I am trying to get data from AsyncStorage and eventually map this data to a list of buttons on my home screen. The data is saved to AsyncStorage from an API call that is made upon login.
In my async function, I am able to successfully retreive the data from AsyncStorage and parse it into JSON format, and then log it to the console. It looks like this:
{
1 : {title:"Timesheet",component_name:"Timesheet"}
2 : {title:"Personal Info",component_name:"PersonalInfo"}
3 : {title:"Employee Directory",component_name:"EmployeeListing"}
}
The problem I am running into is that I can’t save this data to my useState variable and then render it into the component after useState is updated by my async function. Every time I try to access this data, I either get null
or a Promise
object. How can I access the data after useState is updated? Do I need to use a different React hook to call the Async function?
Here is the code that I am using:
import { Text, View, StyleSheet } from 'react-native';
import { useState, useEffect } from 'react';
import AsyncStorage from '@react-native-async-storage/async-storage';
export default function HomeScreen() {
const [buttonData, setButtonData] = useState(null);
useEffect (() => {
const loadHomeScreenButtons = async () => {
try {
const buttons = await AsyncStorage.getItem('app_screens').then(screens => {
// Parse the JSON data from its stored string format into an object.
let app_screens_json = JSON.parse(screens);
let app_screens_list = app_screens_json.app_screens;
console.log(app_screens_list); // This outputs the data to the console.
setButtonData(app_screens_list); // Trying to set the button data in useState.
return app_screens_list;
});
}
catch (e) {
console.log(e)
}
}
loadHomeScreenButtons();
}, [])
return (
<View style={home_styles.container}>
<Text>{buttonData[1]["title"]}</Text>
</View>
);
}
2
Answers
You just need to render a loading component until your data is fetched.
You are getting an error as you are trying to access a property that does not exist at the render.
Try this way