Use Boosted’s JavaScript modal plugin to add dialogs to your site for lightboxes, user notifications, or completely custom content.

How it works

Before getting started with Boosted’s modal component, be sure to read the following as our menu options have recently changed.

  • Modals are built with HTML, CSS, and JavaScript. They’re positioned over everything else in the document and remove scroll from the <body> so that modal content scrolls instead.
  • Clicking on the modal “backdrop” will automatically close the modal.
  • Boosted only supports one modal window at a time. Nested modals aren’t supported as we believe them to be poor user experiences.
  • Modals use position: fixed, which can sometimes be a bit particular about its rendering. Whenever possible, place your modal HTML in a top-level position to avoid potential interference from other elements. You’ll likely run into issues when nesting a .modal within another fixed element.
  • Once again, due to position: fixed, there are some caveats with using modals on mobile devices. See our browser support docs for details.
  • Due to how HTML5 defines its semantics, the autofocus HTML attribute has no effect in Boosted modals. To achieve the same effect, use some custom JavaScript:
var myModal = document.getElementById('myModal')
var myInput = document.getElementById('myInput')

myModal.addEventListener('shown.bs.modal', function () {
  myInput.focus()
})
The animation effect of this component is dependent on the prefers-reduced-motion media query. See the reduced motion section of our accessibility documentation.

Keep reading for demos and usage guidelines.

Examples

Below is a static modal example (meaning its position and display have been overridden). Included are the modal header, modal body (required for padding), and modal footer (optional). We ask that you include modal headers with dismiss actions whenever possible, or provide another explicit dismiss action.

<div class="modal" tabindex="-1">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title">Modal title</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal"><span class="visually-hidden">Close</span></button>
      </div>
      <div class="modal-body">
        <p>Modal body text goes here.</p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

With image

Modals may start with a picture. Add .modal-img to your <img> or <svg> tag—being .modal-content’s first child— and you’re done!

<div class="modal" tabindex="-1">
  <div class="modal-dialog">
    <div class="modal-content">
      <img class="modal-img" src="..." alt="...">
      <div class="modal-header">
        <h5 class="modal-title">Modal title</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal"><span class="visually-hidden">Close</span></button>
      </div>
      <div class="modal-body">
        <p>Modal body text goes here.</p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

Live demo

Toggle a working modal demo by clicking the button below. It will slide down and fade in from the top of the page.

<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#exampleModal">
  Launch demo modal
</button>

<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal"><span class="visually-hidden">Close</span></button>
      </div>
      <div class="modal-body">
        ...
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

Static backdrop

When backdrop is set to static, the modal will not close when clicking outside it. Click the button below to try it.

<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#staticBackdrop">
  Launch static backdrop modal
</button>

<!-- Modal -->
<div class="modal fade" id="staticBackdrop" data-bs-backdrop="static" data-bs-keyboard="false" tabindex="-1" aria-labelledby="staticBackdropLabel" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="staticBackdropLabel">Modal title</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal"><span class="visually-hidden">Close</span></button>
      </div>
      <div class="modal-body">
        ...
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Understood</button>
      </div>
    </div>
  </div>
</div>

Scrolling long content

When modals become too long for the user’s viewport or device, they scroll independent of the page itself. Try the demo below to see what we mean.

You can also create a scrollable modal that allows scroll the modal body by adding .modal-dialog-scrollable to .modal-dialog.

<!-- Scrollable modal -->
<div class="modal-dialog modal-dialog-scrollable">
  ...
</div>

Vertically centered

Add .modal-dialog-centered to .modal-dialog to vertically center the modal.

<!-- Vertically centered modal -->
<div class="modal-dialog modal-dialog-centered">
  ...
</div>

<!-- Vertically centered scrollable modal -->
<div class="modal-dialog modal-dialog-centered modal-dialog-scrollable">
  ...
</div>

Tooltips and popovers

Tooltips and popovers can be placed within modals as needed. When modals are closed, any tooltips and popovers within are also automatically dismissed.

<div class="modal-body">
  <h5>Popover in a modal</h5>
  <p>This <a href="#" role="button" class="btn btn-secondary popover-test" title="Popover title" data-bs-content="Popover body content is set in this attribute.">button</a> triggers a popover on click.</p>
  <hr>
  <h5>Tooltips in a modal</h5>
  <p><a href="#" class="tooltip-test" title="Tooltip">This link</a> and <a href="#" class="tooltip-test" title="Tooltip">that link</a> have tooltips on hover.</p>
</div>

Using the grid

Utilize the Boosted grid system within a modal by nesting .container-fluid within the .modal-body. Then, use the normal grid system classes as you would anywhere else.

