Calculated Field Aggregates

PivotField objects have two properties that support custom calculations:

The getValue property is a function that takes a data item as a parameter and returns a value that is calculated based on other properties of the data item. The function has no access to any aggregate information.

This sample uses the getValue function to implement a Range field that categorizes raw sales value into three levels: "High", "Medium", or "Low".

The getAggregateValue property is a function that takes a summary row as a parameter and returns a value to be displayed as an aggregate for the field. The function has no access to the individual/raw data items.

This sample uses the getAggregateValue function to implement a Conversion field that shows the Sales/Downloads ratio for each summary row.

Learn about OLAP | PivotPanel Documentation | PivotPanel API Reference

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import './styles.css'; import '@mescius/wijmo.touch'; // support drag/drop on touch devices import { PivotEngine, PivotPanel, PivotGrid } from '@mescius/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: 'Conversion', dataType: 'Number', format: 'p0', // getAggregateValue computes an aggregate from a summary row (Sales/Downloads) getAggregateValue: row => row.Downloads ? row.Sales / row.Downloads : 0 } ], rowFields: ['Date', 'Range'], valueFields: ['Sales', 'Downloads', 'Conversion'] }); // // 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 Field Calculated Aggregates</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.21.5/system.src.js" integrity="sha512-skZbMyvYdNoZfLmiGn5ii6KmklM82rYX2uWctBhzaXPxJgiv4XBwJnFGr5k8s+6tE1pcR1nuTKghozJHyzMcoA==" crossorigin="anonymous"></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; }
(function (global) { System.config({ transpiler: 'plugin-babel', babelOptions: { es2015: true }, meta: { '*.css': { loader: 'css' } }, paths: { // paths serve as alias 'npm:': 'node_modules/' }, // map tells the System loader where to look for things map: { 'jszip': 'npm:jszip/dist/jszip.js', '@mescius/wijmo': 'npm:@mescius/wijmo/index.js', '@mescius/wijmo.input': 'npm:@mescius/wijmo.input/index.js', '@mescius/wijmo.styles': 'npm:@mescius/wijmo.styles', '@mescius/wijmo.cultures': 'npm:@mescius/wijmo.cultures', '@mescius/wijmo.chart': 'npm:@mescius/wijmo.chart/index.js', '@mescius/wijmo.chart.analytics': 'npm:@mescius/wijmo.chart.analytics/index.js', '@mescius/wijmo.chart.animation': 'npm:@mescius/wijmo.chart.animation/index.js', '@mescius/wijmo.chart.annotation': 'npm:@mescius/wijmo.chart.annotation/index.js', '@mescius/wijmo.chart.finance': 'npm:@mescius/wijmo.chart.finance/index.js', '@mescius/wijmo.chart.finance.analytics': 'npm:@mescius/wijmo.chart.finance.analytics/index.js', '@mescius/wijmo.chart.hierarchical': 'npm:@mescius/wijmo.chart.hierarchical/index.js', '@mescius/wijmo.chart.interaction': 'npm:@mescius/wijmo.chart.interaction/index.js', '@mescius/wijmo.chart.radar': 'npm:@mescius/wijmo.chart.radar/index.js', '@mescius/wijmo.chart.render': 'npm:@mescius/wijmo.chart.render/index.js', '@mescius/wijmo.chart.webgl': 'npm:@mescius/wijmo.chart.webgl/index.js', '@mescius/wijmo.chart.map': 'npm:@mescius/wijmo.chart.map/index.js', '@mescius/wijmo.gauge': 'npm:@mescius/wijmo.gauge/index.js', '@mescius/wijmo.grid': 'npm:@mescius/wijmo.grid/index.js', '@mescius/wijmo.grid.detail': 'npm:@mescius/wijmo.grid.detail/index.js', '@mescius/wijmo.grid.filter': 'npm:@mescius/wijmo.grid.filter/index.js', '@mescius/wijmo.grid.search': 'npm:@mescius/wijmo.grid.search/index.js', '@mescius/wijmo.grid.grouppanel': 'npm:@mescius/wijmo.grid.grouppanel/index.js', '@mescius/wijmo.grid.multirow': 'npm:@mescius/wijmo.grid.multirow/index.js', '@mescius/wijmo.grid.transposed': 'npm:@mescius/wijmo.grid.transposed/index.js', '@mescius/wijmo.grid.transposedmultirow': 'npm:@mescius/wijmo.grid.transposedmultirow/index.js', '@mescius/wijmo.grid.pdf': 'npm:@mescius/wijmo.grid.pdf/index.js', '@mescius/wijmo.grid.sheet': 'npm:@mescius/wijmo.grid.sheet/index.js', '@mescius/wijmo.grid.xlsx': 'npm:@mescius/wijmo.grid.xlsx/index.js', '@mescius/wijmo.grid.selector': 'npm:@mescius/wijmo.grid.selector/index.js', '@mescius/wijmo.grid.cellmaker': 'npm:@mescius/wijmo.grid.cellmaker/index.js', '@mescius/wijmo.nav': 'npm:@mescius/wijmo.nav/index.js', '@mescius/wijmo.odata': 'npm:@mescius/wijmo.odata/index.js', '@mescius/wijmo.olap': 'npm:@mescius/wijmo.olap/index.js', '@mescius/wijmo.rest': 'npm:@mescius/wijmo.rest/index.js', '@mescius/wijmo.pdf': 'npm:@mescius/wijmo.pdf/index.js', '@mescius/wijmo.pdf.security': 'npm:@mescius/wijmo.pdf.security/index.js', '@mescius/wijmo.viewer': 'npm:@mescius/wijmo.viewer/index.js', '@mescius/wijmo.xlsx': 'npm:@mescius/wijmo.xlsx/index.js', '@mescius/wijmo.undo': 'npm:@mescius/wijmo.undo/index.js', '@mescius/wijmo.interop.grid': 'npm:@mescius/wijmo.interop.grid/index.js', '@mescius/wijmo.touch': 'npm:@mescius/wijmo.touch/index.js', '@mescius/wijmo.cloud': 'npm:@mescius/wijmo.cloud/index.js', '@mescius/wijmo.barcode': 'npm:@mescius/wijmo.barcode/index.js', '@mescius/wijmo.barcode.common': 'npm:@mescius/wijmo.barcode.common/index.js', '@mescius/wijmo.barcode.composite': 'npm:@mescius/wijmo.barcode.composite/index.js', '@mescius/wijmo.barcode.specialized': 'npm:@mescius/wijmo.barcode.specialized/index.js', 'jszip': 'npm:jszip/dist/jszip.js', 'bootstrap.css': 'npm:bootstrap/dist/css/bootstrap.min.css', 'css': 'npm:systemjs-plugin-css/css.js', 'plugin-babel': 'npm:systemjs-plugin-babel/plugin-babel.js', 'systemjs-babel-build':'npm:systemjs-plugin-babel/systemjs-babel-browser.js' }, // packages tells the System loader how to load when no filename and/or no extension packages: { src: { defaultExtension: 'js' }, "node_modules": { defaultExtension: 'js' }, } }); })(this);