MVC2 Model Binding Does Not POST Back Hidden Values?
Jul 25, 2010
I have a /Register [GET] Action in the controller that pre-poluates a view-model with a string and an integer and returns: return View(myModel);I can see the string being populated in the textarea and the id being populated in a hidden input. Yet when the form gets POSTed, the string value is null and the int value is 0. I verified that both values are posted to the server but the model received in the POST action is missing those values.
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Similar Messages:
Aug 25, 2010
Currently, I am working with ASP.NET MVC1 and am still learning about Model Binding and how values from a View are passed back to the Controller / Model. Specifically, I want take an existing Model, create a Table and populate the Rows of the Table, allow the user to edit some fields and pass it back. In my example, I have a Class called "Ingredient" which has 4 public accessories: Name, Barcode, Amount, and Unit.
[Code]....
Or is this not possible? (Basically, I'm trying to re-create a datagrid where certain fields are editable and certain are not...)
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Jan 10, 2011
I have a parent control that has an instance of a HiddenField child control. I am using CreateChildControls() to add it. Everything works client side including the values being added to the field. However, on postback, the reference to the field is null
here is the code
[code]....
I have tried simply relying on the ViewState ... then also attempted using FindControl(). Neither works, it comes up as a null reference ... any input on what is going here?
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Apr 15, 2010
[Code]....
What I want to achieve is the ID of the property: item.Item.ID to be bound to the ID from the (route)URL. However I can't get it to work. I tried using [Bind()] attribute.
I fixed it now using a hidden field in the form like so:
<%= Html.HiddenFor(model => model.Item.ID)%>
However this feels a bit icky. I'd like to know if there is a better cleaner way of doing this?
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Jan 6, 2011
I am using ASP.Net MVC2 and LINQ to SQL. I am using DataAnnotations and model binding in conjunction with a Form/View and its working beautifully well. Loving that.. My view is an "Add new Employee" form that's adding a new "Employee" complex object. Every Employee also has a child complex object called an "Address".
I am using the bound Html helpers in the view, such as Html.TextBoxFor(model => model.NewEmployee.FirstName) for example. Working beautifully well, validating beautifully well both client and server and coming into the controller fully populated and ready to be saved! Exciting.. ModelState.IsValid returns true and I go to save the new Employee.
The Employee is created fine but the system also creates a blank/new Address record in my Addresses table even when the Address fields are blank! How can I prevent any Address from being created, in situations where I ONLY want to create a new Employee with no Address. An example is when the user supplies an existing Address, then I wish to simply set the new Employee's AddressID to that of an existing physical address (I hope that makes sense). But it could apply to any situation where you need to create a new complex object, but you don't wish for LINQ to create any of its child complex objects. I have tried setting NewEmployee.Address = null after it is received in the controller, but even after that, a blank/new Address is still created. Even if I try NewEmployee.Address = SomeExistingAddress, it does correctly link the Employee to the existing Address, but it STILL goes off and creates another redundant new/blank address record! Which is really weird..
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Jan 5, 2011
I have a "Create New Employee" ASP.Net MVC form. My complex object is an Employee and an Employee has an Address, which is another Complex object. On my View/Form I collect all required values for both the Employee and the Address. I'm using the bound HTML helpers such as: Html.TextBoxFor(model => model.EmployeeAddress.StreetName)
AND
Html.TextBoxFor(model => model.NewEmployee.FirstName)
This is all working beautifully well. Model binding is working like a dream, both server side and client side validation using DataAnnotations is working beautifully well and I am nicely receiving my populated complex objects as expected in the Controller.. Now I'm trying to save.. The Employee should always be newly created, because its an "Add New Employee" form. But sometimes the Address is an existing Address and I don't want to insert another one. Rather, I just want to link the Employee to the existing AddressID of the one that already exists in the database.
So I wrote a nifty GetExistingOrCreateNewAddress(Address PostedAddress) method which works great so I end up with the correct Address to use and link to the about to be saved Employee object. This is all happening in the same DataContext, so no problems there..
BUT even when I link the about to be saved Employee object to an existing Address, on save a new/empty Address row is created in my Addresses table. Even though the newly created Employee does link correctly to the existing Address I told it to! Why is it so??? And how can I save the new Employee without LINQ automatically creating a blank Address for me. Because I'm explicitly specifying an existing Address it should be linked to instead!
