import React, { Component } from 'react';
import { View, Text, FlatList, TouchableOpacity, Dimensions, StyleSheet } from 'react-native';
const data = [
{id: 'Music', value: 'Music'},
{id: 'Events', value: 'Events'},
{id: 'About Us', value: 'About Us'},
{id: 'Benefits', value: 'Benefits'},
{id: 'Account', value: 'Account'},
{id: 'Social Media', value: 'Social Media'},
{id: 'FAQ', value: 'FAQ'},
{id: 'Settings', value: 'Settings'}
];
const numColumns = 2;
const size = Dimensions.get('window').width/numColumns;
export const Grid = () => {
return (
<FlatList
style={{ marginTop: 20 }}
data={data}
renderItem={({item}) => (
<TouchableOpacity style={styles.itemContainer}>
<Text style={styles.item}>{item.value}</Text>
</TouchableOpacity>
)}
keyExtractor={item => item.id}
numColumns={numColumns} />
);
}
const styles = StyleSheet.create({
itemContainer: {
width: size,
height: size
},
item: {
flex: 1,
margin: 15,
fontSize: 25,
fontWeight: 'bold',
color: 'white',
backgroundColor: 'lightblue'
}
});
I want to be able to center text in both axes
I tried using justifyContent: "center" in the child and parent views but it doesn't work.
textAlign: "center" is able to align the text horizontally.
try like this.
export const Grid = () => {
return (
<FlatList
style={{ marginTop: 20 }}
data={data}
renderItem={({item}) => (
<TouchableOpacity style={styles.itemContainer}>
<View style={styles.item}>
<Text style={styles.itemText}>{item.value}</Text>
</View>
</TouchableOpacity>
)}
keyExtractor={item => item.id}
numColumns={numColumns} />
);
}
const styles = StyleSheet.create({
itemContainer: {
width: size,
height: size
},
item: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
margin: 15,
backgroundColor: 'lightblue'
},
itemText: {
fontSize: 25,
textAlign: 'center',
fontWeight: 'bold',
color: 'white',
}
});
Please attach a screenshot, asking questions about designing in react native. Coming to the answer you can try this.
item:{
alignSelf: 'center',
flex: 1,
margin: 15,
fontSize: 25,
fontWeight: 'bold',
color: 'white',
backgroundColor: 'lightblue'
},
itemContainer: {
width: size,
height: size,
justifyContent: 'center',
alignItems: 'center'
},
Your itemContainer class is missing the display: flex property. This is needed to use flexbox properties on the flex items.
Related
I'm creating onBoarding screens and I have created each of the screen item as a component and trying to render them with Flatlist so far everything is working smoothly but when I swipe the flatlist to see the other screens it's not working it swipes 40% and and forcefully shows the current screen it seems like there is some flex styling issues and I could able to figure it out please suggest.
Here is the video for explaination: https://youtube.com/shorts/pHbTs7ifMww
OnBoardingScreen.js
import React, { useState } from 'react';
import { Dimensions, FlatList, SafeAreaView, View, StyleSheet, Text, Image } from 'react-native';
const { width, height } = Dimensions.get('window');
const COLORS = {primary : '#ff006c', white: '#ffffff', black: '#000000'};
const slides = [
{
id: '1',
image: require('../../images/OnBoardingImages/1.png'),
title: 'You can mark time',
description: 'Lorem ipsum is a placeholder text commonly used to demonstrate the visual',
},
{
id: '2',
image: require('../../images/OnBoardingImages/2.png'),
title: 'You can mark time',
description: 'Lorem ipsum is a placeholder text commonly used to demonstrate the visual',
},
{
id: '3',
image: require('../../images/OnBoardingImages/3.png'),
title: 'You can mark time',
description: 'Lorem ipsum is a placeholder text commonly used to demonstrate the visual',
},
]
const Slide = ({item}) => {
return (
<View style={styles.slideView}>
