Created
November 20, 2022 23:08
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Astro ThemeSwitcher Component
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| --- | |
| import bi from "@iconify-json/bi/icons.json" | |
| import Icon from "@/components/Icon.astro" | |
| type ThemeType = "dark" | "light" | |
| const THEME_DARK: ThemeType = "dark" | |
| const THEME_LIGHT: ThemeType = "light" | |
| const STORAGE_KEY_THEME: string = "theme" | |
| let defaultTheme: ThemeType = THEME_DARK | |
| const icons = { | |
| dark: bi.icons["moon-fill"].body, | |
| light: bi.icons["sun-fill"].body | |
| } | |
| --- | |
| <button id="theme-switcher-btn" type="button" class="ml-2"> | |
| <Icon id="theme-switcher-icon" clazz="text-black hover:text-white" name="bi:moon-fill" size={20} /> | |
| </button> | |
| <script define:vars={{ icons, THEME_DARK, THEME_LIGHT, STORAGE_KEY_THEME, defaultTheme }} > | |
| const theme = (() => { | |
| if (typeof localStorage !== "undefined" && localStorage.getItem(STORAGE_KEY_THEME)) { | |
| return localStorage.getItem(STORAGE_KEY_THEME) | |
| } | |
| if (window.matchMedia("(prefers-color-scheme: dark)").matches) { | |
| return THEME_DARK | |
| } | |
| return THEME_LIGHT | |
| })() | |
| if (theme === THEME_DARK) { | |
| document.documentElement.classList.add(THEME_DARK) | |
| } else { | |
| document.documentElement.classList.remove(THEME_DARK) | |
| } | |
| window.localStorage.setItem(STORAGE_KEY_THEME, theme || defaultTheme) | |
| const switchTheme = () => { | |
| const element = document.documentElement | |
| element.classList.toggle(THEME_DARK) | |
| const isDark = element.classList.contains(THEME_DARK) | |
| localStorage.setItem(STORAGE_KEY_THEME, isDark ? THEME_DARK : THEME_LIGHT) | |
| const themeSwitcherIcon = document.getElementById("theme-switcher-icon") | |
| if (isDark) { | |
| themeSwitcherIcon.classList.remove("bi:sun-fill") | |
| themeSwitcherIcon.classList.add("bi:moon-fill") | |
| themeSwitcherIcon.innerHTML = icons.dark | |
| } else { | |
| themeSwitcherIcon.classList.add("bi:sun-fill") | |
| themeSwitcherIcon.classList.remove("bi:moon-fill") | |
| themeSwitcherIcon.innerHTML = icons.light | |
| } | |
| } | |
| document.getElementById("theme-switcher-btn")?.addEventListener("click", switchTheme) | |
| </script> |
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