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58 lines (55 loc) · 2.36 KB
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<body style="background:#fff; margin:0; padding:0; ">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<style>
#nav {height:40px;}
#nav li {float:left; display:inline-block;}
.active{
color: red;
background-color: red;
}
</style>
<div id="nav" style="position: fixed; top:0; left:0; width:100%;background:#000;">
<ul style="margin:0; padding:0; list-style:none;">
<li class="active"><a href="#red" style="color:#fff; ">red</a> </li>
<li><a href="#green" style="color:#fff; ">green</a> </li>
<li><a href="#yellow" style="color:#fff; ">yellow</a> </li>
<li><a href="#blue" style="color:#fff; ">blue</a> </li>
<li><a href="#pink" style="color:#fff; ">pink</a> </li>
<li><a href="#black" style="color:#fff; ">Black</a></li>
<div style="clear:both; margin:0; padding:0;"></div>
</ul>
</div>
<div id="red" class="scrollspy" style="background:#000; height:100%; ">
<div style="background:red; height:100%; ">red</div>
</div>
<div id="green" class="scrollspy" style="background:#000; height:100%; ">
<div style="background:green; height:100%; ">green</div>
</div>
<div id="yellow" class="scrollspy" style="background:#000; height:100%; ">
<div style="background:yellow; height:100%; ">yellow</div>
</div>
<div id="blue" class="scrollspy" style="background:#000; height:100%; ">
<div style="background:blue; height:100%; ">blue</div>
</div>
<div id="pink" class="scrollspy" style="background:#000; height:100%; ">
<div style="background:pink; height:100%; ">pink</div>
</div>
<div id="black" class="scrollspy" style="background:#000; height:100%; ">
<div style="background:#000; height:100%; ">Black</div>
</div>
<script>
$(window).bind('scroll', function() {
var currentTop = $(window).scrollTop();
var elems = $('.scrollspy');
elems.each(function(index){
var elemTop = $(this).offset().top;
var elemBottom = elemTop + $(this).height();
if(currentTop >= elemTop && currentTop <= elemBottom){
var id = $(this).attr('id');
var navElem = $('a[href="#' + id+ '"]');
navElem.parent().addClass('active').siblings().removeClass( 'active' );
}
})
});
</script>
</body>