<Image source={item.image} style={styles.slideImage} />
<Text style={styles.slideTitle}>{item.title}</Text>
<Text style={styles.slideDescription}>{item.description}</Text>
</View>
);
}
const OnBoardingScreen = ({ navigation }) => {
const [currentSlideIndex, setCurrentSlideIndex] = useState(0);
const Footer = () => {
return (
<View style={styles.footer}>
<View style={styles.pagination}>
{slides.map((_, index) => (<View key={index} style={[styles.paginationItem, currentSlideIndex == index && {backgroundColor: 'grey'} ]} /> ))}
</View>
</View>
);
};
return (
<SafeAreaView style={styles.root}>
<FlatList
data={slides}
contentContainerStyle={{flex: 1}}
showsHorizontalScrollIndicator={false}
horizontal
pagingEnabled
renderItem={({item}) => <Slide item={item} />} />
<Footer />
</SafeAreaView>
);
};
export default OnBoardingScreen;
const styles = StyleSheet.create({
root: {
flex: 1,
backgroundColor: COLORS.white,
},
slideView: {
alignItems: 'center',
},
slideImage: {
height: '75%',
width: width,
resizeMode: 'contain',
},
slideTitle: {
color: COLORS.primary,
fontSize: '22',
fontWeight: 'bold',
marginVertical: 10,
paddingHorizontal: 10,
textAlign: 'center',
},
slideDescription: {
fontSize: 18,
paddingHorizontal: 20,
color: 'grey',
textAlign: 'center',
},
footer: {
height: height * 0.25,
paddingHorizontal: 20,
justifyContent: 'space-between',
},
pagination: {
flexDirection: 'row',
justifyContent: 'center',
marginTop: 20,
},
paginationItem: {
height: 10,
width: 10,
backgroundColor: COLORS.primary,
marginHorizontal: 3,
borderRadius: 50,
},
});
App.js
import { StatusBar } from 'expo-status-bar';
import { StyleSheet, Text, View } from 'react-native';
import Navigation from './src/navigation';
export default function App() {
return (
<View style={styles.container}>
<Navigation />
<StatusBar style="auto" />
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
},
});
Update this style
slideView: {
alignItems: 'center',
width: width
},
When adding horizontal={true} to my scrollview, I thought that would be enough to be able to scroll sideways. For some reason, even though there is enough content to scroll to, the images will not scroll continuously. If you copy and paste this code into snack.expo.io you will see what I mean.
I am not sure what is causing this issue, as I know the normal scrollview vertically works fine and scrolls like normal. I have also tried using nestedScrollenabled to true
Any insight at all is appreciated more than you know!
import React, { useState } from 'react';
import {Pressable, StyleSheet, Text, View, useWindowDimensions, Dimensions, Image, Animated, PanResponder,
TouchableOpacity, ScrollView, ImageBackground, Platform} from 'react-native';
import { SearchBar } from 'react-native-elements';
import {
scale,
verticalScale,
moderateScale,
ScaledSheet,
} from 'react-native-size-matters';
import { MaterialCommunityIcons } from '#expo/vector-icons';
const Images = [
{ id: '1', uri: require('./assets/snack-icon.png'), text: 'Test' },
{ id: '2', uri: require('./assets/snack-icon.png') /*text: "Test"*/ },
{ id: '3', uri: require('./assets/snack-icon.png') /*text: "Test"*/ },
{ id: '4', uri: require('./assets/snack-icon.png') /*text: "Test"*/ },
]
const pressableTest = () => {
let textlog = '';
const [state, setState] = useState(0);
};
export default class Home extends React.Component {
renderImagesHorizontal = () => {
return Images.map((item, i) => {
return (
<View
style={{
width : '150%',
paddingLeft: scale(10),
paddingRight: scale(10),
paddingBottom: scale(15),
}}>
<TouchableOpacity
onPress={() => this.props.navigation.navigate('VenueDetails')}>
<ImageBackground
source={item.uri}
style={{
width: '100%',
height: scale(225),