[HttpPost]
public ActionResult CreateEmployee(EmployeeDetailsViewModel NewEmployeeDetails)
{
if (ModelState.IsValid)
{
EmployeeRepository ER = new EmployeeeRepository();
// Fetch or Create the appropriate Address object for what has been entered
Address ActualAddress = ER.GetExistingOrCreateNewAddress(NewEmployeeDetails.EnteredAddress);
// Link this Address to the "about to be saved" Employee
NewEmployeeDetails.Employee.Address = ActualAddress;
// Lock it in..
ER.SaveNewEmployee(NewEmployeeDetails.Employee);
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Sep 8, 2010
dynamic grid view loses binding when post back occurs ?
I have a dynamic grid View with template fields and bound fields as columns
for the first page load all binding looks fine.values are populated in all columns
when I trigger an event such as selected index changed in Drop downlist present in the column header(inside template field ) the binding are lost and the event is never catched.
how to retain controls when post back occurs and how to resolve this problem ?
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May 7, 2015
I have a hidden value field on a page. On submit I post to a different page. On the page I've posted to I do a Request.Form but I do not get the value just a null value. This is the initial page
<div id="booking_content_wrapper">
<form id="mainForm" name="mainForm" runat="server" action="Cancellation.aspx">
<h2>
Paid Bookings</h2>
<table cellpadding="0" cellspacing="0" border="0" id="booking_table">
<tr>
[code].....
The javascript ViewCancellation function is set to a hyperlink in the code behind. The function will have a value like this,<a href="#" onclick=" View Cancellation(54666);return false;">cancel</a>.
string sResID = "";
protected void Page_Load(object sender, EventArgs e) {
HttpContext context = HttpContext.Current;
sResID = context.Request.Form["ResID"] != null ? context.Request.Form["ResID"] : "";
sResID = Regex.Replace(sResID, "/[^A-Z]d-/g", "");
context.Response.Write(sResID);
}
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Feb 17, 2011
I have the following code and it`s pointing out errors as follows
Error 1 The name 'date' does not exist in the current context
Error 2 The name 'person' does not exist in the current context
What is wrong?
$("#test").Click(function () {
var date = $("#DateFrom").val();
var person = Model.SelectedPerson;
$.ajax({
url: '@Url.Action("testEmp","Employee",new {dateFrom = date, selectedPerson= person})',
type: 'GET',
contentType: "application/json; charset=utf-8",
dataType: "html",
success: function (result) {
$('#text).html(result);
},
});
return false;
});
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Nov 17, 2010
I Had two webforms. source.aspx & Target.aspxSuorce.aspx has 2 textboxes for input data and two submit buttons. am using cross page technique to transfer data from one webform to other.ource Page:On buton click event :
Server.Transfer("TargetHome.aspx");
= null)
{
TextBox TextBox1 = PreviousPage.FindControl("TextBox1") as TextBox;
if (TextBox1 != null)
[code]...
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Nov 30, 2010
I have four textbox and a button in my page. After filling the textbox. When the user click save button. A loading image should be displayed. User should not feel that the page is postback to the server,Some thing like in facebook loading image.
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Jul 14, 2010
Being new to ASP.NET I have run into trouble building my own Whack-a-mole program. I think my problem comes from using Buttons, which by themselves send post backs to the server, making the software unusable. The looks are in place, making new buttons show up in the grid, in different places by random. However, when a button is pushed - the score doesn't change (which I feel is strange).
Not so strange is that the Button doesn't work since it sends post back to the server - reloading the UpdatePanel. I think I should use a different controller like the CheckBox and style it hard using CSS (which isn't a problem). Is this the correct way to go, or should I make use of JavaScript AJAX instead?
Note to self: This technique shouldn't be used in a public application since it put too much unwanted pressure on the web server.
[code]...
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Apr 4, 2011
I have a custom server control (composite control having dynamically created dropdown boxes and textboxes). I have enabled AJAX in order to avoid page reload.The server control is used inside the ASP.NET webcontrol having few buttons which controls the visibility of the server control. Now I enter values in the dropdown box and texboxes and click on any other button. After this postback the last entered values are gone! The control is not remembering the values. How can I retain the values after post back?
