MVC 利用Ajax联动

javascript代码：ajax的

<mce:script type="text/javascript"><!-- $(document).ready(function() { $("#City").change(function() { var selec = $("#City").val(); $("#Region").get(0).options.length = 0; $.getJSON("RegionByCity?pid=" + selec, { 'City': selec }, function(data) { for (var i = 0; i < data.length; i++) { $("#Region").append("<option value='" + data[i].Id + "'>" + data[i].Name + "</option>"); } }); }); }); // --></mce:script> 

页面代码：

<td style="text-align: right; width: 100px;"> 城市/区域： </td> <td style="width: 170px; text-align: left"> <%= Html.DropDownListFor(m => m.City, new SelectList(Test.TestPersistence.TestDao.GetCodeDict(11), "Id", "Name"))%> <%= Html.DropDownListFor(m => m.Region, new SelectList(Test.TestPersistence.TestDao.GetCodeDict(1001), "Id", "Name"))%> </td>

control的代码：

public ActionResult RegionByCity() { int pid = Convert.ToInt32(Request.QueryString["pid"]); CodeDao codeDao = new CodeDao(); var codeList = codeDao.GetCodes(pid); if (Request.IsAjaxRequest()) { return Json(codeList, JsonRequestBehavior.AllowGet); } else { return View(""); } } 

逻辑层： 

public IList<Code> GetCodes(int pid) { using (ISession session = sessions.OpenSession()) { IQuery query = session.CreateQuery("from Code c where c.PId =:pid order by Id "); query = query.SetInt32("pid", pid); return query.List<Code>(); } }