React Native Display Saved Data When The App Opens - react-native

Question

I have some problems with AsyncStorage and i was hoping that you can help me out. I have to write some notes and save them so when I open the app again, they will be displayed on a ListView.
Here are the classes I used:
Notes.js:
import React, { Component } from 'react';
import {
View,
Text,
StyleSheet,
TouchableOpacity,
} from 'react-native';
export default class Note extends Component {
render() {
return (
<View key={this.props.keyval} style={styles.note}>
<Text style={styles.noteText}>{this.props.val.date}</Text>
<Text style={styles.noteText}>{this.props.val.note}</Text>
<TouchableOpacity onPress={this.props.deleteMethod} style={styles.noteDelete}>
<Text style={styles.noteDeleteText}>Del</Text>
</TouchableOpacity>
</View>
);
}
}
const styles = StyleSheet.create({
note: {
position: 'relative',
padding: 20,
paddingRight: 100,
borderBottomWidth:2,
borderBottomColor: '#ededed'
},
noteText: {
paddingLeft: 20,
borderLeftWidth: 10,
borderLeftColor: '#0000FF'
},
noteDelete: {
position: 'absolute',
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#2980b9',
padding: 10,
top: 10,
bottom: 10,
right: 10
},
noteDeleteText: {
color: 'white'
}
});
This is the component that I use every time when I want to create a note.
Main.js:
import React, { Component } from 'react';
import {
View,
Text,
StyleSheet,
TextInput,
ScrollView,
TouchableOpacity,
AsyncStorage,
} from 'react-native';
import Note from './Note';
export default class Main extends Component {
constructor(props){
super(props);
this.state = {
noteArray: [],
noteText: '',
};
this.getSavedNotes(this.state.noteArray);
}
render() {
let notes = this.state.noteArray.map((val, key)=>{
return <Note key={key} keyval={key} val={val}
deleteMethod={()=>this.deleteNote(key)}/>
});
return (
<View style={styles.container}>
<View style={styles.header}>
<Text style={styles.headerText}>- NOTER -</Text>
</View>
<ScrollView style={styles.scrollContainer}>
{notes}
</ScrollView>
<View style={styles.footer}>
<TextInput
style={styles.textInput}
placeholder='Write your note here'
onChangeText={(noteText)=> this.setState({noteText})}
value={this.state.noteText}
placeholderTextColor='white'
underlineColorAndroid='transparent'>
</TextInput>
</View>
<TouchableOpacity onPress={ this.addNote.bind(this) } style={styles.addButton}>
<Text style={styles.addButtonText}>+</Text>
</TouchableOpacity>
</View>
);
}
addNote(){
if(this.state.noteText){
var d = new Date();
this.state.noteArray.push({
'date':d.getFullYear()+
"/"+(d.getMonth()+1) +
"/"+ d.getDate(),
'note': this.state.noteText
});
this.setState({ noteArray: this.state.noteArray });
this.setState({noteText:''});
AsyncStorage.setItem('arr', JSON.stringify(this.state.noteArray));
alert(this.state.noteArray);
}
}
deleteNote(key){
this.state.noteArray.splice(key, 1);
this.setState({noteArray: this.state.noteArray});
}
getSavedNotes = async (noteArray) =>{
try{
let data = await AsyncStorage.getItem('arr');
if(JSON.parse(data))
{
this.state.noteArray = JSON.parse(data);v
}
}catch(error){
alert(error);
}
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
},
header: {
backgroundColor: '#1A237E',
alignItems: 'center',
justifyContent:'center',
borderBottomWidth: 10,
borderBottomColor: '#ddd'
},
headerText: {
color: 'white',
fontSize: 18,
padding: 26
},
scrollContainer: {
flex: 1,
marginBottom: 100
},
footer: {
position: 'absolute',
bottom: 0,
backgroundColor: '#000000',
left: 0,
right: 70,
zIndex: 10
},
textInput: {
alignSelf: 'stretch',
color: '#fff',
padding: 20,
backgroundColor: '#252525',
borderTopWidth:2,
borderTopColor: '#ededed'
},
addButton: {
position: 'absolute',
zIndex: 11,
right: 0,
bottom: 0,
backgroundColor: '#1A237E',
width: 70,
height: 68,
// borderRadius: 35,
alignItems: 'center',
justifyContent: 'center',
elevation: 8
},
addButtonText: {
color: '#fff',
fontSize: 24
}
});
Here is where I try to save the notes. It seems like the notes are saved but they are not displayed as I open the app. They are displayed only after I tape a letter in the text box.
Finally the App.js:
import React, { Component } from 'react';
import Main from './app/components/Main.js';
export default class App extends Component {
render() {
return (
<Main/>
);
}
}
Here I just display the Main.js component.

Answer 1

getSavedNotes = async (noteArray) =>{
try{
let data = await AsyncStorage.getItem('arr');
data = JSON.parse(data);
this.setState({noteArray:data}) //assuming data as array of notes
}catch(error){
alert(error);
}
}