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Dark Mode w/ JS
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| <html data-theme="light"> | |
| <head> | |
| <title>Dark Mode w/ JS</title> | |
| <style> | |
| [data-theme="light"] { | |
| --color-bg: #e5e5e5; | |
| --color-fg: #0f0f0f; | |
| } | |
| [data-theme="dark"] { | |
| --color-bg: #0f0f0f; | |
| --color-fg: #e5e5e5; | |
| } | |
| * { | |
| font-family: monospace; | |
| } | |
| body { | |
| background-color: var(--color-bg); | |
| color: var(--color-fg); | |
| display: grid; | |
| min-height: 100vh; | |
| place-items: center; | |
| } | |
| button { | |
| font-size: 2rem; | |
| font-weight: bold; | |
| padding: 0.5rem 1rem; | |
| transition: all var(--global-transition-time) ease-in-out; | |
| border-radius: 2rem; | |
| cursor: pointer; | |
| color: var(--color-fg); | |
| background-color: var(--color-bg); | |
| border: 0.25rem solid var(--color-fg); | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <button type="button" data-theme-toggle aria-label="Change to light theme"> | |
| Change to light theme | |
| </button> | |
| <script> | |
| function calculateSettingAsThemeString({ | |
| localStorageTheme, | |
| systemSettingDark, | |
| }) { | |
| if (localStorageTheme !== null) { | |
| return localStorageTheme; | |
| } | |
| if (systemSettingDark.matches) { | |
| return "dark"; | |
| } | |
| return "light"; | |
| } | |
| function updateButton({ buttonEl, isDark }) { | |
| const newCta = isDark | |
| ? "Change to light theme" | |
| : "Change to dark theme"; | |
| buttonEl.setAttribute("aria-label", newCta); | |
| buttonEl.innerText = newCta; | |
| } | |
| function updateThemeOnHtmlEl({ theme }) { | |
| document.querySelector("html").setAttribute("data-theme", theme); | |
| } | |
| const button = document.querySelector("[data-theme-toggle]"); | |
| const localStorageTheme = localStorage.getItem("theme"); | |
| const systemSettingDark = window.matchMedia( | |
| "(prefers-color-scheme: dark)" | |
| ); | |
| let currentThemeSetting = calculateSettingAsThemeString({ | |
| localStorageTheme, | |
| systemSettingDark, | |
| }); | |
| updateButton({ | |
| buttonEl: button, | |
| isDark: currentThemeSetting === "dark", | |
| }); | |
| updateThemeOnHtmlEl({ theme: currentThemeSetting }); | |
| button.addEventListener("click", (event) => { | |
| const newTheme = currentThemeSetting === "dark" ? "light" : "dark"; | |
| localStorage.setItem("theme", newTheme); | |
| updateButton({ buttonEl: button, isDark: newTheme === "dark" }); | |
| updateThemeOnHtmlEl({ theme: newTheme }); | |
| currentThemeSetting = newTheme; | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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