Alerts are available for any length of text, as well as an optional close button. For proper styling, use one of the eight required contextual classes (e.g., .alert-success). For inline dismissal, use the alerts JavaScript plugin.
alert-variant() Sass mixin is deprecated. Alert variants now have their CSS variables overridden in a Sass loop. <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>
.visually-hidden class. 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.
<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:
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-bs-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')
})
}
Use the .alert-link utility class to quickly provide matching colored links within any alert.
<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>
Alerts can also contain additional HTML elements like headings, paragraphs and dividers.
<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>
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.
<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.
<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>
Using the alert JavaScript plugin, it’s possible to dismiss any alert inline. Here’s how:
.alert-dismissible class, which adds extra padding to the right of the alert and positions the close button.data-bs-dismiss="alert" attribute, which triggers the JavaScript functionality. Be sure to use the <button> element with it for proper behavior across all devices..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"> <strong>Holy guacamole!</strong> You should check in on some of those fields below. <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button> </div>
closed.bs.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. As part of Bootstrap’s evolving CSS variables approach, alerts now 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.
--#{$prefix}alert-bg: transparent;
--#{$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;
$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
Used in combination with $theme-colors to create contextual modifier classes for our alerts.
@mixin alert-variant($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);
}
}
Loop that generates the modifier classes with the alert-variant() mixin.
// 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);
}
}
Initialize elements as alerts
const alertList = document.querySelectorAll('.alert')
const alerts = [...alertList].map(element => new bootstrap.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-bs-dismiss="alert", the component will be initialized automatically and properly dismissed.
See the triggers section for more details.
Dismissal can be achieved with the data-bs-dismiss attribute on a button within the alert as demonstrated below:
<button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
or on a button outside the alert using the additional data-bs-target as demonstrated below:
<button type="button" class="btn-close" data-bs-dismiss="alert" data-bs-target="#my-alert" aria-label="Close"></button>
Note that closing an alert will remove it from the DOM.
You can create an alert instance with the alert constructor, for example:
const bsAlert = new bootstrap.Alert('#myAlert')
This makes an alert listen for click events on descendant elements which have the data-bs-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: bootstrap.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: bootstrap.Alert.getOrCreateInstance(element). |
Basic usage:
const alert = bootstrap.Alert.getOrCreateInstance('#myAlert')
alert.close()
Bootstrap’s alert plugin exposes a few events for hooking into alert functionality.
| Event | Description |
|---|---|
close.bs.alert | Fires immediately when the close instance method is called. |
closed.bs.alert | Fired when the alert has been closed and CSS transitions have completed. |
const myAlert = document.getElementById('myAlert')
myAlert.addEventListener('closed.bs.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()
})
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© 2011–2022 The Bootstrap Authors
Code licensed under the MIT License.
Documentation licensed under the Creative Commons Attribution License v3.0.
https://getbootstrap.com/docs/5.3/components/alerts/