shadowColor: '#000',
shadowOffset: { width: 1, height: 4 },
shadowOpacity: 1,
}}
imageStyle={{ borderRadius: 10 }}>
<View
style={{
position: 'absolute',
bottom: 10,
left: 10,
justifyContent: 'flex-start',
alignItems: 'flex-start',
}}>
<Text style={styles.name}>Name</Text>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Text style={styles.category}>Category</Text>
<Text style={styles.dot}>⬤</Text>
<Text style={styles.money}>$$</Text>
<Text style={styles.dot}>⬤</Text>
<Text style={styles.starRating}>★★★</Text>
</View>
</View>
</ImageBackground>
</TouchableOpacity>
</View>
);
});
};
renderImagesVertical = () => {
return Images.map((item, i) => {
return (
<View style={{ paddingLeft: scale(10), paddingRight: scale(10), paddingBottom: scale(20) }}>
<TouchableOpacity
onPress={() => this.props.navigation.navigate('VenueDetails')}>
<ImageBackground
source={item.uri}
style={{ width:'100%', height: scale(125),
shadowColor: '#000',
shadowOffset: {width: 1, height: 7},
shadowOpacity: 1,}} imageStyle = {{ borderRadius: 20}}>
<View
style={{
position: 'absolute',
bottom: 10,
left: 10,
justifyContent: 'flex-start',
alignItems: 'flex-start',
}}>
<Text style={styles.name}>Name</Text>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Text style={styles.category}>Category</Text>
<Text style={styles.dot}>⬤</Text>
<Text style={styles.money}>$$</Text>
<Text style={styles.dot}>⬤</Text>
<Text style={styles.starRating}>★★★</Text>
</View>
</View>
</ImageBackground>
</TouchableOpacity>
</View>
);
});
};
state = {
search: '',
};
updateSearch = (search) => {
this.setState({ search });
};
render() {
const { search } = this.state;
return (
<ScrollView style={{ flex: 1, backgroundColor: '#272933', horizontal: 'true' }}>
<View style={{flexDirection:'row', marginTop: scale(20)}}>
{/*this will proabbly say somethign different and probably have a different look to it but you get the idea
I was also trying to add a shadow to this but couldnt figure it out. */}
<Text style={{marginTop: scale(30) ,fontSize: scale(40), fontWeight: 'bold', color: '#FFFFFF', paddingLeft: scale(20)}}>
Home
</Text>
<View style={{paddingTop: scale(40), paddingLeft: scale(155)}}>
</View>
</View>
<SearchBar
placeholder="Search..."
onChangeText={this.updateSearch}
value={search}
round='true'
containerStyle={{backgroundColor: '#272933', borderBottomColor: 'transparent', borderTopColor: 'transparent',
paddingLeft: scale(20) , paddingRight: scale(20)}}
inputContainerStyle={{height: scale(30), width: scale(310), backgroundColor: '#3A3B3C'}}
searchIcon={() => <MaterialCommunityIcons name="glass-mug-variant" size={25} color='#87909A'/>}
clearIcon= 'null'
/>
<ScrollView
horizontal={true}
>
<View style={{ flex: 1, flexDirection : 'row', marginTop: 15 }}>{this.renderImagesHorizontal()}</View>
</ScrollView>
<View style={{ flex: 1, marginTop: 15 }}>{this.renderImagesVertical()}</View>
</ScrollView>
);
}
}
const styles = ScaledSheet.create({
starRating: {
color: 'white',
fontSize: '20#s',
textShadowOffset: { width: 2, height: 2 },
textShadowRadius: 2,
textShadowColor: '#000',
},
category: {
color: 'white',
fontSize: '20#s',
textShadowOffset: { width: 2, height: 2 },
textShadowRadius: 2,
textShadowColor: '#000',
},
name: {
fontWeight: 'bold',
color: 'white',
fontSize: '25#s',
textShadowOffset: { width: 2, height: 2 },
textShadowRadius: 2,
textShadowColor: '#000',
},
dot: {
color: 'white',
fontSize: '5#s',
paddingLeft: '5#s',
paddingRight: '5#s',
textShadowOffset: { width: 2, height: 2 },
textShadowRadius: 2,
textShadowColor: '#000',
},
money: {
color: 'white',
fontSize: '20#s',
},
});
in android you must add nestedScrollEnabled={true} to Enables nested scrolling for Android API level 21+. see here
<ScrollView>
