i am getting above mentioned error while running my code and have also searched about this error , i do understand the meaning of this error But i am not able to figure it out in my case.
Here is the code for index.android.js file :-
import React, { Component } from 'react';
import {
AppRegistry
} from 'react-native';
import TabNavigatoro from './src/pages/TabNavigatoro';
export default class ReactNewsfeedDemo extends Component {
render() {
return (
<TabNavigatoro/>
);
}
}
AppRegistry.registerComponent('ReactNewsfeedDemo', () => ReactNewsfeedDemo);
Code for TabNavigatoro.js :-
import React, { Component } from 'react';
import {
AppRegistry,
Image
} from 'react-native';
import { Actions, ActionConst } from 'react-native-router-flux';
import logoImg from '../images/logo.png';
import eyeImg from '../images/eye_black.png';
import homeView from './homeView';
import profileView from './profileView';
import TabNavigator from 'react-native-tab-navigator';
export default class TabNavigatoro extends Component {
constructor(props){
super(props);
this.state={selectedTab:'home'}
}
render() {
return (
<TabNavigator selectedTab = {this.state.selectedTab}>
<TabNavigator.Item
selected={this.state.selectedTab === 'home'}
title="Home"
renderIcon={() => <Image source={logoImg} />}
renderSelectedIcon={() => <Image source={logoImg} />}
onPress={() => this.setState({ selectedTab: 'home' })}>
{homeView}
</TabNavigator.Item>
<TabNavigator.Item
selected={this.state.selectedTab === 'profile'}
title="Profile"
renderIcon={() => <Image source={eyeImg} />}
renderSelectedIcon={() => <Image source={eyeImg} />}
onPress={() => this.setState({ selectedTab: 'profile' })}>
{profileView}
</TabNavigator.Item>
</TabNavigator>
);
}
}
Here is homeView.js code :-
import React, { Component } from 'react';
import {
StyleSheet,
Text,
View,
Image,
TouchableOpacity,
TextInput,
} from 'react-native';
export default class homeView extends Component {
render() {
return (
<View style={styles.container} >
<Text style = {styles.description}>
This is Home View , Please click to confirm.
</Text>
</View>
);
}
}
const styles = StyleSheet.create({
container : {
flex:1,
alignSelf : 'stretch',
justifyContent:'center',
},
description : {
fontSize:16,
color: '#ffffff',
textAlign:'center',
},
});
I found one link with same error but it was not answered :-
https://github.com/expo/react-native-tab-navigator/issues/130
please let me know what actually causing problem whey it's no picking {homeView} and {profileView} pages, why it's coming null ?
Appreciate!!!
Related
I am trying to access the props.route.params.data information from the react navigation route prop, however when I try to output it on the screen it just says TypeError: undefined is not an object(evaluating props.routes.params). I know I have correctly followed the path to that data object because I console.log it on the console and it outputs that data. However when I want to put put it on the user interface it gives me that error. Been searchong online but no one has the same issue, maybe because the way to get the params using react stack navigator v5 is by route.params, and v5 came outa couple of months ago. So I will post my code below along with the console.log screen, the error message, and also the object that I am picking from. Thank you!
