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Backend API
<div id="tree-list-demo">
@(Html.DevExtreme().TreeList<DevExtreme.NETCore.Demos.Models.TreeList.Employee>()
.ID("employees")
.DataSource(ds => ds.Mvc()
.Controller("TreeListEmployees")
.LoadAction("Get")
.UpdateAction("Put")
.InsertAction("Post")
.DeleteAction("Delete")
.Key("ID")
)
.KeyExpr("ID")
.ParentIdExpr("HeadID")
.ShowRowLines(true)
.ShowBorders(true)
.Editing(editing => editing
.Mode(GridEditMode.Form)
.AllowUpdating(true)
.AllowDeleting(new JS("allowDeleting"))
.AllowAdding(true)
)
.Columns(columns => {
columns.AddFor(m => m.FullName);
columns.AddFor(m => m.Prefix);
columns.AddFor(m => m.HeadID)
.Width(150)
.Visible(false)
.Lookup(lookup => lookup
.DataSource(ds => ds.Mvc().Controller("TreeListEmployees").LoadAction("Get").Key("ID"))
.DataSourceOptions(dso => dso.Sort(sort => sort.AddSorting("FullName")))
.ValueExpr("ID")
.DisplayExpr("FullName")
);
columns.AddFor(m => m.Title);
columns.AddFor(m => m.City)
.Width(150);
columns.AddFor(m => m.HireDate)
.Width(120);
columns.Add()
.Type(TreeListCommandColumnType.Buttons)
.Buttons(b => {
b.Add().Name(TreeListColumnButtonName.Edit);
b.Add().Name(TreeListColumnButtonName.Delete);
});
})
.ColumnAutoWidth(true)
.OnEditorPreparing("treeList_onEditorPreparing")
.OnInitNewRow("treeList_onInitNewRow")
.ExpandedRowKeys(new[] { 1, 2, 3, 4, 5 })
)
</div>
<script>
function treeList_onEditorPreparing(e) {
if(e.dataField === "HeadID" && e.row.data.ID === 1) {
e.editorOptions.disabled = true;
e.editorOptions.value = null;
}
}
function treeList_onInitNewRow(e) {
e.data.HeadID = 1;
}
function allowDeleting(e) {
return e.row.data.ID !== 1;
}
</script>
using Microsoft.AspNetCore.Mvc;
using DevExtreme.NETCore.Demos.Models.SampleData;
namespace DevExtreme.NETCore.Demos.Controllers {
public class TreeListController : Controller {
public ActionResult FormEditing() {
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;
}
A column's default editor is defined automatically based on this column's dataType. To customize this editor or replace it with another editor, use the column's formItem object. For information on settings that you can define in the formItem object, refer to the SimpleItem help topic.
You can also set up the edit Form from scratch. The component's configuration section lists available settings. Specify these settings in the editing.form object. Refer to this object's description for information about form edit mode limitations.
This demo also illustrates the following event handlers:
-
onInitNewRow
Populates form editors of a new row with default values. In this demo, onInitNewRow sets "John Heart" as the initialHeadfor new rows. -
onEditorPreparing
Customizes form editors. In this demo, this handler forbids users to edit theHeadvalue of John Heart.
Refer to the following help topic to see the full list of the events that edit operations raise: Editing Events.