React List - Customize Group Headers

You can define a groupTemplate to customize group headers. Without a groupTemplate, group headers display the text of the key field in bold font.

App.js
  • import React from 'react';
  • import 'devextreme/dist/css/dx.light.css';
  •  
  • import List from 'devextreme-react/list';
  • import DataSource from 'devextreme/data/data_source';
  •  
  • const fruitsVegetables = [{
  • key: "Fruits",
  • items: [
  • { name: "Apples", count: 10 },
  • { name: "Oranges", count: 12 },
  • { name: "Lemons", count: 15 }
  • ]
  • }, {
  • key: "Vegetables",
  • items: [
  • { name: "Potatoes", count: 5 },
  • { name: "Tomatoes", count: 9 },
  • { name: "Turnips", count: 8 }
  • ]
  • }];
  •  
  • const listDataSource = new DataSource({
  • store: fruitsVegetables,
  • map: function(groupedItem) {
  • let overallCount = 0;
  • groupedItem.items.forEach(function(item) {
  • overallCount += item.count;
  • });
  • return Object.assign(groupedItem, { overallCount: overallCount });
  • }
  • });
  •  
  • const ListItem = (data) => {
  • return (
  • <p style={{ margin: '0px' }}>{ data.name } | { data.count }</p>
  • );
  • };
  •  
  • const ListGroupHeader = (data) => {
  • return (
  • <p>{ data.key } | { data.overallCount }</p>
  • );
  • };
  •  
  • export default function App() {
  • return (
  • <List
  • dataSource={listDataSource}
  • grouped={true}
  • itemRender={ListItem}
  • groupRender={ListGroupHeader}
  • />
  • );
  • }

View Demo

See Also