How to access mock data array inside FlatList react native - react-native

export const Artists = [
{
name: "Breakbot",
songs: [
{
title: "Star Tripper",
album: "Still Waters",
},
{
title: "You Should Know (feat. Ruckazoid)",
album: "Still Waters",
},
]
},]
Above is mock data array which is defined in another file. And I have declared flatlist in another file.

SmapleScreen.js
import React, { Component } from 'react'
import { Text, View, FlatList, TouchableOpacity, RefreshControl } from 'react-native'
import { connect } from 'react-redux'
// Add Actions - replace 'Your' with whatever your reducer is called :)
import Icon from 'react-native-vector-icons/MaterialIcons';
import { Fonts, Colors, Images, Metrics } from '../Themes'
import MockData from "./mockData"
// Styles
import styles from './Styles/OrdersScreenStyle'
class SampleScreen extends Component {
constructor(props) {
super(props);
this.state = {
}
}
componentWillMount() {
}
render() {
// console.log(this.props.order_details.new_orders,'refreshed' )
return (
(this.props.order_details.new_orders == null || this.props.order_details.new_orders.length == 0) ?
<View style={{ flex: 1, justifyContent: "center", backgroundColor: Colors.snow }}>
<Text style={{ alignSelf: 'center' }}>
You do not have any orders.
</Text>
</View>
:
<View style={{ flex: 1, flexDirection: 'column', justifyContent: "flex-start" }}>
<View style={{ padding: 10, flexDirection: 'row' }}>
<Text style={{ flex: 3 }}>Scheme</Text>
<Text style={{ flex: 2 }}>Amount</Text>
</View >
<FlatList
style={styles.container}
data={MockData}
keyExtractor={(item, index) => index}
renderItem={(item) => this.getOrderComponent(item)}
/>
<View>
<PrimaryButton label="Make Payment"
disabled={this.props.submitFetching} fetching={this.props.submitFetching} onPress={this.onMakePaymentClick} />
</View >
</View>
)
}
getOrderComponent=(item)=>{
return (
<View>
<Text>{item.name}</Text>
</View>
)
}
}
const mapStateToProps = (state, ownProps) => {
return {
}
}
const mapDispatchToProps = (dispatch) => ({
})
export default connect(mapStateToProps, mapDispatchToProps)(SmapleScreen)
MockData.js
const data =[
{
name: "Breakbot",
songs: [
{
title: "Star Tripper",
album: "Still Waters",
},
{
title: "You Should Know (feat. Ruckazoid)",
album: "Still Waters",
},
]
},
]
export default data

Related

How to use Redux in my React native Application

Here Home.js is Shows the both screen names
And Here Student.js screen is show only student contact numbers and Teacher.js
This is my full code..
And I have used navigation version 4
Navigation.js
import { createAppContainer } from 'react-navigation'
import { createStackNavigator } from 'react-navigation-stack'
import Home from '../screens/Home'
import Teacher from '../screens/Teacher'
import Student from '../screens/Student'
const StackNavigator = createStackNavigator(
{
Student: {
screen: Student
},
Home: {
screen: Home
},
Teacher: {
screen: Teacher
}
},
{
initialRouteName: 'Home',
headerMode: 'none',
mode: 'modal'
}
)
export default createAppContainer(StackNavigator)
Home.js
import React from 'react';
import { Text, View, TouchableOpacity, StyleSheet } from 'react-native';
export default class Home extends React.Component {
render() {
return (
<View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
<Text style={{ marginTop: 50, fontSize: 25 }}>Home!</Text>
<View
style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
<TouchableOpacity
style={styles.button}
onPress={() => this.props.navigation.navigate('Teacher')}>
<Text>Teacher Numbers</Text>
</TouchableOpacity>
<TouchableOpacity
style={styles.button}
onPress={() => this.props.navigation.navigate('Student')}>
<Text>Student Numbers</Text>
</TouchableOpacity>
</View>
</View>
);
}
}
const styles = StyleSheet.create({
button: {
alignItems: 'center',
backgroundColor: '#DDDDDD',
padding: 10,
width: 300,
marginTop: 16,
},
});
Student.js
import React, { useState } from 'react'
