Bootstrap - Liste déroulante des boutons

Ce chapitre explique comment ajouter un menu déroulant aux boutons à l'aide des classes Bootstrap. Pour ajouter une liste déroulante à un bouton, enveloppez simplement le bouton et le menu déroulant dans un.btn-group. Vous pouvez également utiliser <span class = "caret"> </span> pour indiquer que le bouton est une liste déroulante.

L'exemple suivant illustre une liste déroulante de base à un seul bouton -

<div class = "btn-group">
   
   <button type = "button" class = "btn btn-default dropdown-toggle" data-toggle = "dropdown">
      Default 
      <span class = "caret"></span>
   </button>
   
   <ul class = "dropdown-menu" role = "menu">
      <li><a href = "#">Action</a></li>
      <li><a href = "#">Another action</a></li>
      <li><a href = "#">Something else here</a></li>
      
      <li class = "divider"></li>
      <li><a href = "#">Separated link</a></li>
   </ul>
</div>

<div class = "btn-group">
   <button type = "button" class = "btn btn-primary dropdown-toggle" data-toggle = "dropdown">
      Primary 
      <span class = "caret"></span>
   </button>
   
   <ul class = "dropdown-menu" role = "menu">
      <li><a href = "#">Action</a></li>
      <li><a href = "#">Another action</a></li>
      <li><a href = "#">Something else here</a></li>
      
      <li class = "divider"></li>
      <li><a href = "#">Separated link</a></li>
   </ul>
   
</div>

Liste déroulante des boutons de fractionnement

Les listes déroulantes des boutons de fractionnement utilisent le même style général que le bouton déroulant mais ajoutent une action principale avec la liste déroulante. Les boutons de fractionnement ont l'action principale sur la gauche et une bascule sur la droite qui affiche la liste déroulante.

<div class = "btn-group">
   <button type = "button" class = "btn btn-default">Default</button>
   
   <button type = "button" class = "btn btn-default dropdown-toggle" data-toggle = "dropdown">
      <span class = "caret"></span>
      <span class = "sr-only">Toggle Dropdown</span>
   </button>
   
   <ul class = "dropdown-menu" role = "menu">
      <li><a href = "#">Action</a></li>
      <li><a href = "#">Another action</a></li>
      <li><a href = "#">Something else here</a></li>
      
      <li class = "divider"></li>
      <li><a href = "#">Separated link</a></li>
   </ul>
</div>

<div class = "btn-group">
   <button type = "button" class = "btn btn-primary">Primary</button>
   
   <button type = "button" class = "btn btn-primary dropdown-toggle" data-toggle = "dropdown">
      <span class = "caret"></span>
      <span class = "sr-only">Toggle Dropdown</span>
   </button>
   
   <ul class = "dropdown-menu" role = "menu">
      <li><a href = "#">Action</a></li>
      <li><a href = "#">Another action</a></li>
      <li><a href = "#">Something else here</a></li>
      
      <li class = "divider"></li>
      <li><a href = "#">Separated link</a></li>
   </ul>
</div>

Taille de la liste déroulante du bouton

Vous pouvez utiliser les listes déroulantes avec n'importe quelle taille de bouton - .btn-large, .btn-sm, ou .btn-xs.

<div class = "btn-group">
   
   <button type = "button" class = "btn btn-default dropdown-toggle btn-lg" data-toggle = "dropdown">
      Default
      <span class = "caret"></span>
   </button>
   
   <ul class = "dropdown-menu" role = "menu">
      <li><a href = "#">Action</a></li>
      <li><a href = "#">Another action</a></li>
      <li><a href = "#">Something else here</a></li>
      
      <li class = "divider"></li>
      <li><a href = "#">Separated link</a></li>
   </ul>
</div>

<div class = "btn-group">
   <button type = "button" class = "btn btn-primary dropdown-toggle btn-sm" data-toggle = "dropdown">
      Primary
      <span class = "caret"></span>
   </button>
   
   <ul class = "dropdown-menu" role = "menu">
      <li><a href = "#">Action</a></li>
      <li><a href = "#">Another action</a></li>
      <li><a href = "#">Something else here</a></li>
      
      <li class = "divider"></li>
      <li><a href = "#">Separated link</a></li>
   </ul>
</div>

<div class = "btn-group">
   <button type = "button" class = "btn btn-success dropdown-toggle btn-xs" data-toggle = "dropdown">
      Success
      <span class = "caret"></span>
   </button>
   
   <ul class = "dropdown-menu" role = "menu">
      <li><a href = "#">Action</a></li>
      <li><a href = "#">Another action</a></li>
      <li><a href = "#">Something else here</a></li>
      
      <li class = "divider"></li>
      <li><a href = "#">Separated link</a></li>
   </ul>
   
</div>

Variante Dropup

Les menus peuvent également être créés pour être déroulés vers le haut plutôt que vers le bas. Pour y parvenir, ajoutez simplement.dropup au parent .btn-group récipient.

<div class = "row" style = "margin-left:50px; margin-top:200px">
   
   <div class = "btn-group dropup">
      <button type = "button" class = "btn btn-default dropdown-toggle" data-toggle = "dropdown">
         Default
         <span class = "caret"></span>
      </button>
      
      <ul class = "dropdown-menu" role = "menu">
         <li><a href = "#">Action</a></li>
         <li><a href = "#">Another action</a></li>
         <li><a href = "#">Something else here</a></li>
         
         <li class = "divider"></li>
         <li><a href = "#">Separated link</a></li>
      </ul>
   </div>
   
   <div class = "btn-group dropup">
      <button type = "button" class = "btn btn-primary dropdown-toggle" data-toggle = "dropdown">
         Primary
         <span class = "caret"></span>
      </button>
      
      <ul class = "dropdown-menu" role = "menu">
         <li><a href = "#">Action</a></li>
         <li><a href = "#">Another action</a></li>
         <li><a href = "#">Something else here</a></li>
         
         <li class = "divider"></li>
         <li><a href = "#">Separated link</a></li>
      </ul>
   </div>
   
</div>