Does Model Binding With A Selectlist Work?
Jan 5, 2011
I'm having problems retrieving the values of a selectlist in my form collection. I've tried making a viewmodel with an attribute with the same name as the select list.
I'm honestly just realizing I REALLY don't understand how model binding works with selectlists. I've just been assuming that the following conventions apply:
Name the select list the same thing as the attribute on the model you want it to bind to. Apart from that, I really don't get it. I've looked at several books on it and they're useless frankly. How does a select list work with a) form collection and b) a particular model?
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Feb 23, 2010
i'm just sending a normal POST request using Ajax.BeginForm... i output the form elements using the .TextBoxFor and .HiddenFor etc... all as i should... and when it's posted via ajax to my action method, the object in the action method (named "Comment") is not populated with the values!
Am i missing something? here is the relevant part of my code to those who want to see it...
[code]....
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Jan 14, 2010
What do I use to set the dataValueField of the Select List when I'm using a list of strings. I want to be able to set the value of the option in the select. If i have:
List<string> list = new List<string>();
list.Add("apple");
list.Add("orange");
and I want my html to be:
<select>
<option value="apple">apple</option>
<option value="orange">orange</option>
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Aug 20, 2010
why SelectList dont have a default constructor new SelectList()
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Jun 14, 2010
This seems like the model binding is causing me issues.Essentially I have a model called ProductOption and for the purpose of this question it has 2 fields
ID (Int) PK
ProductID (Int) FK
I have a standard route set-up
context.MapRoute(
"Product_default",
"Product/{controller}/{action}/{id}",
[code]...
This is used to determine (on submit) if we are editing or adding a new option. However the Model binder in .net seems to replace .ID (Which was 0 when leaving the above get actionresult) with 1 (or the value of the id parameter in the URL)How can I stop or work around this?
ViewModel
public class ProductExtraModel
{
//Database
public int ID { get; set; }
public string Name { get; set; }
public int ProductID { get; set; }
public ProductModel Product { get; set; }
}
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Dec 14, 2010
Have been able to get a really strange behavior in mvc 3 rc 2, where an controller action (a) in an area has a nullable enum and long as parameter and an controller action (b) (which is not placed in an area) only have nullable long.
If I compile and first surf to (a) then it works, and then surf to (b) with a number as parameter it throws exception where it seem to have tried to pass the nullable enum!
If I recompile and surf to (b) with same parameter it works, and if I surf to (a) the enum is always null.
Edit: perhaps this is a model binding bug, perhaps caused by some internal cache? Since the routes are correct but the passed arguments are not.
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Apr 15, 2010
I have just upgraded to MVC 2.0 and I have noticed a difference in the model binding when posting a form back to an action. In MVC 1.0 if I had a posted a blank form back to my action and then looked at the populated model class my empty string values would show as empty strings, in MVC 2.0 doing the same thing and then looking at my model class shows my empty string values as null, why has this changed?
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Feb 6, 2010
I am experimenting with using xml as a database for small CMS, like gallery or staff profiles etc
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{
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[Code]....
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May 6, 2010
I've got a very complex form and i'm using the MVC model binding to capture all the information
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[code]....
The html for the image button then looks like
<input type="image" id="ViewDataObject_ImageButton" name="ViewDataObject.ImageButton" />
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When i debug it in chrome, the Request.Form object contains the values that i would expect, but after the model binding has occurred, the ImageButton property on the ViewDataObject has been set to null
The only difference that i can see between the submission values is that Chrome passes the x as lower case (ViewDataObject.ImageButton.x) and IE passes it as upper case (ViewDataObject.ImageButton.X) but i didn't think that model binding took any notice of casing on property names.
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Apr 29, 2010
I am trying set up a simple dropdown list but I dont seem to be able to get it to bind to the Model. I am using Asp.Net MVC and nhibernate.
My dropdown list is declared like so:
<%= Html.DropDownListFor(model => model.Project, (IEnumerable<SelectListItem>)ViewData["Projects"], " -- Select -- ", new { name = "Project" })%>
I set up the select list like so:
ViewData["Projects"] = new SelectList(projectRepository.GetAll(), "EntityGUID", "Name", editEntity.Project);
This seems to bind the select list to the Dropdown fine, but the SelectedValue is not set.
it shows up as the default --- Select ---
Also when I save this data, the dropdown does not bind to the model, I have to manually set the object like so to save it:
entity.Project = projectRepository.GetById(new Guid(Request["Project"].ToString()));
I believe I have take the correct messures to have this item bind directly to my model. Is there something I am missing here?
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Feb 3, 2010
I am working on the example from Steven Sanderson's book 'Pro ASP.NET MVC Framework'. The cart class is coming up as empty in my Index action method of CartController class.
[Code]....
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Apr 16, 2010
I have a textbox that I am defining as
<%= Html.TextBox("Username", Model.Form.Username,
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In my action
[AcceptVerbs(HttpVerbs.Post)]
[ValidateAntiForgeryToken]
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return View(model);
}
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Nov 24, 2010
I would like to create a custom action filter attribute that adds a value in the HttpContext items that would be accessible during model binding.
I have tried to add it in the OnActionExecuting but it that seems the modelbinding is exectued before the filter. Maybe there's a method in the modelbinder that I could override that will be fired after the filter and use the value injected by my filter.
What I want to do, is to inject a validation context (the library I use for validation supports context, it is nvalid.net (www.nvalid.net) I would like to be able to place an attribute such as
[ValidationContext("Prevalidation")]
on my actionresult method, so that the validation that occurs in my custom model binder could know which context to use when doing the Validation. That's why I can't simply make a custom model binder.
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Mar 2, 2010
I am working with ASP. net MVC project. There is File upload functionality to be implemented in the project. I am able to show the upload control using input-file. But I am not able to show defalut value (file with path) in text area using model binding.
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what I have in view is this
<input type="file" name="fileupload1" id="fileupload1" />
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Nov 2, 2010
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How can I override this behaviour on certain properties (preferably using attributes on the View Model itself)?
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[Code]....
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I have a HTMLHelper Extension for the DatePicker:
[Code]....
Inside my view it looks like this: (code snippet)
[Code]....
My action method in my controller:
[Code]....
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}
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Nov 7, 2010
I saw a post with posibble problems with Model Binding which is mentioned here. [URL]. Whats the best approach to this? Different approaches are below.
[Code]....
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[Code]....
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