如何操作 - 折叠侧边栏

了解如何创建可折叠的侧边栏菜单。

单击按钮打开可折叠侧边栏：

创建折叠侧边栏

步骤1）添加HTML：

示例

<div id="mySidebar" class="sidebar">
<a href="javascript:void(0)" class="closebtn" onclick="closeNav()">×</a>
<a href="#">About</a>
<a href="#">Services</a>
<a href="#">Clients</a>
<a href="#">Contact</a>
</div>

<div id="main">
<button class="openbtn" onclick="openNav()">☰ Open Sidebar</button>
<h2>Collapsed Sidebar</h2>
<p>Content...</p>
</div>

步骤2）添加CSS：

示例

/* The sidebar menu */
.sidebar {
  height: 100%; /* 100% Full-height */
  width: 0; /* 0 width - change this with JavaScript */
  position: fixed; /* Stay in place */
  z-index: 1; /* Stay on top */
top: 0;
left: 0;
  background-color: #111; /* Black*/
  overflow-x: hidden; /* Disable horizontal scroll */
padding-top: 60px; /* Place content 60px from the top */
transition: 0.5s; /* 0.5 second transition effect to slide in the sidebar */
}

/* The sidebar links */
.sidebar a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #818181;
display: block;
  transition: 0.3s;
}

/* When you mouse over the navigation links, change their color */
.sidebar a:hover {
  color: #f1f1f1;
}

/* Position and style the close button (top right corner) */
.sidebar .closebtn {
  position: absolute;
top: 0;
right: 25px;
font-size: 36px;
margin-left: 50px;
}

/* The button used to open the sidebar */
.openbtn {
  font-size: 20px;
cursor: pointer;
background-color: #111;
color: white;
  padding: 10px 15px;
  border: none;
}

.openbtn:hover {
  background-color: #444;
}

/* Style page content - use this if you want to push the page content to the right when you open the side navigation */
#main {
transition: margin-left .5s; /* If you want a transition effect */
padding: 20px;
}

/* On smaller screens, where height is less than 450px, change the style of the sidenav (less padding and a smaller font size) */
@media screen and (max-height: 450px) {
  .sidebar {padding-top: 15px;}
.sidebar a {font-size: 18px;}
}

步骤 3) 添加 JavaScript：

示例

/* Set the width of the sidebar to 250px and the left margin of the page content to 250px */
function openNav() {
  document.getElementById("mySidebar").style.width = "250px";
  document.getElementById("main").style.marginLeft = "250px";
}

/* Set the width of the sidebar to 0 and the left margin of the page content to 0 */
function closeNav() {
document.getElementById("mySidebar").style.width = "0";
  document.getElementById("main").style.marginLeft = "0";
}

亲自试一试 »

提示：去我们的CSS 导航栏教程了解有关导航栏的更多信息。