// App.js
import 'react-native-gesture-handler';
import React from 'react';
import { View , StyleSheet } from 'react-native';
import { NavigationContainer } from '#react-navigation/native';
import About from "./screens/About";
import Home from "./screens/Home";
import PokeDetails from "./screens/PokeDetails"
import { createStackNavigator } from '#react-navigation/stack';
const App =()=> {
const Stack = createStackNavigator();
return(
<View style={styles.container}>
<NavigationContainer>
<Stack.Navigator>
<Stack.Screen name="Home" component={Home}/>
<Stack.Screen name="PokeDetails" component={PokeDetails}/>
<Stack.Screen name="About" component={About}/>
</Stack.Navigator>
</NavigationContainer>
</View>
)
}
const styles = StyleSheet.create({
container: {
flex: 1
}
})
export default App;
// Home.js
import React, { useState } from "react";
import { View, Text , Button, FlatList, ActivityIndicator, TouchableOpacity, Image } from "react-native";
import { GlobalStyles } from "../styles/GlobalStyles";
import PokeDetails from "./PokeDetails";
import { useRoute } from '#react-navigation/native';
class Home extends React.Component {
constructor(props) {
super(props);
this.state = {
isLoading: true,
dataSource: [],
}
}
componentDidMount() {
fetch(`https://pokeapi.co/api/v2/pokemon/?limit=20`)
.then((res)=> res.json())
.then((response)=> {
this.setState({
isLoading: false,
dataSource: response.results,
})
console.log("RESPONSE",response)
console.log("RESPONSE.RESSSULTS",response.results)
})
}
render() {
const showIndicator = this.state.isLoading == true ? <ActivityIndicator size="large" color="#0000ff" /> : null;
return(
<View style={GlobalStyles.container}>
<View style={GlobalStyles.activityIndicator}>{showIndicator}</View>
<FlatList
keyExtractor={(item, index) => item.name}
numColumns={1}
data={this.state.dataSource}
renderItem={({item})=>
<TouchableOpacity onPress={()=> this.props.navigation.navigate('PokeDetails',
{data:"hello"})}>
<PokeDetails imageUrl={`https://projectpokemon.org/images/normal-sprite/${item.name}.gif`} name={item.name}/>
</TouchableOpacity>
}/>
<Button onPress={()=> this.props.navigation.navigate("About")} title="Go to about"/>
</View>
)
}
}
export default Home;
// PokeDetails.js
import React from "react";
import { View, Text , Image, Button} from "react-native";
import {GlobalStyles} from "../styles/GlobalStyles";
import { TouchableOpacity } from "react-native-gesture-handler";
import { useRoute } from '#react-navigation/native';
const PokeDetails =(props)=> {
console.log(props)
console.log(props.route.params.data, "PROPSSSSSSSSSSS");
return(
<View style={GlobalStyles.container}>
<Image source={{uri: props.imageUrl}} style={{height: 50, width: 50}}/>
<Text>{props.route.params.data}</Text>
</View>
)
}
export default PokeDetails;
You are getting the following error because you are pokedetails in your home screen, you can get the data props only if you navigate to pokedetails screen, the thing you can do something like this:
change your Home.js like this:
import React, { useState } from "react";
import { View, Text , Button, FlatList, ActivityIndicator, TouchableOpacity, Image } from "react-native";
import PokeDetails from "./Pokedetails";
import { useRoute } from '#react-navigation/native';
class Home extends React.Component {
constructor(props) {
super(props);
this.state = {
isLoading: true,
dataSource: [],
}
}
componentDidMount() {
fetch(`https://pokeapi.co/api/v2/pokemon/?limit=20`)
.then((res)=> res.json())
.then((response)=> {
this.setState({
isLoading: false,
dataSource: response.results,
})
console.log("RESPONSE",response)
console.log("RESPONSE.RESSSULTS",response.results)
})
}
render() {
const showIndicator = this.state.isLoading == true ? <ActivityIndicator size="large" color="#0000ff" /> : null;
return(
<View>
<View>{showIndicator}</View>
<FlatList
keyExtractor={(item, index) => item.name}
numColumns={1}
data={this.state.dataSource}
renderItem={({item})=>
<TouchableOpacity onPress={()=> this.props.navigation.navigate('PokeDetails',
{data:"hello", imageUrl:`https://projectpokemon.org/images/normal-sprite/${item.name}.gif`})}>
<PokeDetails imageUrl={`https://projectpokemon.org/images/normal-sprite/${item.name}.gif`} name={item.name}/>
</TouchableOpacity>
}/>
<Button onPress={()=> this.props.navigation.navigate("About")} title="Go to about"/>
</View>
)
}
}
export default Home;
Here iam just passing imageUrl also for reference purpose.
