making a virtualized list with a separate file in react - reactjs

I created a to do list app in app.js and a virtualized list in VirtualizedList.js but none of the virtualized list code is displaying although I imported it into app.js properly.
Here is the VirtualizedList.js code.
import React from 'react';
import { SafeAreaView, View, VirtualizedList, StyleSheet, Text,
StatusBar } from 'react-native';
const DATA = [];
const getItem = (data, index) => ({
id: Math.random().toString(12).substring(0),
title: `Item ${index+1}`
});
const getItemCount = (data) => 50;
const Item = ({ title }) => (
<View style={styles.item}>
<Text style={styles.title}>{title}</Text>
</View>
);
const App = () => {
return (
<SafeAreaView style={styles.container}>
<VirtualizedList
data={DATA}
initialNumToRender={4}
renderItem={({ item }) => <Item title={item.title} />}
keyExtractor={item => item.key}
getItemCount={getItemCount}
getItem={getItem}
/>
</SafeAreaView>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
marginTop: StatusBar.currentHeight,
},
item: {
backgroundColor: '#f9c2ff',
height: 100,
justifyContent: 'center',
marginVertical: 7,
marginHorizontal: 24,
padding: 20,
},
title: {
fontSize: 25,
},
});
export default App;
This is how I imported VirtualizedList into app.js:
import VirtualizedList from '/Users/myname/Applications/todo-
app/src/components/VirtualizedList';

Normally you would export default your list in VirtualizedList.js and you would import them in your App.js (renderer) as a normal object. But I would have to see the code to be sure

Related

TypeError: text.toLowerCase is not a function. (In 'text.toLowerCase()', 'text.toLowerCase' is undefined)

I am doing a project using MERN STACK in this I faced the above error.
ProductContainer.js
import React, { useState, useEffect } from 'react'
import { View, StyleSheet, ActivityIndicator, FlatList, Text} from 'react-native'
import { Container, Header, Icon, Item, Input } from 'native-base';
import ProductList from './ProductList';
import SearchedProduct from './SearchedProducts';
const data = require('../../assets/data/products.json');
const ProductContainer = () => {
const [products, setProducts ] = useState([]);
const [productsFiltered, setProductsFiltered] = useState([]);
const [focus, setFocus] = useState();
useEffect(() => {
setProducts(data);
setProductsFiltered(data);
setFocus(false);
return () => {
setProducts([])
setProductsFiltered([])
setFocus()
}
}, [])
const SearchProduct = (text) => {
setProductsFiltered(
products.filter((i) => i.name.toLowerCase().includes(text.toLowerCase()))
);
};
const openList = () => {
setFocus(true);
};
const onBlur = () => {
setFocus(flase);
};
return (
<Container>
<View style = {{ flexDirection: "row"}}>
<Input
width = "100%"
variant = "rounded"
placeholder="Search"
onFocus={openList}
onChangeText={(text) => SearchProduct(text)}
/>
</View>
{focus == true ? (
<SearchProduct
productsFiltered={productsFiltered}
/>
) : (
<View style={styles.container}>
<Text>Product Container</Text>
<View style={styles.listContainer}>
<FlatList
data={products}
numColumns={2}
renderItem={({item}) => <ProductList
key={item.brand}
item={item}/>}
keyExtractor={item => item.brand}
/>
</View>
</View>
)}
</Container>
)
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff',
alignItems: 'center',
justifyContent: 'center',
},
});
export default ProductContainer
SearchedProducts.js
import React from 'react';
import { View, StyleSheet, Dimensions} from 'react-native'
import { Content, Left, Body, ListItem, Thumbnail, Text } from 'native-base';
const SearchedProduct = (props) => {
const { productsFiltered } = props;
return(
<Content >
{productsFiltered.length > 0 ? (
productsFiltered.map((item) => (
<ListItem
key={item._id.$oid}
avatar
>
<Left>
<Thumbnail
source={{uri: item.image ?
item.image : 'https://cdn.pixabay.com/photo/2012/04/01/17/29/box-23649_960_720.png'
}}
/>
</Left>
<Body>
<Text>{item.name}</Text>
<Text note>{item.description}</Text>
</Body>
</ListItem>
))
) : (
<View style={styles.center}>
<Text style={{ alignSelf: 'center' }}>
No products match the selected criteria
</Text>
</View>
)}
</Content>
);
};
const styles = StyleSheet.create({
center: {
justifyContent: 'center',
alignItems: 'center',
height: 100
}
})
export default SearchedProduct;
Please can anyone help me to solve this error .If you want I will provide other details of my code.
Thanks in advance
Not sure but you are using SearchProduct name as a component and at the same time as a method. Maybe try to rename changing either component name or method name to see if it works.

