JavaScript中的响应式导航菜单

Question

I am trying to build a responsive navigation menu for my website. 我正在尝试为我的网站构建一个响应式导航菜单。 However, it should also stick to the top when you scroll further down the page. 但是，当您向下滚动页面时，它也应该停留在顶部。 This works fine on the normal 'desktop-size' menu, but when I expand the list items in the responsive navigation menu, the whole menu re-positions itself back to the top. 这在普通的“桌面大小”菜单上可以正常工作，但是当我在响应式导航菜单中展开列表项时，整个菜单会重新定位到顶部。

let navbar = document.querySelector("nav");
let offset = navbar.offsetTop;

// Makes the menu sticky
function stick() {
    if (window.pageYOffset >= offset) {
        navbar.classList.add("sticky")
    } else {
        navbar.classList.remove("sticky");
    }
}

// Makes the menu responsive
function collapse() {
    if (navbar.className === "responsive") {
        navbar.classList.remove("responsive");
    } else {
        navbar.classList.add("responsive")
    }
}

My JSFiddle: https://jsfiddle.net/MihkelPajunen/t37g6hsc/ 我的JSFiddle： https ：//jsfiddle.net/MihkelPajunen/t37g6hsc/

Question: Is there a way to make the responsive navigation menu sticky, so that the menu is accessible at the top of the page, even when you scroll further down the page? 问题：有没有办法使响应式导航菜单保持粘性，以便即使在页面上向下滚动时也可以在页面顶部访问该菜单？

Answer 1

Remove the following rule: 删除以下规则：

nav.responsive {
    position: relative;
}

As this is overriding the position: fixed rule. 因为这是最重要的position: fixed规则。

Also, change the collapse function like so: 此外，按以下方式更改折叠功能：

if (navbar.className.indexOf("responsive") >=0 ) {

As the class name will actually be something like "responsive sticky" 由于类名实际上将类似于“响应式粘滞”

Here's a fork of that fiddle 这是那把小提琴的叉子

Answer 2

Try To use this one instead of yours 尝试使用这个而不是你的

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<style>
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.topnav {
  overflow: hidden;
  background-color: #333;
}

.topnav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

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

.active {
  background-color: #4CAF50;
  color: white;
}

.topnav .icon {
  display: none;
}

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child) {display: none;}
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 600px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
}
</style>
</head>
<body>

<div class="topnav" id="myTopnav">
  <a href="#home" class="active">Home</a>
  <a href="#news">News</a>
  <a href="#contact">Contact</a>
  <a href="#about">About</a>
  <a href="javascript:void(0);" class="icon" onclick="myFunction()">
    <i class="fa fa-bars"></i>
  </a>
</div>

<div style="padding-left:16px">
  <h2>Responsive Topnav Example</h2>
  <p>Resize the browser window to see how it works.</p>
</div>

<script>
function myFunction() {
    var x = document.getElementById("myTopnav");
    if (x.className === "topnav") {
        x.className += " responsive";
    } else {
        x.className = "topnav";
    }
}
</script>

</body>
</html>

JavaScript中的响应式导航菜单

问题描述

2 个解决方案

解决方案1
0 已采纳 2018-05-20 19:02:15

解决方案2
0 2018-05-20 19:31:58

JavaScript中的响应式导航菜单

问题描述

2 个解决方案

解决方案1 0 已采纳 2018-05-20 19:02:15

解决方案2 0 2018-05-20 19:31:58

解决方案1
0 已采纳 2018-05-20 19:02:15

解决方案2
0 2018-05-20 19:31:58