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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.
Feel free to share demo-related thoughts here.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
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We appreciate your feedback.
<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));
}
}
treeView_itemSelectionChanged(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/
System.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': 'npm:@angular',
'tslib': 'npm:tslib@2.0.3/tslib.js',
'rxjs': 'npm:rxjs@6.3.3',
'rrule': 'npm:rrule@2.6.6/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.25.0/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@20.2.4',
'jszip': 'npm:jszip@3.5.0/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@0.9.7/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.0.5',
'devexpress-gantt': 'npm:devexpress-gantt@2.0.8',
'devextreme-angular': 'npm:devextreme-angular@20.2.4',
'preact': 'npm:preact@10.5.7/dist/preact.js',
'preact/hooks': 'npm:preact@10.5.7/hooks/dist/hooks.js'
},
packages: {
'app': {
main: './app.component.ts',
defaultExtension: 'ts'
},
'devextreme': {
defaultExtension: 'js'
},
'devextreme/events/utils': {
main: 'index'
},
'devextreme/events': {
main: 'index'
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js'
}
},
packageConfigPaths: [
"npm:@angular/*/package.json",
"npm:@angular/common/*/package.json",
"npm:rxjs/package.json",
"npm:rxjs/operators/package.json",
"npm:devextreme-angular/*/package.json",
"npm:devextreme-angular/ui/*/package.json",
"npm:devextreme-angular/package.json",
"npm:devexpress-diagram/package.json",
"npm:devexpress-gantt/package.json",
]
});
<!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/20.2.4/css/dx.common.css"/>
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.4/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@0.10.2/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>