I was editing one of the '.js' files and after saving my work after some changes, when I typed 'rr' to refresh application on the emulator, I kept getting this message.
Android Application Emulator keeps stopping
App info
Close app
enter image description here
After creating Form.js and under a components folder in my project in the visual studio code editor and importing it in my Login.js that's where the error started to occur. IDK what I did wrong. I'm new to React Native and am just learning.
Form.js
import React, {Component} from 'react';
import {
StyleSheet,
Text,
View,
TextInput
} from 'react-native';
export default class Login extends Component<{}> {
render(){
return(
<View style={styles.container}>
<TextInput style={styles.inputBox}
underlineColorAndroid='rgba(0,0,0,0)'
placeholder="Email"
placeholderTextColor = "#ffffff"
/>
<TextInput style={styles.inputBox}
underlineColorAndroid='rgba(0,0,0,0)'
placeholder="Password"
placeholderTextColor = "#ffffff"
/>
</View>
)
}
}
const styles = StyleSheet.create({
container : {
flex: 1,
justifyContent: 'center',
alignItems: 'center'
},
inputBox: {
width:300,
backgroundColor:'rgba(255,255,255,0.3)',
borderRadius: 25,
paddingHorizontal: 16,
fontSize: 16,
color:'#ffffff',
marginVertical: '10'
}
});
Login.js
import React, {Component} from 'react';
import {
StyleSheet,
Text,
View,
StatusBar
} from 'react-native';
import Logo from '../components/Logo';
import Form from '../components/Form';
export default class Login extends Component<{}> {
render () {
return(
<View style={styles.container}>
<Logo/>
<Form/>
</View>
)
}
}
const styles = StyleSheet.create({
container : {
backgroundColor: '#29b6f6',
flex: 1,
alignItems: 'center',
justifyContent: 'center',
}
});
Here is your solution
Your application is crashed because of this props underlineColorAndroid="rgba(0,0,0,0)" in your TextInput and also minor change in inputBox style remove string value marginVertical: "10" to marginVertical: 10
Form.js
import React, { Component } from "react";
import { StyleSheet, Text, View, TextInput } from "react-native";
export default class Login extends Component {
render() {
return (
<View style={styles.container}>
<TextInput
style={styles.inputBox}
// underlineColorAndroid="rgba(0,0,0,0)"<---Comment this code---
placeholder="Email"
placeholderTextColor="#ffffff"
/>
<TextInput
style={styles.inputBox}
// underlineColorAndroid="rgba(0,0,0,0)"<---Comment this code---
placeholder="Password"
placeholderTextColor="#ffffff"
/>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: "center",
alignItems: "center"
},
inputBox: {
width: 300,
backgroundColor: "rgba(255,255,255,0.3)",
borderRadius: 25,
paddingHorizontal: 16,
fontSize: 16,
color: "#ffffff",
marginVertical: 10 <-----Remove string to number---
}
});
Output:--
Related
I am getting unnecessary space but I want to start my code from the very top. I want to make header of my own or be able to customize the 'gray' region. How to do it? Pls check the attached picture
I am attaching code and picture alongwith.
Phone Screen Image
App.js code-
import React from 'react';
import {View, StyleSheet, Text} from 'react-native';
import Header from './components/Header';
export default function App() {
return (
<View style={styles.screen}>
<Header title="I am Header" />
</View>
);
}
const styles = StyleSheet.create({
screen: {
flex: 1,
},
});
Header.js code-
import React from 'react';
import {Text, View, StyleSheet} from 'react-native';
const Header = (props) => {
return (
<View style={styles.header}>
<Text style={styles.headerTitle}>{props.title}</Text>
</View>
);
};
const styles = StyleSheet.create({
header: {
width: '100%',
height: 90,
backgroundColor: 'yellow',
alignItems: 'center',
justifyContent: 'center',
},
headerTitle: {
color: 'black',
fontSize: 18,
},
});
export default Header;
I have an input that is cutt off at the top. Is it possible to have it aligned directly under the black bar without writing specific margins/padding for it? If I take off the padding the element completely dissapears from the screen
import React, { Component } from 'react';
import {View, TextInput, StyleSheet, Dimensions } from 'react-native';
export default function IndoorFOrm() {
const [value, onChangeText] = React.useState('Useless Placeholder');
return (
<View style={styles.container}>
<TextInput
style={styles.button}
onChangeText={text => onChangeText(text)}
value={value}
/>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
justifyContent: 'center',
paddingTop: 35,
backgroundColor: '#ecf0f1',
},
button:{
borderRadius: 4,
borderWidth: 2,
width: 100,
height: 40,
borderColor: 'red',
backgroundColor: "rgb(72, 120, 166)",
}
});
SafeAreaView does not work on Android, I generally do this.
