[英]Responsive navigation menu in JavaScript
我正在嘗試為我的網站構建一個響應式導航菜單。 但是,當您向下滾動頁面時,它也應該停留在頂部。 這在普通的“桌面大小”菜單上可以正常工作,但是當我在響應式導航菜單中展開列表項時,整個菜單會重新定位到頂部。
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")
}
}
我的JSFiddle: https ://jsfiddle.net/MihkelPajunen/t37g6hsc/
問題:有沒有辦法使響應式導航菜單保持粘性,以便即使在頁面上向下滾動時也可以在頁面頂部訪問該菜單?
刪除以下規則:
nav.responsive {
position: relative;
}
因為這是最重要的position: fixed
規則。
此外,按以下方式更改折疊功能:
if (navbar.className.indexOf("responsive") >=0 ) {
由於類名實際上將類似於“響應式粘滯”
嘗試使用這個而不是你的
<!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>
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