PivotEngine Sort Control (React)

The PivotEngine automatically sorts Dimension fields when it generates data summaries. It does not sort Measure fields by default. You can change the sort direction on row and column fields by setting the field's sort property in code. Measure fields are not sorted by default. You can set their sort direction by changing the sortDescriptions property of the engine's pivotView collection. This example shows how you can apply sorts to dimension and measure fields.

Learn about OLAP | PivotPanel Documentation | PivotPanel API Reference

This example uses React.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import ReactDOM from 'react-dom/client'; import React, { useRef } from 'react'; import useEvent from 'react-use-event-hook'; import '@mescius/wijmo.touch'; // support drag/drop on touch devices import * as Olap from '@mescius/wijmo.react.olap'; import * as wjInput from '@mescius/wijmo.react.input'; import * as wjcCore from '@mescius/wijmo'; import * as wjcOlap from '@mescius/wijmo.olap'; import './app.css'; import { getData } from './data'; const ng = new wjcOlap.PivotEngine({ itemsSource: getData(100), rowFields: ['Country', 'Product'], valueFields: ['Sales', 'Expenses'] }); function App() { const pivotGridRef = useRef(null); const sortSalesRef = useRef(null); const sortExpensesRef = useRef(null); const sortOptions = ['Ascending', 'Descending']; const sortOptions2 = ['None', 'Ascending', 'Descending']; const initializePivotGrid = useEvent((pivotGrid) => { pivotGridRef.current = pivotGrid; }); const initializeSortSales = useEvent((combo) => { sortSalesRef.current = combo; }); const initializeSortExpenses = useEvent((combo) => { sortExpensesRef.current = combo; }); const onCountrySelectedIndexChanged = useEvent((combo) => { ng.fields.getField('Country').descending = combo.selectedIndex == 1; }); const onProductSelectedIndexChanged = useEvent((combo) => { ng.fields.getField('Product').descending = combo.selectedIndex == 1; }); const onSubtotalsClick = (e) => { ng.showRowTotals = e.target.checked ? wjcOlap.ShowTotals.Subtotals : wjcOlap.ShowTotals.GrandTotals; }; const updateMeasureSort = () => { let sd = ng.pivotView.sortDescriptions; sd.clear(); addMeasureSort('Sales', sortSalesRef.current.text); addMeasureSort('Expenses', sortExpensesRef.current.text); }; const addMeasureSort = (fieldName, sortDirection) => { if (sortDirection != 'None') { let sd = ng.pivotView.sortDescriptions, cols = pivotGridRef.current.columns; for (let c = 0; c < cols.length; c++) { let binding = cols[c].binding; if (binding.indexOf(fieldName) == 0) { sd.push(new wjcCore.SortDescription(binding, sortDirection == 'Ascending')); } } } }; return (<div className="container-fluid"> <div className="row"> <div className="col-sm-4 panel"> <h4 className="sample-h4"> Sort Dimension fields </h4> <label> Country: <wjInput.ComboBox itemsSource={sortOptions} selectedIndexChanged={onCountrySelectedIndexChanged}/> </label> <label> Product: <wjInput.ComboBox itemsSource={sortOptions} selectedIndexChanged={onProductSelectedIndexChanged}/> </label> <h4 className="sample-h4"> Sort Measure fields </h4> <label> Sales: <wjInput.ComboBox itemsSource={sortOptions2} initialized={initializeSortSales} selectedIndexChanged={updateMeasureSort}/> </label> <label> Expenses: <wjInput.ComboBox itemsSource={sortOptions2} initialized={initializeSortExpenses} selectedIndexChanged={updateMeasureSort}/> </label> <label> Subtotals: <input id="subtotals" type="checkbox" onClick={onSubtotalsClick}/> </label> </div> <div className="col-sm-8"> <Olap.PivotGrid itemsSource={ng} initialized={initializePivotGrid}/> </div> </div> </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 OLAP Fields Sort</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-pivotgrid { box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19), 0 6px 6px rgba(0, 0, 0, 0.23); } .panel label { display: block; } .panel label .wj-combobox { font-weight: normal; } h4.sample-h4 { margin-top: 20pt; }
export function getData(cnt) { var countries = 'US,Germany,UK,Japan,Italy'.split(','), products = 'Widgets,Gadgets,Doohickeys'.split(','), data = []; for (var i = 0; i < cnt; i++) { data.push({ country: countries[i % countries.length], product: products[i % products.length], downloads: Math.round(Math.random() * 20000), sales: Math.random() * 10000, expenses: Math.random() * 5000 }); } return data; }
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