javascript - Bootstrap Scroll Spy not working.Shows only the home state active but doesnt change to other states when scrolled down -

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this html , css.please me scrollspy dont know problem .if possible let me know code have written solve problem

my html: 

<nav class="navbar navbar-default center navbar-fixed-top" id="navbar">    <button class="navbar-toggler hidden-sm-up"type="button" data-toggle="collapse" data-target="#excollapsingnavbar2">&#9776;</button>  <div class="collapse navbar-toggleable-xs" id="excollapsingnavbar2">    <a class="navbar-brand" href="#"></a>      <div class="navbar-inner">        <ul class="nav navbar-nav">          <li class="nav-item active">             <a class="nav-link" data-target="#jumbotron">home <span class="sr-only">(current)</span></a>         </li>          <li class="nav-item">             <a class="nav-link" data-target="#about">about</a>         </li>          <li class="nav-item">             <a class="nav-link" data-target="#skills">skills</a>         </li>          <li class="nav-item">             <a class="nav-link" href="#contact">contact</a>         </li>        </ul>      </div>  </div>  </nav>  <div class=" jumbotron" id="jumbotron"></div> <div id="about"></div> <div id="skills"></div> <div id="contact"></div>

my css

and divs of 750px in heights 

  body   {      background: none;     position: relative;     margin: 0;     padding: 0;     font-family: 'droid serif', georgia, times, serif;    }   /* --------------------------------------------navbar css--------------------------------------------------- */    .navbar-default    {     background-color: #610b0b ;     border-radius:0px;    }   .navbar-default .navbar-nav > li >    {     color: white;     font-size: 15px;      font-family: 'droid serif', georgia, times, serif;     letter-spacing: 1px;     margin: 3px 10px -3px 10px;     border: 2px solid transparent;     padding: 8px;    }    .navbar-default .navbar-nav > li > a:hover,   .navbar-default .navbar-nav > li > a:focus   {      border: 2px solid white;     border-radius: 5px;     color: white;     padding: 8px;   }    .navbar-default .navbar-nav > .active > a,    .navbar-default .navbar-nav > .active > a:hover,    .navbar-default .navbar-nav > .active > a:focus    {     border: 2px solid white;     border-radius: 5px;     color: #555;     background-color: #e7e7e7;   }

there couple of things wrong.

first, 3 of nav-link anchors have data-target= when should have href=

second, need set data-target= <body> of navbar. allows javascript find target scrollspy:

<body data-target="#navbar">

and third, if haven't, need call scrollspy via javascript:

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

here codepen working example:

http://codepen.io/charliebeckstrand/pen/nrwpxp


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