72 lines
1.9 KiB
JavaScript
72 lines
1.9 KiB
JavaScript
document.addEventListener('DOMContentLoaded', function() {
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changeTheme();
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initcolorTheme();
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});
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function changeTheme() {
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let toggleBtn = document.querySelector('#theme-toggle-js');
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if(toggleBtn) {
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toggleBtn.addEventListener('click', function() {
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if(toggleBtn.dataset.theme === 'light') {
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setTheme('dark', true);
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} else {
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setTheme('light', true);
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}
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});
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}
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}
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/***
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* init javascript
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* 1) detect native color scheme or use set theme in local storage
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* 2) detect view (desktop or responsive) if on mobile device with touch screen
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* 3) set base font size to 112.5% -> 18px
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*/
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function initcolorTheme() {
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colorThemeWatcher();
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let theme = localStorage.getItem('theme');
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if (theme == null || theme === 'auto') {
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if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) {
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setTheme('dark', false);
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} else {
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setTheme('light', false);
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}
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} else {
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setTheme(theme)
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}
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}
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/***
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* Listener operating system native color configuration
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*/
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function colorThemeWatcher() {
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try {
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window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', e => {
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setTheme(e.matches ? 'dark' : 'light');
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});
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} catch {
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console.warn('color theme watcher not supported');
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}
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}
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/**
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* Define color scheme, colors without losing the base font size configuration
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* and add data-theme to html tag
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* @param theme
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*/
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function setTheme(theme, setLocalStorage = true) {
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let toggleBtn = document.querySelector('#theme-toggle-js');
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if (setLocalStorage) {
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localStorage.setItem('theme', theme);
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}
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if (toggleBtn) toggleBtn.setAttribute('data-theme', theme);
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if (document.documentElement.dataset.theme === 'dark' && theme === 'light') {
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document.documentElement.dataset.theme = 'light';
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} else if(document.documentElement.dataset.theme === 'light' && theme === 'dark'){
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document.documentElement.dataset.theme = 'dark';
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}
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}
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