如何在 Asp.net MVC4 中避免回发
本文关键字:MVC4 Asp net | 更新日期: 2023-09-27 18:32:58
我有一个表单,它将在两个不同的下拉列表中绑定一些值,并保存用户选择的值。现在我使用 RequiredIf 属性。它也可以正常工作。如果用户错过了选择值,它会显示消息,就像单击提交按钮后下拉列表中的某些选定值将变为默认值一样。我需要显示 meesage,而不会因为操作结果再次加载而对用户选择进行任何更改。
我的模型代码是;
> public ObservableCollection<Receipt> GetReceiptList()
> {
> ObservableCollection<Receipt> ReceiptList = new ObservableCollection<Receipt>();
> DataTable dtReceipt = new DataTable();
> dtReceipt = objDAL.ExecuteTable(CommandType.StoredProcedure, "sp_Receipt_Select");
> foreach (DataRow dr in dtReceipt.Rows)
> {
> ReceiptList.Add(new Receipt
> {
> Id = Convert.ToInt32(dr["REC_Id_I"]),
> Cust_Name = dr["CUS_Name_V"].ToString(),
> Pay_Amount = dr["REC_PaidAmount_M"].ToString(),
> Pay_Mode = dr["REC_PayMode_C"].ToString(),
> Bank_Name = dr["REC_BankName_V"].ToString(),
> Bank_Address = dr["REC_BankAddress"].ToString(),
> ChequeNo = dr["REC_ChequeNo_V"].ToString(),
> Cheque_Date = dr["REC_ChequeDate_D"].ToString(),
> });
> }
> return ReceiptList;
> }
控制代码
//AtLoad
public ActionResult ReceiptMaster(Receipt model)
{
ObservableCollection<Receipt> ReceiptList = new ObservableCollection<Receipt>();
Receipt Receipt = new Models.Receipt();
ReceiptList = Receipt.GetReceiptList();
ModelState.Clear();
Sales sales = new Models.Sales();
DataTable dtCustomer = new DataTable();
dtCustomer = sales.GetCustomerList();
IList<Sales> MyCustList = new List<Sales>();
foreach (DataRow mydataRow in dtCustomer.Rows)
{
MyCustList.Add(new Sales()
{
Cust_Id = Convert.ToInt32(mydataRow["Id"].ToString().Trim()),
Cust_Name = mydataRow["Name"].ToString().Trim()
});
}
var CustName = new SelectList(MyCustList, "Id", "Cust_Name");
ViewData["Cu_Name"] = CustName;
return View(ReceiptList);
}
//TO Insert
[HttpPost]
public ActionResult ReceiptMaster(Receipt model, string command)
{
Receipt Receipt = new Models.Receipt();
if (command == "Sumbit")
{
int Id = 0;
if (model.Pay_Mode == "C")
{
model.ChequeNo = "";
model.Cheque_Date = ("1/1/1753 12:00:00 AM");
model.Bank_Name = "";
model.Bank_Address = "";
}
if (ModelState.IsValid)
{
Id = Receipt.SaveReceipt(model.Id, model.Cust_Id, model.Pay_Amount, model.Pay_Mode, model.Bank_Name, model.Bank_Address, model.ChequeNo, model.Cheque_Date);
if (Id > 0)
{
ViewData["Success"] = "Product was saved successfully.";
ViewData["ControlView"] = 1;
return RedirectToAction("ReceiptMaster", "Admin");
}
return RedirectToAction("ReceiptMaster", "Admin");
}
ObservableCollection<Receipt> ReceiptList = new ObservableCollection<Receipt>();
ReceiptList = Receipt.GetReceiptList();
return View(ReceiptList);
}
ObservableCollection<Receipt> ReceiptList1 = new ObservableCollection<Receipt>();
ReceiptList1 = Receipt.GetReceiptList();
return View(ReceiptList1);
}
用于在下拉列表中绑定值的脚本
<script type="text/javascript">
$(document).ready(function () {
$.post('@Url.Action("SelectCustomerForDropJson", "Admin")', null, function (data) {
var select = $("#Cust_Id");
select.empty();
select.append($('<option/>', { value: '', text: '--Select--' }));
$.each(data, function (index, Data) {
select.append($('<option/>', {
value: Data.Value,
text: Data.Text
}));
});
});
});
</script>
将return RedirectToAction("ReceiptMaster", "Admin");
更改为
return View(model);
在您的帖子操作中
如果你使用了重定向到操作,那么它加载了HTTP GET方法。所以你的验证消息消失了.
