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Drop Down Box

Single Selection

The DropDownBox UI component is an editor that consists of a text field and drop-down content. In this demo, the content is the TreeView and the DataGrid in the single selection mode.

The following instructions show how to synchronize the DropDownBox with any other embedded DevExtreme UI component:

  1. Specify data sources
    The DropDownBox's and embedded UI component's data sources can be the same or different. If they are different, the UI component's key field should be present in the DropDownBox's data source.

  2. Specify which data field provides the DropDownBox's values and the embedded UI component's keys
    Assign the field's name to the DropDownBox's valueExpr property and to the key property of the embedded UI component's store.

  3. Synchronize the DropDownBox's value and the embedded UI component's selection
    Bind the DropDownBox's value and the UI component's selectedRowKeys/selectedItemKeys property to the same variable.

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<template> <div class="dx-fieldset"> <div class="dx-field"> <div class="dx-field-label">DropDownBox with embedded TreeView</div> <div class="dx-field-value"> <DxDropDownBox v-model:value="treeBoxValue" :show-clear-button="true" :data-source="treeDataSource" value-expr="ID" display-expr="name" placeholder="Select a value..." @value-changed="syncTreeViewSelection($event)" > <template #content="{ data }"> <DxTreeView :ref="treeViewRefName" :data-source="treeDataSource" :select-by-click="true" data-structure="plain" key-expr="ID" parent-id-expr="categoryId" selection-mode="single" display-expr="name" @content-ready="$event.component.selectItem(treeBoxValue)" @item-selection-changed="treeView_itemSelectionChanged($event)" /> </template> </DxDropDownBox> </div> </div> <div class="dx-field"> <div class="dx-field-label">DropDownBox with embedded DataGrid</div> <div class="dx-field-value"> <DxDropDownBox v-model:value="gridBoxValue" :defer-rendering="false" :display-expr="gridBoxDisplayExpr" :show-clear-button="true" :data-source="gridDataSource" value-expr="ID" placeholder="Select a value..." > <template #content="{ data }"> <DxDataGrid :data-source="gridDataSource" :columns="gridColumns" :hover-state-enabled="true" v-model:selected-row-keys="gridBoxValue" height="100%" > <DxSelection mode="single"/> <DxPaging :enabled="true" :page-size="10" /> <DxFilterRow :visible="true"/> <DxScrolling mode="infinite"/> </DxDataGrid> </template> </DxDropDownBox> </div> </div> </div> </template> <script> import DxDropDownBox from 'devextreme-vue/drop-down-box'; import DxTreeView from 'devextreme-vue/tree-view'; import { DxDataGrid, DxSelection, DxPaging, DxFilterRow, DxScrolling } from 'devextreme-vue/data-grid'; import CustomStore from 'devextreme/data/custom_store'; import 'whatwg-fetch'; export default { components: { DxDropDownBox, DxTreeView, DxDataGrid, DxSelection, DxPaging, DxFilterRow, DxScrolling }, data() { return { treeDataSource: null, treeBoxValue: null, gridDataSource: null, gridBoxValue: [3], treeViewRefName: 'tree-view', gridColumns: ['CompanyName', 'City', 'Phone'] }; }, created() { this.treeDataSource = this.makeAsyncDataSource('treeProducts.json'); this.gridDataSource = this.makeAsyncDataSource('customers.json'); this.treeBoxValue = '1_1'; }, methods: { makeAsyncDataSource(jsonFile) { return new CustomStore({ loadMode: 'raw', key: 'ID', load: function() { return fetch(`../../../../data/${ jsonFile}`) .then(response => response.json()); } }); }, syncTreeViewSelection() { if (!this.