Dynamic DataMaps

If the list of valid values for a cell depends on the data item the cell is bound to, you can create a DataMap and override its getDisplayValues method to return a subset of the full value list.

For example, the grid below shows a list of data items with countries and cities. The drop-down city list includes only cities in the data item's country.

import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; import '@grapecity/wijmo.input'; import { FlexGrid, DataMap } from '@grapecity/wijmo.grid'; document.readyState === 'complete' ? init() : window.onload = init; function init() { // create data maps var countryMap = new DataMap(getCountries(), 'id', 'name'); var cityMap = new DataMap(getCities(), 'id', 'name'); // override cityMap's getDisplayValues method to get cities that // correspond to the current item's country cityMap.getDisplayValues = function (dataItem) { let validCities = getCities().filter(city => city.country == dataItem.country); return validCities.map(city => city.name); }; // create and bind the grid var theGrid = new FlexGrid('#theGrid', { autoGenerateColumns: false, columns: [ { binding: 'country', header: 'Country', dataMap: countryMap }, { binding: 'city', header: 'City', dataMap: cityMap }, { binding: 'downloads', header: 'Downloads', format: 'n0' }, { binding: 'sales', header: 'Sales', format: 'n0' } ], itemsSource: getData() }); // create some random data function getData() { var cities = getCities(), data = []; for (var i = 0; i < cities.length; i++) { data.push({ country: cities[i].country, city: cities[i].id, downloads: Math.round(Math.random() * 20000), sales: Math.random() * 10000, expenses: Math.random() * 5000 }); } return data; } function getCountries() { return [ { id: 0, name: 'US' }, { id: 1, name: 'Germany' }, { id: 2, name: 'UK' }, { id: 3, name: 'Japan' }, { id: 4, name: 'Italy' }, { id: 5, name: 'Greece' } ]; } function getCities() { return [ { id: 0, country: 0, name: 'Washington' }, { id: 1, country: 0, name: 'Miami' }, { id: 2, country: 0, name: 'Seattle' }, { id: 3, country: 1, name: 'Bonn' }, { id: 4, country: 1, name: 'Munich' }, { id: 5, country: 1, name: 'Berlin' }, { id: 6, country: 2, name: 'London' }, { id: 7, country: 2, name: 'Oxford' }, { id: 8, country: 2, name: 'Bath' }, { id: 9, country: 3, name: 'Tokyo' }, { id: 10, country: 3, name: 'Sendai' }, { id: 11, country: 3, name: 'Kobe' }, { id: 12, country: 4, name: 'Rome' }, { id: 13, country: 4, name: 'Florence' }, { id: 14, country: 4, name: 'Milan' }, { id: 15, country: 5, name: 'Athens' }, { id: 16, country: 5, name: 'Santorini' }, { id: 17, country: 5, name: 'Thebes' } ]; } }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity Wijmo FlexGrid Column Dynamic DataMaps</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 id="theGrid"></div> </div> </body> </html>
.wj-flexgrid { max-height: 200px; margin: 12px 0; }
(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', '@grapecity/wijmo': 'npm:@grapecity/wijmo/index.js', '@grapecity/wijmo.input': 'npm:@grapecity/wijmo.input/index.js', '@grapecity/wijmo.styles': 'npm:@grapecity/wijmo.styles', '@grapecity/wijmo.cultures': 'npm:@grapecity/wijmo.cultures', '@grapecity/wijmo.chart': 'npm:@grapecity/wijmo.chart/index.js', '@grapecity/wijmo.chart.analytics': 'npm:@grapecity/wijmo.chart.analytics/index.js', '@grapecity/wijmo.chart.animation': 'npm:@grapecity/wijmo.chart.animation/index.js', '@grapecity/wijmo.chart.annotation': 'npm:@grapecity/wijmo.chart.annotation/index.js', '@grapecity/wijmo.chart.finance': 'npm:@grapecity/wijmo.chart.finance/index.js', '@grapecity/wijmo.chart.finance.analytics': 'npm:@grapecity/wijmo.chart.finance.analytics/index.js', '@grapecity/wijmo.chart.hierarchical': 'npm:@grapecity/wijmo.chart.hierarchical/index.js', '@grapecity/wijmo.chart.interaction': 'npm:@grapecity/wijmo.chart.interaction/index.js', '@grapecity/wijmo.chart.radar': 'npm:@grapecity/wijmo.chart.radar/index.js', '@grapecity/wijmo.chart.render': 'npm:@grapecity/wijmo.chart.render/index.js', '@grapecity/wijmo.gauge': 'npm:@grapecity/wijmo.gauge/index.js', '@grapecity/wijmo.grid': 'npm:@grapecity/wijmo.grid/index.js', '@grapecity/wijmo.grid.detail': 'npm:@grapecity/wijmo.grid.detail/index.js', '@grapecity/wijmo.grid.filter': 'npm:@grapecity/wijmo.grid.filter/index.js', '@grapecity/wijmo.grid.search': 'npm:@grapecity/wijmo.grid.search/index.js', '@grapecity/wijmo.grid.grouppanel': 'npm:@grapecity/wijmo.grid.grouppanel/index.js', '@grapecity/wijmo.grid.multirow': 'npm:@grapecity/wijmo.grid.multirow/index.js', '@grapecity/wijmo.grid.transposed': 'npm:@grapecity/wijmo.grid.transposed/index.js', '@grapecity/wijmo.grid.pdf': 'npm:@grapecity/wijmo.grid.pdf/index.js', '@grapecity/wijmo.grid.sheet': 'npm:@grapecity/wijmo.grid.sheet/index.js', '@grapecity/wijmo.grid.xlsx': 'npm:@grapecity/wijmo.grid.xlsx/index.js', '@grapecity/wijmo.grid.selector': 'npm:@grapecity/wijmo.grid.selector/index.js', '@grapecity/wijmo.grid.cellmaker': 'npm:@grapecity/wijmo.grid.cellmaker/index.js', '@grapecity/wijmo.nav': 'npm:@grapecity/wijmo.nav/index.js', '@grapecity/wijmo.odata': 'npm:@grapecity/wijmo.odata/index.js', '@grapecity/wijmo.olap': 'npm:@grapecity/wijmo.olap/index.js', '@grapecity/wijmo.pdf': 'npm:@grapecity/wijmo.pdf/index.js', '@grapecity/wijmo.viewer': 'npm:@grapecity/wijmo.viewer/index.js', '@grapecity/wijmo.xlsx': 'npm:@grapecity/wijmo.xlsx/index.js', '@grapecity/wijmo.undo': 'npm:@grapecity/wijmo.undo/index.js', '@grapecity/wijmo.interop.grid': 'npm:@grapecity/wijmo.interop.grid/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);