Access state data in other component - react-native

Hi how can I access the state where I'm fetching all the data in an other component ? I have a component Accueil where I'm fetching the data and a component UserItem where I'm styling and showing the info. So I'm in my Accueil component I have a flatlist and inside this flatlist in the renderItem function I'm passing the . So how can I access the state dataSource in UserItem ?
class UserItem extends React.Component {
render() {
const user = this.props.user;
const displayDetailForUser = this.props.displayDetailForUser;
var colorConnected;
if (user.Statut == "ON") {
colorConnected = "#1fbc26";
}
else if (user.Statut == "OFF") {
colorConnected = "#ff0303";
}
else {
colorConnected = "#ffd200";
}
return (
<TouchableOpacity style={styles.view_container} onPress={() =>
displayDetailForUser(user.MembreId, user.Pseudo, user.Photo, user.Age, user.Genre, user.Description, user.distance, user.Statut, user.localisation, user.principale )}>
<ImageBackground source={{ uri : user.Photo}} style={{ flex: 1, aspectRatio: 1, position: 'relative', borderColor: '#d6d6d6', borderWidth: 1}}>
<View style={[styles.bulle_presence, { backgroundColor: colorConnected } ]}></View>
<TouchableOpacity>
<Image style = {{aspectRatio:0.6, position:'absolute', resizeMode:'contain', height:40, width:40, right:15, top:15 }} source = {require("../Images/chat-bg.png")}/>
</TouchableOpacity>
</ImageBackground>
<View style={{ backgroundColor: '#d6d6d6', padding: 6 }}>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<View>
<Text style={{ fontSize: 25 }}>{user.Age}</Text>
</View>
<View style={{ marginRight: 7, marginLeft: 7, backgroundColor: '#000000', width: 1, height: 26 }}></View>
<View style={{ flexDirection: 'column', flex:1 }}>
<Text style={{ fontSize: 13, fontWeight: '600' }}>{user.Pseudo}</Text>
<View style={{ flexDirection: 'row', justifyContent: 'space-between'}}>
<Text style={{ fontSize: 12 }}>{user.distance}</Text>
<Text style={{ fontSize: 12 }}>{user.Genre}</Text>
</View>
</View>
</View>
</View>
</TouchableOpacity>
)
}
}
I've tried with const user = this.props.dataSource but it's not working. Thanks
Edit:
lass Accueil extends React.Component {
constructor(props) {
super(props);
this.state = {
loading: false,
refreshing: false,
location: null,
latitude:null,
longitude:null,
dataSource:[]
}
this.displayPosition = this.displayPosition.bind(this);
}
handleRefresh = () => {
this.setState (
{
refreshing: true,
},
() => {
setTimeout(() => {this.setState({refreshing: false,})}, 1000)
}
);
};
componentDidMount() {
const url = "SomeUrl";
fetch(url)
.then(res => res.json())
.then(res => {
this.setState({
dataSource: res
});
})
.catch(error => {
console.log("get data error:" + error);
});
}
static navigationOptions = ({ navigation }) => {
return {
headerRight: () => (
<View style={{marginLeft: 8, marginRight: 8, flexDirection: 'row', alignItems: 'center' }}>
<TouchableOpacity style={{ marginRight: 10 }} onPress={ () =>{ }}>
<Image style={{ width: 22, height: 22 }} source={require("../Images/search.png")} />
</TouchableOpacity>
<TouchableOpacity style={{marginLeft: 10, marginRight: 10 }} onPress={ () =>{{this.displayPosition()}}}>
<Image style={{ width: 22, height: 22 }} source={require("../Images/localisation.png")} />
</TouchableOpacity>
<TouchableOpacity style={{marginLeft: 10 }} onPress={ () =>{ }}>
<Image style={{ width: 22, height: 22 }} source={require("../Images/refresh.png")} />
</TouchableOpacity>
</View>
),
};
};
displayPosition = () => {