<ScrollView nestedScrollEnabled={true}>
</ScrollView>
</ScrollView>
try snack here (test in android & ios not web)
I am trying to build a react native application with the expo, First I try to build this application with my chrome web browser, it was worked without any issue after that I try to test the application with my android device and I'm getting an exception - "Text strings must be rendered within a <Text> component" HomeScreen.js files. I have no idea why this happened. My code as follows,
/*This is an Example of Grid View in React Native*/
// import * as React from "react";
import React from 'react';
import { Image, FlatList, StyleSheet, View, Text, TouchableOpacity, TextInput } from 'react-native';
import { COLORS } from '../../asserts/Colors/Colors';
import { CATEGORIES } from '../../asserts/mocks/itemListData';
import CategoryGridTitle from '../components/HomeGridTile';
import { HeaderButtons, Item } from 'react-navigation-header-buttons';
import { HeaderButton } from '../components/HeaderButton';
import HomeScreenButton from '../components/HomeScreenButton';
//import all the components we will need
const renderTopBarItems = (topBarItems) => {
return (
<TouchableOpacity
style={styles.topBar}>
<Text style={styles.textStyle}> {topBarItems.item.category} </Text>
</TouchableOpacity>
)
}
const HomeScreen = props => {
const renderGridItem = (itemData) => {
return <CategoryGridTitle
title={itemData.item.title}
image={itemData.item.image}
onSelect={() => {
props.navigation.navigate({
routeName: 'PaymentHandlerScreen',
params: {
categoryId: itemData.item.id
}
});
}} />;
}
// const [images, setImages] = React.useState(picsumImages);
return (
<View style={styles.mainBody}>
<View style={styles.searchContainer}>
<TextInput
placeholder='Search'
style={styles.formField}
placeholderTextColor={'#888888'}
/>
<TouchableOpacity onPress={() => props.navigation.navigate('BarCodeScannerScreen')}
style={styles.saveFormField}>
<Image
source={require('../../../images/barcode.png')}
style={{
width: '100%',
height: '30%',
resizeMode: 'contain',
alignContent: 'center',
}}
/> </TouchableOpacity>
</View>
<View style={styles.tabBar}>
<FlatList
horizontal
pagingEnabled={true}
showsHorizontalScrollIndicator={false}
keyExtractor={(item, index) => item.id}
data={CATEGORIES}
renderItem={renderTopBarItems} />
</View>
<FlatList
keyExtractor={(item, index) => item.id}
data={CATEGORIES}
renderItem={renderGridItem}
numColumns={3} />
<HomeScreenButton style={styles.buttonView} />
</View>
);
};
HomeScreen.navigationOptions = navigationData => {
return {
headerTitle: 'Tickets',
headerRight: (
<HeaderButtons HeaderButtonComponent={HeaderButton}>
<Item
title='profile'
iconName='ios-star'
onPress={() => {
console.log('profile clicked');
}} />
<Item
title='more'
iconName='md-more'
onPress={() => {
console.log('more clicked');
}} />
</HeaderButtons>
)
};
};
export default HomeScreen;
const styles = StyleSheet.create({
mainBody: {
flex: 1,
justifyContent: 'center',
backgroundColor: COLORS.background,
paddingTop: '3%',
},
searchContainer: {
flex: 1,
flexDirection: 'row',
},
tabBar: {
paddingBottom: '3%',
},
topBar: {
width: 150,
borderWidth: 1,
borderRadius: 20,
borderColor: COLORS.primary_blue,
padding: '5%',
marginLeft: '5%',
},
textStyle: {
color: COLORS.primary_blue,
textAlign: 'center',
fontWeight: 'bold',
fontSize: 14,
},
formField: {
flex: 4,
borderWidth: 1,
padding: '4%',
marginLeft: '2%',
borderRadius: 10,
borderColor: COLORS.gray,
backgroundColor: COLORS.gray,
fontSize: 15,
height: '35%',
},
saveFormField: {
flex: 0.5,
justifyContent: 'space-between',
alignItems: 'center',
margin: 10,
},
buttonView: {
position: 'absolute',
bottom: 0,
left: 0,
},
});
Thank you.
