");
if (n > slides.length) {slideIndex = 1}
if (n < 1) {slideIndex = slides.length}
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex-1].style.display = "block";
dots[slideIndex-1].className += " active";
captionText.innerHTML = dots[slideIndex-1].alt;
}
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