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Drop Down Box

Multiple Selection

If the UI component embedded into the DropDownBox allows multiple selection, synchronize the DropDownBox value with the selected items. Synchronization instructions are the same for every selection mode.

In this demo, the DataGrid's selection.mode and TreeView's selectionMode properties are used to enable multiple selection.

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<div class="dx-fieldset"> <div class="dx-field"> <div class="dx-field-label">DropDownBox with embedded TreeView</div> <div class="dx-field-value"> <dx-drop-down-box [(value)]="treeBoxValue" valueExpr="ID" displayExpr="name" placeholder="Select a value..." [showClearButton]="true" [dataSource]="treeDataSource" (onValueChanged)="onDropDownBoxValueChanged($event)" > <div *dxTemplate="let data of 'content'"> <dx-tree-view [dataSource]="treeDataSource" dataStructure="plain" keyExpr="ID" parentIdExpr="categoryId" selectionMode="multiple" showCheckBoxesMode="normal" [selectNodesRecursive]="false" displayExpr="name" [selectByClick]="true" (onContentReady)="onTreeViewReady($event)" (onItemSelectionChanged)="onTreeViewSelectionChanged($event)" > </dx-tree-view> </div> </dx-drop-down-box> </div> </div> <div class="dx-field"> <div class="dx-field-label">DropDownBox with embedded DataGrid</div> <div class="dx-field-value"> <dx-drop-down-box [(value)]="gridBoxValue" valueExpr="ID" displayExpr="CompanyName" placeholder="Select a value..." [showClearButton]="true" [dataSource]="gridDataSource" > <div *dxTemplate="let data of 'content'"> <dx-data-grid [dataSource]="gridDataSource" [columns]="['CompanyName', 'City', 'Phone']" [selection]="{ mode: 'multiple' }" [hoverStateEnabled]="true" [paging]="{ enabled: true, pageSize: 10 }" [filterRow]="{ visible: true }" [scrolling]="{ mode: 'virtual' }" [height]="345" [(selectedRowKeys)]="gridBoxValue" > </dx-data-grid> </div> </dx-drop-down-box> </div> </div> </div>
import { NgModule, Component, ViewChild, enableProdMode, } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { HttpClient, HttpClientModule } from '@angular/common/http'; import { DxDropDownBoxModule, DxTreeViewModule, DxDataGridModule, DxTreeViewComponent, } from 'devextreme-angular'; import CustomStore from 'devextreme/data/custom_store'; if (!/localhost/.test(document.location.host)) { enableProdMode(); } @Component({ selector: 'demo-app', templateUrl: 'app/app.component.html', styleUrls: ['app/app.component.css'], }) export class AppComponent { @ViewChild(DxTreeViewComponent, { static: false }) treeView; treeDataSource: any; treeBoxValue: string[]; gridDataSource: any; gridBoxValue: number[] = [3]; constructor(http: HttpClient) { this.treeDataSource = this.makeAsyncDataSource(http, 'treeProducts.json'); this.gridDataSource = this.makeAsyncDataSource(http, 'customers.json'); this.treeBoxValue = ['1_1']; } makeAsyncDataSource(http, jsonFile) { return new CustomStore({ loadMode: 'raw', key: 'ID', load() { return http.get(`../../../../data/${jsonFile}`) .toPromise(); }, }); } onDropDownBoxValueChanged(e) { this.updateSelection(this.treeView && this.treeView.instance); } onTreeViewReady(e) { this.updateSelection(e.component); } updateSelection(treeView) { if (!treeView) return; if (!this.treeBoxValue) { treeView.unselectAll(); } if (this.treeBoxValue) { this.treeBoxValue.forEach(((value) => { treeView.selectItem(value); })); } } onTreeViewSelectionChanged(e) { this.treeBoxValue = e.component.getSelectedNodeKeys(); } } @NgModule({ imports: [ BrowserModule, DxTreeViewModule, DxDropDownBoxModule, HttpClientModule, DxDataGridModule, ], declarations: [AppComponent], bootstrap: [AppComponent], }) export class AppModule { } platformBrowserDynamic().bootstrapModule(AppModule);
:host .dx-fieldset { height: 500px; }
