JavaScript/jQuery Tree List - Focused Row

The JavaScript 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 JavaScript 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 JavaScript 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.

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Backend API

$(() => { const url = 'https://js.devexpress.com/Demos/Mvc/api/TreeListTasks'; const taskEmployees = DevExpress.data.AspNet.createStore({ key: 'ID', loadMode: 'raw', loadUrl: `${url}/TaskEmployees`, }); const treeList = $('#treeList').dxTreeList({ dataSource: DevExpress.data.AspNet.createStore({ key: 'Task_ID', loadUrl: `${url}/Tasks`, onBeforeSend(_, ajaxOptions) { ajaxOptions.xhrFields = { withCredentials: true }; }, }), remoteOperations: { filtering: true, sorting: true, grouping: true, }, parentIdExpr: 'Task_Parent_ID', hasItemsExpr: 'Has_Items', focusedRowEnabled: true, focusedRowKey: 45, showBorders: true, wordWrapEnabled: true, columns: [ { dataField: 'Task_ID', width: 100, alignment: 'left', }, { dataField: 'Task_Assigned_Employee_ID', caption: 'Assigned', minWidth: 120, lookup: { dataSource: taskEmployees, valueExpr: 'ID', displayExpr: 'Name', }, }, { dataField: 'Task_Status', caption: 'Status', width: 160, }, { dataField: 'Task_Start_Date', caption: 'Start Date', dataType: 'date', width: 160, }, { dataField: 'Task_Due_Date', caption: 'Due Date', dataType: 'date', width: 160, }, ], onFocusedRowChanged(e) { 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; }); $('.task-subject').html(rowData.Task_Subject); $('.task-assigned').html(assigned); $('.start-date').html(new Date(rowData.Task_Start_Date).toLocaleDateString()); $('.task-status').html(rowData.Task_Status); const progress = rowData.Task_Completion ? `${rowData.Task_Completion}%` : ''; $('.task-progress').text(progress); } $('#taskId').dxNumberBox('instance').option('value', treeList.option('focusedRowKey')); }, }).dxTreeList('instance'); $('#taskId').dxNumberBox({ min: 1, max: 182, step: 0, inputAttr: { 'aria-label': 'Focused Row Key' }, onValueChanged(e) { if (e.event && e.value > 0) { treeList.option('focusedRowKey', e.value); } }, }); });

<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" 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" /> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> <script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/24.1.6/css/dx.light.css" /> <script src="js/dx.all.js"></script> <script src="https://unpkg.com/devextreme-aspnet-data@4.0.0/js/dx.aspnet.data.js"></script> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="index.js"></script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="treeList"></div> <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> <div id="taskId"></div> </div> </div> </div> </body> </html>

#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 JavaScript TreeList. The onFocusedRowChanged function is used to display additional information below the component when the focused row changes.