This is the entire code
class App extends React.Component {
render() {
return (
<div className="container">
<Nav />
</div>
);
}
}
const styles = StyleSheet.create({
topnav: {
position : 'fixed',
top : 0,
right : 0
}
});
ReactDOM.render(<App />, document.getElementById('app'));
Why does this error occur? Should import anything to support 'StyleSheet'?
You have to use this import for the Style sheet:
import { StyleSheet } from 'react-native';
But another problem is that you are using a div. Div's are not available in React-Native, so you have to use other elements (like views).
Example:
import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
export default class App extends React.Component {
render() {
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff',
alignItems: 'center',
justifyContent: 'center'
}
});
return <View style={styles}><Text>I'm a Text</Text></View>;
}
}
Related
I am new to react native and I have been trying to create a header and pull out menu using createDrawerNavigator.
When running my code I get the following error.
Error: The component for route 'Home' must be a React component. For example:
import MyScreen from './MyScreen';
Home: MyScreen,
}
You can also use a navigator:
import MyNavigator from './MyNavigator';
Home: MyNavigator,
}
Here is my app.js file:
import React from 'react';
import { Button, View, Text } from 'react-native';
import { createAppContainer } from 'react-navigation';
import MyDrawerNavigator from './components/MyDrawerNavigator';
const MyApp = createAppContainer(MyDrawerNavigator);
export default class App extends React.Component {
render() {
return <MyApp />;
}
}
My HomeScreen.js file
import React from 'react';
import { Text, Button } from 'react-native';
import LogoTitle from './LogoTitle';
class MyHomeScreen extends React.Component {
static navigationOptions = ({ navigation }) => {
return {
headerTitle: <LogoTitle />,
headerLeft: (
<Button
onPress={() => this.props.navigation.navigate('DrawerToggle')}
title={'Menu'}
/>
),
};
};
render() {
return (
<View style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}>
<Text>Home Screen</Text>
</View>
);
}
}
export default MyHomeScreen;
My MyDrawerNavigator.js file
import React from 'react';
import { Button, Platform, Image, View, Text } from 'react-native';
import { createDrawerNavigator } from 'react-navigation-drawer';
import MyHomeScreen from './HomeScreen';
import DetailsScreen from './DetailScreen';
const MyDrawerNavigator = createDrawerNavigator(
{
Home: MyHomeScreen,
Details: DetailsScreen,
}, {
drawerPosition: 'right',
contentOptions: {
activeTintColor: '#000',
},
});
export default MyDrawerNavigator
The are 2 problems here:
1) You are not exporting your MyDrawerNavigator just add:
export default MyDrawerNavigator
to your MyDrawerNavigator.js file
2) You are not exporting your HomeScreen. You'll have to create a separate file for it, like you did with DetailsScreen.
The HomeScreen.js file would look like:
class MyHomeScreen extends React.Component {
static navigationOptions = ({ navigation }) => {
return {
headerTitle: <LogoTitle />,
headerLeft: (
<Button
onPress={() => this.props.navigation.navigate('DrawerToggle')}
title={'Menu'}
/>
),
};
};
render() {
return (
<View style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}>
<Text>Home Screen</Text>
</View>
);
}
}
You NEED to add a render inside of your screens
Am trying to start playing with React Native now. And I come from web development field.
Since start, am trying to organize my folder structure so that it would be easy for me to understand and make modifications later.
Right now the folder structure is as follows:
/screens
HomeScreen.js
ProfileScreen.js
/navigation
MainNavigation.js
App.js
... etc
Am using Expo CLI as this is my first time working on React Native.