How to do a loop for cards

how do i do a loop for 10 cards? Cant find any solution anywhere.
I need it to output cards with some info which ill specify later. I am new to React Native and got no idea what Im doing. It worked when ive written return into the loop, but it returned just one card (better than none I guess).
import * as React from 'react';
import { StyleSheet, ScrollView, View, Text, Image } from 'react-native';
import { Card, CardTitle, CardContent, CardAction, CardButton, CardImage } from 'react-native-material-cards'
export default function Primary({ navigation })
{
return(
<ScrollView style=
{{
flex: 1,
}}>
<View>
<Text style={{ fontSize: 26, fontWeight: 'bold' }}>
Hlavni
</Text>
<Text>Ahojda</Text>
</View>
<Text>Swag</Text>
<KartyLoop/>
</ScrollView>
);
}
const KartyLoop = () => {
var swag[];
for (i=0; i<5; i++)
{
<View>
<Card style={{borderRadius: 25}}>
<CardTitle
title="This is a title"
subtitle="This is subtitle"
/>
<CardContent text="Your device will reboot in few seconds once successful, be patient meanwhile" />
<CardAction
separator={true}
inColumn={false}>
<CardButton
onPress={() => {}}
title="Push"
color="blue"
/>
<CardButton
onPress={() => {}}
title="Later"
color="blue"
/>
</CardAction>
</Card>
</View>
}
return();
}
When rendering a list of components in react native, you need to put them in some sort of list.
Try wrapping the code inside your <View> with <Flatlist>
Docs: https://reactnative.dev/docs/flatlist
Full example from docs:
import React from 'react';
import { SafeAreaView, View, FlatList, StyleSheet, Text, StatusBar } from 'react-native';
const DATA = [
{
id: 'bd7acbea-c1b1-46c2-aed5-3ad53abb28ba',
title: 'First Item',
},
{
id: '3ac68afc-c605-48d3-a4f8-fbd91aa97f63',
title: 'Second Item',
},
{
id: '58694a0f-3da1-471f-bd96-145571e29d72',
title: 'Third Item',
},
];
const Item = ({ title }) => (
<View style={styles.item}>
<Text style={styles.title}>{title}</Text>
</View>
);
const App = () => {
const renderItem = ({ item }) => (
<Item title={item.title} />
);
return (
<SafeAreaView style={styles.container}>
<FlatList
data={DATA}
renderItem={renderItem}
keyExtractor={item => item.id}
/>
</SafeAreaView>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
marginTop: StatusBar.currentHeight || 0,
},
item: {
backgroundColor: '#f9c2ff',
padding: 20,
marginVertical: 8,
marginHorizontal: 16,
},
title: {
fontSize: 32,
},
});
export default App;

