I have a side navigation bar with a button to toggle showing just the icons or to show the icons and the text. There are multiple different HTML pages that share this nav bar, so I needed to save the nav bar’s state for when you switch to each (Dashboard to Items, Contacts to Dashboard, etc). I do this using the follow code:
var navBar = document.querySelector(".side-bar");
var toggle = document.querySelector(".nav-toggle");
window.onload = () =>
{
let isClosed = localStorage.getItem("navState");
navBar.classList.toggle("nav-is-closed", isClosed);
}
toggle.addEventListener("click", () =>
{
let isClosed = navBar.classList.toggle("nav-is-closed");
localStorage.setItem("navState", isClosed);
});
.side-bar {
position: relative;
background-color: var(--default-back-color);
min-width: 200px;
}
.nav-is-closed {
min-width: inherit;
}
.nav-is-closed a h2 {
display: none;
}
<!DOCTYPE html>
<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">
<link rel="stylesheet" href="resources/css/styles.css">
<!--Google Fonts-->
<link rel="preconnect" href="https://fonts.gstatic.com">
<link href="https://fonts.googleapis.com/css2?family=Neucha&family=Poppins:wght@300&display=swap" rel="stylesheet">
<title>Rucksack</title>
</head>
<body>
<header>
<div>
<a href="#"><img src="resources/images/rucksack.png" alt=""></a>
<h1 class="title">Rucksack</h1>
</div>
<div>
<a class="smaller-icon" href="#"><img src="resources/images/gear.png" alt=""></a>
<a href="#"><img src="resources/images/blue-profile.png" alt=""></a>
</div>
</header>
<main>
<section id="main-section">
<nav class="side-bar">
<a class="selected-nav" href="dashboard"><img src="resources/images/house-icon.png" alt=""><h2>Dashboard</h2></a>
<a href="items"><img src="resources/images/item-icon.png" alt=""><h2>Items</h2></a>
<hr class="nav-break">
<a href="contacts"><img src="resources/images/contacts-icon.png" alt=""><h2>Contacts</h2></a>
<hr class="nav-break">
<a href="reports"><img src="resources/images/reports-icon.png" alt=""><h2>Reports</h2></a>
<div class="nav-toggle"><img src="resources/images/arrow-icon.png" alt=""></div>
</nav>
<div class="content">
<strong>Content</strong>
</div>
</section>
</main>
<script src="shell-controls.js"></script>
</body>
</html>
Everything works fine, except when you move to a new page while the nav is open. It closes even though in window.onload, isClosed is false. As far as I know, toggle with force set to false removes the class, but in this case it’s still adding it.
As Kaiido said, isClosed was being pulled from localStorage as a string, which caused toggleClass to think the string of "false" was truthy, therefore still adding the ‘nav-is-closed’ class. Adding JSON.parse when getting isClosed and adding JSON.stringify when setting isClosed in localStorage solves the problem.
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