Fix: Sicherstellen, dass MapComponent innerhalb des RecoilRoot-Kontexts liegt

- Entfernt redundanten `RecoilRoot` aus `MapComponent`, um Probleme mit verschachtelten Wurzeln zu vermeiden.
- Sichergestellt, dass `MapComponent` immer innerhalb des zentralen `RecoilRoot` gerendert wird, der in `_app.js` definiert ist.
- Das Problem "Diese Komponente muss innerhalb einer `<RecoilRoot>`-Komponente verwendet werden" durch Platzieren aller Recoil-States im korrekten Kontext behoben.
- `ShowAddStationPopup` direkt als JSX-Element innerhalb von `MapComponent` zur besseren Übersicht verwendet.

components/MapComponent.js

@@ -1,6 +1,6 @@
 // components/MapComponent.js
 import React, { useEffect, useRef, useState } from "react";
-import ReactDOM from "react-dom/client"; // Import from 'react-dom/client'
+//import ReactDOM from "react-dom/client"; // Import from 'react-dom/client'
 import L, { marker } from "leaflet";
 import "leaflet/dist/leaflet.css";
 import "leaflet-contextmenu/dist/leaflet.contextmenu.css";
@@ -10,7 +10,7 @@ import dynamic from "next/dynamic";
 import "leaflet.smooth_marker_bouncing";
 import OverlappingMarkerSpiderfier from "overlapping-marker-spiderfier-leaflet";
 import DataSheet from "./DataSheet.js";
-import { useRecoilState, useRecoilValue, RecoilRoot } from "recoil";
+import { useRecoilState, useRecoilValue } from "recoil";
 import { gisStationsStaticDistrictState } from "../store/atoms/gisStationState.js";
 import { gisSystemStaticState } from "../store/atoms/gisSystemState.js";
 import { mapLayersState } from "../store/atoms/mapLayersState.js";
@@ -18,9 +18,23 @@ import { selectedAreaState } from "../store/atoms/selectedAreaState.js";
 import { zoomTriggerState } from "../store/atoms/zoomTriggerState.js";
 import { poiTypState } from "../store/atoms/poiTypState.js";
 import ShowAddStationPopup from "./ShowAddStationPopup";
+import { poiReadFromDbTriggerAtom } from '../store/atoms/poiReadFromDbTriggerAtom';
 //import { createRoot } from "react-dom/client";
 
 const MapComponent = ({ locations, onLocationUpdate }) => {
+
+  const [showPopup, setShowPopup] = useState(false);
+
+  const openPopup = () => setShowPopup(true);
+  const closePopup = () => setShowPopup(false);
+
+  const handleAddStation = (stationData) => {
+    // Station-Daten speichern oder API-Aufruf durchführen
+    console.log("Neue Station:", stationData);
+    closePopup(); // Schließt das Popup nach dem Hinzufügen
+  };
+
+  const poiReadTrigger = useRecoilValue(poiReadFromDbTriggerAtom);
   const [poiTypData, setPoiTypData] = useState(poiTypState); // Recoil State verwenden
   const poiLayerRef = useRef(null); // Referenz auf die Layer-Gruppe für Datenbank-Marker
   const mapRef = useRef(null); // Referenz auf das DIV-Element der Karte
@@ -257,7 +271,7 @@ const MapComponent = ({ locations, onLocationUpdate }) => {
         zoomControl: false,
         contextmenu: true,
         contextmenuItems: [
-          { text: "Station hinzufügen", callback: showAddStationPopup },
+          { text: "Station hinzufügen"},
           {
             text: "Station öffnen (Tab)",
             icon: "img/screen_new.png",
@@ -307,7 +321,8 @@ const MapComponent = ({ locations, onLocationUpdate }) => {
         // Rufe hier Funktionen auf, die eine initialisierte Karte benötigen.
       });
     }
-  }, [mapRef, map]); // Prüfe die Abhängigkeiten sorgfältig
+    console.log("trigger in MapComponent.js:", poiReadTrigger);
+  }, [mapRef, map, poiReadTrigger]); // Prüfe die Abhängigkeiten sorgfältig
 
