Bootstrap carousel not showing images - javascript

I'm trying to make a carousel which browses through the images in an image folder. A script automatically adds the items to the carousel based on the images present. The images are labelled 1, 2, 3, and so on.
But no matter what I try, the carousel doesn't show the image. I've tried converting the images to different format. The images are originally JFIF.
Here's my code:
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<title>Edexcel International GCSE (9-1) Human Biology Student Book | Scotch's Pirated Book Reader (PBR) v3.6</title>
<link rel="stylesheet" href="css/bootstrap.css" />
</head>
<body onLoad="load()" style="margin-top: 10px;">
<div class="container">
<div style="text-align: center; line-height: 2px;">
<h4>Image browser</h4>
<p>Coded by someone</p>
</div><br /><br />
<div id="pageCarousel" class="carousel slide" data-ride="carousel" data-interval="false">
<div class="carousel-inner" role="listbox" id="carousel-inner">
<!-- GONNA BE FILLED BY THE SCRIPT -->
</div>
<a class="carousel-control-prev" href="#pageCarousel" role="button" data-slide="prev">
<span class="carousel-control-prev-icon bg-primary" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a class="carousel-control-next" href="#pageCarousel" role="button" data-slide="next">
<span class="carousel-control-next-icon bg-primary" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>
</div>
</div>
<script src="js/jquery-3.3.1.slim.min.js"></script>
<script src="js/popper.min.js"></script>
<script src="js/bootstrap.js"></script>
<script src="js/new.js"></script>
</body>
</html>
The new.js file has the script which loads the images into the carousel. A basic summary of what it does is:
'use strict';
function load()
{
var index = 2; // The first image is named 2.jfif
var carousel_innerHTML = "";
while (index < 278) // There are 277 images
{
carousel_innerHTML = carousel_innerHTML + makeEntry(index);
index++;
}
document.getElementById('carousel-inner').innerHTML = carousel_innerHTML;
}
function makeEntry(index)
{
return '<!-- AUTO GENERATED CODE --> <div class="carousel-item"><img class="d-block mx-auto" src="assets/' + index + '.jfif" alt="' + index + '" /></div>\n';
}

You were missing a couple things:
You need to add an active class to the first div in the carousel-inner div
You should initialize the carousel when finished loading the images. $('#pageCarousel').carousel({interval: 3000});
Here is a working example for you.
'use strict';
// for this example
var images = ["","","https://upload.wikimedia.org/wikipedia/commons/c/c9/10150811_677994762257483_131131840_n_677994762257483.jpg", "https://upload.wikimedia.org/wikipedia/commons/1/1b/10603847_756710051052620_5858255939401577860_o_756710051052620.jpg","https://upload.wikimedia.org/wikipedia/commons/6/6a/1073115_556203904436570_702830415_o_556203904436570.jpg"]
function load() {
var index = 2; // The first image is named 2.jfif
var carousel_innerHTML = "";
while (index < 5) // There are 277 images
{
carousel_innerHTML = carousel_innerHTML + makeEntry(index);
index++;
}
document.getElementById('carousel-inner').innerHTML = carousel_innerHTML;
$('#pageCarousel').carousel({interval: 3000});
}
function makeEntry(index) {
var first = index === 2 ? "active" : "";
return '<!-- AUTO GENERATED CODE --> <div class="carousel-item ' + first + '"><img class="d-block mx-auto" src="' + images[index] + '" alt="' + index + '" /></div>\n';
}
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<body onLoad="load()" style="margin-top: 10px;">
<div class="container">
<div style="text-align: center; line-height: 2px;">
<h4>Image browser</h4>
<p>Coded by someone</p>
</div><br /><br />
<div id="pageCarousel" class="carousel slide" data-ride="carousel" data-interval="false">
<div class="carousel-inner" role="listbox" id="carousel-inner">
<!-- GONNA BE FILLED BY THE SCRIPT -->
</div>
<a class="carousel-control-prev" href="#pageCarousel" role="button" data-slide="prev">
<span class="carousel-control-prev-icon bg-primary" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a class="carousel-control-next" href="#pageCarousel" role="button" data-slide="next">
<span class="carousel-control-next-icon bg-primary" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>
</div>
</div>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
</html>

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but if u meant animate the height between different image sizes than u can use this jQuery:
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CODEPEN
Another way you can use javascript to done that.
Example
In that code I add event listener for listen slide.bs.carousel that triggered from bootstrap, get height of active item then animate carousel-inner element height.
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Add style
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<img src="https://cdn.pixabay.com/photo/2016/12/26/15/34/simplicity-1932331_960_720.jpg" alt="...">
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You can make it dynamic this way. This solution will work in any number of carousel you have without any changes :)
$(document).ready(function(){
var myCarousels = $(".carousel");
myCarousels.each(function( index, element ) {
var myCarousel = $("#"+$(element).attr('id'));
myCarousel.append("<ol class='carousel-indicators'></ol>");
var indicators = $("#"+$(element).attr('id') + " .carousel-indicators");
$("#"+$(element).attr('id') +" .carousel-inner").children(".item").each(function(index) {
console.log(index);
(index === 0) ?
indicators.append("<li data-target='#"+$(element).attr('id')+"' data-slide-to='"+index+"' class='active'></li>") :
indicators.append("<li data-target='#"+$(element).attr('id')+"' data-slide-to='"+index+"'></li>");
});
});
});
Here is the working example: https://jsfiddle.net/bhumi/98L5Lu4p/1/
function appendIndicator(carousel)
{
var myCarousel = $(carousel);
myCarousel.append("<ol class='carousel-indicators'></ol>");
var indicators = $(".carousel-indicators");
myCarousel.find(".carousel-inner").children(".item").each(function(index) {
(index === 0) ?
indicators.append("<li data-target='"+ carousel +"' data-slide-to='"+index+"' class='active'></li>") :
indicators.append("<li data-target='" + carousel + "' data-slide-to='"+index+"'></li>");
});
}
$('.carousel').carousel();
appendIndicator('#carousel-1');
appendIndicator('#carousel-2');
Demo JSFiddle

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