introduces useLocalStorage hook

frontend/src/App.tsx

@@ -12,6 +12,7 @@ import { setNestedValueByPath, State } from "./utils/stateUtils";
 import { WebSettingsContext, WebSetting } from "./WebSettings";
 import { GenericComponent } from "./components/GenericComponent";
 import { SerializedObject } from "./types/SerializedObject";
+import useLocalStorage from "./hooks/useLocalStorage";
 
 type Action =
   | { type: "SET_DATA"; data: State }
@@ -53,15 +54,15 @@ const App = () => {
   const [state, dispatch] = useReducer(reducer, null);
   const [serviceName, setServiceName] = useState<string | null>(null);
   const [webSettings, setWebSettings] = useState<Record<string, WebSetting>>({});
-  const [isInstantUpdate, setIsInstantUpdate] = useState(() => {
-    const saved = localStorage.getItem("isInstantUpdate");
-    return saved !== null ? JSON.parse(saved) : false;
-  });
+  const [isInstantUpdate, setIsInstantUpdate] = useLocalStorage(
+    "isInstantUpdate",
+    false,
+  );
   const [showSettings, setShowSettings] = useState(false);
-  const [showNotification, setShowNotification] = useState(() => {
-    const saved = localStorage.getItem("showNotification");
-    return saved !== null ? JSON.parse(saved) : false;
-  });
+  const [showNotification, setShowNotification] = useLocalStorage(
+    "showNotification",
+    false,
+  );
   const [notifications, setNotifications] = useState<Notification[]>([]);
   const [connectionStatus, setConnectionStatus] = useState("connecting");
 
@@ -115,14 +116,6 @@ const App = () => {
     };
   }, []);
 
-  // Persist isInstantUpdate and showNotification state changes to localStorage
-  useEffect(() => {
-    localStorage.setItem("isInstantUpdate", JSON.stringify(isInstantUpdate));
-  }, [isInstantUpdate]);
-
-  useEffect(() => {
-    localStorage.setItem("showNotification", JSON.stringify(showNotification));
-  }, [showNotification]);
   // Adding useCallback to prevent notify to change causing a re-render of all
   // components
   const addNotification = useCallback(

frontend/src/components/DataServiceComponent.tsx

@@ -1,10 +1,10 @@
-import { useEffect, useState } from "react";
 import React from "react";
 import { Card, Collapse } from "react-bootstrap";
 import { ChevronDown, ChevronRight } from "react-bootstrap-icons";
 import { GenericComponent } from "./GenericComponent";
 import { LevelName } from "./NotificationsComponent";
 import { SerializedObject } from "../types/SerializedObject";
+import useLocalStorage from "../hooks/useLocalStorage";
 
 interface DataServiceProps {
   props: DataServiceJSON;
@@ -19,15 +19,7 @@ export type DataServiceJSON = Record<string, SerializedObject>;
 export const DataServiceComponent = React.memo(
   ({ props, isInstantUpdate, addNotification, displayName, id }: DataServiceProps) => {
     // Retrieve the initial state from localStorage, default to true if not found
-    const [open, setOpen] = useState(() => {
-      const savedState = localStorage.getItem(`dataServiceComponent-${id}-open`);
-      return savedState !== null ? JSON.parse(savedState) : true;
-    });
-
-    // Update localStorage whenever the state changes
-    useEffect(() => {
-      localStorage.setItem(`dataServiceComponent-${id}-open`, JSON.stringify(open));
-    }, [open]);
+    const [open, setOpen] = useLocalStorage(`dataServiceComponent-${id}-open`, true);
 
     if (displayName !== "") {
       return (

frontend/src/hooks/useLocalStorage.ts

@@ -0,0 +1,18 @@
+import { useState, useEffect } from "react";
+
+export default function useLocalStorage(key: string, defaultValue: unknown) {
+  const [value, setValue] = useState(() => {
+    const storedValue = localStorage.getItem(key);
+    if (storedValue) {
+      return JSON.parse(storedValue);
+    }
+    return defaultValue;
+  });
+
+  useEffect(() => {
+    if (value === undefined) return;
+    localStorage.setItem(key, JSON.stringify(value));
+  }, [value, key]);
+
+  return [value, setValue];
+}