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Backend API
<div id="descContainer">Sort and filter data, reorder and resize columns, select and expand rows. Once you are done, <a onclick="window.location.reload()">refresh</a> the web page to see that the grid’s state is automatically persisted to continue working from where you stopped or you can <a onclick="onStateResetClick()">reset</a> the grid to its initial state.</div>
@(Html.DevExtreme().TreeList<DevExtreme.MVC.Demos.Models.TreeList.Employee>()
.ID("employees")
.DataSource(ds => ds.WebApi().Controller("TreeListEmployees").Key("ID"))
.KeyExpr("ID")
.ParentIdExpr("HeadID")
.AllowColumnReordering(true)
.AllowColumnResizing(true)
.ShowBorders(true)
.FilterRow(r => r.Visible(true))
.StateStoring(s => s
.Enabled(true)
.Type(StateStoringType.LocalStorage)
.StorageKey("treeListStorage")
)
.Selection(s => s
.Mode(SelectionMode.Multiple)
.Recursive(true)
)
.ExpandedRowKeys(new[] { 1, 2, 10 })
.Columns(columns => {
columns.AddFor(m => m.FullName);
columns.AddFor(m => m.Title);
columns.AddFor(m => m.City);
columns.AddFor(m => m.HireDate)
.Width(160);
})
)
<script>
function onStateResetClick() {
const dataGrid = $("#employees").dxTreeList("instance");
dataGrid.state(null);
}
</script>
using System.Web.Mvc;
using DevExtreme.MVC.Demos.Models.SampleData;
namespace DevExtreme.MVC.Demos.Controllers {
public class TreeListController : Controller {
public ActionResult StatePersistence() {
return View();
}
}
}
using DevExtreme.AspNet.Data;
using DevExtreme.AspNet.Mvc;
using DevExtreme.MVC.Demos.Models.TreeList;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Formatting;
using System.Web.Http;
namespace DevExtreme.MVC.Demos.Controllers.ApiControllers {
public class TreeListEmployeesController : ApiController {
InMemoryEmployeesDataContext db = new InMemoryEmployeesDataContext();
[HttpGet]
public HttpResponseMessage Get(DataSourceLoadOptions loadOptions) {
return Request.CreateResponse(DataSourceLoader.Load(db.Employees, loadOptions));
}
[HttpPost]
public HttpResponseMessage Post(FormDataCollection form) {
var values = form.Get("values");
var newEmployee = new Employee();
JsonConvert.PopulateObject(values, newEmployee);
Validate(newEmployee);
if(!ModelState.IsValid)
return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState.GetFullErrorMessage());
db.Employees.Add(newEmployee);
db.SaveChanges();
return Request.CreateResponse(HttpStatusCode.Created, newEmployee);
}
[HttpPut]
public HttpResponseMessage Put(FormDataCollection form) {
var key = Convert.ToInt32(form.Get("key"));
var values = form.Get("values");
var employee = db.Employees.First(e => e.ID == key);
JsonConvert.PopulateObject(values, employee);
Validate(employee);
if(!ModelState.IsValid)
return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState.GetFullErrorMessage());
db.SaveChanges();
return Request.CreateResponse(HttpStatusCode.OK, employee);
}
[HttpDelete]
public void Delete(FormDataCollection form) {
var key = Convert.ToInt32(form.Get("key"));
var employee = db.Employees.First(e => e.ID == key);
db.Employees.Remove(employee);
db.SaveChanges();
}
}
}
using System;
using System.ComponentModel.DataAnnotations;
namespace DevExtreme.MVC.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.MVC.Demos.Models.TreeList;
using System;
using System.Collections.Generic;
namespace DevExtreme.MVC.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 {
height: 440px;
margin-top: 30px;
}
#descContainer a {
color: #f05b41;
text-decoration: underline;
cursor: pointer;
}
#descContainer a:hover {
text-decoration: none;
}
To enable state persistence, set stateStoring.enabled to true and specify the storageKey and type properties. Depending on the type, the state can be saved to a localStorage or sessionStorage. With localStorage, the state persists across browser sessions; with sessionStorage, it is reset after the current session. This demo uses localStorage.
Alternatively, you can implement the customSave and customLoad functions to save and load the state according to custom logic. In this case, set the type property to "custom".