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48 lines
1.9 KiB
JavaScript
48 lines
1.9 KiB
JavaScript
// Check user prefers color, toggle light/dark, save state
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// Based loosely on https://github.com/vinorodrigues/bootstrap-dark
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function apply_color_scheme(theme) {
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const disable_theme = (theme == "dark") ? "light" : "dark";
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document.documentElement.classList.add(theme)
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document.documentElement.classList.remove(disable_theme)
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document.documentElement.setAttribute("data-theme", theme)
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// $("#css-toggle-btn").prop( "checked", (theme == 'dark') );
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}
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function auto_update_theme() {
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const upc = window.localStorage.getItem('user-prefers-color')
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let theme = "dark"; // Default to dark theme
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if (!upc) {
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// User hasn't saved a preference specifically for this site; check
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// the browser-level preferences.
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if (window.matchMedia &&
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window.matchMedia("(prefers-color-scheme: light)").matches) {
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theme = "light"
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}
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} else { // Follow user's saved setting.
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theme = (upc == "light") ? "light" : "dark"
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}
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apply_color_scheme(theme)
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}
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function user_toggle_theme() {
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const new_theme = document.documentElement.classList.contains("dark") ? "light" : "dark"
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window.localStorage.setItem("user-prefers-color", new_theme)
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// Animate this style switch, but not the ones that happen on page load:
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document.body.style.transition = "background-color .2s ease"
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apply_color_scheme(new_theme)
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}
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auto_update_theme()
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// update automatically if the user's theme preference changes
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if (window.matchMedia) {
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window.matchMedia("(prefers-color-scheme: dark)").addListener( auto_update_theme )
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}
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// Note: .addListener is considered deprecated, and is supposed to be updated to
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// addEventListener("change", callback) instead; however, as recently as macOS
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// High Sierra (~2017-2018) Safari does not support addEventListener here.
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window.addEventListener('DOMContentLoaded', (event) => {
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document.getElementById("css-toggle-btn").onclick = user_toggle_theme
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})
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