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Focused Row

The TreeList component can highlight the focused row. To enable this feature, set the focusedRowEnabled property to true.

To focus a row programmatically, specify the focusedRowKey property. The TreeList automatically scrolls to the focused row. You can set the autoNavigateToFocusedRow property to false to deactivate this behavior. In the UI, users can click a row to focus it. The focused row is saved in the TreeList's state.

You can use the onFocusedRowChanging and onFocusedRowChanged properties to specify a custom function that is executed before or after a row is focused.

Backend API
<template> <div> <DxTreeList id="treeList" :data-source="dataSource" :word-wrap-enabled="true" :show-borders="true" :focused-row-enabled="true" v-model:focused-row-key="focusedRowKey" parent-id-expr="Task_Parent_ID" has-items-expr="Has_Items" @focused-row-changed="onFocusedRowChanged" > <DxColumn data-field="Task_ID" width="100" alignment="left" /> <DxColumn :min-width="120" data-field="Task_Assigned_Employee_ID" caption="Assigned" > <DxLookup :data-source="taskEmployees" value-expr="ID" display-expr="Name" /> </DxColumn> <DxColumn data-field="Task_Status" caption="Status" width="160" /> <DxColumn data-field="Task_Start_Date" caption="Start Date" data-type="date" width="160" /> <DxColumn data-field="Task_Due_Date" caption="Due Date" data-type="date" width="160" /> </DxTreeList> <div class="task-info"> <div class="info"> <div class="task-subject">{{ taskSubject }}</div> <span class="task-assigned">{{ taskAssigned }}</span> <span class="start-date">{{ startDate }}</span> </div> <div class="progress"> <span class="task-status">{{ taskStatus }}</span> <span class="task-progress">{{ taskProgress }}</span> </div> </div> <div class="options"> <div class="caption">Options</div> <div class="option"> <span>Focused row key </span> <DxNumberBox id="taskId" :min="1" :max="182" :step="0" v-model:value="focusedRowKey" :input-attr="{ 'aria-label': 'Focused Row Key' }" /> </div> </div> </div> </template> <script setup lang="ts"> import { ref } from 'vue'; import { DxTreeList, DxColumn, DxLookup, DxTreeListTypes, } from 'devextreme-vue/tree-list'; import DxNumberBox from 'devextreme-vue/number-box'; import { createStore } from 'devextreme-aspnet-data-nojquery'; const url = 'https://js.devexpress.com/Demos/Mvc/api/TreeListTasks'; const taskSubject = ref(''); const taskAssigned = ref(''); const startDate = ref(''); const taskStatus = ref(''); const taskProgress = ref(''); const dataSource = createStore({ key: 'Task_ID', loadUrl: `${url}/Tasks`, onBeforeSend(_, ajaxOptions) { ajaxOptions.xhrFields = { withCredentials: true }; }, }); const taskEmployees = createStore({ key: 'ID', loadMode: 'raw', loadUrl: `${url}/TaskEmployees`, }); const focusedRowKey = ref(45); function onFocusedRowChanged(e: DxTreeListTypes.FocusedCellChangedEvent) { const rowData = e.row && e.row.data; let cellValue; let assigned; if (rowData) { cellValue = e.component.cellValue(e.row.rowIndex, 'Assigned'); taskEmployees.byKey(cellValue).done((item) => { assigned = item.Name; }); taskSubject.value = rowData.Task_Subject; taskAssigned.value = assigned; startDate.value = new Date(rowData.Task_Start_Date).toLocaleDateString(); taskStatus.value = rowData.Task_Status; taskProgress.value = rowData.Task_Completion ? `${rowData.Task_Completion}%` : ''; } } </script>
window.exports = window.exports || {}; window.config = { transpiler: 'plugin-babel', meta: { '*.vue': { loader: 'vue-loader', }, '*.ts': { loader: 'demo-ts-loader', }, '*.svg': { loader: 'svg-loader', }, 'devextreme/time_zone_utils.js': { 'esModule': true, }, 'devextreme/localization.js': { 'esModule': true, }, 'devextreme/viz/palette.js': { 'esModule': true, }, 'devextreme-aspnet-data-nojquery': { 'esModule': true, }, }, paths: { 'root:': '../../../../', 'npm:': 'https://unpkg.com/', }, map: { 'vue': 'npm:vue@3.2.47/dist/vue.esm-browser.js', 'vue-loader': 'npm:dx-systemjs-vue-browser@1.1.1/index.js', 'demo-ts-loader': 'root:utils/demo-ts-loader.js', 'svg-loader': 'root:utils/svg-loader.js', 'devextreme-aspnet-data-nojquery': 'npm:devextreme-aspnet-data-nojquery@3.0.0/index.js', 'mitt': 'npm:mitt/dist/mitt.umd.js', 'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.28.1/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@24.1.4/cjs', 'devextreme-vue': 'npm:devextreme-vue@24.1.4/cjs', 'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.2.10/dist/dx-diagram.js', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.56/dist/dx-gantt.js', '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.13', 'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js', 'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js', 'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js', 'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js', 'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js', 'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js', 'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js', 'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.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', // Prettier 'prettier/standalone': 'npm:prettier@2.8.8/standalone.js', 'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.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', }, }, packageConfigPaths: [ 'npm:@devextreme/*/package.json', 'npm:@devextreme/runtime@3.0.13/inferno/package.json', ], babelOptions: { sourceMaps: false, stage0: true, }, }; System.config(window.config);
import { createApp } from 'vue'; import App from './App.vue'; createApp(App).mount('#app');
#treeList { max-height: 400px; } .task-info { font-family: "Segoe UI"; min-height: 100px; display: flex; flex-wrap: nowrap; border: 2px solid rgba(0, 0, 0, 0.1); padding: 16px; box-sizing: border-box; align-items: center; justify-content: space-between; } .info { display: flex; flex-direction: column; } .task-subject { line-height: 29px; font-size: 18px; font-weight: bold; } .progress { display: flex; flex-direction: column; white-space: pre; min-width: 105px; } .task-progress { line-height: 42px; font-size: 40px; font-weight: bold; } .options { margin-top: 20px; padding: 20px; background-color: rgba(191, 191, 191, 0.15); position: relative; } .caption { font-size: 18px; font-weight: 500; } .option { margin-top: 10px; } .option > .dx-numberbox { width: 200px; display: inline-block; vertical-align: middle; } .option > span { margin-right: 10px; }
<!DOCTYPE html> <html lang="en"> <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=5.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/24.1.4/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="https://unpkg.com/typescript@4.9.5/lib/typescript.js"></script> <script type="module"> import * as vueCompilerSFC from "https://unpkg.com/@vue/compiler-sfc@3.4.16/dist/compiler-sfc.esm-browser.js"; window.vueCompilerSFC = vueCompilerSFC; </script> <script src="https://unpkg.com/core-js@2.6.12/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.ts"); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> </body> </html>

In this demo, the row with the 45 key is focused initially. You can specify the focusedRowKey property via the input field below the TreeList. The onFocusedRowChanged function is used to display additional information below the component when the focused row changes.