Thank you for your answer Denis Georgiev, it's ok. But how to auto selected values when I have it.

And if I have country combobox how to cascading combobox state in asp mvc.

Hello Quang,

Refer to the sample attached.

Thank you for your answer, but how can I set selected item of combobox when load data from database

Hello Quang,

You can use .SelectedIndexes(int[]), where the method takes as argument array of integers.

Tk Denis Georgiev I can load all data for combobox but I have problem when set select item for combobox.

I can't used method .SelectedIndexes(int[]) it have error Error    9    'Infragistics.Web.Mvc.ComboWrapper' does not contain a definition for 'SelectedIndexes' and no extension method 'SelectedIndexes' accepting a first argument of type 'Infragistics.Web.Mvc.ComboWrapper' could be found.

And how to use Html.Infragistics().ComboFor() at mvc view, I have some code below

class PersonModels

{

string Fullname {get;set;}
string CityID {get;set;}

...

}

if string someone person CityID has values 2 how to set selected item when I load all combobox city with city name & values

I use Dapper with return detail of someone person like this

[repository]

 public List<PersonModels> Details(string id)
     {
          
          
            var p = new DynamicParameters();
            
            p.Add("PersonID", id);
            IList<PersonModels> person = SqlMapper.Query<PersonModels>(cn, "proc_TS_ThongTinTuyenSinhLoadByPrimaryKey", p, commandType: CommandType.StoredProcedure).ToList<PersonModels>();

            return person.ToList();

        }

how to set selected item for combobox city from Person CityID value

Hello Quang,

Thank you for your patience!

Please refer to the attached sample.

The sample demonstrates how to setup cascading combo using mvc with initial selected items.

Let me know if you need further assistance.

the combobox can't select by value if I I get json data like this

 public ActionResult get_all_khu_vuc()
        {


            string strSQL = "select rtrim(MaKhuVucUT) as MaKhuVucUT, (rtrim(MaKhuVucUT) + ' | ' + TenKhuVucUT) as TenKhuVucUT  from DM_TS_KhuVucUuTien order by MaKhuVucUT asc";
            var data = SqlMapper.Query(this.cn, strSQL).ToList();

            return this.Json(data, JsonRequestBehavior.AllowGet);
        }

it work If I use js file and declare

var data_khu_vuc = [
                      { "ma_khu_vuc": "01",  "ten_khu_vuc": "01 | Khu vực 1" },            
                      { "ma_khu_vuc": "02",   "ten_khu_vuc": "02 | Khu vực 2" },
                      { "ma_khu_vuc": "03",  "ten_khu_vuc" :"03 | Khu vực 3" }
                      
                ];        

It's ok, I can set selected items in view by javascript here is my code:

$('#combo').igCombo({ initialSelectedItems: [{ index: 0 }] });

but my problem is I can't figure out how to set selected combobox with value (not index) from code behind in controller and return it to view.

Can I use combobox like this : List items = new List() and have selected if compare = true on value

foreach (countryModels)

items.Add(new SelectListItem
        {
            Text = ct.countryID.ToString().Trim() + " | " + ct.countryname.Trim()
            ,Value = ct.countryID.ToString().Trim()
            ,Selected = (ct.countryID.ToString().Trim() == CountryId)
        });

[controller]

ViewBag.List_Country=items;

[view]

Call combobox with have selected value from controller

Tk again