This is an Example to create a React Native Tree View using react-native-final-tree-view for Android and IOS devices. A Tree View is simple a hierarchical view which is used to show the parent-child relationship between the data. You can simply understand the Tree View using the following image. In the below image the yellow ball is the parent and green ones are the children of the yellow ball. Please remember tree structure has no child limit so green children can also have the child and there can be more child under them.
In this example, we will see how to create a TreeView in React Native. So let’s get started.
We are going to use TreeView component from react-native-final-tree-view library.
Import TreeView using
1 | import TreeView from 'react-native-final-tree-view'; |
To Show TreeView
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 | <TreeView //reference for the tree view ref={ref => (this.treeView = ref)} //Setting the data for the Tree View data={this.state.data} //on long press delete the item //but you have to remove onItemLongPress to work this deleteOnLongPress //on press of any element onItemPress={(node, level) => { alert('Level: ' + level + '\n' + 'Node: ' + JSON.stringify(node)); }} //on long press of a tree element onItemLongPress={(node, level) => { alert('Remove onItemLongPress method to deleteOnLongPress'); }} //Item to render renderItem={(item, level) => ( <View style={{ backgroundColor: '#f2f2f2' }}> <Text style={{ marginLeft: 25 * level, padding: 5 * level, fontSize: 16, }}> - {item.name} </Text> </View> )} /> |
For this example, we are going to use dummy data array to make a screen with 2 parents having multiple child hierarchy under them.
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 thereact-native-cli command line utility.
Open the terminal and go to the workspace and runnpm install -g react-native-clireact-native init ProjectNameInstallation of Dependency
To use TreeView we need to install react-native-final-tree-view dependency.
To install this open the terminal and jump into your project using
1 | cd ProjectName |
Run the following command to install
1 | npm install react-native-final-tree-view --save |
This command will copy all the dependency into your node_module directory.
–save is optional, it is just to update the react-native-final-tree-view dependency in your package.json file.
Now 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 | /*Example of React Native Tree View*/ import React from 'react'; //import React import { Text, View } from 'react-native'; //import Basic React Native components import TreeView from 'react-native-final-tree-view'; //import library for the TreeView class App extends React.PureComponent { //Dummy data for the Tree View state = { data: [ { id: 'Parent1', name: 'Parent1', children: [ { id: 'child1', name: 'child1', children: [ { id: 'child11', name: 'child11', children: [ { id: 'child111', name: 'child111', }, ], }, { id: 'child12', name: 'child12', }, ], }, ], }, { id: 'Parent2', name: 'Parent2', children: [ { id: 'child2', name: 'child2', children: [ { id: 'child21', name: 'child21', }, { id: 'child22', name: 'child22', }, ], }, ], }, ], }; componentDidMount() { //To get the content of TreeView console.log(this.treeView.getRawData()); } render() { return ( <View style={{ flex: 1, marginTop: 30, backgroundColor: 'white', padding: 10, }}> <TreeView //reference for the tree view ref={ref => (this.treeView = ref)} //Setting the data for the Tree View data={this.state.data} //on long press delete the item //but you have to remove onItemLongPress to work this deleteOnLongPress //on press of any element onItemPress={(node, level) => { alert('Level: ' + level + '\n' + 'Node: ' + JSON.stringify(node)); }} //on long press of a tree element onItemLongPress={(node, level) => { alert('Remove onItemLongPress method to deleteOnLongPress'); }} //Item to render renderItem={(item, level) => ( <View style={{ backgroundColor: '#f2f2f2' }}> <Text style={{ marginLeft: 25 * level, padding: 5 * level, fontSize: 16, }}> - {item.name} </Text> </View> )} /> </View> ); } } export default App; |
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).Screenshots
This is how you can make a React Native Tree View for Android and IOS using react-native-final-tree-view. 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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