   //------------------------------------------
   function parsePoint(pointString) {
@@ -339,7 +354,7 @@ const MapComponent = ({ locations, onLocationUpdate }) => {
         console.error("Fehler beim Abrufen der poiTyp Daten:", error);
       }
     };
-
+  console.log("trigger in MapComponent.js in fetchPoiTypData:", poiReadTrigger);
     fetchPoiTypData();
   }, []);
 
@@ -409,16 +424,16 @@ const MapComponent = ({ locations, onLocationUpdate }) => {
   };
   //-----Kontextmenu----ende------------
   // Ensure this function is only called when map is initialized and available
-  const showAddStationPopup = (e, map) => {
+/*   const showAddStationPopup = (e, map) => {
    const container = L.DomUtil.create("div");
 
     // Create a root container for the React component inside the popup
     const root = ReactDOM.createRoot(container);
 
     root.render(
-      <RecoilRoot>
+     
         <ShowAddStationPopup map={initMap} latlng={e.latlng} />
-      </RecoilRoot>
+ 
     );
 
     // Create and configure the popup
@@ -428,22 +443,22 @@ const MapComponent = ({ locations, onLocationUpdate }) => {
     initMap.on("popupclose", () => {
       root.unmount(); // Use unmount method from the root
     });
-  };
+  }; */
 
   // Inside your ShowAddStationPopup component
-  useEffect(() => {
+/*   useEffect(() => {
     // Cleanup function to unmount React component
     return () => {
       if (container._reactRoot) {
         container._reactRoot.unmount();
       }
     };
-  }, []);
+  }, []); */
 
   //------------------------------------------
 
   // Hinzufügen eines neuen Standorts (Marker) in MySQL-DB-Tabelle (poi)
-  async function handleSubmit(event) {
+/*   async function handleSubmit(event) {
     event.preventDefault();
     const form = event.target;
 
@@ -478,7 +493,7 @@ const MapComponent = ({ locations, onLocationUpdate }) => {
       console.error("Fehler beim Hinzufügen der Station");
       // Fehlerbehandlung
     }
-  }
+  } */
 
   //---------------------------------------
 
@@ -547,17 +562,25 @@ const MapComponent = ({ locations, onLocationUpdate }) => {
       if (map && poiLayerRef.current) {
         // Entfernen der dbLayer bei Unmount
         map.removeLayer(poiLayerRef.current);
-        poiLayerRef.current = null;
+        poiLayerRef.current = new L.LayerGroup().addTo(map);
       }
+        locations.forEach((location) => {
+      // Fügen Sie hier die Logik hinzu, um Marker zu erstellen und zu konfigurieren
+    });
     };
-  }, [map]); // Dieser Effekt läuft nur, wenn sich `map` ändert
+    console.log("trigger in MapComponent.js:", poiReadTrigger);
+  }, [map,locations, poiReadTrigger]); // Dieser Effekt läuft nur, wenn sich `map` ändert
   //------------------------------------------
+  //          poiLayerRef
+  //--------------------------------------------  
+
   useEffect(() => {
     if (map && poiLayerRef.current) {
-      // Sicherstellen, dass die alte dbLayer entfernt wird
+      // Entfernen Sie die bestehende Ebene und erstellen Sie eine neue
       map.removeLayer(poiLayerRef.current);
       poiLayerRef.current = new L.LayerGroup().addTo(map);
   
+      // Fügen Sie die aktualisierten Marker hinzu
       locations.forEach((location) => {
         const { latitude, longitude } = parsePoint(location.position);
         const marker = L.marker([latitude, longitude], {
@@ -571,13 +594,14 @@ const MapComponent = ({ locations, onLocationUpdate }) => {
           id: location.idPoi,
         });
   
