アラート

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

サンプル

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., .alert-success). For inline dismissal, use the alerts jQuery 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!

<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>

支援技術に意図を伝える

色を用いて意図を伝えようとしても、視覚的な表示に終わるだけで、スクリーンリーダーなど支援技術のユーザには伝わりません。色で示された情報が、内容自体（可視テキストなど）から明らかであるか、.sr-only クラスの指定された隠しテキストなどの代替手段を通じて含まれていることを保証してください。

リンクの色

Use the .alert-link utility class to quickly provide matching colored links within 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.

<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>

追加のコンテンツ

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

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.

<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>

閉じるボタン

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.
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.

ライブデモで実際に確認できます：

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

<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>

JavaScript の動作

トリガ

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" aria-label="Close">
  <span aria-hidden="true">&times;</span>
</button>

アラートは閉じると DOM から削除されます。

メソッド

メソッド	説明
`$().alert()`	Makes an alert listen for click events on descendant elements which have the `data-dismiss="alert"` attribute. (Not necessary when using the data-api’s auto-initialization.)
`$().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')

イベント

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

イベント	説明
`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 () {
  // 何かをする…
})