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 -

Resultado