<div class="modal-body">
  <div class="container-fluid">
    <div class="row">
      <div class="col-md-4">.col-md-4</div>
      <div class="col-md-4 ms-auto">.col-md-4 .ms-auto</div>
    </div>
    <div class="row">
      <div class="col-md-3 ms-auto">.col-md-3 .ms-auto</div>
      <div class="col-md-2 ms-auto">.col-md-2 .ms-auto</div>
    </div>
    <div class="row">
      <div class="col-md-6 ms-auto">.col-md-6 .ms-auto</div>
    </div>
    <div class="row">
      <div class="col-sm-9">
        Level 1: .col-sm-9
        <div class="row">
          <div class="col-8 col-sm-6">
            Level 2: .col-8 .col-sm-6
          </div>
          <div class="col-4 col-sm-6">
            Level 2: .col-4 .col-sm-6
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

Varying modal content

Have a bunch of buttons that all trigger the same modal with slightly different contents? Use event.relatedTarget and HTML data-bs-* attributes to vary the contents of the modal depending on which button was clicked.

Below is a live demo followed by example HTML and JavaScript. For more information, read the modal events docs for details on relatedTarget.

<button type="button" class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#exampleModal" data-bs-whatever="@mdo">Open modal for @mdo</button>
<button type="button" class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#exampleModal" data-bs-whatever="@fat">Open modal for @fat</button>
<button type="button" class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#exampleModal" data-bs-whatever="@getbootstrap">Open modal for @getbootstrap</button>

<div class="modal fade" id="exampleModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLabel">New message</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal"><span class="visually-hidden">Close</span></button>
      </div>
      <div class="modal-body">
        <form>
          <div class="mb-3">
            <label for="recipient-name" class="col-form-label">Recipient:</label>
            <input type="text" class="form-control" id="recipient-name">
          </div>
          <div class="mb-3">
            <label for="message-text" class="col-form-label">Message:</label>
            <textarea class="form-control" id="message-text"></textarea>
          </div>
        </form>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Send message</button>
      </div>
    </div>
  </div>
</div>
var exampleModal = document.getElementById('exampleModal')
exampleModal.addEventListener('show.bs.modal', function (event) {
  // Button that triggered the modal
  var button = event.relatedTarget
  // Extract info from data-bs-* attributes
  var recipient = button.getAttribute('data-bs-whatever')
  // If necessary, you could initiate an AJAX request here
  // and then do the updating in a callback.
  //
  // Update the modal's content.
  var modalTitle = exampleModal.querySelector('.modal-title')
  var modalBodyInput = exampleModal.querySelector('.modal-body input')

  modalTitle.textContent = 'New message to ' + recipient
  modalBodyInput.value = recipient
})

Toggle between modals

Toggle between multiple modals with some clever placement of the data-bs-target and data-bs-toggle attributes. For example, you could toggle a password reset modal from within an already open sign in modal. Please note multiple modals cannot be open at the same time—this method simply toggles between two separate modals.

Open first modal
<div class="modal fade" id="exampleModalToggle" aria-hidden="true" aria-labelledby="exampleModalToggleLabel" tabindex="-1">
  <div class="modal-dialog modal-dialog-centered">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalToggleLabel">Modal 1</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
      </div>
      <div class="modal-body">
        Show a second modal and hide this one with the button below.
      </div>
      <div class="modal-footer">
        <button class="btn btn-primary" data-bs-target="#exampleModalToggle2" data-bs-toggle="modal" data-bs-dismiss="modal">Open second modal</button>
      </div>
    </div>
  </div>
</div>
<div class="modal fade" id="exampleModalToggle2" aria-hidden="true" aria-labelledby="exampleModalToggleLabel2" tabindex="-1">
  <div class="modal-dialog modal-dialog-centered">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalToggleLabel2">Modal 2</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
      </div>
      <div class="modal-body">
        Hide this modal and show the first with the button below.
      </div>
      <div class="modal-footer">
        <button class="btn btn-primary" data-bs-target="#exampleModalToggle" data-bs-toggle="modal" data-bs-dismiss="modal">Back to first</button>
      </div>
    </div>
  </div>
</div>
<a class="btn btn-primary" data-bs-toggle="modal" href="#exampleModalToggle" role="button">Open first modal</a>

Change animation

The $modal-fade-transform variable determines the transform state of .modal-dialog before the modal fade-in animation, the $modal-show-transform variable determines the transform of .modal-dialog at the end of the modal fade-in animation.