change your pokedetails.js some thing like this:
import React from "react";
import { View, Text , Image, Button} from "react-native";
import { TouchableOpacity } from "react-native-gesture-handler";
import { useRoute } from '#react-navigation/native';
const PokeDetails =(props)=> {
console.log("props is",props);
if(props.navigation == undefined)
{
return(
<View>
<Image source={{uri: props.imageUrl}} style={{height: 50, width: 50}}/>
<Text>{props.name}</Text>
</View>
)
}
else{
return(
<View>
<Image source={{uri: props.route.params.imageUrl}} style={{height: 50, width: 50}}/>
<Text>{props.route.params.data}</Text>
</View>
)
}
}
export default PokeDetails;
Here iam just adding a if condition to check whether the screen is loaded is navigated from another screen.
when the Homescreen loaded it will be something like this:
On clicking bulbassor you will be navigating to the pokedetails screen where here iam showing the details you are sending through navigation:
Hope this helps!
So I have built a pokemon application that would display pokemon with their images and details. On the homescreen, I have it so that the first 20 pokemon are shown as a preview. Then if the user wants to learn more about the pokemon, they can press on the pokemon and it would bring the user to the "PokeDetails" screen. However, when I press on the pokemon, it brings me to the "PokeDetails" page but the page is blank. Except for the text that I explicitly render from the "PokeDetails" screen. I have the code for both screens below. Any help is appreciated. Thank you
//Home.js
import React, { useState } from "react";
import { View, Text , Button, FlatList, ActivityIndicator, TouchableOpacity, Image } from "react-native";
import { GlobalStyles } from "../styles/GlobalStyles";
import PokeDetails from "./PokeDetails";
class Home extends React.Component {
constructor(props) {
super(props);
this.state = {
isLoading: true,
dataSource: [],
}
}
componentDidMount() {
fetch(`https://pokeapi.co/api/v2/pokemon/?limit=20`)
.then((res)=> res.json())
.then((response)=> {
this.setState({
isLoading: false,
dataSource: response.results,
})
console.log("RESPONSE",response)
console.log("RESPONSE.RESSSULTS",response.results)
})
}
render() {
const showIndicator = this.state.isLoading == true ? <ActivityIndicator size="large" color="#0000ff" /> : null;
return(
<View style={GlobalStyles.container}>
<View style={GlobalStyles.activityIndicator}>{showIndicator}</View>
<FlatList
numColumns={1}
data={this.state.dataSource}
renderItem={({item})=>
<TouchableOpacity onPress={()=> this.props.navigation.navigate("PokeDetails", {item} )}>
<PokeDetails imageUrl={`https://projectpokemon.org/images/normal-sprite/${item.name}.gif`} name={item.name} item={item} />
</TouchableOpacity>
}/>
<Button onPress={()=> this.props.navigation.navigate("About")} title="Go to about"/>
</View>
)
}
}
export default Home;
// PokeDetails.js
import React from "react";
import { View, Text , Image, Button} from "react-native";
import {GlobalStyles} from "../styles/GlobalStyles";
import { TouchableOpacity } from "react-native-gesture-handler";
import { useRoute } from '#react-navigation/native';
const PokeDetails =({name, imageUrl, detail, route})=> {
return(
<View style={GlobalStyles.container}>
<Text>This text is written expilictly</Text>
<Text>{route.params.item}</Text>
</View>
)
}
export default PokeDetails;
// Root.js
import React from "react"
import { createStackNavigator } from "#react-navigation/stack";
import Home from "../screens/Home";
import PokeDetails from "../screens/PokeDetails";
import { NavigationContainer } from '#react-navigation/native';
const Root =() => {
const Stack = createStackNavigator();
return(
<Stack.Navigator>
<Stack.Screen name="Home" component={Home}/>
<Stack.Screen name="PokeDetails" component={PokeDetails}/>
</Stack.Navigator>
)
}
export default Root;
// App.js
import 'react-native-gesture-handler';
import React from 'react';
import { View , StyleSheet } from 'react-native';
import { NavigationContainer } from '#react-navigation/native';
import { createDrawerNavigator } from "#react-navigation/drawer";
import About from "./screens/About";
import Root from "./Route/Root";
import PokeDetails from "./screens/PokeDetails"
const App =()=> {
const Drawer = createDrawerNavigator();
return(
<View style={styles.container}>
<NavigationContainer>
<Drawer.Navigator>
<Drawer.Screen name="Home" component={Root}/>
<Drawer.Screen name="About" component={About}/>
</Drawer.Navigator>
</NavigationContainer>
</View>
)
}
const styles = StyleSheet.create({
container: {
flex: 1
}
})
export default App;
I don't know if i understood your question. You already pass an item props to your PokeDetails component from your Homescreen, but there is no item in the props your receive in it. just add it and i guess you will access to your data and will be able to display it:
const PokeDetails =({name, imageUrl, detail, item})=> {
return(
<View style={GlobalStyles.container}>
<Image source={{uri: imageUrl}} style={{height: 50, width: 50}}/>
<Text style={GlobalStyles.pokeText}>{name}</Text>
<Text>This text is explicitly written</Text>
// add your stuff here...
