Le Tutoriel de Bootstrap Carousel

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1- Bootstrap Carousel

Carousel (Carrousel) est similaire à une diaporama (slidershow). Il permet de mettre facilement du contenu de type image et texte en avant en changeant dynamiquement l'image d'en tête du site et son texte...Le  Carousel de  Bootstrap est un mélange de  CSS qt un peu  Javascript.
Ci-dessous, l'illustration d'un  Carousel. Il permet de tourner quelques images.
Un  Carousel complet obtient une structure décrit comme l'illustration ci-dessous :
Le  Carousel le plus simple ne comprend que des  Item (Slider) et le contenu de chaque  Slider qui est une image. Il ne contient ni des contrôles (Controls) ni des  Indicators.
simple-carousel-example.html
<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <title>Bootstrap Carousel</title>
      <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
   </head>
   <body>
      <div class="container">
         <h4 class="mb-3">Simple Carousel</h4>
         <div id="myCarousel" class="carousel slide border" data-ride="carousel">
            <div class="carousel-inner">
               <div class="carousel-item active">
                  <img class="d-block w-100" src="../images/carousel-img-1.jpg" alt="Panther">
               </div>
               <div class="carousel-item">
                  <img class="d-block w-100" src="../images/carousel-img-2.jpg" alt="Black Cat">
               </div>
               <div class="carousel-item">
                  <img class="d-block w-100" src="../images/carousel-img-3.jpg" alt="Lion">
               </div>
            </div>
         </div>
      </div>
      <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
      <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
   </body>
</html>

2- Carousel et Controls

Un  Carousel normal a des butons  "Next" et  "Previous" qui permettent aux utilisateurs de sauter à un  Slider prochain ou de reculer à un  Slider précédent. Ils sont appelés des Contrôles (Controls).
Carousel with Control
<div id="myCarousel" class="carousel slide border" data-ride="carousel">
   <div class="carousel-inner">
      <div class="carousel-item active">
         <img class="d-block w-100" src="../images/carousel-img-1.jpg" alt="Leopard">
      </div>
      <div class="carousel-item">
         <img class="d-block w-100" src="../images/carousel-img-2.jpg" alt="Cat">
      </div>
      <div class="carousel-item">
         <img class="d-block w-100" src="../images/carousel-img-3.jpg" alt="Lion">
      </div>
   </div>
   <!-- Controls -->
   <a class="carousel-control-prev" href="#myCarousel" role="button" data-slide="prev">
     <span class="carousel-control-prev-icon" aria-hidden="true"></span>
     <span class="sr-only">Previous</span>
   </a>
   <a class="carousel-control-next" href="#myCarousel" role="button" data-slide="next">
     <span class="carousel-control-next-icon" aria-hidden="true"></span>
     <span class="sr-only">Next</span>
   </a>
</div>
L'exemple de personnalisation de  Controls :
Custom Controls
 .carousel-control-prev-icon {
     background-image: url(../images/previous-32.png);
     width: 32px;
     height: 32px;
}
 .carousel-control-next-icon {
     background-image: url(../images/next-32.png);
     width: 32px;
     height: 32px;
}

3- Carousel et Indicators

Indicators comme des  Shortcut permet aux utilisateurs de sauter à un  Item (Slider) précis dans la liste des  Item du  Carousel. Remarque : Les  Item dans  Carousel sont indexés (index) de 0 (0, 1, 2,..)
Carousel Indicators
<div id="myCarousel" class="carousel slide border" data-ride="carousel">
   <!-- Indicators -->
   <ol class="carousel-indicators">
      <li data-target="#myCarousel" data-slide-to="0" class="active"></li>
      <li data-target="#myCarousel" data-slide-to="1"></li>
      <li data-target="#myCarousel" data-slide-to="2"></li>
   </ol>

   ...

</div>
Carousel Indicators
<div id="myCarousel" class="carousel slide border" data-ride="carousel">
   <!-- Indicators -->
   <ol class="carousel-indicators">
      <li data-target="#myCarousel" data-slide-to="0" class="active"></li>
      <li data-target="#myCarousel" data-slide-to="1"></li>
      <li data-target="#myCarousel" data-slide-to="2"></li>
   </ol>
   <div class="carousel-inner">
      <div class="carousel-item active">
         <img class="d-block w-100" src="../images/carousel-img-1.jpg" alt="Leopard">
      </div>
      <div class="carousel-item">
         <img class="d-block w-100" src="../images/carousel-img-2.jpg" alt="Cat">
      </div>
      <div class="carousel-item">
         <img class="d-block w-100" src="../images/carousel-img-3.jpg" alt="Lion">
      </div>
   </div>
   <!-- Controls -->
   <a class="carousel-control-prev" href="#myCarousel" role="button" data-slide="prev">
     <span class="carousel-control-prev-icon" aria-hidden="true"></span>
     <span class="sr-only">Previous</span>
   </a>
   <a class="carousel-control-next" href="#myCarousel" role="button" data-slide="next">
     <span class="carousel-control-next-icon" aria-hidden="true"></span>
     <span class="sr-only">Next</span>
   </a>
</div>
Ci-desous quelques exemple de la personnalisation des  Indicators.