If you want for example a zoom-in animation, you can set $modal-fade-transform: scale(.8).

Remove animation

For modals that simply appear rather than fade in to view, remove the .fade class from your modal markup.

<div class="modal" tabindex="-1" aria-labelledby="..." aria-hidden="true">
  ...
</div>

Dynamic heights

If the height of a modal changes while it is open, you should call myModal.handleUpdate() to readjust the modal’s position in case a scrollbar appears.

Accessibility

Be sure to add aria-labelledby="...", referencing the modal title, to .modal. Additionally, you may give a description of your modal dialog with aria-describedby on .modal. Note that you don’t need to add role="dialog" since we already add it via JavaScript.

Embedding YouTube videos

Embedding YouTube videos in modals requires additional JavaScript not in Boosted to automatically stop playback and more. See this helpful Stack Overflow post for more information.

Optional sizes

Modals have three optional sizes, available via modifier classes to be placed on a .modal-dialog. These sizes kick in at certain breakpoints to avoid horizontal scrollbars on narrower viewports.

Size Class Modal max-width
Small .modal-sm 300px
Default None 460px
Large .modal-lg 700px
Extra large .modal-xl 940px

Our default modal without modifier class constitutes the “medium” size modal.

<div class="modal-dialog modal-xl">...</div>
<div class="modal-dialog modal-lg">...</div>
<div class="modal-dialog modal-sm">...</div>

Fullscreen Modal

Another override is the option to pop up a modal that covers the user viewport, available via modifier classes that are placed on a .modal-dialog.

Class Availability
.modal-fullscreen Always
.modal-fullscreen-sm-down Below 480px
.modal-fullscreen-md-down Below 768px
.modal-fullscreen-lg-down Below 1024px
.modal-fullscreen-xl-down Below 1280px
.modal-fullscreen-xxl-down Below 1440px
<!-- Full screen modal -->
<div class="modal-dialog modal-fullscreen-sm-down">
  ...
</div>

Sass

Variables

$modal-inner-padding:               $spacer / 2 $spacer;

$modal-footer-margin-between:       $spacer / 2;
$modal-footer-padding:              $spacer / 2 subtract($spacer, $modal-footer-margin-between / 2) 0; // Boosted mod

$modal-dialog-margin:               $spacer / 2;
$modal-dialog-margin-y-sm-up:       $spacer * 1.5;

$modal-title-line-height:           $line-height-base;

$modal-content-padding-y:           $spacer; // Boosted mod
$modal-content-padding-x:           0; // Boosted mod
$modal-content-padding:             $modal-content-padding-y $modal-content-padding-x; // Boosted mod
$modal-content-color:               null;
$modal-content-bg:                  $white;
$modal-content-border-color:        $gray-500;
$modal-content-border-width:        $border-width;
$modal-content-border-radius:       $border-radius-lg;
$modal-content-inner-border-radius: $border-radius;
$modal-content-box-shadow-xs:       $box-shadow-sm;
$modal-content-box-shadow-sm-up:    $box-shadow;

$modal-backdrop-bg:                 $black;
$modal-backdrop-opacity:            .5;
$modal-header-border-color:         null;
$modal-footer-border-color:         null;
$modal-header-border-width:         $modal-content-border-width;
$modal-footer-border-width:         $modal-header-border-width;
$modal-header-padding-y:            0;
$modal-header-padding-x:            $spacer;
$modal-header-padding:              $modal-header-padding-y $modal-header-padding-x; // Keep this for backwards compatibility

// Boosted mod
//// Scrollable modal
$modal-scrollable-inner-padding:    $spacer;
$modal-scrollable-inner-margin:     $spacer 0 $spacer / 2;

//// Modal with top image
$modal-img-margin:                  -$modal-content-padding-y 0 $modal-content-padding-y; // Boosted mod
$modal-img-btn-close-offset:        $modal-content-padding-y;
// End mod

$modal-sm:                          300px;
$modal-md:                          460px;
$modal-lg:                          700px;
$modal-xl:                          940px;

$modal-fade-transform:              translate(0, -50px);
$modal-show-transform:              none;
$modal-transition:                  transform .3s ease-out;
$modal-scale-transform:             scale(1.02);

Loop

Responsive fullscreen modals are generated via the $breakpoints map and a loop in scss/_modal.scss.

