Bootstrap Alerts

Bootstrap Alerts are used to provide an easy way to create predefined alert messages. Alert adds a style to your messages to make it more appealing to the users.

Alerts are created with the .alert class, followed by one of the four contextual classes .alert-success, .alert-info, .alert-warning or .alert-danger:

There are four classes that are used within <div> element for alerts.

.alert-success
.alert-info
.alert-warning
.alert-danger

Example -

<div class="container">
  <h2>Alerts</h2>
  <div class="alert alert-success">
    <strong>Success!</strong> This alert box could indicate a successful or positive action.
  </div>
  <div class="alert alert-info">
    <strong>Info!</strong> This alert box could indicate a neutral informative change or action.
  </div>
  <div class="alert alert-warning">
    <strong>Warning!</strong> This alert box could indicate a warning that might need attention.
  </div>
  <div class="alert alert-danger">
    <strong>Danger!</strong> This alert box could indicate a dangerous or potentially negative action.
  </div>
</div>

</body>
</html>

Bootstrap4 Alert

Bootstrap 4 adds 4 new alerts in Bootstrap Alert defined in Bootstrap 3 tutorial.

These are:

Primary: This alert box indicates an important action.
Secondary: This alert box indicates a less important action.
Dark: Dark grey alert box.
Light: Light grey alert box.

Alerts are created with the .alert class, followed by one of the contextual classes.

List of all contextual classes:

.alert-success
.alert-info
.alert-warning
.alert-danger
.alert-primary
.alert-secondary
.alert-light
.alert-dark

Example -

Alert Links

Add the alert-link class to any links inside the alert box to create "matching colored links":

Example -

<div class="container">
  <h2>Alert Links</h2>
  <p>Add the alert-link class to any links inside the alert box to create "matching colored links".</p>
  <div class="alert alert-success">
    <strong>Success!</strong> You should <a href="#" class="alert-link">read this message</a>.
  </div>
  <div class="alert alert-info">
    <strong>Info!</strong> You should <a href="#" class="alert-link">read this message</a>.
  </div>
  <div class="alert alert-warning">
    <strong>Warning!</strong> You should <a href="#" class="alert-link">read this message</a>.
  </div>
  <div class="alert alert-danger">
    <strong>Danger!</strong> You should <a href="#" class="alert-link">read this message</a>.
  </div>
</div>

</body>
</html>

Closing Alerts

To close the alert message, add a .alert-dismissible class to the alert container. Then add class="close" and data-dismiss="alert" to a link or a button element (when you click on this the alert box will disappear).

Example -

<!DOCTYPE html>  
<html lang="en">  
<head>  
  <title>Bootstrap Example</title>  
  <meta charset="utf-8">  
  <meta name="viewport" content="width=device-width, initial-scale=1">  
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css">  
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>  
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.6/umd/popper.min.js"></script>  
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>  
</head>  
<body>  
  
<div class="container">  
  <h2>Alerts</h2>  
  <div class="alert alert-success alert-dismissable">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Success!</strong> This alert box could indicate a successful or positive action.  
  </div>  
  <div class="alert alert-info alert-dismissable">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Info!</strong> This alert box could indicate a neutral informative change or action.  
  </div>  
  <div class="alert alert-warning alert-dismissable">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Warning!</strong> This alert box could indicate a warning that might need attention.  
  </div>  
  <div class="alert alert-danger alert-dismissable">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Danger!</strong> This alert box could indicate a dangerous or potentially negative action.  
  </div>  
  <div class="alert alert-primary alert-dismissable">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Primary!</strong> Indicates an important action.  
  </div>  
  <div class="alert alert-secondary alert-dismissable">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Secondary!</strong> Indicates a slightly less important action.  
  </div>  
  <div class="alert alert-dark alert-dismissable">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Dark!</strong> Dark grey alert.  
  </div>  
  <div class="alert alert-light alert-dismissable">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Light!</strong> Light grey alert.  
  </div>  
</div>  
  
</body>  
</html>

Animated Alerts

You can use .fade and .show classes to add a fading effect when closing the alert message. Example:

Example -

<!DOCTYPE html>  
<html lang="en">  
<head>  
  <title>Bootstrap Example</title>  
  <meta charset="utf-8">  
  <meta name="viewport" content="width=device-width, initial-scale=1">  
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css">  
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>  
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.6/umd/popper.min.js"></script>  
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>  
</head>  
<body>  
  
<div class="container">  
  <h2>Animated Alerts Example</h2>  
  <div class="alert alert-success alert-dismissable fade show">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Success!</strong> This alert box could indicate a successful or positive action.  
  </div>  
  <div class="alert alert-info alert-dismissable fade show">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Info!</strong> This alert box could indicate a neutral informative change or action.  
  </div>  
  <div class="alert alert-warning alert-dismissable fade show">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Warning!</strong> This alert box could indicate a warning that might need attention.  
  </div>  
  <div class="alert alert-danger alert-dismissable fade show">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Danger!</strong> This alert box could indicate a dangerous or potentially negative action.  
  </div>  
  <div class="alert alert-primary alert-dismissable fade show">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Primary!</strong> Indicates an important action.  
  </div>  
  <div class="alert alert-secondary alert-dismissable fade show">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Secondary!</strong> Indicates a slightly less important action.  
  </div>  
  <div class="alert alert-dark alert-dismissable fade show">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Dark!</strong> Dark grey alert.  
  </div>  
  <div class="alert alert-light alert-dismissable fade show">  
    <button type="button" class="close" data-dismiss="alert">×</button>  
    <strong>Light!</strong> Light grey alert.  
  </div>  
</div>  
  
</body>  
</html>