public class Encapsulated
{
[Required]
public string CategoryId { get; set; }
}
public class Category
{
public string ID { get; set; }
public string CategoryName { get; set; }
}
public class Test
{
public Encapsulated encapsulated { get; set; }
private IEnumerable<Category> categories;
public IEnumerable<Category> Categories
{
get { return
new List<Category>{new Category{ID="1",CategoryName="abc"}}; }
set { categories = value; }
}
}
#using (Ajax.BeginForm(new AjaxOptions { HttpMethod = "Post" }))
{
#Html.DropDownListFor(
x => x.encapsulated.CategoryId,
new SelectList(Model.Categories, "ID", "CategoryName"),
"-- Please select a category --"
)
#Html.ValidationMessageFor(x => x.encapsulated.CategoryId)
<input type="submit" value="Submit Form" />
}}
Why doesn't client validation work on dropDownList. If I place
[Required]
public string CategoryId { get; set; }
directly inside my Test class and change the view to
#Html.DropDownListFor( x => x.CategoryId,
new SelectList(Model.Categories, "ID", "CategoryName"), "-- Please select a category --" ) #Html.ValidationMessageFor(x => x.CategoryId)
client side validation starts working...
Related
I am trying to pass the dropdownlist value to my controller so I can add the values to a list of paycodes but I keep getting a "Value cannot be null." error. My paycode list has many items in it. Not sure what is null or wrong here...
INNER EXCEPTION
Value cannot be null.
Parameter name: source
VIEW
<!-- products input-->
<div class="control-group col-lg-6">
<label class="control-label">Product</label>
<div class="controls">
#using (Ajax.BeginForm("AddPayCode", "Referral",
new AjaxOptions()
{
HttpMethod = "POST",
InsertionMode = InsertionMode.Replace,
UpdateTargetId = "PayCodes",
Url = Url.Action("AddPayCode", "Referral")
}))
{
#Html.ValidationSummary()
#Html.DropDownListFor(model => model.SelectedPayCode, new SelectList(Model.PayCodes.ToList(), "Id", "Description"), "- Select -")
<input type="submit" value="Add" />
}
</div>
</div>
CONTROLLER
[HttpPost]
public void AddPayCode(ReferralModel model)
{
var test = model.SelectedPayCode;
//TODO: Add to model.Referral.PayCodes list and return list of selected items
}
MODEL
public class ReferralModel
{
public Customer Customer { get; set; }
public Employee Employee { get; set; }
public List<PayCode> PayCodes { get; set; }
public int SelectedPayCode { get; set; }
public Referral Referral { get; set; }
}
DOMAIN OBJECT
public class Referral
{
[Key]
public int Id { get; set; }
public int CustomerId { get; set; }
public int EmployeeId { get; set; }
public decimal Total { get; set; }
public virtual List<PayCode> PayCodes { get; set; }
public virtual Customer Customer { get; set; }
public virtual Employee Employee { get; set; }
}
Objective :
User chooses a paycode from the dropdown and clicks "Add" Paycode is
added to the referral PayCodes list
Controller returns the list of paycodes selected to the view (not
yet implemented)
The issue was the controller is missing the property of the dropdown list.
[HttpPost]
public void AddPayCode(ReferralModel model, ** string SelectedPayCode ** <-- missing)
{
var test = SelectedPayCode;
//TODO: Add to model.Referral.PayCodes list and return list of selected items
}
i am trying to generate radio button from model but getting object reference error. i just can not understand where i am making mistake in MVC because i am just learning it. here is my full code. please have a look and tell me where is the mistake. thanks
model class
public class StudentModel
{
[Required(ErrorMessage = "First Name Required")] // textboxes will show
[Display(Name = "First Name :")]
[StringLength(5, ErrorMessage = "First Name cannot be longer than 5 characters.")]
public string FirstName { get; set; }
[Required(ErrorMessage = "Last Name Required")] // textboxes will show
[Display(Name = "Last Name :")]
[StringLength(5, ErrorMessage = "Last Name cannot be longer than 5 characters.")]
public string LastName { get; set; }
[Required(ErrorMessage = "Sex Required")]
[Display(Name = "Sex :")]
public int SexID { get; set; }
public List<Sex> Sex { get; set; }
}
public class Sex
{
public string ID { get; set; }
public string Type { get; set; }
}
controller class
public class HomeController : Controller
{
[HttpGet]
public ActionResult Index()
{
ViewBag.Message = "Welcome to ASP.NET MVC!";
var student = new StudentModel
{
FirstName = "Rion",
LastName = "Gomes",
//I think the best way to populate this list is to call a service here.