Geolocation.getCurrentPosition(
(position) => {
this.setState({
latitude: JSON.stringify(position.coords.latitude),
longitude: JSON.stringify(position.coords.longitude),
error: null,
});
console.log(this.state.latitude)
},
(error) => this.setState({ error: error.message }),
{ enableHighAccuracy: true, timeout: 20000, maximumAge: 1000 },
);
}
_displayDetailForUser = (idUser, name, photo, age, pratique, description, distance, Statut, localisation, principale ) => {
//console.log("Display user with id " + idUser);
this.props.navigation.navigate("UserProfil", { idUser: idUser, name:name, photo: photo, age:age, pratique:pratique, description:description, distance:distance, Statut:Statut, localisation:localisation, principale:principale });
}
render() {
return (
<SafeAreaView style={{ flex:1 }}>
<View style={styles.main_container}>
<FlatList style={styles.flatList}
data={this.state.dataSource}
keyExtractor={(item) => item.MembreId}
renderItem={() => <UserItem user={this.state.dataSource} displayDetailForUser={this._displayDetailForUser} />}
numColumns={numColumns}
refreshing={this.state.refreshing}
onRefresh={this.handleRefresh} />
</View>
</SafeAreaView>
)
}
}

Related

flatlist slow performance on large data react native

I'm new to react native and I'm having some performance problem with flatlist in React Native Expo. On my screen I'm displaying a list of contacts and I want them to be selected or deselected and I have managed to achieve that part but the problem is that it takes a lot of visibility time to check the contacts or to uncheck them. Making the screen not very user friendly. I have tried a lot of solutions that I've found on internet regarding this problem but none of them had worked. Hope someone can help me. Below I'll attach the code!
function ContactList() {
const [itemChecked, setItemChecked] = useState([]);
const [checked, setChecked] = useState(false);
const [contacts, setContacts] = useState([]);
const [filter, setFilter] = useState([]);
const [search, setSearch] = useState('');
const [checkedBox, setCheckedBox] = useState(false);
useEffect(() => {
(async () => {
const { status } = await Contacts.requestPermissionsAsync();
if (status === 'granted') {
const { data } = await Contacts.getContactsAsync({
fields: [Contacts.Fields.PhoneNumbers],
// fields: [Contacts.Fields.Name],
});
if (data.length > 0) {
setContacts(data);
setFilter(data);
// console.log('contact', contacts[1]);
// console.log('filter', filter);
}
}
})();
}, []);
const searchFilter = (text) => {
if (text) {
const newData = contacts.filter((item) => {
const itemData = item.name ? item.name.toUpperCase() : ''.toUpperCase();
const textData = text.toUpperCase();
return itemData.indexOf(textData) > -1;
});
setFilter(newData);
setSearch(text);
} else {
setFilter(contacts);
setSearch(text);
}
};
const onChangeValue = (item, index) => {
if (itemChecked.includes(item.phoneNumbers[0].digits)) {
itemChecked.splice(itemChecked.indexOf(item.phoneNumbers[0].digits), 1);
} else {
itemChecked.push(item.phoneNumbers[0].digits);
setCheckedBox(true);
}
setItemChecked(itemChecked);
console.log(itemChecked);
// console.log(item);
};
const renderItem = ({ item, index }) => {
return (
<SafeAreaView>
<ScrollView>
<TouchableOpacity style={{ flexDirection: 'row', flex: 1 }}>
<View style={{ flex: 1, borderTopWidth: 0.5, borderTopColor: 'grey', marginBottom: 15 }}>
<Text onPress={() => setChecked(true)} style={{ fontSize: 20, marginHorizontal: 10 }}>
{item.name + ' '}
</Text>
