AJAX Master Detail Combo

Setp 1: Placing master and detail comboes in page , master combo should be filled in server so we use DropDownList extension method.

<%= Html.DropDownList("master", Model.MasterItems, "Please select master first.")%>
<select id="detail" name="detail"></select>
Setp2: Referencing js file.

type="text/javascript" src="/Scripts/Mehr.js"></script>
Step3: JavaScript Initialization.

pmd1 = new MasterDetail("master", "detail", "/detail/GetList/", "Please select master first.");

Parameter include

master combo id
detial combo id
detail get url (controller method with master id paramater, somthing like public JsonResult GetAll(int id) )
prompt message.