我有帶有下拉子選單的導航欄選單。每當單擊選單時，子選單就會展開，但是當單擊子選單時，子選單會回傳折疊狀態。如何使選單及其子選單保持展開狀態，直到單擊另一個選單？
上圖，當點擊個人資料選單下的圖片子選單時，它會打開一個頁面并且個人資料選單保持展開狀態，直到點擊其他選單（例如訊息選單）然后個人資料選單被折疊。
my fiddle
請指教。
uj5u.com熱心網友回復：
在您的代碼中，您將系結到一個 css :target，當單擊任何其他鏈接時該目標是 RESET 。這個問題是否解決了，我不知道。但此類任務通常使用 javaScript 完成
const links = document.querySelectorAll('.menu-btn');
let activeNav = null;
links.forEach(item => {
item.addEventListener('click', e => {
e.preventDefault();
const wrapper = item.closest('.item');
if (!wrapper) {
return;
}
/** 1. START - each menu item is separate*/
// wrapper.classList.toggle('open');
/** 1. END - each menu item is separate*/
/** 2. START - only one active (need variable - activeNav) */
if (activeNav === wrapper) {
/** If you want the active to be always, remove this code */
wrapper.classList.remove('open')
activeNav = null;
} else {
if (activeNav) {
activeNav.classList.remove('open');
}
wrapper.classList.add('open');
activeNav = wrapper;
}
/** 2. START - only one active */
})
})@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@100;200;300;400;500;600;700;800;900&display=swap');
* {
margin: 0;
padding: 0;
list-style: none;
text-decoration: none;
box-sizing: border-box;
font-family: 'Poppins', sans-serif;
}
body {
width: 100%;
background: #e5e7eb;
position: relative;
}
.wrapper .header {
z-index: 1;
background: #22242A;
position: fixed;
/*aslinya width: calc(100%-0%)*/
width: calc(100%);
height: 70px;
display: flex;
top: 0;
}
.wrapper .header .header-menu {
width: calc(100%-0%);
height: 100%;
display: flex;
justify-content: space-between;
align-items: center;
padding: 0 20px;
}
.wrapper .header .header-menu .title {
color: #fff;
font-size: 25px;
text-transform: uppercase;
font-weight: 900;
}
.wrapper .header .header-menu .title span {
color: #4ccee8;
}
.wrapper .header .header-menu .sidebar-btn {
color: #fff;
position: absolute;
margin-left: 240px;
font-size: 22px;
font-weight: 900;
cursor: pointer;
transition: 0.3s;
transition-property: color;
}
.wrapper .header .header-menu .sidebar-btn:hover {
color: #4ccee8;
}
.wrapper .header .header-menu ul {
display: flex;
}
/*tombol sebelah my panel*/
.wrapper .header .header-menu ul li a {
background: #fff;
color: #000;
display: block;
margin: 0 10px;
font-size: 18px;
width: 34px;
height: 34px;
line-height: 35px;
text-align: center;
border-radius: 50%;
transition: 0.3s;
transition-property: background, color;
}
.wrapper .header .header-menu ul li a:hover {
background: #4ccee8;
color: #fff;
}
.wrapper .sidebar {
z-index: 1;
background: #2f323a;
position: fixed;
top: 70px;
width: 250px;
/*begron abu2. aslinya: height: calc(100%-9%);*/
height: calc(100%);
transition: 0.3s;
transition-property: width;
overflow-y: auto;
}
.wrapper .sidebar .sidebar-menu {
overflow: hidden;
}
.wrapper .sidebar .sidebar-menu .profile img {
margin: 20px 0;
width: 100px;
height: 100px;
border-radius: 50%;
}
.wrapper .sidebar .sidebar-menu .profile p {
color: #bbb;
font-weight: 700;
margin-bottom: 10px;
}
.wrapper .sidebar .sidebar-menu .item {
width: 250px;
overflow: hidden;
}
.wrapper .sidebar .sidebar-menu .item .menu-btn {
display: block;
color: #fff;
position: relative;
padding: 25px 20px;
transition: 0.3s;
transition-property: color;
}