I ran into this error a couple of times. RN doesn't like extra spaces in tags. try removing the spaces before and after {topBarItems.item.category}
<Text style={styles.textStyle}>{topBarItems.item.category}</Text>
I have an array of items which I have retrieved from an Object. The array has 5 items. It looks like this:
I have saved the array in my state as :
this.state={
serviceDetails: planDetails[0].nbs_plans.map(service => service.extension_attributes.productServicetList.map(name=>name.name)),
}
Now, I am trying to render the array in my component using map function like :
{
this.state.serviceDetails.map((serviceName) => {
return (
<SelectableChips initialChips={serviceName} />
);
})
}
But the problem is all the arrays are coming together at the same place as shown below:
The way it should be is : The first "See more" should be at the first section, the 2nd at the 2nd and so on.
My complete code for this component looks like this:
//This is an example code for FlatList//
import React from 'react';
import {
StyleSheet, FlatList, Text, View, Alert , Image, TouchableOpacity
} from 'react-native';
import SelectableChips from '../../../components/Chip/SelectableChips';
import CheckBox from '../../../components/CheckBox';
import propTypes from 'prop-types';
import Service from './Service';
import { planDetails } from '../../../api/mockedData/PlanServiceDetails';
class Selected_Items_Array {
constructor() {
selectedItemsArray = [];
this.state = {
planName: planDetails[0].nbs_plans.map(data => data.name),
serviceDetails: planDetails[0].nbs_services.map(data => data.service_line),
};
var result = planDetails.filter(d => {
return d.nbs_plans[0].name = "TruComplete℠ Lawn Care Plan";
});
// alert(Object.keys(planDetails).length);
// alert(Object.keys(planDetails[0].nbs_plans).length);
// alert(JSON.stringify(planDetails[0].nbs_plans[0].productId));
// alert(JSON.stringify(planDetails[0].nbs_plans[0].name));
// alert(JSON.stringify(planDetails[0].nbs_plans.map(data => data.name)));
}
pushItem(option) {
selectedItemsArray.push(option);
}
getArray() {
return selectedItemsArray;
}
}
export default class Services extends React.Component {
constructor(props) {
super(props);
this.state = {
// FlatListItems: [
// { id: '1', value: 'TruGreen Mosquito Defense' ,applicationType:'annual' },
// { id: '2', value: 'Sprinkler Maintenance Program' ,applicationType:'first' },
// { id: '3', value: 'Soil Treatment to balance the PH of the lawn-' ,applicationType:'priceper'},
// { id: '4', value: 'Tree & Shrub Care' ,applicationType:'customquote'},
// ],
planName: planDetails[0].nbs_plans.map(data=>data.name),
serviceDetails: planDetails[0].nbs_plans.map(service => service.extension_attributes.productServicetList.map(name=>name.name)),
};
selectedArrayOBJ = new Selected_Items_Array();
alert(JSON.stringify(planDetails[0].nbs_plans.map(data => data.name)));
alert(JSON.stringify(planDetails[0].nbs_plans[0].extension_attributes.productServicetList.map(data=> data.name)));
alert(JSON.stringify(planDetails[0].nbs_plans.map(service => service.extension_attributes.productServicetList.map(name=>name.name))));
alert(this.state.planName);
alert(this.state.serviceDetails);
}
FlatListItemSeparator = () => {
return (
//Item Separator
<View
style={{ height: 7, width: '100%', backgroundColor: 'transparent' }}
/>
);
};
GetItem(item) {
//Function for click on an item
Alert.alert(item);
}
render() {
return (
<View style={styles.MainContainer}>
<FlatList
data={this.state.planName}
//data defined in constructor
ItemSeparatorComponent={this.FlatListItemSeparator}
//Item Separator View
renderItem={({ item }) => (
// Single Comes here which will be repeatative for the FlatListItems