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Oct 26, 2010
Im currently trying to use a jQuery plugin:jQuery Autocomplete TokenizerNow after posting back the page, I want to re-load the values back into the textbox for whatever items had been entered.Now the jQuery on the page is like below:
$(document).ready(function () {
$("#<%=txtPeople.ClientID %>").tokenInput("Handler.ashx", {
hintText: "Type in a name",
noResultsText: "No results",
searchingText: "Searching...",
[code]...
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Jan 22, 2010
i have a text box that i bind to my model data and it works fine. however when i submit my form in some cases i want to change the value that in the text box so some value i pull from the db. when i do this, it only works if the form was not submitted. is there something i am not aware of when it comes to rebinding a text box from the model in cases when the form was submited, instead of reloading the same value that the user entered into the text box?
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Sep 16, 2010
I have a post-only action that has a different route. In my form, I need to post to it, but also keep the querystring values I currently have.
Initial response: /my/first/path/?val1=hello
Needs to post to: /my/other/path/?val1=hello
It seems when I specify a route, it of course only returns the route and doesn't append the querystring values of my original page (for obvious reasons).Is it possible to cleanly append querystring values to my the action attribute of the form tag?
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Jun 28, 2010
I need to process surveys. I have modelled them in SQLServer, just need to generate the forms to input it.I have nested SqlDataSource/DataLists. The outer gets the questions and the inner gets the various options as a plain HTML radio buttons. I can't use ASP.NET radio buttons because of a bug with them inside itemtemplates not mutually exclusive http://support.microsoft.com/default.aspx?scid=kb;en-us;316495Anyway, so now I need to know the which radio buttons were selected so I can insert the values in the database. What is the best way of doing it?
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Jul 15, 2010
I searched google and found asynchronise post back trigger is used if we want update panel to post back on some event of control if it is out side the update panel. Than what is purpose of post back trigger ?
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Oct 4, 2010
I am using asp.net/c# application. In my application, I have a gridview.<asp:GridView id ="gv_QuestionList" runat="server"> </asp:GridView>In Code Behind, I created dynamic textboxes and DropDownLists on RowDataBound.
[Code]....
I have a Save button out side the gridview which stores all the row values into database. when I click the "Save" button, I lost dyanamically ceated controls like textbox,dropdown and values (on postback).How can i get all the dynamically created controls and values after the post back?
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Jun 28, 2010
For my project, i need to connect to a database who don't support ADO.net by using NHibernate
So, is it possible to make my own model who can be usable by the auto-creation of views of visual studio 2010 ?
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Feb 22, 2011
Using Vb.Net 2003 Asp.Net 1.1
I have a dynamic data bound drop down list, when the user selects thier selected item I have to use the autopostback feature.
Problem is: when the page comes back it is at the top of the page not where i have the control.
I don't really need it to focus back on the dropdownlist but to scroll to it, I want to do it in the code behind.
Any "New" ways to do it, I mean new as in code from like 2010 instead of old code from the early days.
I really don't want to use Page.Register new Script...... code if I can avoid it.
What would be cool is a ScrollToControl() Function for my code behind that worked but didn't register script.
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Feb 9, 2011
I have a very odd and disconcerning problem. Just recently a page where I have 1 textbox and a buttoon has ceased to work.
When I look at the post coming into the PageLoad, the pageType is "POST", but the Page.IsPostBack is false!! and the textbox (which had content) is empty.
I have stripped all AJAX script out, so I have a very vanilla page (in a master page) being served.
The pages is
[Code]....
[Code]....
The page is "POST", but isPostback is false[Code]....
[Code]....
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Dec 28, 2010
So, I've got an contact form in my MVC 2 application.
I'd like to programatically email all properties of my "ContactModel".
Here is what I'd like to do in psuedo-ish code:
[Code]....
In case it matters...ContactModel sets up the DisplayName attributes like this:
[DisplayName("First Name")]
public string FirstName {get; set ;}
I'd like to keep this nice and DRY by not repeating the DisplayName names.
Specifically, I'd like to enumerate over each property in my ContactModel, get its DisplayName, and get its submitted value.
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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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Apr 26, 2010
My test shows it doesn't work. It ignores the nested data in model.
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