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How to create Alerts Bootstrap 4


Bootstrap 4 Provide contextual feedback alert messages:

Bootstrap 4 Alerts

The button with class="close" and data-dismiss="alert" is used to close the alert box.

Example

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap 4 Alert links 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/4.5.2/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
  <h2>Alert Links</h2>
  <div class="alert alert-success">
    <strong>Success!</strong> This is Success alert.
  </div>
  <div class="alert alert-info">
    <strong>Info!</strong> This is Info alert.
  </div>
  <div class="alert alert-warning">
    <strong>Warning!</strong> This is Warning alert.
  </div>
  <div class="alert alert-danger">
    <strong>Danger!</strong> This is Danger alert.
  </div>
  <div class="alert alert-primary">
    <strong>Primary!</strong> This is Primary alert.
  </div>
  <div class="alert alert-secondary">
    <strong>Secondary!</strong> This is Secondary alert.
  </div>
  <div class="alert alert-dark">
    <strong>Dark!</strong> This is Dark alert.
  </div>
  <div class="alert alert-light">
    <strong>Light!</strong> This is Light alert.
  </div>
</div>

</body>
</html>

Close Alert

The button with class="close" and data-dismiss="alert" is used to close the alert box.

Example

        <!DOCTYPE html>
        <html lang="en">
        <head>
          <title>Closing Alerts 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/4.5.2/css/bootstrap.min.css">
          <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
          <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
          <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
        </head>
        <body>

        <div class="container">
          <h2>Closing Alerts</h2>
          <div class="alert alert-success alert-dismissible">
            <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-dismissible">
            <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-dismissible">
            <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-dismissible">
            <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-dismissible">
            <button type="button" class="close" data-dismiss="alert">×</button>
            <strong>Primary!</strong> Indicates an important action.
          </div>
          <div class="alert alert-secondary alert-dismissible">
            <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-dismissible">
            <button type="button" class="close" data-dismiss="alert">×</button>
            <strong>Dark!</strong> Dark grey alert.
          </div>
          <div class="alert alert-light alert-dismissible">
            <button type="button" class="close" data-dismiss="alert">×</button>
            <strong>Light!</strong> Light grey alert.
          </div>
        </div>

        </body>
        </html>

    

Animated Alerts

The .fade and .show classes adds a fading effect when closing the alert message:

Example

    <!DOCTYPE html>
    <html lang="en">
    <head>
      <title>Bootstrap 4 Animated Alerts 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/4.5.2/css/bootstrap.min.css">
      <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
      <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
    </head>
    <body>

    <div class="container">
      <h2>Animated Alerts</h2>
      <div class="alert alert-success alert-dismissible 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-dismissible 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-dismissible 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-dismissible 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-dismissible 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-dismissible 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-dismissible fade show">
        <button type="button" class="close" data-dismiss="alert">×</button>
        <strong>Dark!</strong> Dark grey alert.
      </div>
      <div class="alert alert-light alert-dismissible fade show">
        <button type="button" class="close" data-dismiss="alert">×</button>
        <strong>Light!</strong> Light grey alert.
      </div>
    </div>

    </body>
    </html>