<View style={styles.cellContainerStyle} >
<View backgroundColor = {"transparent"} flexDirection = {'row'} justifyContent= {'flex-start'} margin={0}>
<View backgroundColor={'#73c573'} justifyContent= {'center'} alignItems={'center'} width={35} height={35} marginTop={0} paddingTop={0}>
<View backgroundColor={'#73c573'} width={25} height={25}>
<CheckBox size={25}
keyValue={1}
selectedArrayObject={selectedArrayOBJ}
checked={false}
label = ''
color="transparent"
labelColor="#00703c"
checkBoxClick={this.checkBoxOnClicked}/>
</View>
</View>
<View flex={1.75} backgroundColor={'transparent'} marginLeft={5}>
<Text style={{ color: '#00703c', fontSize: 21, fontFamily: 'SourceSansPro-Bold' }}> {item}</Text>
</View>
<View flex={0.15} marginTop={10}>
<TouchableOpacity style = {{ backgroundColor: 'transparent' }} onPress = {this.props.seeMore} >
<Image source={require('../../../assets/img/iOS/chevron_right.png')} style={styles.rightArrowImageStyle}/>
</TouchableOpacity>
</View>
</View>
<View style={styles.cellSubViewTwo}>
<Text style = {styles.textHeaderStyle}>This plan includes:</Text>
<View backgroundColor = {"transparent"} flexDirection='column' marginTop={5}>
{
this.state.serviceDetails.map((serviceName) => {
return (
<SelectableChips selectedChipStyle={selectableStyles} initialChips={serviceName} onChangeChips={(chips) => console.log(chips)} alertRequired={false} backgroundColor={"transparent"}
subView={
<TouchableOpacity style = {{ backgroundColor: 'transparent' }} onPress = {this.props.seeMore} >
<View backgroundColor={'transparent'} flexDirection = {'row'} alignItems= {'center'} marginLeft={5}>
<Text style={styles.seeMoreStyle}>See more</Text>
<Image source={require('../../../assets/img/iOS/chevron_right.png')} style={styles.rightArrowSeeMoreImageStyle}/>
</View>
</TouchableOpacity>
}/>
);
})
}
</View>
</View>
<Service serviceType={item.applicationType} isButton={false}/>
</View>
)}
/>
</View>
);
}
checkBoxOnClicked() {
if (selectedArrayOBJ.getArray().length == 0) {
//Alert.alert('CheckBox UnChecked');
} else {
// Alert.alert('CheckBox Checked');
}
}
}
Services.propTypes = { seeMore: propTypes.string.isRequired };
const styles = StyleSheet.create({
MainContainer: {
justifyContent: 'center',
margin: 7,
backgroundColor: 'transparent',
},
cellContainerStyle: {
padding: 0,
fontSize: 18,
flexDirection: 'column',
backgroundColor: '#ffffff',
borderColor: 'lightgray',
borderWidth: 0.5,
},
cellSubViewOne: {
flexDirection: 'row',
},
cellSubViewTwo: {
flexDirection: 'column',
marginLeft: 15,
backgroundColor: "#ffffff",
marginTop: 15,
},
cellSubViewThree: {
flexDirection: 'column',
marginLeft: 0,
backgroundColor: "#eff5ef",
marginTop: 15,
},
textHeaderStyle: {
color: '#73c573',
fontSize: 10.5,
fontFamily: "SourceSansPro-SemiBold",
},
rightArrowImageStyle: {
height: 12,
width: 12,
resizeMode: 'center',
alignItems: 'center',
tintColor: '#a6a6a6',
},
rightArrowSeeMoreImageStyle: {
height: 8,
width: 8,
resizeMode: 'center',
alignItems: 'center',
tintColor: '#ff9933',
},
seeMoreStyle: {
fontSize: 11,
color: '#ff9933',
fontFamily: "SourceSansPro-SemiBold",
},
});
const selectableStyles = StyleSheet.create({
chip: {
backgroundColor: '#73c573',
borderColor: '#73c573',
borderWidth: 1,
margin: 3,
padding: 0,
borderRadius: 5,
alignItems: 'center',
justifyContent: 'center',
},
valueStyle: {
color: '#ffffff',
fontSize: 12,
fontFamily: "SourceSansPro-Regular",
},
chipSelected: {
backgroundColor: '#73c573',
borderColor: '#73c573',
borderWidth: 1,
margin: 3,
padding: 0,
borderRadius: 5,
alignItems: 'center',
justifyContent: 'center',
},
valueStyleSelected: {
color: '#ffffff',
fontSize: 12,
fontFamily: "SourceSansPro-Regular",
},
});
Can someone please guide me how to proceed.
