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Bootstrap alerts

Bootstrap alerts give contextual feedback information for common user operations. Component is delivered with a bunch of usable and adjustable alert messages.

On this page:



Examples

Bootstrap alerts are prepared for any length of the message. For proper styling, use one of required contextual classes: .c-alert-primary, .c-alert-secondary, .c-alert-success, .c-alert-danger, .c-alert-warning, .c-alert-info, .c-alert-light, .c-alert-dark. For inline dismissal, use the alerts JavaScript plugin.

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

<div class="c-alert c-alert-primary" role="alert">
  A simple primary alert—check it out!
</div>
<div class="c-alert c-alert-secondary" role="alert">
  A simple secondary alert—check it out!
</div>
<div class="c-alert c-alert-success" role="alert">
  A simple success alert—check it out!
</div>
<div class="c-alert c-alert-danger" role="alert">
  A simple danger alert—check it out!
</div>
<div class="c-alert c-alert-warning" role="alert">
  A simple warning alert—check it out!
</div>
<div class="c-alert c-alert-info" role="alert">
  A simple info alert—check it out!
</div>
<div class="c-alert c-alert-light" role="alert">
  A simple light alert—check it out!
</div>
<div class="c-alert c-alert-dark" role="alert">
  A simple dark alert—check it out!
</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.

Use the .c-alert-link utility class to immediately give matching colored links inside any alert.

<div class="c-alert c-alert-primary" role="alert">
  A simple primary alert with <a href="#" class="c-alert-link">an example link</a>. Give it a click if you like.
</div>
<div class="c-alert c-alert-secondary" role="alert">
  A simple secondary alert with <a href="#" class="c-alert-link">an example link</a>. Give it a click if you like.
</div>
<div class="c-alert c-alert-success" role="alert">
  A simple success alert with <a href="#" class="c-alert-link">an example link</a>. Give it a click if you like.
</div>
<div class="c-alert c-alert-danger" role="alert">
  A simple danger alert with <a href="#" class="c-alert-link">an example link</a>. Give it a click if you like.
</div>
<div class="c-alert c-alert-warning" role="alert">
  A simple warning alert with <a href="#" class="c-alert-link">an example link</a>. Give it a click if you like.
</div>
<div class="c-alert c-alert-info" role="alert">
  A simple info alert with <a href="#" class="c-alert-link">an example link</a>. Give it a click if you like.
</div>
<div class="c-alert c-alert-light" role="alert">
  A simple light alert with <a href="#" class="c-alert-link">an example link</a>. Give it a click if you like.
</div>
<div class="c-alert c-alert-dark" role="alert">
  A simple dark alert with <a href="#" class="c-alert-link">an example link</a>. Give it a click if you like.
</div>

Additional content

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

<div class="c-alert c-alert-success" role="alert">
  <h4 class="c-alert-heading">Well done!</h4>
  <p>Aww yeah, you successfully read this important alert message. This example text is going to run a bit longer so that you can see how spacing within an alert works with this kind of content.</p>
  <hr>
  <p class="c-mb-0">Whenever you need to, be sure to use margin utilities to keep things nice and tidy.</p>
</div>

Dismissing

Using the JavaScript plugin, it’s possible to remove any alert. Here’s how you can do it:

  • Be sure you’ve loaded the bootstrap alert plugin, or the compiled Bootstrap JavaScript.
  • If you’re building our JavaScript from source, it requires util.js. The compiled version includes this.
  • Add a dismiss button and the .c-alert-dismissible class, which adds extra padding to the right of the alert and positions the .c-close button.
  • On the dismiss button, add the data-dismiss="c-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 .c-fade and .c-show classes.

You can see this in action with a live demo:

<div class="c-alert c-alert-warning alert-dismissible c-fade c-show" role="alert">
  <strong>Holy guacamole!</strong> You should check in on some of those fields below.
  <button type="button" class="c-close" data-dismiss="alert" aria-label="Close">
    <span aria-hidden="true">&times;</span>
  </button>
</div>

JavaScript behavior

Without jQuery

Triggers

Enable dismissal of an alert via JavaScript:

var alertList = document.querySelectorAll('.alert')
alertList.forEach(function (alert) {
  new coreui.Alert(alert)
})

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

<button type="button" class="c-close" data-dismiss="alert" aria-label="Close">
  <span aria-hidden="true">&times;</span>
</button>

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

Methods

You can create an alert instance with the alert constructor, for example:

var myAlert = document.getElementById('myAlert')
var bsAlert = new coreui.Alert(myAlert)

This 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.)

Method Description
close Closes an alert by removing it from the DOM. If the .c-fade and .c-show classes are present on the element, the alert will fade out before it is removed.
dispose Destroys an element’s alert.
_getInstance Static method which allows you to get the alert instance associated to a DOM element, you can use it like this: coreui.Alert._getInstance(alert)
var alertNode = document.querySelector('.alert')
var alert = coreui.Alert._getInstance(alertNode)
alert.c-close()

Events

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

Event Description
close.coreui.alert This event fires immediately when the close instance method is called.
closed.coreui.alert This event is fired when the alert has been closed (will wait for CSS transitions to complete).
var myAlert = document.getElementById('myAlert')
myAlert.addEventListener('closed.coreui.alert', function () {
  // do something…
})

With jQuery

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="c-close" data-dismiss="alert" aria-label="Close">
  <span aria-hidden="true">&times;</span>
</button>

Please note that closing a Bootstrap 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

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

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