-        // Popup binden, aber nicht automatisch öffnen
+        // Popup konfigurieren
         marker.bindPopup(
-          //N/A oder location.idPoiTyp=0 hier soll der Name von poiTyp Tabelle kommen, also foreign key
+          `<b>${location.description || "Unbekannt"}</b><br>Type: ${
-          `<b>${location.description || "Unbekannt"}</b><br>Type: ${location.idPoiTyp || "N/A oder location.idPoiTyp=0"}<br>Lat: ${latitude.toFixed(5)}, Lng: ${longitude.toFixed(5)}`
+            location.idPoiTyp || "N/A"
+          }<br>Lat: ${latitude.toFixed(5)}, Lng: ${longitude.toFixed(5)}`
         );
   
-        // Event-Handler für Mouseover und Mouseout hinzufügen
+        // Event-Handler hinzufügen
         marker.on("mouseover", function () {
           this.openPopup();
         });
@@ -585,19 +609,23 @@ const MapComponent = ({ locations, onLocationUpdate }) => {
           this.closePopup();
         });
   
-        marker.on("dragend", function (e) {
+        marker.on("dragend", (e) => {
           const newLat = e.target.getLatLng().lat;
           const newLng = e.target.getLatLng().lng;
           const markerId = e.target.options.id;
           updateLocationInDatabase(markerId, newLat, newLng).then(() => {
             onLocationUpdate(markerId, newLat, newLng);
+            console.log("trigger in MapComponent.js:", poiReadTrigger);
           });
         });
   
         marker.addTo(poiLayerRef.current);
       });
     }
-  }, [map, locations, onLocationUpdate]); // Dieser Effekt läuft, wenn `map`, `locations` oder `onLocationUpdate` sich ändern
+   
+  }, [map, locations, onLocationUpdate,poiReadTrigger]);
+  
+  //------------------------------------------
 
   function parsePoint(position) {
     const [longitude, latitude] = position.slice(6, -1).split(" ");
@@ -1476,10 +1504,30 @@ const MapComponent = ({ locations, onLocationUpdate }) => {
     }
   }, [map, zoomTrigger]);
 
+  //---------------------------------------------------------
+  useEffect(() => {
+    console.log("Aktualisierung in MapComponent.js:", poiReadTrigger);
+
+    // Logik zur Aktualisierung der Map hier hinzufügen
+    // Beispiel: Daten neu laden oder aktualisieren
+
+}, [poiReadTrigger]); 
   //---------------------------------------------------------
 
   return (
     <>
+        <div>
+      <button onClick={openPopup}>Neue Station hinzufügen</button>
+      
+      {/* Direkt als JSX verwenden */}
+      {showPopup && (
+        <ShowAddStationPopup
+          onClose={closePopup}
+          onSubmit={handleAddStation}
+          latlng={{ lat: 52.5200, lng: 13.4050 }} // Beispielkoordinaten
+        />
+      )}
+    </div>
       <DataSheet className="z-50" />
 
       <div

components/ShowAddStationPopup.js

@@ -1,16 +1,33 @@
 // components/ShowAddStationPopup.js
-import React, { useState, useEffect } from "react";
+import React, { useState, useEffect, use } from "react";
 import ReactDOM from "react-dom";
-import { useRecoilValue } from "recoil";
+import { useRecoilValue ,useRecoilState, useSetRecoilState } from "recoil";
 import { readPoiMarkersStore } from "../store/selectors/readPoiMarkersStore";
+import { poiReadFromDbTriggerAtom } from '../store/atoms/poiReadFromDbTriggerAtom';
+
 const ShowAddStationPopup = ({ map, latlng }) => {
-  const loadData = useRecoilValue(readPoiMarkersStore);
+ 
   const [poiTypData2, setPoiTypData2] = useState(); // Recoil State verwenden
   const [name, setName] = useState("");
   const [poiTypeId, setPoiTypeId] = useState(""); // Initialize as string
   const [latitude] = useState(latlng.lat.toFixed(5));
   const [longitude] = useState(latlng.lng.toFixed(5));
+  const setLoadData = useSetRecoilState(readPoiMarkersStore);
+  const setTrigger = useSetRecoilState(poiReadFromDbTriggerAtom);
 