// In real applications, you should not transpile code in the browser. // You can see how to create your own application with Angular and DevExtreme here: // https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/ window.config = { transpiler: 'ts', typescriptOptions: { module: 'system', emitDecoratorMetadata: true, experimentalDecorators: true, }, meta: { 'typescript': { 'exports': 'ts', }, 'devextreme/localization.js': { 'esModule': true, }, }, paths: { 'npm:': 'https://unpkg.com/', }, map: { 'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js', 'typescript': 'npm:typescript@3.5.3/lib/typescript.js', '@angular/core': 'npm:@angular/core@12.2.13', '@angular/platform-browser': 'npm:@angular/platform-browser@12.2.13', '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@12.2.13', '@angular/forms': 'npm:@angular/forms@12.2.13', '@angular/common/http': 'npm:@angular/common@12.2.13/bundles/common-http.umd.js', '@angular/common': 'npm:@angular/common@12.2.13', '@angular/compiler': 'npm:@angular/compiler@12.2.13', 'tslib': 'npm:tslib@2.3.1/tslib.js', 'rxjs': 'npm:rxjs@6.4.0', 'rrule': 'npm:rrule@2.6.6/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.28.0/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@21.2.3/cjs', 'devextreme/bundles/dx.all': 'npm:devextreme@21.2.3/bundles/dx.all.js', 'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.5.5/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.1.37', 'devexpress-gantt': 'npm:devexpress-gantt@3.1.24', 'devextreme-angular': 'npm:devextreme-angular@21.2.3', '@devextreme/vdom': 'npm:@devextreme/vdom@2.2.3', '@devextreme/runtime': 'npm:@devextreme/runtime@2.3.8', 'inferno': 'npm:inferno@7.4.10/dist/inferno.min.js', 'inferno-compat': 'npm:inferno-compat@7.4.10/dist/inferno-compat.min.js', 'inferno-create-element': 'npm:inferno-create-element@7.4.10/dist/inferno-create-element.min.js', 'inferno-dom': 'npm:inferno-dom@1.0.7/dist/inferno-dom.min.js', 'inferno-hydrate': 'npm:inferno-hydrate@7.4.10/dist/inferno-hydrate.min.js', 'inferno-clone-vnode': 'npm:inferno-clone-vnode@7.4.10/dist/inferno-clone-vnode.min.js', 'inferno-create-class': 'npm:inferno-create-class@7.4.10/dist/inferno-create-class.min.js', 'inferno-extras': 'npm:inferno-extras@7.4.10/dist/inferno-extras.min.js', }, packages: { 'app': { main: './app.component.ts', defaultExtension: 'ts', }, 'devextreme': { defaultExtension: 'js', }, '@devextreme/vdom': { defaultExtension: 'js', }, 'devextreme/events/utils': { main: 'index', }, 'devextreme/events': { main: 'index', }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js', }, }, packageConfigPaths: [ 'npm:@devextreme/*/package.json', 'npm:@devextreme/runtime@2.3.8/inferno/package.json', 'npm:@angular/*/package.json', 'npm:@angular/common/*/package.json', 'npm:rxjs@6.4.0/package.json', 'npm:rxjs@6.4.0/operators/package.json', 'npm:devextreme-angular/*/package.json', 'npm:devextreme-angular@21.2.3/ui/*/package.json', 'npm:devextreme-angular@21.2.3/package.json', 'npm:devexpress-diagram@2.1.37/package.json', 'npm:devexpress-gantt@3.1.24/package.json', ], }; System.config(window.config);
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.3/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.3/css/dx.light.css" /> <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script> <script src="https://unpkg.com/zone.js@0.11.4/dist/zone.js"></script> <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script src="config.js"></script> <script> System.import("app").catch(console.error.bind(console)); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <demo-app>Loading...</demo-app> </div> </body> </html>
