website/_src/assets/js/theme.js

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JavaScript
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const basePath = "/assets/css";
const themeToggle = document.getElementById("theme-toggle");
const themeStylesheet = document.getElementById("custom");
const themes = [
{ name: "system", file: "default/system.css" },
{ name: "citrus", file: "citrus/citrus.css" },
];
let currentTheme = localStorage.getItem("theme") || themes[0].name;
setTheme(currentTheme);
function setTheme(themeName) {
const theme = themes.find(t => t.name === themeName);
if (theme) {
themeStylesheet.href = `${basePath}/${theme.file}`;
}
}
themeToggle.addEventListener("click", () => {
currentTheme = themes[(themes.findIndex(t => t.name === currentTheme) + 1) % themes.length].name;
setTheme(currentTheme);
localStorage.setItem("theme", currentTheme);
});