+
+/*   useEffect(() => {
+    if (map && loadData) {
+      
+      console.log("Map and loadData are defined in ShowAddStationPopup.js", map);
+      console.log("loadData object in ShowAddStationPopup.js:", loadData);
+      // Your code here
+    }else{
+      console.log("Map and loadData are not defined in ShowAddStationPopup.js");
+    }
+  }, [map, loadData]); */
+
+// In Kontextmenü-Formular Typen anzeigen
   useEffect(() => {
     const fetchPoiTypData2 = async () => {
       try {
@@ -32,33 +49,41 @@ const ShowAddStationPopup = ({ map, latlng }) => {
     fetchPoiTypData2();
   }, []);
 
+//-----------------handleSubmit-------------------
 const handleSubmit = async (event) => {
   event.preventDefault();
   const formData = {
-      name, // Name der Station
+      name,
-      poiTypeId, // Typ der Station, logged as idPoiTyp
+      poiTypeId,
-      latitude, // Breitengrad
+      latitude,
-      longitude, // Längengrad
+      longitude,
   };
 
-    fetch("/api/addLocation", {
+  const response = await fetch("/api/addLocation", {
       method: "POST",
       headers: { "Content-Type": "application/json" },
       body: JSON.stringify(formData),
-    })
+  });
-      .then((response) => response.json())
+
-      .then((data) => console.log(data)) // Handle the response data
+  if (response.ok) {
-      .catch((error) => console.error(error)); // Handle any errors
+      setTrigger((trigger) => {
-    await loadData();
+          console.log("Aktueller Trigger-Wert:", trigger); // Vorheriger Wert
+          const newTrigger = trigger + 1;
+          console.log("Neuer Trigger-Wert:", newTrigger); // Aktualisierter Wert
+          return newTrigger;
+      });
+  } else {
+      console.error("Fehler beim Hinzufügen des POI");
+  }
 
-    // Check if map is not undefined and call closePopup
   if (map && typeof map.closePopup === "function") {
       map.closePopup();
-    } else {
-      console.error("Map object is undefined or closePopup is not a function");
   }
 };
 
+
+  
+
   return (
     <form onSubmit={handleSubmit} className="m-0 p-2 w-full ">
       <div className="flex items-center mb-4">

config/config.js

@@ -23,17 +23,17 @@ if (typeof window !== "undefined") {
   user = url.searchParams.get("u") || "484"; // Ein weiterer Parameter aus der URL, Standardwert ist '484 admin zu testen von Stationen ausblenden und einblenden in der Card'
 
   // Konstruktion von URLs, die auf spezifische Ressourcen auf dem Server zeigen
-  mapGisStationsStaticDistrictUrl = `${serverURL}/talas5/ClientData/WebserviceMap.asmx/GisStationsStaticDistrict?idMap=${c}&idUser=${user}`; //idMap: 10, idUser: 484
+ /*  mapGisStationsStaticDistrictUrl = `${serverURL}/talas5/ClientData/WebserviceMap.asmx/GisStationsStaticDistrict?idMap=${c}&idUser=${user}`; //idMap: 10, idUser: 484
   mapGisStationsStatusDistrictUrl = `${serverURL}/talas5/ClientData/WebserviceMap.asmx/GisStationsStatusDistrict?idMap=${c}&idUser=${user}`;
   mapGisStationsMeasurementsUrl = `${serverURL}/talas5/ClientData/WebserviceMap.asmx/GisStationsMeasurements?idMap=${c}`;
   mapGisSystemStaticUrl = `${serverURL}/talas5/ClientData/WebserviceMap.asmx/GisSystemStatic?idMap=${c}&idUser=${user}`;
-  mapDataIconUrl = `${serverURL}/talas5/ClientData/WebserviceMap.asmx/GetIconsStatic`;
+  mapDataIconUrl = `${serverURL}/talas5/ClientData/WebserviceMap.asmx/GetIconsStatic`; */
 
