How to remove network request failed error screen and display message "No internet connection" in react-native

How to remove network request failed error screen and display message "No internet connection" in react-native

In React Native, you can handle network connectivity errors and display a message like "No internet connection" using various libraries and techniques. Here's a step-by-step approach using the NetInfo API from React Native:

Step 1: Install Dependencies

Ensure you have the necessary dependencies installed:

npm install @react-native-community/netinfo

Step 2: Handle Network Connectivity

Create a utility function or component to handle network connectivity checks and display appropriate messages:

import React, { useEffect, useState } from 'react'; import { View, Text, StyleSheet, Alert } from 'react-native'; import NetInfo from '@react-native-community/netinfo'; const NetworkStatus = () => { const [isConnected, setIsConnected] = useState(true); useEffect(() => { const unsubscribe = NetInfo.addEventListener(state => { setIsConnected(state.isConnected); }); return () => { unsubscribe(); }; }, []); return ( <View style={styles.container}> {!isConnected && ( <View style={styles.errorContainer}> <Text style={styles.errorText}>No internet connection</Text> </View> )} {/* Your main application content here */} {isConnected && ( <View style={styles.contentContainer}> <Text>Main Application Content</Text> </View> )} </View> ); }; const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', alignItems: 'center', }, errorContainer: { backgroundColor: '#f8d7da', padding: 10, borderRadius: 5, marginBottom: 10, }, errorText: { color: '#721c24', fontSize: 16, fontWeight: 'bold', }, contentContainer: { alignItems: 'center', }, }); export default NetworkStatus;

Explanation:

  1. NetInfo API: This API from @react-native-community/netinfo allows you to subscribe to network status changes and get the current connectivity state (state.isConnected).

  2. UseEffect Hook: Registers an event listener when the component mounts (useEffect). It updates the isConnected state based on network changes and cleans up the listener on unmount (return () => unsubscribe()).

  3. Conditional Rendering: Conditionally render your main application content based on isConnected. If isConnected is false, display an error message indicating no internet connection.

  4. Styling: Adjust styles (styles.container, styles.errorContainer, styles.errorText, etc.) as per your design requirements for displaying error messages and main content.

Additional Considerations:

  • Error Handling: You can enhance error handling by displaying a retry button or integrating with libraries like react-native-toast-message for better UI/UX feedback.

  • Testing: Test your app's behavior in offline mode using emulators or physical devices with airplane mode to ensure robust handling of network connectivity issues.

  • Alternative Libraries: You may also consider using other libraries like react-native-offline, which provides more advanced features for managing offline/online states.

By following these steps, you can effectively manage network connectivity errors and display a message like "No internet connection" in your React Native application, ensuring a better user experience when network issues occur.

Examples

  1. React Native Check Internet Connection

    import React, { useState, useEffect } from 'react'; import { View, Text, StyleSheet } from 'react-native'; import NetInfo from "@react-native-community/netinfo"; const CheckConnection = () => { const [isConnected, setIsConnected] = useState(true); useEffect(() => { const unsubscribe = NetInfo.addEventListener(state => { setIsConnected(state.isConnected); }); return () => unsubscribe(); }, []); return ( <View style={styles.container}> {isConnected ? ( <Text style={styles.text}>You are online</Text> ) : ( <Text style={styles.text}>No internet connection</Text> )} </View> ); }; const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', alignItems: 'center' }, text: { fontSize: 18 } }); export default CheckConnection;

    Description: This code uses the @react-native-community/netinfo library to check for internet connectivity and display a message accordingly.

  2. React Native Handle Network Request Failed Error

    import React, { useState, useEffect } from 'react'; import { View, Text, StyleSheet } from 'react-native'; import NetInfo from "@react-native-community/netinfo"; const NetworkErrorHandling = () => { const [isConnected, setIsConnected] = useState(true); useEffect(() => { const unsubscribe = NetInfo.addEventListener(state => { setIsConnected(state.isConnected); }); return () => unsubscribe(); }, []); const fetchData = async () => { if (!isConnected) { alert("No internet connection"); return; } try { let response = await fetch('https://example.com/data'); let json = await response.json(); // handle data } catch (error) { alert("Network request failed"); } }; useEffect(() => { fetchData(); }, [isConnected]); return ( <View style={styles.container}> <Text style={styles.text}>{isConnected ? "Fetching data..." : "No internet connection"}</Text> </View> ); }; const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', alignItems: 'center' }, text: { fontSize: 18 } }); export default NetworkErrorHandling;

    Description: This code checks for internet connectivity before making a network request and displays an alert if the request fails due to a network error.

