NickG-Math.github.io/switch.js at main · NickG-Math/NickG-Math.github.io · GitHub

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 // function to set a given theme/color-scheme
        function setTheme(themeName) {
            localStorage.setItem('theme', themeName);
            document.documentElement.className = themeName;
        }

        // function to toggle between light and dark theme
        function toggleTheme() {
            if (localStorage.getItem('theme') === 'theme-dark') {
                setTheme('theme-light');
            } else {
                setTheme('theme-dark');
            }
        }

        // Immediately invoked function to set the theme on initial load
        (function () {
            if (localStorage.getItem('theme') === 'theme-dark') {
                setTheme('theme-dark');
                document.getElementById('slider').checked = false;
            } else {
                setTheme('theme-light');
              document.getElementById('slider').checked = true;
            }
        })();