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Bootstrap 5 Alerts

Alerts

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

Other frameworks

CoreUI components are available as native Angular, React, and Vue components. To learn more please visit the following pages.

On this page

Examples

Bootstrap alert is prepared for any length of text, as well as an optional close button. For a styling, use one of the required contextual classes (e.g., .alert-success). For inline dismissal, use the alerts JavaScript plugin.

A simple primary alert—check it out!

A simple secondary alert—check it out!

A simple success alert—check it out!

A simple danger alert—check it out!

A simple warning alert—check it out!

A simple info alert—check it out!

A simple light alert—check it out!

A simple dark alert—check it out!

html

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

Live example

Click the button below to show an alert (hidden with inline styles to start), then dismiss (and destroy) it with the built-in close button.

html

<div id="liveAlertPlaceholder"></div>
<button type="button" class="btn btn-primary" id="liveAlertBtn">Show live alert</button>

We use the following JavaScript to trigger our live alert demo:

docs/assets/js/snippets.js

const alertPlaceholder = document.getElementById('liveAlertPlaceholder')
const appendAlert = (message, type) => {
  const wrapper = document.createElement('div')
  wrapper.innerHTML = [
    `<div class="alert alert-${type} alert-dismissible" role="alert">`,
    `   <div>${message}</div>`,
    '   <button type="button" class="btn-close" data-coreui-dismiss="alert" aria-label="Close"></button>',
    '</div>'
  ].join('')

  alertPlaceholder.append(wrapper)
}

const alertTrigger = document.getElementById('liveAlertBtn')
if (alertTrigger) {
  alertTrigger.addEventListener('click', () => {
    appendAlert('Nice, you triggered this alert message!', 'success')
  })
}

Link color

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

A simple primary alert with an example link. Give it a click if you like.

A simple secondary alert with an example link. Give it a click if you like.

A simple success alert with an example link. Give it a click if you like.

A simple danger alert with an example link. Give it a click if you like.

A simple warning alert with an example link. Give it a click if you like.

A simple info alert with an example link. Give it a click if you like.

A simple light alert with an example link. Give it a click if you like.

A simple dark alert with an example link. Give it a click if you like.

html

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

Additional content

Alert can also incorporate supplementary HTML elements like heading, paragraph, and divider.

Well done!

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.

Whenever you need to, be sure to use margin utilities to keep things nice and tidy.

html

<div class="alert alert-success" role="alert">
  <h4 class="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="mb-0">Whenever you need to, be sure to use margin utilities to keep things nice and tidy.</p>
</div>

Icons

Similarly, you can use flexbox utilities and Bootstrap Icons to create alerts with icons. Depending on your icons and content, you may want to add more utilities or custom styles.

An example alert with an icon

html

<div class="alert alert-primary d-flex align-items-center" role="alert">
  <svg xmlns="http://www.w3.org/2000/svg" class="bi bi-exclamation-triangle-fill flex-shrink-0 me-2" viewBox="0 0 16 16" role="img" aria-label="Warning:">
    <path d="M8.982 1.566a1.13 1.13 0 0 0-1.96 0L.165 13.233c-.457.778.091 1.767.98 1.767h13.713c.889 0 1.438-.99.98-1.767L8.982 1.566zM8 5c.535 0 .954.462.9.995l-.35 3.507a.552.552 0 0 1-1.1 0L7.1 5.995A.905.905 0 0 1 8 5zm.002 6a1 1 0 1 1 0 2 1 1 0 0 1 0-2z"/>
  </svg>
  <div>
    An example alert with an icon
  </div>
</div>

Need more than one icon for your alerts? Consider using more Bootstrap Icons and making a local SVG sprite like so to easily reference the same icons repeatedly.

