在发布到控制器后保留下拉列表选择的值

Question

我在我的视图中有dropdownlist，并使用控制器的值加载此下拉列表。在更改事件时，我需要将数据传递给控制器​​，之后下载列表加载新鲜。但是我希望在发布到控制器后保留选定的值。我jQuery是以下几点：

$.ajax({ 
     url: "/TimesheetModels/GetUsersForTimesheet", 
     type: "Get", 
     success: function (data) { 
      for (var i = 0; i < data.length; i++) {     
       opt = new Option(data[i].First_Name, data[i].EmpId); 
       $('#ddlUsers').append(opt); //Load drodown list while page load 
      } 
     } 
    }); 

$('#ddlUsers').change(function() { 
     alert($(this).val()); 
     var empId = $(this).val(); 
     startDate = $('#calendar').fullCalendar('getDate').startOf('week'); 
     window.location.href = "/TimesheetModels/TimesheetApproval?selectDate=" + convertDate(startDate) + "&empId=" + empId; //Pass data to controller 
     alert(empId); // i get this alert before pass to controller 
     $('#ddlUsers').val(empId); 
    }); 

在控制器我有这个aciton，

public ActionResult TimesheetApproval(string SelectDate,string empId) 
     { 
      DateTime startDate; 
      if (!DateTime.TryParse(SelectDate, out startDate)) 
       startDate = DateTime.Today.AddDays(-(int)DateTime.Today.DayOfWeek); 

      int EmpId; 
      if (empId != null) 
       EmpId = Convert.ToInt32(empId); 
      else 
      { 
       EmpId = Convert.ToInt32(Session["EmpId"].ToString()); 
      } 

      string startDateCalendar = Convert.ToString(startDate.ToString("ddd MMM dd yyyy HH:mm:ss")) + " GMT+0530"; 
      ViewData["startDateCalendar"] = startDateCalendar; 

      DateTime endDate = startDate.AddDays(6); 


      List<TimesheetMatrix> _timesheetList = _timesheetDetailViewModel.GetAllProjectTasks(startDate, endDate, EmpId); 


      return View(_timesheetList); 
     } 

谁能帮我解决这个问题？

Answer 1

你应该做一个AJAX后而改变下拉菜单如下： -

$('#ddlUsers').change(function() { 
     alert($(this).val()); 
     var empId = $(this).val(); 
     startDate = $('#calendar').fullCalendar('getDate').startOf('week'); 

    $.ajax({ 
     url: "/TimesheetModels/TimesheetApproval?selectDate=" + convertDate(startDate) + "&empId=" + empId, 
     type: "Get", 
     success: function (data) { 
      //Any logic 
     } 
    }); 

     alert(empId); // i get this alert before pass to controller 
     $('#ddlUsers').val(empId); 
    }); 

通过这种方式，可以保留下拉。