<Text style={{ fontSize: 17, marginHorizontal: 10, marginTop: 5, color: 'grey' }}>
{item.phoneNumbers && item.phoneNumbers[0] && item.phoneNumbers[0].number}
</Text>
</View>
<View style={{ flex: 1, borderTopWidth: 0.5, borderTopColor: 'grey' }}>
{itemChecked.includes(item.phoneNumbers[0].digits) === false ? (
<CheckBox
style={{ width: 15, height: 15 }}
right={true}
checked={false}
onPress={() => {
onChangeValue(item, index);
}}
/>
) : (
<CheckBox
style={{ width: 15, height: 15, paddingTop: 8 }}
right={true}
checked={true}
onPress={() => {
onChangeValue(item, index);
}}
/>
)}
</View>
{/* <Post postJson={item} isGroupAdmin={isGroupAdmin} user={user} /> */}
</TouchableOpacity>
</ScrollView>
</SafeAreaView>
);
};
return (
<SafeAreaView style={styles.container}>
<View style={styles.container}>
<View
style={{
height: 40,
justifyContent: 'center',
backgroundColor: '#eeeeee',
width: '90%',
marginHorizontal: 20,
marginTop: 15,
borderRadius: 10,
}}
>
<Feather name="search" size={20} color="grey" style={{ position: 'absolute', left: 32 }} />
<TextInput
placeholder="Search"
placeholderTextColor="#949494"
style={{
left: 20,
paddingHorizontal: 35,
fontSize: 20,
}}
value={search}
onChangeText={(text) => {
searchFilter(text);
setSearch(text);
}}
/>
</View>
<FlatList
style={{ marginTop: 15 }}
data={contacts && filter}
keyExtractor={(item) => `key-${item.id.toString()}`}
renderItem={renderItem}
refreshing={true}
initialNumToRender={10}
ListEmptyComponent={<Text message="No contacts found." />}
/>
</View>
</SafeAreaView>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff',
},
});
export default ContactList;

Unable to change state of Modal Reactnative

Code:
import React, { Component,useState } from 'react';
import {
StyleSheet,
View,
TouchableHighlight,
Text,
ToastAndroid,
ScrollView,
Modal,Button
} from 'react-native';
import ProgressCircle from 'react-native-progress-circle'
import AutoTags from 'react-native-tag-autocomplete';
import firebase from '../config';
import { TabView, SceneMap } from 'react-native-tab-view';
const db= firebase.database();
let itemsRef = db.ref('/dataset');
let input = db.ref('/tags');
let disease=[];
itemsRef.limitToFirst(10).on('value', (snapshot) => {
snapshot.forEach((childSnapshot) => {
disease.push(childSnapshot.val().Disease);
});
});
let addItem = item => {
input.push({
userSymptom: item
});
};
export default class App extends React.Component {
constructor(props) {
super(props);
this.state = {
tagsSelected:[],
storedTags:[],
index: 0,
routes: [
{ key: 'first', title: 'First' },
{ key: 'second', title: 'Second' },
{ key: 'third', title: 'Third'}],
modalVisible: false,
};
}
componentDidMount(){
let storedTags=[];
itemsRef.on('value', (snapshot) => {
snapshot.forEach((childSnapshot) => {
storedTags.push({'name':childSnapshot.val().Symptom});
});
});
let userSymptoms=[];
input.limitToLast(1).on('value', (snapshot)=>{
snapshot.forEach((childSnapshot)=>{
childSnapshot.val().userSymptom.forEach(element=>{
userSymptoms.push(element)
})
})
})
this.setState({ tagsSelected:userSymptoms})
this.setState({ storedTags: storedTags})
}
setModalVisible(visible){
this.setState({ modalVisible: visible });
}
Modal=()=>(
<View style={styles.centeredView}>
<Modal
animationType="slide"
transparent={true}
visible={this.state.modalVisible}
onRequestClose={() => {
console.log("Modal has been closed.");
}}
>
<View style={styles.centeredView}>
<View style={styles.modalView}>
<Text style={styles.modalText}>Hello World!</Text>
<TouchableHighlight
