jquery - stick navigation to top when scrolled to/past - Bootstrap 3 -


i trying create navigation sticks top of site when hits top of page. (the navigation 280px top when user @ top of page)i using bootstrap 3 framework in wordpress.

this common thing , have found number of examples can't seem work me.

i have generic bootstrap navigation. trying put following code in no success.

html ( in < head > tags )

<script>   $('#nav').affix({   offset: {     top: $('header').height()   }   });    </script> 

html

<body <?php body_class(); ?> >  <header class="masthead">  <div class="container">    <div class="row">      <div class="col-sm-6">        <h1><a href="#" title="scroll down viewing pleasure">bootstrap 3 layout template</a><p class="lead">big top header , fixed sidebar</p></h1>      </div>      <div class="col-sm-6">      </div>    </div>  </div> </header>              <!-- begin navbar --> <div id="nav">   <div class="navbar navbar-default navbar-static">     <div class="container">       <!-- .btn-navbar used toggle collapsed navbar content -->        <a class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">         <span class="glyphicon glyphicon-bar"></span>         <span class="glyphicon glyphicon-bar"></span>         <span class="glyphicon glyphicon-bar"></span>       </a>       <div class="navbar-collapse collapse">         <ul class="nav navbar-nav">           <li class="active"><a href="#">home</a></li>           <li class="divider"></li>           <li><a href="#">link</a></li>           <li><a href="#">link</a></li>         </ul>       </div>            </div>   </div><!-- /.navbar --> </div> </div> 

css

header {   height:280px; }  #nav.affix {   position: fixed;   top: 0;   width: 100%;   z-index:10; } 


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