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Tree List - Customize Keyboard Navigation

The following properties customize keyboard navigation:

  • enterKeyAction
    Specifies the TreeList's actions when a user presses Enter key:

    • "moveFocus" - moves focus in the enterKeyDirection
    • "startEdit" (default) - switches the cell to the editing state
  • enterKeyDirection
    Specifies the direction in which to move focus when a user presses Enter:

    • "row"
    • "column"
    • "none" (default)
  • editOnKeyPress
    Specifies whether to start entering a new cell value on a key press.

In this demo, you can use the controls under the TreeList to change any of these properties.

Backend API
<div id="tree-list-demo"> @(Html.DevExtreme().TreeList<DevExtreme.NETCore.Demos.Models.TreeList.Employee>() .ID("treeListContainer") .DataSource(ds => ds.Mvc() .Controller("TreeListEmployees") .LoadAction("Get") .UpdateAction("Put") .Key("ID") ) .KeyExpr("ID") .ParentIdExpr("HeadID") .ColumnAutoWidth(true) .ExpandedRowKeys(new[] { 1, 2, 4, 5 }) .OnFocusedCellChanging(@<text> function(e) { e.isHighlighted = true; } </text>) .KeyboardNavigation(navigation => { navigation.EnterKeyAction(GridEnterKeyAction.MoveFocus); navigation.EnterKeyDirection(GridEnterKeyDirection.Column); navigation.EditOnKeyPress(true); }) .Editing(editing => { editing.Mode(GridEditMode.Batch); editing.AllowUpdating(true); editing.StartEditAction(GridStartEditAction.DblClick); }) .Columns(column => { column.AddFor(m => m.FullName); column.AddFor(m => m.Prefix); column.AddFor(m => m.Title); column.AddFor(m => m.City); column.AddFor(m => m.HireDate); }) ) <div class="options"> <div class="caption">Options</div> <div class="option-container"> <div class="option check-box"> <div id="editOnKeyPress"></div> @(Html.DevExtreme().CheckBox() .ID("editOnKeyPress") .Text("Edit On Key Press") .Value(true) .OnValueChanged(@<text> function(data) { var dataGrid = $("#treeListContainer").dxTreeList("instance"); dataGrid.option("keyboardNavigation.editOnKeyPress", data.value); } </text>) ) </div> <div class="option"> <span class="option-caption">Enter Key Action</span> @{ var enterKeyActionDataSource = new[] { "startEdit", "moveFocus" }; } @(Html.DevExtreme().SelectBox() .ID("enterKeyAction") .DataSource(enterKeyActionDataSource) .InputAttr("aria-label", "Key Action") .Value(enterKeyActionDataSource[1]) .OnValueChanged(@<text> function(data) { var dataGrid = $("#treeListContainer").dxTreeList("instance"); dataGrid.option("keyboardNavigation.enterKeyAction", data.value); } </text>) ) <div class="select" id="enterKeyAction"></div> </div> <div class="option"> <span class="option-caption">Enter Key Direction</span> @{ var enterKeyDirectionDataSource = new[] { "none", "column", "row" }; } @(Html.DevExtreme().SelectBox() .ID("enterKeyDirection") .InputAttr("aria-label", "Key Direction") .DataSource(enterKeyDirectionDataSource) .Value(enterKeyDirectionDataSource[1]) .OnValueChanged(@<text> function(data) { var dataGrid = $("#treeListContainer").dxTreeList("instance"); dataGrid.option("keyboardNavigation.enterKeyDirection", data.value); } </text>) ) <div class="select" id="enterKeyDirection"></div> </div> </div> </div> </div>