$refs[this.textBoxRefName]) return; if (!this.treeBoxValue) { this.$refs[this.textBoxRefName].instance.unselectAll(); } else { this.$refs[this.textBoxRefName].instance.selectItem(this.treeBoxValue); } }, treeView_itemSelectionChanged(e) { this.treeBoxValue = e.component.getSelectedNodeKeys(); }, gridBoxDisplayExpr(item) { return item && `${item.CompanyName } <${ item.Phone }>`; } } }; </script> <style scoped> .dx-fieldset { height: 500px; } </style>
import { createApp } from 'vue'; import App from './App.vue'; createApp(App).mount('#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/20.2.5/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.5/css/dx.light.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>
const products = [{ id: '1', text: 'Stores', expanded: true, items: [{ id: '1_1', text: 'Super Mart of the West', expanded: true, items: [{ id: '1_1_1', text: 'Video Players', items: [{ id: '1_1_1_1', text: 'HD Video Player', price: 220, image: '../../../../images/products/1.png' }, { id: '1_1_1_2', text: 'SuperHD Video Player', image: '../../../../images/products/2.png', price: 270 }] }, { id: '1_1_2', text: 'Televisions', expanded: true, items: [{ id: '1_1_2_1', text: 'SuperLCD 42', image: '../../../../images/products/7.png', price: 1200 }, { id: '1_1_2_2', text: 'SuperLED 42', image: '../../../../images/products/5.png', price: 1450 }, { id: '1_1_2_3', text: 'SuperLED 50', image: '../../../../images/products/4.png', price: 1600 }, { id: '1_1_2_4', text: 'SuperLCD 55', image: '../../../../images/products/6.png', price: 1350 }, { id: '1_1_2_5', text: 'SuperLCD 70', image: '../../../../images/products/9.png', price: 4000 }] }, { id: '1_1_3', text: 'Monitors', expanded: true, items: [{ id: '1_1_3_1', text: '19"', expanded: true, items: [{ id: '1_1_3_1_1', text: 'DesktopLCD 19', image: '../../../../images/products/10.png', price: 160 }] }, { id: '1_1_3_2', text: '21"', items: [{ id: '1_1_3_2_1', text: 'DesktopLCD 21', image: '../../../../images/products/12.png', price: 170 }, { id: '1_1_3_2_2', text: 'DesktopLED 21', image: '../../../../images/products/13.png', price: 175 }] }] }, { id: '1_1_4', text: 'Projectors', items: [{ id: '1_1_4_1', text: 'Projector Plus', image: '../../../../images/products/14.png', price: 550 }, { id: '1_1_4_2', text: 'Projector PlusHD', image: '../../../../images/products/15.png', price: 750 }] }] }, { id: '1_2', text: 'Braeburn', items: [{ id: '1_2_1', text: 'Video Players', items: [{ id: '1_2_1_1', text: 'HD Video Player', image: '../../../../images/products/1.png', price: 240 }, { id: '1_2_1_2', text: 'SuperHD Video Player', image: '../../../../images/products/2.png', price: 300 }] }, { id: '1_2_2', text: 'Televisions', items: [{ id: '1_2_2_1', text: 'SuperPlasma 50', image: '../../../../images/products/3.png', price: 1800 }, { id: '1_2_2_2', text: 'SuperPlasma 65', image: '../../../../images/products/8.png', price: 3500 }] }, { id: '1_2_3', text: 'Monitors', items: [{ id: '1_2_3_1', text: '19"', items: [{ id: '1_2_3_1_1', text: 'DesktopLCD 19', image: '../../../../images/products/10.png', price: 170 }] }, { id: '1_2_3_2', text: '21"', items: [{ id: '1_2_3_2_1', text: 'DesktopLCD 21', image: '../../../../images/products/12.png', price: 180 }, { id: '1_2_3_2_2', text: 'DesktopLED 21', image: '../../../../images/products/13.png', price: 