Angular TreeView - Customize Node Appearance
For minor customization of nodes, you can define specific fields in node data objects. For example, the following code adds an icon to each node.
App.js
- import React from 'react';
- import 'devextreme/dist/css/dx.light.css';
- import TreeView from 'devextreme-react/tree-view';
- const hierarchicalData = [{
- id: '1',
- text: 'Fruits',
- icon: '/pics/fruits.ico',
- items: [
- { id: '1_1', text: 'Apples', icon: '/pics/fruits/apple.ico' },
- { id: '1_2', text: 'Oranges', icon: '/pics/fruits/orange.ico' }
- ]
- }, {
- id: '2',
- text: 'Vegetables',
- icon: '/pics/vegetables.ico',
- items: [
- { id: '2_1', text: 'Cucumbers', icon: '/pics/vegetables/cucumber.ico' },
- { id: '2_2', text: 'Tomatoes', icon: '/pics/vegetables/tomato.ico' }
- ]
- }];
- class App extends React.Component {
- render() {
- return (
- <TreeView
- items={hierarchicalData} />
- );
- }
- }
- export default App;
If you need a more flexible solution, define an itemTemplate.
App.js
- import React from 'react';
- import 'devextreme/dist/css/dx.light.css';
- import TreeView from 'devextreme-react/tree-view';
- const hierarchicalData = [{
- id: '1',
- text: 'Fruits',
- items: [
- { id: '1_1', text: 'Apples' },
- { id: '1_2', text: 'Oranges' }
- ]
- }, {
- id: '2',
- text: 'Vegetables',
- items: [
- { id: '2_1', text: 'Cucumbers' },
- { id: '2_2', text: 'Tomatoes' }
- ]
- }];
- class App extends React.Component {
- render() {
- return (
- <TreeView
- itemRender={this.renderTreeViewItem}
- items={hierarchicalData} />
- );
- }
- renderTreeViewItem(item) {
- return (
- <i>{item.text}</i>
- );
- }
- }
- export default App;
You can also customize individual nodes. Declare them using the dxItem component.
App.js
- import React from 'react';
- import 'devextreme/dist/css/dx.light.css';
- import TreeView, { Item } from 'devextreme-react/tree-view';
- class App extends React.Component {
- render() {
- return (
- <TreeView>
- <Item>
- <i>Apples</i>
- </Item>
- <Item>
- <p>Oranges</p>
- </Item>
- </TreeView>
- );
- }
- }
- export default App;
See Also
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