using Microsoft.AspNetCore.Mvc; using DevExtreme.NETCore.Demos.Models.SampleData; namespace DevExtreme.NETCore.Demos.Controllers { public class TreeListController : Controller { public ActionResult CustomizeKeyboardNavigation() { return View(); } } }
using DevExtreme.AspNet.Data; using DevExtreme.AspNet.Mvc; using DevExtreme.NETCore.Demos.Models.TreeList; using Newtonsoft.Json; using System; using Microsoft.AspNetCore.Mvc; using System.Linq; using Microsoft.AspNetCore.Http; using Microsoft.Extensions.Caching.Memory; namespace DevExtreme.NETCore.Demos.Controllers.ApiControllers { [Route("api/[controller]")] public class TreeListEmployeesController : Controller { InMemoryEmployeesDataContext db; public TreeListEmployeesController(IHttpContextAccessor httpContextAccessor, IMemoryCache memoryCache) { db = new InMemoryEmployeesDataContext(httpContextAccessor, memoryCache); } [HttpGet] public object Get(DataSourceLoadOptions loadOptions) { return DataSourceLoader.Load(db.Employees, loadOptions); } [HttpPost] public IActionResult Post(string values) { var newEmployee = new Employee(); JsonConvert.PopulateObject(values, newEmployee); if(!TryValidateModel(newEmployee)) return BadRequest(ModelState.GetFullErrorMessage()); db.Employees.Add(newEmployee); db.SaveChanges(); return Ok(); } [HttpPut] public IActionResult Put(int key, string values) { var employee = db.Employees.First(e => e.ID == key); JsonConvert.PopulateObject(values, employee); if(!TryValidateModel(employee)) return BadRequest(ModelState.GetFullErrorMessage()); db.SaveChanges(); return Ok(); } [HttpDelete] public void Delete(int key) { var employee = db.Employees.First(e => e.ID == key); db.Employees.Remove(employee); db.SaveChanges(); } } }
using System; using System.ComponentModel.DataAnnotations; namespace DevExtreme.NETCore.Demos.Models.TreeList { public class Employee { public int ID { get; set; } [Required] [Display(Name = "Head")] public int HeadID { get; set; } [Required] public string FullName { get; set; } [Required] [Display(Name = "Title")] public string Prefix { get; set; } [Required] [Display(Name = "Position")] public string Title { get; set; } [Required] public string City { get; set; } public string State { get; set; } public string Email { get; set; } public string Skype { get; set; } public string MobilePhone { get; set; } public DateTime BirthDate { get; set; } [Required] public DateTime HireDate { get; set; } } }
using Microsoft.AspNetCore.Http; using Microsoft.Extensions.Caching.Memory; using System; using System.Collections.Generic; namespace DevExtreme.NETCore.Demos.Models.TreeList { public class InMemoryEmployeesDataContext : InMemoryDataContext<Employee> { public InMemoryEmployeesDataContext(IHttpContextAccessor contextAccessor, IMemoryCache memoryCache) : base(contextAccessor, memoryCache) { } public ICollection<Employee> Employees => ItemsInternal; protected override IEnumerable<Employee> Source => SampleData.SampleData.TreeListEmployees; protected override int GetKey(Employee item) => item.ID; protected override void SetKey(Employee item, int key) => item.ID = key; } }