/navigation/MainNavigation.js
import React from 'react';
import { createStackNavigator, createAppContainer } from 'react-navigation';
import HomeScreen from '../screens/HomeScreen';
import ProfileScreen from '../screens/ProfileScreen';
const RootStack = createStackNavigator(
{
Home: HomeScreen,
Profile: ProfileScreen,
},
{
initialRouteName: 'Home',
}
);
const AppContainer = createAppContainer(RootStack);
export default class Navigation extends React.Component {
render() {
return (
<AppContainer />
);
}
}
/screens/HomeScreen.js
import React from 'react';
import { StyleSheet, Text, View, Button, TouchableOpacity } from 'react-native';
export default function HomeScreen() {
return (
<View style={styles.container}>
<TouchableOpacity style={styles.blue_btn} onPress={() => this.props.navigation.navigate('Profile')}>
<Text style={styles.white_text}>Profile</Text>
</TouchableOpacity>
<Text>Open up App.js to start working on your app!</Text>
</View>
);
}
HomeScreen.navigationOptions = {
header: null,
};
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff',
alignItems: 'center',
justifyContent: 'center',
},
blue_btn: {
backgroundColor: '#13baa8',
padding: 10,
},
white_text: {
color: 'white',
}
});
/screens/ProfileScreen.js
import React from 'react';
import { StyleSheet, Text, View, Button } from 'react-native';
export default function ProfileScreen() {
return (
<View style={styles.container}>
<Text>Open up App.js to start working on your app!</Text>
</View>
);
}
ProfileScreen.navigationOptions = {
title: 'Profile',
};
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff',
alignItems: 'center',
justifyContent: 'center',
},
});
App.js
import React from 'react';
import Navigation from './navigation/MainNavigation';
export default class App extends React.Component {
render() {
return (
<Navigation />
);
}
}
When I click on the Profile button in the HOME Screen, it is showing this message:
undefined is not an object(evaluating '_this.props.navigation')
Thank you
import React, { Component } from 'react';
import { createStackNavigator, createAppContainer } from 'react-navigation';
import ScreenOne from './ScreenOne';
import ScreenTwo from './ScreenTwo';
const NavStack = createStackNavigator({
ScreenOne: {
screen: ScreenOne,
},
ScreenTwo: {
screen: ScreenTwo,
},
});
const App = createAppContainer(NavStack);
export default App;
I have been trying to display a MenuButton and SideBar that works well when tested individually on a blank page called SettingScreen. based on some situations either the SideBar shows or nothing, only if implemented alone will the MenuButton show.
After a few trials, I realized that the alignItems prop allows the MenuButton to be displayed if implemented without the SideBar but eliminated the SideBar, and if both are implemented without the presence of alignItems then only the SideBar shows. I am new to this and I have been wondering how can I make sure that only the MenuButton is aligned and that the presence of the SideBar doesn't affect the MeuButton position or presence. And if there are better ways please do tell, thank you.
Menu Button:
import React from 'react';
import {AppRegistry, StyleSheet, View} from "react-native" ;
import Icon from 'react-native-vector-icons/Ionicons'
import {widthPercentageToDP as wp, heightPercentageToDP as hp} from 'react-native-responsive-screen'
export default class MenuButton extends React.Component {
render() {
return(
<View >
<Icon name= "ios-menu" size={wp('12%')}
color='#9B9B9B'
style={{position: 'absolute', top: wp('-82.5%'), left: wp('-46%'), }}
onPress={() => this.props.navigation.openDrawer()} >
</Icon>
</View>
)
}
}
AppRegistry.registerComponent('Menu', () => FixedDimensionsBasics);
SideBar:
import React from 'react';
import {AppRegistry, StyleSheet, View} from "react-native" ;
import {widthPercentageToDP as wp, heightPercentageToDP as hp} from 'react-native-responsive-screen'
export default class MenuButton extends React.Component {
render() {
return(
<View style={styles.container}>
</View>
)
}
}
const styles= StyleSheet.create({
container:{
flex: 1,
backgroundColor: '#FFFF',
left: wp('75%'),
width: 100,
}})
App.js:
