I have a main model and a partial view. The model for the partial view is a new model with no values. But now I want to pass one element of parent model to the partial view. How do I go about it?
The parent and the partial views have different properties, so I cant use the same model.
Models:
public class Parent
{
.
.
public List<SelectListItem> TypeList { get; set; }
.
.
}
public class Partial1
{
public List<SelectListItem> TypeList1 { get; set; }
.
.
}
public class Partial2
{
public List<SelectListItem> TypeList2 { get; set; }
.
.
}
Parent View:
#model Models.Parent
#Html.Partial("_Partial1", new Partial1())
#Html.Partial("_Partial2", new Partial2())
I realize I can pass it to the partial view using a ViewDataDictionary and use it, but I was wondering if I could assign it to my partial view model directly. Can I do something like this?
#Html.Partial("_Partial1", new Partial1(new{TypeList1 =Model.TypeList}))
The above code gives a compile time error saying Partial1 does not contain a constructor that takes 1 argument.
EDIT 1:
According to Chris Pratt's answer I modified my code to
#Html.Partial("_Partial1", new Partial1{TypeList1 =Model.TypeList})
This solved the compilation error.But this is now causing a run time error in the partial View 1.
Partial1 View:
#model Models.Partial1
#Html.DropDownListFor(model => model.Type, Model.TypeList1, new { #class = "form-control" })
throws an error "There is no ViewData item of type 'IEnumerable' that has the key 'Type'."
Oh sorry. That code actually looked right on first glance, but now I see the issue. You're trying to pass the info as an anonymous object to the constructor, which is parameterless. Instead, you should be using the object initialization syntax:
new Partial1 { TypeList1 = Model.TypeList }
try using
#{
Html.RenderPartial("Partial1", new { param1 = model.property });
}
The MSDN Link.
Related
This question already has answers here:
The model item passed into the dictionary is of type .. but this dictionary requires a model item of type
(7 answers)
Closed 5 years ago.
I have a controller that takes in an instance of getbldgaddr_Result. I am trying to create a view that uses partials to put two separate viewmodels on the page. Below is the "Parent View"
#using DirectoryMVC.Models
#model Tuple<getbldgaddr_Result,getadministrators_Result>
#{
ViewBag.Title = "Central Office";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Central Office</h2>
<div class="row">
#*Display the getAddress view*#
#Html.Partial("_BuildingAddress", Model.Item1)
</div>
So above I am using Item1 from the model that is a getbldgaddr_Result. I have tried casting it to getbldgaddr_Result as well, but I get the below error.
The model item passed into the dictionary is of type 'System.Tuple`2[DirectoryMVC.Models.getbldgaddr_Result,DirectoryMVC.Models.getadministrators_Result]', but this dictionary requires a model item of type 'DirectoryMVC.Models.getbldgaddr_Result'.
The actual controller is...
public class BuildingAddressController : Controller
{
private DirectoryEntities de;
public BuildingAddressController()
{
de = new DirectoryEntities();
}
// GET: BldgAddr
public ActionResult BldgAddr(getbldgaddr_Result bldgres)
{
//getbldgaddr_Result bldgResult = de.getbldgaddr(district, bldg_no, null).FirstOrDefault();
return View(bldgres);
}
}
My guess is, I can have it take a tuple object as the parameter, but this seems counter intuitive. the Building Address, does not need anything in regards to administration.
Any thoughts?
Why send a Tuple back to the view? Just create a parent viewmodel having two child viewmodels—i.e. one for each item of the tuple—and return that from the controller instead.
Assuming a Tuple<Class1, Class2>, you could structure your viewmodel like this:
public class ParentViewModel
{
public Class1 ChildViewModel1 { get; set; }
public Class2 ChildViewModel2 { get; set; }
}
On the controller side, you'd simply do:
var parentViewModel = new ParentViewModel
{
ChildViewModel1 = Tuple.Item1,
ChildViewModel2 = Tuple.Item2
};
return View(parentViewModel);
Your view would then be:
#model ParentViewModel
// ...
#Html.Partial("_Partial1", Model.ChildViewModel1)
#Html.Partial("_Partial2", Model.ChildViewModel2)
Make sure that the Model.Item1 is not null. When the member/property you're passing in is null, MVC reverts back to the parent type.
