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Bump version to 5.0.0-alpha1 (#29925)

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Also add v4.5.0 in versions and keep README.md pointing to v4.5.0 so that there are no broken stuff.
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XhmikosR
2020-05-13 22:36:00 +03:00
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---
layout: docs
title: Alerts
description: Provide contextual feedback messages for typical user actions with the handful of available and flexible alert messages.
group: components
aliases:
- "/components/"
- "/docs/5.0/components/"
toc: true
---
## Examples
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](#dismissing).
{{< example >}}
{{< alerts.inline >}}
{{- range (index $.Site.Data "theme-colors") }}
<div class="alert alert-{{ .name }}" role="alert">
A simple {{ .name }} alert—check it out!
</div>{{- end -}}
{{< /alerts.inline >}}
{{< /example >}}
{{< callout info >}}
{{< partial "callout-warning-color-assistive-technologies.md" >}}
{{< /callout >}}
### Link color
Use the `.alert-link` utility class to quickly provide matching colored links within any alert.
{{< example >}}
{{< alerts.inline >}}
{{- range (index $.Site.Data "theme-colors") }}
<div class="alert alert-{{ .name }}" role="alert">
A simple {{ .name }} alert with <a href="#" class="alert-link">an example link</a>. Give it a click if you like.
</div>{{ end -}}
{{< /alerts.inline >}}
{{< /example >}}
### Additional content
Alerts can also contain additional HTML elements like headings, paragraphs and dividers.
{{< example >}}
<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>
{{< /example >}}
### 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 Bootstrap JavaScript.
- Add a [close button]({{< docsref "/components/close-button" >}}) and the `.alert-dismissible` class, which adds extra padding to the right of the alert and positions the close button.
- On the close 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:
{{< example >}}
<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="close" data-dismiss="alert" aria-label="Close">
<span aria-hidden="true">&times;</span>
</button>
</div>
{{< /example >}}
## JavaScript behavior
### Triggers
Enable dismissal of an alert via JavaScript:
{{< highlight js >}}
var alertList = document.querySelectorAll('.alert')
alertList.forEach(function (alert) {
new bootstrap.Alert(alert)
})
{{< /highlight >}}
Or with `data` attributes on a button **within the alert**, as demonstrated above:
{{< highlight html >}}
<button type="button" class="close" data-dismiss="alert" aria-label="Close">
<span aria-hidden="true">&times;</span>
</button>
{{< /highlight >}}
Note that closing an alert will remove it from the DOM.
### Methods
You can create an alert instance with the alert constructor, for example:
{{< highlight js >}}
var myAlert = document.getElementById('myAlert')
var bsAlert = new bootstrap.Alert(myAlert)
{{< /highlight >}}
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.)
<table class="table">
<thead>
<tr>
<th>Method</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<code>close</code>
</td>
<td>
Closes an alert by removing it from the DOM. If the <code>.fade</code> and <code>.show</code> classes are present on the element, the alert will fade out before it is removed.
</td>
</tr>
<tr>
<td>
<code>dispose</code>
</td>
<td>
Destroys an element's alert.
</td>
</tr>
<tr>
<td>
<code>getInstance</code>
</td>
<td>
Static method which allows you to get the alert instance associated to a DOM element, you can use it like this: <code>bootstrap.Alert.getInstance(alert)</code>
</td>
</tr>
</tbody>
</table>
{{< highlight js >}}
var alertNode = document.querySelector('.alert')
var alert = bootstrap.Alert.getInstance(alertNode)
alert.close()
{{< /highlight >}}
### Events
Bootstrap's alert plugin exposes a few events for hooking into alert functionality.
<table class="table">
<thead>
<tr>
<th>Event</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>close.bs.alert</code></td>
<td>
Fires immediately when the <code>close</code> instance method is called.
</td>
</tr>
<tr>
<td><code>closed.bs.alert</code></td>
<td>
Fired when the alert has been closed and CSS transitions have completed.
</td>
</tr>
</tbody>
</table>
{{< highlight js >}}
var myAlert = document.getElementById('myAlert')
myAlert.addEventListener('closed.bs.alert', function () {
// do something…
})
{{< /highlight >}}