React Native Remove Item and button

I want when I click button inside access file remove the same item in months array inside Home file.
How can I solve this?
App.js
this file conncet screen.
import {StyleSheet, View} from 'react-native';
import {createStackNavigator} from '#react-navigation/stack';
import Home from './src/components/Home';
import {NavigationContainer} from '#react-navigation/native';
import Access from './src/components/access';
const Stack = createStackNavigator();
const App = () => {
return (
<NavigationContainer>
<Stack.Navigator>
<Stack.Screen name="Home" component={Home} />
<Stack.Screen name="access" component={Access} />
</Stack.Navigator>
</NavigationContainer>
);
};
export default App;
ButtonCicle.js
this file make circle.
import { View, Text,TouchableOpacity } from 'react-native';
import styles from './Styles/ButtonCircleStyles';
export default function ButtonCicle({BtnName, onPress}) {
return (
<TouchableOpacity style={styles.buttonContainer} onPress={onPress}>
<Text style={styles.button}>{BtnName}</Text>
</TouchableOpacity>
);
}
ButtonCircleStyles.js
this file make style
import {StyleSheet, Dimensions} from 'react-native';
const height = Dimensions.get('window').height;
const width = Dimensions.get('window').width;
const styles = StyleSheet.create({
buttonContainer:
{
backgroundColor: 'red',
borderRadius: 50,
width: width / 5,
height: width / 5,
justifyContent: 'center',
marginStart: '4%',
marginBottom: '4%',
},
button:
{
fontSize: 25,
textAlign: 'center',
},
});
export default styles;
Home.js
this file make array and onPress to another screen
import React from 'react';
import {StyleSheet, View} from 'react-native';
import ButtonCicle from './ButtonCircle';
const Home = ({navigation}) => {
const months = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
const listbutton = months.map((i, key) => (
<ButtonCicle
BtnName={i}
key={key}
onPress={() => navigation.navigate('access') || alert(i)}
/>
));
return (
<>
<View style={styles.container}>{listbutton}</View>
</>
);
};
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#ecf0f1',
padding: 8,
marginTop: '10%',
flexDirection: 'row',
height: 300,
flexWrap: 'wrap',
},
});
export default Home;
access.js
import React from 'react'
import { View, Text, Button } from 'react-native'
export default function access({navigation}) {
return (
<View>
<Text>Home</Text>
<Button title='Click' onPress={() => navigation.navigate('Home')} />
</View>
)
}
I want when I click button inside access file remove the same item in months array inside Home file.
How can I solve this?
How create it ?
You can try with a callback. Define a function inside Home.js that remove the element from the array. Then you could pass this callback as a route param
navigation.navigate('access', {deleteItem: //your callback})
And in the access.js file you get this callback
const deleteItem = navigation.getParam('deleteItem');
And call it before navigate back to home
const onPress = () => {
deleteItem();
navigation.navigate('Home');
}
<Button title='Click' onPress={onPress} />

React native how to animate view opening up->down

Consider the following component where the user selects an option from a list:
import React, { Component } from "react";
import PropTypes from "prop-types";
import {
View,
Text,
StyleSheet,
Platform,
FlatList,
TouchableNativeFeedback,
TouchableOpacity,
PLatform
} from "react-native";
import Icon from "react-native-vector-icons/Ionicons";
import { colors, metrics } from "../../themes";
const Touchable =
Platform.OS === "android" ? TouchableNativeFeedback : TouchableOpacity;
class MenuSelector extends Component<{
onSelect: () => any,
config: object,
selected: string
}> {
state = {
listOpened: false
};
handlePress = id => {
this.props.onPress(id);
};
handleSelect = id => {
if (this.props.onSelect) this.props.onSelect(id);
this.setState({
listOpened: false
});
};
handleMenu = () => {
this.setState({
listOpened: !this.state.listOpened
});
};
render = () => {
let title = "";
if (this.props.config) {
title = this.props.config[0].title;
if (this.props.selected) {
let found = this.props.config.find(item => {
return item.id === this.props.selected;
});
if (found) title = found.title;
}
}
let top = (
<View style={styles.header}>
<Text style={styles.text}>{title}</Text>
<Touchable>
<Text style={styles.text}>
<Icon
name={"ios-menu"}
size={20}
onPress={this.handleMenu}
/>
</Text>
</Touchable>
</View>
);
let list = null;
if (this.state.listOpened === true) {
list = (
<FlatList
data={this.props.config}
renderItem={({ item }) => (
<Touchable onPress={this.handleSelect}>
<Text style={[styles.text, styles.listItem]}>{item.title}</Text>
</Touchable>
)}
/>
);
}
return (
<View style={styles.container}>
{top}
{list}
</View>
);
};
}
export default MenuSelector;
const styles = StyleSheet.create({
container: {
flex: -1,
flexDirection: "column"
},
header: {
flex: -1,
flexDirection: "row",
justifyContent: "space-between",
padding: 10,
backgroundColor: "blue"
},
text: {
fontSize: 16,
color: "white",
textAlign: "center",
fontWeight: "bold"
},
listItem: {
padding: 10,
backgroundColor: "blue"
}
});
The component is used in the following context:
let config = [
{
title="Option 1",
id="option1"
},
{
title="Option 2",
id="option2"
},
{
title="Option 3",
id="option3"
},
{
title="Option 4",
id="option4"
},
];
return (
<View style={styles.container}>
<MenuSelector
config={config.options}
selected={this.state.mode}
onPress={this.handleButtonListPress}
/>
<FlatList
data={this.props.data}
keyExtractor={(item, index) => index.toString()}
renderItem={({ item }) => (
<Text style={styles.text}>{item.name}</Text>
)}
/>
</View>
);
As it is, the <MenuSelector> component appears "at once" on screen. I need to add an sliding effect to <MenuSelector>, "pushing down" the data FlatList when appearing on screen...
On closing, same behaviour, but animating from down to up.
How can I add such animation behaviour to my MenuSelector component ?

