级联下拉框

ComboBox控件根据 itemsSource 自动创建CollectionView对象,并通过 collectionView 属性公开此视图。

您可以使用此功能将过滤器应用于组合项。 例如,当您从下面的第一个组合中选择一个国家/地区时,第二个组合将被过滤以仅显示该国家/地区的城市:

import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; // import * as input from '@grapecity/wijmo.input'; import { getCountries, getCities } from './data'; // document.readyState === 'complete' ? init() : window.onload = init; // function init() { // create country and city combos let cmbCountry = new input.ComboBox('#cmbCountry', { displayMemberPath: 'name', itemsSource: getCountries() }); let cmbCity = new input.ComboBox('#cmbCity', { displayMemberPath: 'name', itemsSource: getCities() }); // filter city view based on currently selected country cmbCity.collectionView.filter = (city) => { return city.country === cmbCountry.collectionView.currentItem.id; }; cmbCountry.collectionView.currentChanged.addHandler(() => { cmbCity.collectionView.refresh(); // apply the filter }); } <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity Chaining Combos</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="cmbCountry"></div> <div id="cmbCity"></div> </div> </body> </html> // export 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' } ]; } // export 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: '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; } import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; // import * as wijmo from '@grapecity/wijmo'; // import { Component, enableProdMode, NgModule, Inject } from '@angular/core'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { BrowserModule } from '@angular/platform-browser'; import { WjInputModule } from '@grapecity/wijmo.angular2.input'; import { DataService, TCity, TCountry } from './app.data'; // @Component({ 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; } }); } } // @NgModule({ imports: [WjInputModule, BrowserModule], declarations: [AppComponent], providers: [DataService], bootstrap: [AppComponent] }) export class AppModule { } // enableProdMode(); // Bootstrap application with hash style navigation and global services. platformBrowserDynamic().bootstrapModule(AppModule); <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity 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/dist/zone.min.js"></script> <!-- SystemJS --> <script src="node_modules/systemjs/dist/system.js"></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; } <template> <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> </template> <script> import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import Vue from 'vue'; import '@grapecity/wijmo.vue2.core'; import '@grapecity/wijmo.vue2.input'; import { getCities, getCountries } from './data'; let App = Vue.extend({ name: 'app', data: function () { // create chained collection views let cities = new wijmo.CollectionView(getCities()); let countries =new wijmo.CollectionView(getCountries(), { currentChanged: () => { cities.refresh() // refresh filter } }); cities.filter = city => { // define filter return city.country === (countries.currentItem).id; }; // expose collection views return { cities: cities, countries: countries } } }) let vm = new Vue({ render: h => h(App) }).$mount('#app'); </script> <style> body { margin-bottom: 24px; } </style> <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity Chaining Combos</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.vue'); </script> </head> <body> <div id="app"></div> </body> </html> // export 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' } ]; } // export 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: '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' } ]; } import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './app.css'; import * as React from 'react'; import * as ReactDOM from 'react-dom'; import { CollectionView } from '@grapecity/wijmo'; import { ComboBox } from '@grapecity/wijmo.react.input'; import { getCountries, getCities } from './data'; class App extends React.Component { constructor(props) { super(props); this.state = { countries: new CollectionView(getCountries(), { currentChanged: (sender) => { this.state.cities.refresh(); // apply the filte } }), cities: new CollectionView(getCities()) }; this.state.cities.filter = city => { return this.state.countries.currentItem.id == city.country; }; } ; render() { return <div className="container-fluid"> <ComboBox displayMemberPath="name" itemsSource={this.state.countries}/> <ComboBox displayMemberPath="name" itemsSource={this.state.cities}/> </div>; } } ReactDOM.render(<App />, document.getElementById('app')); <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity Chaining Combos</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 id="app"></div> </body> </html> body { margin-bottom: 24px; } export 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' } ]; } // export 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: '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' } ]; }