190 }] }] }] }, { id: '1_3', text: 'E-Mart', items: [{ id: '1_3_1', text: 'Video Players', items: [{ id: '1_3_1_1', text: 'HD Video Player', image: '../../../../images/products/1.png', price: 220 }, { id: '1_3_1_2', text: 'SuperHD Video Player', image: '../../../../images/products/2.png', price: 275 }] }, { id: '1_3_3', text: 'Monitors', items: [{ id: '1_3_3_1', text: '19"', items: [{ id: '1_3_3_1_1', text: 'DesktopLCD 19', image: '../../../../images/products/10.png', price: 165 }] }, { id: '1_3_3_2', text: '21"', items: [{ id: '1_3_3_2_1', text: 'DesktopLCD 21', image: '../../../../images/products/12.png', price: 175 }] }] }] }, { id: '1_4', text: 'Walters', items: [{ id: '1_4_1', text: 'Video Players', items: [{ id: '1_4_1_1', text: 'HD Video Player', image: '../../../../images/products/1.png', price: 210 }, { id: '1_4_1_2', text: 'SuperHD Video Player', image: '../../../../images/products/2.png', price: 250 }] }, { id: '1_4_2', text: 'Televisions', items: [{ id: '1_4_2_1', text: 'SuperLCD 42', image: '../../../../images/products/7.png', price: 1100 }, { id: '1_4_2_2', text: 'SuperLED 42', image: '../../../../images/products/5.png', price: 1400 }, { id: '1_4_2_3', text: 'SuperLED 50', image: '../../../../images/products/4.png', price: 1500 }, { id: '1_4_2_4', text: 'SuperLCD 55', image: '../../../../images/products/6.png', price: 1300 }, { id: '1_4_2_5', text: 'SuperLCD 70', image: '../../../../images/products/9.png', price: 4000 }, { id: '1_4_2_6', text: 'SuperPlasma 50', image: '../../../../images/products/3.png', price: 1700 }] }, { id: '1_4_3', text: 'Monitors', items: [{ id: '1_4_3_1', text: '19"', items: [{ id: '1_4_3_1_1', text: 'DesktopLCD 19', image: '../../../../images/products/10.png', price: 160 }] }, { id: '1_4_3_2', text: '21"', items: [{ id: '1_4_3_2_1', text: 'DesktopLCD 21', image: '../../../../images/products/12.png', price: 170 }, { id: '1_4_3_2_2', text: 'DesktopLED 21', image: '../../../../images/products/13.png', price: 180 }] }] }, { id: '1_4_4', text: 'Projectors', items: [{ id: '1_4_4_1', text: 'Projector Plus', image: '../../../../images/products/14.png', price: 550 }, { id: '1_4_4_2', text: 'Projector PlusHD', image: '../../../../images/products/15.png', price: 750 }] }] }] }]; export default { getProducts() { return products; } };
System.config({ transpiler: 'plugin-babel', meta: { '*.vue': { loader: 'vue-loader' }, 'devextreme/localization.js': { "esModule": true }, }, paths: { 'npm:': 'https://unpkg.com/' }, map: { 'vue': 'npm:vue@3.0.0/dist/vue.esm-browser.js', 'vue-loader': 'npm:dx-systemjs-vue-browser@1.0.15/index.js', 'whatwg-fetch': 'npm:whatwg-fetch@2.0.4/fetch.js', 'mitt': 'npm:mitt/dist/mitt.umd.js', '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@20.2.5', 'devextreme-vue': 'npm:devextreme-vue@20.2.5', 'jszip': 'npm:jszip@3.5.0/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@0.9.8/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.0.11/dist/dx-diagram.js', 'devexpress-gantt': 'npm:devexpress-gantt@2.0.18/dist/dx-gantt.js', 'preact': 'npm:preact@10.5.11/dist/preact.js', 'preact/hooks': 'npm:preact@10.5.11/hooks/dist/hooks.js', '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-vue': { main: 'index.js' }, 'devextreme': { defaultExtension: 'js' }, 'devextreme/events/utils': { main: 'index' }, 'devextreme/events': { main: 'index' }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js' } }, babelOptions: { sourceMaps: false, stage0: true } });