Bootstrap 4 - Alertas
Descrição
O componente de alerta especifica a mensagem predefinida para as ações do usuário. É utilizado para enviar informações como mensagens de aviso, erro ou confirmação aos usuários finais.
Você pode criar uma caixa de alerta, adicionando uma classe de .alert e junto com classes contextuais como .alert-sucesso , .alert-info , .alert-warning , .alert-perigo , .alert-primário , .alert-secundário , .alert-light ou .alert-dark .
O exemplo a seguir demonstra o uso das classes contextuais acima -
Exemplo
<html lang = "en">
<head>
<!-- Meta tags -->
<meta charset = "utf-8">
<meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
<!-- Bootstrap CSS -->
<link rel = "stylesheet"
href = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin = "anonymous">
<title>Bootstrap 4 Example</title>
</head>
<body>
<div class = "container">
<h2>Alerts</h2>
<div class = "alert alert-primary" role = "alert">
primary alert - Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-secondary" role = "alert">
secondary alert — Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-success" role = "alert">
success alert — Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-danger" role = "alert">
danger alert — Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-warning" role = "alert">
warning alert — Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-info" role = "alert">
info alert — Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-light" role = "alert">
light alert — Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-dark" role = "alert">
dark alert — Welcome to Tutorialspoint!!!
</div>
</div>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src = "https://code.jquery.com/jquery-3.3.1.slim.min.js"
integrity = "sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
crossorigin = "anonymous">
</script>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"
integrity = "sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49"
crossorigin = "anonymous">
</script>
<script src = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"
integrity = "sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy"
crossorigin = "anonymous">
</script>
</body>
</html>Isso produzirá o seguinte resultado -
Resultado
Links em alertas
Para obter links em alertas, use a classe do utilitário .alert-link na tag <a> conforme mostrado no exemplo abaixo -
Exemplo
<html lang = "en">
<head>
<!-- Meta tags -->
<meta charset = "utf-8">
<meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
<!-- Bootstrap CSS -->
<link rel = "stylesheet"
href = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin = "anonymous">
<title>Bootstrap 4 Example</title>
</head>
<body>
<div class = "container">
<h2>Links in Alerts</h2>
<div class = "alert alert-primary" role = "alert">
primary alert - Welcome to
<a href = "https://www.tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
<div class = "alert alert-secondary" role = "alert">
secondary alert — Welcome to
<a href = "https://www.tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
<div class = "alert alert-success" role = "alert">
success alert — Welcome to
<a href = "https://www.tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
<div class = "alert alert-danger" role = "alert">
danger alert — Welcome to
<a href = "https://www.tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
<div class = "alert alert-warning" role = "alert">
warning alert — Welcome to
<a href = "https://www.tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
<div class = "alert alert-info" role = "alert">
info alert — Welcome to
<a href = "https://www.tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
<div class = "alert alert-light" role = "alert">
light alert — Welcome to
<a href = "https://www.tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
<div class = "alert alert-dark" role = "alert">
<div class = "alert alert-dark" role = "alert">
dark alert — Welcome to
<a href = "https://www.tutorialspoint.com/" target = "_blank"
rel = "nofollow" class = "alert-link">Tutorialspoint!!!</a>
</div>
</div>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src = "https://code.jquery.com/jquery-3.3.1.slim.min.js"
integrity = "sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
crossorigin = "anonymous">
</script>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"
integrity = "sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49"
crossorigin = "anonymous">
</script>
<script src = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"
integrity = "sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy"
crossorigin = "anonymous">
</script>
</body>
</html>Isso produzirá o seguinte resultado -
Resultado
Alertas de dispensa
Para criar um alerta de dispensa, use a classe .alert-dispensable para alertar o contêiner. Adicione o atributo data-CC0 = "alert" no elemento do botão para fechar um botão, que automaticamente descarta a caixa de mensagem de alerta.
O exemplo a seguir demonstra a dispensa da caixa de alerta -
Exemplo
<html lang = "en">
<head>
<!-- Meta tags -->
<meta charset = "utf-8">
<meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
<!-- Bootstrap CSS -->
<link rel = "stylesheet"
href = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin = "anonymous">
<title>Bootstrap 4 Example</title>
</head>
<body>
<div class = "container">
<h2>Dismissal Alerts</h2>
<div class = "alert alert-success alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Success!</strong> Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-primary alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Primary!</strong> Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-secondary alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Secondary!</strong> Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-danger alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Danger!</strong> Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-warning alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Warning!</strong> Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-info alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Info!</strong> Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-light alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Light!</strong> Welcome to Tutorialspoint!!!
</div>
<div class = "alert alert-dark alert-dismissible">
<button type = "button" class = "close" data-dismiss = "alert">×</button>
<strong>Dark!</strong> Welcome to Tutorialspoint!!!
</div>
</div>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src = "https://code.jquery.com/jquery-3.3.1.slim.min.js"
integrity = "sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
crossorigin = "anonymous">
</script>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"
integrity = "sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49"
crossorigin = "anonymous">
</script>
<script src = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"
integrity = "sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy"
crossorigin = "anonymous">
</script>
</body>
</html>Isso produzirá o seguinte resultado -