Angular Tree List - 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

<dx-tree-list id="treeList" [dataSource]="dataSource" parentIdExpr="Task_Parent_ID" wordWrapEnabled="true" showBorders="true" focusedRowEnabled="true" hasItemsExpr="Has_Items" [(focusedRowKey)]="focusedRowKey" (onFocusedRowChanged)="onFocusedRowChanged($event)" > <dxo-tree-list-remote-operations [filtering]="true" [sorting]="true" [grouping]="true" ></dxo-tree-list-remote-operations> <dxi-tree-list-column dataField="Task_ID" width="100" alignment="left" ></dxi-tree-list-column> <dxi-tree-list-column dataField="Task_Assigned_Employee_ID" caption="Assigned" minWidth="120" > <dxo-tree-list-lookup [dataSource]="taskEmployees" valueExpr="ID" displayExpr="Name" ></dxo-tree-list-lookup> </dxi-tree-list-column> <dxi-tree-list-column dataField="Task_Status" caption="Status" width="160" ></dxi-tree-list-column> <dxi-tree-list-column dataField="Task_Start_Date" caption="Start Date" dataType="date" width="160" ></dxi-tree-list-column> <dxi-tree-list-column dataField="Task_Due_Date" caption="Due Date" dataType="date" width="160" ></dxi-tree-list-column> </dx-tree-list> <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> <dx-number-box id="taskId" min="1" max="182" step="0" [(value)]="focusedRowKey" [inputAttr]="{ 'aria-label': 'Focused Row Key' }" > </dx-number-box> </div> </div>

import { bootstrapApplication } from '@angular/platform-browser'; import { Component, enableProdMode, provideZoneChangeDetection } from '@angular/core'; import * as AspNetData from 'devextreme-aspnet-data-nojquery'; import { DxNumberBoxModule } from 'devextreme-angular'; import { DxTreeListModule, DxTreeListTypes } from 'devextreme-angular/ui/tree-list'; if (!/localhost/.test(document.location.host)) { enableProdMode(); } const url = 'https://js.devexpress.com/Demos/NetCore/api/TreeListTasks'; @Component({ selector: 'demo-app', templateUrl: './app.component.html', styleUrls: ['./app.component.css'], preserveWhitespaces: true, imports: [ DxTreeListModule, DxNumberBoxModule, ], }) export class AppComponent { taskSubject: string; taskAssigned: string; startDate: string; taskStatus: string; taskProgress: string; focusedRowKey = 45; dataSource = AspNetData.createStore({ key: 'Task_ID', loadUrl: `${url}/Tasks`, onBeforeSend(_, ajaxOptions) { ajaxOptions.xhrFields = { withCredentials: true }; }, }); taskEmployees = AspNetData.createStore({ key: 'ID', loadMode: 'raw', loadUrl: `${url}/TaskEmployees`, }); onFocusedRowChanged(e: DxTreeListTypes.FocusedRowChangedEvent) { const rowData = e.row?.data; let cellValue: unknown; let assigned: string; if (rowData) { cellValue = e.component.cellValue(e.row.rowIndex, 'Assigned'); this.taskEmployees.byKey(cellValue).done(({ Name }) => { assigned = Name; }); this.taskSubject = rowData.Task_Subject; this.taskAssigned = assigned; this.startDate = new Date(rowData.Task_Start_Date).toLocaleDateString(); this.taskStatus = rowData.Task_Status; this.taskProgress = rowData.Task_Completion ? `${rowData.Task_Completion}%` : ''; } } } bootstrapApplication(AppComponent, { providers: [ provideZoneChangeDetection({ eventCoalescing: true, runCoalescing: true }), ], });

#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/26.1.5/css/dx.light.css" /> </head> <body class="dx-viewport"> <div class="demo-container"> <demo-app>Loading...</demo-app> </div> <script src="https://cdn.jsdelivr.net/npm/zone.js@0.16.2/bundles/zone.umd.js"></script> <script src="./bundle.js" type="module"></script> </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.