javascript - Logo at the top of navigation bar hide when scroll down -


i'm using bootstrap v3.3.4 make navigation header...here dom navigation bar:

<nav class="navbar navbar-default navbar-fixed-top">   <div class="container-fluid">       <img id="header-logo" src="/assets/img/dashboard/pencil_demo.png">       <hr id="header-nav">     <div class="navbar-header">       <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">         <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="/">home</a>     </div>     <div id="navbar" class="navbar-collapse collapse">       <ul class="nav navbar-nav">         <li class="dropdown">           <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">profile <span class="caret"></span></a>           <ul class="dropdown-menu" role="menu">             <li><a href="/profile/">my profile</a></li>             <li><a href="/billing/">my billing</a></li>             <li><a href="/badges/">my badges</a></li>           </ul>         </li>                       <li class="dropdown">             <a href="/friends/" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">friends <span class="caret"></span></a>             <ul class="dropdown-menu" role="menu">                 <li><a href="/friends/">my friends</a></li>                 <li><a href="/friends/browse/">search friends</a></li>                                     <li><a href="#" onclick="sendrequestviamultifriendselector();">invite friends</a></li>             </ul>         </li>         <li><a href="/ask/">ask question</a></li>         <li><a href="/review/">my revision</a></li>       </ul>       <ul class="nav navbar-nav navbar-right">           <li><a href=""><span class="circle-image-user" style="margin-top:-6px;"></span></a></li>           <li><a href=""><span class="circle-image-school" style="margin-top:-6px;"></span></a></li>           <li><a href="/dashboard/">dashboard</a></li>           <li><a href="/logout/">logout</a></li>       </ul>     </div><!--/.nav-collapse -->   </div> </nav>

my current output: enter image description here

how can hide pencil-company logo when scroll down? let navbar when scroll down: enter image description here

when go @ top...i want keep logo @ top of navigation bar...

sample of company logo:

enter image description here

$(function() {      $(window).scroll(function() {      var x = $(window).scrolltop();        if (x >= 42) {        $("#header-logo").hide();      } else {        $("#header-logo").show();      }      });    });
#header-logo {    height: 100px;  }  body {    height: 5000px;  }
<html>    <head>    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet" />  </head>    <body>    <nav class="navbar navbar-default navbar-fixed-top">      <div class="container-fluid">        <img id="header-logo" src="http://farm4.static.flickr.com/3254/3322981237_7e723b609e.jpg">        <hr id="header-nav">        <div class="navbar-header">          <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">            <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="/">home</a>        </div>        <div id="navbar" class="navbar-collapse collapse">          <ul class="nav navbar-nav">            <li class="dropdown">              <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">profile <span class="caret"></span></a>              <ul class="dropdown-menu" role="menu">                <li><a href="/profile/">my profile</a>                </li>                <li><a href="/billing/">my billing</a>                </li>                <li><a href="/badges/">my badges</a>                </li>              </ul>            </li>            <li class="dropdown">              <a href="/friends/" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">friends <span class="caret"></span></a>              <ul class="dropdown-menu" role="menu">                <li><a href="/friends/">my friends</a>                </li>                <li><a href="/friends/browse/">search friends</a>                </li>                <li><a href="#" onclick="sendrequestviamultifriendselector();">invite friends</a>                </li>              </ul>            </li>            <li><a href="/ask/">ask question</a>            </li>            <li><a href="/review/">my revision</a>            </li>          </ul>          <ul class="nav navbar-nav navbar-right">            <li><a href=""><span class="circle-image-user" style="margin-top:-6px;"></span></a>            </li>            <li><a href=""><span class="circle-image-school" style="margin-top:-6px;"></span></a>            </li>            <li><a href="/dashboard/">dashboard</a>            </li>            <li><a href="/logout/">logout</a>            </li>          </ul>        </div>        <!--/.nav-collapse -->      </div>    </nav>    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>  </body>    </html>


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