style={{ ...styles.openButton, backgroundColor: "#2196F3" }}
onPress={() => {
this.setModalVisible(!this.state.modalVisible);
}}
>
<Text style={styles.textStyle}>Hide Modal</Text>
</TouchableHighlight>
</View>
</View>
</Modal>
</View>
);
FirstRoute = () => (
<ScrollView style={[styles.container, { backgroundColor: '#ff4081' }]} >
{this.Modal()}
<TouchableHighlight style={styles.back} onPress={() => {
this.setModalVisible(true);
console.log('Pressed')
}}>
<View style={styles.DisEntry}>
<Text style={styles.text}>{disease[0]}</Text>
<ProgressCircle
percent={30}
radius={50}
borderWidth={8}
color="#3399FF"
shadowColor="#999"
bgColor="#fff"
>
<Text style={{ fontSize: 18 }}>{'30%'}</Text>
</ProgressCircle>
</View>
</TouchableHighlight>
</ScrollView>
);
SecondRoute = () => (
<View style={[styles.container, { backgroundColor: '#673ab7' }]}>
</View>
);
ThirdRoute = () => (
<View style={[styles.container, { backgroundColor: '#673ab7' }]}>
</View>
);
handleSubmit = () => {
addItem(this.state.tagsSelected);
ToastAndroid.show('Symptoms saved successfully', ToastAndroid.SHORT)
};
handleDelete = index => {
let tagsSelected = this.state.tagsSelected;
tagsSelected.splice(index, 1);
this.setState({ tagsSelected });
}
handleAddition = suggestion => {
this.setState({ tagsSelected: this.state.tagsSelected.concat([suggestion]) });
}
_handleIndexChange = index => this.setState({ index });
_renderScene = SceneMap({
first: this.FirstRoute,
second: this.SecondRoute,
third: this.ThirdRoute,
});
render() {
return (
<View style={styles.container}>
<View style={styles.row}>
<View style={styles.autocompleteContainer}>
<AutoTags
suggestions={this.state.storedTags}
tagsSelected={this.state.tagsSelected}
handleAddition={this.handleAddition}
handleDelete={this.handleDelete}
placeholder="Add a Symptom.." />
</View>
<TouchableHighlight
style={styles.button}
underlayColor="blue"
onPress={this.handleSubmit}>
<Text style={styles.buttonText}>Add</Text>
</TouchableHighlight>
</View>
<TabView
style={styles.tab}
navigationState={this.state}
renderScene={this._renderScene}
renderTabBar={this._renderTabBar}
onIndexChange={this._handleIndexChange}
/>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex:1,
},
row:{
flexDirection:"row"
},
DisEntry:{
flexDirection:"row",
backgroundColor:'white',
borderColor: 'black',
borderWidth: 1,
borderRadius: 5,
padding: 2,
},
back:{
backgroundColor: 'blue'
},
text:{
flex:1,
},
button:{
flex:0,
backgroundColor:'white',
borderColor: 'black',
borderWidth: 1,
borderRadius: 5,
padding: 2,
justifyContent:'flex-end',
height:30,
justifyContent:'center',
},
autocompleteContainer: {
flex:1,
justifyContent:'flex-start',
marginBottom:10
},
tab:{
flex:1,
},
centeredView: {
flex: 1,
justifyContent: "center",
alignItems: "center",
marginTop: 22
},
modalView: {
margin: 20,
backgroundColor: "white",
borderRadius: 20,
padding: 35,
alignItems: "center",
shadowColor: "#000",
shadowOffset: {
width: 0,
height: 2
},
shadowOpacity: 0.25,
shadowRadius: 3.84,
elevation: 5
},
openButton: {
backgroundColor: "#F194FF",
borderRadius: 20,
padding: 10,
elevation: 2
},
textStyle: {
color: "white",
fontWeight: "bold",
textAlign: "center"
},
modalText: {
marginBottom: 15,
textAlign: "center"
}
});
I am facing the problem that i am unable to toggle the Modal visibility when i click the touchable highlight. Please tell me where is the issue in my code as when i change the state of my modalVisible to true the modal shows finely
.....................................................................................................