import React from 'react';
import { Platform, StyleSheet } from 'react-native';
const styles = new StyleSheet.create({
screenPadding: {
paddingTop: Platform.OS === 'android' ? 25 : 0,
}
});
Try using StatusBar.currentHeight which gives the Status Bar height in Android.
import React, { Component } from 'react';
import {View, TextInput, StyleSheet, Dimensions, StatusBar } from 'react-native';
export default function IndoorFOrm() {
const [value, onChangeText] = React.useState('Useless Placeholder');
return (
<View style={styles.container}>
<TextInput
style={styles.button}
onChangeText={text => onChangeText(text)}
value={value}
/>
</View>
);
}
const styles = StyleSheet.create({
container: {
alignItems: 'center',
justifyContent: 'center',
height: StatusBar.currentHeight,
backgroundColor: '#ecf0f1',
},
button:{
borderRadius: 4,
borderWidth: 2,
width: 100,
height: 40,
borderColor: 'red',
backgroundColor: "rgb(72, 120, 166)",
}
});
Using SafeAreaView
import React, { Component } from 'react';
import {View, TextInput, StyleSheet, Dimensions } from 'react-native';
import SafeAreaView from 'react-native-safe-area-view';
export default function IndoorFOrm() {
const [value, onChangeText] = React.useState('Useless Placeholder');
return (
<View style={styles.container}>
<SafeAreaView>
<TextInput
style={[styles.button, {paddingTop: insets.top}]}
onChangeText={text => onChangeText(text)}
value={value}
/>
</SafeAreaView>
</View>
);
}
Link: https://github.com/react-native-community/react-native-safe-area-view
add 'react-native-safe-area-context' to your project and then
import {SafeAreaView} from 'react-native-safe-area-context'
now use this particular <SafeAreaView></SafeAreaView> to wrap your view should work perfectly on iOS and android
I have following code in App.js
import React, { Component } from 'react';
import { Text, View,} from 'react-native';
import{DrawerNavigator, DrawerActions} from 'react-navigation';
import { Menu} from './src/components/menu';
export default class MainView extends Component {
render(){
return(
<View>
<Menu />
<Text> WHAT ??? </Text>
</View>
);
}
}
and following code in src/components/menu.js
'use strict';
import React, { Component } from 'react';
import { Text, View, StyleSheet, Image, ScrollView} from 'react-native';
import Icon from 'react-native-vector-icons/FontAwesome5';
import{DrawerNavigator, DrawerActions} from 'react-navigation';
export class Menu extends Component {
render(){
return(
<View style= {styles.navContainer}>
<View style= {styles.navContainerFlexing}>
<View>
<Icon name="bars" size={25} color= 'black' style={{marginLeft: 10, fontWeight: '200' }} onPress={() => this.props.navigation.dispatch(DrawerActions.toggleDrawer())} />
</View>
<Text style={[styles.whiteText, styles.navItem]}>Home</Text>
</View>
</View>
);
}
}
export const Drawer = DrawerNavigator(
{
Menu: Menu,
},
{
// initialRouteName: 'Home',
},
{
drawerPosition: 'left',
initialRouteName: 'Home',
drawerBackgroundColor: 'white',
drawerWidth: 300,
}
);
const styles= StyleSheet.create({
navContainer: {
height: 55,
backgroundColor: '#3ba558',
alignItems: 'center',
// flex: 1,
flexDirection: 'row',
// justifyContent: 'flex-start'
},
navContainerFlexing: {
flex: 2,
flexDirection: 'row',
backgroundColor: '#3ba558',
paddingLeft: 20
},
whiteText: {
color: 'white',
},
navItem: {
alignItems: 'center',
marginTop: 'auto',
marginBottom: 'auto',
marginLeft: 10
},
});
Now I want my Menu class to display in App.js, which is displaying but and I also want it workable DrawerNavigator in homepage, right now the drawer is giving:
undefined is not an object (evaluating '_this.props.navigation.dispatch')
I Have explained the configuration of DrawerNavigator in the below link.
