如何 - 隐藏滚动菜单

了解如何使用 CSS 和 JavaScript 隐藏向下滚动的导航菜单。

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如何在向下滚动时隐藏导航栏

步骤1）添加HTML：

创建导航栏：

示例

<div id="navbar">
<a href="#home">Home</a>
<a href="#news">News</a>
<a href="#contact">Contact</a>
</div>

步骤2）添加CSS：

导航栏样式：

示例

#navbar {
  background-color: #333; /* Black background color */
  position: fixed; /* Make it stick/fixed */
top: 0; /* Stay on top */
  width: 100%; /* Full width */
  transition: top 0.3s; /* Transition effect when sliding down (and up) */
}

/* Style the navbar links */
#navbar a {
float: left;
display: block;
color: white;
text-align: center;
padding: 15px;
text-decoration: none;
}

#navbar a:hover {
  background-color: #ddd;
color: black;
}

步骤 3) 添加 JavaScript：

示例

/* When the user scrolls down, hide the navbar. When the user scrolls up, show the navbar */
var prevScrollpos = window.pageYOffset;
window.onscroll = function() {
var currentScrollPos = window.pageYOffset;
if (prevScrollpos > currentScrollPos) {
document.getElementById("navbar").style.top = "0";
} else {
document.getElementById("navbar").style.top = "-50px";
}
prevScrollpos = currentScrollPos;
}

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