Provide contextual feedback messages for typical user actions with the handful of available and flexible alert messages.

Examples

Alerts are available for any length of text, as well as an optional dismiss button. For proper styling, use one of the four required contextual classes (e.g., .alert-success). For inline dismissal, use the alerts jQuery plugin.

Boosted also adds a dedicated icon for each contextual class, matching functional colors in palette:

  • success,
  • info,
  • warning,
  • danger.
<div class="alert alert-success" role="alert">
  <span class="alert-icon"><span class="sr-only">Success</span></span>
  <p>Success notification text goes here.</p>
</div>
<div class="alert alert-danger" role="alert">
  <span class="alert-icon"><span class="sr-only">Danger</span></span>
  <p>Error notification text goes here.</p>
</div>
<div class="alert alert-warning" role="alert">
  <span class="alert-icon"><span class="sr-only">Warning</span></span>
  <p>Warning notification text goes here.</p>
</div>
<div class="alert alert-info" role="alert">
  <span class="alert-icon"><span class="sr-only">Info</span></span>
  <p>Information notification text goes here.</p>
</div>
Conveying meaning to assistive technologies

Using color to add meaning only provides a visual indication, which will not be conveyed to users of assistive technologies – such as screen readers. Ensure that information denoted by the color is either obvious from the content itself (e.g. the visible text), or is included through alternative means, such as additional text hidden with the .sr-only class.

Sizes

Alerts come with a smaller variant: .alert-sm.

<div class="alert alert-sm alert-success" role="alert">
  <span class="alert-icon"><span class="sr-only">Success</span></span>
  <p>Success notification text goes here.</p>
</div>
<div class="alert alert-sm alert-danger" role="alert">
  <span class="alert-icon"><span class="sr-only">Danger</span></span>
  <p>Error notification text goes here.</p>
</div>
<div class="alert alert-sm alert-warning" role="alert">
  <span class="alert-icon"><span class="sr-only">Warning</span></span>
  <p>Warning notification text goes here.</p>
</div>
<div class="alert alert-sm alert-info" role="alert">
  <span class="alert-icon"><span class="sr-only">Info</span></span>
  <p>Information notification text goes here.</p>
</div>

Dark background

<div class="bg-dark p-3">
  <div class="alert alert-success" role="alert">
    <span class="alert-icon"><span class="sr-only">Success</span></span>
    <p>Success notification text goes here.</p>
  </div><div class="alert alert-danger" role="alert">
    <span class="alert-icon"><span class="sr-only">Danger</span></span>
    <p>Error notification text goes here.</p>
  </div><div class="alert alert-warning" role="alert">
    <span class="alert-icon"><span class="sr-only">Warning</span></span>
    <p>Warning notification text goes here.</p>
  </div><div class="alert alert-info" role="alert">
    <span class="alert-icon"><span class="sr-only">Info</span></span>
    <p>Information notification text goes here.</p>
  </div>
</div>

Additional content

Alerts can also contain additional HTML elements like headings, paragraphs and dividers.

[comment]: #Boosted mod As of Boosted, it’s recommended to wrap your additional content in a <div> to ensure proper alignment — and, for headings, to always use the .alert-heading class.

<div class="alert alert-success" role="alert">
  <span class="alert-icon"><span class="sr-only">Success</span></span>
  <div>
      <h4 class="alert-heading">Success notification text goes here.</h4>
      <p>Description text goes here.</p>
  </div>
</div>
<div class="alert alert-info" role="alert">
  <span class="alert-icon"><span class="sr-only">Info</span></span>
  <div>
      <h4 class="alert-heading">Information notification text goes here. <a href="#">Action</a></h4>
      <p>Description text goes here.</p>
  </div>
</div>

Dismissing

Using the alert JavaScript plugin, it’s possible to dismiss any alert inline. Here’s how:

  • Be sure you’ve loaded the alert plugin, or the compiled Boosted JavaScript.
  • If you’re building our JavaScript from source, it requires util.js. The compiled version includes this.
  • Add a dismiss button and the .alert-dismissible class, which adds extra padding to the right of the alert and positions the .close button.
  • On the dismiss button, add the data-dismiss="alert" attribute, which triggers the JavaScript functionality. Be sure to use the <button> element with it for proper behavior across all devices.
  • To animate alerts when dismissing them, be sure to add the .fade and .show classes.

You can see this in action with a live demo:

<div class="alert alert-warning alert-dismissible fade show" role="alert">
  <span class="alert-icon"><span class="sr-only">Warning</span></span>
  <p>Warning notification text goes here.</p>
  <button type="button" class="close" data-dismiss="alert">
      <span class="sr-only">Close warning message</span>
  </button>
</div>
<div class="bg-dark p-3">
    <div class="alert alert-lg alert-danger alert-dismissible fade show mb-0" role="alert">
        <span class="alert-icon"><span class="sr-only">Danger</span></span>
        <div>
            <h4 class="alert-heading">Error notification text goes here.</h4>
            <p>Description text goes here.</p>
        </div>
        <button type="button" class="close" data-dismiss="alert">
            <span class="sr-only">Close alert message</span>
        </button>
    </div>
</div>

JavaScript behavior

Triggers

Enable dismissal of an alert via JavaScript:

$('.alert').alert()

Or with data attributes on a button within the alert, as demonstrated above:

<button type="button" class="close" data-dismiss="alert">
    <span class="sr-only">Close confirmation message</span>
</button>

Note that closing an alert will remove it from the DOM.

Methods

Method Description
$().alert() Makes an alert listen for click events on descendant elements which have the data-dismiss="alert" attribute. (Not necessary when using the data-api’s auto-initialization.)
$().alert('close') Closes an alert by removing it from the DOM. If the .fade and .show classes are present on the element, the alert will fade out before it is removed.
$().alert('dispose') Destroys an element’s alert.
$('.alert').alert('close')

Events

Boosted’s alert plugin exposes a few events for hooking into alert functionality.

Event Description
close.bs.alert This event fires immediately when the close instance method is called.
closed.bs.alert This event is fired when the alert has been closed (will wait for CSS transitions to complete).
$('#myAlert').on('closed.bs.alert', function () {
  // do something...
})