If i'm not mistaken Modal has to be inside of return()
class App extends Component {
state = {
modalVisible: false
};
setModalVisible = (visible) => {
this.setState({ modalVisible: visible });
}
render() {
const { modalVisible } = this.state;
return (
<View style={styles.centeredView}>
<Modal
animationType="slide"
transparent={true}
visible={modalVisible}
onRequestClose={() => {
Alert.alert("Modal has been closed.");
}}
>
<View style={styles.centeredView}>
<View style={styles.modalView}>
<Text style={styles.modalText}>Hello World!</Text>
<TouchableHighlight
style={{ ...styles.openButton, backgroundColor: "#2196F3" }}
onPress={() => {
this.setModalVisible(!modalVisible);
}}
>
<Text style={styles.textStyle}>Hide Modal</Text>
</TouchableHighlight>
</View>
</View>
</Modal>
<TouchableHighlight
style={styles.openButton}
onPress={() => {
this.setModalVisible(true);
}}
>
<Text style={styles.textStyle}>Show Modal</Text>
</TouchableHighlight>
</View>
);
}
}

How to create dynamic checkbox in react native

I am able to create the dynamic checkbox but i need to check and uncheck it separately, right now if i check one everything gets checked and if i uncheck everything gets unchecked.
How to change the value of checkbox separately for each checkbox from state?
import React from 'react';
import {View,Text,StyleSheet,TouchableOpacity,Image,Switch,Platform,Dimensions,PixelRatio,} from'react-native';
import ImagePicker from 'react-native-image-picker';
import { Input, Button } from 'react-native-elements';
import { moderateScale } from 'react-native-size-matters';
const deviceWidth = Dimensions.get('window').width;
const deviceHeight = Dimensions.get('window').height;
const calcHeight = x => PixelRatio.roundToNearestPixel((deviceHeight * x) / 100);
const calcWidth = x => PixelRatio.roundToNearestPixel((deviceWidth * x) / 100);
class ErrorScreen extends React.Component {
constructor() {
super();
this.state = {
arr: [],
parkPay: false,
itemChecked: false,
index: null,
};
}
functionTwo = () => {
alert('func 2');
this.setState(() => ({
parkPay: true,
}));
};
checkedItem = index => {
console.log('this is index', index);
// let itemChecked = this.state.itemChecked
if (this.state.index != index) {
this.setState(() => ({
index: index,
itemChecked: !this.state.itemChecked,
}));
}
};
addParkField = () => {
console.log('jjjjj');
console.log(' ^^ props in parking form ^^ ', this.props);
let x = 0;
this.setState(() => ({
arr: [...this.state.arr, ''],
}));
// this.addFieldSecond()
// this.props.addParkFieldSecond()
};
render() {
return (
<View>
<View
style={{flex: 1, paddingRight: calcWidth(4),paddingLeft: calcWidth(6), paddingTop: calcHeight(4),paddingBottom: calcHeight(4),
}}>
<Input
placeholder="Enter Amount"
label="Enter Amount"
labelStyle={{ fontWeight: '200', color: 'black' }}
inputContainerStyle={{
paddingRight: calcWidth(2),
paddingLeft: calcWidth(2),
paddingTop: calcHeight(1),
paddingBottom: calcHeight(1),
}}
// onChangeText={this.props.parkingAmount}
/>
<Text style={[styles.error]}>{this.state.errors.Amount}</Text>
<View
style={{ paddingLeft: calcWidth(2), paddingTop: calcHeight(4) }}>
<View style={{ paddingRight: calcWidth(70) }}>
<Switch
value={this.state.parkPay}
style={
Platform.OS === 'ios' ? styles.switchIOS : styles.switchAND
}
// onValueChange={(value) => {this.props.toggleCustomerParkingPay(value); this.functionTwo()}}
/>
</View>
<Text style={{ paddingTop: calcHeight(8) }}>Paid By Customer</Text>
</View>
</View>
<View style={{}}>
{this.state.arr.map((extra, index) => {
return (
<View
style={{
flex: 1,
paddingRight: calcWidth(4),
paddingLeft: calcWidth(20),
paddingTop: calcHeight(15),
paddingBottom: calcHeight(4),
}}
key={index}>