An example alert with an icon

An example success alert with an icon

An example warning alert with an icon

An example danger alert with an icon

html

<svg xmlns="http://www.w3.org/2000/svg" class="d-none">
  <symbol id="check-circle-fill" viewBox="0 0 16 16">
    <path d="M16 8A8 8 0 1 1 0 8a8 8 0 0 1 16 0zm-3.97-3.03a.75.75 0 0 0-1.08.022L7.477 9.417 5.384 7.323a.75.75 0 0 0-1.06 1.06L6.97 11.03a.75.75 0 0 0 1.079-.02l3.992-4.99a.75.75 0 0 0-.01-1.05z"/>
  </symbol>
  <symbol id="info-fill" viewBox="0 0 16 16">
    <path d="M8 16A8 8 0 1 0 8 0a8 8 0 0 0 0 16zm.93-9.412-1 4.705c-.07.34.029.533.304.533.194 0 .487-.07.686-.246l-.088.416c-.287.346-.92.598-1.465.598-.703 0-1.002-.422-.808-1.319l.738-3.468c.064-.293.006-.399-.287-.47l-.451-.081.082-.381 2.29-.287zM8 5.5a1 1 0 1 1 0-2 1 1 0 0 1 0 2z"/>
  </symbol>
  <symbol id="exclamation-triangle-fill" viewBox="0 0 16 16">
    <path d="M8.982 1.566a1.13 1.13 0 0 0-1.96 0L.165 13.233c-.457.778.091 1.767.98 1.767h13.713c.889 0 1.438-.99.98-1.767L8.982 1.566zM8 5c.535 0 .954.462.9.995l-.35 3.507a.552.552 0 0 1-1.1 0L7.1 5.995A.905.905 0 0 1 8 5zm.002 6a1 1 0 1 1 0 2 1 1 0 0 1 0-2z"/>
  </symbol>
</svg>

<div class="alert alert-primary d-flex align-items-center" role="alert">
  <svg class="bi flex-shrink-0 me-2" role="img" aria-label="Info:"><use xlink:href="#info-fill"/></svg>
  <div>
    An example alert with an icon
  </div>
</div>
<div class="alert alert-success d-flex align-items-center" role="alert">
  <svg class="bi flex-shrink-0 me-2" role="img" aria-label="Success:"><use xlink:href="#check-circle-fill"/></svg>
  <div>
    An example success alert with an icon
  </div>
</div>
<div class="alert alert-warning d-flex align-items-center" role="alert">
  <svg class="bi flex-shrink-0 me-2" role="img" aria-label="Warning:"><use xlink:href="#exclamation-triangle-fill"/></svg>
  <div>
    An example warning alert with an icon
  </div>
</div>
<div class="alert alert-danger d-flex align-items-center" role="alert">
  <svg class="bi flex-shrink-0 me-2" role="img" aria-label="Danger:"><use xlink:href="#exclamation-triangle-fill"/></svg>
  <div>
    An example danger alert with an icon
  </div>
</div>

Dismissing

Using the JavaScript plugin, it’s possible to remove any alert.

Be sure you’ve loaded the bootstrap alert plugin or the compiled CoreUI JavaScript.
Add a close button and the .alert-dismissible class, which adds some extra padding to the right of the alert component and positions the .close button.
On the close button, add the data-coreui-dismiss="alert" attribute, which triggers the JavaScript functionality. You have to use the <button> element with it for proper behavior across all devices.
To animate alerts when dismissing them, you have to add the .fade and .show classes.

You can see this in action with a live demo:

Holy guacamole! You should check in on some of those fields below.

html

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

When an alert is dismissed, the element is completely removed from the page structure. If a keyboard user dismisses the alert using the close button, their focus will suddenly be lost and, depending on the browser, reset to the start of the page/document. For this reason, we recommend including additional JavaScript that listens for the closed.coreui.alert event and programmatically sets focus() to the most appropriate location in the page. If you’re planning to move focus to a non-interactive element that normally does not receive focus, make sure to add tabindex="-1" to the element.

JavaScript behavior

Heads up! In our documentation, all examples show standard CoreUI implementation. If you are using a Bootstrap-compatible version of CoreUI, remember to use the following changes:

In the constructor, please use bootstrap instead of coreui. For example, new bootstrap.Alert(...) instead of new coreui.Alert(...)
In events, please use bs instead of coreui, for example close.bs.alert instead of close.coreui.alert
In data attributes, please use bs instead of coreui. For example, data-bs-toggle="..." instead of data-coreui-toggle="..."

Initialize

Initialize elements as alerts

const alertList = document.querySelectorAll('.alert')
const alerts = [...alertList].map(element => new coreui.Alert(element))

For the sole purpose of dismissing an alert, it isn’t necessary to initialize the component manually via the JS API. By making use of data-coreui-dismiss="alert", the component will be initialized automatically and properly dismissed.

