Bootstrap Affix

The Attach plugin allows you to affix (lock) an element to a specific region on the page. This is frequently used with navigation menus or social icon buttons to keep them "sticking" in one place while scrolling up and down the page.
Depending on the scroll position, the plugin toggles this behaviour on and off (changing the value of CSS position from static to fixed).
Examples
On Navbar
Html:
<nav class="navbar navbar-defalt" data-offset-top="120" data-spy="affix" >
...
</nav>
CSS:
<style>
.navbar {
background-color: red;
}
.navbar.affix {
background-color: green;
}
</style>
Affix Example 2:
<div class="container" id="con">
<div class="row">
<div class="span12">
<div class="well">
<h1> Header </h1>
</div>
</div>
</div>
</div>
<div class="container" data-spy="affix" data-offset-top="400" id="nav">
<div class="navbar">
<div class="navbar-inner">
<div class="container">
<div class="span12">
<a class="brand" href="#">Home</a>
<ul class="nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>
</ul>
</div>
</div>
</div>
</div>
</div>
<div class="container">
<div class="span3">
<p style="height:1000px;padding:10px;">
Long scrolling text here... Ovi lispmd idr. Blah goo bar foor foo. Ovi lispmd
idr. Blah goo bar foor foo. Ovi lispmd idr. Blah goo bar foor foo. Ovi lispmd idr. Blah goo
bar foor foo. Ovi lispmd idr. Blah goo bar foor foo. Ovi lispmd idr. Blah goo bar foor foo.
Ovi lispmd idr. Blah goo bar foor foo. Ovi lispmd idr. Blah goo bar foor foo. Ovi lispmd idr.
Blah goo bar foor foo. Ovi lispmd idr. Blah goo bar foor foo.
</p>
</div>
</div>
<style>
#con .well {
height: 400px;
}
#nav.affix {
position: fixed;
top: 0;
width: 100%
}
</style>
<script>
$('#nav').affix();
</script>
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