import { StyleSheet, View, Button, FlatList } from 'react-native'
import { Text, FAB, List, IconButton, Colors, TextInput } from 'react-native-paper'
import { useSelector, useDispatch } from 'react-redux'
import { addnumber, deletenumber } from './../store/actions/studentList'
import Header from '../components/Header'
function StudentNumber({ navigation }) {
const [studentNumber, setStudentNumber] = useState('')
const snumbers = useSelector(state => state)
const dispatch = useDispatch()
const addNumber = number => dispatch(adbnumber(number))
const deleteNumber = id => dispatch(deletenumber(id))
function onSaveNumber() {
addNumber({studentNumber})
}
function FlatListItemSeparator () {
return (
//Item Separator
<View style={{height: 0.5, width: '100%', backgroundColor: '#C8C8C8'}}/>
);
};
function GetItem(item) {
//Function for click on an item
Alert.alert(item);
}
return (
<>
<View style={styles.container}>
<Button title="Go back" onPress={() => navigation.goBack()} />
<TextInput
label='Add a Number Here'
value={studentNumber}
mode='outlined'
onChangeText={setStudentNumber}
style={styles.title}
/>
{bnumbers.length === 0 ? (
<View style={styles.titleContainer}>
<Text style={styles.title}>You do not have any student numbers</Text>
</View>
) : (
<FlatList
data={snumbers}
ItemSeparatorComponent={FlatListItemSeparator}
renderItem={({ item }) => (
<List.Item
title={item.number.studentNumber}
descriptionNumberOfLines={1}
titleStyle={styles.listTitle}
onPress={() => deletestudentNumber(item.bid)}
/>
)}
keyExtractor={item => item.id.toString()}
/>
)}
<FAB
style={styles.fab}
small
icon='plus'
label='Add new number'
onPress={() => onSaveNumber()}
/>
</View>
</>
)
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff',
paddingHorizontal: 10,
paddingVertical: 20
},
titleContainer: {
alignItems: 'center',
justifyContent: 'center',
flex: 1
},
title: {
fontSize: 20
},
fab: {
position: 'absolute',
margin: 20,
right: 0,
bottom: 10
},
listTitle: {
fontSize: 20
}
})
export default Student
Teacher.js
import React, { useState } from 'react'
import { StyleSheet, View, Button, FlatList } from 'react-native'
import { Text, FAB, List, IconButton, Colors, TextInput } from 'react-native-paper'
import { useSelector, useDispatch } from 'react-redux'
import { addnumber, deletenumber } from './../store/actions/teacherList'
import Header from '../components/Header'
function Teacher({ navigation }) {
const [teacherNumber, setTeacherNumber] = useState('')
const numbers = useSelector(state => state)
const dispatch = useDispatch()
const addNumber = number => dispatch(addnumber(number))
const deleteNumber = id => dispatch(deletenumber(id))
function onSaveNumber() {
addNumber({ teacherNumber})
}
function FlatListItemSeparator () {
return (
//Item Separator
<View style={{height: 0.5, width: '100%', backgroundColor: '#C8C8C8'}}/>
);
};
function GetItem(item) {
//Function for click on an item
Alert.alert(item);
}
return (
<>
<View style={styles.container}>
<Button title="Go back" onPress={() => navigation.goBack()} />
<TextInput
label='Add a Number Here'
value={teacherNumber}
mode='outlined'
onChangeText={setTeacherNumber}
style={styles.title}
/>
{numbers.length === 0 ? (
<View style={styles.titleContainer}>
<Text style={styles.title}>You do not have any teacher numbers</Text>
</View>
) : (
<FlatList
data={numbers}
ItemSeparatorComponent={FlatListItemSeparator}
renderItem={({ item }) => (
<List.Item
title={item.number.teacherNumber}
descriptionNumberOfLines={1}
titleStyle={styles.listTitle}
onPress={() => deleteNumber(item.id)}
/>
)}
keyExtractor={item => item.id.toString()}
/>
)}
<FAB
style={styles.fab}
small
icon='plus'
label='Add new number'
onPress={() => onSaveNumber()}
/>
</View>
</>
)
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff',
paddingHorizontal: 10,
paddingVertical: 20
},
titleContainer: {
alignItems: 'center',
justifyContent: 'center',
flex: 1
},
title: {
fontSize: 20
},
fab: {
position: 'absolute',
margin: 20,
right: 0,
bottom: 10
