Leveraging React Native's Async Storage to store and retrieve values consistently within the Render method

Is there a way to set and get a value in the render method with just one line of code, by using a variable between tags? I attempted this approach but encountered an error message stating "Can't find variable: storage_key".

import React, { Component } from 'react'
import { View, Text } from 'react-native';
import AsyncStorage from '@react-native-async-storage/async-storage';

class SyncRu extends Component {
    state = {
       'storage_Key': ''
   }
   render() {
       const storeData = async (value) => {
          try {
            await AsyncStorage.setItem('@storage_Key', value)
        } catch (e) {
            // saving error
        }
    }
    const getData = async () => {
        try {
            const value = await AsyncStorage.getItem('@storage_Key')
            if (value !== null) {
                // value previously stored
            }
        } catch (e) {
            // error reading value
        }
    }
    return (
        <View>
            <Text>
                {storage_Key}
            </Text>
        </View>
    )
}
}
export default SyncRu

Answer №1

You need to make sure the state is initialized correctly. Instead of:

state = {
   'storage_Key': ''
}

You should do this:

this.state = {storage_Key: ""};

Once you retrieve your data from AsyncStorage, remember to use setState to update your UI.

const value = await AsyncStorage.getItem('@storage_Key')
if (value !== null) {
   this.setState({
      storage_Key: value
   });
}

Be sure to check out the React State Documentation for more information. React State Documentation

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