Apply a CSS class to the initial item in each carousel present on a webpage

I am utilizing Bootstrap 4's carousel to showcase dynamic content. The challenge lies in marking the first item of the carousel with the CSS class ".active". While it is typically added directly in the HTML, it becomes complicated when dealing with dynamic content output. Upon researching, I stumbled upon this discussion: Appending a class to the first div of a set of dynamically created divs

The workaround involves injecting the following JavaScript before the closing body-tag:

$(".carousel-item:first").addClass('active');

This method works effectively for a single carousel on the page. However, if multiple carousels exist, the approach only targets the first instance in the code.

To address this limitation, I've adopted a strategy where each carousel is assigned a unique custom class (carousel1, carousel2, carousel3,...) and incorporated corresponding lines into my JavaScript file like so:

$(".carousel-item.carousel1:first").addClass('active');
$(".carousel-item.carousel2:first").addClass('active');
$(".carousel-item.carousel3:first").addClass('active');

YET: Is there a more versatile JavaScript solution that functions in a generic manner without necessitating individual css classes per carousel?

I appreciate any insights and recommendations provided beforehand.

Bastian

javascriptcarouselbootstrap-4dynamic-content

Answer №1

To efficiently navigate through the carousels on the website, you must iterate through each carousel and specifically target the first .carousel-item within the loop.

The HTML code extracted from BS4 documentation has been replicated three times to simulate a real web page. The CSS rules are used to highlight the 'active' items as the images are not functional in this context on SO.

$(document).ready(function(){
  $('.carousel').each(function(){
    $(this).find('.carousel-item').eq(0).addClass('active');
  });
});
/* for demonstration purposes only */
.carousel {
  border-bottom: 1px solid #ddd;
  margin-bottom : 2em;
  padding-bottom: 2em;
 }
.carousel-item.active img {
  color: green;
  font-size: 3em;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="carousel slide" data-ride="carousel">
  <div class="carousel-inner">
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="First slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Second slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Third slide">
    </div>
  </div>
</div>

<div class="carousel slide" data-ride="carousel">
  <div class="carousel-inner">
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="First slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Second slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Third slide">
    </div>
  </div>
</div>

<div class="carousel slide" data-ride="carousel">
  <div class="carousel-inner">
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="First slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Second slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Third slide">
    </div>
  </div>
</div>

Answer №2

For optimal functionality, it's advisable to assign separate parents to each of the carousel elements. This way, you can effectively utilize the first-of-type selector.

$(".carousel-item:first-of-type").addClass('active');

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