Die Anleitung zu Bootstrap Scrollspy

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1- Bootstrap Scrollspy

Zuerst beobachten Sie ein folgendes  Scrollspy :
Scrollspy heißt nach seinem Name  Scroll + Spy (scrollen + auskundschaften). Scrollspy funktioniert nach 2 Elemente:
  1. Das erste Element ist ein Nav (oder List-Group).
  2. Das zweite Element ist ein scrollbare Inhaltsraum (scrollable), der <body> oder <div>,<span> sein kann.... Wenn die Inhalt kein <body> ist, soll sie height und overflow-y: scroll.

Der Operationsgrundsatz:

  1. In Komponent 1 klickt der Benutzer auf einem Item vom Nav (oder List-Group). Die Scroll-Leiste auf Komponent 2 wird funktionieren um die dem Item übereinstimmende richtige Inhalt, auf die der Benutzer klickt anzuzeigen.
  2. In Komponent 2 wenn der Benutzer die Scroll-Leiste zieht, wird Item vom Komponent 1, die der anzeigenden Inhalt, aktiv.
simple-scrollspy-example.html
<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <title>Bootstrap Scrollspy</title>
      <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
   </head>
   <body>
      <div class="container-fluid">
      <h3>Scrollspy on DIV</h3>
      <hr>

      <div class="row">
         <div class="col-4">
            <nav id="myScrollspy">
               <ul class="nav nav-pills flex-column">
                  <li class="nav-item"><a class="nav-link" href="#content-javascript">Javascript</a></li>
                  <li class="nav-item"><a class="nav-link" href="#content-css">CSS</a></li>
                  <li class="nav-item"><a class="nav-link" href="#content-bootstrap">Bootstrap</a></li>
               </ul>
            </nav>
         </div>
         <div class="col-8">
            <div data-spy="scroll" data-target="#myScrollspy" data-offset="10"
                  style="height:200px;overflow-y: scroll;padding:5px; border: 1px solid #ccc;">
               <h4 id="content-javascript">Javascript</h4>
               <p>
                 JavaScript is a cross-platform, object-oriented scripting language used to make webpages interactive
                  (e.x. having complex animations, clickable buttons, popup menus, etc.)...
               </p>
               <h4 id="content-css">CSS</h4>
               <p>
                 CSS is the language for describing the presentation of Web pages, including colors,
                  layout, and fonts. It allows one to adapt the presentation to different types of devices,
                  such as large screens, small screens, or printers...
               </p>
               <h4 id="content-bootstrap">Bootstrap</h4>
               <p>
                 CSS is the language for describing the presentation of Web pages, including colors,
                  layout, and fonts. It allows one to adapt the presentation to different types of devices,
                  such as large screens, small screens, or printers. CSS is independent of HTML
                  and can be used with any XML-based markup language...
               </p>
            </div>
         </div>
       </div>
       <hr>
        Other Contents ...
      </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>
Mehr sehen

2- Scrollspy + BODY

In diesem Beispiel werde ich ein  Scrollspy machen um die Inhalt auf   <body> auszukundschaften (spy). Achten Sie darauf, das Default  <body> die vertikale Scroll-Leiste (vertical scrollbar). Das ist die Leiste des Browser. Unter ist es die Illustrator der Struktur des Beispiel:
body-scrollspy-example.html
<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <title>Bootstrap Scrollspy</title>
      <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
   </head>
   <body data-spy="scroll" data-target="#scrollspy-nav" data-offset="110">
      <div class="container-fluid">

         <nav id="scrollspy-nav" class="navbar  bg-dark fixed-top">
            <ul class="nav nav-pills">
               <li class="nav-item"><a class="nav-link" href="#content-javascript">Javascript</a></li>
               <li class="nav-item"><a class="nav-link" href="#content-css">CSS</a></li>
               <li class="nav-item"><a class="nav-link" href="#content-bootstrap">Bootstrap</a></li>
            </ul>
         </nav>

         <div style="margin-top:100px;">
            <h4 id="content-javascript">Javascript</h4>
            <p>
               JavaScript is a cross-platform, object-oriented scripting language used to make webpages interactive
               (e.x. having complex animations, clickable buttons, popup menus, etc.)...
            </p>
            <h4 id="content-css">CSS</h4>
            <p>
               CSS is the language for describing the presentation of Web pages, including colors,
               layout, and fonts. It allows one to adapt the presentation to different types of devices,
               such as large screens, small screens, or printers...
            </p>
            <h4 id="content-bootstrap">Bootstrap</h4>
            <p>
               CSS is the language for describing the presentation of Web pages, including colors,
               layout, and fonts. It allows one to adapt the presentation to different types of devices,
               such as large screens, small screens, or printers. CSS is independent of HTML
               and can be used with any XML-based markup language...
            </p>
         </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>

3- Das Beispiel mit dem verschachtelten Nav (Nested Nav)

