implemented page visibility api for cashier status

scripts/fn_pay.js

@@ -184,7 +184,6 @@ function statusReconnect() {
 }
 
 var status_interval_instance = null;
-// add page visibility API to startStatusInterval()
 function startStatusInterval() {
     if (status_interval_instance) {
         clearInterval(status_interval_instance);

scripts/fn_ui.js

@@ -15,6 +15,7 @@ function syncUserData(obsName, data) {
     const dataToSend = Crypto.AES.encrypt(JSON.stringify(data), myPrivKey);
     return floCloudAPI.sendApplicationData(dataToSend, obsName, { receiverID: myFloID });
 }
+// store user data in separate IDB 
 async function organizeSyncedData(obsName) {
     const fetchedData = await floCloudAPI.requestApplicationData(obsName, { mostRecent: true, senderIDs: [myFloID], receiverID: myFloID });
     if (fetchedData.length && await compactIDB.readData(obsName, 'lastSyncTime') !== fetchedData[0].time) {

scripts/std_ui.js

@@ -864,4 +864,13 @@ function randomString(length) {
         result += characters.charAt(Math.floor(Math.random() * charactersLength));
     }
     return result;
+}
+
+document.addEventListener("visibilitychange", handleVisibilityChange, false);
+function handleVisibilityChange() {
+    if (document.visibilityState === "hidden") {
+        // code if page is hidden 
+    } else {
+        startStatusInterval()
+    }
 }