As each plan has as productServicetList, create a object serviceDetails where the key is the planName and the value is productServicetList.
this.state={
serviceDetails: planDetails[0].nbs_plans.reduce(
(acc, service) => ({
...acc,
[service.name]: service.extension_attributes.productServicetList.map(
name => name.name
)
}),
{}
);
}
Then render the serviceDetail as follows
{
this.state.serviceDetails[item].map(serviceName => {
return <SelectableChips initialChips={serviceName} />;
});
}
I am using react-native-simple-picker in my app which works fine in my project if I use the default show button but I would like to show the picker when I use a different button in my project. It looks like this.refs.picker.show() in ProposalPicker.js is the function that needs to be called, but I am not sure how to access this from another component file. Currently my code results in the following error - `Cannot read property 'show' of undefined. Appreciate any help.
ProposalPicker.js
import React, { Component } from 'react';
import { Picker, View, Text } from 'react-native';
import Button from './Button';
import SimplePicker from 'react-native-simple-picker';
const options = ['Option1', 'Option2', 'Option3'];
// Labels is optional
const labels = ['Banana', 'Apple', 'Pear'];
class ProposalPicker extends Component {
constructor(props) {
super(props);
this.state = {
selectedOption: '',
};
}
render() {
return (
<View style={styles.container}>
<Text style={styles.paragraph}>Current Option: {this.state.selectedOption}</Text>
<Text
style={{ color: '#006381', marginTop: 20 }}
onPress={() => {
this.refs.picker.show();
}}
>
Click here to select your option
</Text>
<Text
style={{ color: '#006381', marginTop: 20 }}
onPress={() => {
this.refs.picker2.show();
}}
>
Click here to select your option with labels
</Text>
<SimplePicker
ref={'picker'}
options={options}
onSubmit={(option) => {
this.setState({
selectedOption: option,
});
}}
/>
<SimplePicker
ref={'picker2'}
options={options}
labels={labels}
itemStyle={{
fontSize: 25,
color: 'red',
textAlign: 'left',
fontWeight: 'bold',
}}
onSubmit={(option) => {
this.setState({
selectedOption: option,
});
}}
/>
</View>
);
}
}
// class ProposalPicker extends Component {
// state={proposal: ''}
// selectedValue = '';
// updateProposal = (proposal) => {
// this.setState({ proposal: this.selectedValue });
// }
// handleConfirmClick = () => {
// this.setState({ proposal: this.selectedValue });
// }
// render() {
// return (
// <View>
// <Picker selectedValue = {this.selectedValue}
// onValueChange = {this.updateProposal}
// itemStyle={{ backgroundColor: 'grey' }}
// >
// <Picker.Item label = "Test" value = "TestValue1" />
// <Picker.Item label = "Test 1" value = "TestValue2" />
// <Picker.Item label = "Test" value = "TestValue3" />
// <Picker.Item label = "Test" value = "TestValue4" />
// <Picker.Item label = "Test" value = "TestValue5" />
// <Picker.Item label = "Test" value = "TestValue6" />
// <Picker.Item label = "Test" value = "TestValue7" />
// <Picker.Item label = "Test" value = "TestValue8" />
// <Picker.Item label = "Test nothing" value = "TestValue9" />
// </Picker>
// <Text style = {styles.textStyle}>CONFIRM</Text>
// </View>
// )
// }
// }
const styles = {
proposalPickerStyle: {
backgroundColor: 'lightgrey'
},
textStyle: {
flex: 1
}
}
export default ProposalPicker;
ProposalPickerButton.js
import React from 'react';
import { View, Text, Image, TouchableOpacity } from 'react-native';
const PickerButton = ({ onPress, text }) => {
const { textStyle, iconStyle, iconContainerStyle, textContainerStyle, buttonStyle } = styles;
return (
<TouchableOpacity onPress={onPress} style={buttonStyle}>
<View style={styles.containerStyle}>
<View style={iconContainerStyle}>
<Image
style={iconStyle}
source={require('./images/201.png')}
/>
</View>
<View style={textContainerStyle}>
<Text style={textStyle}>{text}</Text>
</View>
<View style={iconContainerStyle}>