cant find variable props

I am trying to show the detail view when user taps on one of the list item. When the user taps on the listitem, I get an error saying Undefined is not an object
evaluating 'this.props.services.ser. Below is the screen shot of the error:
My list item page code is below:
import React, { Component } from 'react';
import { Text, View, StyleSheet, ListView } from 'react-native';
import { Provider, connect } from 'react-redux';
import { createStore } from 'redux'
import reducers from '../reducers/ServiceReducer';
import ServiceItem from './ServiceItem';
import Icon from 'react-native-vector-icons/EvilIcons';
import ServiceDetail from './ServiceDetail';
const styles = StyleSheet.create({
container: {
flex: 1,
width: 353,
flexWrap: 'wrap',
paddingTop: 20,
paddingLeft: 20,
},
});
const store = createStore(reducers);
class AutoCompActivity extends Component {
renderInitialView() {
const ds = new ListView.DataSource({
rowHasChanged: (r1, r2) => r1 !== r2,
});
this.dataSource = ds.cloneWithRows(this.props.services);
if (this.props.detailView === true) {
return (
<ServiceDetail />
);
} else {
return (
<ListView
enableEmptySections={true}
dataSource={this.dataSource}
renderRow={(rowData) =>
<ServiceItem services={rowData} />
}
/>
);
}
}
render() {
return (
<View style={styles.container}>
{this.renderInitialView()}
</View>
);
}
}
const mapStateToProps = state => {
return {
services: state.services,
detailView: state.detailView,
};
};
const ConnectedAutoCompActivity = connect(mapStateToProps)(AutoCompActivity);
const app1 = () => (
<Provider store={store}>
<ConnectedAutoCompActivity />
</Provider>
)
export default app1;
Each item that I display to the user is defined in js class serviceItem.js. Below is the code for serviceItem.js. I put the entire code inside TouchableWithoutFeedback. This is when I am getting an error when user taps on one of the listItem. I looked at this code several times, but could not figure out where I am doing wrong
import React from 'react';
import { Text, View, StyleSheet, Image, TouchableWithoutFeedback } from 'react-native';
import { connect } from 'react-redux';
import { getTheme } from 'react-native-material-kit';
import Icon from 'react-native-vector-icons/EvilIcons';
import * as actions from '../actions';
const theme = getTheme();
const styles = StyleSheet.create({
card: {
marginTop: 20,
},
title: {
top: 20,
left: 80,
fontSize: 24,
},
image: {
height: 100,
},
action: {
backgroundColor: 'black',
color: 'white',
},
icon: {
position: 'absolute',
top: 15,
left: 0,
color: 'white',
backgroundColor: 'rgba(255,255,255,0)',
},
});
const ServiceItem = (props) => {
return (
<TouchableWithoutFeedback
onPress={() => props.selectServices(props.services)}
>
<View style={[theme.cardStyle, styles.card]}>
<Text >{props.services.ser} </Text>
</View>
</TouchableWithoutFeedback>
);
};
const mapStateToProps = state => {
return {
selectServices: state.selectServices,
services: state.services
};
};
export default connect(mapStateToProps, actions)(ServiceItem);
When the user taps on each listitem. I am calling the class ServiceDetail.js. Below is the code for serviceDetail.js class:
/**
* Sample React Native App
* https://github.com/facebook/react-native
* #flow
*/
import React, { Component } from 'react';
import { Text, View, StyleSheet, Image, ScrollView, TouchableOpacity, Linking } from 'react-native';
import { connect } from 'react-redux';
import { getTheme } from 'react-native-material-kit';
import EvilIcon from 'react-native-vector-icons/EvilIcons';
import MaterialIcon from 'react-native-vector-icons/MaterialIcons';
import SimpleIcon from 'react-native-vector-icons/SimpleLineIcons';
import * as actions from '../actions';
const theme = getTheme();
const styles = StyleSheet.create({
card: {
marginTop: 10,
paddingBottom: 20,
marginBottom: 20,
borderColor: 'lightgrey',
borderWidth: 0.5,
},
title1: {
top: 10,
left: 80,
fontSize: 24,
},
title2: {
top: 35,
left: 82,
fontSize: 18,
},
image: {
flex: 0,
height: 100,
width: 333,
backgroundColor: 'transparent',
