How to render MainNavigator in React Native Realm Login

MongoDB Atlas App Services & Realm
1

I have successfully login and do some crud operation in realm. Now I have login screen and the user enter email and password, the login is successfully but how to render MainNavigator component, I have already built my app other API and I am useing Redux libraries, but now I am testing realm login so how to re-render the component when I login with realm.
Note is when I first login with realm it required user in realm config but got undefined MainNavigator,
but when I closed the app the app get render and I successfully go the dashbaord. So how to re-render the MainNavigator, I tried redux but still not getting the result.

You can the MainNavigtore code below

const appId = ‘MyApp Id’;

const appConfig = {

    id: appId,

    timeout: 10000,

};

const myapp = new Realm.App(appConfig)

const {currentUser} = myapp

console.log("my app ", myapp.currentUser);

return (

    <NavigationContainer initialRouteName="Auth">

        <Stack.Navigator initialRouteName="Auth">

            {

                Object.keys(USER.user).length == 0 || !myapp.currentUser ?

               

                (<Stack.Screen name="Auth" component={AuthNavigator} options={screenCofigWithoutHeader} />)

                :

                (<Stack.Screen name="Home" component={MyTabs} options={screenCofigWithoutHeader} />)

            }

        </Stack.Navigator>

    </NavigationContainer>

);

Capture
Capture1137×658 27.4 KB

2

To render a **MainNavigator** in React Native after a successful login with Realm, you can follow these steps:

  1. In your login component, create a function that will be called after the login is successful. This function should navigate to the **MainNavigator** screen.
const navigateToMain = () => {
  navigation.navigate('MainNavigator');
};
  1. In the login function, after the login is successful, call the ‘navigateToMain function’ to navigate to the MainNavigator screen.
const login = async () => {
  // Perform login with Realm
  // If login is successful, call navigateToMain
  navigateToMain();
};
  1. In your main app component, use the **createStackNavigator** function from the react-navigation library to create a stack navigator with a screen for the **MainNavigator** and any other screens that you want to include in the stack.
import { createStackNavigator } from 'react-navigation';

const MainNavigator = createStackNavigator({
  Main: {
    screen: MainScreen
  },
  Settings: {
    screen: SettingsScreen
  }
});
  1. In the main app component, use the **createAppContainer** function from the react-navigation library to create an app container with the **MainNavigator** as the root navigator.
import { createAppContainer } from 'react-navigation';

const AppContainer = createAppContainer(MainNavigator);
  1. Render the **AppContainer** component in the main app component.
render() {
  return (
    <AppContainer />
  );
}

I hope this helps! Let me know if you have any additional questions.

3

Thanks for the help, but before your message I somehow manage.

4

To render the MainNavigator in a React Native Realm Login implementation, you’ll need to set up your application to handle user authentication and navigation. Here’s a step-by-step guide:

Step 1: Install Dependencies

First, ensure you have the necessary dependencies installed:

bash

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npm install @react-navigation/native @react-navigation/stack react-native-reanimated react-native-gesture-handler react-native-screens react-native-safe-area-context @react-navigation/native-stack realm

Step 2: Set Up Navigation

Create a navigation setup using React Navigation.

AppNavigator.js

Create a file named AppNavigator.js to define your navigation structure.

javascript

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import React from 'react';
import { NavigationContainer } from '@react-navigation/native';
import { createStackNavigator } from '@react-navigation/stack';
import LoginScreen from './screens/LoginScreen';
import HomeScreen from './screens/HomeScreen';

const Stack = createStackNavigator();

const AppNavigator = () => {
  return (
    <NavigationContainer>
      <Stack.Navigator>
        <Stack.Screen name="Login" component={LoginScreen} />
        <Stack.Screen name="Home" component={HomeScreen} />
      </Stack.Navigator>
    </NavigationContainer>
  );
};

export default AppNavigator;

Step 3: Create Login and Home Screens

Create LoginScreen.js and HomeScreen.js in a screens directory.

LoginScreen.js

Handle user login and authentication with Realm.

javascript

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import React, { useState } from 'react';
import { View, TextInput, Button, StyleSheet } from 'react-native';
import Realm from 'realm';

const app = new Realm.App({ id: 'your-realm-app-id' }); // Replace with your Realm app ID

const LoginScreen = ({ navigation }) => {
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');

  const handleLogin = async () => {
    try {
      const credentials = Realm.Credentials.emailPassword(email, password);
      const user = await app.logIn(credentials);
      if (user) {
        navigation.navigate('Home');
      }
    } catch (error) {
      console.error('Failed to log in', error);
    }
  };

  return (
    <View style={styles.container}>
      <TextInput
        style={styles.input}
        placeholder="Email"
        value={email}
        onChangeText={setEmail}
        keyboardType="email-address"
      />
      <TextInput
        style={styles.input}
        placeholder="Password"
        value={password}
        onChangeText={setPassword}
        secureTextEntry
      />
      <Button title="Log In" onPress={handleLogin} />
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    padding: 20,
  },
  input: {
    height: 40,
    borderColor: 'gray',
    borderWidth: 1,
    marginBottom: 12,
    paddingHorizontal: 8,
  },
});

export default LoginScreen;

HomeScreen.js

Create a simple home screen that the user sees after logging in.

javascript

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import React from 'react';
import { View, Text, Button, StyleSheet } from 'react-native';
import Realm from 'realm';

const HomeScreen = ({ navigation }) => {
  const handleLogout = async () => {
    const user = Realm.App.currentUser;
    if (user) {
      await user.logOut();
      navigation.navigate('Login');
    }
  };

  return (
    <View style={styles.container}>
      <Text>Welcome to the Home Screen!</Text>
      <Button title="Log Out" onPress={handleLogout} />
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
});

export default HomeScreen;

Step 4: Render the Navigator in App.js

Finally, render the AppNavigator in your App.js.

App.js

javascript

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import React from 'react';
import AppNavigator from './AppNavigator';
import { LogBox } from 'react-native';

// Ignore all log notifications
LogBox.ignoreAllLogs();

const App = () => {
  return <AppNavigator />;
};

export default App;

Step 5: Configure the Realm App ID

Ensure you have the correct Realm App ID in your LoginScreen.js file:

javascript

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const app = new Realm.App({ id: 'your-realm-app-id' });

Replace 'your-realm-app-id' with the actual App ID from your Realm application.

Step 6: Run Your App

Run your React Native application:

bash

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npx react-native run-android
# or
npx react-native run-ios

This setup creates a basic login flow using Realm for authentication and React Navigation for managing screen transitions. Users will be able to log in and navigate to the home screen upon successful authentication.

4o