React Native undefined is not a function error - javascript

I am new to react native this is my first attempt in react native I was following a sample tutorial for the basic understanding of the code and other things I am following this raywenderlich's propertyfinder example, while implementing the first navigation example I am facing this issue:
undefined is not a function (evaluating 'this.props.renderScene(route,this)')
in my android device(Samsung J7) which I am using to run the app
Here is my index.android.js
'use strict';
var React = require('react');
var ReactNative = require('react-native');
var SearchPage = require('./SearchPage');
var styles = ReactNative.StyleSheet.create({
text: {
color: 'black',
backgroundColor: 'white',
fontSize: 30,
margin: 80
},
container: {
flex: 1
}
});
class PropertyFinderApp extends React.Component {
render() {
return (
<ReactNative.Navigator
style={styles.container}
renderScene={this.renderScene}
initialRoute={{
component: SearchPage,
index:0,
title:"home"
}}/>
);
}
}
ReactNative.AppRegistry.registerComponent('PropertyFinder', function() { return PropertyFinderApp });`
and the SearchPage.js file(the other component which I am using):
'use strict';
import React, { Component } from 'react';
import {
StyleSheet,
Text,
TextInput,
View,
TouchableHighlight,
ActivityIndicator,
Image
} from 'react-native';
var styles = StyleSheet.create({
description: {
marginBottom: 20,
fontSize: 18,
textAlign: 'center',
color: '#656565'
},
container: {
padding: 30,
marginTop: 65,
alignItems: 'center'
},
flowRight: {
flexDirection: 'row',
alignItems: 'center',
alignSelf: 'stretch'
},
buttonText: {
fontSize: 18,
color: 'white',
alignSelf: 'center'
},
button: {
height: 36,
flex: 1,
flexDirection: 'row',
backgroundColor: '#48BBEC',
borderColor: '#48BBEC',
borderWidth: 1,
borderRadius: 8,
marginBottom: 10,
alignSelf: 'stretch',
justifyContent: 'center'
},
searchInput: {
height: 36,
padding: 4,
marginRight: 5,
flex: 4,
fontSize: 18,
borderWidth: 1,
borderColor: '#48BBEC',
borderRadius: 8,
color: '#48BBEC'
}
});
export default class SearchPage extends Component {
render() {
return (
<View style={styles.container}>
<Text style={styles.description}>
Search for houses to buy!
</Text>
<Text style={styles.description}>
Search by place-name, postcode or search near your location.
</Text>
<View style={styles.flowRight}>
<TextInput
style={styles.searchInput}
placeholder='Search via name or postcode'/>
<TouchableHighlight style={styles.button}
underlayColor='#99d9f4'>
<Text style={styles.buttonText}>Go</Text>
</TouchableHighlight>
</View>
<TouchableHighlight style={styles.button}
underlayColor='#99d9f4'>
<Text style={styles.buttonText}>Location</Text>
</TouchableHighlight>
</View>
);
}
}
module.exports = SearchPage;
I have no idea what I am doing wrong since I am a beginner in this any help will be appreciated, thanx in advance.

You for got to write renderScene function, see following example:
<ReactNative.Navigator
...
renderScene={this.renderScene.bind(this)} />
renderScene(route, navigationOperations, onComponentRef) {
switch(route.index) {
case 0:
return <SearchPage />
}
}