@each $breakpoint in map-keys($grid-breakpoints) {
  $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
  $postfix: if($infix != "", $infix + "-down", "");

  @include media-breakpoint-down($breakpoint) {
    .modal-fullscreen#{$postfix} {
      width: 100vw;
      max-width: none;
      height: 100%;
      margin: 0;

      .modal-content {
        height: 100%;
        border: 0;
        @include border-radius(0);
      }

      .modal-header {
        @include border-radius(0);
      }

      .modal-body {
        overflow-y: auto;
      }

      .modal-footer {
        @include border-radius(0);
      }
    }
  }
}

Usage

The modal plugin toggles your hidden content on demand, via data attributes or JavaScript. It also adds .modal-open to the <body> to override default scrolling behavior and generates a .modal-backdrop to provide a click area for dismissing shown modals when clicking outside the modal.

Via data attributes

Activate a modal without writing JavaScript. Set data-bs-toggle="modal" on a controller element, like a button, along with a data-bs-target="#foo" or href="#foo" to target a specific modal to toggle.

<button type="button" data-bs-toggle="modal" data-bs-target="#myModal">Launch modal</button>

Via JavaScript

Create a modal with a single line of JavaScript:

var myModal = new boosted.Modal(document.getElementById('myModal'), options)

Options

Options can be passed via data attributes or JavaScript. For data attributes, append the option name to data-bs-, as in data-bs-backdrop="".

Name Type Default Description
backdrop boolean or the string 'static' true Includes a modal-backdrop element. Alternatively, specify static for a backdrop which doesn't close the modal on click.
keyboard boolean true Closes the modal when escape key is pressed
focus boolean true Puts the focus on the modal when initialized.

Methods

Asynchronous methods and transitions

All API methods are asynchronous and start a transition. They return to the caller as soon as the transition is started but before it ends. In addition, a method call on a transitioning component will be ignored.

See our JavaScript documentation for more information.

Passing options

Activates your content as a modal. Accepts an optional options object.

var myModal = new boosted.Modal(document.getElementById('myModal'), {
  keyboard: false
})

toggle

Manually toggles a modal. Returns to the caller before the modal has actually been shown or hidden (i.e. before the shown.bs.modal or hidden.bs.modal event occurs).

myModal.toggle()

show

Manually opens a modal. Returns to the caller before the modal has actually been shown (i.e. before the shown.bs.modal event occurs).

myModal.show()

Also, you can pass a DOM element as an argument that can be received in the modal events (as the relatedTarget property).

var modalToggle = document.getElementById('toggleMyModal') // relatedTarget
myModal.show(modalToggle)

hide

Manually hides a modal. Returns to the caller before the modal has actually been hidden (i.e. before the hidden.bs.modal event occurs).

myModal.hide()

handleUpdate

Manually readjust the modal’s position if the height of a modal changes while it is open (i.e. in case a scrollbar appears).

myModal.handleUpdate()

dispose

Destroys an element’s modal. (Removes stored data on the DOM element)

myModal.dispose()

getInstance

Static method which allows you to get the modal instance associated with a DOM element

var myModalEl = document.getElementById('myModal')
var modal = boosted.Modal.getInstance(myModalEl) // Returns a Boosted modal instance

Events

Boosted’s modal class exposes a few events for hooking into modal functionality. All modal events are fired at the modal itself (i.e. at the <div class="modal">).

Event type Description
show.bs.modal This event fires immediately when the show instance method is called. If caused by a click, the clicked element is available as the relatedTarget property of the event.
shown.bs.modal This event is fired when the modal has been made visible to the user (will wait for CSS transitions to complete). If caused by a click, the clicked element is available as the relatedTarget property of the event.
hide.bs.modal This event is fired immediately when the hide instance method has been called.
hidden.bs.modal This event is fired when the modal has finished being hidden from the user (will wait for CSS transitions to complete).
hidePrevented.bs.modal This event is fired when the modal is shown, its backdrop is static and a click outside the modal or an escape key press is performed with the keyboard option or data-bs-keyboard set to false.
var myModalEl = document.getElementById('myModal')
myModalEl.addEventListener('hidden.bs.modal', function (event) {
  // do something...
})