<Input
placeholder="Enter Amount"
label="Enter Amount"
labelStyle={{ fontWeight: '200', color: 'black' }}
inputContainerStyle={{
paddingRight: calcWidth(2),
paddingLeft: calcWidth(2),
paddingTop: calcHeight(1),
paddingBottom: calcHeight(1),
}}
// onChangeText={this.handleAmount}
// onChangeText={this.props.parkingAmount}
/>
<Text style={[styles.error]}>{this.state.errors.Amount}</Text>
<View style={{ paddingTop: calcHeight(4) }}>
<View style={{ paddingRight: calcWidth(70) }}>
<Switch
value={this.state.parkPay}
style={
Platform.OS === 'ios'
? styles.switchIOS
: styles.switchAND
}
// onValueChange={(value) => {this.props.toggleCustomerParkingPay(value);}}
/>
</View>
<Text style={{ paddingTop: calcHeight(8) }}>
Paid By Customer
</Text>
</View>
</View>
);
})}
<View>
<View
style={{ paddingLeft: calcWidth(60), paddingTop: calcHeight(2) }}>
<TouchableOpacity
style={[styles.cardCirclePassenger]}
onPress={this.addParkField}>
<View
style={{
justifyContent: 'center',
alignItems: 'center',
paddingTop: calcHeight(2.2),
}}>
{/* <Image
style={{width: 24, height: 24}}
source={require('../../images/Group424.png')}
/> */}
<Text>Add</Text>
</View>
</TouchableOpacity>
</View>
</View>
</View>
</View>
);
}
}
const styles = StyleSheet.create({
cardCirclePassenger: {
backgroundColor: '#31588A',
marginBottom: 10,
marginLeft: '5%',
width: 60,
height: 60,
borderRadius: 60 / 2,
borderColor: 'white',
shadowOpacity: 0.2,
shadowRadius: 1,
shadowOffset: {
width: 3,
height: 3,
},
borderWidth: 1,
},
switchIOS: {
transform: [
{ scaleX: moderateScale(0.7, 0.2) },
{ scaleY: moderateScale(0.7, 0.2) },
],
},
switchAND: {
transform: [
{ scaleX: moderateScale(1, 0.2) },
{ scaleY: moderateScale(1, 0.2) },
],
},
});
export default ErrorScreen;
i worked around a little bit and found the below way to generate dynamic checboxes along with separate state values. hope this helps someone.
The below code creates dynamic key-value pairs in state. if you console.log the state in your render you'll see (check0:true check1:true check2: false ....) .
<Switch
value={this.state[`check${key}`]}
onValueChange={value => this.setState({ [`check${key}`]: value })}
/>

Use swiper to render profiles in react-native

Hi I have a Home component where I've got a flatlist showing all the users of my application with some infos like the pseudo, their age etc. When we click on a user, it will go to an another component, UserProfil where we can have more infos about the user. I want to implements a swiper that will let me swipe between the users. How can I use my data from Home component in UserProfil in order to start the swiper?
Here are my components :
Home.js
class Accueil extends React.Component {
constructor(props) {
super(props);
this.state = {
loading: false,
refreshing: false,
location: null,
latitude:null,
longitude:null,
dataSource:[],
error:null
}
setInterval(this.displayPosition.bind(this),3000)
this.displayPosition = this.displayPosition.bind(this);
}
getData(){
fetch("someURL")
.then(res => res.json())
.then(res => {
this.setState({
dataSource: res
});
})
.catch(error => {
console.log("get data error:" + error);
}),
{
method: 'POST',
headers: {
Accept: 'application/json',
'Content-Type': 'application/json',
},
body: JSON.stringify({
lo: this.state.longitude,
la: this.state.latitude,
}),
}
}
_displayDetailForUser = (idUser, name, photo, age, pratique, description, distance, Statut, localisation, principale ) => {
//console.log("Display user with id " + idUser);
this.props.navigation.navigate("UserProfil", { MembreId: idUser, Pseudo:name, Photo: photo, Age:age, Genre:pratique, Description:description, Distance:distance, Statut:Statut, CP:localisation, Ville:principale });
}