-  /*  mapGisStationsStaticDistrictUrl = `${serverURL}/talas5/ClientData/WebserviceMap.asmx/GisStationsStaticDistrict`;
+   mapGisStationsStaticDistrictUrl = `${serverURL}/talas5/ClientData/WebserviceMap.asmx/GisStationsStaticDistrict`;
   mapGisStationsStatusDistrictUrl = `${serverURL}/talas5/ClientData/WebserviceMap.asmx/GisStationsStatusDistrict`;
   mapGisStationsMeasurementsUrl = `${serverURL}/talas5/ClientData/WebserviceMap.asmx/GisStationsMeasurements`;
   mapGisSystemStaticUrl = `${serverURL}/talas5/ClientData/WebserviceMap.asmx/GisSystemStatic`;
-  mapDataIconUrl = `${serverURL}/talas5/ClientData/WebserviceMap.asmx/GetIconsStatic`; */
+  mapDataIconUrl = `${serverURL}/talas5/ClientData/WebserviceMap.asmx/GetIconsStatic`;
 }
 
 // Export der definierten Variablen und URLs, damit sie in anderen Teilen der Anwendung verwendet werden können

pages/api/[...path].js

@@ -2,8 +2,8 @@
 import { createProxyMiddleware } from "http-proxy-middleware";
 
 export default createProxyMiddleware({
-  target: "http://10.10.0.13", // Ziel-URL des Proxys
+  //target: "http://10.10.0.13", // Ziel-URL des Proxys
-  //target: "http://192.168.10.187:3000", // Ziel-URL des Proxys
+  target: "http://192.168.10.187:3000", // Ziel-URL des Proxys
   changeOrigin: true,
   pathRewrite: {
     "^/api": "/", // Optional: Entfernt /api aus dem Pfad, wenn das Backend dies nicht erfordert