Scrollspy kann auch mit den verschachtelten  Nav (Nested Navs) arbeiten. Wenn ein  Nav aktiviert wird, wird Vater  Nav aktiviert.
nested-nav-scrollspy-example.html
<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <title>Bootstrap Scrollspy</title>
      <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
   </head>
   <body>
      <div class="container-fluid">
         <h3>Scrollspy with Nested Navs</h3>
         <hr>
         <div class="row">
            <div class="col-4">
               <nav id="myScrollspy">
                  <ul class="nav nav-pills flex-column">
                     <li class="nav-item">
                        <a class="nav-link" href="#content-frontend">
                        <strong>1- Frontend</strong>
                        </a>
                        <ul class="nav nav-pills flex-column">
                           <li class="nav-item">
                              <a class="nav-link" href="#content-javascript"> 1.1- Javascript</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="#content-css"> 1.2- CSS</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="#content-bootstrap"> 1.3- Bootstrap</a>
                           </li>
                        </ul>
                     </li>
                     <li class="nav-item">
                        <a class="nav-link" href="#content-backend">
                        <strong>2- Backend</strong>
                        </a>
                        <ul class="nav nav-pills flex-column">
                           <li class="nav-item">
                              <a class="nav-link" href="#content-java"> 2.1- Java</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="#content-csharp"> 2.2- C#</a>
                           </li>
                        </ul>
                     </li>
                  </ul>
               </nav>
            </div>
            <div class="col-8">
               <div data-spy="scroll" data-target="#myScrollspy" data-offset="10"
                  style="height:300px;overflow-y: scroll;padding:5px; border: 1px solid #ccc;">
                  <h2 id="content-frontend">1. Frontend</h2>
                  Javascript, CSS, Bootstrap
                  <h4 id="content-javascript">1.1. Javascript</h4>
                  <p>
                     JavaScript is a cross-platform, object-oriented scripting language
                     used to make webpages interactive
                     (e.x. having complex animations, clickable buttons, popup menus, etc.)...
                  </p>
                  <h4 id="content-css">1.2. CSS</h4>
                  <p>
                     CSS is the language for describing the presentation of Web pages,
                     including colors, layout, and fonts.
                     It allows one to adapt the presentation to different types of devices,
                     such as large screens, small screens, or printers...
                  </p>
                  <h4 id="content-bootstrap">1.3. Bootstrap</h4>
                  <p>
                     CSS is the language for describing the presentation of Web pages,
                     including colors, layout, and fonts.
                     It allows one to adapt the presentation to different types of devices,
                     such as large screens, small screens, or printers. CSS is independent of HTML
                     and can be used with any XML-based markup language...
                  </p>
                  <h2 id="content-backend">2. Backend</h2>
                  Java, C#
                  <h4 id="content-java">2.1. Java</h4>
                  <p>
                     Java is a programming language and computing platform first released by Sun Microsystems in 1995.
                     There are lots of applications and websites that will not work unless you have Java installed,
                     and more are created every day. Java is fast, secure, and reliable.
                  </p>
                  <h4 id="content-csharp">2.2. C#</h4>
                  <p>
                     C# is a general object-oriented programming (OOP) language for networking and Web development.
                     C# is specified as a common language infrastructure (CLI) ...
                  </p>
               </div>
            </div>
         </div>
         <hr>
         Other Contents ...
      </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>

4- Das Beispiel mit List Group

Scrollspy kann mit  List Group arbeiten. Das ist ein Beispiel unten:
list-group-scrollspy-example.html
<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <title>Bootstrap Scrollspy</title>
      <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
   </head>
   <body>
      <div class="container-fluid">
         <h3>Scrollspy with List Group</h3>
         <hr>
         <div class="row">
            <div class="col-4">
               <div class="list-group" id="myScrollspy">
                  <a class="list-group-item" href="#content-javascript">Javascript</a>
                  <a class="list-group-item" href="#content-css">CSS</a>
                  <a class="list-group-item" href="#content-bootstrap">Bootstrap</a>
               </div>
            </div>
            <div class="col-8">
               <div data-spy="scroll" data-target="#myScrollspy" data-offset="10"
                  style="height:200px;overflow-y: scroll;padding:5px; border: 1px solid #ccc;">
                  <h4 id="content-javascript">Javascript</h4>
                  <p>
                     JavaScript is a cross-platform, object-oriented scripting language used to make webpages interactive
                     (e.x. having complex animations, clickable buttons, popup menus, etc.)...
                  </p>
                  <h4 id="content-css">CSS</h4>
                  <p>
                     CSS is the language for describing the presentation of Web pages, including colors,
                     layout, and fonts. It allows one to adapt the presentation to different types of devices,
                     such as large screens, small screens, or printers...
                  </p>
                  <h4 id="content-bootstrap">Bootstrap</h4>
                  <p>
                     CSS is the language for describing the presentation of Web pages, including colors,
                     layout, and fonts. It allows one to adapt the presentation to different types of devices,
                     such as large screens, small screens, or printers. CSS is independent of HTML
                     and can be used with any XML-based markup language...
                  </p>
               </div>
            </div>
         </div>
         <hr>
         Other Contents ...
      </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- Javascript (TODO)

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