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Duskmoon UI component library for Phoenix LiveView
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Files
assets/js/hooks/theme_switcher.js
/**
* ThemeSwitcher Hook
* Handles theme switching with localStorage persistence.
* Works with @duskmoon-dev/core's theme-controller-dropdown CSS component.
*
* Sets data-theme on document.documentElement so CSS attribute selectors
* like [data-theme="sunshine"] activate the correct theme.
*/
const darkQuery = window.matchMedia("(prefers-color-scheme: dark)");
function resolveAutoTheme() {
return darkQuery.matches ? "moonlight" : "sunshine";
}
function applyTheme(theme) {
const resolved = (!theme || theme === "default") ? resolveAutoTheme() : theme;
document.documentElement.setAttribute("data-theme", resolved);
}
export const ThemeSwitcher = {
mounted() {
const serverTheme = this.el.dataset.theme || "";
let theme = serverTheme || localStorage.getItem("theme") || "default";
// Apply theme to document root so CSS selectors activate
applyTheme(theme);
const themeInputs = this.el.querySelectorAll(".theme-controller-item");
// Set initial checked state from localStorage or server
themeInputs.forEach(input => {
input.checked = theme === input.value;
});
// Re-apply when OS color scheme changes (only matters in auto mode)
this._mediaListener = () => {
const current = localStorage.getItem("theme") || "default";
if (current === "default") applyTheme("default");
};
darkQuery.addEventListener("change", this._mediaListener);
// Handle theme changes — store references for cleanup
this._changeListeners = [];
themeInputs.forEach(input => {
const listener = (event) => {
theme = event.target.value;
requestAnimationFrame(() => {
applyTheme(theme);
localStorage.setItem("theme", theme);
this.pushEvent("theme_changed", { theme: theme });
// Close the <details> dropdown after selection
this.el.removeAttribute("open");
});
};
input.addEventListener("change", listener);
this._changeListeners.push({ element: input, listener });
});
},
updated() {
// Sync with server state if changed
const serverTheme = this.el.dataset.theme;
if (serverTheme) {
applyTheme(serverTheme);
const themeInputs = this.el.querySelectorAll(".theme-controller-item");
themeInputs.forEach(input => {
input.checked = serverTheme === input.value;
});
}
},
destroyed() {
if (this._changeListeners) {
this._changeListeners.forEach(({ element, listener }) => {
element.removeEventListener("change", listener);
});
this._changeListeners = null;
}
if (this._mediaListener) {
darkQuery.removeEventListener("change", this._mediaListener);
this._mediaListener = null;
}
}
};