Sex = new List<Sex>
{
new Sex{ID="1" , Type = "Male"},
new Sex{ID="2" , Type = "Female"}
}
};
return View();
}
[HttpPost]
public ActionResult Index(StudentModel model)
{
if (ModelState.IsValid)
{
//TODO: Save your model and redirect
}
//Call the same service to initialize your model again (cause we didn't post the list of sexs)
return View(model);
}
}
view code
#model MvcRadioButton.Models.StudentModel
#Html.BeginForm()
{
<div>
#Html.LabelFor(model => model.FirstName)
#Html.EditorFor(model => model.FirstName)
#Html.ValidationMessageFor(model => model.FirstName)
</div>
<div>
#Html.LabelFor(model => model.LastName)
#Html.EditorFor(model => model.LastName)
#Html.ValidationMessageFor(model => model.LastName)
</div>
#{
foreach (var sex in Model.Sex)
{
<div>
#Html.RadioButtonFor(model => model.Sex, new { id = "sex" + sex.ID })
#Html.Label("sex" + sex.ID, sex.Type)
</div>
}
}
<input type="submit" value="Submit" />
}
this line throwing error
foreach (var sex in Model.Sex) saying model null or object reference error
You never return a model to your view when the page is initially served. As a result, when you try to iterate over the Sex object you get the null reference error.
[HttpGet]
public ActionResult Index()
{
... code ...
return View(); //The problem is here!
}
You should be returning a model to your view:
[HttpGet]
public ActionResult Index()
{
... code ...
return View(student);
}
I am trying to create an Item that has an ItemType coming from another table. I am unable to get back the actual Type object from the Create page. This is the code I have tried:
Models:
public class ItemType {
public int Id { get; set; }
[Required]
public string Name { get; set; }
public virtual ICollection<Item> Item{ get; set; }
}
public class Item {
public int Id { get; set; }
[Required]
public string Name { get; set; }
public virtual ItemType ItemType { get; set; }
}
In the ItemController, this is my create code:
public ActionResult Create() {
var itemTypeRepo = new ItemTypeRepository(context);
ViewBag.ItemTypes = new SelectList(itemTypeRepo.GetAll(), "ID", "Name");
return View();
}
[HttpPost]
public ActionResult Create(Item item) {
if (ModelState.IsValid) {
context.Items.Add(item);
context.SaveChanges();
return RedirectToAction("Index");
}
return View(item);
}
In my Create.cshtml view I have tried:
<div class="editor-field">
#Html.DropDownList("ItemType", String.Empty)
#Html.ValidationMessageFor(model => model.ItemType)
</div>
This returns no value at all and throws an error "The value 'X' is invalid." Where X is the ID of the ItemType I selected.
And
<div class="editor-field">
#Html.DropDownListFor(x => x.ItemType.Id, (SelectList)ViewBag.ItemType)
#Html.ValidationMessageFor(model => model.ItemType)
</div>
This creates a stub ItemType object with the correct ID but does not insert it into the database since the object is not fully loaded. If I look at ModelState object, I find that there is an error that the Name field is missing from ItemType object.
I also attempted to solve the problem using the second .cshtml code and adding this code:
public ActionResult Create(Item item) {
item.ItemType = context.ItemTypes.Find(item.ItemType.Id);
if (ModelState.IsValid)
This does not change the value of ModelState.IsValid from false even through it should.
What do I need to do to get this to work?
You should add a property ItemTypeId to your Item entity so that it acts as a foreign key.
public class Item
{
public int Id { get; set; }
[Required]
public string Name { get; set; }
public int ItemTypeId { get; set; }
[ForeignKey("ItemTypeId")]
public virtual ItemType ItemType { get; set; }
}
You can then use that property for the dropdownlist:
<div class="editor-field">
#Html.DropDownListFor(x => x.ItemTypeId, (SelectList)ViewBag.ItemType)
#Html.ValidationMessageFor(model => model.ItemType)
</div>
how I can make the WebGrid as appears in the picture and get the selected row with the rariobutton
Blessings
Try this
myGrid.Column(header: "Select", format: #<text><input name="chck"
TYPE="RADIO" CHECKED="#item.select" /></text>),
Also check this link http://fiddle.jshell.net/Gt4GH/
This is not a compiled code, try this and let me know if it works :)
You could define view models:
public class UserViewModel
{
public int Id { get; set; }
public string Email { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
}
public class MyViewModel
{
public int? SelectedUserId { get; set; }
public IEnumerable<UserViewModel> Users { get; set; }
}
then a controller:
public class HomeController : Controller
{
public ActionResult Index()
{
var users = Enumerable.Range(1, 5).Select(x => new UserViewModel
{
Id = x,
Email = "email " + x,
FirstName = "fn " + x,
LastName = "ln " + x,
});
var model = new MyViewModel
{
Users = users
};
return View(model);
}
[HttpPost]
public ActionResult Index(int? selectedUserId)
{
return Content(string.Format("Thank you for selecting user id: {0}", selectedUserId));
}
}
and finally a view:
#model MyViewModel
#{
var grid = new WebGrid(Model.Users);
}
#using (Html.BeginForm())
{
#grid.GetHtml(
columns: grid.Columns(
grid.Column(
header: "Select",
format: #<text>#Html.RadioButtonFor(x => x.SelectedUserId, (int)item.Id)</text>
),
grid.Column("Email"),
grid.Column("FirstName", "First Name"),
grid.Column("LastName", "Last Name")
)
)
<button type="submit">OK</button>
}
I am trying to use dropdownList with two foreign keys which are modelId, and categoryId.
