我提交按钮时下拉列表值为空？
当我点击提交按钮时，下拉列表country list国家ID值被传递给控制器..当我点击F10键盘按钮时，国家绑定方法被调用。所以再次返回起点所以国家价值再次为Null下面我附上了截图：
<div class="page-content">
<div class="container-fluid">
<header class="section-header">
<div class="tbl">
<div class="tbl-row">
<div class="tbl-cell">
<h2>Company Registration Form</h2>
</div>
</div>
</div>
</header>
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)
<section class="tabs-section">
<div class="tabs-section-nav tabs-section-nav-icons">
<div class="tbl">
<ul class="nav" role="tablist">
<li class="nav-item">
<a class="nav-link active" href="#tabs-1-tab-1" role="tab" data-toggle="tab">
<span class="nav-link-in">
<i class="font-icon font-icon-cogwheel"></i>
Company Registration Form
</span>
</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#tabs-1-tab-2" role="tab" data-toggle="tab">
<span class="nav-link-in">
<span class="glyphicon glyphicon-music"></span>
Company Social Network
</span>
</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#tabs-1-tab-3" role="tab" data-toggle="tab">
<span class="nav-link-in">
<i class="fa fa-product-hunt"></i>
Company Reference
</span>
</a>
</li>
</ul>
</div>
</div><!--.tabs-section-nav-->
<div class="tab-content">
<div role="tabpanel" class="tab-pane fade in active show" id="tabs-1-tab-1">
<br />
<br />
<section>
<div>
<div class="row">
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => Model.company.CompanyName, new { @class = "form-label semibold control-label" })
@Html.TextBoxFor(model => model.company.CompanyName, new { @class = "form-control", @id = "txtCompanyName", placeholder = "Enter the Company Name" })
@Html.ValidationMessageFor(model => model.company.CompanyName)
</fieldset>
</div>
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.ShortName, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.company.ShortName, new { @class = "form-control", @id = "txtShortName", placeholder = "Enter the Short Name" })
@Html.ValidationMessageFor(model => model.company.ShortName)
</fieldset>
</div>
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.Division, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.company.Division, new { @class = "form-control", @id = "txtDivision", placeholder = "Enter the Division" })
@Html.ValidationMessageFor(model => model.company.Division)
</fieldset>
</div>
</div><!--.row-->
<br />
<div class="row">
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.Email, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.company.Email, new { @class = "form-control", @id = "txtEmail", placeholder = "Enter your Email" })
@Html.ValidationMessageFor(model => model.company.Email)
</fieldset>
</div>
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.Address1, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.company.Address1, new { @class = "form-control", @id = "txtAddress1", placeholder = "Enter your Address Line 1" })
@Html.ValidationMessageFor(model => model.company.Address1)
</fieldset>
</div>
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.Address2, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.company.Address2, new { @class = "form-control", @id = "txtAddress2", placeholder = "Enter your Address Line 2" })
</fieldset>
</div>
</div><!--.row-->
<br />
<div class="row">
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.Country, new { @class = "form-label semibold" })
@Html.DropDownList("Country", null, "--- Select Country ---", new { @class = "select2-arrow" })
</fieldset>
</div>
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.State, new { @class = "form-label semibold" })
<select id="state" class="select2-arrow"></select>
</fieldset>
</div>
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.City, new { @class = "form-label semibold" })
<select id="city" class="select2-arrow"></select><br />
</fieldset>
</div>
</div><!--.row-->
<br />
<div class="row">
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.Pincode, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.company.Pincode, new { @class = "form-control", @id = "txtPincode", placeholder = "Enter your Pincode" })
@Html.ValidationMessageFor(model => model.company.Pincode)
</fieldset>
</div>
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.CountryCode, new { @class = "form-label semibold" })
