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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.

Backend API
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import React from 'react'; import SelectBox from 'devextreme-react/select-box'; import { Template } from 'devextreme-react/core/template'; import { products, simpleProducts } from './data.js'; import ImageIcon from './imageIcon.js'; import IndicatorIcon from './indicatorIcon.js'; import ConditionalIcon from './conditionalIcon.js'; import Item from './item.js'; class App extends React.Component { constructor(props) { super(props); this.deferredProducts = { loadMode: 'raw', load: () => { this.setState({ isLoaded: false }); const promise = new Promise((resolve) => { setTimeout(() => { resolve(simpleProducts); this.setState({ isLoaded: true }); }, 3000); }); return promise; }, }; this.state = { selectedItem: products[0], isLoaded: true, }; this.renderLoadIndicator = this.renderLoadIndicator.bind(this); this.renderConditionalIcon = this.renderConditionalIcon.bind(this); this.selectionChanged = this.selectionChanged.bind(this); } render() { return ( <div className='dx-fieldset'> <div className='dx-field'> <div className='dx-field-label'>Image as the icon</div> <div className='dx-field-value'> <SelectBox dataSource={simpleProducts} dropDownButtonRender={ImageIcon} /> </div> </div> <div className='dx-field'> <div className='dx-field-label'>Load indicator as the icon</div> <div className='dx-field-value'> <SelectBox dataSource={this.deferredProducts} dropDownButtonTemplate='loadIndicator'> <Template name='loadIndicator' render={this.renderLoadIndicator} /> </SelectBox> </div> </div> <div className='dx-field'> <div className='dx-field-label'>Value-dependent icon</div> <div className='dx-field-value'> <SelectBox dataSource={products} defaultValue={products[0].ID} selectedItem={this.state.selectedItem} displayExpr='Name' showClearButton={true} valueExpr='ID' itemRender={Item} dropDownButtonTemplate='conditionalIcon' onSelectionChanged={this.selectionChanged} > <Template name='conditionalIcon' render={this.renderConditionalIcon} /> </SelectBox> </div> </div> </div> ); } renderLoadIndicator() { return <IndicatorIcon isLoaded={this.state.isLoaded} />; } renderConditionalIcon() { return <ConditionalIcon value={this.state.selectedItem} />; } selectionChanged({ selectedItem }) { this.setState({ selectedItem }); } } export default App;
import React from 'react'; export default function ConditionalIcon({ value }) { if (value) { return ( <img src={`../../../../images/icons/${value.IconSrc}`} className='custom-icon' /> ); } return ( <div className='dx-dropdowneditor-icon'></div> ); }
import React from 'react'; export default function ImageIcon() { return ( <img src="../../../../images/icons/custom-dropbutton-icon.svg" className="custom-icon" /> ); }
import React from 'react'; import LoadIndicator from 'devextreme-react/load-indicator'; export default function IndicatorIcon({ isLoaded }) { return ( <span> <LoadIndicator visible={!isLoaded} /> <span hidden={!isLoaded}> <img src='../../../../images/icons/custom-dropbutton-icon.svg' className='custom-icon' /> </span> </span> ); }
import React from 'react'; export default function Item({ IconSrc, Name }) { return ( <div className='custom-item'> <img src={`../../../../images/icons/${IconSrc}`} /> <div className='product-name'> { Name } </div> </div> ); }
import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render( <App />, document.getElementById('app'), );
<!DOCTYPE html> <html> <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" /> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script type="text/javascript" src="config.js"></script> <script type="text/javascript"> System.import("./index.js"); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> </body> </html>
.dx-dropdowneditor-button .dx-button-content { text-align: center; } .dx-theme-material .dx-dropdowneditor-button .dx-button-content .dx-loadindicator { width: 24px; height: 24px; } .custom-icon { max-height: 100%; max-width: 100%; font-size: 28px; display: inline-block; vertical-align: middle; } .dx-theme-android5 .custom-item img { padding: 4px 22px 0 0; } .custom-item img { float: right; } .custom-item .product-name { line-height: 32px; padding-left: 5px; }
export const simpleProducts = [ 'HD Video Player', 'SuperHD Video Player', 'SuperPlasma 50', 'SuperLED 50', 'SuperLED 42', ]; export const products = [{ 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', }];
window.config = { transpiler: 'plugin-babel', meta: { 'devextreme/localization.js': { 'esModule': true, }, }, paths: { 'npm:': 'https://unpkg.com/', }, defaultExtension: 'js', map: { 'react': 'npm:react@17.0.2/umd/react.development.js', 'react-dom': 'npm:react-dom@17.0.2/umd/react-dom.development.js', 'prop-types': 'npm:prop-types@15.7.2/prop-types.js', '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-react': 'npm:devextreme-react@21.2.3', '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/dist/dx-diagram.js', 'devexpress-gantt': 'npm:devexpress-gantt@3.1.24/dist/dx-gantt.js', '@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', // SystemJS plugins 'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js', }, packages: { 'devextreme': { defaultExtension: 'js', }, '@devextreme/vdom': { defaultExtension: 'js', }, 'devextreme-react': { main: 'index.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', ], babelOptions: { sourceMaps: false, stage0: true, react: true, }, }; System.config(window.config);