Changing the opacity of the background when a Bootstrap modal is displayedHere's how you can

While working with a bootstrap modal, I noticed that the background content opacity does not change by default when the modal is open. I attempted to change this using JavaScript:

function showModal() {
  document.getElementById("pageContent").style.opacity = "0.5";
}

However, I encountered an issue where the opacity style would still remain on the pageContent even after the modal was closed. I am aware that this is not the correct approach. Any assistance would be greatly appreciated. Thank you.

The HTML button that triggers the modal is:

<button class="btn glossy-clear" data-toggle="modal" data-target="#modal-display" onclick="showModal()">Clear</button>

Here is the modal code:

<div class="modal fade" id="modal-display">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title">Search results</h4>
      </div>
      <div class="modal-body"> 
        <div class="container">
          <div class="row">
            <div class="col-md-5">Hello</div>
            <div class="col-md-5">i!!!!</div>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

EDIT:

javascriptcsstwitter-bootstrap

Answer №1

If you're looking to adjust the transparency of the modal backdrop...

You can do so by using CSS

.modal-backdrop
{
    opacity:0.5 !important;
}

The use of !important is crucial in ensuring that the opacity remains intact, especially when dealing with Bootstrap in this scenario.

Answer №2

If you want to change the opacity of the modal-backdrop, you can do so in your CSS file by targeting the .in class

.modal-backdrop.in {
    opacity: 0.9;
}

http://jsfiddle.net/UniqueRewrittenURL/1/

Answer №3

One way to enhance the functionality of your modal is by using bootstrap events::

//triggered when the modal is opened
$('#yourModal').on('shown.bs.modal', function (e) {
  $("#pageContent").css({ opacity: 0.5 });
})

//triggered when the modal is closed
$('#yourModal').on('hidden.bs.modal', function (e) {
  $("#pageContent").css({ opacity: 1 });
})

Answer №4

If you are working with Bootstrap 4, keep in mind that the class .modal-backdrop.in has been replaced with .modal-backdrop.show. The fade effect is still maintained.

.modal-backdrop.show {
    opacity: 0.7;
}

Answer №5

When it comes to overriding styles using !important, the downside is that you end up losing the subtle fade in effect.

But fear not, there is an effective trick to adjust the opacity of the modal-backdrop without disrupting the fadeIn effect and without the need for the controversial !important rule. Here's the solution:

.modal-backdrop{
  opacity:0; transition:opacity .2s;
}
.modal-backdrop.in{
  opacity:.7;
}

@sass

.modal-backdrop{
  opacity:0; transition:opacity .2s;
  &.in{opacity:.7;}
}

Simple and efficient.

Answer №6

Merely setting the height to 100% may not resolve the issue if the background page's height exceeds the height of the browser.

Expanding on Bhargavi's response, this method is suitable for cases where the page behind the modal is scrollable.

.modal-backdrop.in
{
    opacity:0.5 !important;
    position:fixed;// By doing this, the backdrop covers the entire scrollable page rather than just the browser height
    height:100%;
}

Answer №7

Here is the code you can use:

$("#your_modal_id").on("shown.bs.modal", function(){
      $('.modal-backdrop.in').css('opacity', '0.9');
});

Answer №8

Utilizing REACT Bootstrap 5 and typescript. After trying numerous methods, none seemed to work for me.

Finally, I found success with the following code:

.fade.modal-backdrop.show{
    opacity: 0.8;
}

If you only want to apply this change to a specific modal, you can add a new backdropClassName style to the component.

In your jsx:

<Modal show={this.show} backdropClassName="newBackdrop" ...>

In your css:

.fade.modal-backdrop.newBackdrop.show{
    opacity: 0.8;
}

Answer №9

Through perseverance and trial, I finally discovered that applying the height: 100% attribute to the .modal-backdrop.in class was the solution. Interestingly, setting the height to 100% caused the opacity to cover the entire page.

Answer №10

When utilizing the less version for compiling Bootstrap, remember to adjust the @modal-backdrop-opacity in your variables override file to $modal-backdrop-opacity for scss.

Answer №11

Using !important in the .modal-backdrop class can disrupt the transition on Bootstrap modals

I successfully modified the modal overlay background by directly editing the bootstrap.min.css file. For those who are using Bootstrap CSS locally (without CDN), you can adjust the background-color property of the .modal-backdrop class.

To adjust the opacity of the modal overlay in Bootstrap 4, locate the .modal-backdrop.show class and modify the opacity value accordingly.

If you wish to customize the transition duration for the modal overlay, add a transition property to the .modal-backdrop.fade class.

For changing the transition duration of the modal itself, adjust the transition values in the .modal.fade .modal-dialog class.

Answer №12

If you're looking to customize Bootstrap 3, you can easily download a custom compiled version and adjust the @modal-backdrop-opacity property. Simply visit:

https://getbootstrap.com/docs/3.4/customize/

On the other hand, customizing Bootstrap 4 entails compiling from the source and overriding the $modal-backdrop-bg variable. You can find detailed instructions at:

https://getbootstrap.com/docs/4.4/getting-started/theming/

For more resources on customizing Bootstrap 4, including a NodeJS workflow for compiling from source and unofficial customizers, you can check out the answers on Bootstrap 4 custom build generator / download.

Answer №13

.lightbox-background {
opacity: 0.7!important;
}

It's working perfectly for my needs.

Answer №14

One solution that proved effective for me was removing the opacity settings from the .modal.backdrop.in class.

.modal-backdrop.in{
   }

Simply updating it to

.modal-backdrop.in{
   }

Answer №15

To adjust the transparency level, simply modify the last value within the rgb function.

In this instance, the transparency level is set to 0.5.

.modal-backdrop {
    background-color: rgb(0, 0, 0, 0.5);
}

Answer №16

This piece of code is designed to function seamlessly alongside:

.popup:before{
   visibility: hidden !important;
}

Answer №17

exploring the latest features of bootstrap 5

    <Modal
      ...
      backdropClassName="opacity-100" // choose from options 0, 25, 75, 100
    >

Answer №18

For the latest version of Bootstrap 5.3, all you have to do is make a small tweak to the body tag and include a CSS selector to target the .modal-backdrop class. Here's how you can do it:

body.modal-open .modal-backdrop {
  opacity: 0.5 !important;
}

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