在滚动时缩小和更改背景导航栏

Question

我试图让我的导航栏在我滚动时立即缩小并更改背景颜色。 我尝试了类似问题中提供的一些 javascript 解决方案，但似乎没有用。 这是我的 html 的样子：

 <nav id="menu" class="navbar navbar-default navbar-fixed-top"> <div class="container"> <!-- Brand and toggle get grouped for better mobile display --> <div class="navbar-header"> <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1"> <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="index.html"><i class="fa fa-cog fa-spin fa-1x fa-fw margin-bottom" aria-hidden="true"></i> PROTOTYPE<font color="#37c6f5">MY</font>SKETCH<strong></strong></a> </div> <!-- Collect the nav links, forms, and other content for toggling --> <div class="collapse navbar-collapse"> <ul class="nav navbar-nav navbar-right"> <li class="dropdown"> <a href="#" class="dropdown-toggle">Contact</a> <ul class="dropdown-menu"> </ul> </li> </ul> <ul class="nav navbar-nav navbar-right"> <li class="dropdown"> <a href="#" class="dropdown-toggle">Services</a> <ul class="dropdown-menu"> </ul> </li> </ul> <ul class="nav navbar-nav navbar-right"> <li class="dropdown"> <a href="about.html" class="dropdown-toggle">About</a> </li> </ul> <ul class="nav navbar-nav navbar-right"> <li class="dropdown"> <a href="#" class="dropdown-toggle">Home</a> <ul class="dropdown-menu"> </ul> </li> </ul> </div> <!-- /.navbar-collapse --> </div> <!-- /.container-fluid --> </nav>

任何帮助真的很感激！

Answer 1

Using Jquery and Css you can change the background color of navbar with scrolling:

 $(document).ready(function(){
  $(window).scroll(function() { 
    if ($(document).scrollTop() > 150) { 
      $('.navbar').addClass('shrink'); 
    } else { 
      $('.navbar').removeClass('shrink'); 
    } 
  }); 
 });

CSS for that:
.navbar{
   transition: background-color 0.5s ease;
   background-color: #f8f8f8;
}
.navbar.shrink{ 
   background: #dddddd 
}

change color as per your requirement.