在滚动时缩小和更改背景导航栏 [英] Shrink and change background navbar on scroll

问题描述

我试图在滚动时立即缩小导航栏并更改背景颜色.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="容器"><!-- 品牌和切换被分组以获得更好的移动显示--><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">切换导航</span><span class="icon-bar"></span><span class="icon-bar"></span><span class="icon-bar"></span><a class="navbar-brand" href="index.html"><i class="fa fa-cog fa-spin fa-1x fa-fw margin-bottom" aria-hidden="true">;</i>原型<font color="#37c6f5">我的</font>草图<strong></strong></a>

<!-- 收集导航链接、表单和其他用于切换的内容--><div class="collapse navbar-collapse"><ul class="nav navbar-nav navbar-right">

<a href="#" class="dropdown-toggle">联系方式</a><ul class="下拉菜单">

<ul class="nav navbar-nav navbar-right">

<a href="#" class="dropdown-toggle">服务</a><ul class="下拉菜单">

<ul class="nav navbar-nav navbar-right">

<a href="about.html" class="dropdown-toggle">关于</a>

<ul class="nav navbar-nav navbar-right">

<a href="#" class="dropdown-toggle">首页</a><ul class="下拉菜单">

<!--/.navbar-collapse -->

<!--/.container-fluid --></nav>

非常感谢任何帮助！

解决方案

使用 Jquery 和 Css，您可以通过滚动更改导航栏的背景颜色:$(document).ready(function(){$(窗口).滚动(功能(){如果 ($(document).scrollTop() > 150) {$('.navbar').addClass('shrink');} 别的 {$('.navbar').removeClass('shrink');}});});CSS:.导航栏{过渡:背景色 0.5s 缓和；背景色:#f8f8f8；}.navbar.shrink{背景:#dddddd}根据您的要求更改颜色.

I am attempting to make my navbar shrink and change background color as soon as I scroll. I attempted some of the javascript solutions provided in a similar question but it did not seem to work. Here is what my html looks like:

<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>

Any help is truly appreciated!

解决方案

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.

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