MVC :: Updating ViewModel Values On HttpPost?
Sep 3, 2010
I am just getting started with MVC after many years of WebForms development.
I have a very simple page with two textbox fields, one called Input where a user will enter something, and one called Output where I want to return some string after they post the form, much like a postback scenario in WebForms. I have the View connected to a ViewModel for strong typing.
The ViewModel:
[Code]....
The View:
[Code]....
The Controller:
[Code]....
The problem I have is that the output text "Here is some response" never gets displayed, even though I modify the value in the HttpPost method and return the viewmodel to the view. Unless (just tried it) I set the textarea to disabled with:
[Code]....
Can someone explain this behavior? It seems as some "magic" assumes that whatever was in the input fields before the HttpPost should also be there after the post, similar to what ViewState does in WebForms.
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Feb 23, 2011
Simple question. I have an mvc controller that has method:
[code]....
The form is a non-trivial form with a simple textbox.
Question - how on earth do I access the parameter values? I am not posting from a View, the post is coming externally. I'm assuming there is a collection of key/value pairs I have access to. I tried Request.Params.Get("simpleTextBox"); but it returns error "Sorry, an error occurred while processing your request.".
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Mar 17, 2011
Here is my Controller:
public ActionResult Deposit()
{
return View();
}
[HttpPost]
public ActionResult Deposit(DepositTicket dt)
{
using (var db = new MatchGamingEntities())
{
MembershipUser currentUser = Membership.GetUser();
Guid UserId = (Guid)currentUser.ProviderUserKey;
var AccountId = from a in db.Accounts
where a.UserId == UserId
select a.AccountId;
BankTransaction transaction = new BankTransaction();
transaction.Amount = dt.Amount;
transaction.AccountId = AccountId.SingleOrDefault();
transaction.Created = DateTime.Today;
transaction.TransactionType = "Credit";
Debug.Write("Amount: " + transaction.Amount + " AccountId " + transaction.AccountId);
db.BankTransactions.AddObject(transaction);
db.SaveChanges();
return View();
}
}
Here is my View:
[Code]....
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Jul 30, 2010
I'm trying to pass the Question parameter from SubmitAnswer to Index.. But it's not working that well...
Code:
[Code]....
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Jan 8, 2011
Prior to using a ViewModel, I could easily pass the "soon to be edited" object directly to the view without needing to fuss over setting individual properties etc as the View conveniently accepted the Employee type directly..
[HttpGet]
public ActionResult EditEmployee(int? id)
{
EmployeeRepository ER = new EmployeeRepository();
Employee SomeEmployee = ER.GetEmployee(id.Value);
if(SomeEmployee!=null)
return View(SomeEmployee);
But now I'm using a ViewModel with DataAnnotations attributes applied over the top of various properties for validation purposes. Which creates a problem.. After fetching the "soon to be edited" object from the db, setting the ViewModel's values is suddenly a whole lot more complicated. I can't simply pass the retrieved object straight to the view, as the View now expects the VMEmployee type instead. I would like to be able to do something like:
[HttpGet]
public ActionResult EditEmployee(int? id)
{
EmployeeRepository ER = new EmployeeRepository();
Employee SomeEmployee = ER.GetEmployee(id.Value);
if(SomeEmployee!=null)
return View(new VMEmployee(SomeEmployee));
All paths seem to lead to a huge constructor which manually sets the values of each individual property. But I never had to do that before when I wasn't using a ViewModel. Model binding was a blessing! My objects also have complex child objects, which my form is also collecting values for, so this would be a huge/verbose task against DRY principals. I don't even really want to use a ViewModel, but am forced to because I need two different DataAnnotations rule sets for different validation scenarios applied to the same object.
All I want to do is be able to have two different DataAnnotations rule sets for different scenarios. I.e. public-facing www site vs internal-facing admin site. DataAnnotations doesn't seem to be flexible enough to easily cater for this common need. I've tried AutoMapper, but it throws an error saying it can't map my object types, I suspect because Employee was auto-generated by LINQ to SQL. What is the most elegant way to achieve this while sticking to DRY principals?
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Jun 17, 2010
i am creating inintalizing a viewmodel with the following code in an create action;
[Code]....
the class applications is a LINQ to SQL Class and it has a property called VacancyID.
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I am using Asp.net 3.5 listview control. In item_updating event I am using this code...
dim country as string = Dim country As String = e.NewValues("country_name").ToString.Replace(" ", "")
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Sep 4, 2010
I want to use a grid in asp.net MVC application. I did an evaluation and found JQgrid to be optimum from performance point of view(minimum posback). What is your views about this and suggest if you have any other grid in mind which performs better and which is free of cost for commercial usage. Also now a want to post data from edited grid back to server from Jquery base JQgrid .Should i do it using httpget or httppost. If i use HTTPPOST, what should i calculate in controller and what in model As per examples available on net, people are putting calculation logic in controller(See article [URL] I need to know whether it is good practice to put business logic in controller rather than restricting it for routing to view and model.
Controller code as given in mentioned website is having following code
public ActionResult DynamicGridData
(string sidx, string sord, int page, int rows) {
var context = new HaackOverflowDataContext();
int pageIndex = Convert.ToInt32(page) - 1;
int pageSize = rows;
int totalRecords = context.Questions.Count();
int totalPages = (int)Math.Ceiling((float)totalRecords / (float)pageSize);
var questions = context.Questions
.OrderBy(sidx + " " + sord)
.Skip(pageIndex * pageSize)
.Take(pageSize);
var jsonData = new {
total = totalPages,
page = page,
records = totalRecords,
rows = (
from question in questions
select new {
i = question.Id,
cell = new string[] {
question.Id.ToString(), question.Votes.ToString(), question.Title
}
}).ToArray()
};
return Json(jsonData);
}
design practice and sample to implement grid with HTTPpost feature
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Nov 22, 2010
I am using a view to create some new categories in the DB but the object the [httpost] create method receives is empty, now this does not always happens. I did double check with other catalogscontrollers and so far the implementation is the same... It only happensds when i try to create a new category the CategoryController
[Code]....
the ViewModel
[Code]....
my create view is strongly typed to ViewModel and has this relevant code create.aspx
[Code]....
and my ascx file is strongly typed to the entity model directly. when the "create" button is pressed and Exception is catched and returns the same view... I have implemented this for other catalogs and works fine except for this one...any clues... by the way i´m using entity model ...
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Mar 31, 2010
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Name : Textbox1
Location: Textbox2
Gender : Dropdownlist1
[code]...
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[code]....
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[Code]....
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Mar 24, 2011
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If I refresh the page after that then datagrid shows the updated value.
Code On Update Command:
protected void MySQLDataGrid2_UpdateCommand(object source, DataGridCommandEventArgs e)
{
string newData;
TextBox aTextBox;
aTextBox = (TextBox)(e.Item.Cells[0].Controls[0]);
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The action code is below;
[Code]....
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[Code].... I wrote HttpPost in controller
[Code]....
my page has next code:
[Code]....
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<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always" >
<ContentTemplate>
<asp:Image ID="Image1" runat="server" ImageUrl="~/captcha.aspx" /> [code]....
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I have just started using MVC2 in VS2010, and I noticed that on the Register page DataType.EmailAddress doesn't actually do any validation, so it does not check whether or not the Email Address entered is valid. Should I write some email validation code in the HttpPost Register method of my AccountController, or is there another way to do this?
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[Code]....
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