Single Selection

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The DropDownBox widget is an editor that consists of a text field and drop-down content. The content can be anything. In this demo, it is the TreeView widget and the DataGrid widget. This demo also illustrates how to implement single selection and how to synchronize the DropDownBox with the nested widgets.

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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"> <dx-drop-down-box :value.sync="treeBoxValue" :show-clear-button="true" :data-source="treeDataSource" value-expr="ID" display-expr="name" placeholder="Select a value..." @value-changed="syncTreeViewSelection($event)" > <div slot="content" slot-scope="{ data }" > <dx-tree-view :ref="treeViewRefName" :data-source="treeDataSource" :select-by-click="true" data-structure="plain" key-expr="ID" parent-id-expr="categoryId" selection-mode="single" display-expr="name" @content-ready="$event.component.selectItem(treeBoxValue)" @item-selection-changed="treeView_itemSelectionChanged($event)" /> </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.sync="gridBoxValue" :defer-rendering="false" :display-expr="gridBox_displayExpr" :show-clear-button="true" :data-source="gridDataSource" value-expr="ID" placeholder="Select a value..." > <div slot="content" slot-scope="{ data }" > <dx-data-grid :data-source="gridDataSource" :columns="['CompanyName', 'City', 'Phone']" :hover-state-enabled="true" :selected-row-keys.sync="gridSelectedRowKeys" height="100%" > <dx-selection mode="single"/> <dx-paging :enabled="true" :page-size="10" /> <dx-filter-row :visible="true"/> <dx-scrolling mode="infinite"/> </dx-data-grid> </div> </dx-drop-down-box> </div> </div> </div> </template> <script> import { DxDropDownBox, DxTreeView } from 'devextreme-vue'; 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, grid_BoxValue: 3, grid_SelectedRowKeys: [3], treeViewRefName: 'tree-view' }; }, computed: { gridBoxValue: { get: function() { return this.grid_BoxValue; }, set: function(value) { this.grid_SelectedRowKeys = value && [value] || []; this.grid_BoxValue = value; } }, gridSelectedRowKeys: { get: function() { return this.grid_SelectedRowKeys; }, set: function(value) { this.grid_BoxValue = value.length && value[0] || null; this.grid_SelectedRowKeys = value; } } }, 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.$refs[this.textBoxRefName].instance.selectItem(this.treeBoxValue); } }, treeView_itemSelectionChanged(e) { this.treeBoxValue = e.component.getSelectedNodesKeys(); }, gridBox_displayExpr(item) { return item && `${item.CompanyName } <${ item.Phone }>`; } } }; </script> <style scoped> .dx-fieldset { height: 500px; } </style>

import Vue from 'vue'; import App from './App.vue'; new Vue({ el: '#app', components: { App }, template: '<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/19.1.6/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.1.6/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"> <span v-if="false">Loading...</span> </div> </div> </body> </html>

System.config({ transpiler: 'plugin-babel', paths: { 'npm:': 'https://unpkg.com/' }, map: { vue: 'npm:vue@2.6.3/dist/vue.esm.browser.js', 'vue-loader': 'npm:systemjs-vue-browser@latest/index.js', 'devextreme': 'npm:devextreme@19.1', 'devextreme-vue': 'npm:devextreme-vue@19.1', jszip: 'npm:jszip@3.1.3/dist/jszip.min.js', 'quill': 'npm:quill@1.3.6/dist/quill.js', 'devexpress-diagram': 'npm:devexpress-diagram', 'whatwg-fetch': 'npm:whatwg-fetch@2.0.4/fetch.js', 'plugin-babel': 'npm:systemjs-plugin-babel@0/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0/systemjs-babel-browser.js' }, meta: { '*.vue': { loader: 'vue-loader' } }, packages: { 'devextreme-vue': { main: 'index.js' }, 'devextreme': { defaultExtension: 'js' } }, babelOptions: { sourceMaps: false, stage0: true } });