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我有一个第二个下拉过滤信息的问题，筛选信息，这些信息应该取决于第一个下拉的第一选择，我想知道我怎么能筛选信息如何在下拉取决于另一个下拉列表的第一选择
这是我的代码：
C＃控制器：
[HttpGet]
public IActionResult SubTrails()
{
try
{
var n = _unitOfWork.SubTrails.GetAll().ToList();
if (n == null)
{
return NoContent();
}
return new ObjectResult(n);
}
catch (Exception ex)
{
_logger.LogError(ex.ToString());
return StatusCode(StatusCodes.Status500InternalServerError, new { Message = "Internal Server Error" });
}
}
[HttpGet]
public IActionResult Levels()
{
try
{
var n = _unitOfWork.Levels.GetAll().ToList();
if (n == null)
{
return NoContent();
}
return new ObjectResult(n);
}
catch (Exception ex)
{
_logger.LogError(ex.ToString());
return StatusCode(StatusCodes.Status500InternalServerError, new { Message = "Internal Server Error" });
}
}
[HttpGet]
public IActionResult Trails()
{
try
{
var n = _unitOfWork.Trails.GetAll().ToList();
if (n == null)
{
return NoContent();
}
return new ObjectResult(n);
}
catch (Exception ex)
{
_logger.LogError(ex.ToString());
return StatusCode(StatusCodes.Status500InternalServerError, new { Message = "Internal Server Error" });
}
}
CSHTML：
@model DefinityFirst.Mobile.Admin.Web.Services.Marvel.Contracts.ListTrailSubTrailLevelContract
@inject DefinityFirst.Mobile.Admin.Web.Services.Marvel.IMarvelServices DropDownDataHelper
@{
ViewBag.Title = "Create";
}@if (!ViewData.ModelState.IsValid)
{
<div class="alert alert-danger alert-dismissible" role="alert">
<button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button>
<strong>Warning!</strong> @Html.ValidationMessage("Error")
</div>
}
<h2>Create</h2>
<p>New TrailSubTRailLEvel</p>
@using (Html.BeginForm("TrailSubTrailLevel", "TrailSubTrailLevel", FormMethod.Post, new { id = "demoForm" }))
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>Trail</h4>
<div class="form-group">
@Html.Label("", "Trail", new { @class = "control-label col-md-2" })
<div class="col-md-10" id = "partialDiv">
@*@Html.DropDownListFor(model => model.TrailContract.Responsable.Id, Model.ManagersList, "Select one", new { @class = "form-control" })*@
@Html.DropDownListFor(model => model.TrailId, await DropDownDataHelper.GetTrailsDdl(), "Select one", new { @class = "form-control", onchange = "SelectedIndexChanged()" })
@Html.ValidationMessageFor(model => model.TrailId, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.Label("", "SubTrail", new { @class = "control-label col-md-2", @name = "Subtrail", @id= "Subtrail" })
<div class="col-md-10">
@*@Html.DropDownListFor(model => model.TrailContract.Responsable.Id, Model.ManagersList, "Select one", new { @class = "form-control" })*@
@Html.DropDownListFor(model => model.SubtrailId, await DropDownDataHelper.SubTrailDdl(), "Select one", new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.SubtrailId, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.Label("", "Level", new { @class = "control-label col-md-2", @name = "Level", @id = "Level" })
<div class="col-md-10">
@*@Html.DropDownListFor(model => model.TrailContract.Responsable.Id, Model.ManagersList, "Select one", new { @class = "form-control" })*@
@Html.DropDownListFor(model => model.LevelId, await DropDownDataHelper.LevelsDdl(), "Select one", new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.LevelId, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create" class="btn btn-success" />
</div>
</div>
</div>
}
<div>
@Html.ActionLink("Back to List", "Index")
</div>
@section Scripts {
<script type="text/javascript">
$('#SubtrailId').hide();
$('#LevelId').hide();
$("#Subtrail").hide();
$("#Level").hide();
$('#TrailId').on('change', function() {
// alert("este valor es de trail", this.value)
if (this.value != 0) {
$("#Subtrail").show();
$('#SubtrailId').show();
alert(this.value)
} else {
$('#SubtrailId').hide();
$('#LevelId').hide();
// alert("no es diferente ")
}
})
$('#SubtrailId').on('change', function() {
//alert("este valor es de subtrail", this.value)
if (this.value != 0) {
$("#Level").show();
$('#LevelId').show();
//alert(this.value)
} else {
$('#LevelId').hide();
// alert("no es diferente ")
}
})
function SelectedIndexChanged() {
//Form post
//alert("esta validacion jala", this.value)
document.demoForm.submit();
}
</script>
}
但是，当我进入查看加载所有数据只有一次，当你在下拉菜单中更改选项不会重新加载使用不引人注目的AJAX 数据View
研究[本DotNetFiddle代码中的状态列表（https://dotnetfiddle.net/1bPZym） –
的可能的复制[获取使用JavaScript在下拉列表中选择值？（http://stackoverflow.com/questions/1085801/get-selected-value-in-dropdown-列表使用的JavaScript） –