只需复制然后粘贴我的以下代码而不是您的发布操作代码
并删除此行:Receipt Receipt = new Models.Receipt();
并调用模型而不是收据
//TO Insert
[HttpPost]
public ActionResult ReceiptMaster(Receipt model, string command)
{
if (command == "Sumbit")
{
int Id = 0;
if (model.Pay_Mode == "C")
{
model.ChequeNo = "";
model.Cheque_Date = ("1/1/1753 12:00:00 AM");
model.Bank_Name = "";
model.Bank_Address = "";
}
if (ModelState.IsValid)
{
Id = Receipt.SaveReceipt(model.Id, model.Cust_Id, model.Pay_Amount, model.Pay_Mode, model.Bank_Name, model.Bank_Address, model.ChequeNo, model.Cheque_Date);
if (Id > 0)
{
ViewData["Success"] = "Product was saved successfully.";
ViewData["ControlView"] = 1;
ObservableCollection<Receipt> ReceiptList = new ObservableCollection<Receipt>();
ReceiptList = Receipt.GetReceiptList();
return View(ReceiptList);
}
ObservableCollection<Receipt> ReceiptList = new ObservableCollection<Receipt>();
ReceiptList = Receipt.GetReceiptList();
return View(ReceiptList);
}
ObservableCollection<Receipt> ReceiptList = new ObservableCollection<Receipt>();
ReceiptList = Receipt.GetReceiptList();
return View(ReceiptList);
}
ObservableCollection<Receipt> ReceiptList1 = new ObservableCollection<Receipt>();
ReceiptList1 = Receipt.GetReceiptList();
return View(ReceiptList1);
}
编辑
请为ReceiptList
添加一个模型属性,并在 post 方法内部分配此属性中的值,现在仅返回模型(现在此 ReceiptList 值存储在新ReceiptList
属性中(,但您只返回您的 gridview 属性进行查看。但是验证消息和之前的值都存储在模型属性中,因此您需要在模型中添加一个用于ReceiptList
的属性,并在此属性中读取和写入网格视图数据。
现在您将尝试我的以下代码(必须查看我的评论,想象一下模型。收据列表是我们在您的模型中添加新属性(
//TO Insert
[HttpPost]
public ActionResult ReceiptMaster(Receipt model, string command)
{
if (command == "Sumbit")
{
int Id = 0;
if (model.Pay_Mode == "C")
{
model.ChequeNo = "";
model.Cheque_Date = ("1/1/1753 12:00:00 AM");
model.Bank_Name = "";
model.Bank_Address = "";
}
if (ModelState.IsValid)
{
Id = Receipt.SaveReceipt(model.Id, model.Cust_Id, model.Pay_Amount, model.Pay_Mode, model.Bank_Name, model.Bank_Address, model.ChequeNo, model.Cheque_Date);
if (Id > 0)
{
ViewData["Success"] = "Product was saved successfully.";
ViewData["ControlView"] = 1;
ObservableCollection<Receipt> ReceiptList = new ObservableCollection<Receipt>();
model.ReceiptList = Receipt.GetReceiptList();// model.ReceiptList is your model property
return View(model);
}
ObservableCollection<Receipt> ReceiptList = new ObservableCollection<Receipt>();
model.ReceiptList = Receipt.GetReceiptList();// model.ReceiptList is your model property
return View(model);
}
ObservableCollection<Receipt> ReceiptList = new ObservableCollection<Receipt>();
ReceiptList = Receipt.GetReceiptList();
return View(ReceiptList);
}
ObservableCollection<Receipt> ReceiptList = new ObservableCollection<Receipt>();
model.ReceiptList = Receipt.GetReceiptList();// model.ReceiptList is your model property
return View(model);
}
在模型类中添加属性,例如
ObservableCollection<Receipt> ReceiptList {get :set;}
我不是 100% 确定您在问什么,但听起来您需要在 RequiredIf 属性上启用客户端验证。
下面的代码阻止 %100 回发,请尝试。
您需要使用 Json 以防止页面中的完整回发。之后,您必须返回到"部分视图"。
例如;
网页代码:
<input type="text" id="UserName" name="UserName"/>
<input type="button" onclick="ButonClick()" value="Enter"/>
Javascript 代码:
function ButonClick() {
var data= {
UserName: $('#UserName').val(),
};
$.ajax({
url: "/Home/MyActionResult",
type: "POST",
dataType: "json",
contentType: 'application/json',
data: JSON.stringify(data),
控制器:
public ActionResult MyActionResult(string UserName,MyModel model)
{
var stringView = RenderRazorViewToString("_YourPartialView", model);
return Json(stringView, JsonRequestBehavior.AllowGet);
}
注意:
您需要以下代码来呈现 json 的部分视图。
下面也添加到您的控制器中。
public string RenderRazorViewToString(string viewName, object model)
{
ViewData.Model = model;
using (var sw = new StringWriter())
{
var viewResult = ViewEngines.Engines.FindPartialView(ControllerContext, viewName);
var viewContext = new ViewContext(ControllerContext, viewResult.View, ViewData, TempData, sw);
viewResult.View.Render(viewContext, sw);
viewResult.ViewEngine.ReleaseView(ControllerContext, viewResult.View);
return sw.GetStringBuilder().ToString();
}
}