Related

React-Native 0.68.2 Modals are not working - iOS

I upgraded react native application to react version 17.0.1 and react-native 0.68.2.
Modals are no longer visible on the iOS application beyond that point. I'm using the react-native-modal: "^13.0.1" library to create those modals.
To confirm the issue, I replaced sample modal code react-native-modal-example on top of my existing code. However, the problem is still present.
There is a bug reported like this
Therefore, I used modal provided by react-native instead of using react-native-modal: "^13.0.1" but the same problem is occurred.
Is there any solution for this?
my code as follows,
import React, {useState} from 'react';
import {Image, View, Text, TouchableOpacity, Alert, Pressable, StyleSheet} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import Modal from 'react-native-modal'
const login = props => {
const [modalVisible, setModalVisible] = useState(false);
return (
<SafeAreaView style={styles1.centeredView}>
<Modal isVisible={true}>
<View style={styles1.centeredView}>
<View style={styles1.modalView}>
<Text style={styles1.modalText}>Hello World!</Text>
<Pressable
style={[styles1.button, styles1.buttonClose]}
onPress={() => setModalVisible(!modalVisible)}>
<Text style={styles1.textStyle}>Hide Modal</Text>
</Pressable>
</View>
</View>
</Modal>
<TouchableOpacity
style={[styles1.button, styles1.buttonOpen]}
onPress={() => setModalVisible(true)}>
<Text style={styles1.textStyle}>Show Modal</Text>
</TouchableOpacity>
</SafeAreaView>
);
};
const styles1 = StyleSheet.create({
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: 4,
elevation: 5
},
button: {
borderRadius: 20,
padding: 10,
elevation: 2
},
buttonOpen: {
backgroundColor: "#F194FF",
},
buttonClose: {
backgroundColor: "#2196F3",
},
textStyle: {
color: "white",
fontWeight: "bold",
textAlign: "center"
},
modalText: {
marginBottom: 15,
textAlign: "center"
}
});
export default (login);
This one works!
import React, { useState } from "react";
import {
Modal,
View,
Text,
TouchableOpacity,
Alert,
Pressable,
StyleSheet,
SafeAreaView
} from "react-native";
const Example = props => {
const [modalVisible, setModalVisible] = useState(false);
return (
<SafeAreaView style={styles1.centeredView}>
<Modal isVisible={true}>
<View style={styles1.centeredView}>
<View style={styles1.modalView}>
<Text style={styles1.modalText}>Hello World!</Text>
<Pressable
style={[styles1.button, styles1.buttonClose]}
onPress={() => setModalVisible(!modalVisible)}
>
<Text style={styles1.textStyle}>Hide Modal</Text>
</Pressable>
</View>
</View>
</Modal>
<TouchableOpacity
style={[styles1.button, styles1.buttonOpen]}
onPress={() => setModalVisible(true)}
>
<Text style={styles1.textStyle}>Show Modal</Text>
</TouchableOpacity>
</SafeAreaView>
);
};
export default Example;
const styles1 = StyleSheet.create({
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: 4,
elevation: 5
},
button: {
borderRadius: 20,
padding: 10,
elevation: 2
},
buttonOpen: {
backgroundColor: "#F194FF"
},
buttonClose: {
backgroundColor: "#2196F3"
},
textStyle: {
color: "white",
fontWeight: "bold",
textAlign: "center"
},
modalText: {
marginBottom: 15,
textAlign: "center"
}
});

Make Search using firebase in react native

I am new to react native and firebase. I want to make a search bar that can search all data from firebase according to Barcode value, but I'm facing some errors while doing it. I think that my code is wrong somewhere but don't know where. I have transferred the firebase credentials to dbConfig.js . Here is my firebase data firebase data and my code:
import React,{Component} from 'react';
import { View, Text,TextInput,StyleSheet,Image, Button} from 'react-native';
import firebase from './dbConfig';
export default class ListItem extends Component {
render() {
return (
<>
<View style={styles.BackGround}>
<View style={styles.SectionStyle}>
<Image
source={require('./mic.png')} //mic image here
style={styles.ImageStyle}
/>
<TextInput
style={{ flex: 1, justifyContent: 'center', textAlign: 'center', fontSize: 12}}
placeholder="Search for Product"
underlineColorAndroid="transparent"
//onChangeText={(text) => this.setState({data: text})}
onSubmitEditing = {(text)=> this.setState({data: text})}
value = {this.state.data}
// onSubmitEditing={()=>this._search}
//onSubmitEditing={()=>this.componentWillMount}
/>
<Image
source={require('./usr.png')} //icon image here
style={styles.ImageStyle2}
/>
</View>
<View>
<Text>{this.state.items}</Text>
</View>
</View>
</>
);
}
constructor(props){
super(props);
this.state= {
items: '',
data: '',
};
}
componentWillMount(){
var ref = firebase.database().ref('/');
ref.child(this.state.data).on("value", snapshot =>{
console.log(snapshot.val().info.Price);
//if(snapshot.val().Price == this.state.data){
//this.setState({items: Object.values(snapshot.val())});
//}
//else{
//alert('there is problem');
//}
});
}
}
const styles = StyleSheet.create({
BackGround: {
backgroundColor: '#22abb6',
height: '100%'
},
SectionStyle: {
flexDirection: 'row',
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#fff',
// borderWidth: 0.8,
// borderColor: '#000',
shadowColor:'#176f75',
marginTop: 50,
height: 40,
borderRadius: 10,
margin: 10,
},
ImageStyle: {
padding: 10,
marginLeft: 10,
margin: 5,
height: 25,
width: 25,
resizeMode: 'stretch',
alignItems: 'center',
},
ImageStyle2: {
padding: 10,
marginLeft: 10,
marginRight: 10,
margin: 5,
height: 25,
width: 25,
resizeMode: 'stretch',
alignItems: 'center',
},
});
I did it by changing the follows:
//adding this in TextInput
onSubmitEditing = {this.componentWillMount}
//on changing the function compoundWillMount to async()
componentWillMount= async()=>{