},
listTitle: {
fontSize: 20
}
})
export default Teacher
studentStore.js
import { createStore } from 'redux'
import studentReducer from '../actions/studentList'
const studentStore = createStore(studentReducer)
export default studentStore
teacherStore.js
import { createStore } from 'redux'
import teacherReducer from '../actions/teacherList'
const teacherStore = createStore(teacherReducer)
export default teacherStore
teacherReducer.js
import remove from 'lodash.remove'
export const ADD_NUMBER = 'ADD_NUMBER'
export const DELETE_NUMBER = 'DELETE_NUMBER'
let numberID = 0
export function addnumber(number) {
return {
type: ADD_NUMBER,
id: numberID++,
number
}
}
export function deletenumber(id) {
return {
type: DELETE_NUMBER,
payload: id
}
}
const initialState = []
function teacherReducer(state = initialState, action) {
switch (action.type) {
case ADD_NUMBER:
return [
...state,
{
id: action.id,
number: action.number
}
]
case DELETE_NUMBER:
const deletedNewArray = remove(state, obj => {
return obj.id != action.payload
})
return deletedNewArray
default:
return state
}
}
export default teacherReducer
studetnReducer.js
import remove from 'lodash.remove'
export const ADD_NUMBER = 'ADD_NUMBER'
export const DELETE_NUMBER = 'DELETE_NUMBER'
let numberID = 0
export function addnumber(number) {
return {
type: ADD_NUMBER,
id: numberID++,
number
}
}
export function deletenumber(id) {
return {
type: DELETE_NUMBER,
payload: id
}
}
const initialState = []
function studentReducer(state = initialState, action) {
switch (action.type) {
case ADD_NUMBER:
return [
...state,
{
id: action.id,
number: action.number
}
]
case DELETE_NUMBER:
const deletedNewArray = remove(state, obj => {
return obj.id != action.payload
})
return deletedNewArray
default:
return state
}
}
export default studentReducer
I Have tried this but is working only for Teachers not for both..

Results do not update after a change of state

I have a problem, when I do a search, I get the data from my API, the first time I do a search, everything is fine, all the data is displayed. However, when I do a second search immediately, nothing is updated.
I put in console.log, and I see that I'm getting this data back, yet the display is not updated.
import React, { Component } from "react";
import { SafeAreaView, StyleSheet } from "react-native";
import Search from "./Component/Search";
export default class App extends Component {
render() {
return (
<SafeAreaView style={styles.container}>
<Search />
</SafeAreaView>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1
}
});
import React from "react";
import { View, TextInput, Button, FlatList, StyleSheet } from "react-native";
import LivreItem from "../Component/LivreItem";
class Search extends React.Component {
constructor(props) {
super(props);
this.inputValue = "";
this.state = { livres: [] };
}
searchBooks = async () => {
const key = "&key=XXXXXXXXXXXXXXXXXXXXXXX";
const url = "https://www.googleapis.com/books/v1/volumes?q=" + this.inputValue + key;
return fetch(url)
.then(response => response.json())
.catch(e => {
console.log("Une erreur s'est produite");
console.log(e);
});
};
getBooks = () => {
if (this.inputValue.length > 0) {
this.searchBooks()
.then(data => this.setState({ livres: data.items }))
.catch(reject => console.log(reject));
}
};
changeText = text => {
this.inputValue = text;
};
render() {
return (
<View style={styles.header_container}>
<View style={styles.sub_container}>
<TextInput
onChangeText={text => this.changeText(text)}
style={styles.input}
placeholder="Ex: Harry Potter"
/>
<Button
style={styles.button}
title="Rechercher"
onPress={() => this.getBooks()}
/>
</View>
<FlatList
style={styles.list}
data={this.state.livres}
keyExtractor={(item, index) => item + index}
renderItem={({ item }) => <LivreItem livre={item.volumeInfo} />}
/>
</View>
);
}
}
const styles = StyleSheet.create({
sub_container: {
justifyContent: "space-between",
flexDirection: "row",
marginTop: 30,
paddingRight: 10,
