40 lines
1.6 KiB
JavaScript
40 lines
1.6 KiB
JavaScript
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(function(){
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// Select the button
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const btnTheme = document.getElementById('theme');
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// Check for dark mode preference at the OS level
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const prefersDarkScheme = window.matchMedia('(prefers-color-scheme: dark)');
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// Get the user's theme preference from local storage, if it's available
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const currentTheme = localStorage.getItem('theme');
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// If the user's preference in localStorage is dark...
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if (currentTheme === 'dark') {
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// ...let's toggle the .dark-theme class on the body
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document.body.classList.toggle('dark-theme');
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// Otherwise, if the user's preference in localStorage is light...
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} else if (currentTheme === 'light') {
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// ...let's toggle the .light-theme class on the body
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document.body.classList.toggle('light-theme');
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}
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// Listen for a click on the button
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btnTheme.addEventListener('click', function(e) {
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e.preventDefault();
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// If the user's OS setting is dark and matches our .dark-theme class...
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let theme;
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if (prefersDarkScheme.matches) {
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// ...then toggle the light mode class
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document.body.classList.toggle('light-theme');
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// ...but use .dark-theme if the .light-theme class is already on the body,
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theme = document.body.classList.contains('light-theme') ? 'light' : 'dark';
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} else {
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// Otherwise, let's do the same thing, but for .dark-theme
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document.body.classList.toggle('dark-theme');
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theme = document.body.classList.contains('dark-theme') ? 'dark' : 'light';
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}
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// Finally, let's save the current preference to localStorage to keep using it
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localStorage.setItem('theme', theme);
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});
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})();
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