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bootstrap-监听滚动实现头部跟随滚动

2016-09-08 00:04 295 查看
实现案例

<body  data-spy="scroll" data-target="#bs-example-navbar-collapse-1">
<div id='menu_wrap'>
<div class='menu'>
<nav class="navbar navbar-default" role="navigation">
<div class="container">
<div class="navbar-header">
<a class="navbar-brand" href="#"  style="font-weight:bold">植被数据录入</a>
</div>
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<!-- <button type="button" class="close" data-dismiss="modal" data-target="#mychart2-zb"><span aria-hidden="true">×</span></button> -->
<button type="button" class="btn btn-primary" style="float: right;margin-right: 10px;margin-top: 5px;" data-dismiss="modal" data-target="#mychart2-zb"><span aria-hidden="true">保存</span></button>
<button type="button" class="btn btn-primary" style="float: right;margin-right: 10px;margin-top: 5px;" data-dismiss="modal" data-target="#mychart2-zb"><span aria-hidden="true">取消</span></button>
</div>
</div>
</nav>
</div>
</div>
</body>


css控制样式

.menu{
width:100%;
z-index:99;
}
.menuFixed{
position:fixed;
top:0;
left:0;
}
#menu_wrap{
height:50px;
width:100%;
}


js监听

<script>
$(window).scroll(function () {
var menu_top = $('#menu_wrap').offset().top;
if ($(window).scrollTop() >= menu_top) {
$('.menu').addClass('menuFixed')
}
else {
$('.menu').removeClass('menuFixed')
}
});
</script>


导入js

<script type="text/javascript" src="../bower_components/jquery/dist/jquery.min.js"></script>
<script type="text/javascript" src="../bower_components/bootstrap/dist/js/bootstrap.min.js"></script>
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