using DevExtreme.NETCore.Demos.Models.TreeList; using System; using System.Collections.Generic; using System.Linq; namespace DevExtreme.NETCore.Demos.Models.SampleData { public partial class SampleData { public static readonly IEnumerable<Employee> TreeListEmployees = new[] { new Employee { ID = 1, HeadID = 0, FullName = "John Heart", Prefix = "Mr.", Title ="CEO", City = "Los Angeles", State = "California", Email = "jheart@dx-email.com", Skype = "jheart_DX_skype", MobilePhone = "(213) 555-9392", BirthDate = DateTime.Parse("1964/03/16"), HireDate = DateTime.Parse("1995/01/15") }, new Employee { ID = 2, HeadID = 1, FullName = "Samantha Bright", Prefix = "Dr.", Title ="COO", City = "Los Angeles", State = "California", Email = "samanthab@dx-email.com", Skype = "samanthab_DX_skype", MobilePhone = "(213) 555-2858", BirthDate = DateTime.Parse("1966/05/02"), HireDate = DateTime.Parse("2004/05/24") }, new Employee { ID = 3, HeadID = 1, FullName = "Arthur Miller", Prefix = "Mr.", Title ="CTO", City = "Denver", State = "Colorado", Email = "arthurm@dx-email.com", Skype = "arthurm_DX_skype", MobilePhone = "(310) 555-8583", BirthDate = DateTime.Parse("1972/07/11"), HireDate = DateTime.Parse("2007/12/18") }, new Employee { ID = 4, HeadID = 1, FullName = "Robert Reagan", Prefix = "Mr.", Title ="CMO", City = "Bentonville", State = "Arkansas", Email = "robertr@dx-email.com", Skype = "robertr_DX_skype", MobilePhone = "(818) 555-2387", BirthDate = DateTime.Parse("1974/09/07"), HireDate = DateTime.Parse("2002/11/08") }, new Employee { ID = 5, HeadID = 1, FullName = "Greta Sims", Prefix = "Ms.", Title ="HR Manager", City = "Atlanta", State = "Georgia", Email = "gretas@dx-email.com", Skype = "gretas_DX_skype", MobilePhone = "(818) 555-6546", BirthDate = DateTime.Parse("1977/11/22"), HireDate = DateTime.Parse("1998/04/23") }, new Employee { ID = 6, HeadID = 3, FullName = "Brett Wade", Prefix = "Mr.", Title ="IT Manager", City = "Reno", State = "Nevada", Email = "brettw@dx-email.com", Skype = "brettw_DX_skype", MobilePhone = "(626) 555-0358", BirthDate = DateTime.Parse("1968/12/01"), HireDate = DateTime.Parse("2009/03/06") }, new Employee { ID = 7, HeadID = 5, FullName = "Sandra Johnson", Prefix = "Mrs.", Title ="Controller", City = "Beaver", State = "Utah", Email = "sandraj@dx-email.com", Skype = "sandraj_DX_skype", MobilePhone = "(562) 555-2082", BirthDate = DateTime.Parse("1974/11/15"), HireDate = DateTime.Parse("2005/05/11") }, new Employee { ID = 8, HeadID = 4, FullName = "Ed Holmes", Prefix = "Dr.", Title ="Sales Manager", City = "Malibu", State = "California", Email = "edwardh@dx-email.com", Skype = "edwardh_DX_skype", MobilePhone = "(310) 555-1288", BirthDate = DateTime.Parse("1973/07/14"), HireDate = DateTime.Parse("2005/06/19") }, new Employee { ID = 9, HeadID = 3, FullName = "Barb Banks", Prefix = "Mrs.", Title ="Support Manager", City = "Phoenix", State = "Arizona", Email = "barbarab@dx-email.com", Skype = "barbarab_DX_skype", MobilePhone = "(310) 555-3355", BirthDate = DateTime.Parse("1979/04/14"), HireDate = DateTime.Parse("2002/08/07") }, new Employee { ID = 10, HeadID = 2, FullName = "Kevin Carter", Prefix = "Mr.", Title ="Shipping Manager", City = "San Diego", State = "California", Email = "kevinc@dx-email.com", Skype = "kevinc_DX_skype", MobilePhone = "(213) 555-2840", BirthDate = DateTime.Parse("1978/01/09"), HireDate = DateTime.Parse("2009/08/11") }, new Employee { ID = 11, HeadID = 5, FullName = "Cindy Stanwick", Prefix = "Ms.", Title ="HR Assistant", City = "Little Rock", State = "Arkansas", Email = "cindys@dx-email.com", Skype = "cindys_DX_skype", MobilePhone = "(818) 555-6655", BirthDate = DateTime.Parse("1985/06/05"), HireDate = DateTime.Parse("2008/03/24") }, new Employee { ID = 12, HeadID = 8, FullName = "Sammy Hill", Prefix = "Mr.", Title ="Sales Assistant", City = "Pasadena", State = "California", Email = "sammyh@dx-email.com", Skype = "sammyh_DX_skype", MobilePhone = "(626) 555-7292", BirthDate = DateTime.Parse("1984/02/17"), HireDate = DateTime.Parse("2012/02/01") }, new Employee { ID = 13, HeadID = 10, FullName = "Davey Jones", Prefix = "Mr.", Title ="Shipping Assistant", City = "Pasadena", State = "California", Email = "davidj@dx-email.com", Skype = "davidj_DX_skype", MobilePhone = "(626) 555-0281", BirthDate = DateTime.Parse("1983/03/06"), HireDate = DateTime.Parse("2011/04/24") }, new Employee { ID = 14, HeadID = 10, FullName = "Victor Norris", Prefix = "Mr.", Title ="Shipping Assistant", City = "Little Rock", State = "Arkansas", Email = "victorn@dx-email.com", Skype = "victorn_DX_skype", MobilePhone = "(213) 555-9278", BirthDate = DateTime.Parse("1986/07/23"), HireDate = DateTime.Parse("2012/07/23") }, new Employee { ID = 15, HeadID = 10, FullName = "Mary Stern", Prefix = "Ms.", Title ="Shipping Assistant", City = "Beaver", State = "Utah", Email = "marys@dx-email.com", Skype = "marys_DX_skype", MobilePhone = "(818) 555-7857", BirthDate = DateTime.Parse("1982/04/08"), HireDate = DateTime.Parse("2012/08/12") }, new Employee { ID = 16, HeadID = 10, FullName = "Robin Cosworth", Prefix = "Mrs.", Title ="Shipping Assistant", City = "Los Angeles", State = "California", Email = "robinc@dx-email.com", Skype = "robinc_DX_skype", MobilePhone = "(818) 555-0942", BirthDate = DateTime.Parse("1981/06/12"), HireDate = DateTime.Parse("2012/09/01") }, new Employee { ID = 17, HeadID = 9, FullName = "Kelly Rodriguez", Prefix = "Ms.", Title ="Support Assistant", City = "Boise", State = "Idaho", Email = "kellyr@dx-email.com", Skype = "kellyr_DX_skype", MobilePhone = "(818) 555-9248", BirthDate = DateTime.Parse("1988/05/11"), HireDate = DateTime.Parse("2012/10/13") }, new Employee { ID = 18, HeadID = 9, FullName = "James Anderson", Prefix = "Mr.", Title ="Support Assistant", City = "Atlanta", State = "Georgia", Email = "jamesa@dx-email.com", Skype = "jamesa_DX_skype", MobilePhone = "(323) 555-4702", BirthDate = DateTime.Parse("1987/01/29"), HireDate = DateTime.Parse("2012/10/18") }, new Employee { ID = 19, HeadID = 9, FullName = "Antony Remmen", Prefix = "Mr.", Title ="Support Assistant", City = "Boise", State = "Idaho", Email = "anthonyr@dx-email.com", Skype = "anthonyr_DX_skype", MobilePhone = "(310) 555-6625", BirthDate = DateTime.Parse("1986/02/19"), HireDate = DateTime.Parse("2013/01/19") }, new Employee { ID = 20, HeadID = 8, FullName = "Olivia Peyton", Prefix = "Mrs.", Title ="Sales Assistant", City = "Atlanta", State = "Georgia", Email = "oliviap@dx-email.com", Skype = "oliviap_DX_skype", MobilePhone = "(310) 555-2728", BirthDate = DateTime.Parse("1981/06/03"), HireDate = DateTime.Parse("2012/05/14") }, new Employee { ID = 21, HeadID = 6, FullName = "Taylor Riley", Prefix = "Mr.", Title ="Network Admin", City = "San Jose", State = "California", Email = "taylorr@dx-email.com", Skype = "taylorr_DX_skype", MobilePhone = "(310) 555-7276", BirthDate = DateTime.Parse("1982/08/14"), HireDate = DateTime.Parse("2012/04/14") }, new Employee { ID = 22, HeadID = 6, FullName = "Amelia Harper", Prefix = "Mrs.", Title ="Network Admin", City = "Los Angeles", State = "California", Email = "ameliah@dx-email.com", Skype = "ameliah_DX_skype", MobilePhone = "(213) 555-4276", BirthDate = DateTime.Parse("1983/11/19"), HireDate = DateTime.Parse("2011/02/10") }, new Employee { ID = 23, HeadID = 6, FullName = "Wally Hobbs", Prefix = "Mr.", Title ="Programmer", City = "Chatsworth", State = "California", Email = "wallyh@dx-email.com", Skype = "wallyh_DX_skype", MobilePhone = "(818) 555-8872", BirthDate = DateTime.Parse("1984/12/24"), HireDate = DateTime.Parse("2011/02/17") }, new Employee { ID = 24, HeadID = 6, FullName = "Brad Jameson", Prefix = "Mr.", Title ="Programmer", City = "San Fernando", State = "California", Email = "bradleyj@dx-email.com", Skype = "bradleyj_DX_skype", MobilePhone = "(818) 555-4646", BirthDate = DateTime.Parse("1988/10/12"), HireDate = DateTime.Parse("2011/03/02") }, new Employee { ID = 25, HeadID = 6, FullName = "Karen Goodson", Prefix = "Miss", Title ="Programmer", City = "South Pasadena", State = "California", Email = "kareng@dx-email.com", Skype = "kareng_DX_skype", MobilePhone = "(626) 555-0908", BirthDate = DateTime.Parse("1987/04/26"), HireDate = DateTime.Parse("2011/03/14") }, new Employee { ID = 26, HeadID = 5, FullName = "Marcus Orbison", Prefix = "Mr.", Title ="Travel Coordinator", City = "Los Angeles", State = "California", Email = "marcuso@dx-email.com", Skype = "marcuso_DX_skype", MobilePhone = "(213) 555-7098", BirthDate = DateTime.Parse("1982/03/02"), HireDate = DateTime.Parse("2005/05/19") }, new Employee { ID = 27, HeadID = 5, FullName = "Sandy Bright", Prefix = "Ms.", Title ="Benefits Coordinator", City = "Denver", State = "Colorado", Email = "sandrab@dx-email.com", Skype = "sandrab_DX_skype", MobilePhone = "(818) 555-0524", BirthDate = DateTime.Parse("1983/09/11"), HireDate = DateTime.Parse("2005/06/04") }, new Employee { ID = 28, HeadID = 6, FullName = "Morgan Kennedy", Prefix = "Mrs.", Title ="Graphic Designer", City = "San Fernando Valley", State = "California", Email = "morgank@dx-email.com", Skype = "morgank_DX_skype", MobilePhone = "(818) 555-8238", BirthDate = DateTime.Parse("1984/07/17"), HireDate = DateTime.Parse("2012/01/11") }, new Employee { ID = 29, HeadID = 28, FullName = "Violet Bailey", Prefix = "Ms.", Title ="Jr Graphic Designer", City = "La Canada", State = "California", Email = "violetb@dx-email.com", Skype = "violetb_DX_skype", MobilePhone = "(818) 555-2478", BirthDate = DateTime.Parse("1985/06/10"), HireDate = DateTime.Parse("2012/01/19") }, new Employee { ID = 30, HeadID = 5, FullName = "Ken Samuelson", Prefix = "Dr.", Title ="Ombudsman", City = "St. Louis", State = "Missouri", Email = "kents@dx-email.com", Skype = "kents_DX_skype", MobilePhone = "(562) 555-9282", BirthDate = DateTime.Parse("1972/09/11"), HireDate = DateTime.Parse("2009/04/22") } }; } }
#employees { max-height: 640px; } .options { margin-top: 20px; padding: 20px; background-color: rgba(191, 191, 191, 0.15); position: relative; } .caption { font-size: 18px; font-weight: 500; } .option-container { display: flex; margin: 0 auto; justify-content: space-between; } .option { margin-top: 10px; display: flex; align-items: center; } .option-caption { white-space: nowrap; margin: 0 8px; } .option.check-box { width: 150px; } .option > .dx-selectbox { width: 155px; }