89 lines
2.7 KiB
JavaScript
89 lines
2.7 KiB
JavaScript
// Light/dark/auto theme toggle, adapted from Bootstrap's docs
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// (https://getbootstrap.com/docs/5.3/customize/color-modes/).
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// Sets data-bs-theme on <html> before first paint, then wires up the
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// dropdown in the theme-toggle button once the DOM is ready.
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(() => {
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"use strict";
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const getStoredTheme = () => localStorage.getItem("theme");
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const setStoredTheme = (theme) => localStorage.setItem("theme", theme);
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const getPreferredTheme = () => {
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const storedTheme = getStoredTheme();
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if (storedTheme) {
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return storedTheme;
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}
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return window.matchMedia("(prefers-color-scheme: dark)").matches
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? "dark"
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: "light";
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};
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const setTheme = (theme) => {
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if (theme === "auto") {
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document.documentElement.setAttribute(
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"data-bs-theme",
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window.matchMedia("(prefers-color-scheme: dark)").matches
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? "dark"
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: "light",
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);
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} else {
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document.documentElement.setAttribute("data-bs-theme", theme);
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}
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};
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setTheme(getPreferredTheme());
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const showActiveTheme = (theme, focus = false) => {
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const themeSwitcher = document.querySelector("#bd-theme");
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if (!themeSwitcher) {
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return;
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}
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const themeSwitcherText = document.querySelector("#bd-theme-text");
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const activeThemeIcon = document.querySelector(".theme-icon-active use");
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const btnToActive = document.querySelector(
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`[data-bs-theme-value="${theme}"]`,
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);
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const svgOfActiveBtn = btnToActive
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.querySelector("svg use")
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.getAttribute("href");
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document.querySelectorAll("[data-bs-theme-value]").forEach((element) => {
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element.classList.remove("active");
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element.setAttribute("aria-pressed", "false");
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});
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btnToActive.classList.add("active");
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btnToActive.setAttribute("aria-pressed", "true");
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activeThemeIcon.setAttribute("href", svgOfActiveBtn);
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const themeSwitcherLabel = `${themeSwitcherText.textContent} (${btnToActive.dataset.bsThemeValue})`;
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themeSwitcher.setAttribute("aria-label", themeSwitcherLabel);
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if (focus) {
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themeSwitcher.focus();
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}
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};
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window
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.matchMedia("(prefers-color-scheme: dark)")
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.addEventListener("change", () => {
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const storedTheme = getStoredTheme();
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if (storedTheme !== "light" && storedTheme !== "dark") {
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setTheme(getPreferredTheme());
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}
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});
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window.addEventListener("DOMContentLoaded", () => {
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showActiveTheme(getPreferredTheme());
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document.querySelectorAll("[data-bs-theme-value]").forEach((toggle) => {
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toggle.addEventListener("click", () => {
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const theme = toggle.getAttribute("data-bs-theme-value");
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setStoredTheme(theme);
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setTheme(theme);
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showActiveTheme(theme, true);
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});
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});
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});
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})();
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