[{ "ID": 1, "CompanyName": "Premier Buy", "Address": "7601 Penn Avenue South", "City": "Richfield", "State": "Minnesota", "Zipcode": 55423, "Phone": "(612) 291-1000", "Fax": "(612) 291-2001", "Website": "http://www.nowebsitepremierbuy.com" }, { "ID": 2, "CompanyName": "ElectrixMax", "Address": "263 Shuman Blvd", "City": "Naperville", "State": "Illinois", "Zipcode": 60563, "Phone": "(630) 438-7800", "Fax": "(630) 438-7801", "Website": "http://www.nowebsiteelectrixmax.com" }, { "ID": 3, "CompanyName": "Video Emporium", "Address": "1201 Elm Street", "City": "Dallas", "State": "Texas", "Zipcode": 75270, "Phone": "(214) 854-3000", "Fax": "(214) 854-3001", "Website": "http://www.nowebsitevideoemporium.com" }, { "ID": 4, "CompanyName": "Screen Shop", "Address": "1000 Lowes Blvd", "City": "Mooresville", "State": "North Carolina", "Zipcode": 28117, "Phone": "(800) 445-6937", "Fax": "(800) 445-6938", "Website": "http://www.nowebsitescreenshop.com" }, { "ID": 5, "CompanyName": "Braeburn", "Address": "1 Infinite Loop", "City": "Cupertino", "State": "California", "Zipcode": 95014, "Phone": "(408) 996-1010", "Fax": "(408) 996-1012", "Website": "http://www.nowebsitebraeburn.com" }, { "ID": 6, "CompanyName": "PriceCo", "Address": "30 Hunter Lane", "City": "Camp Hill", "State": "Pennsylvania", "Zipcode": 17011, "Phone": "(717) 761-2633", "Fax": "(717) 761-2334", "Website": "http://www.nowebsitepriceco.com" }, { "ID": 7, "CompanyName": "Ultimate Gadget", "Address": "1557 Watson Blvd", "City": "Warner Robbins", "State": "Georgia", "Zipcode": 31093, "Phone": "(995) 623-6785", "Fax": "(995) 623-6786", "Website": "http://www.nowebsiteultimategadget.com" }, { "ID": 8, "CompanyName": "EZ Stop", "Address": "618 Michillinda Ave.", "City": "Arcadia", "State": "California", "Zipcode": 91007, "Phone": "(626) 265-8632", "Fax": "(626) 265-8633", "Website": "http://www.nowebsiteezstop.com" }, { "ID": 9, "CompanyName": "Clicker", "Address": "1100 W. Artesia Blvd.", "City": "Compton", "State": "California", "Zipcode": 90220, "Phone": "(310) 884-9000", "Fax": "(310) 884-9001", "Website": "http://www.nowebsiteclicker.com" }, { "ID": 10, "CompanyName": "Store of America", "Address": "2401 Utah Ave. South", "City": "Seattle", "State": "Washington", "Zipcode": 98134, "Phone": "(206) 447-1575", "Fax": "(206) 447-1576", "Website": "http://www.nowebsiteamerica.com" }, { "ID": 11, "CompanyName": "Zone Toys", "Address": "1945 S Cienega Boulevard", "City": "Los Angeles", "State": "California", "Zipcode": 90034, "Phone": "(310) 237-5642", "Fax": "(310) 237-5643", "Website": "http://www.nowebsitezonetoys.com" }, { "ID": 12, "CompanyName": "ACME", "Address": "2525 E El Segundo Blvd", "City": "El Segundo", "State": "California", "Zipcode": 90245, "Phone": "(310) 536-0611", "Fax": "(310) 536-0612", "Website": "http://www.nowebsiteacme.com" }]
[ { "ID": 1, "name": "Stores", "expanded": true }, { "ID": "1_1", "categoryId": 1, "name": "Super Mart of the West", "expanded": true }, { "ID": "1_1_1", "categoryId": "1_1", "name": "Video Players" }, { "ID": "1_1_1_1", "categoryId": "1_1_1", "name": "HD Video Player", "price": 220 }, { "ID": "1_1_1_2", "categoryId": "1_1_1", "name": "SuperHD Video Player", "price": 270 }, { "ID": "1_1_2", "categoryId": "1_1", "name": "Televisions", "expanded": true }, { "ID": "1_1_2_1", "categoryId": "1_1_2", "name": "SuperLCD 42", "price": 1200 }, { "ID": "1_1_2_2", "categoryId": "1_1_2", "name": "SuperLED 42", "price": 1450 }, { "ID": "1_1_2_3", "categoryId": "1_1_2", "name": "SuperLED 50", "price": 1600 }, { "ID": "1_1_2_4", "categoryId": "1_1_2", "name": "SuperLCD 55", "price": 1750 }, { "ID": "1_1_2_5", "categoryId": "1_1_2", "name": "SuperLCD 70", "price": 4000 }, { "ID": "1_1_3", "categoryId": "1_1", "name": "Monitors" }, { "ID": "1_1_3_1", "categoryId": "1_1_3", "name": "19\"" }, { "ID": "1_1_3_1_1", "categoryId": "1_1_3_1", "name": "DesktopLCD 19", "price": 160 }, { "ID": "1_1_4", "categoryId": "1_1", "name": "Projectors" }, { "ID": "1_1_4_1", "categoryId": "1_1_4", "name": "Projector Plus", "price": 550 }, { "ID": "1_1_4_2", "categoryId": "1_1_4", "name": "Projector PlusHD", "price": 750 } ]