Demos
Input(Angular)
ComboBox
Objects
Chaining Combos

Chaining ComboBoxes (Angular)

This sample demonstrates how to chain two ComboBoxex using filtering and binding.

The source for the first ComboBox is used to filter out options in the second ComboBox.

When you select a country from the first ComboBox below, the second will be filtered to show only cities in that country.

Learn about Input Controls | ComboBox API Reference

This example uses Angular.

JavaScript
Angular
Vue
React
app.component.ts
index.html
app.component.html
app.data.ts
styles.css
Copy to CodeMine
import 'bootstrap.css';
import '@mescius/wijmo.styles/wijmo.css';
import './styles.css';
//
import * as wijmo from '@mescius/wijmo';
//
import '@angular/compiler';
import { Component, enableProdMode, Inject, ɵresolveComponentResources } from '@angular/core';

import { BrowserModule, bootstrapApplication } from '@angular/platform-browser';
import { WjInputModule } from '@mescius/wijmo.angular2.input';
import { DataService, TCity, TCountry } from './app.data';
//
@Component({
  standalone: true,
  providers: [DataService],
  imports: [WjInputModule, BrowserModule],
  selector: 'app-component',
  templateUrl: 'src/app.component.html',
})
export class AppComponent {
  countries: wijmo.CollectionView;
  cities: wijmo.CollectionView;
  //
  constructor(@Inject(DataService) private dataService: DataService) {
    this.countries = new wijmo.CollectionView(dataService.getCountries(), {
      currentChanged: (sender: wijmo.CollectionView) => {
        this.cities.refresh(); // apply filter to cities collection
      },
    });
    this.cities = new wijmo.CollectionView(dataService.getCities(), {
      filter: (city: any) => {
        return city.country == this.countries.currentItem.id;
      },
    });
  }
}
//

//
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));
});
import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import './styles.css'; // import * as wijmo from '@mescius/wijmo'; // import '@angular/compiler'; import { Component, enableProdMode, Inject, ɵresolveComponentResources } from '@angular/core'; import { BrowserModule, bootstrapApplication } from '@angular/platform-browser'; import { WjInputModule } from '@mescius/wijmo.angular2.input'; import { DataService, TCity, TCountry } from './app.data'; // @Component({ standalone: true, providers: [DataService], imports: [WjInputModule, BrowserModule], selector: 'app-component', templateUrl: 'src/app.component.html', }) export class AppComponent { countries: wijmo.CollectionView; cities: wijmo.CollectionView; // constructor(@Inject(DataService) private dataService: DataService) { this.countries = new wijmo.CollectionView(dataService.getCountries(), { currentChanged: (sender: wijmo.CollectionView) => { this.cities.refresh(); // apply filter to cities collection }, }); this.cities = new wijmo.CollectionView(dataService.getCities(), { filter: (city: any) => { return city.country == this.countries.currentItem.id; }, }); } } // // 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 Chaining Combos</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- Polyfills --> <script src="node_modules/core-js/client/shim.min.js"></script> <script src="node_modules/zone.js/fesm2015/zone.min.js"></script> <!-- 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> // 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>
<div class="container-fluid"> <wj-combo-box [displayMemberPath]="'name'" [itemsSource]="countries"> </wj-combo-box> <wj-combo-box [displayMemberPath]="'name'" [itemsSource]="cities"> </wj-combo-box> </div>
import { Injectable } from '@angular/core'; // export type TCountry = { id: number; name: string; } // export type TCity = { id: number; country: number; name: string; } // // @Injectable() export class DataService { getCountries() { return <TCountry[]>[ { id: 0, name: 'US' }, { id: 1, name: 'Germany' }, { id: 2, name: 'UK' }, { id: 3, name: 'Japan' }, { id: 4, name: 'Italy' }, { id: 5, name: 'Greece' } ]; } // getCities() { return <TCity[]>[ { 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: 'Manchester' }, { 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' } ]; } }
body { margin-bottom: 24px; }
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'npm:@angular/forms/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);