paddingLeft: 10
},
header_container: {
flex: 1,
flexDirection: "column",
padding: 10
},
input: {
borderRadius: 4,
borderWidth: 0.5,
borderColor: "#d6d7da",
width: 150,
paddingLeft: 5
},
button: {
borderRadius: 4
},
list: {
paddingLeft: 15,
paddingRight: 15
}
});
export default Search;
import React from "react";
import { View, StyleSheet, Image, Text } from "react-native";
class LivreItem extends React.Component {
constructor(props) {
super(props);
this.state = { livre: this.props.livre};
this.description =
this.state.livre.description === null || this.state.livre.description === undefined
? "Pas de description disponible"
: this.state.livre.description;
this.img = this.state.livre.imageLinks;
this.image =
this.img === undefined ||
this.img.smallThumbnail === undefined ||
this.img.smallThumbnail === null
? null
: this.state.livre.imageLinks.smallThumbnail;
}
render() {
return (
<View style={styles.content}>
<View>
<Image style={styles.image} source={{ uri: this.image }} />
<Image style={styles.image} source={this.image} />
</View>
<View style={styles.content_container}>
<Text style={styles.titre}>{this.state.livre.title}</Text>
<Text style={styles.description} numberOfLines={4}>
{this.description}
</Text>
</View>
</View>
);
}
}
const styles = StyleSheet.create({
content: {
height: 125,
flexDirection: "row",
marginTop: 15
},
content_container: {
flexDirection: "column",
flexShrink: 1,
marginLeft: 10
},
image: {
width: 100,
height: 100
},
titre: {
fontWeight: "bold",
flexWrap: "wrap"
},
description: {
flexWrap: "wrap"
}
});
export default LivreItem;
Thanks.
Configure the prop extraData in Flatlist component ala:
<FlatList
extraData={this.state.livres}
/>
Pass a boolean value to the FlatList extraData.
<FlatList
extraData={this.state.refresh}
/>

Flatlist data not showing up on screen

Trying to make a simple to-do list. My AddTodo component works fine and I don't believe it is causing the issue but my Flatlist does not show the data. I have no idea why as there are no errors. The issue appears with or without the scroll view.
I've tried messing around with the width and height of the items and the list itself but nothing seems to do the trick.
my mainTodo file:
import React, { Component } from 'react';
import { Text, View, StyleSheet, FlatList, ScrollView } from 'react-native';
import AddTodo from './AddTodo';
import TodoItem from './TodoItem';
class MainTodo extends Component {
constructor() {
super();
this.state = {
textInput: '',
todos: [
{ id: 0, title: 'walk rocky', completed: false },
{ id: 1, title: 'pickup dinner', completed: false }
]
};
}
addNewTodo() {
let todos = this.state.todos;
todos.unshift({
id: todos.length + 1,
todo: this.state.textInput,
completed: false
});
this.setState({
todos,
textInput: ''
});
}
render() {
return (
<View style={{ flex: 1 }}>
<AddTodo
textChange={textInput => this.setState({ textInput })}
addNewTodo={() => this.addNewTodo()}
textInput={this.state.textInput}
/>
<ScrollView>
<FlatList
style={{ flex: 1 }}
data={this.state.todos}
extraData={this.state}
keyExtractor={(item, index) => index.toString()}
renderItem={({ item }) => {
return (
<TodoItem todoItem={item} />
);
}}
/>
</ScrollView>
</View>
);
}
}
export default MainTodo;
my TodoItem file:
import React, { Component } from 'react';
import { StyleSheet, Text, TouchableOpacity, View } from 'react-native';
class TodoItem extends Component {
render() {
const todoItem = this.props.todoItem;
return (
<View>
<TouchableOpacity style={styles.todoItem}>
<Text style={(todoItem.completed) ? { color: '#aaaaaa' } : { color: '#313131' }}>
{todoItem.title}
</Text>
</TouchableOpacity>
</View>
);
}
}
const styles = StyleSheet.create({
todoItem: {
width: 40,
height: 40,
borderBottomColor: '#DDD',
borderBottomWidth: 1,
flexDirection: 'row',
alignItems: 'center',
justifyContent: 'space-between',
paddingLeft: 15
}
});
export default TodoItem;
Under my addtodo component nothing shows up, it's just a blank screen.
