dowlnoad link on about page

Frontend/patient_manager/web/index.html

@@ -96,6 +96,7 @@
       document.body.style.background = "transparent";
     }
   </script>
+  <script src="install_pwa.js" defer></script>
   <!-- Splash screen -->
   <!-- <script>
     var dartPdfJsBaseUrl = "https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.2.146/";

Frontend/patient_manager/web/install_pwa.js

@@ -0,0 +1,33 @@
+let deferredPrompt;
+
+// add to homescreen
+window.addEventListener("beforeinstallprompt", (e) => {
+    // Prevent Chrome 67 and earlier from automatically showing the prompt
+    e.preventDefault();
+    // Stash the event so it can be triggered later.
+    deferredPrompt = e;
+});
+
+function isDeferredNotNull() {
+    return deferredPrompt != null;
+}
+
+function presentAddToHome() {
+    if (deferredPrompt != null) {
+        // Update UI to notify the user they can add to home screen
+        // Show the prompt
+        deferredPrompt.prompt();
+        // Wait for the user to respond to the prompt
+        deferredPrompt.userChoice.then((choiceResult) => {
+            if (choiceResult.outcome === "accepted") {
+                console.log("User accepted the A2HS prompt");
+            } else {
+                console.log("User dismissed the A2HS prompt");
+            }
+            deferredPrompt = null;
+        });
+    } else {
+        console.log("deferredPrompt is null");
+        return null;
+    }
+}