@*@Html.DropDownList("CountryCode", null, "---Select CountryCode---", new { @class = "select2-arrow" })*@
</fieldset>
</div>
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.MobileNo, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.company.MobileNo, new { @class = "form-control", @id = "txtMobileNo", placeholder = "Enter your Mobile Number" })
@Html.ValidationMessageFor(model => model.company.MobileNo)
</fieldset>
</div>
</div><!--.row-->
<br />
<div class="row">
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.PhoneNo, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.company.PhoneNo, new { @class = "form-control", @id = "txtPhoneNo", placeholder = "Enter your PhoneNo" })
</fieldset>
</div>
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.PanNo, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.company.PanNo, new { @class = "form-control", @id = "txtPanNo", placeholder = "Enter Company PanNo" })
</fieldset>
</div>
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.TinNo, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.company.TinNo, new { @class = "form-control", @id = "txtTinNo", placeholder = "Enter Company TinNo" })
</fieldset>
</div>
</div><!--.row-->
<br />
<div class="row">
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.GSTno, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.company.GSTno, new { @class = "form-control", @id = "txtGSTno", placeholder = "Enter Company GSTno" })
</fieldset>
</div>
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.company.IECCode, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.company.IECCode, new { @class = "form-control", @id = "txtIECCode", placeholder = "Enter Company IECCode" })
</fieldset>
</div>
</div><!--.row-->
<br />
<div class="row">
<div class="col-lg-4">
<fieldset class="form-group">
<label class="form-label semibold">Upload Company Logo</label>
<input type="file" name="file" id="txtUploadImage" style="cursor:pointer;" />
</fieldset>
</div>
<div class="col-lg-4">
<fieldset class="form-group">
<label class="form-label semibold">Perview Image</label>
<img id="image_upload_preview" src="http://placehold.it/100x100" alt="your image" />
<a id="remove" onclick="javascript:ClearFileUploadControl();" style="display: none; cursor: pointer;">Remove</a>
</fieldset>
</div>
</div>
<br />
<input type="submit" name="Submit" id="SaveCompany" value="Save" class="btn btn-rounded btn-inline btn-success" />
</div>
</section>
</div><!--.tab-pane-->
<div role="tabpanel" class="tab-pane fade" id="tabs-1-tab-2">
<br />
<section>
<div>
<div class="row">
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.CompanySocial.FaceBookID, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.CompanySocial.FaceBookID, new { @class = "form-control", @id = "txtFaceBookID", placeholder = "Enter the Facebook Link" })
</fieldset>
</div>
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.CompanySocial.TwitterID, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.CompanySocial.TwitterID, new { @class = "form-control", @id = "txtTwitterID", placeholder = "Enter the Twitter Link" })
</fieldset>
</div>
<div class="col-lg-4">
<fieldset class="form-group">
@Html.LabelFor(model => model.CompanySocial.linkedinID, new { @class = "form-label semibold" })
@Html.TextBoxFor(model => model.CompanySocial.linkedinID, new { @class = "form-control", @id = "txtlinkedinID", placeholder = "Enter the Linkedin Link" })
</fieldset>
</div>
</div><!--.row-->
</div>
</section>
<input type="submit" name="Submit" value="Previous" class="btn btn-rounded btn-inline btn-primary prev-step " />
<input type="submit" name="Submit" id="saveSocial" value="Next" class="btn btn-rounded btn-inline btn-success" />
</div><!--.tab-pane-->
<div role="tabpanel" class="tab-pane fade" id="tabs-1-tab-3">
Tab 3
<br />
<br />
<input type="submit" name="Submit" value="Previous" class="btn btn-rounded btn-inline btn-primary prev-step" />
<input type="submit" name="Submit" value="Finish" class="btn btn-rounded btn-inline btn-success" />
</div><!--.tab-pane-->
</div><!--.tab-content-->
</section><!--.tabs-section-->
}
</div>
</div>
脚本：
<script>
function GetInfo() {
var Company = {
CompanyName: $("#txtCompanyName").val(), ShortName: $("#txtShortName").val(), Division: $("#txtDivision").val(), Email: $("#txtEmail").val(), Address1: $("#txtAddress1").val(), Address2: $("#txtAddress2").val(), Country: $("#Country").val(), State: $("#state").val(), City: $("#city").val(),
