This is an example to show the Use of FlatList Component in React Native. React Native FlatList is a simple ListView. It is among the simple but mostly used components. Here is the example of FlatList which will be helpful for you to understand how to use it. You can also check SectionList example for the Section list.
To Import FlatList in Code
1 | import { FlatList} from 'react-native' |
Render FlatList Using
1 2 3 4 5 6 7 8 9 10 11 | <FlatList data={ <strong>Data To Be Set in List</strong> } ItemSeparatorComponent={ <strong>An Separator View</strong> } renderItem={({ item }) => (<strong>Single Item View</strong>) } /> |
In this example, We will make a simple list which will have A to Z as items and will show an alert with the item id and name while clicking on the single item of the FlatList. So let’s get started.
To Make a React Native App
Getting started with React Native will help you to know more about the way you can make a React Native project. We are going to use react-native init to make our React Native App. Assuming that you have node installed, you can use npm to install the react-native-cli command line utility. Open the terminal and go to the workspace and run
npm install -g react-native-cliRun the following commands to create a new React Native project
react-native init ProjectNameIf you want to start a new project with a specific React Native version, you can use the --version argument:
react-native init ProjectName --version X.XX.Xreact-native init ProjectName --version react-native@nextThis will make a project structure with an index file named App.js in your project directory.
Open App.js in any code editor and replace the code with the following code.
App.js
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | //This is an example code for FlatList// import React from 'react'; //import react in our code. import { StyleSheet, FlatList, Text, View, Alert } from 'react-native'; //import all the components we are going to use. export default class App extends React.Component { constructor(props) { super(props); this.state = { FlatListItems: [ { id: '1', value: 'A' },{ id: '2', value: 'B' },{ id: '3', value: 'C' }, { id: '4', value: 'D' },{ id: '5', value: 'E' },{ id: '6', value: 'F' }, { id: '7', value: 'G' },{ id: '8', value: 'H' },{ id: '9', value: 'I' }, { id: '10', value: 'J' },{ id: '11', value: 'K' },{ id: '12', value: 'L' }, { id: '13', value: 'M' },{ id: '14', value: 'N' },{ id: '15', value: 'O' }, { id: '16', value: 'P' },{ id: '17', value: 'Q' },{ id: '18', value: 'R' }, { id: '19', value: 'S' },{ id: '20', value: 'T' },{ id: '21', value: 'U' }, { id: '22', value: 'V' },{ id: '23', value: 'W' },{ id: '24', value: 'X' }, { id: '25', value: 'Y' },{ id: '26', value: 'Z' }], }; } FlatListItemSeparator = () => { return ( //Item Separator <View style={{height: 0.5, width: '100%', backgroundColor: '#C8C8C8'}}/> ); }; GetItem(item) { //Function for click on an item Alert.alert(item); } render() { return ( <View style={styles.MainContainer}> <FlatList data={this.state.FlatListItems} //data defined in constructor ItemSeparatorComponent={this.FlatListItemSeparator} //Item Separator View renderItem={({ item }) => ( // Single Comes here which will be repeatative for the FlatListItems <View> <Text style={styles.item} onPress={this.GetItem.bind(this, 'Id : '+item.id+' Value : '+item.value)}> {item.value} </Text> </View> )} keyExtractor={(item, index) => index.toString()} /> </View> ); } } const styles = StyleSheet.create({ MainContainer: { justifyContent: 'center', flex: 1, marginLeft: 10, marginRight: 10, marginBottom: 10, marginTop: 30, }, item: { padding: 10, fontSize: 18, height: 44, }, }); |
To Run the React Native App
Open the terminal again and jump into your project using.cd ProjectNamereact-native run-androidreact-native run-ios (macOS only).IOS
This is how you can use FlatList component in React Native. If you have any doubt or you want to share something about the topic you can comment below or contact us here. There will be more posts coming soon. Stay tuned!
Hope you liked it. 🙂
how can we update single item
You just need to change the FlatListItems array and state, the updated value will be reflected automatically.