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Select Box

Customize Drop-Down Button

Use the dropDownButtonTemplate to customize the drop-down button. This demo illustrates three customization cases:

  • Custom image
    Declare an img element in the template.

  • Load indicator
    Declare the load indicator and a regular icon in the template. Display the load indicator while hiding the icon, and vice versa.

  • Icon that depends on the selected value
    Declare the default and the selected item's icon in the template. If there is a selected item, display its icon; otherwise, show the default icon.

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<div class="dx-fieldset"> <div class="dx-field"> <div class="dx-field-label">Image as the icon</div> <div class="dx-field-value"> <dx-select-box [dataSource]="simpleProducts"> <div *dxTemplate="let data of 'dropDownButton'"> <img src="../../../../images/icons/custom-dropbutton-icon.svg" class="custom-icon" /> </div> </dx-select-box> </div> </div> <div class="dx-field"> <div class="dx-field-label">Load indicator as the icon</div> <div class="dx-field-value"> <dx-select-box [dataSource]="deferredProducts"> <div *dxTemplate="let data of 'dropDownButton'"> <dx-load-indicator [visible]="!isLoaded"></dx-load-indicator> <span [hidden]="!isLoaded"> <img src="../../../../images/icons/custom-dropbutton-icon.svg" class="custom-icon" /> </span> </div> </dx-select-box> </div> </div> <div class="dx-field"> <div class="dx-field-label">Value-dependent icon</div> <div class="dx-field-value"> <dx-select-box [dataSource]="products" [(selectedItem)]="selectedItem" [value]="1" showClearButton="true" displayExpr="Name" valueExpr="ID" > <div *dxTemplate="let data of 'dropDownButton'"> <img *ngIf="selectedItem" src="../../../../images/icons/{{ selectedItem.IconSrc }}" class="custom-icon" /> <div *ngIf="!selectedItem" class="dx-dropdowneditor-icon"></div> </div> <div *dxTemplate="let data of 'item'" class="custom-item"> <img src="../../../../images/icons/{{ data.IconSrc }}" /> <div class="product-name">{{ data.Name }}</div> </div> </dx-select-box> </div> </div> </div>
import { NgModule, Component, enableProdMode } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { DxSelectBoxModule, DxLoadIndicatorModule, DxTemplateModule, } from 'devextreme-angular'; import ArrayStore from 'devextreme/data/array_store'; import { Product, Service } from './app.service'; if (!/localhost/.test(document.location.host)) { enableProdMode(); } @Component({ selector: 'demo-app', templateUrl: 'app/app.component.html', styleUrls: ['app/app.component.css'], providers: [Service], }) export class AppComponent { simpleProducts: string[]; products: Product[]; data: any; isLoaded = true; selectedItem: Product; deferredProducts: any; constructor(service: Service) { const that = this; this.products = service.getProducts(); this.selectedItem = this.products[0]; this.simpleProducts = service.getSimpleProducts(); this.deferredProducts = { loadMode: 'raw', load() { that.isLoaded = false; const promise = new Promise((resolve, reject) => { setTimeout(() => { resolve(that.simpleProducts); that.isLoaded = true; }, 3000); }); return promise; }, }; } } @NgModule({ imports: [ BrowserModule, DxSelectBoxModule, DxLoadIndicatorModule, DxTemplateModule, ], declarations: [AppComponent], bootstrap: [AppComponent], }) export class AppModule { } platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep .dx-dropdowneditor-button .dx-button-content { text-align: center; } ::ng-deep .dx-theme-material .dx-dropdowneditor-button .dx-button-content .dx-loadindicator { width: 24px; height: 24px; } ::ng-deep .custom-icon { max-height: 100%; max-width: 100%; font-size: 28px; display: inline-block; vertical-align: middle; } ::ng-deep .dx-theme-android5 .custom-item img { padding: 4px 22px 0 0; } ::ng-deep .custom-item img { float: right; } ::ng-deep .custom-item .product-name { line-height: 32px; padding-left: 5px; }
import { Injectable } from '@angular/core'; export class Product { ID: number; Name: string; Price: number; Current_Inventory: number; Backorder: number; Manufacturing: number; Category: string; IconSrc: string; } const simpleProducts: string[] = [ 'HD Video Player', 'SuperHD Video Player', 'SuperPlasma 50', 'SuperLED 50', 'SuperLED 42', ]; const products: Product[] = [{ ID: 1, Name: 'HD Video Player', Price: 330, Current_Inventory: 225, Backorder: 0, Manufacturing: 10, Category: 'Video Players', IconSrc: 'video-player.svg', }, { ID: 2, Name: 'SuperHD Player', Price: 400, Current_Inventory: 150, Backorder: 0, Manufacturing: 25, Category: 'Video Players', IconSrc: 'video-player.svg', }, { ID: 3, Name: 'SuperPlasma 50', Price: 2400, Current_Inventory: 0, Backorder: 0, Manufacturing: 0, Category: 'Televisions', IconSrc: 'tv.svg', }, { ID: 4, Name: 'SuperLED 50', Price: 1600, Current_Inventory: 77, Backorder: 0, Manufacturing: 55, Category: 'Televisions', IconSrc: 'tv.svg', }, { ID: 5, Name: 'SuperLED 42', Price: 1450, Current_Inventory: 445, Backorder: 0, Manufacturing: 0, Category: 'Televisions', IconSrc: 'tv.svg', }]; @Injectable() export class Service { getSimpleProducts(): string[] { return simpleProducts; } getProducts(): Product[] { return products; } }
// 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>