jquery - Navbar become transparent and fixed to top when scroll down -


i want nav bar site.

http://bootstraplovers.com/templates/assan-v2.3/main-template/index.html

when i'm scrolling, nav bar of template becomes transparent , becomes fixed top. want nav bar same. i'm new html , css , bootstrap. can give me ideas how or clues?

this nav bar:

screen shot of navbar

.navbar-header{  	  height: 74px;  	}  	  	.navbar-toggle{  	  position: relative;  	  top: 15px;  	}  	.navbar-default .navbar-nav > li > {  	 font-weight: 590;  	 color: #949494;  	 display: block;  	 padding: 5px 35px 2px 45px;  	 border-bottom: 3px solid transparent;  	 line-height: 70px;  	 text-decoration: none;  	 transition: border-bottom-color 0.5s ease-in-out;  	 -webkit-transition: border-bottom-color 0.5s ease-in-out;   	 }  	 .nav.navbar-nav > li > a:hover, .nav.navbar-nav > li.active a{  		color:#a92419;  		border-bottom-color: #a92419;  	  }  	  .navbar-default .navbar-nav>.active>a, .navbar-default .navbar-nav>.active>a:focus, .navbar-default .navbar-nav>.active>a:hover {  		color: #a92419;  		background-color: white;  	}  	 .navbar-default{  	 background-color:#fff;  	 margin: 0;  	  	 }  	 .nav>li>a {  	 position: relative;  	 }  	.navbar-default .navbar-right > li > {  	padding: 0 30px;  	margin-right:6px;  	 }  	 .nav.navbar-nav > li{  	 display: :inline-block;  	 }  	 .nav.navbar-nav{  	 list-style-type:none;  	 }  	 .nav.navbar-nav > li > a:hover{  		color:#a92419;  	   border-bottom-color: #a92419;  	  }  	  .navbar-default .navbar-toggle .icon-bar {  	  background-color:#a92419;  	  margin:0 0 4px;  	  width: 25px;  	  height: 5px;  	  margin-right: 13px;  	  }  	  .navbar-default .navbar-toggle:focus, .navbar-default .navbar-toggle:hover{  	  background: none;  	  }  	  button.navbar-toggle{  	  background:none;  	  border:none;  	  color:#000;   	  margin: 0px;  	}  	.dropdown:hover .dropdown-menu {  	  display: block;  	}  	  	.dropdown-menu>li>a:hover {  		color:#a92419;  	}  	.dropdown-menu>li>a {  		display: block;  		padding: 3px 20px;  		clear: both;  		font-weight: 400;  		line-height: 3em;  		color: #333;  		white-space: nowrap;  	}  	.dropdown:hover a.dropdown-toggle {  	  border-bottom-color: #a92419;  	  color:#a92419;  	}  	.top-bar-dark {  	  background-color: #a92419;  	}  	  	.top-bar-light {  	  background-color: #f3f3f3;  	}  	.top-bar-light .top-dark-right li {  	  border-color: #ddd;  	}  	  	.top-bar-light .top-dark-right li a:hover {  	  color: #32c5d2;  	}  	.top-bar-socials {  	  line-height: 30px;  	  padding-top: 5px;  	}  	.top-bar-socials:after {  	  display: table;  	  clear: both;  	  content: "";  	}  	.top-bar-socials {  	  margin: 0px 8px;  	  text-decoration: none;  	  font-size:18px;  	  color: #fff;  	}  	  	.top-dark-right {  	  margin: 0px;  	  padding: 0px;  	}  	  	.top-dark-right li {  	  line-height: 40px;  	  border-left: 1px solid #932015;  	  padding: 0px 10px;  	  	}  	  	.top-dark-right li, .top-dark-right li {  	  color: #d7d7d7;  	  font-size: 12px;  	}  	  	.top-dark-right li {  	  margin-right: 5px;  	}  	  	.top-dark-right li a:hover {  	  color: #fff;  	}  	a.login{  	  text-decoration: none;  	}  	.fa-facebook:hover{  	  color:#3b5998;  	}  	.fa-twitter:hover{  	  color:#1dcaff;  	}  	.fa-linkedin:hover{  	  color:#007bb5;  	}
<link href="https://opensource.keycdn.com/fontawesome/4.6.3/font-awesome.min.css" rel="stylesheet"/>  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet"/>  <div class="top-bar-dark">    <div class="container">  	<div class="row">  	  <div class="col-sm-4 col-xs-7">  		<div class="top-bar-socials">  		  <a href="https://www.facebook.com/pages/governor-andres-pascual-collegenavotas-city/344134628983014?fref=ts">  			<i class="fa fa-facebook"></i>  		  </a>  		  <a href="https://twitter.com/official_gapc">  			<i class="fa fa-twitter"></i>  		  </a>  		  <a href="https://www.linkedin.com/company/governor-andres-pascual-college-in-navotas-city">  			<i class="fa fa-linkedin"></i>  		  </a>  		</div>  	  </div>  	  <div class="col-sm-8 col-xs-5 text-right">  		<ul class="list-inline top-dark-right">  		  <li class="hidden-sm hidden-xs"><i class="fa fa-envelope"></i> gapc_school@yahoo.com.ph</li>  		  <li class="hidden-sm hidden-xs"><i class="fa fa-phone"></i> (02) 282-9036</li>  		  <li><a href="#" class="login"><i class="fa fa-lock"></i> login</a>  		  </li>  		</ul>  	  </div>  	</div>    </div>  </div>  <nav class="navbar navbar-default navbar-static-top">    <div class="container">  	<div class="navbar-header">  	  <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#nav-collapse">  		<span class="icon-bar"></span>  		<span class="icon-bar"></span>  		<span class="icon-bar"></span>   	  </button>  	  <img class="img-responsive" src="images/brandz.png">    	</div>    	<div class="collapse navbar-collapse" id="nav-collapse">  	  <ul class="nav navbar-nav navbar-right">  		<li class="active"><a href="#">home</a>  		</li>  		<li class="dropdown">  		  <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">about us</a>  		  <ul class="dropdown-menu">  			<li><a href="#">history</a>  			</li>  			<li><a href="#">mission , vision</a>  			</li>  		  </ul>  		  <li><a href="#">admissions</a>  		  </li>  		  <li><a href="#">contact us</a>  		  </li>  		  <li><a href="#">faculty portal</a>  		  </li>  	  </ul>  	</div>    </div>  </nav>

you can using bootstrap's inbuild tool affix adding data-spy navbar this:

<nav class="navbar navbar-default navbar-static-top" data-spy="affix" data-offset-top="150">

and add css:

.navbar.affix {     position: fixed;     top:0;     width:100%;     background-color: rgba(255,255,255,0.5); <-- replace color want }

p.s. replace 150 height of top-bar-black div.


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