Dynamic DataMaps (Angular)

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.

Learn about FlexGrid | FlexGrid API Reference

This example uses Angular.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import './styles.css'; // import '@angular/compiler'; import { Component, enableProdMode, ViewChild, ɵresolveComponentResources } from '@angular/core'; import { BrowserModule, bootstrapApplication } from '@angular/platform-browser'; import { WjGridModule } from '@mescius/wijmo.angular2.grid'; import { WjInputModule } from '@mescius/wijmo.angular2.input'; import { DataMap } from '@mescius/wijmo.grid'; // @Component({ standalone: true, imports: [WjGridModule, WjInputModule, BrowserModule], selector: 'app-component', templateUrl: 'src/app.component.html', }) export class AppComponent { data = this.getData(); countryMap = new DataMap(this.getCountries(), 'id', 'name'); cityMap = new DataMap(this.getCities(), 'id', 'name'); constructor() { // override cityMap's getDisplayValues method to get cities that // correspond to the current item's country (this.cityMap as any).getDisplayValues = (dataItem: any) => { let validCities = this.getCities().filter((city) => city.country == dataItem.country); return validCities.map((city) => city.name); }; } // create some data private getData() { var cities = this.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; } private 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' }, ]; } private 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' }, ]; } } // // enableProdMode(); // Resolve resources (templateUrl, styleUrls etc), After resolution all URLs have been converted into `template` strings. ɵresolveComponentResources(fetch).then(() => { // Bootstrap application bootstrapApplication(AppComponent).catch((err) => console.error(err)); });
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo FlexGrid Column Dynamic DataMaps</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- Polyfills --> <script src="https://cdn.jsdelivr.net/npm/core-js/client/shim.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/zone.js/fesm2015/zone.min.js"></script> <!-- SystemJS --> <script src="https://cdn.jsdelivr.net/npm/systemjs@0.21.5/dist/system.src.js" integrity="sha512-skZbMyvYdNoZfLmiGn5ii6KmklM82rYX2uWctBhzaXPxJgiv4XBwJnFGr5k8s+6tE1pcR1nuTKghozJHyzMcoA==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> // workaround to load 'rxjs/operators' from the rxjs bundle System.import('rxjs').then(function (m) { System.set(SystemJS.resolveSync('rxjs/operators'), System.newModule(m.operators)); System.import('./src/app.component'); }); </script> </head> <body> <app-component></app-component> </body> </html>
<main class="container-fluid"> <wj-flex-grid [itemsSource]="data"> <wj-flex-grid-column [header]="'Country'" [binding]="'country'" [dataMap]="countryMap"></wj-flex-grid-column> <wj-flex-grid-column [header]="'City'" [binding]="'city'" [dataMap]="cityMap"></wj-flex-grid-column> <wj-flex-grid-column [header]="'Downloads'" [binding]="'downloads'" format="n0"></wj-flex-grid-column> <wj-flex-grid-column [header]="'Sales'" [binding]="'sales'" format="n0"></wj-flex-grid-column> </wj-flex-grid> </main>
.wj-flexgrid { max-height: 200px; margin: 12px 0; }
(function (global) { SystemJS.config({ transpiler: './plugin-typescript.js', typescriptOptions: { target: 'ES2022', module: 'system', emitDecoratorMetadata: true, experimentalDecorators: true, }, meta: { typescript: { exports: 'ts', }, '*.css': { loader: 'systemjs-plugin-css' }, '*.mjs': { format: 'esm', }, }, paths: { // paths serve as alias 'npm:': 'node_modules/', 'cdn:': 'https://cdn.mescius.io/demoapps/packages/wijmojs/5.20261.50-rc/', 'pcdn:': 'https://cdn.jsdelivr.net/npm/', 'agpcdn:': 'https://cdn.jsdelivr.net/npm/' }, packageConfigPaths: ['/node_modules/*/package.json', '/node_modules/@angular/*/package.json', '/node_modules/@mescius/*/package.json'], map: { 'core-js': 'agpcdn:core-js@2.6.12/client/shim.min.js', 'typescript': 'agpcdn:typescript@5.9.3/lib/typescript.min.js', rxjs: 'agpcdn:rxjs@7.8.1/dist/bundles/rxjs.umd.min.js', 'systemjs-plugin-css': 'agpcdn:systemjs-plugin-css@0.1.37/css.js', '@mescius/wijmo': 'cdn:@mescius/wijmo/index.js', '@mescius/wijmo.input': 'cdn:@mescius/wijmo.input/index.js', '@mescius/wijmo.styles': 'cdn:@mescius/wijmo.styles', '@mescius/wijmo.cultures': 'cdn:@mescius/wijmo.cultures', '@mescius/wijmo.chart': 'cdn:@mescius/wijmo.chart/index.js', '@mescius/wijmo.chart.analytics': 'cdn:@mescius/wijmo.chart.analytics/index.js', '@mescius/wijmo.chart.animation': 'cdn:@mescius/wijmo.chart.animation/index.js', '@mescius/wijmo.chart.annotation': 'cdn:@mescius/wijmo.chart.annotation/index.js', '@mescius/wijmo.chart.finance': 'cdn:@mescius/wijmo.chart.finance/index.js', '@mescius/wijmo.chart.finance.analytics': 'cdn:@mescius/wijmo.chart.finance.analytics/index.js', '@mescius/wijmo.chart.hierarchical': 'cdn:@mescius/wijmo.chart.hierarchical/index.js', '@mescius/wijmo.chart.interaction': 'cdn:@mescius/wijmo.chart.interaction/index.js', '@mescius/wijmo.chart.radar': 'cdn:@mescius/wijmo.chart.radar/index.js', '@mescius/wijmo.chart.render': 'cdn:@mescius/wijmo.chart.render/index.js', '@mescius/wijmo.chart.webgl': 'cdn:@mescius/wijmo.chart.webgl/index.js', '@mescius/wijmo.chart.map': 'cdn:@mescius/wijmo.chart.map/index.js', '@mescius/wijmo.gauge': 'cdn:@mescius/wijmo.gauge/index.js', '@mescius/wijmo.grid': 'cdn:@mescius/wijmo.grid/index.js', '@mescius/wijmo.grid.detail': 'cdn:@mescius/wijmo.grid.detail/index.js', '@mescius/wijmo.grid.filter': 'cdn:@mescius/wijmo.grid.filter/index.js', '@mescius/wijmo.grid.search': 'cdn:@mescius/wijmo.grid.search/index.js', '@mescius/wijmo.grid.style': 'cdn:@mescius/wijmo.grid.style/index.js', '@mescius/wijmo.grid.grouppanel': 'cdn:@mescius/wijmo.grid.grouppanel/index.js', '@mescius/wijmo.grid.multirow': 'cdn:@mescius/wijmo.grid.multirow/index.js', '@mescius/wijmo.grid.transposed': 'cdn:@mescius/wijmo.grid.transposed/index.js', '@mescius/wijmo.grid.transposedmultirow': 'cdn:@mescius/wijmo.grid.transposedmultirow/index.js', '@mescius/wijmo.grid.pdf': 'cdn:@mescius/wijmo.grid.pdf/index.js', '@mescius/wijmo.grid.sheet': 'cdn:@mescius/wijmo.grid.sheet/index.js', '@mescius/wijmo.grid.xlsx': 'cdn:@mescius/wijmo.grid.xlsx/index.js', '@mescius/wijmo.grid.selector': 'cdn:@mescius/wijmo.grid.selector/index.js', '@mescius/wijmo.grid.cellmaker': 'cdn:@mescius/wijmo.grid.cellmaker/index.js', '@mescius/wijmo.nav': 'cdn:@mescius/wijmo.nav/index.js', '@mescius/wijmo.odata': 'cdn:@mescius/wijmo.odata/index.js', '@mescius/wijmo.olap': 'cdn:@mescius/wijmo.olap/index.js', '@mescius/wijmo.rest': 'cdn:@mescius/wijmo.rest/index.js', '@mescius/wijmo.pdf': 'cdn:@mescius/wijmo.pdf/index.js', '@mescius/wijmo.pdf.security': 'cdn:@mescius/wijmo.pdf.security/index.js', '@mescius/wijmo.viewer': 'cdn:@mescius/wijmo.viewer/index.js', '@mescius/wijmo.xlsx': 'cdn:@mescius/wijmo.xlsx/index.js', '@mescius/wijmo.undo': 'cdn:@mescius/wijmo.undo/index.js', '@mescius/wijmo.interop.grid': 'cdn:@mescius/wijmo.interop.grid/index.js', '@mescius/wijmo.touch': 'cdn:@mescius/wijmo.touch/index.js', '@mescius/wijmo.cloud': 'cdn:@mescius/wijmo.cloud/index.js', '@mescius/wijmo.barcode': 'cdn:@mescius/wijmo.barcode/index.js', '@mescius/wijmo.barcode.common': 'cdn:@mescius/wijmo.barcode.common/index.js', '@mescius/wijmo.barcode.composite': 'cdn:@mescius/wijmo.barcode.composite/index.js', '@mescius/wijmo.barcode.specialized': 'cdn:@mescius/wijmo.barcode.specialized/index.js', '@mescius/wijmo.angular2.chart.analytics': 'cdn:@mescius/wijmo.angular2.chart.analytics/index.js', '@mescius/wijmo.angular2.chart.animation': 