Created
May 31, 2024 14:13
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CSS light/dark mode with manual toggle
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| <!doctype html> | |
| <html lang="en" data-theme="light"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>dark mode</title> | |
| <link rel="stylesheet" href="style.css" /> | |
| <script src="script.js" defer></script> | |
| </head> | |
| <body> | |
| <label class="theme-switch" for="cb"> | |
| <input type="checkbox" id="cb" /> Toggle Mode | |
| </label> | |
| </body> | |
| </html> |
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| /* manual toggle */ | |
| const toggleSwitch = document.querySelector('.theme-switch input'); | |
| toggleSwitch.addEventListener('change', function (e) { | |
| if (e.target.checked) { | |
| document.documentElement.setAttribute('data-theme', 'dark'); | |
| localStorage.setItem('theme', 'dark'); | |
| } else { | |
| document.documentElement.setAttribute('data-theme', 'light'); | |
| localStorage.setItem('theme', 'light'); | |
| } | |
| }, false); | |
| /* read localstorage on load */ | |
| const currentTheme = localStorage.getItem('theme') ? localStorage.getItem('theme') : null; | |
| if (currentTheme) { // localstorage setting exists | |
| document.documentElement.setAttribute('data-theme', currentTheme); | |
| if (currentTheme === 'dark') { | |
| toggleSwitch.checked = true; | |
| } | |
| } else { // localstorage setting missing, read OS setting | |
| if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) { | |
| document.documentElement.setAttribute('data-theme', 'dark'); | |
| toggleSwitch.checked = true; | |
| } | |
| } | |
| // react to OS setting change, if no localstorage setting exists | |
| window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', function (event) { | |
| if (currentTheme) return; | |
| const newColorScheme = event.matches ? 'dark' : 'light'; | |
| document.documentElement.setAttribute('data-theme', newColorScheme); | |
| if (newColorScheme === 'dark') { | |
| toggleSwitch.checked = true; | |
| } else { | |
| toggleSwitch.checked = false; | |
| } | |
| }); |
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| /* | |
| @media (prefers-color-scheme: light) { | |
| :root { | |
| } | |
| } | |
| @media (prefers-color-scheme: dark) { | |
| :root { | |
| --test: #333; | |
| } | |
| } | |
| */ | |
| :root { | |
| color-scheme: light dark; | |
| --test: #fff; | |
| } | |
| [data-theme="dark"] { | |
| --test: #333; | |
| } | |
| html { | |
| background: var(--test); | |
| } |
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builds on my previous effort:
https://gist.github.com/oelna/2428a4c468ac96681173f029a38fd723