.wrapper .sidebar .sidebar-menu .item .menu-btn:hover {
color: #4ccee8;
}
.wrapper .sidebar .sidebar-menu .item .menu-btn i {
margin-right: 20px;
}
.wrapper .sidebar .sidebar-menu .item .menu-btn .drop-down {
float: right;
font-size: 12px;
margin-top: 3px;
}
.wrapper .sidebar .sidebar-menu .item .sub-menu {
background: #3498d8;
overflow: hidden;
max-height: 0;
transition: 0.3s;
transition-property: background, max-height;
}
.wrapper .sidebar .sidebar-menu .item .sub-menu a {
display: block;
position: relative;
color: #fff;
white-space: nowrap;
font-size: 15px;
padding: 20px;
border-bottom: 1px solid #8fc5e9;
transition: 0.3s;
transition-property: background;
}
.wrapper .sidebar .sidebar-menu .item .sub-menu a:hover {
background: #55b1f0;
}
.wrapper .sidebar .sidebar-menu .item .sub-menu i {
padding: right 20px;
font-size: 10px;
}
.wrapper .sidebar .sidebar-menu .item.open .sub-menu {
max-height: 500px;
}
.wrapper .sidebar .sidebar-menu .item:target .sub-menu {
/* max-height: 500px; */
}
.wrapper .main-container {
width: (100%-250px);
margin-top: 70px;
margin-left: 250px;
padding: 15px;
background: url("images/background.jpg")no-repeat;
height: 100vh;
transition: 0.3s;
}<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Apanel</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="wrapper">
<div class="header">
<div class="header-menu">
<div class="title">This <span>is</span></div>
<div class="sidebar-btn">
<i class="fas fa-bars"></i>
</div>
<ul>
<li><a href="#"><i class="fas fa-search"></i></a></li>
<li><a href="#"><i class="fas fa-bell"></i></a></li>
<li><a href="#"><i class="fas fa-power-off"></i></a></li>
</ul>
</div>
</div>
<div class="sidebar">
<div class="sidebar-menu">
<li class="item">
<a href="#" class="menu-btn">
<i class="fas fa-desktop"></i><span>Dashboard</span>
</a>
</li>
<li class="item" id="profile">
<a href="#profile" class="menu-btn">
<i class="fa fa-user-circle"></i><span>Profile <i class="fas fa-chevron-down drop-down"></i>
</span>
</a>
<div class="sub-menu">
<a href="#"><i class="fas fa-image"></i><span>Picture</span></a>
<a href="#"><i class="fas fa-address-card"></i><span>Info</span></a>
</div>
</li>
<li class="item" id="messages">
<a href="#messages" class="menu-btn">
<i class="fa fa-envelope"></i><span> Messages<i class="fas fa-chevron-down drop-down"></i>
</span>
</a>
<div class="sub-menu">
<a href="#"><i class="fas fa-envelope"></i><span>New</span></a>
<a href="#"><i class="fas fa-envelope-square"></i><span>Sent</span></a>
<a href="#"><i class="fas fa-exclamation-circle"></i><span>Spam</span></a>
</div>
</li>
<li class="item" id="settings">
<a href="#settings" class="menu-btn">
<i class="fa fa-cog"></i><span>Settings<i class="fas fa-chevron-down drop-down"></i>
</span>
</a>
<div class="sub-menu">
<a href="#"><i class="fas fa-lock"></i><span>Password</span></a>
<a href="#"><i class="fas fa-language"></i><span>Language</span></a>
<a href="#"><i class="fas fa-exclamation-circle"></i><span>Spam</span></a>
</div>
</li>
<li class="item">
<a href="#" class="menu-btn">
<i class="fas fa-info-circle"></i><span>About</span>
</a>
</li>
</div>
</div>
<div class="main-container">
<a href="#">link</a>
</div>
</div>
</body>
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