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79 lines
No EOL
2 KiB
JavaScript
79 lines
No EOL
2 KiB
JavaScript
/*!
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* Minimal theme switcher using a checkbox
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*
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* Pico.css - https://picocss.com
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* Copyright 2019-2025 - Licensed under MIT
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* Modified by Yohn https://github.com/Yohn/PicoCSS
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*/
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const SwitchColorMode = {
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// Config
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_scheme: "auto",
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toggleSelector: "input[name='color-mode-toggle']",
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rootAttribute: "data-theme",
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localStorageKey: "picoPreferredColorScheme",
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// Init
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init() {
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this.checkbox = document.querySelector(this.toggleSelector);
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if (!this.checkbox) {
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console.error("Theme switcher toggle not found");
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return;
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}
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// If first visit, use the theme from <html> attribute; otherwise, use stored preference
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this.scheme = this.schemeFromLocalStorage ?? this.schemeFromHTML;
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// Set checkbox state based on the applied theme
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this.checkbox.checked = this.scheme === "dark";
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// Listen for user changes
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this.checkbox.addEventListener("change", () => {
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this.scheme = this.checkbox.checked ? "dark" : "light";
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this.schemeToLocalStorage();
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});
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},
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// Get color scheme from local storage
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get schemeFromLocalStorage() {
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return window.localStorage?.getItem(this.localStorageKey);
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},
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// Get the default theme from the <html> attribute
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get schemeFromHTML() {
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return document.documentElement.getAttribute(this.rootAttribute) ?? "auto";
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},
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// Preferred color scheme from system
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get preferredColorScheme() {
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return window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
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},
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// Set scheme
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set scheme(scheme) {
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if (scheme === "auto") {
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this._scheme = this.preferredColorScheme;
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} else if (scheme === "dark" || scheme === "light") {
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this._scheme = scheme;
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}
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this.applyScheme();
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},
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// Get scheme
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get scheme() {
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return this._scheme;
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},
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// Apply scheme
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applyScheme() {
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document.documentElement.setAttribute(this.rootAttribute, this._scheme);
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},
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// Store scheme to local storage
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schemeToLocalStorage() {
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window.localStorage?.setItem(this.localStorageKey, this.scheme);
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},
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};
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// Init
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SwitchColorMode.init(); |