pages/index copy.js

@@ -1,98 +0,0 @@
-// pages/index.js
-import { useEffect, useState } from "react";
-import dynamic from "next/dynamic";
-import { useSetRecoilState } from "recoil";
-import { readPoiMarkersStore } from "../store/selectors/readPoiMarkersStore";
-const MapComponentWithNoSSR = dynamic(
-  () => import("../components/MapComponent"),
-  { ssr: false }
-);
-
-export default function Home() {
-  const setLoadData = useSetRecoilState(readPoiMarkersStore);
-  const [mParam, setMParam] = useState([""]);
-  const [uParam, setUParam] = useState([""]);
-
-  const [locations, setLocations] = useState([]);
-  const [formData, setFormData] = useState({
-    name: "",
-    longitude: "",
-    latitude: "",
-    type: "",
-  });
-
-  const loadData = async () => {
-    const response = await fetch("/api/readLocations");
-    const data = await response.json();
-    setLocations(data);
-  };
-  useEffect(() => {
-    setLoadData(async () => {
-      const response = await fetch("/api/readLocations");
-      const data = await response.json();
-      setLocations(data); // Überlegungen für setLocations beachten
-    });
-  }, []);
-
-  useEffect(() => {
-    // Funktion, um URL-Parameter zu holen
-    function getURLParameter(name) {
-      // Nutze URLSearchParams, eine Web API für die Arbeit mit Query-Strings
-      const params = new URLSearchParams(window.location.search);
-      return params.get(name); // Holt den Wert des Parameternamens
-    }
-
-    // Hole die Parameter 'm' und 'u'
-    setMParam(getURLParameter("m"));
-    setUParam(getURLParameter("u"));
-
-    // Logge die Werte in der Konsole
-    console.log(`Parameter m: ${mParam}, Parameter u: ${uParam}`);
-    loadData();
-  }, []);
-  const handleAddLocation = async (name, type, lat, lng) => {
-    const response = await fetch("/api/addLocation", {
-      method: "POST",
-      headers: { "Content-Type": "application/json" },
-      body: JSON.stringify({
-        name,
-        type,
-        latitude: lat,
-        longitude: lng,
-      }),
-    });
-
-    if (response.ok) {
-      console.log("Standort erfolgreich hinzugefügt");
-      setFormData({ name: "", longitude: "", latitude: "", type: "" }); // Formular zurücksetzen
-      loadData(); // Daten erneut laden
-    } else {
-      console.error("Fehler beim Hinzufügen des Standorts");
-    }
-  };
-
-  const handleLocationUpdate = (id, newLatitude, newLongitude) => {
-    setLocations((prevLocations) => {
-      return prevLocations.map((location) => {
-        if (location.idPoi === id) {
-          return {
-            ...location,
-            // Hier musst du ggf. die Formatierung anpassen, je nachdem wie du die Koordinaten speicherst
-            position: `POINT(${newLongitude} ${newLatitude})`,
-          };
-        }
-        return location;
-      });
-    });
-  };
-  return (
-    <div>
-      {/* Ihr Formular */}
-      <MapComponentWithNoSSR
-        locations={locations}
-        onAddLocation={handleAddLocation}
-        onLocationUpdate={handleLocationUpdate}
-      />
-    </div>
-  );
-}

pages/index.js

@@ -1,93 +1,85 @@
 // pages/index.js
 import { useEffect, useState } from "react";
 import dynamic from "next/dynamic";
-import { useSetRecoilState } from "recoil";
+import { useRecoilState , useRecoilValue} from "recoil";
-import { readPoiMarkersStore } from "../store/selectors/readPoiMarkersStore";
+import { readPoiMarkersStore } from "../store/selectors/readPoiMarkersStore"; // Aktualisiert mit atom
+import { poiReadFromDbTriggerAtom } from '../store/atoms/poiReadFromDbTriggerAtom';
+
 const MapComponentWithNoSSR = dynamic(
   () => import("../components/MapComponent"),
   { ssr: false }
 );
 
 export default function Home() {
-  const setLoadData = useSetRecoilState(readPoiMarkersStore);
+  const poiReadTrigger = useRecoilValue(poiReadFromDbTriggerAtom);
-  const [mParam, setMParam] = useState([""]);
+  const [locations, setLocations] = useRecoilState(readPoiMarkersStore);
-  const [uParam, setUParam] = useState([""]);
+  const [mParam, setMParam] = useState("");
-
+  const [uParam, setUParam] = useState("");
-  const [locations, setLocations] = useState([]);
-  const [formData, setFormData] = useState({
-    name: "",
-    longitude: "",
-    latitude: "",
-    type: "",
-  });
 
   const loadData = async () => {
+    try {
       const response = await fetch("/api/readLocations");
+      if (!response.ok) {
+        throw new Error("Fehler beim Laden der Standortdaten");
+      }
       const data = await response.json();
       setLocations(data);
-  };
+      console.log("Geladene Daten in Home.js:", data);
-  useEffect(() => {
+    } catch (error) {
-    setLoadData(async () => {
+      console.error(error.message);
-      const response = await fetch("/api/readLocations");
-      const data = await response.json();
-      setLocations(data); // Überlegungen für setLocations beachten
-    });
-  }, []);
-
-  useEffect(() => {
-    // Funktion, um URL-Parameter zu holen
-    function getURLParameter(name) {
-      // Nutze URLSearchParams, eine Web API für die Arbeit mit Query-Strings
-      const params = new URLSearchParams(window.location.search);
-      return params.get(name); // Holt den Wert des Parameternamens
     }
+  };
 
