The key to implementing dark mode switching of web pages lies in HTML structure, CSS style separation, JavaScript control class names and persistent storage. First, add button elements: <button id="darkModeToggle">Switch dark mode</button>; second, define the body default style and .dark-mode class style in CSS; then, use JavaScript to listen to the button click event and switch the class name: document.body.classList.toggle('dark-mode'); then, use localStorage to save user preferences, read the status when the page is loaded and restore the corresponding mode; finally, you can automatically detect system preferences and prioritize user storage settings. Through these steps, you can achieve a complete dark mode switching function.
The dark mode switching function is now almost standard for web pages, and it is actually not complicated to implement. You can do it by using CSS with a little HTML and JavaScript. The key is to understand how to control topic switching and persist user preferences.
Basic structure: HTML style separation
Start with the structure. The core is to add a switch button to the page and define different styles for the two states "light" and "dark". Put a button in HTML:
<button id="darkModeToggle">Switch dark mode</button>
Then use class names in CSS to distinguish light and dark styles, such as changing the background and text color when adding .dark-mode class to body :
body {
background-color: #fff;
color: #333;
}
body.dark-mode {
background-color: #121212;
color: #e6e6e6;
}In this way, as long as you switch the class name through JS, you can achieve the basic switching effect.
Switch logic: Use JavaScript to control class names
The next step is to make the button really move. The task of JavaScript is very simple: listen for click events and switch the class name on the body.
document.getElementById('darkModeToggle').addEventListener('click', function () {
document.body.classList.toggle('dark-mode');
}); This code means that every time you click a button, you add or remove the dark-mode class on the body. Combined with the CSS written above, visual switching is achieved.
Remember user selection: Use localStorage to save status
The user has clicked on dark mode, and the refresh has changed back? This requires saving users' preferences. You can use localStorage provided by the browser to remember the current status.
Change the JS part:
const toggleButton = document.getElementById('darkModeToggle');
// Check the storage status when the page is loading if (localStorage.getItem('darkMode') === 'enabled') {
document.body.classList.add('dark-mode');
}
toggleButton.addEventListener('click', function () {
document.body.classList.toggle('dark-mode');
// If there is currently a dark-mode class, the status is saved if (document.body.classList.contains('dark-mode')) {
localStorage.setItem('darkMode', 'enabled');
} else {
localStorage.setItem('darkMode', 'disabled');
}
});This way, even if the page is refreshed, the user's preferences can be restored according to the local storage.
Optional optimization: Automatic detection of system preferences
If you want to follow the system settings by default, you can add a paragraph to judge:
if (
window.matchMedia &&
window.matchMedia('(prefers-color-scheme: dark)').matches
) {
document.body.classList.add('dark-mode');
}However, it should be noted that if the user has manually set preferences (localStorage exists), the user's choice should be used first, rather than the system default.
Basically that's it. The entire process is clear and the implementation is simple, but the state synchronization and storage mechanism must be handled in details. You can further encapsulate or use a framework to implement it according to your project's needs.
The above is the detailed content of How to create a dark mode toggle with CSS. For more information, please follow other related articles on the PHP Chinese website!
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