  3. React Native Show Offline Message

    import React, { useState, useEffect } from 'react'; import { View, Text, StyleSheet } from 'react-native'; import NetInfo from "@react-native-community/netinfo"; const ShowOfflineMessage = () => { const [isConnected, setIsConnected] = useState(true); useEffect(() => { const unsubscribe = NetInfo.addEventListener(state => { setIsConnected(state.isConnected); }); return () => unsubscribe(); }, []); return ( <View style={styles.container}> {!isConnected && ( <View style={styles.offlineContainer}> <Text style={styles.offlineText}>No internet connection</Text> </View> )} {/* Other components */} </View> ); }; const styles = StyleSheet.create({ container: { flex: 1 }, offlineContainer: { backgroundColor: '#b52424', height: 50, justifyContent: 'center', alignItems: 'center', flexDirection: 'row', width: '100%', position: 'absolute', top: 0 }, offlineText: { color: '#fff' } }); export default ShowOfflineMessage;

    Description: This code displays a banner message at the top of the screen when there is no internet connection.

  4. React Native Retry Network Request on Connection Restore

    import React, { useState, useEffect } from 'react'; import { View, Text, Button, StyleSheet } from 'react-native'; import NetInfo from "@react-native-community/netinfo"; const RetryOnConnectionRestore = () => { const [isConnected, setIsConnected] = useState(true); const [data, setData] = useState(null); useEffect(() => { const unsubscribe = NetInfo.addEventListener(state => { setIsConnected(state.isConnected); if (state.isConnected) { fetchData(); } }); return () => unsubscribe(); }, []); const fetchData = async () => { try { let response = await fetch('https://example.com/data'); let json = await response.json(); setData(json); } catch (error) { alert("Network request failed"); } }; return ( <View style={styles.container}> {isConnected ? ( data ? <Text>{JSON.stringify(data)}</Text> : <Text>Loading...</Text> ) : ( <Text>No internet connection</Text> )} <Button title="Retry" onPress={fetchData} disabled={isConnected} /> </View> ); }; const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', alignItems: 'center' }, text: { fontSize: 18 } }); export default RetryOnConnectionRestore;

    Description: This code retries a network request when the internet connection is restored and includes a retry button for manual retry.

  5. React Native Display Network Status in Header

    import React, { useState, useEffect } from 'react'; import { View, Text, StyleSheet } from 'react-native'; import NetInfo from "@react-native-community/netinfo"; const NetworkStatusHeader = () => { const [isConnected, setIsConnected] = useState(true); useEffect(() => { const unsubscribe = NetInfo.addEventListener(state => { setIsConnected(state.isConnected); }); return () => unsubscribe(); }, []); return ( <View style={styles.header}> <Text style={styles.headerText}>{isConnected ? "Online" : "No internet connection"}</Text> </View> ); }; const styles = StyleSheet.create({ header: { height: 50, justifyContent: 'center', alignItems: 'center', backgroundColor: '#f8f8f8' }, headerText: { fontSize: 18 } }); export default NetworkStatusHeader;

    Description: This code displays the network status in a header component, updating in real-time based on connectivity changes.

  6. React Native Network Error Handling with Redux

    // actions.js export const SET_CONNECTION_STATUS = 'SET_CONNECTION_STATUS'; export const setConnectionStatus = (status) => ({ type: SET_CONNECTION_STATUS, payload: status }); // reducer.js import { SET_CONNECTION_STATUS } from './actions'; const initialState = { isConnected: true }; export const networkReducer = (state = initialState, action) => { switch (action.type) { case SET_CONNECTION_STATUS: return { ...state, isConnected: action.payload }; default: return state; } }; // NetworkStatus.js import React, { useEffect } from 'react'; import { useDispatch, useSelector } from 'react-redux'; import { View, Text, StyleSheet } from 'react-native'; import NetInfo from "@react-native-community/netinfo"; import { setConnectionStatus } from './actions'; const NetworkStatus = () => { const dispatch = useDispatch(); const isConnected = useSelector(state => state.network.isConnected); useEffect(() => { const unsubscribe = NetInfo.addEventListener(state => { dispatch(setConnectionStatus(state.isConnected)); }); return () => unsubscribe(); }, [dispatch]); return ( <View style={styles.container}> <Text style={styles.text}>{isConnected ? "You are online" : "No internet connection"}</Text> </View> ); }; const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', alignItems: 'center' }, text: { fontSize: 18 } }); export default NetworkStatus;

    Description: This code integrates network status handling with Redux, allowing for centralized state management and updates across the app.

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