<Image
style={iconStyle}
source={require('./images/201.png')}
/>
</View>
</View>
</TouchableOpacity>
);
}
const styles = {
containerStyle: {
flex: 1,
//backgroundColor: 'red',
borderWidth: 2,
borderRadius: 0,
borderColor: '#FFFFFF',
//shadowColor: '#000',
//shadowOffset: { width: 0, height: 2 },
//shadowOpacity: 0.1,
//shadowRadius: 2,
//elevation: 1,
marginLeft: 40,
marginRight: 40,
marginTop: 10,
marginBottom: 10,
justifyContent: 'center',
alignItems: 'center',
flexDirection: 'row'
},
iconContainerStyle: {
flex: 2,
//backgroundColor: 'blue',
justifyContent: 'center',
//alignItems: 'center',
//width: '20%',
//height: '20%'
},
iconStyle: {
flex: 1,
width: null,
height: null,
resizeMode: 'contain',
marginLeft: 10,
marginRight: 10,
marginTop: 10,
marginBottom: 10
},
textContainerStyle: {
flex: 8,
//backgroundColor: 'orange',
alignItems: 'flex-start',
justifyContent: 'center',
},
textStyle: {
fontSize: 20,
fontWeight: 'bold',
color: '#FFFFFF',
//marginLeft: 10
//padding: 18
},
buttonStyle: {
width: '100%',
height: '100%'
}
};
export default PickerButton;
App.js
import React, { Component } from 'react';
import { View, Text, ImageBackground } from 'react-native';
import Logo from './Logo';
import ProposalPickerButton from './ProposalPickerButton';
import Button from './Button';
import ProposalPicker from './ProposalPicker';
import SimplePicker from 'react-native-simple-picker';
class App extends Component {
render() {
return (
<ImageBackground
source={require('./images/city.png')}
style={styles.backgroundStyle}
>
<View style={styles.backgroundOverlayStyle} />
<View style={styles.container}>
<View style={styles.logoContainer}>
<Logo />
</View>
<View style={styles.proposalPickerButtonStyle}>
<ProposalPickerButton
onPress={() => new ProposalPicker().refs.picker.show()}
// onPress={() => console.log('Proposal picker button pressed')}
//onPress={() => Linking.openURL(url)}
text="Select a service line"
/>
</View>
<View style={styles.startProposalButtonStyle}>
<Button text="Start proposal"/>
</View>
<View style={styles.proposalPickerStyle}>
{/* <ProposalPicker /> */}
</View>
</View>
</ImageBackground>
);
}
}
const styles = {
backgroundStyle: {
flex: 1,
backgroundColor: '#000000',
width: '100%',
height: '100%',
position: 'absolute'
},
backgroundOverlayStyle: {
flex: 1,
position: 'absolute',
backgroundColor: '#003284',
opacity: 0.5,
width: '100%',
height: '100%'
},
container: {
//backgroundColor: 'red',
flex: 1,
//opacity: 0.5,
alignItems: 'center',
width: '100%',
height: '65%',
},
logoContainer: {
//backgroundColor: 'blue',
flex: 3,
alignItems: 'center',
justifyContent: 'center',
width: '100%',
height: '65%',
},
proposalPickerButtonStyle: {
flex: 1,
//backgroundColor: 'yellow',
alignItems: 'center',
justifyContent: 'center',
width: '100%',
height: '100%',
marginLeft: 100,
marginRight: 100
},
startProposalButtonStyle: {
flex: 1,
//backgroundColor: 'purple',
width: '100%',
height: '100%',
marginTop: 10,
marginRight: 80
},
proposalPickerStyle: {
opacity: 1,
flex: 2,
backgroundColor: 'green',
width: '100%',
height: '100%'
},
};
export default App;
To call methods via refs you need to have a ref assigned to an already mounted component. Therefore you can't say new ProposalPicker().refs.picker.show() because refs.picker does not exist until the component is mounted. You Should have your button and picker components in the same parent, that way you can easily create a ref in that parent, assign it, and call methods from it:
Also you should use callback refs instead of string refs because string refs are deprecated. In that case it would look like:
constructor(props){
super(props)
this.state = ...
this.picker = React.createRef() // make the ref
}
Then assign the ref:
<SimplePicker
ref={this.picker}
And then you can make an function to call when your button is pressed:
showPicker = () => {
if (this.picker.current) {
this.picker.current.show()
}
}