<Text>{item.something}</Text>
</View>
)
}
By the way, since you already have the item prop, you can remove the name which already comes from item :)
When I run my app I get the error: 'The component for route 'Camera' must be a react component'. I do not know what this means:
Here is my App.js:
import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import { createAppContainer } from 'react-navigation';
import {createStackNavigator} from 'react-navigation-stack';
import Home from './screens/Home';
import Camera from './screens/Camera'
const MainNavigator = createStackNavigator(
{
Home: {screen: Home},
Camera: { screen: Camera}
},
{
defaultNavigationOptions: {
headerTintColor: '#fff',
headerStyle: {
backgroundColor: '#b83227'
},
headerTitleStyle: {
color: '#fff'
}
}
}
);
Here is my home:
import React from 'react';
import { StyleSheet, Text, View, Image, Button } from 'react-native';
import Camera from './Camera'
export default class Home extends React.Component{
static navigationOptions = {
title: "PhotoClicker"
}
render(){
let photo = this.props.navigation.getParam("Photo", "empty")
const { navigate } = this.props.navigation;
return (
<View style={styles.container}>
<Image
resizeMode="center"
style = {styles.imageHolder}
source={
photo === "empty" ? require("../assets/viking.png") : photo
}
/>
<Button
title="Take Photo"
style={styles.button}
onPress={()=>{
this.props.navigation.navigate(Camera)
}}
/>
</View>
);
}
}
Here is Camera:
import React from 'react';
import { StyleSheet, Text, View, Image, Button } from 'react-native';
export default class Camera extends React.Component{
render(){
const { navigate } = this.props.navigation;
return (
<View style={styles.container}>
<Text>Camera Screen</Text>
</View>
);
}
}
It should just be a button that leads from home to Camera, but all I get is the above error. I have tried to change the imports but I just keep getting the same error. Could there be something wrong with my setup, I feel I get many more errors not directly related to code with React-native than I would with Java for Android.
Since you are adding Camera Screen to createStackNavigator. You can navigate to that screen directly through navigation props. So remove below unnecessary import code from your Home Screen
import Camera from './Camera'
change your navigation action
this.props.navigation.navigate('Camera')
Strange error is appearing while developing one of my React Native project.