-    // Hole die Parameter 'm' und 'u'
+  useEffect(() => {
+    // URL-Parameter abfragen
+    function getURLParameter(name) {
+      const params = new URLSearchParams(window.location.search);
+      return params.get(name);
+    }
     setMParam(getURLParameter("m"));
     setUParam(getURLParameter("u"));
 
-    // Logge die Werte in der Konsole
+    // Daten beim Laden der Seite holen
-    console.log(`Parameter m: ${mParam}, Parameter u: ${uParam}`);
     loadData();
-  }, []);
+    console.log("poiReadTrigger in Home.js:", poiReadTrigger);
+  }, [poiReadTrigger]);
+
   const handleAddLocation = async (name, type, lat, lng) => {
+    try {
       const response = await fetch("/api/addLocation", {
         method: "POST",
         headers: { "Content-Type": "application/json" },
-      body: JSON.stringify({
+        body: JSON.stringify({ name, type, latitude: lat, longitude: lng }),
-        name,
-        type,
-        latitude: lat,
-        longitude: lng,
-      }),
       });
-
+      if (!response.ok) {
-    if (response.ok) {
+        throw new Error("Fehler beim Hinzufügen des Standorts");
+      }
       console.log("Standort erfolgreich hinzugefügt");
-      setFormData({ name: "", longitude: "", latitude: "", type: "" }); // Formular zurücksetzen
+      loadData(); // Aktualisiere die Daten nach dem Hinzufügen
-      loadData(); // Daten erneut laden
+      console.log("poiReadTrigger in Home.js:", poiReadTrigger);
-    } else {
+    } catch (error) {
-      console.error("Fehler beim Hinzufügen des Standorts");
+      console.error(error.message);
     }
   };
 
   const handleLocationUpdate = (id, newLatitude, newLongitude) => {
-    setLocations((prevLocations) => {
+    setLocations((prevLocations) =>
-      return prevLocations.map((location) => {
+      prevLocations.map((location) =>
-        if (location.idPoi === id) {
+        location.idPoi === id
-          return {
+          ? { ...location, position: `POINT(${newLongitude} ${newLatitude})` }
-            ...location,
+          : location
-            // Hier musst du ggf. die Formatierung anpassen, je nachdem wie du die Koordinaten speicherst
+      )
-            position: `POINT(${newLongitude} ${newLatitude})`,
+    );
-          };
-        }
-        return location;
-      });
-    });
   };
+//------------------------------------
+  // Daten beim Laden der Seite holen
+  useEffect(() => {
+    loadData();
+    console.log("poiReadTrigger in Home.js:", poiReadTrigger);
+  }, [poiReadTrigger]);
+//------------------------------------
   return (
     <div>
-      {/* Ihr Formular */}
       <MapComponentWithNoSSR
         locations={locations}
         onAddLocation={handleAddLocation}

store/atoms/poiReadFromDbTriggerAtom.js

@@ -0,0 +1,7 @@
+// store/atoms/poiReadFromDbTriggerAtom.js
+import { atom } from 'recoil';
+
+export const poiReadFromDbTriggerAtom = atom({
+  key: 'poiReadFromDbTriggerAtom',
+  default: 0, // Sie können auch einen booleschen Wert verwenden
+});

store/selectors/readPoiMarkersStore.js

@@ -1,11 +1,7 @@
-// store/readPoiMarkersStore.js
+//store/selectors/readPoiMarkersStore.js
-import { atom } from "recoil";
+import { atom } from 'recoil';
 
 export const readPoiMarkersStore = atom({
-  key: "readPoiMarkersStore",
+  key: 'readPoiMarkersStore',
-  default: async () => {
+  default: [],
-    const response = await fetch("/api/readLocations");
-    const data = await response.json();
-    return data;
-  },
 });