How to use Bootstrap Modal

Modal is a responsive popup used to display extra content. That includes prompts, configurations, cookie consents, etc.

To use modal you need:

A trigger (for example a button)
Modal itself

After clicking the trigger (button) the modal is launched

HTML

<!-- Button trigger modal -->
<button
  type="button"
  class="btn btn-primary"
  data-mdb-toggle="modal"
  data-mdb-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-mdb-dismiss="modal"
          aria-label="Close"
        ></button>
      </div>
      <div class="modal-body">...</div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-mdb-dismiss="modal">
          Close
        </button>
        <button type="button" class="btn btn-primary">
          Save changes
        </button>
      </div>
    </div>
  </div>
</div>

Some details:

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.
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:

You can launch the modal via data attributes or via JavaScript

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-mdb-toggle="modal" on a controller element, like a button, along with a data-mdb-target="#foo" or href="#foo" to target a specific modal to toggle.

HTML

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

Via JavaScript

Create a modal with a single line of JavaScript:

const myModal = new mdb.Modal(document.getElementById('myModal'), options)