Custom Indicators (1)

Custom Indicators (1)
.carousel-indicators li {
  width: 20px;
  height: 20px;
  border-radius: 100%;
}

Custom Indicators (2)

Custom Indicators (2)
 .carousel-indicators li {
     text-indent: 0px;
     text-align: center;
     color: red;
     margin: 0 2px;
     width: 30px;
     height: 30px;
     border: none;
     border-radius: 100%;
     line-height: 30px;
     background-color: #999;
     transition: all 0.25s ease;
}
 .carousel-indicators .active, .hover {
     margin: 0 2px;
     width: 30px;
     height: 30px;
     background-color: #337ab7;
}
Custom Indicators (2)
<div id="myCarousel" class="carousel slide border" data-ride="carousel">
   <ol class="carousel-indicators">
      <li data-target="#myCarousel" data-slide-to="0" class="active">1</li>
      <li data-target="#myCarousel" data-slide-to="1">2</li>
      <li data-target="#myCarousel" data-slide-to="2">3</li>
   </ol>
   <div class="carousel-inner">
      <div class="carousel-item active">
         <img class="d-block w-100" src="../images/carousel-img-1.jpg" alt="Panther">
      </div>
      <div class="carousel-item">
         <img class="d-block w-100" src="../images/carousel-img-2.jpg" alt="Black Cat">
      </div>
      <div class="carousel-item">
         <img class="d-block w-100" src="../images/carousel-img-3.jpg" alt="Lion">
      </div>
   </div>
   <a class="carousel-control-prev" href="#myCarousel" role="button" data-slide="prev">
   <span class="carousel-control-prev-icon" aria-hidden="true"></span>
   <span class="sr-only">Previous</span>
   </a>
   <a class="carousel-control-next" href="#myCarousel" role="button" data-slide="next">
   <span class="carousel-control-next-icon" aria-hidden="true"></span>
   <span class="sr-only">Next</span>
   </a>
</div>

Custom Indicators (3)

Cutom Indicators (3)
.carousel-indicators {
     position: absolute;
     bottom: 0;
     margin: 0;
     left: 0;
     right: 0;
     width: auto;
}
.carousel-indicators li, .carousel-indicators li.active {
     float: left;
     width: 33%;
     height: 10px;
     margin: 0;
     border-radius: 0;
     border: 0;
     background: #ccc;
}
.carousel-indicators li.active {
     background: orange;
}

4- Carousel et la légende (Caption)

Pour chaque  Slider vous pouvez ajouter des légendes (Caption). Il est facile à le faire en enveloppant votre contenu de légende dans l'étiquette  <div class="carousel-caption">.
Carousel Item with Caption!
<div class="carousel-item">
   <img class="d-block w-100" src="../images/carousel-img-2.jpg" alt="Cat">

   <!--Caption here -->
   <div class="carousel-caption">
      <h5>Black Cat</h5>
      <small>
      A black cat is a domestic cat with black fur that may be a mixed or specific breed
      </small>
   </div>