import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import MenuButton from './Menu/MenuButton'
import SideBar from './Menu/SideBar'
export default class SettingScreen extends React.Component{
render(){
return(
<View style={styles.container}>
<MenuButton navigation= {this.props.navigation}/>
<SideBar/>
</View>
)
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#0000',
alignItems: 'center',
justifyContent: 'center',
}
});
with this code the result is a blank page
I have created a MenuButton as well as 2 other pages one of them being the settingScreen, where I have imported the MenuButton within both files and they seem to be working fine. But when I import the setting Screen on the DrawerNavigator file it doesn't recognize MenuButton
Failed to load bundle(http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false) with error:(Unable to resolve module `./Menu/MenuButton` from `/Users/camillebasbous/Project/Menu/SettingScreen.js`: The module `./Menu/MenuButton` could not be found from `/Users/camillebasbous/Project/Menu/SettingScreen.js`. Indeed, none of these files exist:
* `/Users/camillebasbous/Project/Menu/Menu/MenuButton(.native||.ios.js|.native.js|.js|.ios.json|.native.json|.json|.ios.ts|.native.ts|.ts|.ios.tsx|.native.tsx|.tsx)`
* `/Users/camillebasbous/Project/Menu/Menu/MenuButton/index(.native||.ios.js|.native.js|.js|.ios.json|.native.json|.json|.ios.ts|.native.ts|.ts|.ios.tsx|.native.tsx|.tsx)` (null))
__38-[RCTCxxBridge loadSource:onProgress:]_block_invoke.228
RCTCxxBridge.mm:414
___ZL36attemptAsynchronousLoadOfBundleAtURLP5NSURLU13block_pointerFvP18RCTLoadingProgressEU13block_pointerFvP7NSErrorP9RCTSourceE_block_invoke.118
__80-[RCTMultipartDataTask URLSession:streamTask:didBecomeInputStream:outputStream:]_block_invoke
-[RCTMultipartStreamReader emitChunk:headers:callback:done:]
-[RCTMultipartStreamReader readAllPartsWithCompletionCallback:progressCallback:]
-[RCTMultipartDataTask URLSession:streamTask:didBecomeInputStream:outputStream:]
__88-[NSURLSession delegate_streamTask:didBecomeInputStream:outputStream:completionHandler:]_block_invoke
__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__
-[NSBlockOperation main]
-[__NSOperationInternal _start:]
__NSOQSchedule_f
_dispatch_call_block_and_release
_dispatch_client_callout
_dispatch_continuation_pop
_dispatch_async_redirect_invoke
_dispatch_root_queue_drain
_dispatch_worker_thread2
_pthread_wqthread
start_wqthread
I have tried testing ou the other page and after a few tests I realized that the presence of the imported MenuButton within these pages is what is forcing an error Is there a way to import a file that has imported another to be displayed or do I have to import both of them within drawerNavigation and if so how to structure the code. Thanks
Drawer Navigation code:
import * as React from 'react';
import { Text, View, Image, ScrollView, StyleSheet } from 'react-native';
import {
createDrawerNavigator,
createAppContainer,
DrawerItems,
SafeAreaView,
} from 'react-navigation';
import SettingScreen from './Menu/SettingScreen'
class Home extends React.Component {
static navigationOptions = {
title: 'Home',
};
render() {
return (
<View style={styles.container}>
<SettingScreen/>
</View>
);
}
}
const Navigator = createDrawerNavigator(
{
Home,
},
{
//drawerType: 'back',
// drawerPosition: 'right',
// drawerWidth: 200,
drawerBackgroundColor: '#262A2C',
// contentComponent: CustomDrawerContentComponent
}
);
export default createAppContainer(Navigator);
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
backgroundColor: '#ecf0f1',
}
});
SettingScreen code:
import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import MenuButton from './Menu/MenuButton'
export default class SettingScreen extends React.Component{
render(){
return(
<View style={styles.container}>
<MenuButton/>
<Text style={styles.text}>Settings</Text>
</View>
)
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: 'rgba(215,215,215,1)',
alignItems: 'center',
justifyContent: 'center',
},
text:{
fontSize: 30,
}
});
MenuButton code:
import React from 'react';
import {AppRegistry, StyleSheet, View} from "react-native" ;
import Icon from 'react-native-vector-icons/Ionicons'
import {widthPercentageToDP as wp, heightPercentageToDP as hp} from 'react-native-responsive-screen'