Unable to import files

I have been trying to import a component that contains my custom input component into my profile screen.I have tried import both the ProfTab.js(container of my custom textInput component) and the FlexibleInput.js(custome TextInput.js) into my profileScreen.js separately to make sure there was nothing wrong with the files. I have tried deleting the app and restarting the bundle but nothing seems to be working, but i keep getting thrown this error instead.
Failed to load bundle(http://localhost:8081/index.ios.bundle?platform=ios&dev=true&minigy=false) with error: (Unable to resolve module ../Components/profScreenComp/FlexInput from /Users/apple/Documents/Vscode/React-Native/Fluffy/src/Componensts/profScreenComp/ProfTabs.js: The module ../Components/profScreenComp/FlexInput could not be found from /Users/apple/Documents/Vscode/React-Native/Fluffy/src/Components/profScreenComp/ProfTab.js.
Indeed, none of these files exists)
Below is my profileScreen.js
import React, { Component } from 'react';
import {View, Text, StyleSheet,Dimensions, ImageBackground,Button} from "react-native"
import Auth from "../Components/authComp/auth"
import ProfileTab from '../Components/profScreenComp/ProfTab'
// import FlexibleInput from '../Components/profScreenComp/flexInput'
import {connect} from 'react-redux'
const Width= Dimensions.get('window').width
class ProfileScreen extends Component {
static navigatorStyle = {
navBarHidden: true,
drawUnderNavBar: true,
// navBarTranslucent: true
};
handleNavigation= ()=>{
this.props.navigator.push({
screen: "fluffy.ProfileInfoScreen",
animated: true,
animationType: "ease-in"
})
}
render() {
// let display= (<Auth/>)
if(!this.props.auth){
return(
<Auth/>
)
}else{
return (
<View style={{flex: 1}}>
<ImageBackground style={styles.background}>
<View style= {styles.header}>
<Text style={{color: "white", fontSize: 20,}}>PROFILE</Text>
</View>
<View style={styles.pointsBox}>
</View>
</ImageBackground>
{/* <View style={styles.circle}><Text>M</Text></View> */}
<View style= {styles.activity}>
<View style={styles.tabsContainer}>
<View style={styles.tabs}>
<Text>Profile</Text>
<Text>My Orders</Text>
<Text>Support</Text>
</View>
</View>
<View style={styles.body}>
<ProfileTab/>
{/* <FlexibleInput/> */}
</View>
</View>
</View>
)
}
}
}
const styles= StyleSheet.create({
header:{
width: Width,
height:50,
alignItems: 'center',
justifyContent: "center"
,backgroundColor: "#20265c",
justifyContent: "flex-end",
paddingBottom: 10,
},
background:{
backgroundColor: "maroon",
height: '50%',
flex: 4,
justifyContent:'space-between'
},
pointsBox:{
height: 40,
width: '60%',
backgroundColor: "gray",
borderRadius: 5,
alignSelf: 'center',
},
// circle:{
// alignItems: 'center',
// justifyContent:"center",
// height: 100,
// width: 100,
// backgroundColor: "white",
// position: "absolute",
// borderRadius: 50,
// top: 240,
// left: 140,
// zIndex:2
// },
activity:{
backgroundColor: "gray",
flex: 6,
// justifyContent: "center",
// alignItems: 'center',
},
tabs:{
// marginTop: 10,
// padding: 10,
backgroundColor:'white',
borderRadius: 50,
height: '90%',
width: '90%',
flexDirection: 'row',
justifyContent:'space-around',
alignItems: 'center',
},
tabsContainer:{
flex:1,
justifyContent:'center',
alignItems:'center',
backgroundColor: 'orange'
},
body:{
flex: 9,
backgroundColor: 'beige'
}
})
const mapStateToProps = state => {
return{
auth: state.auth.login
}
}
export default connect(mapStateToProps)(ProfileScreen)
This is the component that contains my custom TextInput component
import React, { Component } from 'react';
import { View, StyleSheet, ScrollView} from 'react-native';
import FlexibleInput from '../Components/profScreenComp/FlexInput'
class profTab extends Component {
render() {
return (
<ScrollView contentContainerStyle={styles.container}>
<View style={styles.content}>
<FlexibleInput styles={styles.input} />
</View>
</ScrollView>
);
}
}
const styles= StyleSheet.create({
container:{
flex:1,
margin: 10,
padding: 10,
justifyContent:'center',
alignItems: 'center',
},
content:{
height: '100%',
width: '100%'
},
input:{
borderColor: 'red',
}
})
export default profTab
And finally my custom TextInput component
import React from 'react'
import {TextInput, StyleSheet} from 'react-native'
const flexibleInput = (props) => (
<TextInput
{...props}
style={[styles.input,props.styles]}
/>
)
const styles= StyleSheet.create({
input: {
width: "100%",
borderWidth: 1,
borderColor: "#eee",
padding: 5,
marginTop: 8,
marginBottom: 8
},
})
export default flexibleInput

