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Backend API
@(Html.DevExtreme().TreeList<DevExtreme.NETCore.Demos.Models.TreeList.Employee>()
.ID("employees")
.DataSource(ds => ds.Mvc().Controller("TreeListEmployees").LoadAction("Get").Key("ID"))
.KeyExpr("ID")
.ParentIdExpr("HeadID")
.ShowRowLines(true)
.ShowBorders(true)
.Selection(s => s
.Mode(SelectionMode.Multiple)
.Recursive(false)
)
.Columns(columns => {
columns.AddFor(m => m.FullName);
columns.AddFor(m => m.Title);
columns.AddFor(m => m.City);
columns.AddFor(m => m.State);
columns.AddFor(m => m.HireDate)
.Width(120);
})
.ColumnAutoWidth(true)
.ExpandedRowKeys(new[] { 1, 2, 10 })
.OnSelectionChanged("onSelectionChanged")
)
<div class="options">
<div class="caption">Options</div>
<div class="option">
<span>Selection Mode</span>
@(Html.DevExtreme().SelectBox()
.Value("all")
.InputAttr("aria-label", "Selection Mode")
.DataSource(new[] { "all", "excludeRecursive", "leavesOnly" })
.OnValueChanged(@<text>
function(e) {
var treeList = $("#employees").dxTreeList("instance");
treeList.clearSelection();
selectionMode = e.value;
}
</text>
)
)
</div>
<div class="option">
@(Html.DevExtreme().CheckBox()
.Value(false)
.Text("Recursive Selection")
.OnValueChanged(@<text>
function(e) {
var treeList = $("#employees").dxTreeList("instance");
treeList.clearSelection();
treeList.option("selection.recursive", e.value);
}
</text>
)
)
</div>
<div class="selected-data">
<span class="caption">Selected Records:</span>
<span id="selected-items-container">Nobody has been selected</span>
</div>
</div>
<script>
var selectionMode = "all";
function getEmployeeNames(employees) {
if (employees.length > 0) {
return employees.map(employee => employee.FullName).join(", ");
} else {
return "Nobody has been selected";
}
}
function onSelectionChanged(e) {
var selectedData = e.component.getSelectedRowsData("all");
$("#selected-items-container").text(getEmployeeNames(selectedData));
}
</script>
using Microsoft.AspNetCore.Mvc;
using DevExtreme.NETCore.Demos.Models.SampleData;
namespace DevExtreme.NETCore.Demos.Controllers {
public class TreeListController : Controller {
public ActionResult MultipleRowSelection() {
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 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: 440px;
}
.options {
padding: 20px;
margin-top: 20px;
background-color: rgba(191, 191, 191, 0.15);
}
.caption {
font-size: 18px;
font-weight: 500;
}
.option {
margin-top: 10px;
}
.selected-data {
margin-top: 20px;
}
.option > span {
width: 120px;
display: inline-block;
}
.option > .dx-widget {
display: inline-block;
vertical-align: middle;
width: 100%;
max-width: 350px;
}
TreeList includes an API to select multiple rows. For details, refer to the following article: Selection API.