Kendo Read Action - getting the control Id - asp.net-mvc

Question

I have a partial view using a Kendo DropDownListFor and within the Datasource Read action I am passing a function name to get additional parameters eg.
#(Html.Kendo().DropDownListFor(m => m.AssignedUserId)
.OptionLabel("Assign to ...")
.DataTextField("FullName")
.DataValueField("UserId")
.Filter(FilterType.StartsWith)
.AutoBind(true)
.DataSource(source => {
source.Read(read => { **read.Action("GetStaffList", "ManageUser").Data("filterAssigned");** })
.ServerFiltering(true);
})
)
function filterAssigned(e) {
// Selector needs to be prefixed "Create_" or "Update_" depending on view/HtmlFieldPrefix.
var ctl = $("#AssignedUserId").data("kendoDropDownList");
return {
staffFilter: (ctl.filterInput.val() || 'empty'),
selectedId: (ctl.value() || 0)
};
}
Within the "FilterAssigned" function I want to get the Id of the control rather than hardcoding $("#AssignedUserId").data("kendoDropDownList"). This is because when creating the View, I am setting the ViewData.TemplateInfo.HtmlFieldPrefix = "Create" so the actual control id is rendered as "Create_AssignedUserId" and I want to use the same function for Create, Update etc.
I have tried the usual options:
this.id
this.attr('id')
this.element.attr('id')
e.sender
Telerik state that the 'this' attribute is not obtainable during a read but I have seen no other solution other than the selector method. Basically I am trying to do this:
function filterAssigned() {
var ctl = **this.id**;
return {
staffFilter: (ctl.filterInput.val() || 'empty'),
selectedId: (ctl.value() || 0)
};
}

Answer 1

I found the best way to solve this was to use the razor helper #Html.IdFor. The control id this returns includes the HtmlFieldPrefix. The function will now look like ...
function filterAssigned() {
var ctl = $("##Html.IdFor(m => m.AssignedUserId)").data("kendoDropDownList");
return {
staffFilter: (ctl.filterInput.val() || 'empty'),
selectedId: (ctl.value() || 0)
};
}