In the maintodo file you are rendering the AddTodo component but i didn't see your AddTodo component. So you can update your code accordingly.
In the TodoItem remove the style applied to TouchableOpacity so that your code looks like
import React, { Component } from 'react';
import { StyleSheet, Text, TouchableOpacity, View } from 'react-native';
class TodoItem extends Component {
render() {
const todoItem = this.props.todoItem;
return (
<View>
<TouchableOpacity style={styles.todoItem}>
<Text style={(todoItem.completed) ? { color: '#aaaaaa' } : { color: '#313131' }}>
{todoItem.title}
</Text>
</TouchableOpacity>
</View>
);
}
}
const styles = StyleSheet.create({
});
export default TodoItem;
And in the MainTodo
update your addNewTodo function as
addNewTodo = () => {
const todo = {
id: this.state.todos.length,
title: this.state.textInput,
completed: false
}
this.setState({todos: [...this.state.todos, todo ], textInput: ""})
}
create the TextInput and Button with parent View as flexDirection: "row" and so when TextInput is changed it's value is set in the textInput and when Button is pressed it will create new object and add it to the todos and set the value of TextInput to empty.
and final code can be as
import React, { Component } from 'react';
import { Text, View, StyleSheet, FlatList, ScrollView, TextInput, Button } from 'react-native';
import TodoItem from './TodoItem';
class MainTodo extends Component {
constructor() {
super();
this.state = {
textInput: '',
todos: [
{ id: 0, title: 'walk rocky', completed: false },
{ id: 1, title: 'pickup dinner', completed: false }
]
};
}
addNewTodo = () => {
const todo = {
id: this.state.todos.length,
title: this.state.textInput,
completed: false
}
this.setState({todos: [...this.state.todos, todo ], textInput: ""})
}
render() {
return (
<View style={{ flex: 1, marginTop: 30, paddingHorizontal: 20 }}>
<View style={{flexDirection: "row", alignItems: "center", justifyContent: "space-between"}}>
<TextInput style={{borderWidth: 1, borderColor: "black"}} onChangeText={textInput => this.setState({textInput})} placeholder="Enter todo text" value={this.state.textInput} />
<Button onPress={this.addNewTodo} title="Add todo" />
</View>
<FlatList
contentContainerStyle={{flexGrow: 1}}
data={this.state.todos}
extraData={this.state.todos}
keyExtractor={(item, index) => index.toString()}
renderItem={({ item }) => {
return (
<TodoItem todoItem={item} />
);
}}
/>
</View>
);
}
}
export default MainTodo;
use the code
mainTodo file:
import React, { Component } from 'react';
import { Text, View, StyleSheet, FlatList, ScrollView } from 'react-native';
import AddTodo from './AddTodo';
import TodoItem from './TodoItem';
class MainTodo extends Component {
constructor() {
super();
this.state = {
textInput: '',
todos: [
{ id: 0, title: 'walk rocky', completed: false },
{ id: 1, title: 'pickup dinner', completed: false }
]
};
}
addNewTodo() {
let todos = this.state.todos;
todos.unshift({
id: todos.length + 1,
todo: this.state.textInput,
completed: false
});
this.setState({
todos,
textInput: ''
});
}
render() {
return (
<View style={{ flex: 1 }}>
<AddTodo
textChange={textInput => this.setState({ textInput })}
addNewTodo={() => this.addNewTodo()}
textInput={this.state.textInput}
/>
<ScrollView>
<FlatList
style={{ flex: 1 }}
data={this.state.todos}
extraData={this.state}
keyExtractor={(item, index) => index.toString()}
renderItem={({ item }) => {
return (
<TodoItem todoItem={item} />
);
}}
/>
</ScrollView>
</View>
);
}
}
export default MainTodo;
TodoItem file:
import React, { Component } from 'react';
import { StyleSheet, Text, TouchableOpacity, View } from 'react-native';
class TodoItem extends Component {
render() {
const todoItem = this.props.todoItem;
return (
<View>
<TouchableOpacity style={styles.todoItem}>
<Text style={(todoItem.completed) ? { color: '#aaaaaa' } : { color: '#313131' }}>
{todoItem.title}
</Text>
</TouchableOpacity>
</View>
);
}
}
const styles = StyleSheet.create({
todoItem: {
width: 40,
height: 40,
borderBottomColor: '#DDD',
borderBottomWidth: 1,
backgroundColor:'red',
flexDirection: 'row',
alignItems: 'center',
justifyContent: 'space-between',
paddingLeft: 15
}
});
export default TodoItem;

Blank Screen with react-native navigation with no error code

Please, look at the debugger and the screen for what could be a problem. However, the code is highly displayed below for your perusal.
