如何在MVC中的控制器中获取DropDownList SelectedValue [英] How to get DropDownList SelectedValue in Controller in MVC
问题描述
我有下拉列表,是从数据库中填写的.现在我需要在 Controller 中获取选定的值进行一些操作.但没有得到这个想法.我试过的代码.
I have dropdownlist, which I have filled from database. Now I need to get the selected value in Controller do some manipulation. But not getting the idea. Code which I have tried.
public class MobileViewModel
{
public List<tbInsertMobile> MobileList;
public SelectList Vendor { get; set; }
}
控制器
public ActionResult ShowAllMobileDetails()
{
MobileViewModel MV = new MobileViewModel();
MV.MobileList = db.Usp_InsertUpdateDelete(null, "", "", null, "", 4, MergeOption.AppendOnly).ToList();
MV.Vendor = new SelectList(db.Usp_VendorList(), "VendorId", "VendorName");
return View(MV);
}
[HttpPost]
public ActionResult ShowAllMobileDetails(MobileViewModel MV)
{
string strDDLValue = ""; // Here i need the dropdownlist value
return View(MV);
}
查看
<table>
<tr>
<td>Mobile Manufacured</td>
<td>@Html.DropDownList("ddlVendor", Model.Vendor, "Select Manufacurer") </td>
</tr>
<tr>
<td>
</td>
<td>
<input id="Submit1" type="submit" value="search" />
</td>
</tr>
</table>
推荐答案
第一种方法(通过 Request 或 FormCollection):
您可以使用 Request.Form
从 Request
读取它,您的下拉列表名称是 ddlVendor
所以传递 ddlVendor
键入 formCollection 以获取其由表单发布的值:
1st Approach (via Request or FormCollection):
You can read it from Request
using Request.Form
, your dropdown name is ddlVendor
so pass ddlVendor
key in the formCollection to get its value that is posted by form:
string strDDLValue = Request.Form["ddlVendor"].ToString();
或使用FormCollection
:
[HttpPost]
public ActionResult ShowAllMobileDetails(MobileViewModel MV,FormCollection form)
{
string strDDLValue = form["ddlVendor"].ToString();
return View(MV);
}
第二种方法(通过模型):
如果你想要模型绑定,那么在模型中添加一个属性:
2nd Approach (Via Model):
If you want with Model binding then add a property in Model:
public class MobileViewModel
{
public List<tbInsertMobile> MobileList;
public SelectList Vendor { get; set; }
public string SelectedVendor {get;set;}
}
并在视图中:
@Html.DropDownListFor(m=>m.SelectedVendor , Model.Vendor, "Select Manufacurer")
并在行动中:
[HttpPost]
public ActionResult ShowAllMobileDetails(MobileViewModel MV)
{
string SelectedValue = MV.SelectedVendor;
return View(MV);
}
更新:
如果您还想发布所选项目的文本,则必须添加一个隐藏字段,并在下拉选择中更改隐藏字段中的所选项目文本:
UPDATE:
If you want to post the text of selected item as well, you have to add a hidden field and on drop down selection change set selected item text in the hidden field:
public class MobileViewModel
{
public List<tbInsertMobile> MobileList;
public SelectList Vendor { get; set; }
public string SelectVendor {get;set;}
public string SelectedvendorText { get; set; }
}
使用jquery设置隐藏字段:
use jquery to set hidden field:
<script type="text/javascript">
$(function(){
$("#SelectedVendor").on("change", function {
$("#SelectedvendorText").val($(this).text());
});
});
</script>
@Html.DropDownListFor(m=>m.SelectedVendor , Model.Vendor, "Select Manufacurer")
@Html.HiddenFor(m=>m.SelectedvendorText)
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