'cdn:@mescius/wijmo.angular2.chart.animation/index.js', '@mescius/wijmo.angular2.chart.annotation': 'cdn:@mescius/wijmo.angular2.chart.annotation/index.js', '@mescius/wijmo.angular2.chart.finance.analytics': 'cdn:@mescius/wijmo.angular2.chart.finance.analytics/index.js', '@mescius/wijmo.angular2.chart.finance': 'cdn:@mescius/wijmo.angular2.chart.finance/index.js', '@mescius/wijmo.angular2.chart.hierarchical': 'cdn:@mescius/wijmo.angular2.chart.hierarchical/index.js', '@mescius/wijmo.angular2.chart.interaction': 'cdn:@mescius/wijmo.angular2.chart.interaction/index.js', '@mescius/wijmo.angular2.chart.radar': 'cdn:@mescius/wijmo.angular2.chart.radar/index.js', '@mescius/wijmo.angular2.chart.map': 'cdn:@mescius/wijmo.angular2.chart.map/index.js', '@mescius/wijmo.angular2.chart': 'cdn:@mescius/wijmo.angular2.chart/index.js', '@mescius/wijmo.angular2.core': 'cdn:@mescius/wijmo.angular2.core/index.js', '@mescius/wijmo.angular2.gauge': 'cdn:@mescius/wijmo.angular2.gauge/index.js', '@mescius/wijmo.angular2.grid.detail': 'cdn:@mescius/wijmo.angular2.grid.detail/index.js', '@mescius/wijmo.angular2.grid.filter': 'cdn:@mescius/wijmo.angular2.grid.filter/index.js', '@mescius/wijmo.angular2.grid.grouppanel': 'cdn:@mescius/wijmo.angular2.grid.grouppanel/index.js', '@mescius/wijmo.angular2.grid.search': 'cdn:@mescius/wijmo.angular2.grid.search/index.js', '@mescius/wijmo.angular2.grid.multirow': 'cdn:@mescius/wijmo.angular2.grid.multirow/index.js', '@mescius/wijmo.angular2.grid.sheet': 'cdn:@mescius/wijmo.angular2.grid.sheet/index.js', '@mescius/wijmo.angular2.grid.transposed': 'cdn:@mescius/wijmo.angular2.grid.transposed/index.js', '@mescius/wijmo.angular2.grid.transposedmultirow': 'cdn:@mescius/wijmo.angular2.grid.transposedmultirow/index.js', '@mescius/wijmo.angular2.grid': 'cdn:@mescius/wijmo.angular2.grid/index.js', '@mescius/wijmo.angular2.input': 'cdn:@mescius/wijmo.angular2.input/index.js', '@mescius/wijmo.angular2.olap': 'cdn:@mescius/wijmo.angular2.olap/index.js', '@mescius/wijmo.angular2.viewer': 'cdn:@mescius/wijmo.angular2.viewer/index.js', '@mescius/wijmo.angular2.nav': 'cdn:@mescius/wijmo.angular2.nav/index.js', '@mescius/wijmo.angular2.directivebase': 'cdn:@mescius/wijmo.angular2.directivebase/index.js', '@mescius/wijmo.angular2.barcode.common': 'cdn:@mescius/wijmo.angular2.barcode.common/index.js', '@mescius/wijmo.angular2.barcode.composite': 'cdn:@mescius/wijmo.angular2.barcode.composite/index.js', '@mescius/wijmo.angular2.barcode.specialized': 'cdn:@mescius/wijmo.angular2.barcode.specialized/index.js', 'bootstrap.css': 'pcdn:bootstrap@3.3.7/dist/css/bootstrap.min.css', jszip: 'agpcdn:jszip@3.10.1/dist/jszip.min.js', '@angular/core': 'pcdn:@angular/core@21.1.0/fesm2022/core.mjs', '@angular/core/primitives/di': 'pcdn:@angular/core@21.1.0/fesm2022/primitives-di.mjs', '@angular/core/primitives/signals': 'pcdn:@angular/core@21.1.0/fesm2022/primitives-signals.mjs', '@angular/core/primitives/event-dispatch': 'pcdn:@angular/core@21.1.0/fesm2022/primitives-event-dispatch.mjs', '@angular/common': 'pcdn:@angular/common@21.1.0/fesm2022/common.mjs', '@angular/common/http': 'pcdn:@angular/common@21.1.0/fesm2022/http.mjs', '@angular/compiler': 'pcdn:@angular/compiler@21.1.0/fesm2022/compiler.mjs', '@angular/platform-browser': 'pcdn:@angular/platform-browser@21.1.0/fesm2022/platform-browser.mjs', '@angular/platform-browser-dynamic': 'pcdn:@angular/platform-browser-dynamic@21.1.0/fesm2022/platform-browser-dynamic.mjs', '@angular/router': 'pcdn:@angular/router@21.1.0/fesm2022/router.mjs', '@angular/forms': 'pcdn:@angular/forms@21.1.0/fesm2022/forms.mjs', }, // packages tells the System loader how to load when no filename and/or no extension packages: { './src': { defaultExtension: 'ts', }, node_modules: { defaultExtension: 'js', }, wijmo: { defaultExtension: 'js', }, }, }); })(this);