Aggregates (React)

FlexGrid's columns have an aggregate property that allows you to show data summaries for the whole grid or for each group. To show group aggregates, set the aggregate property on the columns that you want to aggregate, and create groups by dragging the column headers into the group panel above the grid. Notice how the group rows contain the sum of the 'Sales' and 'Expenses' columns for each group. The aggregates are updated automatically when you edit the data.

Group aggregates can adjust their display positions with the groupSummaryPosition property, which offers Top (the default), Bottom, and Auto options. In the Auto setting, the Group Summary Row appears at the bottom of the group when it is expanded, and at the top when the group is collapsed. Notice the shift in the position of group summaries when you change the Group Summary Position value via the dropdown menu.

Learn about FlexGrid | Aggregate Groups Documentation | FlexGrid API Reference

This example uses React.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import ReactDOM from 'react-dom/client'; import React, { useRef, useState } from 'react'; import useEvent from 'react-use-event-hook'; import * as wjGrid from '@mescius/wijmo.react.grid'; import * as wjGridGrouppanelModule from '@mescius/wijmo.react.grid.grouppanel'; import { ComboBox } from '@mescius/wijmo.react.input'; import { GroupSummaryPosition } from '@mescius/wijmo.grid'; import './app.css'; import { groupSummaryPositionOptions, data } from './data'; function App() { const [groupSummaryPosition, setgroupSummaryPosition] = useState(GroupSummaryPosition.Top); const [refresh, setRefresh] = useState(0); const flexRef = useRef(null); const initializedGrid = useEvent((ctl) => { flexRef.current = ctl; setRefresh(refresh + 1); }); return (<div className="container-fluid"> <wjGridGrouppanelModule.GroupPanel grid={flexRef.current} placeholder="Drag columns here to create groups"/> <wjGrid.FlexGrid initialized={initializedGrid} itemsSource={data} groupSummaryPosition={groupSummaryPosition}> <wjGrid.FlexGridColumn binding="id" header="ID" width={60} isReadOnly={true}/> <wjGrid.FlexGridColumn binding="country" header="Country"/> <wjGrid.FlexGridColumn binding="product" header="Product"/> <wjGrid.FlexGridColumn binding="sales" header="Sales" aggregate="Sum"/> <wjGrid.FlexGridColumn binding="expenses" header="Expenses" aggregate="Sum"/> </wjGrid.FlexGrid> <label> Group Summary Position{' '} <ComboBox itemsSource={groupSummaryPositionOptions} selectedIndexChanged={(sender) => { setgroupSummaryPosition(sender.selectedIndex); }}/> </label> </div>); } const container = document.getElementById('app'); if (container) { const root = ReactDOM.createRoot(container); root.render(<App />); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo Wijmo FlexGrid Aggregate Group</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.40/system.src.js" integrity="sha512-G6mEj6h18+m3MvzdviSDfPle/TfH0//cXcB33AKlNR/Rha0yQsKefDZKRTkIZos97HEGq2JMV1RT5ybMoQ3WsQ==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div id="app"></div> </body> </html>
.wj-flexgrid { max-height: 250px; margin: 10px 0; } .wj-cell.wj-frozen-row { border-bottom: none; }
function getData() { // create some random data let countries = ['US', 'Germany', 'UK', 'Japan', 'Italy', 'Greece'], products = 'Phones,Computers,Cameras,Stereos'.split(','), data = []; for (let i = 0; i < 200; i++) { data.push({ id: i, country: countries[i % countries.length], product: products[i % products.length], sales: Math.random() * 10000, expenses: Math.random() * 5000 }); } return data; } export const groupSummaryPositionOptions = ['Top', 'Bottom', 'Auto']; export const data = getData();
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