Bootstrap - Plugin Scrollspy

Le plugin Scroll spy (auto update nav) vous permet de cibler des sections de la page en fonction de la position de défilement. Dans son implémentation de base, au fur et à mesure que vous faites défiler, vous pouvez ajouter.active classes à la barre de navigation en fonction de la position de défilement.

Si vous souhaitez inclure cette fonctionnalité de plugin individuellement, vous aurez besoin scrollspy.js. Sinon, comme mentionné dans le chapitre Présentation des plugins d'amorçage , vous pouvez inclure bootstrap.js ou le fichier bootstrap.min.js minifié .

Usage

Vous pouvez ajouter un comportement scrollspy à votre navigation dans la barre supérieure -

  • Via data attributes - ajouter data-spy = "scroll"à l'élément que vous souhaitez espionner (généralement le corps). Puis ajoutez l'attributdata-target avec l'ID ou la classe de l'élément parent de tout Bootstrap .navcomposant. Pour que cela fonctionne, vous devez avoir des éléments dans le corps de la page qui ont des ID correspondants des liens que vous espionnez.

<body data-spy = "scroll" data-target = ".navbar-example">
   ...
   <div class = "navbar-example">
      <ul class = "nav nav-tabs">
         ...
      </ul>
   </div>
   ...
</body>
  • Via JavaScript - Vous pouvez appeler le scrollspy avec JavaScript au lieu d'utiliser les attributs de données, en sélectionnant l'élément à espionner, puis en invoquant le .scrollspy() fonction -

$('body').scrollspy({ target: '.navbar-example' })

Exemple

L'exemple suivant montre l'utilisation du plugin scrollspy via des attributs de données -

<nav id = "navbar-example" class = "navbar navbar-default navbar-static" role = "navigation">
   
   <div class = "navbar-header">
      <button class = "navbar-toggle" type = "button" data-toggle = "collapse" 
         data-target = ".bs-js-navbar-scrollspy">
         <span class = "sr-only">Toggle navigation</span>
         <span class = "icon-bar"></span>
         <span class = "icon-bar"></span>
         <span class = "icon-bar"></span>
      </button>
		
      <a class = "navbar-brand" href = "#">Tutorial Name</a>
   </div>
   
   <div class = "collapse navbar-collapse bs-js-navbar-scrollspy">
      <ul class = "nav navbar-nav">
         <li><a href = "#ios">iOS</a></li>
         <li><a href = "#svn">SVN</a></li>
         
         <li class = "dropdown">
            <a href = "#" id = "navbarDrop1" class = "dropdown-toggle" data-toggle = "dropdown">
               Java
               <b class = "caret"></b>
            </a>
            
            <ul class = "dropdown-menu" role = "menu" aria-labelledby = "navbarDrop1">
               <li><a href = "#jmeter" tabindex = "-1">jmeter</a></li>
               <li><a href = "#ejb" tabindex = "-1">ejb</a></li>
               
               <li class = "divider"></li>
               <li><a href = "#spring" tabindex = "-1">spring</a></li>
            </ul>
            
         </li>
      </ul>
   </div>
   
</nav>

<div data-spy = "scroll" data-target = "#navbar-example" data-offset = "0" 
   style = "height:200px; overflow:auto; position: relative;">
   <h4 id = "ios">iOS</h4>
	
   <p>iOS is a mobile operating system developed and distributed by Apple 
      Inc. Originally released in 2007 for the iPhone, iPod Touch, and Apple 
      TV. iOS is derived from OS X, with which it shares the Darwin 
      foundation. iOS is Apple's mobile version of the OS X operating system 
      used on Apple computers.</p>
   
   <h4 id = "svn">SVN</h4>
   
   <p>Apache Subversion which is often abbreviated as SVN, is a software 
      versioning and revision control system distributed under an open source 
      license. Subversion was created by CollabNet Inc. in 2000, but now it 
      is developed as a project of the Apache Software Foundation, and as 
      such is part of a rich community of developers and users.</p>
   
   <h4 id = "jmeter">jMeter</h4>
   
   <p>jMeter is an Open Source testing software. It is 100% pure Java 
      application for load and performance testing.</p>
   
   <h4 id = "ejb">EJB</h4>
   
   <p>Enterprise Java Beans (EJB) is a development architecture for building 
      highly scalable and robust enterprise level applications to be deployed 
      on J2EE compliant Application Server such as JBOSS, Web Logic etc.</p>
   
   <h4 id = "spring">Spring</h4>
   
   <p>Spring framework is an open source Java platform that provides 
      comprehensive infrastructure support for developing robust Java 
      applications very easily and very rapidly.</p>
   
   <p>Spring framework was initially written by Rod Johnson and was first 
      released under the Apache 2.0 license in June 2003.</p>
   
</div>

Options

Les options peuvent être transmises via des attributs de données ou JavaScript. Le tableau suivant répertorie les options -

Nom de l'option Type / Valeur par défaut Nom d'attribut de données La description
décalage nombre Par défaut: 10 décalage de données Pixels à décaler du haut lors du calcul de la position du défilement.

