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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
@(Html.DevExtreme().TreeList() .ID("treeList") .DataSource(d => d.WebApi() .Controller("TreeListTasks/Tasks") .Key("Task_ID")) .ParentIdExpr("Task_Parent_ID") .HasItemsExpr("Has_Items") .Columns(columns => { columns.Add() .DataField("Task_ID") .Alignment(HorizontalAlignment.Left) .Width(100); columns.Add() .DataField("Task_Assigned_Employee_ID") .Caption("Assigned") .MinWidth(120) .Lookup(l => { l.DataSource(d => d.WebApi().Key("ID").LoadMode(DataSourceLoadMode.Raw).Controller("TreeListTasks/TaskEmployees")); l.ValueExpr("ID"); l.DisplayExpr("Name"); }); columns.Add() .DataField("Task_Status") .Caption("Status") .Width(160); columns.Add() .DataField("Task_Start_Date") .Caption("Start Date") .DataType(GridColumnDataType.Date) .Width(160); columns.Add() .DataField("Task_Due_Date") .Caption("Due Date") .DataType(GridColumnDataType.Date) .Width(160); }) .FocusedRowEnabled(true) .FocusedRowKey(4) .ShowBorders(true) .OnInitialized("onDataGridInitialized") .OnFocusedRowChanged("onFocusedRowChanged") ) <div class="task-info"> <div class="info"> <div class="task-subject"></div> <span class="task-assigned"></span> <span class="start-date"></span> </div> <div class="progress"> <span class="task-status"></span> <span class="task-progress"></span> </div> </div> <div class="options"> <div class="caption">Options</div> <div class="option"> <span>Focused row key</span> @(Html.DevExtreme().NumberBox() .ID("taskId") .Min(1) .Max(182) .Step(0) .InputAttr("aria-label", "Focused Row Key") .OnInitialized("onTaskIdEditorInitialized") .OnValueChanged("onTaskIdEditorValueChanged") ) </div> </div> <script> var treeList, taskIdEditor; function onTaskIdEditorInitialized(e) { taskIdEditor = e.component; } function onTaskIdEditorValueChanged(e) { if (e.event && e.value > 0) { treeList.option("focusedRowKey", e.value); } } function onDataGridInitialized(e) { treeList = e.component; } function onFocusedRowChanged(e) { var rowData = e.row &&, cellValue, assigned, taskEmployees = e.component.columnOption("Assigned").lookup.dataSource; if (rowData) { cellValue = e.component.cellValue(e.row.rowIndex, "Assigned"); => { assigned = item.Name; }); $(".task-subject").html(rowData.Task_Subject); $(".task-assigned").html(assigned); $(".start-date").html(new Date(rowData.Task_Start_Date).toLocaleDateString()); $(".task-status").html(rowData.Task_Status); var progress = rowData.Task_Completion ? rowData.Task_Completion + "%" : ""; $(".task-progress").text(progress); $("#taskId").dxNumberBox("instance").option("value", treeList.option("focusedRowKey")); } } </script>
using System.Web.Mvc; using DevExtreme.MVC.Demos.Models.SampleData; namespace DevExtreme.MVC.Demos.Controllers { public class TreeListController : Controller { public ActionResult FocusedRow() { return View(); } } }
#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; }

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.