Apple PWA fixes

app/js/main.js

@@ -8,25 +8,48 @@
  * @link    https://TheTempusProject.com
  * @license https://opensource.org/licenses/MIT [MIT LICENSE]
  */
+/**
+ * Progressive Web-App
+ **/
 let deferredPrompt;
 const installPrompt = document.getElementById("install-prompt");
+const chromeMessage = document.getElementById("chrome-install-message");
+const iosMessage = document.getElementById("ios-install-message");
 const installButton = document.getElementById("install-button");
 const dismissButton = document.querySelector("#install-prompt .btn-close");
 
 // Check if the user previously dismissed the prompt
-if (!localStorage.getItem("pwaInstallDismissed")) {
+if ( ! localStorage.getItem("pwaInstallDismissed") ) {
     window.addEventListener("beforeinstallprompt", (event) => {
         event.preventDefault();
         deferredPrompt = event;
         installPrompt.classList.remove("d-none");
-        installPrompt.classList.add("d-block"); // Show the prompt
+        installPrompt.classList.add("d-block"); // Show the alert
+        chromeMessage.classList.remove("d-none");
+        chromeMessage.classList.add("d-block"); // Show the prompt
     });
+
+    if ( isIos() && ! isInStandaloneMode() ) {
+        installPrompt.classList.remove("d-none");
+        installPrompt.classList.add("d-block"); // Show the alert
+        iosMessage.classList.remove("d-none");
+        iosMessage.classList.add("d-block"); // Show the prompt
+    }
 }
 
+// ios REQUIRES a service worker
+if ( 'serviceWorker' in navigator ) {
+    navigator.serviceWorker.register('app/js/sw.js')
+        .then(() => console.log('Service Worker Registered'));
+}
+// self.addEventListener('install', () => self.skipWaiting());
+// self.addEventListener('activate', () => self.clients.claim());
+// self.addEventListener('fetch', () => {}); // No file interception
+
 // Handle Install Button Click
 if ( installButton ) {
     installButton.addEventListener("click", async () => {
-        if (deferredPrompt) {
+        if ( deferredPrompt ) {
             deferredPrompt.prompt();
             const { outcome } = await deferredPrompt.userChoice;
 
@@ -65,6 +88,14 @@ if (localStorage.getItem("pwaInstallDismissed")) {
     }
 }
 
+function isIos() {
+    return /iphone|ipad|ipod/i.test(navigator.userAgent);
+}
+
+function isInStandaloneMode() {
+    return window.matchMedia('(display-mode: standalone)').matches || window.navigator.standalone;
+}
+
 /**
  * Automatically selects/de-selects all check boxes associated with that field
  **/

app/js/sw.js

@@ -0,0 +1 @@
+self.addEventListener('fetch', () => {});