export default class MenuButton extends React.Component {
render() {
return(
<View >
<Icon name= "ios-menu" size={wp('12%')} color='#9B9B9B' style={{position: 'absolute', top: wp('-82.5%'), left: wp('-46%'), }}></Icon>
</View>
)
}
}
AppRegistry.registerComponent('Menu', () => FixedDimensionsBasics);
The path you are using on import is relative to your file. So, as everything is on the same folder, you must correct the import path like that:
On Drawer Navigator code
import SettingScreen from './SettingScreen'
On SettingScreen code
import MenuButton from './MenuButton'
In my React- Native project I have installed the following version of react-navigation:
npm install react-navigation#^1.0.0-beta.11
And then run the command:
npm install
After all these installation I have created a class named WelcomeScreen.js and here is the code given below for that-
WelcomeScreen.js
import React, { Component } from "react";
import {
View,
StyleSheet,
Button
} from "react-native";
class WelcomeScreen extends Component {
static navigationOptions = {
header: 'none'
}
render() {
return (
<View style={styles.container}>
<Button title="Log in" onPress={() => this.props.navigation.navigate('LoginScreen')}/>
<Button title="Sign Up" onPress={() => this.props.navigation.navigate('SignUpScreen')}/>
</View>
)
}
}
export default WelcomeScreen;
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
justifyContent: 'center'
}
});
After that, I have routed this class in my App.js file. Here is the code given below:
App.js
import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import { StackNavigator } from 'react-navigation'
import WelcomeScreen from './screens/WelcomeScreen'
export default class App extends React.Component {
render() {
return (
<AppStackNavigator/>
);
}
}
const AppStackNavigator = new StackNavigator({
WelcomeScreen: { screen: WelcomeScreen }
})
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff',
alignItems: 'center',
justifyContent: 'center',
},
});
Then after running my project, I am keep getting this error:
Invarient violation:Text strings must be rendered within a component
Invarient violation:Text strings must be rendered within a component
I am not understanding why I am getting this error ?
I have tried following solutions-
Invariant Violation: Text strings must be rendered within a <Text> component
https://github.com/facebook/react-native/issues/20084
None of them were helpful for me. So, it would be very nice if someone help me out with this.
You have used a wrong value in a header
static navigationOptions = {
header: "none"
};
Replace "none" with null
static navigationOptions = {
header: null
};
const AppStackNavigator = new StackNavigator({
WelcomeScreen: { screen: WelcomeScreen }
})
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff',
alignItems: 'center',
justifyContent: 'center',
}**,**
});
is it this comma?
I'd consider working with React's newest navigation package react-navigation-stack (currently in 2.0 alpha - link).
You would implement this exactly like previous react-navigation stack navigators.
import React from 'react'
// ...
import { createAppContainer } from 'react-navigation'
import { createStackNavigator } from 'react-navigation-stack'
const HomeStack = createStackNavigator(
{ HomeScreen, AboutScreen },
{ initialRouteName: "HomeScreen" }
)
HomeStack.navigationOptions = {
headerShown: false, // a more concise option, to avoid future deprecation.
}
// ... continues in next code block
Don't forget to wrap your application in a react-navigation AppContainer too.
// ...
const AppNav = createAppContainer(HomeStack)
export default AppNav
Of course, if you're modifying navigationOptions in other screens, you would simply attach the alternate options within that screen component:
class HomeScreen extends React.Component {
static navigationOptions = {
headerShow: false
}
render() {
return (<View><Text>Welcome home.</Text></View>)
}
}
As seen above, we can now use the navigation option: headerShown: false.
With this new package, you'll be preparing your application for the future iterations of React's navigation packages.
Note ;'s left out as a styling choice.