See the triggers section for more details.

Triggers

Dismissal can be achieved with the data attribute on a button within the alert as demonstrated below:

<button type="button" class="btn-close" data-coreui-dismiss="alert" aria-label="Close"></button>

or on a button outside the alert using the data-coreui-target as demonstrated below:

<button type="button" class="btn-close" data-coreui-dismiss="alert" data-coreui-target="#my-alert" aria-label="Close"></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:

const cAlert = new coreui.Alert('#myAlert')

This makes an alert listen for click events on descendant elements which have the data-coreui-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 `.fade` and `.show` classes are present on the element, the alert will fade out before it is removed.
`dispose`	Destroys an element’s alert. (Removes stored data on the DOM element)
`getInstance`	Static method which allows you to get the alert instance associated to a DOM element. For example: `coreui.Alert.getInstance(alert)`.
`getOrCreateInstance`	Static method which returns an alert instance associated to a DOM element or create a new one in case it wasn’t initialized. You can use it like this: `coreui.Alert.getOrCreateInstance(element)`.

Basic usage:

const alert = coreui.Alert.getOrCreateInstance('#myAlert')
alert.close()

Events

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

Event	Description
`close.coreui.alert`	Fires immediately when the `close` instance method is called.
`closed.coreui.alert`	Fired when the alert has been closed and CSS transitions have completed.

const myAlert = document.getElementById('myAlert')
myAlert.addEventListener('closed.coreui.alert', event => {
  // do something, for instance, explicitly move focus to the most appropriate element,
  // so it doesn't get lost/reset to the start of the page
  // document.getElementById('...').focus()
})

Customizing

CSS variables

Alerts use local CSS variables on .alert for enhanced real-time customization. Values for the CSS variables are set via Sass, so Sass customization is still supported, too.

scss/_alert.scss

--#{$prefix}alert-bg: transparent;
--#{$prefix}alert-padding-x: #{$alert-padding-x};
--#{$prefix}alert-padding-y: #{$alert-padding-y};
--#{$prefix}alert-margin-bottom: #{$alert-margin-bottom};
--#{$prefix}alert-color: inherit;
--#{$prefix}alert-border-color: transparent;
--#{$prefix}alert-border: #{$alert-border-width} solid var(--#{$prefix}alert-border-color);
--#{$prefix}alert-border-radius: #{$alert-border-radius};
--#{$prefix}alert-link-color: inherit;

SASS variables

scss/_variables.scss

$alert-padding-y:               $spacer;
$alert-padding-x:               $spacer;
$alert-margin-bottom:           1rem;
$alert-border-radius:           var(--#{$prefix}border-radius);
$alert-link-font-weight:        $font-weight-bold;
$alert-border-width:            var(--#{$prefix}border-width);
$alert-dismissible-padding-r:   $alert-padding-x * 3; // 3x covers width of x plus default padding on either side

SASS mixin

Deprecated in v5.0.0

Used in combination with $alert-variants to create contextual modifier classes for our alerts.

scss/mixins/_alert.scss

@mixin alert-variant($background, $border, $color) {
  --#{$prefix}alert-color: #{$color};
  --#{$prefix}alert-bg: #{$background};
  --#{$prefix}alert-border-color: #{$border};
  --#{$prefix}alert-link-color: #{shade-color($color, 20%)};

  @if $enable-gradients {
    background-image: var(--#{$prefix}gradient);
  }

  .alert-link {
    color: var(--#{$prefix}alert-link-color);
  }
}

SASS loop

Loop that generates the modifier classes with the alert-variant() mixin.

scss/_alert.scss

// Generate contextual modifier classes for colorizing the alert.
@each $state in map-keys($theme-colors) {
  .alert-#{$state} {
    --#{$prefix}alert-color: var(--#{$prefix}#{$state}-text-emphasis);
    --#{$prefix}alert-bg: var(--#{$prefix}#{$state}-bg-subtle);
    --#{$prefix}alert-border-color: var(--#{$prefix}#{$state}-border-subtle);
    --#{$prefix}alert-link-color: var(--#{$prefix}#{$state}-text-emphasis);
  }
}