Use of FlatList Component in React Native

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

import { FlatList} from 'react-native'

1	import { FlatList} from 'react-native'

Render FlatList Using

<FlatList
    data={
        <strong>Data To Be Set in List</strong>
    }
    ItemSeparatorComponent={
        <strong>An Separator View</strong>
    }
    renderItem={({ item }) =>
        (<strong>Single Item View</strong>)
    }
/>

<FlatList

data={

Data To Be Set in List

}

ItemSeparatorComponent={

An Separator View

}

renderItem={({ item }) =>

(Single Item View)

}

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-cli

Run the following commands to create a new React Native project

react-native init ProjectName

This 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

//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,
  },
});

//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

);

};

GetItem(item) {

//Function for click on an item

Alert.alert(item);

}

render() {

return (

<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 ProjectName

To run the project on an Android Virtual Device or on real debugging device

react-native run-android

or on the iOS Simulator by running

react-native run-ios (macOS only).

IOS

ANDROID

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. 🙂

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