</div>
Carousel with caption
<div id="myCarousel" class="carousel slide border" data-ride="carousel">
   <div class="carousel-inner">
      <div class="carousel-item active">
         <img class="d-block w-100" src="../images/carousel-img-1.jpg" alt="Leopard">
         <div class="carousel-caption">
            <h5>Leopard</h5>
            <small>
            A black Panther is the melanistic color variant of any big cat species.
            Black Panthers in Asia and Africa are leopards (Panthera pardus).
            </small>
         </div>
      </div>
      <div class="carousel-item">
         <img class="d-block w-100" src="../images/carousel-img-2.jpg" alt="Cat">
         <div class="carousel-caption">
            <h5>Black Cat</h5>
            <small>
            A black cat is a domestic cat with black fur that may be a mixed or specific breed
            </small>
         </div>
      </div>
      <div class="carousel-item">
         <img class="d-block w-100" src="../images/carousel-img-3.jpg" alt="Lion">
         <div class="carousel-caption">
            <h5>Lion</h5>
            <small>
            The lion (Panthera leo) is a species in the cat family (Felidae).
            A muscular, deep-chested cat, it has a short, rounded head, a reduced neck and round ears
            </small>
         </div>
      </div>
   </div>
   <a class="carousel-control-prev" href="#myCarousel" role="button" data-slide="prev">
   <span class="carousel-control-prev-icon" aria-hidden="true"></span>
   <span class="sr-only">Previous</span>
   </a>
   <a class="carousel-control-next" href="#myCarousel" role="button" data-slide="next">
   <span class="carousel-control-next-icon" aria-hidden="true"></span>
   <span class="sr-only">Next</span>
   </a>
</div>
Les légendes devraient être affichées sur des appareils dont la largeur d'écran est grande. Pour des équipements d'écran trop petit, vous pouvez les cacher, ce qui peut être réalisé avec le support de la classe  .d-(sm|md|lg|xl)-block, .d-none.
Classe Description
.d-sm-block .d-none Caption va afficher si la largeur de l'écran de Carousel est >= 567px. Inversement, elle sera cachée.
.d-md-block .d-none Caption va afficher si la largeur de l'écran de Carousel est >= 768px. Inversement, elle sera cachée.
.d-lg-block .d-none Caption va afficher si la largeur de l'écran de Carousel est >= 992px. Inversement, elle sera cachée.
.d-xl-block .d-none Caption va afficher si la largeur de l'écran de Carousel est >= 1200px. Inversement, elle sera cachée.
carousel-responsive-caption-example.html
<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <title>Bootstrap Carousel</title>
      <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
   </head>
   <body>
      <div class="container-fluid">
         <h4 class="mb-3">Responsive Carousel with Caption</h4>
         <p>.carousel-caption .d-none .d-sm-block</p>
         <div id="myCarousel" class="carousel slide border" data-ride="carousel">
            <div class="carousel-inner">
               <div class="carousel-item active">
                  <img class="d-block w-100" src="../images/carousel-img-1.jpg" alt="Leopard">
                  <div class="carousel-caption d-none d-sm-block">
                     <h5>Leopard</h5>
                     <small>
                     A black Panther is the melanistic color variant of any big cat species.
                     Black Panthers in Asia and Africa are leopards (Panthera pardus).
                     </small>
                  </div>
               </div>
               <div class="carousel-item">
                  <img class="d-block w-100" src="../images/carousel-img-2.jpg" alt="Cat">
                  <div class="carousel-caption d-none d-sm-block">
                     <h5>Black Cat</h5>
                     <small>
                     A black cat is a domestic cat with black fur that may be a mixed or specific breed
                     </small>
                  </div>
               </div>
               <div class="carousel-item">
                  <img class="d-block w-100" src="../images/carousel-img-3.jpg" alt="Lion">
                  <div class="carousel-caption d-none d-sm-block">
                     <h5>Lion</h5>
                     <small>
                     The lion (Panthera leo) is a species in the cat family (Felidae).
                     A muscular, deep-chested cat, it has a short, rounded head,
                     a reduced neck and round ears
                     </small>
                  </div>
               </div>
            </div>
            <a class="carousel-control-prev" href="#myCarousel" role="button" data-slide="prev">
            <span class="carousel-control-prev-icon" aria-hidden="true"></span>
            <span class="sr-only">Previous</span>
            </a>
            <a class="carousel-control-next" href="#myCarousel" role="button" data-slide="next">
            <span class="carousel-control-next-icon" aria-hidden="true"></span>
            <span class="sr-only">Next</span>
            </a>
         </div>
      </div>
      <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
      <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
   </body>
</html>

5- Effet (Effect)

Ajoutez la classe .carousel-fade au  Carousel, vous verrez l'effet  fade (Pâlir) lorsque le  Carousel transfère de ce  Slider à un autre  Slider.
.carousel-fade
<div id="myCarousel" class="carousel carousel-fade slide border" data-ride="carousel">
   <div class="carousel-inner">
      <div class="carousel-item active">
         <img class="d-block w-100" src="../images/carousel-img-1.jpg" alt="Leopard">
      </div>
      <div class="carousel-item">
         <img class="d-block w-100" src="../images/carousel-img-2.jpg" alt="Cat">
      </div>
      <div class="carousel-item">
         <img class="d-block w-100" src="../images/carousel-img-3.jpg" alt="Lion">
      </div>
   </div>
   <!-- Controls -->
   <a class="carousel-control-prev" href="#myCarousel" role="button" data-slide="prev">
   <span class="carousel-control-prev-icon" aria-hidden="true"></span>
   <span class="sr-only">Previous</span>
   </a>
   <a class="carousel-control-next" href="#myCarousel" role="button" data-slide="next">
   <span class="carousel-control-next-icon" aria-hidden="true"></span>
   <span class="sr-only">Next</span>
   </a>
</div>

6- Des options pour Carousel

Il y a quelques options que vous pouvez appliquer au  Carousel, par exemple, définissez la durée lorsque le  Carousel suspend temporairement avant de passer au Slider suivant. Les paramètres permet au  Carousel de se tourner (cycle) ou non ....

TODO!!

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