51 lines
1.6 KiB
JavaScript
51 lines
1.6 KiB
JavaScript
'use strict';
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{
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function setTheme(mode) {
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if (mode !== "light" && mode !== "dark" && mode !== "auto") {
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console.error(`Got invalid theme mode: ${mode}. Resetting to auto.`);
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mode = "auto";
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}
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document.documentElement.dataset.theme = mode;
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localStorage.setItem("theme", mode);
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}
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function cycleTheme() {
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const currentTheme = localStorage.getItem("theme") || "auto";
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const prefersDark = window.matchMedia("(prefers-color-scheme: dark)").matches;
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if (prefersDark) {
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// Auto (dark) -> Light -> Dark
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if (currentTheme === "auto") {
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setTheme("light");
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} else if (currentTheme === "light") {
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setTheme("dark");
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} else {
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setTheme("auto");
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}
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} else {
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// Auto (light) -> Dark -> Light
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if (currentTheme === "auto") {
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setTheme("dark");
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} else if (currentTheme === "dark") {
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setTheme("light");
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} else {
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setTheme("auto");
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}
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}
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}
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function initTheme() {
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// set theme defined in localStorage if there is one, or fallback to auto mode
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const currentTheme = localStorage.getItem("theme");
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currentTheme ? setTheme(currentTheme) : setTheme("auto");
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}
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window.addEventListener('load', function(_) {
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const buttons = document.getElementsByClassName("theme-toggle");
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Array.from(buttons).forEach((btn) => {
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btn.addEventListener("click", cycleTheme);
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});
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});
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initTheme();
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}
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