More also, I aimed at navigating to another page based on the id of the selected content.
App.js
The App.js is where I defined my stackNavigator
import React, {Component} from 'react';
import { StyleSheet, Text, View} from 'react-native';
import Post from './components/Post';
import PostSingle from './components/PostSingle';
import { createStackNavigator, createAppContainer } from 'react-navigation';
const RootStack = createStackNavigator(
{
PostScreen: { screen: Post},
PostSingleScreen:{screen: PostSingle},
},
{
initialRouteName: "PostScreen"
}
);
const AppNavigator = createAppContainer(RootStack);
export default class App extends Component {
constructor(props) {
super(props);
};
render() {
return (
<View style={styles.container}>
<AppNavigator/>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
backgroundColor: '#F3F3F3',
}
});
Post.js
I have tried to delete alignItem = center. In fact I deleted my style to see if there is any blocking the screen from coming up.
import React, { Component } from 'react';
import {
ScrollView,
StyleSheet,
View,
Text,
InputText,
TouchableOpacity
} from 'react-native';
import axios from 'axios';
export default class Post extends Component{
constructor(props){
super(props);
this.state = {
posts: []
}
}
readMore = () => {
()=> this.props.navigation.navigate('PostSingleScreen');
debugger;
}
componentDidMount(){
axios.get(`http://localhost/rest_api_myblog/api/post/read.php`)
//.then(json => console.log(json.data.data[0].id))
.then(json => json.data.data.map(mydata =>(
{
title: mydata.title,
body: mydata.body,
author: mydata.author,
category_name: mydata.category_name,
id: mydata.id
}
)))
//.then(newData => console.log(newData))
.then(newData => this.setState({posts: newData}))
.catch(error => alert(error))
}
render(){
return (
<View>
<ScrollView style={styles.scrollContent}>
<View style={styles.header}>
<Text style={styles.headerText}>Gist Monger</Text>
</View>
{
this.state.posts.map((post, index) =>(
<View key={index} style={styles.container}>
<Text style={styles.display}>
Author: {post.author}
</Text>
<Text style={styles.display}>
Category: {post.category_name}
</Text>
<Text style={styles.display}>
Title: {post.title}
</Text>
<Text style={{overflow:'hidden'}}>
Id: {post.id}
</Text>
<TouchableOpacity style={styles.buttonContainer}
onPress = {() => this.readMore()}
>
<Text style={styles.buttonText}>
Read More
</Text>
</TouchableOpacity>
</View>
))
}
</ScrollView>
<View style={styles.footer}></View>
</View>
);
}
}
const styles = StyleSheet.create({
header: {
flex: 1,
height:40,
marginTop:50,
marginBottom:10,
flexDirection: 'row',
justifyContent:'center',
},
display: {
margin: 3,
fontSize: 16
},
headerText: {
fontWeight: 'bold',
fontSize: 40,
color: '#6200EE'
},
container: {
backgroundColor:'#efefef',
padding: 20,
margin: 5,
borderRadius:20,
justifyContent: 'center',
alignItems: 'center'
},
footer: {
flex: 1,
backgroundColor:'#000',
marginBottom:50
},
buttonContainer:{
height: 30,
width: 200,
marginTop: 15,
justifyContent: 'center',
alignItems: 'center',
borderRadius: 15,
backgroundColor:'#6200EE'
},
buttonText: {
alignContent: 'center',
color: 'white'
}
});
PostSingle.js
import React, { Component } from 'react';
import {
StyleSheet,
View,
Text
} from 'react-native';
import axios from 'axios';
export default class Post extends Component{
constructor(props){
super(props);
}
render(){
return (
<View>
<Text>My text</Text>
</View>
);
}
}