render() {
return (
<SafeAreaView style={{ flex:1 }}>
<View style={styles.main_container}>
<FlatList style={styles.flatList}
data={this.state.dataSource}
extraData = {this.state}
keyExtractor={(item, index) => item.MembreId}
renderItem={(item) => <UserItem user={item} displayDetailForUser={this._displayDetailForUser} />}
numColumns={numColumns}
refreshing={this.state.refreshing}
onRefresh={this.handleRefresh} />
</View>
</SafeAreaView>
)
}
}
and UserProfil
render () {
const { user } = this.props;
var colorConnected;
if (this.props.navigation.getParam('Statut') === "ON") {
colorConnected = "#1fbc26";
}
else if (this.props.navigation.getParam('Statut') === "OFF") {
colorConnected = "#ff0303";
}
else {
colorConnected = "#ffd200";
}
return (
<Swiper showsPagination={false}>
<ScrollView style = {styles.view_container}>
<View style={styles.photo}>
<ImageBackground source={{uri:this.props.navigation.getParam('Photo')}} style={{ width: '100%', height: '100%' }}>
<View style={styles.photo_content}>
<LinearGradient colors={['transparent', 'rgba(0,0,0,0.5)']} style={{ position: 'absolute', left: 0, right: 0, bottom: 0, height: 80 }} />
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<View>
<Text style={{ fontSize: 40, color:'white' }}>{this.props.navigation.getParam('Age')}</Text>
</View>
<View style={{ marginRight: 7, marginLeft: 7, backgroundColor: '#ffffff', width: 1, height: 39 }}></View>
<View style={{ flexDirection: 'column', flex:1 }}>
<View style={{ flexDirection: 'row' }}>
<View style={[styles.bulle_presence, { backgroundColor: colorConnected } ]}></View>
<Text style={{ fontSize: 18, fontWeight: '600', color:'white' }}>{this.props.navigation.getParam('Pseudo')}</Text>
</View>
<View style={{ flexDirection: 'row', justifyContent: 'space-between'}}>
<Text style={{ fontSize: 15, color:'white' }}>{this.props.navigation.getParam('Distance')}</Text>
<Text style={{ fontSize: 15, color:'white'}}>{this.props.navigation.getParam('Genre')}</Text>
</View>
</View>
</View>
</View>
</ImageBackgroud>
</View>
</ScrollView>
</Swiper>
)}
}

can not use delete functionality in flatlist renderItem

Delete functionality is not working in flatlist renderItem method, but it will work perfectly fine if I use map function to render data instead of flatlsit.
Here is the sample code
class App extends Component {
state = {
todos: [
{ todo: 'go to gym', id: 1 },
{ todo: 'buy a mouse', id: 2 },
{ todo: 'practice hash table', id: 3 },
{ todo: 'iron clothes', id: 4 }
]
};
keyExtractor = item => item.id.toString();
handleDelete = id => {
const todos = this.state.todos.filter(item => item.id !== id);
this.setState({ todos });
};
renderItems({ item }) {
return (
<View
style={{
display: 'flex',
flexDirection: 'row',
justifyContent: 'space-between'
}}
>
<Text style={{ fontSize: 16 }}>{item.todo}</Text>
<TouchableOpacity
onPress={() => this.handleDelete(item.id)}
style={{ marginRight: 15 }}
>
<Text style={{ color: 'red' }}>Delete</Text>
</TouchableOpacity>
</View>
);
}
render() {
return (
<View>
{/* {this.renderItems()} */}
<FlatList
data={this.state.todos}
keyExtractor={this.keyExtractor}
renderItem={this.renderItems}
/>
</View>
);
}
}
I can't understand the reason it gives me the error _this2.handleDelete is not a function.
You were not binding your function, in your constructor bind the function or use array function
renderItems = ({ item }) => {
return (
<View
style={{
display: 'flex',
flexDirection: 'row',
justifyContent: 'space-between',
}}>
<Text style={{ fontSize: 16 }}>{item.todo}</Text>
<TouchableOpacity
onPress={() => this.handleDelete(item.id)}
style={{ marginRight: 15 }}>
<Text style={{ color: 'red' }}>Delete</Text>
</TouchableOpacity>
</View>
);
}