View display is not what I expect when using react-native

I'm reading Learning React Native by Bonnie Eisenman and am having trouble with the WeatherProject tutorial in chapter 3. When the app loads in the iOS simulator, it appears to be rendering the contents of Forecast.js but taking up the whole display without anything from WeatherProject.js
Here is my code:
index.ios.js
import {
AppRegistry,
} from 'react-native';
import WeatherProject from './WeatherProject';
AppRegistry.registerComponent('WeatherProject', () => WeatherProject);
WeatherProject.js
import React, {
Component,
} from 'react';
import {
StyleSheet,
Text,
View,
TextInput,
} from 'react-native';
var Forecast = require('./Forecast');
var styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#4D4D4D'
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10
},
input: {
fontSize: 20,
borderWidth: 2,
height: 40
}
});
var WeatherProject = React.createClass({
getInitialState() {
return {
zip: '',
forecast: {
main: 'Clouds',
description: 'few clouds',
temp: 45.7
}
}
},
_handleTextChange(event) {
console.log(event.nativeEvent.text);
this.setState({
zip: event.nativeEvent.text
});
},
render() {
return (
<View style={styles.container}>
<Text style={styles.welcome}>
You input {this.state.zip}.
</Text>
<Forecast
main={this.state.forecast.main}
description={this.state.forecast.description}
temp={this.state.forecast.temp}/>
<TextInput
style={styles.input}
returnKeyType="go"
onSubmitEditing={this._handleTextChange}/>
</View>
);
}
});
module.exports = WeatherProject;
Forecast.js
import React, {
Component,
} from 'react';
import {
StyleSheet,
Text,
View,
} from 'react-native';
var styles = StyleSheet.create({
bigText: {
flex: 2,
fontSize: 20,
textAlign: 'center',
margin: 10,
color: '#FFFFFF'
},
mainText: {
flex: 1,
fontSize: 16,
textAlign: 'center',
color: '#FFFFFF'
}
});
var Forecast = React.createClass({
render() {
return (
<View>
<Text style={styles.bigText}>
{this.props.main}
</Text>
<Text style={styles.mainText}>
Current conditions: {this.props.description}
</Text>
<Text style={styles.bigText}>
{this.props.temp}°F
</Text>
</View>
);
}
});
module.exports = Forecast;
The expected outcome looks like this (from the book):
But my actual outcome is this:
And here is the view debug hierarchy:
Any help at all would be greatly appreciated.
Add this style in Forecast:
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center'
}
then add the style into the View:
<View styles={style.container}>

