[TASK] add color switch option btn

frontend/main.ts

@@ -8,6 +8,8 @@ export interface choiceMap {
 let choiceObjects: choiceMap = {};
 
 document.addEventListener('DOMContentLoaded', function() {
+  changeTheme();
+  initcolorTheme();
   initSearch();
   initSidebar();
   initToggle();
@@ -20,6 +22,75 @@ document.addEventListener('DOMContentLoaded', function() {
   setCurrentdate(<HTMLInputElement>document.querySelector('#departure'));
 });
 
+function changeTheme() {
+  let toggleBtn = <HTMLElement>document.querySelector('#theme-toggle-js');
+
+  if(toggleBtn) {
+    toggleBtn.addEventListener('click', function() {
+      if(toggleBtn.dataset.theme === 'light') {
+        setTheme('dark', true);
+      } else {
+        setTheme('light', true);
+      }
+    });
+  } 
+}
+
+/***
+* init javascript
+* 1) detect native color scheme or use set theme in local storage
+* 2) detect view (desktop or responsive) if on mobile device with touch screen
+* 3) set base font size to 112.5% -> 18px
+*/
+function initcolorTheme() {
+  colorThemeWatcher();
+  let theme = localStorage.getItem('theme');
+  if (theme == null || theme === 'auto') {
+      if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) {
+          setTheme('dark', false);
+      } else {
+          setTheme('light', false);
+      }
+  } else {
+      setTheme(theme)
+  }
+}
+
+/***
+* Listener operating system native color configuration
+*/
+function colorThemeWatcher() {
+  try {
+      window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', e => {
+          setTheme(e.matches ? 'dark' : 'light');
+      });
+  } catch {
+      console.warn('color theme watcher not supported');
+  }
+}
+
+/**
+* Define color scheme, colors without losing the base font size configuration
+* and add data-theme to html tag
+* @param theme
+*/
+function setTheme(theme: string, setLocalStorage = true) {
+  let toggleBtn = document.querySelector('#theme-toggle-js');
+
+  if(toggleBtn) {
+    if (setLocalStorage) {
+      localStorage.setItem('theme', theme);
+    }
+    toggleBtn.setAttribute('data-theme', theme);
+
+    if (document.documentElement.classList.contains('dark') && theme === 'light') {
+        document.documentElement.classList.remove('dark');
+    } else if(theme === 'dark'){
+        document.documentElement.classList.add('dark');
+    }
+  }
+}
+
 function setCurrentdate(input: HTMLInputElement) {
   if(input) {
           const now = new Date();

frontend/tailwind.config.cjs

@@ -41,5 +41,6 @@ export default {
   },
   plugins: [],
   important: true,
+  darkMode: 'class',
 }
 

templates/includes/footer.html.tera

@@ -1,12 +1,23 @@
 <footer class="bg-primary-950 dark:bg-primary-900 text-white w-full flex justify-center p-3">
-	<div class="max-w-screen-xl w-full flex justify-between">
+	<div class="max-w-screen-xl w-full flex justify-between items-center">
 		<div>
 			<span class="text-[#ff0000]">&hearts;</span>
-			ASKÖ Ruderverein Donau Linz
+			ASKÖ Ruderverein Donau Linz <small class="text-primary-100">&copy; {{ now() | date(format="%Y") }}</smalL>
-		</div>
-		<div>
-			&copy;
-			{{ now() | date(format="%Y") }}
 		</div>
+
+    <div>
+      <button id="theme-toggle-js" type="button" data-theme="light" class="btn btn-primary">
+        <span class="hidden dark:inline">
+          <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" viewBox="0 0 16 16">
+            <path d="M8 11a3 3 0 1 1 0-6 3 3 0 0 1 0 6zm0 1a4 4 0 1 0 0-8 4 4 0 0 0 0 8zM8 0a.5.5 0 0 1 .5.5v2a.5.5 0 0 1-1 0v-2A.5.5 0 0 1 8 0zm0 13a.5.5 0 0 1 .5.5v2a.5.5 0 0 1-1 0v-2A.5.5 0 0 1 8 13zm8-5a.5.5 0 0 1-.5.5h-2a.5.5 0 0 1 0-1h2a.5.5 0 0 1 .5.5zM3 8a.5.5 0 0 1-.5.5h-2a.5.5 0 0 1 0-1h2A.5.5 0 0 1 3 8zm10.657-5.657a.5.5 0 0 1 0 .707l-1.414 1.415a.5.5 0 1 1-.707-.708l1.414-1.414a.5.5 0 0 1 .707 0zm-9.193 9.193a.5.5 0 0 1 0 .707L3.05 13.657a.5.5 0 0 1-.707-.707l1.414-1.414a.5.5 0 0 1 .707 0zm9.193 2.121a.5.5 0 0 1-.707 0l-1.414-1.414a.5.5 0 0 1 .707-.707l1.414 1.414a.5.5 0 0 1 0 .707zM4.464 4.465a.5.5 0 0 1-.707 0L2.343 3.05a.5.5 0 1 1 .707-.707l1.414 1.414a.5.5 0 0 1 0 .708z"/>
+          </svg>
+        </span>
+        <span class="inline dark:hidden">
+          <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" viewBox="0 0 16 16">
+            <path d="M6 .278a.768.768 0 0 1 .08.858 7.208 7.208 0 0 0-.878 3.46c0 4.021 3.278 7.277 7.318 7.277.527 0 1.04-.055 1.533-.16a.787.787 0 0 1 .81.316.733.733 0 0 1-.031.893A8.349 8.349 0 0 1 8.344 16C3.734 16 0 12.286 0 7.71 0 4.266 2.114 1.312 5.124.06A.752.752 0 0 1 6 .278zM4.858 1.311A7.269 7.269 0 0 0 1.025 7.71c0 4.02 3.279 7.276 7.319 7.276a7.316 7.316 0 0 0 5.205-2.162c-.337.042-.68.063-1.029.063-4.61 0-8.343-3.714-8.343-8.29 0-1.167.242-2.278.681-3.286z"/>
+          </svg>
+        </span>
+      </button>
+    </div>
 	</div>
 </footer>