I'm having an issue with the bindings of my model to a partial view and feel that there must be a way to do what I want. I wonder if my design is flawed and a small refactoring might be necessary.
A very simplified (and abstract) version of my models would be like so:
Public Class BaseClass
{
Public string Name { get; set; }
Public List<SomeClass> Things { get; set; }
}
Public Class DerivedClass : BaseClass
{
Public List<LineItem> Items { get; set; }
}
Public Class Library
{
Public List<LineItem> Items { get; set; }
}
Public Class LineItem
{
Public string Name { get; set; }
Public string Value { get; set; }
}
I have Editor Templates for the BaseClass, SomeClass, and LineItem. These are shown in the view for DerivedClass and work as intended by submitting changes to the controller. The LineItem template is wrapped in a LineItemList partial view because I intend to use it for a view for Library and don't want to repeat all of that layout and javascript. The LineItemList partial view is included on the DerivedClass view by Html.PartialView since there doesn't seem to be a way to create an Editor Template for the List type. So my views look like this:
DerivedClassView
BaseClassPartialView
SomeClassPartialView
LineItemListPartialView
LineItemParialView
When I submit my form, the controller gets all of the data for the BaseClass and SomeClass list but none for the LineItem list. The difference of course being that one is rendered using Html.EditorFor and the other Html.PartialView.
Refactoring the classes will be tough as they have to be backwards compatible with an old XML format for serialization, but I'm sure I can work some magic if necessary.
As Chris Pratt mentioned, I forgot to include my controller methods:
Public ActionResult DerivedClassEditor()
{
Return View(New DerivedClass());
}
[HttpPost]
Public ActionResult DerivedClassEditor(DerivedClass dc)
{
// Do Stuff
}
I just noticed in the rendered Html, the SomeClass controls are named SomeClass.[0].Name while those of the LineItem are [0].Name. I have a feeling that might be a symptom of the issue.
And my views look similar to this:
DerivedClassEditor
#model DerivedClass
#using (Html.BeginForm())
{
#Html.EditorFor(model => model)
#Html.Partial("LineItemListPartialView")
<input type="submit" />
}
LineItemListPartialView
#model List<LineItem>
<div name="Items">
#Html.EditorFor(model => model)
</div>
LineItemPartialView
#model LineItem
<div name="LineItem">
#Html.LabelFor(model => model.Name)
#Html.TextEditorFor(model => model.Name)
</div>
Edit:
A link to my view: https://github.com/melance/TheRandomizer/blob/Initial/TheRandomizer.WebApp/Views/UserContent/AssignmentEditor.cshtml
I've narrowed down the issue to the fact that when I load one of the lists using #Html.EditorFor it names the inputs Collection[index].Property yet when I add one dynamically using the same call it simply names the input Property. Is there an easy and reusable way to have the addition of new items have the same naming structure?
Crucially, you failed to post your controller code, so I'm stabbing in the dark, but I think I can guess pretty well what's happening. You most likely have something like:
[HttpPost]
public ActionResult MyAwesomeAction(BaseClass model)
{
...
}
And you're assuming that since your view is working with DerivedClass and posting DerivedClass that you should end up with an instance of DerivedClass rather than BaseClass in your action. That assumption is incorrect.
All that exists on post is a set of string key-value pairs. The modelbinder looks at the action signature and attempts to bind the posted data to an instance of the parameter(s), newing up classes as necessary. Given this, the only information the modelbinder has in this scenario is that it's expected to bind values to an instance of BaseClass and a set of data to attempt to do that with. As a result, it will create an instance of BaseClass and bind what data it can, dropping anything it can't. Importantly, since BaseClass doesn't include stuff like your Items property, all of that data will be discarded.
Long and short, polymorphism isn't supported with action parameters. The type of your parameter must be the type you want. Period.