enter image description here
Following is the code I am using;
import React, {Component} from 'react';
import {Text, View, Image, StyleSheet} from 'react-native';
import {Content, Container} from 'native-base';
import {Carousel} from 'react-native-looped-carousel';
export default class AppBody extends Component {
render() {
return (
<Container>
<Content>
<Carousel delay={500}>
<View style={[{
backgroundColor: '#BADA55'
}
]}/>
<View style={[{
backgroundColor: 'red'
}
]}/>
<View style={[{
backgroundColor: 'blue'
}
]}/>
</Carousel>
</Content>
</Container>
);
}
}
module.export = AppBody;
Your import from react-native-looped-carousel is incorrect:
import Carousel from 'react-native-looped-carousel'
After fixing that, the carousel won't work. Because you should provide dimensions for it:
import React, { Component } from 'react'
import { Text, View, Image, StyleSheet, Dimensions } from 'react-native'
import { Content, Container } from 'native-base'
import Carousel from 'react-native-looped-carousel'
const {width, height} = Dimensions.get('window')
export default class AppBody extends Component {
constructor(props) {
super(props)
this.state = {
size: {width, height},
}
}
render() {
return (
<Container>
<Content>
<Carousel
delay={2000}
style={this.state.size}
autoplay
pageInfo
onAnimateNextPage={(p) => console.log(p)}
>
<View style={[{backgroundColor: '#BADA55'}, this.state.size]}><Text>1</Text></View>
<View style={[{backgroundColor: 'red'}, this.state.size]}><Text>2</Text></View>
<View style={[{backgroundColor: 'blue'}, this.state.size]}><Text>3</Text></View>
</Carousel>
</Content>
</Container>
)
}
}
module.export = AppBody
I'm trying to import my navigation (with routing) and my main.js to index.ios.js as such:
import PRSNT_demo from './src/main.js'
import NavAllDay from './src/components/navigation.js';
This just renders the last named Component (so only shows my navigation), I couldn't find anything on the subject and I've tried importing the nav into my main.js. Does anyone have documentation on where to find the solution or does anyone know the solution?
Navigation.js (I know this won't really do anything yet I just want it to show both views):
import React, { Component } from 'react';
import { AppRegistry, Text, Navigator, TouchableHighlight } from 'react-native';
import Style from '../Style';
console.log('doing this');
export default class NavAllDay extends Component {
render() {
const routes = [
{title: 'First Scene', index: 0},
{title: 'Second Scene', index: 1},
];
return (
<Navigator
style={Style.header}
initialRoute={routes[0]}
renderScene={(route, navigator) =>
<TouchableHighlight onPress={() => {
if (route.index === 0) {
navigator.push(routes[1]);
} else {
navigator.pop();
}
}}>
<Text>Hello {route.title}!</Text>
</TouchableHighlight>
}
navigationBar={
<Navigator.NavigationBar
routeMapper={{
LeftButton: (route, navigator, index, navState) =>
{
if (route.index === 0) {
return null;
} else {
return (
<TouchableHighlight onPress={() => navigator.pop()}>
<Text>Back</Text>
</TouchableHighlight>
);
}
},
RightButton: (route, navigator, index, navState) =>
{
if (route.index === 1) {
return null;
} else {
return (
<TouchableHighlight onPress={() => navigator.push(routes[1])}>
<Text>Done</Text>
</TouchableHighlight>
);
}
},
Title: (route, navigator, index, navState) =>
{ return (<Text>Awesome Nav Bar</Text>); },
}}
style={Style.header}
/>
}
/>
);
}
}
AppRegistry.registerComponent('PRSNT_demo', () => NavAllDay)
Main.js:
import React, { Component } from 'react';
import Style from './Style';
import {
AppRegistry,
Text,
View
} from 'react-native';
export default class PRSNT_demo extends Component {
render() {
return (
<View style={Style.container}>
<View style={Style.invites}>
<Text style={Style.presentListText}> Section</Text>
</View>
<View style={Style.presentList}>
<Text style={Style.presentListText}>
List
</Text>
</View>
</View>
);
}
}
AppRegistry.registerComponent('PRSNT_demo', () => PRSNT_demo);
AppRegistry.registerComponent('PRSNT_demo', () => PRSNT_demo); this line should only exist in you index.ios.js and index.android.js file.
Also, to import files you just place these at the top of the file you want to use them:
import PRSNT_demo from './src/main.js'
import NavAllDay from './src/components/navigation.js'
if you wanted to use them in your index.ios.js file you need to do something like this:
import React, { Component } from 'react';
import {
AppRegistry,
View
} from 'react-native';
import PRSNT_demo from './src/main.js'
import NavAllDay from './src/components/navigation.js'
export default class Main extends Component {
render() {
return (
<View>
<PRSNT_demo />
<NavAllDay />
</View>
)
}
}
AppRegistry.registerComponent('PRSNT_demo', () => Main);
The AppRegistry is saying which component you want initially rendered.