Feel free to share demo-related thoughts here.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
Thank you for the feedback!
If you have technical questions, please create a support ticket in the DevExpress Support Center.
Backend API
@using DevExtreme.NETCore.Demos.Models.TreeList
@model IEnumerable<Employee>
@(Html.DevExtreme().TreeList<Employee>()
.ID("employees")
.DataSource(Model)
.KeyExpr("ID")
.ParentIdExpr("HeadID")
.AllowColumnResizing(true)
.ColumnMinWidth(50)
.ColumnAutoWidth(true)
.Columns(column => {
column.AddFor(m => m.Title);
column.AddFor(m => m.FullName);
column.AddFor(m => m.City);
column.AddFor(m => m.State);
column.AddFor(m => m.HireDate);
})
.ShowRowLines(true)
.ShowBorders(true)
.ExpandedRowKeys(new[] { 1, 3, 6 })
)
<div class="options">
<div class="caption">Options</div>
<div class="option">
<span>Column resizing mode:</span>
@(Html.DevExtreme().SelectBox()
.ID("select-resizing")
.InputAttr("aria-label", "Column Resizing Mode")
.DataSource(new[] { "nextColumn", "widget" })
.Value("nextColumn")
.Width(250)
.OnValueChanged("selectBox_valueChanged")
)
</div>
</div>
<script>
function selectBox_valueChanged(data) {
var treeList = $("#employees").dxTreeList("instance");
treeList.option("columnResizingMode", data.value);
}
</script>
using Microsoft.AspNetCore.Mvc;
using DevExtreme.NETCore.Demos.Models.SampleData;
namespace DevExtreme.NETCore.Demos.Controllers {
public class TreeListController : Controller {
public ActionResult Resizing() {
return View(SampleData.TreeListEmployees);
}
}
}
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: 307px;
}
.options {
padding: 20px;
margin-top: 20px;
background-color: rgba(191, 191, 191, 0.15);
position: absolute;
bottom: 0px;
width: 100%;
}
.caption {
font-weight: 500;
font-size: 18px;
}
.option {
margin-top: 10px;
}
.option > span {
position: relative;
top: 2px;
margin-right: 10px;
}
.option > .dx-widget {
display: inline-block;
vertical-align: middle;
}
Specify Custom Column Widths
You can set custom widths for all or individual columns. Individual settings override common settings. Use the following properties to specify the widths:
-
columnWidth / columns[].width
Specify a width for all or individual columns. -
columnMinWidth / columns[].minWidth
Specify a minimum width for all or individual columns.
Auto-Adjust Column Widths to Content
In this demo, columns adjust their widths to the content. To enable this feature, set the columnAutoWidth property to true.
Allow Users to Resize Columns
Users can resize columns if the allowColumnResizing property is enabled. When a user resizes a column, the TreeList's behavior depends on the columnResizingMode property value:
-
"nextColumn"
The TreeList resizes the adjacent column; the total component width does not change. -
"widget"
The total component width increases or decreases; all other columns maintain their widths.
Use the drop-down list below the TreeList to try both values.
If you do not want users to resize a specific column, disable its allowResizing property.