const styles = StyleSheet.create({
});
I did not test this code, but try to add flex: 1 to your container style. the main containers/components don't stretch if you don't tell them to
const styles = StyleSheet.create({
container: {
backgroundColor: '#F3F3F3',
flex: 1,
}
});
also, to check if the components render (helps debugging where the problem is), write a console log in every component's componentDidMount. if they mount, but nothing is visible, it's most likely a CSS issue. If it wasn't, it would throw errors instead of blank screen
second issue is, when you navigate you need to have params with react-navigation. the syntax for it is like this:
this.props.navigation.navigate('PostSingleScreen', { params })
so, if you have { id: someId } in your params, in the component you navigated to you will have {this.props.navigation.state.params.id}. so basically those params are inside navigation.state.params where you navigate
Let me help you with your second question. First, it is easier as said by just specifying params in your navigation.
For instance,
readMore = (id) => {
this.props.navigation.navigate('PostSingleScreen', {id:id})
}
However, in your TouchableOpacity, onPress method i.e. onPress = {() => this.readMore(post.id)}
In your PostSingle.js
import React, { Component } from 'react';
import {
StyleSheet,
View,
Text,
Button
} from 'react-native';
import axios from 'axios';
class PostSingle extends Component{
constructor(props){
super(props);
this.state = {
posts: []
}
}
componentDidMount() {
const id = this.props.navigation.state.params.id;
axios.get(`http://localhost/rest_api_myblog/api/post/read_single.php?id=${id}`)
.then(json => json.data)
.then(newData => this.setState({posts: newData}))
.catch(error => alert(error))
}
render(){
return (
<View style={styles.container}>
<Text style={styles.display}>
{this.state.posts.title}
</Text>
<Text style={styles.display}>
{this.state.posts.author}
</Text>
<Text style={styles.display}>
{this.state.posts.category_name}
</Text>
<Text style={styles.display}>
{this.state.posts.body}
</Text>
</View>
);
}
}
I hope it helps
i would suggest using flaltist for this, and not this.state.map. this should give you the same outcome
readMore(id){
//do whatever you want with the id
this.props.navigation.navigate('PostSingleScreen',{id:id}); //or pass it as a prop
debugger;
}
renderItem = ({ item, index }) => {
return (
<View key={index} style={styles.container}>
<Text style={styles.display}>
Author: {item.author}
</Text>
<Text style={styles.display}>
Category: {item.category_name}
</Text>
<Text style={styles.display}>
Title: {item.title}
</Text>
<Text style={{overflow:'hidden'}}>
Id: {item.id}
</Text>
<TouchableOpacity style={styles.buttonContainer}
onPress = {() => this.readMore(item.id)}
>
<Text style={styles.buttonText}>
Read More
</Text>
</TouchableOpacity>
</View>
);
};
render(){
return (
<View style={{flex:1}}>
<FlatList
style={{flex:1}}
data={this.state.posts}
renderItem={this.renderItem}
numColumns={1}
keyExtractor={(item, index) => item.id} //this needs to be a unique id
ListHeaderComponent = {
<View style={styles.header}>
<Text style={styles.headerText}>Gist Monger</Text>
</View>}
/>
<View style={styles.footer}/>
</View>
);
}
If you are using react-navigation 5.x then it might be possible that you are adding CSS
alignItems: "center"
to your root file i.e. App.js or index.js I just removed it and it starts working for me.

