Calculated Fields

Calculated fields provide an extra level of abstraction from the raw data values. To summarize calculated values instead of raw values, you can add a custom field with the getValue property set to a function that calculates the value based on other fields in the same raw data item.

This sample adds two calculated fields to a PivotEngine instance: Range and Bonus.

The Range field categorizes raw sales value into three levels: "High", "Medium", or "Low".

The Bonus field calculates a bonus amount based on the raw sales value.

Learn about OLAP | PivotPanel Documentation | PivotPanel API Reference

import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; import '@grapecity/wijmo.touch'; // support drag/drop on touch devices import { PivotEngine, PivotPanel, PivotGrid } from '@grapecity/wijmo.olap'; import { getData } from './data'; // document.readyState === 'complete' ? init() : window.onload = init; // function init() { let ng = new PivotEngine({ autoGenerateFields: false, itemsSource: getData(10000), showColumnTotals: 'GrandTotals', showRowTotals: 'Subtotals', fields: [ { binding: 'product', header: 'Product' }, { binding: 'date', header: 'Date', format: 'yyyy \"Q\"q' }, { header: 'Range', dataType: 'String', aggregate: 'Cnt', // use getValue to calculate the sales range (High, Medium, or Low) getValue: (item) => { let sales = item.sales; return sales <= 13 ? 'Low' : sales >= 17 ? 'High' : 'Medium'; } }, { binding: 'sales', header: 'Sales', format: 'n0' }, { binding: 'downloads', header: 'Downloads', format: 'n0' }, { header: 'Bonus', dataType: 'Number', aggregate: 'Sum', format: 'c0', // use getValue to calculate the bonus: // if sales > 15 units, the bonus is 3% of units * unit price; // otherwise, it's zero. getValue: (item) => item.sales > 15 ? item.sales * 50 * 0.03 : 0 } ], rowFields: ['Date', 'Range'], valueFields: ['Sales', 'Bonus'] }); // // show panel new PivotPanel('#pivotPanel', { itemsSource: ng }); // // show summary new PivotGrid('#pivotGrid', { isReadOnly: true, itemsSource: ng }); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo OLAP Calculated Fields</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="node_modules/systemjs/dist/system.src.js"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div class="container-fluid"> <div class="row"> <div class="col-sm-6"> <div id="pivotPanel"></div> </div> <div class="col-sm-6"> <div id="pivotGrid"></div> </div> </div> </div> </body> </html>
export function getData(cnt) { let year = new Date().getFullYear(), data = []; // for (let i = 0; i < cnt; i++) { data.push({ product: randomInt(0, 1) ? 'Wijmo' : 'Aoba', country: randomInt(0, 1) ? 'USA' : 'Japan', active: i % 2 == 0, date: new Date(year - randomInt(0, 2), randomInt(0, 11), randomInt(0, 27) + 1), sales: randomInt(10, 20), downloads: randomInt(10, 200) }); } // return data; } function randomInt(min, max) { return Math.floor(Math.random() * (max - min + 1) + min); }
.wj-pivotgrid { max-height: 400px; box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19), 0 6px 6px rgba(0, 0, 0, 0.23); } .wj-pivotgrid .wj-cell.spark { padding: 8px; overflow: visible; } .wj-pivotgrid .wj-cell.spark svg { overflow: visible; stroke: currentColor; fill: currentColor; } .wj-pivotgrid .wj-cell.spark.spark-up svg { color: #009000; /* green for up */ } .wj-pivotgrid .wj-cell.spark.spark-down svg { color: #d00000; /* red for down */ } body { margin-bottom: 48pt; }
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