C# 如何在MVC5中将选择选项值从视图传递给控制器
视图: 我无法在roleValue1中获取选择选项值C# 如何在MVC5中将选择选项值从视图传递给控制器,c#,html,asp.net-mvc,asp.net-mvc-5,C#,Html,Asp.net Mvc,Asp.net Mvc 5,视图: 我无法在roleValue1中获取选择选项值 我想从roleValue1中获取值,并使用它触发视图中的另一个下拉列表 如果你看一下标签的语法,它是这样的 public class APIController : Controller { public ActionResult Index(FormCollection formCollection) { dynamic mymodel = new ExpandoObject(); Segme
我想从roleValue1中获取值,并使用它触发视图中的另一个下拉列表 如果你看一下标签的语法,它是这样的
public class APIController : Controller
{
public ActionResult Index(FormCollection formCollection)
{
dynamic mymodel = new ExpandoObject();
SegmentRepository segment = new SegmentRepository();
mymodel.listofSegments = segment.GetSegmentation();
String roleValue1 = formCollection["Segmentation"];
return View(mymodel);
}
}
<select>
<option value="volvo">Volvo</option>
</select>
您必须设置每个选项的值,但在您的情况下,您只是提供文本而不是值。所以应该是这样
public class APIController : Controller
{
public ActionResult Index(FormCollection formCollection)
{
dynamic mymodel = new ExpandoObject();
SegmentRepository segment = new SegmentRepository();
mymodel.listofSegments = segment.GetSegmentation();
String roleValue1 = formCollection["Segmentation"];
return View(mymodel);
}
}
<select>
<option value="volvo">Volvo</option>
</select>
您必须更改:
@using (Html.BeginForm("Index", "APIController",FormMethod.Post))
{
<select id="Segmentation" name="Segmentation">
@foreach (var item in Model.listofSegments)
{
<option value="@item">@item</option> //if the value is same as text
}
</select>
<input type="submit" value="Send" />
}
致:
目前您在这里有两个问题: 1 select元素内的选项标记要求使用FormCollection实例发布value属性 2 BeginForm应使用适当的控制器名称,并在相应的控制器操作方法上标记HttpPost属性。默认情况下,控制器操作方法使用HttpGet 正确的用法如下: 看法 如果要将FraveCube传递到动态ExpEntoObjor,则有一个要考虑的帖子:.< 此外,如果要传递select option value以将选项值插入同一视图页上的其他select元素中,则需要在客户端使用传递的数据中使用jQuery AJAX回调$.AJAX,并在成功响应后使用append方法添加选项元素。查看代码 控制器代码
您想使用层叠HTML选择吗?如果我的猜测是正确的,考虑使用客户端JS,它触发Ajax调用到控制器动作和返回响应数据,可能使用部分视图或Ajax成功,它可以附加第二个下拉选项元素。
@using (Html.BeginForm("Index", "APIController", FormMethod.Post))
@using (Html.BeginForm("Index", "API", FormMethod.Post))
@using (Html.BeginForm("Index", "API", FormMethod.Post))
{
<select id="Segmentation" name="Segmentation">
@foreach (var item in Model.listofSegments)
{
<option value="@item">@item</option>
}
</select>
<input type="submit" value="Send" />
}
public class APIController : Controller
{
[HttpPost]
public ActionResult Index(FormCollection formCollection)
{
dynamic mymodel = new ExpandoObject();
SegmentRepository segment = new SegmentRepository();
mymodel.listofSegments = segment.GetSegmentation();
String roleValue1 = formCollection["Segmentation"];
return View(mymodel);
}
}
@model dynamic
@{
ViewBag.Title = "ddl";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>ddl</h2>
<div>
@using (Html.BeginForm("ActionPostData", "Demo", FormMethod.Post))
{
<select name="Segmentation">
<option selected value="0">---Select---</option>
@foreach (var item in Model)
{
<option value="@item.Value">@item.Text</option>
}
</select>
<input type="submit" value="Send" />
}
</div>
public ActionResult Ddl()
{
var segmentList = new List<listofSegments>();
listofSegments segmentItem;
var strArr = new string[] { "Jaipur", "Kota", "Bhilwara", "Udaipur", "Chitorgar", "Ajmer", "Jodhpur" };
for (int index = 0; index < strArr.Length; index++)
{
segmentItem = new listofSegments();
segmentItem.Text = strArr[index];
segmentItem.Value = (index + 1).ToString();
segmentList.Add(segmentItem);
}
return View(segmentList);
}
[HttpPost]
public ActionResult ActionPostData(string Segmentation)
{
return RedirectToAction("Ddl");
}
public class listofSegments
{
public string Text { get; set; }
public string Value { get; set; }
}