Firebase.push failed: first argument contains an invalid key($$typeof)

I am learning react native for the first time for developing android app not IOS one and I was learning from Building a Simple ToDo App With React Native and Firebase tutorial from youtube.But I am getting an error while trying to add items. I get following error
Firebase.push failed: first argument contains an invalid key($$typeof) in property 'restaurant.restaurant_name.targetInst._nativeParent._currentElement'.keys must be non-empty strings and cant contain ".","#","$","/","["
What might be creating this issue?
import React, { Component } from 'react';
import Firebase from 'firebase';
import {
AppRegistry,
StyleSheet,
Text,
View,
TouchableHighlight,
TextInput,
ListView
} from 'react-native';
class foodOrderSystem extends Component {
constructor(props){
super(props);
const firebaseRef = new Firebase('foodordersystem.firebaseio.com');
console.log(firebaseRef);
this.itemRef = firebaseRef.child('restaurant');
this.state = {
newRestaurant:'',
// estimated_delivery:'',
// description:'',
restaurantSource: new ListView.DataSource({rowHasChanged: (row1,row2) => row1 !== row2})
};
this.restaurant = [ ];
}
componentDidMount() {
this.itemRef.on('child_added', (snap) => {
this.restaurant.push({
id:snap.key(),
text:snap.val()
});
this.setState({
restaurantSource:this.state.restaurantSource.cloneWithRows(this.restaurant)
});
});
this.itemRef.on('child_removed', (snap) => {
this.restaurant = this.restaurant.filter((x) => x.id !== snap.key());
this.setState({
restaurantSource:this.state.restaurantSource.cloneWithRows(this.restaurant)
});
});
}
addRestaurant(){
if(this.state.newRestaurant !== ''){
this.itemRef.push({
restaurant_name: this.state.newRestaurant
});
this.setState({ newRestaurant:''});
}
}
removeRestaurant(rowData){
this.itemRef.child(rowData.id).remove();
}
render() {
return (
<View style={styles.appContainer}>
<View style={styles.titleView}>
<Text style={styles.titleText}>
foodOrderSystem
</Text>
</View>
<View style={styles.inputcontainer}>
<TextInput
style={styles.input}
onChange={(text) => this.setState({newRestaurant:text})}
value={this.state.newRestaurant} />
<TouchableHighlight
style={styles.button}
onPress={ () => this.addRestaurant() }
underlayColor="#00ffff">
<Text style={styles.btnText}>Add</Text>
</TouchableHighlight>
</View>
<ListView
dataSource={this.state.restaurantSource}
renderRow={this.renderRow.bind(this)} />
</View>
);
}
renderRow(rowData){
return(
<TouchableHighlight
underlayColor="#dddddd"
onPress={() => this.removeRestaurant(rowData)}>
<View>
<View style={styles.row}>
<Text style={styles.todoText}>{rowData.text}</Text>
</View>
<View style={styles.separator} />
</View>
</TouchableHighlight>
);
}
}
const styles = StyleSheet.create({
appContainer:{
flex: 1
},
titleView:{
backgroundColor: '#48afdb',
paddingTop: 30,
paddingBottom: 10,
flexDirection: 'row'
},
titleText:{
color: '#fff',
textAlign: 'center',
fontWeight: 'bold',
flex: 1,
fontSize: 20,
},
inputcontainer: {
marginTop: 5,
padding: 10,
flexDirection: 'row'
},
button: {
height: 36,
flex: 2,
flexDirection: 'row',
backgroundColor: '#48afdb',
justifyContent: 'center',
color: '#FFFFFF',
borderRadius: 4,
},
btnText: {
fontSize: 18,
color: '#fff',
marginTop: 6,
},
input: {
height: 36,
padding: 4,
marginRight: 5,
flex: 4,
fontSize: 18,
borderWidth: 1,
borderColor: '#48afdb',
borderRadius: 4,
color: '#48BBEC'
},
row: {
flexDirection: 'row',
padding: 12,
height: 44
},
separator: {
height: 1,
backgroundColor: '#CCCCCC',
},
todoText: {
flex: 1,
},
});
AppRegistry.registerComponent('foodOrderSystem', () => foodOrderSystem);
Here is the attachment of error

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