State does not change until the second button press? Adding a call back throws an error "invariant violation: invalid argument passed"

I'm trying to render a Flatlist that contains a store name. Upon clicking the store name, more information about the store should be displayed.
I attempted to change state and then use
{this.renderMoreDetails(item) && this.state.moreDetailsShown}
to get the additional information to appear. However, it was clear via console.log that state was only changed after a second button press.
From what I read in this article 1 and this article 2 it seemed as though I needed a callback function as an additional parameter to my setState().
I tried adding a callback function(probably incorrect, but I'm extremely lost at this point) and only got more errors.
I know that I have access to all of the data from renderItem inside FlatList. How do I make it appear upon click?
import React, { Component } from 'react';
import {
View,
FlatList,
Text,
TouchableWithoutFeedback,
ListView,
ScrollView
} from 'react-native'
import { NavigationActions } from 'react-navigation';
import { Header, Card, CardSection } from '../common';
import Config from '../Config';
export default class Costco extends Component<Props> {
constructor(props) {
super(props);
this.state = {
stores: [],
selectedItem: {id: null},
};
}
componentWillMount() {
const obj = Config.costcoThree;
const costcoArr = Object.values(obj);
this.setState({
stores: costcoArr,
})
}
renderListOfStores() {
return <FlatList
data={this.state.stores}
renderItem={ ({item}) => this.singleStore(item)}
keyExtractor={(item) => item.id}
extraData={this.state.selectedItem} />
}
singleStore(item) {
console.log(this.state.selectedItem.id)
return item.id === this.state.selectedItem.id ?
<TouchableWithoutFeedback
onPress={() => this.selectStore(item)}
>
<View>
<Text>{item.branchName}</Text>
<Text>Opening Time {item.openingTime}</Text>
<Text>Closing Time {item.closingTime}</Text>
<Text>Address {item.dongAddKor}</Text>
</View>
</TouchableWithoutFeedback>
:
<TouchableWithoutFeedback>
<View>
<Text>{item.branchName}</Text>
<Text>Only showing second part</Text>
</View>
</TouchableWithoutFeedback>
}
selectStore(item) {
this.setState({selectedItem: item});
console.log('repssed');
}
render() {
return(
<ScrollView>
<Header headerText="Costco"/>
<Text>hello</Text>
{this.renderListOfStores()}
</ScrollView>
)
}
}
as a workaround you can have a state that maintain your selected item to expand(or something like another view) and then you can use some conditions to work for render your flat list data.
Consider the below code and let me know if you need some more clarification.
import React, { Component } from 'react';
import {
Platform,
StyleSheet,
Text,FlatList,TouchableNativeFeedback,
View
} from 'react-native';
export default class App extends Component<Props> {
constructor(props) {
super(props);
this.state = {
response: [],
selectedItem: {id: null},
};
}
userListLayout() {
const {response} = this.state;
return <FlatList data={response} renderItem={ ({item}) => this.singleUserLayout(item)} keyExtractor={(item) => item.email} extraData={this.state.selectedItem} />
}
singleUserLayout(item) {
return item.id == this.state.selectedItem.id ?
<TouchableNativeFeedback onPress={() => this.userSelected(item)}>
<View style={{flex:1, borderColor: 'black', borderWidth: 1}}>
<Text style={{padding: 10, fontSize: 25}}>{item.email}</Text>
<Text style={{padding: 10,fontSize: 20}}>{item.name}</Text>
</View>
</TouchableNativeFeedback>
: <TouchableNativeFeedback onPress={() => this.userSelected(item)}><Text style={{padding: 10,fontSize: 20}}>{item.email}</Text></TouchableNativeFeedback>
}
userSelected(item) {
console.log(item)
this.setState({selectedItem: item})
}
componentDidMount() {
fetch("https://jsonplaceholder.typicode.com/users")
.then(data => data.json())
.then(response => this.setState({response}))
}
render() {
return (
<View style={styles.container}>
<Text style={styles.welcome}>HI THERE</Text>
{this.userListLayout()}
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
instructions: {
textAlign: 'center',
color: '#333333',
marginBottom: 5,
},
});