jqgrid inline editing autocomplete dropdown - jqgrid

Question

Found answers in Oleg post but unable to solve in my case.
I have a jqGrid with inline editing. That works fine. One column 'SupervisorUserID' has a dropdown box with list of entries which retrieved from a database query already.
As the entries are too much, I want to have an input field which will autocomplete/search the dropdown list.
Please help me to achieve this. Thanks.
My code,
public JsonResult PersonnelManagementGrid(string sidx, string sord, int page, int rows)
{
objPersonnelManagementViewModel = new PersonnelManagementViewModel();
objPersonnelManagementViewModel.PersonnelManagementModelList = (List<PersonnelManagementModel>) Session["PersonnelList"];
var results = objPersonnelManagementViewModel.PersonnelManagementModelList.Select(x => new
{
x.UserID,
x.Name,
x.InActive,
x.SupervisorUserID,
});
int pageIndex = Convert.ToInt16(page) - 1;
int pageSize = rows;
int totalRecords = results.Count();
var totalPages = (int)Math.Ceiling((float)totalRecords / (float)rows);
if (sord.ToUpper() == "DESC")
{ results = results.OrderByDescending(e => e.Name); }
else { results = results.OrderBy(e => e.Name); }
results = results.Skip(pageIndex * pageSize).Take(pageSize);
var sbLocations = new System.Text.StringBuilder();
Dictionary<string, string> personnelList = new Dictionary<string, string>();
personnelList = objPersonnelManagementViewModel.PersonnelManagementModelList.ToDictionary(x => x.UserID, x => x.Name);
//personnelList.Add("1","one");
//personnelList.Add("2", "two");
//personnelList.Add("3", "three");
foreach (var sortedLocation in personnelList)
{
sbLocations.Append(sortedLocation.Key);
sbLocations.Append(':');
sbLocations.Append(sortedLocation.Value);
sbLocations.Append(';');
}
if (sbLocations.Length > 0)
sbLocations.Length -= 1; // remove last ';'
var jsonResults = new
{
colModelOptions = new
{
SupervisorUserID = new
{
formatter = "select",
edittype = "select",
editoptions = new
{
value = sbLocations.ToString()
}
}
},
total = totalPages,
page,
records = totalRecords,
rows= results,
};
return Json(jsonResults, JsonRequestBehavior.AllowGet);
}
Jquery:
$(function () {
$("#PersonnelManagementGrid").jqGrid({
url: '/PersonnelManagement/PersonnelManagementGrid',
datatype: "json",
contentType: "application/json; charset-utf-8",
mtype: 'Get',
colNames: ['UserID', 'Name', 'Role', 'Active?', 'Supervisor', 'Change Active', 'Try Delete'],
colModel: [
{ key: true, name: 'UserID', index: 'UserID', hidden: true },
{
name: 'Name', index: 'Name', editable: false, width: "460", sortable: true,
},
{
name: 'Role', index: 'Role', editable: false, width: "200", sortable: true,
},
{
name: 'InActive', index: 'InActive', editable: false, width: "200", sortable: true,
},
{
name: 'SupervisorUserID', index: 'SupervisorUserID', editable: true, formatter: 'select', width: "200", sortable: true,
edittype: 'select', width: "200", align: "center",
},
{
name: "Change Active", sortable: false, width: "200", align: "center",
formatter: function (cellvalue, options, rowObj) {
var cBtn = '<input type="button" class="button" value="Change" onclick= "changeActive(' + "'" + rowObj.id + "','" + "values" + "','" + "values" + '\')"/>'
return cBtn;
}
},
{
name: "Try Delete", sortable: false, width: "200", align: "center",
formatter: function (cellvalue, options, rowObj) {
var cBtn = '<input type="button" value="Delete" onclick= "tryDelete(' + "'" + rowObj.id + "','" + "values" + "','" + "values" + '\')"/>'
return cBtn;
}
}
],
beforeProcessing: function (response) {
var $self = $(this),
options = response.colModelOptions, p;
if (options != null) {
for (p in options) {
if (options.hasOwnProperty(p)) {
$self.jqGrid("setColProp", p, options[p]);
}
}
}
},
pager: jQuery('#pager'),
rowNum: 15,
rowList: [5, 10, 15],
height: '100%',
width: '1328',
viewrecords: true,
caption: 'Personnel Management',
//loadonce: true,
emptyrecords: 'No records to display',
scrollerbar: false,
jsonReader: {
root: "rows",
page: "pagenumbers",
total: "totalnumbers",
records: "records",
repeatitems: false,
id: "0"
},
hidegrid: false,
multiselect: false,
onSelectRow: function (id) {
rowSelect(id);
},
}).navGrid('#pager', { edit: false, add: false, del: false, search: false, cancel: false, reload: false, refresh: false });
});