Leveraging Bootstrap 5 to Ensure Consistent Image Heights in Carousels

Currently, I am developing a carousel using Bootstrap 5 and I want all images to have a consistent size regardless of their original dimensions.

Here is the current state of the carousel:

https://i.sstatic.net/TFVdy.png

My goal is for the next image in the carousel to match the height of the first image.

https://i.sstatic.net/yxGAY.png

Below is the HTML code I am using:

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="33515c5c47404741524373061d011d03">[email protected]</a>/dist/css/bootstrap.min.css" integrity="sha384-gH2yIJqKdNHPEq0n4Mqa/HGKIhSkIHeL5AyhkYV8i59U5AR6csBvApHHNl/vI1Bx" crossorigin="anonymous">

<div id="carouselExampleInterval" class="carousel slide" data-bs-ride="carousel">
  <div class="carousel-inner">
    <div class="carousel-item active" data-bs-interval="10000">
      <img src="https://venemergencia.com/assets/Banner_principal_Mapa.8ec397bc.png?avif" class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item" data-bs-interval="2000">
      <img src="https://venemergencia.com/assets/Banner_principal_AVILA.2e5ec20a.png?avif" class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="https://venemergencia.com/assets/Telesalud-COVID-19.1370e3f7.png?avif" class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="https://img.freepik.com/vector-gratis/grupo-personal-medico-que-lleva-iconos-relacionados-salud_53876-43071.jpg?w=2000" class="d-block w-100 img-fluid" alt="...">
    </div>
  </div>
  <button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleInterval" data-bs-slide="prev">
          <span class="carousel-control-prev-icon" aria-hidden="true"></span>
          <span class="visually-hidden">Previous</span>
        </button>
  <button class="carousel-control-next" type="button" data-bs-target="#carouselExampleInterval" data-bs-slide="next">
          <span class="carousel-control-next-icon" aria-hidden="true"></span>
          <span class="visually-hidden">Next</span>
        </button>
</div>

<script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="781a17170c0b0c0a1908384d564a5648">[email protected]</a>/dist/js/bootstrap.bundle.min.js" integrity="sha384-A3rJD856KowSb7dwlZdYEkO39Gagi7vIsF0jrRAoQmDKKtQBHUuLZ9AsSv4jD4Xa" crossorigin="anonymous"></script>
htmlcssbootstrap-5

Answer №1

To achieve the desired shape, we implement a clever technique using a zero-height/padding-bottom trick on the carousel container, absolute positioning covering the full size on the carousel items, and utilize object-fit for the images.

.carousel-inner {
  height: 0;
  padding-bottom: 25%; /* setting the carousel aspect ratio to 4:1 */
}

.carousel-item {
  position: absolute !important; /* Necessary for Bootstrap */
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.carousel-item img {
  height: 100%; /* Width adjustment handled by Bootstrap */
  object-fit: cover; /* Use 'contain' for stretching instead of cropping */
}
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="96f4f9f9e2e5e2e4f7e6d6a3b8a4b8a6">[email protected]</a>/dist/css/bootstrap.min.css" integrity="sha384-gH2yIJqKdNHPEq0n4Mqa/HGKIhSkIHeL5AyhkYV8i59U5AR6csBvApHHNl/vI1Bx" crossorigin="anonymous">

<div id="carouselExampleInterval" class="carousel slide" data-bs-ride="carousel">
  <div class="carousel-inner">
    <div class="carousel-item active" data-bs-interval="10000">
      <img src="https://via.placeholder.com/1200x300" class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item" data-bs-interval="2000">
      <img src="https://via.placeholder.com/600x2000" class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="https://via.placeholder.com/100x300" class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="https://via.placeholder.com/700x300" class="d-block w-100 img-fluid" alt="...">
    </div>
  </div>

  <button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleInterval" data-bs-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Previous</span>
  </button>
  
  <button class="carousel-control-next" type="button" data-bs-target="#carouselExampleInterval" data-bs-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Next</span>
  </button>
</div>

<script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="8ae8e5e5fef9fef8ebfacabfa4b8a4ba">[email protected]</a>/dist/js/bootstrap.bundle.min.js" integrity="sha384-A3rJD856KowSb7dwlZdYEkO39Gagi7vIsF0jrRAoQmDKKtQBHUuLZ9AsSv4jD4Xa" crossorigin="anonymous"></script>

Answer №2

My goal is to ensure that all images are uniform in size, regardless of their original dimensions.

The best approach is to use a background-image for each slide. By avoiding custom size attributes for individual images (which can cause resolution issues), utilizing a background image is the most effective solution.

An optimal solution would involve resizing all photos to conform to the same dimensions.

.first {
  background-image: url('https://venemergencia.com/assets/Banner_principal_Mapa.8ec397bc.png?avif');
}

.second {
  background-image: url('https://venemergencia.com/assets/Banner_principal_AVILA.2e5ec20a.png?avif');
}

.third {
  background-image: url('https://venemergencia.com/assets/Telesalud-COVID-19.1370e3f7.png?avif');
}

.fourth {
  background-image: url('https://img.freepik.com/vector-gratis/grupo-personal-medico-que-lleva-iconos-relacionados-salud_53876-43071.jpg?w=2000');
}

.first,
.second,
.third,
.fourth {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  width: 100%;
  height: 800px;
}
<link href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="1c7e7373686f686e7d6c5c29322c322e">[email protected]</a>/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">

<div id="carouselExampleInterval" class="carousel slide" data-bs-ride="carousel">
  <div class="carousel-inner first">
    <div class="carousel-item active" data-bs-interval="10000"></div>
    <div class="carousel-item second" data-bs-interval="2000"></div>
    <div class="carousel-item third"></div>
    <div class="carousel-item fourth"></div>
  </div>
  <button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleInterval" data-bs-slide="prev">
      <span class="carousel-control-prev-icon" aria-hidden="true"></span>
      <span class="visually-hidden">Previous</span>
    </button>
  <button class="carousel-control-next" type="button" data-bs-target="#carouselExampleInterval" data-bs-slide="next">
      <span class="carousel-control-next-icon" aria-hidden="true"></span>
      <span class="visually-hidden">Next</span>
    </button>
</div>

<script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="70121f1f04030402110030455e405e42">[email protected]</a>/dist/js/bootstrap.bundle.min.js" integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM" crossorigin="anonymous"></script>

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