Look into the accepted answer in the below link.
How to create a Drawer Component and adding it to multiple screens
As I explained in it try to understand the concept and do not copy the syntax.
Do a comparison with your configuration, you will find your problem.
im just learning how to use react native but im having a little trouble when im trying to import an external component, i got an unexpected token (13:6) error. i jsut cant figure it out what im doing woring, please help me and show me what is wrong and why i cant import the component .
thank you
this is my code
import React, { Component } from 'react';
import {
AppRegistry,
StyleSheet,
Text,
View
} from 'react-native';
import ComponenteTexto from './componenteTexto';
export default class primero extends Component {
render() {
return (
<View style={styles.container}>
<componenteTexto/>
<Text style={styles.welcome}>
Welcome to React Native!
</Text>
<Text style={styles.instructions}>
To get started, edit index.android.js
</Text>
<Text style={styles.instructions}>
Double tap R on your keyboard to reload,{'\n'}
Shake or press menu button for dev menu,{'\n'}
<Text style={styles.instructions1}>
te amo tefita {5*2}
</Text>
</Text>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: 'white',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
instructions: {
textAlign: 'center',
color: 'skyblue',
marginBottom: 8,
},
instructions1: {
fontSize: 25,
textAlign: 'center',
color: 'black',
marginBottom: 8,
},
});
AppRegistry.registerComponent('primero', () => primero);
`
and this is the component i am trying to import
import React, {Component} from 'react';
import {
View,
Text
} from 'react-native';
export default class ComponenteTexto extends Component {
render() {
return{
<View>
<Text>
Prueba
</Text>
</View>
}
}
}
and this is what i get as error
enter image description here
Your ComponenteTexto component is using { } instead of ( ) in the return statement so it's not returning the expected type of object. Try changing it to:
return (
<View>
<Text>
Prueba
</Text>
</View>
)
Need some help with React Native. Searched in Google, but didn't find any solution.
I have one project which works on android. Here code:
import React, { Component } from 'react';
import {
AppRegistry,
StyleSheet,
Text,
View
} from 'react-native';
export default class MyApp extends Component {
render() {
return (
<View style={styles.container}>
<Text style={styles.welcome}>
Welcome to React Native!
</Text>
<Text style={styles.instructions}>
To get started, edit index.android.js
</Text>
<Text style={styles.instructions}>
Double tap R on your keyboard to reload,{'\n'}
Shake or press menu button for dev menu
</Text>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
instructions: {
textAlign: 'center',
color: '#333333',
marginBottom: 5,
},
});
AppRegistry.registerComponent('MyApp', () => MyApp);
But when i try to add my own component it like this:
import React, { Component } from 'react';
import {
AppRegistry,
StyleSheet,
Text,
View
} from 'react-native';
import MainPage from "./app/components/MainPage/MainPage";
export default class MyApp extends Component {
render() {
return (
<View style={styles.container}>
<Text style={styles.welcome}>
Welcome to React Native!
</Text>
<Text style={styles.instructions}>
To get started, edit index.android.js
</Text>
<Text style={styles.instructions}>
Double tap R on your keyboard to reload,{'\n'}
Shake or press menu button for dev menu
</Text>
<MainPage/>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
instructions: {
textAlign: 'center',
color: '#333333',
marginBottom: 5,
},
});
AppRegistry.registerComponent('MyApp', () => MyApp);
i get error in emulator:
Can somebody help?
Code for component MainPage:
import React, {Component} from 'react';
import {AppRegistry, StyleSheet, View, Text} from 'react-native';
export default class MainPage extends Component {
render() {
return (
<View>
<Text style={styles.welcome}>
Welcome to React Native!
</Text>
</View>
);
}
}
MainPage.propTypes = {}
MainPage.defaultProps = {}
const styles = StyleSheet.create({
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
}
});
AppRegistry.registerComponent('MainPage', () => MainPage);
I find solution. It was because of file format. It should be .js and not .jsx. After this correction all works fine. I hope it will help someone