Your search did not match any results.
Drop Down Box

Multiple Selection

If the widget 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 options are used to enable multiple selection.

Copy to CodeSandBox
Apply
Reset
<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)="syncTreeViewSelection()" > <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)="syncTreeViewSelection($event)" (onItemSelectionChanged)="treeView_itemSelectionChanged($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: 'infinite' }" [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: function() { return http.get('../../../../data/' + jsonFile) .toPromise(); } }); }; syncTreeViewSelection(e) { var component = (e && e.component) || (this.treeView && this.treeView.instance); if (!component) return; if (!this.treeBoxValue) { component.unselectAll(); } if (this.treeBoxValue) { this.treeBoxValue.forEach((function (value) { component.selectItem(value); }).bind(this)); } } getSelectedItemsKeys(items) { var result = [], that = this; items.forEach(function(item) { if(item.selected) { result.push(item.key); } if(item.items.length) { result = result.concat(that.getSelectedItemsKeys(item.items)); } }); return result; } treeView_itemSelectionChanged(e){ const nodes = e.component.getNodes(); this.treeBoxValue = this.getSelectedItemsKeys(nodes); } } @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/ System.config({ transpiler: 'ts', typescriptOptions: { module: "commonjs", emitDecoratorMetadata: true, experimentalDecorators: true }, meta: { 'typescript': { "exports": "ts" } }, paths: { 'npm:': 'https://unpkg.com/' }, map: { 'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js', 'typescript': 'npm:typescript@3.4.5/lib/typescript.js', '@angular/core': 'npm:@angular/core@8.0.0/bundles/core.umd.js', '@angular/common': 'npm:@angular/common@8.0.0/bundles/common.umd.js', '@angular/compiler': 'npm:@angular/compiler@8.0.0/bundles/compiler.umd.js', '@angular/platform-browser': 'npm:@angular/platform-browser@8.0.0/bundles/platform-browser.umd.js', '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@8.0.0/bundles/platform-browser-dynamic.umd.js', '@angular/router': 'npm:@angular/router@8.0.0/bundles/router.umd.js', '@angular/forms': 'npm:@angular/forms@8.0.0/bundles/forms.umd.js', '@angular/common/http': 'npm:@angular/common@8.0.0/bundles/common-http.umd.js', 'tslib': 'npm:tslib/tslib.js', 'rxjs': 'npm:rxjs@6.3.3', 'rxjs/operators': 'npm:rxjs@6.3.3/operators', 'devextreme': 'npm:devextreme@19.2', 'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js', 'quill': 'npm:quill@1.3.7/dist/quill.js', 'devexpress-diagram': 'npm:devexpress-diagram', 'devexpress-gantt': 'npm:devexpress-gantt', 'devextreme-angular': 'npm:devextreme-angular@19.2' }, packages: { 'app': { main: './app.component.ts', defaultExtension: 'ts' }, 'devextreme': { defaultExtension: 'js' }, 'rxjs': { main: 'index.js', defaultExtension: 'js' }, 'rxjs/operators': { main: 'index.js', defaultExtension: 'js' }, 'devextreme-angular': { main: 'index.js', defaultExtension: 'js' } } });
<!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/19.2.4/css/dx.common.css"/> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/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@0.6.25/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>