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twbs--bootstrap/site/docs/4.3/components/modal.md
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docs Modal Use Bootstrap's JavaScript modal plugin to add dialogs to your site for lightboxes, user notifications, or completely custom content. components true

How it works

Before getting started with Bootstrap'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.
  • Bootstrap 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]({{ site.baseurl }}/docs/{{ site.docs_version }}/getting-started/browsers-devices/#modals-and-dropdowns-on-mobile) for details.
  • Due to how HTML5 defines its semantics, the autofocus HTML attribute has no effect in Bootstrap modals. To achieve the same effect, use some custom JavaScript:

{% highlight js %} $('#myModal').on('shown.bs.modal', function () { $('#myInput').trigger('focus') }) {% endhighlight %}

{% include callout-info-prefersreducedmotion.md %}

Keep reading for demos and usage guidelines.

Examples

Modal components

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.

Modal title

Modal body text goes here.

{% highlight html %}

Modal title

Modal body text goes here.

{% endhighlight %}

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.

{% highlight html %}

{% endhighlight %}

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.

{% highlight html %}

{% endhighlight %}

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

{% highlight html %}

{% endhighlight %}

Vertically centered

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

{% highlight html %}

{% endhighlight %}

Tooltips and popovers

[Tooltips]({{ site.baseurl }}/docs/{{ site.docs_version }}/components/tooltips/) and [popovers]({{ site.baseurl }}/docs/{{ site.docs_version }}/components/popovers/) can be placed within modals as needed. When modals are closed, any tooltips and popovers within are also automatically dismissed.

{% highlight html %}

Popover in a modal

This button triggers a popover on click.

Tooltips in a modal

This link and that link have tooltips on hover.

{% endhighlight %}

Using the grid

Utilize the Bootstrap 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.

{% highlight html %}

.col-md-4
.col-md-4 .ml-auto
.col-md-3 .ml-auto
.col-md-2 .ml-auto
.col-md-6 .ml-auto
Level 1: .col-sm-9
Level 2: .col-8 .col-sm-6
Level 2: .col-4 .col-sm-6
{% endhighlight %}

Varying modal content

Have a bunch of buttons that all trigger the same modal with slightly different contents? Use event.relatedTarget and HTML data-* attributes (possibly via jQuery) 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.

{% capture example %}

{% endcapture %} {% include example.html content=example %}

{% highlight js %} $('#exampleModal').on('show.bs.modal', function (event) { var button = $(event.relatedTarget) // Button that triggered the modal var recipient = button.data('whatever') // Extract info from data-* attributes // If necessary, you could initiate an AJAX request here (and then do the updating in a callback). // Update the modal's content. We'll use jQuery here, but you could use a data binding library or other methods instead. var modal = $(this) modal.find('.modal-title').text('New message to ' + recipient) modal.find('.modal-body input').val(recipient) }) {% endhighlight %}

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.

{% highlight html %}

{% endhighlight %}

Dynamic heights

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

Accessibility

Be sure to add role="dialog" and aria-labelledby="...", referencing the modal title, to .modal, and role="document" to the .modal-dialog itself. Additionally, you may give a description of your modal dialog with aria-describedby on .modal.

Embedding YouTube videos

Embedding YouTube videos in modals requires additional JavaScript not in Bootstrap 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 500px
Large .modal-lg 800px
Extra large .modal-xl 1140px

Our default modal without modifier class constitutes the "medium" size modal.

{% highlight html %}

{% endhighlight %}