React TreeView - Use Plain Data
If you use plain data in the TreeView, set the dataStructure property to "plain". For an example of plain data, see the following code snippet.
- import React from 'react';
- import 'devextreme/dist/css/dx.light.css';
- import TreeView from 'devextreme-react/tree-view';
- const plainData = [
- { id: '1', text: 'Fruits' },
- { id: '1_1', text: 'Apples', parentId: '1' },
- { id: '1_2', text: 'Oranges', parentId: '1' },
- { id: '2', text: 'Vegetables' },
- { id: '2_1', text: 'Cucumbers', parentId: '2' },
- { id: '2_2', text: 'Tomatoes', parentId: '2' }
- ];
- class App extends React.Component {
- render() {
- return (
- <TreeView
- dataStructure="plain"
- dataSource={plainData} />
- );
- }
- }
- export default App;
As you can see, all items in a plain data source have the id and text fields, and items that have a parent, have the parentId field. Those are conventional field names. To use other names, change the keyExpr, displayExpr and parentIdExpr properties, respectively.
- import React from 'react';
- import 'devextreme/dist/css/dx.light.css';
- import TreeView from 'devextreme-react/tree-view';
- const plainData = [
- { key: '1', name: 'Fruits' },
- { key: '1_1', name: 'Apples', parent: '1' },
- { key: '1_2', name: 'Oranges', parent: '1' },
- { key: '2', name: 'Vegetables' },
- { key: '2_1', name: 'Cucumbers', parent: '2' },
- { key: '2_2', name: 'Tomatoes', parent: '2' }
- ];
- class App extends React.Component {
- render() {
- return (
- <TreeView
- dataStructure="plain"
- dataSource={plainData}
- keyExpr="key"
- displayExpr="name"
- parentIdExpr="parent" />
- );
- }
- }
- export default App;
Frequently, the id of an item is also its text. In this case, set both the keyExpr and displayExpr properties to a single value.
- import React from 'react';
- import 'devextreme/dist/css/dx.light.css';
- import TreeView from 'devextreme-react/tree-view';
- const plainData = [
- { name: 'Fruits' },
- { name: 'Apples', parentId: 'Fruits' },
- { name: 'Oranges', parentId: 'Fruits' },
- { name: 'Vegetables' },
- { name: 'Cucumbers', parentId: 'Vegetables' },
- { name: 'Tomatoes', parentId: 'Vegetables' }
- ];
- class App extends React.Component {
- render() {
- return (
- <TreeView
- dataStructure="plain"
- dataSource={plainData}
- keyExpr="name"
- displayExpr="name" />
- );
- }
- }
- export default App;
See Also
If you have technical questions, please create a support ticket in the DevExpress Support Center.