Creating a uniform height for images in a Bootstrap 4 carousel across various sizes and screen dimensions

Here is an example of a carousel provided by w3schools:

<div id="demo" class="carousel slide" data-ride="carousel">

  <!-- Indicators -->
  <ul class="carousel-indicators">
    <li data-target="#demo" data-slide-to="0" class="active"></li>
    <li data-target="#demo" data-slide-to="1"></li>
    <li data-target="#demo" data-slide-to="2"></li>
  </ul>

  <!-- The slideshow -->
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img src="la.jpg" alt="Los Angeles">
    </div>
    <div class="carousel-item">
      <img src="chicago.jpg" alt="Chicago">
    </div>
    <div class="carousel-item">
      <img src="ny.jpg" alt="New York">
    </div>
  </div>

  <!-- Left and right controls -->
  <a class="carousel-control-prev" href="#demo" data-slide="prev">
    <span class="carousel-control-prev-icon"></span>
  </a>
  <a class="carousel-control-next" href="#demo" data-slide="next">
    <span class="carousel-control-next-icon"></span>
  </a>

</div>

To ensure the carousel is responsive, I have included the following CSS:

.carousel-item-next, .carousel-item-prev, .carousel-item.active {
    display: block !important;
}

In my website, most images have the same dimensions (300px height and 600px width), except for one image which has different proportions (300px height and 300px width). To address this, I used the following CSS rule:

.carousel-item>img{
    max-height: 300px;
}

This approach ensures that all images in the carousel have consistent heights. However, when resizing the page or viewing it on smaller devices, the varying widths of the images may cause fluctuations in the height of the carousel. How can I maintain a consistent height for all images, regardless of their dimensions?

Answer №1

I found a practical solution that has been effective for me when dealing with media queries. Here is what worked:

@media (max-width: 688px) {
    .carousel-item>img {
        max-height: 146px;
    }
}

To determine the appropriate max-height value, I used the inspect element feature.

Answer №2

For those looking to implement this in bootstrap 5.2.0, here's the solution:

<div class="carousel-inner">
  <div class="carousel-item active">
    <div class="d-flex justify-content-center align-items-center" style="height: 300px">
      <img src="..." class="h-100 w-auto" alt="...">
    </div>
  </div>
  ...
</div>

Answer №3

This is an excellent demonstration that utilizes jQuery:

https://codepen.io/mohan-aiyer/pen/MzgvbN

// This function ensures all carousel items are set to the same height function normalizeCarouselHeights() {

    let heights = []; // create an empty array to store height values
    let tallest; // variable to track the tallest slide
    
    function calculateHeights() {
        jQuery('.parab .carousel-inner .carousel-item').each(function() { // add heights to the array
            heights.push(jQuery(this).outerHeight());
        });
        tallest = Math.max.apply(null, heights); // cache the largest value
        jQuery('.parab .carousel-inner .carousel-item').each(function() {
            jQuery(this).css('min-height', tallest + 'px');
        });
    }
    calculateHeights();

    jQuery(window).on('resize orientationchange', function () {
        
        tallest = 0; 
        heights.length = 0; // reset vars
        jQuery('.parab .carousel-inner .carousel-item').each(function() {
            jQuery(this).css('min-height','0'); // reset min-height
        }); 
        
        calculateHeights(); // run it again 

    });
    
}

jQuery( document ).ready(function() {
    normalizeCarouselHeights();
});

Answer №4

To ensure that images fit all screen sizes, I have discovered that cropping all images to the same size is the most effective solution.

For this purpose, I utilized an online tool called https://pixlr.com/editor/.

By using the crop icon and selecting an aspect ratio of 1200x480, I was able to successfully crop my images.

This approach has effectively resolved the issue of images not fitting properly on different screens for me.

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