Here is an example of React Native Scroll Up or Down the ListView on the Click of Button. We have often seen this type of things in websites where you scroll towards the button and suddenly a button pop up to take you at the top of the page. It provides a very good user experience. So here is the same example with the React Native ListView.
We have made two buttons
1. To take you to the Top of the ListView by using :
1 | this.ListView_Ref.scrollTo({ x: 0, y: 0, animated: true }); |
2. To take you to the Bottom of the ListView by using :
1 | this.ListView_Ref.scrollToEnd({ animated: true }); |
We are using a simple React Native ListView for this example. 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
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 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 | //This is an example code to Scroll Up or Down ListView on Button Click// import React, { Component } from 'react'; //import react in our code. import { StyleSheet, View, Alert, ListView, Text, TouchableOpacity, Image, } from 'react-native'; //import all the components we are going to use. export default class Mynewproject extends Component { constructor(props) { super(props); //Preparing the data for the ListView const ds = new ListView.DataSource({ rowHasChanged: (r1, r2) => r1 !== r2, }); this.state = { dataSource: ds.cloneWithRows([ 'Chinkara', 'MotorsForce', 'MotorsIPMLHindustan', 'Mahindra', 'Reva', 'Electric', 'VehiclesMaruti', 'Suzuki', 'IndiaOpel', 'IndiaPremier', 'LtdSan', 'StormSML', 'IsuzuStandardTara', 'InternationalTata', 'Motor', 'Chinkara', 'MotorsForce', 'MotorsIPMLHindustan', 'Mahindra', 'Reva', 'Electric', 'VehiclesMaruti', 'Suzuki', 'IndiaOpel', 'IndiaPremier', 'LtdSan', 'StormSML', 'IsuzuStandardTara', 'InternationalTata', 'Motor', ]), }; } ListViewItemSeparator = () => { return ( <View style={{ height: 0.5, width: '100%', backgroundColor: '#000', }} /> ); }; GetListViewItem(rowData) { Alert.alert(rowData); } upButtonHandler = () => { //OnCLick of Up button we scrolled the list to top this.ListView_Ref.scrollTo({ x: 0, y: 0, animated: true }); }; downButtonHandler = () => { //OnCLick of down button we scrolled the list to bottom this.ListView_Ref.scrollToEnd({ animated: true }); }; render() { return ( <View style={styles.MainContainer}> <ListView dataSource={this.state.dataSource} renderSeparator={this.ListViewItemSeparator} ref={c => {this.ListView_Ref = c;}} renderRow={rowData => ( <Text style={styles.rowViewContainer} onPress={this.GetListViewItem.bind(this, rowData)}> {rowData} </Text> )} /> <TouchableOpacity activeOpacity={0.5} onPress={this.downButtonHandler} style={styles.downButton}> <Image //We have used online images you can use from the local folder as well source={{uri:'http://aboutreact.com/wp-content/uploads/2018/08/arrow_down.png',}} style={styles.downButtonImage} /> </TouchableOpacity> <TouchableOpacity activeOpacity={0.5} onPress={this.upButtonHandler} style={styles.upButton}> <Image //We have used online images you can use from the local folder as well source={{uri:'http://aboutreact.com/wp-content/uploads/2018/08/arrow_up.png',}} style={styles.upButtonImage} /> </TouchableOpacity> </View> ); } } const styles = StyleSheet.create({ MainContainer: { justifyContent: 'center', flex: 1, margin: 10, paddingTop: 40, }, rowViewContainer: { fontSize: 18, paddingRight: 10, paddingTop: 10, paddingBottom: 10, }, upButton: { position: 'absolute', width: 50, height: 50, alignItems: 'center', justifyContent: 'center', right: 30, bottom: 70, }, upButtonImage: { resizeMode: 'contain', width: 30, height: 30, }, downButton: { position: 'absolute', width: 50, height: 50, alignItems: 'center', justifyContent: 'center', right: 30, top: 70, }, downButtonImage: { resizeMode: 'contain', width: 30, height: 30, }, }); |
To Run the React Native App
Open the terminal again and jump into your project using.
This is how you can Scroll Down/up in ListView. 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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