For what it's worth, you can use editor templates for list properties. EditorFor will simply render the editor template for the contained type for each item in the list. For example, calling:
#Html.EditorFor(m => m.Items)
Is essentially the same as:
#for (var i = 0; i < Model.Items.Count(); i++)
{
#Html.EditorFor(m => m.Items[i])
}
So after much research, trial and error and help from Erik, I was able to solve my problem. The issue turned out to be the naming of the form elements in my partial view. When added by the model they are indexed as such: name = "ListProperty[Index].PropertyName". When I was adding my partial views using ajax, the were named for just the Property Name. In order to fix this, I had to handle my ajax calls for the partial view like this:
public ActionResult CreateParameter(Int32 index)
{
ViewData.TemplateInfo.HtmlFieldPrefix = $"Parameters[{index}]";
return PartialView("~/Views/Shared/EditorTemplates/Configuration.cshtml");
}
I have the following EF generated data model:
public partial class PrinterMapping
{
public string MTPrinterID { get; set; }
public string NTPrinterID { get; set; }
public string Active { get; set; }
}
I then have the following view model:
public class PrinterViewModel
{
public PrinterMapping PrinterMapping;
public Exceptions Exceptions;
public IEnumerable<PrinterMapping> Printers;
}
In my Index Action in HomeController I am passing my view model to the Index view.
private eFormsEntities db = new eFormsEntities();
public ActionResult Index()
{
PrinterViewModel printerModel = new PrinterViewModel();
printerModel.Printers = from pt in db.PrinterMapping select pt;
return View(printerModel);
}
My Index view is calling a partial view in the following manner towards the end (probably wrong):
#Html.Partial("~/Views/Home/GridView.cshtml")
My GridView.cshtml looks like:
#model AccessPrinterMapping.Models.PrinterViewModel
<h2> This is Where the Grid Will Show</h2>
#{
new WebGrid(#model.Printers, "");
}
#grid.GetHtml()
I learned about the WebGrid method from http://msdn.microsoft.com/en-us/magazine/hh288075.aspx.
My WebGrid line isn't happy at all since it doesn't recognize #model within that line.
How do I access the Printers in the view model that I passed in? Is this even possible?
Thanks very much to you all.
Theres two issues with your code.
First, you should explicitly pass your model in like this:
#Html.Partial("~/Views/Home/GridView.cshtml", Model) #* explicitly pass the model in *#
Then, because you are already in a code block in your partial view.. you don't need the # symbol.. and Model has an uppercase M.
new WebGrid(Model.Printers, "");
#model is a directive for your views/partial views. Think of it as a "configuration" command. Model is an actual property. It is the object that is passed into the view.. and is of the type you specified with the #model directive.
#{
new WebGrid(Model.Printers, "");
}
and also you have to pass your model into partial view in
#Html.Partial("~/Views/Home/GridView.cshtml")
in second parameter. I guess this call should be
#Html.Partial("~/Views/Home/GridView.cshtml", Model)
I have this Index.cshtml class:
#model ProOptInteractive.ViewModels.InvoicePageViewModel
#{
ViewBag.Title = "Index";
}
<div>#Html.Partial("ListServices", Model.Services)</div>
<div>#Html.Partial("ListProducts", Model.Products)</div>
<div>#Html.Partial("Invoice", Model.InvoiceViewModel)</div>
And this is my InvoicePageViewModel:
namespace ProOptInteractive.ViewModels
{
public class InvoicePageViewModel
{
public InvoiceViewModel InvoiceViewModel { get; set; }
public IEnumerable<Service> Services { get; set; }
public IEnumerable<Product> Products { get; set; }
}
}
The issue is that whenever I load this view, I get an error saying that I have passed the wrong model to the dictionary, and it doesn't specify which one of the partial views is causing the problem. Each partial has a different model type, one IEnumerable called Product, another IEnumerable called Service, and the Invoice partial view having a viewmodel called InvoiceViewModel.
Can anybody explain how to go about making this work? I'm a bit noob at Razor and MVC by the way.
UPDATE
I get this error message:
The model item passed into the dictionary is of type 'ProOptInteractive.ViewModels.InvoiceViewModel', but this dictionary requires a model item of type 'ProOptInteractive.ViewModels.InvoicePageViewModel'.
The error is because you have set your Invoice partial view to have a model of type InvoicePageViewModel, yet you are passing it a model of type InvoiceViewModel.
Either update your InvoiceViewModel property to be of type InvoicePageViewModel, or change the Invoice view to use a model of type InvoiceViewModel.