justifyContent: 'center',
alignItems: 'center',
},
closeIcon: {
position: 'absolute',
top: 5,
left: 295,
color: 'rgba(233,166,154,0.8)',
backgroundColor: 'rgba(255,255,255,0)',
},
icon: {
position: 'absolute',
top: 15,
left: 0,
color: 'white',
backgroundColor: 'rgba(255,255,255,0)',
},
textArea: {
flexDirection: 'row',
paddingLeft: 20,
paddingTop: 10,
width: 260,
},
textIcons: {
color: '#26a69a',
},
actionArea: {
paddingTop: 10,
flexDirection: 'row',
justifyContent: 'space-around',
alignItems: 'center',
},
});
class ServiceDetail extends Component {
handleClick = (link) => {
Linking.canOpenURL(link).then(suppported => {
if (supported) {
Linking.openURL(link);
} else {
console.log('Don\'t know how to open URI: ' + link);
}
});
};
render() {
return (
<ScrollView showsVerticalScrollIndicator={false}>
<View style={[theme.cardStyle, styles.card]}>
<Image
source={require('../images/background.jpg')}
style={[theme.cardImageStyle, styles.image]}
/>
<EvilIcon name={'user'} size={100} style={styles.icon}/>
<SimpleIcon name={'close'} size={30} style={styles.closeIcon}
onPress={() => this.props.noneSelected()} />
<Text style={[theme.cardTitleStyle, styles.title1]}>{this.props.services.ser}</Text>
<Text style={[theme.cardTitleStyle, styles.title2]}>from {this.props.services.Location}</Text>
<Text style={[theme.cardTitleStyle, styles.title2]}>from {this.props.services.SecondLoc}</Text>
<View style={styles.textArea}>
<MaterialIcon name={'phone'} size={40} style={styles.textIcons}/>
<Text style={theme.cardContentStyle}>{this.props.services.Phone}</Text>
</View>
<View style={styles.textArea}>
<MaterialIcon name={'email'} size={40} style={styles.textIcons}/>
<Text style={theme.cardContentStyle}>{this.props.services.email}</Text>
</View>
<View style={styles.actionArea}>
<Text>Call</Text>
<Text>Email</Text>
</View>
</View>
</ScrollView>
);
}
}
const mapStateToProps = state => {
return {
service: state.serviceSelected,
};
};
export default connect(mapStateToProps, actions)(ServiceDetail);
My index.js class has the following code under actions folder:
export const selectServices = (serviceId) => {
return {
type: 'SELECTED_SERVICE',
payload: serviceId,
};
};
export const noneSelected = () => {
return {
type: 'NONE_SELECTED',
};
};
My serviceReducer has the following code:
import services from './services.json';
const initialState = {
services,
detailView: false,
serviceSelected: null,
};
export default (state = initialState, action) => {
switch (action.type) {
case 'SELECTED_SERVICE':
return {
...state,
detailView: true,
serviceSelected: action.payload
}
case 'NONE_SELECTED':
return {
...state,
detailView: false,
serviceSelected: null,
}
default:
return state;
}
}
I am developing this application on windows machine on android emulator. I know I am missing something. I looked at each and every line, but could not figure out what am I doing wrong. I am new to react native and trying to follow the example to make this app. I tried to debug the application using chrome, but keep getting an error that could not connect to remote debugging.
any help will be highly appreciated.
I see you pass props and use it to your const ServiceItem. You need to use mapStateToProps also then pass to your connect at serviceItem.js.
const mapStateToProps = state => {
return {
selectServices: state.selectServices,
services: state.services
};
};
export default connect(mapStateToProps, actions)(ServiceItem);
Your ServiceDetail.js also should be:
const mapStateToProps = state => {
return {
services: state.services
};
};
export default connect(mapStateToProps, actions)(ServiceDetail);
Your ServiceItem component is just a presentational component, in my opinion, it need not to be connected to redux store, instead, pass the data and event hook from parent to ServiceItem component and that will work just fine. That will solve your props problem as well.
Point made by "DennisFrea" still holds good. i am just suggesting another of achieving the same thing.

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