Méthodes

.scrollspy('refresh') - Lors de l'appel de scrollspy via la méthode JavaScript, vous devez appeler le .refreshméthode pour mettre à jour le DOM. Ceci est utile si des éléments du DOM ont changé, c'est-à-dire si vous avez ajouté ou supprimé certains éléments. Voici la syntaxe pour utiliser cette méthode.

$('[data-spy = "scroll"]').each(function () {
   var $spy = $(this).scrollspy('refresh')
})

Exemple

L'exemple suivant montre l'utilisation de .scrollspy('refresh') méthode -

<nav id = "myScrollspy" class = "navbar navbar-default navbar-static" role = "navigation">
   
   <div class = "navbar-header">
      <button class = "navbar-toggle" type = "button" data-toggle = "collapse" 
         data-target = ".bs-js-navbar-scrollspy">
         <span class = "sr-only">Toggle navigation</span>
         <span class = "icon-bar"></span>
         <span class = "icon-bar"></span>
         <span class = "icon-bar"></span>
      </button>
		
      <a class = "navbar-brand" href = "#">Tutorial Name</a>
   </div>
   
   <div class = "collapse navbar-collapse bs-js-navbar-scrollspy">
      <ul class = "nav navbar-nav">
         <li class = "active"><a href = "#ios">iOS</a></li>
         <li><a href = "#svn">SVN</a></li>
         
         <li class = "dropdown">
            <a href = "#" id = "navbarDrop1" class = "dropdown-toggle" data-toggle  = "dropdown">
               Java 
               <b class = "caret"></b>
            </a>
            
            <ul class = "dropdown-menu" role = "menu" aria-labelledby = "navbarDrop1">
               <li><a href = "#jmeter" tabindex = "-1">jmeter</a></li>
               <li><a href = "#ejb" tabindex = "-1">ejb</a></li>
               
               <li class = "divider"></li>
               <li><a href = "#spring" tabindex = "-1">spring</a></li>
            </ul>
            
         </li>
      </ul>
   </div>
   
</nav>

<div data-spy = "scroll" data-target = "#myScrollspy" data-offset = "0"  
   style = "height:200px; overflow:auto; position: relative;">
   
   <div class = "section">
      <h4 id = "ios">iOS<small><a href = "#" onclick = "removeSection(this);">
         &times; Remove this section</a></small>
      </h4>
      
      <p>iOS is a mobile operating system developed and distributed by 
         Apple Inc. Originally released in 2007 for the iPhone, iPod Touch, and 
         Apple TV. iOS is derived from OS X, with which it shares the Darwin 
         foundation. iOS is Apple's mobile version of the OS X operating system
         used on Apple computers.</p>
   </div>
   
   <div class = "section">
      <h4 id = "svn">SVN<small></small></h4>
      <p>Apache Subversion which is often abbreviated as SVN, is a software 
         versioning and revision control system distributed under an open source 
         license. Subversion was created by CollabNet Inc. in 2000, but 
         now it is developed as a project of the Apache Software Foundation, 
         and as such is part of a rich community of developers and users.</p>
   </div>
   
   <div class = "section">
      <h4 id = "jmeter">jMeter<small><a href = "#" onclick = "removeSection(this);">
         &times; Remove this section</a></small>
      </h4>
      
      <p>jMeter is an Open Source testing software. It is 100% pure Java 
         application for load and performance testing.</p>
   </div>
   
   <div class = "section">
      <h4 id = "ejb">EJB</h4>
      
      <p>Enterprise Java Beans (EJB) is a development architecture for 
         building highly scalable and robust enterprise level applications 
         to be deployed on J2EE compliant Application Server such as 
         JBOSS, Web Logic etc.</p>
   </div>
	
   <div class = "section">
      <h4 id = "spring">Spring</h4>
      
      <p>Spring framework is an open source Java platform that provides 
         comprehensive infrastructure support for developing robust Java 
         applications very easily and very rapidly.</p>
      
      <p>Spring framework was initially written by Rod Johnson and was first 
         released under the Apache 2.0 license in June 2003.</p>
   </div>
   
</div>

<script type = "text/javascript">
   $(function(){
      removeSection = function(e) {
         $(e).parents(".section").remove();
         
         $('[data-spy = "scroll"]').each(function () {
            var $spy = $(this).scrollspy('refresh')
         });
      }
      $("#myScrollspy").scrollspy();
   });
</script>

Événements

Le tableau suivant répertorie les événements à utiliser avec scrollspy. Cet événement peut être utilisé pour se connecter à la fonction.

un événement La description Exemple
activate.bs.scrollspy Cet événement se déclenche chaque fois qu'un nouvel élément est activé par le scrollspy.
$('#myScrollspy').on('activate.bs.scrollspy', function () {
   // do something…
})