Error is in line <div>#Html.Partial("Invoice", Model.InvoiceViewModel)</div>
Your view Invoice is accepting model of type
InvoicePageViewModel and you are passing InvoiceViewModel
Change your code to <div>#Html.Partial("Invoice", Model)</div>
or modify your Invoice view to accept InvoiceViewModel as
#model ProOptInteractive.ViewModels.InvoiceViewModel
Invoice.cshtml likely starts with:
#model ProOptInteractive.ViewModels.InvoicePageViewModel
replace it with:
#model ProOptInteractive.ViewModels.InvoiceViewModel
You can pass model to your partial view like this:
#Html.Partial("Invoice", Model.InvoiceViewModel)
or something similar.
Model for main view:
class InvoicePageViewModel {
...
public InvoiceViewModel InvoiceViewModel { get; set; }
public IEnumerable<Service> Services { get; set; }
public IEnumerable<Product> Products { get; set; }
...
}
Then update your partial view to accept view model like this:
#model InvoiceViewModel
...
I discovered the error. It was lying in the controller method. When I called the Index view (which corresponds to the ActionResult Index method) I was returning the viewmodel InvoiceViewModel to the Index page, even though it was strongly typed to InvoicePageViewModel. I changed it to this, which works:
public ActionResult Index()
{
var invoice = InvoiceLogic.GetInvoice(this.HttpContext);
// Set up our ViewModel
var pageViewModel = new InvoicePageViewModel
{
Products = proent.Products.ToList(),
Services = proent.Services.ToList(),
InvoiceViewModel = new InvoiceViewModel
{
InvoiceItems = invoice.GetInvoiceItems(),
Clients = proent.Clients.ToList(),
InvoiceTotal = invoice.GetTotal()
}
};
// Return the view
return View(pageViewModel);
}
Thanks to everyone for all the help and suggestions.
I have a view model as such:
public class MyViewModel
{
public MyObject myObject{ get; set; }
public List<MyList> myList{ get; set; }
}
I have a view with a form strongly typed to MyViewModel
This view allows you to enter values for the properties of MyObject, as well as create a list of MyList objects. The List part works fine although I thought that would be the more difficult of the two.
Assuming MyObject has a property Description I create a textbox to enter the value as such:
#Html.EditorFor(x => x.myObject.Description);
The text box renders with an id of MyObject_Description...The problem is when I post this to my controller action, MyObject does not get bound at all(althought the list items do as they recieve the appropriate IDs of "MyViewModel_MyList[guid].myListValue")
What am I doing wrong here??
EDIT: more info
The first line of the view is:
#model MyApp.ViewModels.MyViewModel
And the Action method:
[HttpPost]
public ActionResult Create(MyViewModel myViewModel)
{
}
I am passing a new MyViewModel into the partial view to begin...
public ActionResult Create()
{
MyViewModel model = new MyViewModel();
return PartialView(model);
}
EDIT 2
Ok When I render my partial view that contains the forms I call :
#{Html.RenderAction("Create", "MyController");}
this is called from within a View of type #model IEnumerable<MyApp.Models.MyObject>
(this view displays a list of currently existing MyOjects, and at the bottom the partial is rendered to allow the user to add another MyObject to the DB)
If you are not already doing so, try creating a editor template (e.g., Views->Shared->EditorTemplates) called MyObject.cshtml. Move your partial view content to this view and then call
#Html.Editor("myObject").
from your parent partial view.
Change your ViewModel to have the Description directly
public class MyViewModel
{
public string Description { get; set; }
public List<MyList> myList{ get; set; }
}
then bind accordingly
#Html.EditorFor(x => x.Description);
I would expect the top line of your view to look something like this:
<%# Page Title="" Language="C#" Inherits="System.Web.Mvc.ViewPage<MyViewModel>" %>
This tells the view that the model it is supplied is of type MyViewModel (a la <T> style).
I don't think the out of the box model binding knows how to bind to complex objects. You're probably going to have to write up some sort of custom model binder.
I'm afraid it's not something I've done since MVC1 so I'm a bit hesitant to give you any sample code because the mechanism may well have changed completely since then. A quick google did turn up this article http://www.learnxpress.com/asp-net-mvc-hosting-6-tips-for-asp-net-mvc-model-binding-2.html and this article http://bradwilson.typepad.com/blog/2010/10/service-location-pt9-model-binders.html.
Edit: I've just seen this answer which might help Retrieving data from view, should I use model binder?