Pincode: $("#txtPincode").val(), MobileNo: $("#txtMobileNo").val(), PhoneNo: $("#txtPhoneNo").val(), PanNo: $("#txtPanNo").val(), TinNo: $("#txtTinNo").val(), GSTno: $("#txtGSTno").val(), IECCode: $("#txtIECCode").val()
};
var mainModel = {};
mainModel.Company = Company;
$.ajax({
type: "POST",
url: "/Company/AddCompany",
data: JSON.stringify(mainModel),
contentType: "application/json; charset=utf-8",
dataType: "json",
success: OnSuccess,
failure: function (response) {
alert(response.d);
}
});
}
function OnSuccess(response) {
alert(response.d);
}
$(document).ready(function () {
$("#saveSocial").click(function (e) {
e.preventDefault();
GetInfo1();
});
$("#SaveCompany").click(function (e) {
//e.preventDefault();
GetInfo();
});
});
function GetInfo1() {
var Social = { FaceBookID: $("#txtFaceBookID").val(), TwitterID: $("#txtTwitterID").val(), linkedinID: $("#txtlinkedinID").val() };
var mainModel = {};
mainModel.CompanySocial = Social;
$.ajax({
type: "POST",
url: "/Company/AddSocial",
data: JSON.stringify(mainModel),
contentType: "application/json; charset=utf-8",
dataType: "json",
success: OnSuccess,
failure: function (response) {
alert(response.d);
}
});
}
</script>
<script>
$(document).ready(function () {
$("#Country").change(function () {
var id = $(this).val();
$("#state").empty();
$.get("State_Bind", { CountryID: id }, function (data) {
var v = "<option>--- Select State ---</option>";
$.each(data, function (i, v1) {
v += "<option value=" + v1.Value + ">" + v1.Text + "</option>";
});
$("#state").html(v);
});
});
$("#state").change(function () {
var id = $(this).val();
$("#city").empty();
$.get("City_Bind", { StateID: id }, function (data) {
var v = "<option>--- Select City---</option>";
$.each(data, function (i, v1) {
v += "<option value=" + v1.Value + ">" + v1.Text + "</option>";
});
$("#city").html(v);
});
});
});
</script>
班级值：
public int Country { get; set; }
public int State { get; set; }
public int City { get; set; }
截屏：
的ActionResult：
[HttpPost]
public ActionResult AddCompany(MainModel mainModel)
{
try
{
Country_Bind();
if (ModelState.IsValid)
{
dp obj = new dp();
if (obj.AddNewCompany(mainModel))
{
ViewBag.Message = "Company added successfully";
}
}
return View();
}
catch
{
return View();
}
}
国家/地区代码：
public void Country_Bind()
{
DataSet ds = dblayer.Get_Country();
List<SelectListItem> coutrylist = new List<SelectListItem>();
foreach (DataRow dr in ds.Tables[0].Rows)
{
coutrylist.Add(new SelectListItem { Text = dr["CountryName"].ToString(), Value = dr["CountryID"].ToString() });
}
ViewBag.Country = coutrylist;
}
1 个答案:
答案 0 :(得分：2)
您当前正在调用Country_Bind()方法作为您的httppost操作方法中的第一个语句。当您想要在渲染相同视图时重新渲染下拉列表时，实际上需要这样做。
如果你没有做ajax帖子，你应该遵循PRG pattern。成功保存数据后，您应该重定向到呈现视图的GET操作方法。如果Modelstate验证失败，那就是当您返回相同的视图时（以便您可以向用户显示验证消息），并且您需要在此之前重新填充下拉数据。
执行重定向时，ViewData无法传输邮件。请改用TempData。
[HttpPost]
public ActionResult AddCompany(MainModel mainModel)
{
try
{
if (ModelState.IsValid)
{
dp obj = new dp();
if (obj.AddNewCompany(mainModel))
{
TempData.Message = "Company added successfully";
return RedirectToAction("CompanyList");
}
}
// We need to repopulate the data needed for rendering dropdown
Country_Bind();
return View(mainModel);
}
catch(Exception ex)
{
// to do : Make sure to log the error
return View("Error");
}
}
在您的情况下，当您执行ajax帖子返回重定向结果时没有意义。如果需要，您可以将url返回到下一页作为json响应的一部分，并在您的ajax调用success / done事件处理程序中使用它并执行适当的操作（重定向到新页面/显示消息给用户）
[HttpPost]
public ActionResult AddCompany(MainModel mainModel)
{
try
{
if (ModelState.IsValid)
{
dp obj = new dp();
if (obj.AddNewCompany(mainModel))
{
return Json(new { Message="Company added successfully"});
}
}
return Json(new { Message="Validation errors!"});
}
catch(Exception ex)
{
// must log the exception
return Json(new { Message="Error "});
}
}
确保更新ajax调用的success / done事件处理程序以读取响应（json并执行类似向用户显示消息/隐藏或显示下一个选项卡的内容）
我还注意到你的ajaxifying代码存在问题。由于您要提交ajax表单，因此应通过调用event.preventDefault方法来阻止默认表单提交行为。
$("#SaveCompany").click(function (e) {
e.preventDefault();
GetInfo();
});
我还建议使用特定于视图的平坦视图模型。所以你的属性不会是嵌套级别，当你使用辅助方法（TextBoxFor etx）时，它会生成正确的输入字段名称，你不需要手动构建你要发送的Js对象 。您可以在表单对象上使用jquery serialize()方法，并将其作为ajax调用的数据发送。
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