Exemple

L'exemple suivant montre l'utilisation de activate.bs.scrollspy événement -

<html>
   <head>
      <link rel = "stylesheet" href = "bootstrap/css/bootstrap.min.css">
      <script src = "bootstrap/scripts/jquery.min.js"></script>
      <script src = "bootstrap/js/bootstrap.min.js"></script>
      
      <script>
         $(document).ready(function(){
            removeSection = function(e) {
               $(e).parents(".subject").remove();
            
               $('[data-spy="scroll"]').each(function () {
                  var $spy = $(this).scrollspy('refresh')
               });
            }
         
            $("#Navexample").scrollspy();
         
            // The event is fired when an item gets actived with the scrollspy
            $("#Navexample").on('activate.bs.scrollspy', function () {
               var currentSection = $(".nav li.active > a").text();
               $("#spyevent").html("Current Item being viewed >> " + currentSection);
            })
				
         });
      </script>
   
      <style>
         .scroll-box {
            height: 250px;
            position: relative;
            overflow: auto;
            font-size:2em;
         }
      </style>
   </head>
   
   <body>
      <div class = "container">
         <nav id = "Navexample" class = "navbar navbar-default" role = "navigation">
      
            <!-- Nav Bar -->
            <div class = "navbar-header">
               <button type = "button" class = "navbar-toggle" 
                  data-toggle = "collapse" data-target = "#navbarCollapse">
               
                  <span class = "sr-only">Toggle navigation</span>
                  <span class = "icon-bar"></span>
                  <span class = "icon-bar"></span>
                  <span class = "icon-bar"></span>
               </button>
					
               <a class = "navbar-brand" href = "#">Tutorials Point</a>
            </div>
            
            <!-- Links and Sublinks -->
            <div class = "collapse navbar-collapse" id = "navbarCollapse">
               <ul class = "nav navbar-nav">
                  <li class = "active"><a href = "#subject-1">Subject 1</a></li>
                  <li><a href = "#subject-2">Subject 2</a></li>
               
                  <li class = "dropdown"><a href = "#" class = "dropdown-toggle" 
                     data-toggle = "dropdown">Subject 3<b class = "caret"></b></a>
                     
                     <ul class = "dropdown-menu">
                        <li><a href = "#subject-3-1">Subject 3.1</a></li>
                        <li><a href = "#subject-3-2">Subject 3.2</a></li>
                        <li><a href = "#subject-3-3">Subject 3.3</a></li>
                     </ul>
                     
                  </li>
						
                  <li><a href = "#subject-4">Subject 4</a></li>
               </ul>
            </div>
            
         </nav>
         
         <div class = "scroll-box" data-spy = "scroll" data-offset = "0">
            <div class = "subject">
            
               <h3 id = "subject-1">Subject 1 
                  <small><a href = "#" onclick = "removeSubject(this);">Remove Subject ×</a></small>
               </h3>
            
               <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                  sed do eiusmod tempor incididunt ut labore et dolore magna
                  aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                  ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
				
            <hr>
         
            <div class = "subject">
               <h3 id = "subject-2">Subject 2 
                  <small><a href = "#" onclick = "removeSubject(this);">Remove Subject ×</a></small>
               </h3>
            
               <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                  sed do eiusmod tempor incididunt ut labore et dolore magna
                  aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                  ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
				
            <hr>
         
            <div class = "subject">
               <h3 id = "subject-3">Subject 3 
                  <small><a href = "#" onclick = "removeSubject(this);"> Remove Subject ×</a></small>
               </h3>
            
               <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                  sed do eiusmod tempor incididunt ut labore et dolore magna
                  aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                  ullamco laboris nisi ut aliquip ex ea commodo consequat.</p><
            </div>
				
            <hr>
            
            <div class = "subject">
               <h4 id = "subject-3-1">Subject 3.1
                  <small><a href = "#" onclick = "removeSubject(this);"> Remove Subject ×</a></small>
               </h4>
               
               <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                  sed do eiusmod tempor incididunt ut labore et dolore magna
                  aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                  ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
            
            <div class = "subject">
               <h4 id = "subject-3-2">Subject 3.2
                  <small><a href = "#" onclick = "removeSubject(this);"> Remove Subject ×</a></small>
               </h4>
               
               <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                  sed do eiusmod tempor incididunt ut labore et dolore magna
                  aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                  ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
            
            <div class = "subject">
               <h4 id = "subject-3-3">Subject 3.3 
                  <small><a href = "#" onclick = "removeSubject(this);">Remove Subject ×</a></small>
               </h4>
               
               <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                  sed do eiusmod tempor incididunt ut labore et dolore magna
                  aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                  ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
				
            <hr>
            
            <div class = "subject">
               <h3 id = "subject-4">Subject 4 
                  <small><a href = "#" onclick = "removeSubject(this);">Remove Subject ×</a></small>
               </h3>
               
               <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                  sed do eiusmod tempor incididunt ut labore et dolore magna
                  aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                  ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
            
         </div>
         <hr>
         
         <h4 id = "spyevent" class = "text-info"></h4>
      </div>
   </body>
</html>