And I am using ViewBag with selectList.
public ActionResult Create()
{
ViewBag.categoryId = new SelectList(db.Category, "categoryId", "name");
ViewBag.modelId = new SelectList(db.Model, "modelId", "name");
return View();
}
//
// POST: /Product/Create
[HttpPost]
public ActionResult Create(Product product)
{
if (ModelState.IsValid)
{
db.Product.Add(product);
db.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.categoryId = new SelectList(db.Category, "categoryId", "name", product.categoryId);
ViewBag.modelId = new SelectList(db.Model, "modelId", "name", product.modelId);
return View(product);
}
And here is my Create.cshtml.
<div class="editor-label">
#Html.LabelFor(model => model.Category)
</div>
<div class="editor-field">
#Html.DropDownList("categoryId", "--Select--")
</div>
<div class="editor-label">
#Html.LabelFor(model => model.Model)
</div>
<div class="editor-field">
#Html.DropDownList("modelId", "--Select--")
</div>
When I press submit button, error come up,
'An item with the same key has already been added'
What is problem? Is it problem with in Model?
Here is my models.
--Prodruct.cs--
public class Product
{
[Key] public int productId { get; set; }
[Required(ErrorMessage = "Please select category")]
public int categoryId { get; set; }
[Required(ErrorMessage = "Please select model")]
public int modelId { get; set; }
[DisplayName("Model name")]
public String model { get; set; }
public virtual Category Category { get; set; }
public virtual Model Model { get; set; }
}
--Category.cs--
public class Category
{
[Key] public int categoryId { get; set; }
public String name { get; set; }
}
--Model.cs--
public class Model
{
[Key] public int modelId { get; set; }
public String name { get; set; }
}
--RentalDB.cs--
public class rentalDB : DbContext
{
public DbSet<Product> Product { get; set; }
public DbSet<Model> Model { get; set; }
public DbSet<Customer> Customer { get; set; }
public DbSet<Order> Order { get; set; }
public DbSet<Cart> Cart { get; set; }
public DbSet<Category> Category { get; set; }
public DbSet<OrderDetails> OrderDetails { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
}
}
Where it is wrong? Index page in Create can get category data and model data. However, when I submit it, it has error, 'An item with the same key has already been added'.
Could you help me where has got problem?
Thank you.
--added more coding--
I am using this LINQ. Probably here has problem.
How can I add 'Model' entity in here?
var product = from a in db.Product.Include(a => a.Category)
select a;
This is how I would have done it..
I would suggest that you don't send your domain models to the view, but rather create a view model for each view. Doing it this way you will only include what is needed on the screen.
Create a new view model for your Create view:
public class ProductCreateViewModel
{
// Include other properties if needed, these are just for demo purposes
public string Name { get; set; }
public string SKU { get; set; }
public string LongDescription { get; set; }
// This is the unique identifier of your category,
// i.e. foreign key in your product table
public int CategoryId { get; set; }
// This is a list of all your categories populated from your category table
public IEnumerable<Category> Categories { get; set; }
// This is the unique identifier of your model,
// i.e. foreign key in your product table
public int ModelId { get; set; }
// This is a list of all your models populated from your model table
public IEnumerable<Model> Models { get; set; }
}
Category class:
public class Category
{
public int Id { get; set; }
public string Name { get; set; }
}
Model class:
public class Model
{
public int Id { get; set; }
public string Name { get; set; }
}
In your Create view you would have the following:
#model MyProject.ViewModels.ProductCreateViewModel
#using (Html.BeginForm())
{
<table>
<tr>
<td><b>Category:</b></td>
<td>
#Html.DropDownListFor(x => x.CategoryId,
new SelectList(Model.Categories, "Id", "Name", Model.CategoryId),
"-- Select --"
)
#Html.ValidationMessageFor(x => x.CategoryId)
</td>
</tr>
<tr>
<td><b>Model:</b></td>
<td>
#Html.DropDownListFor(x => x.ModelId,
new SelectList(Model.Models, "Id", "Name", Model.ModelId),
"-- Select --"
)
#Html.ValidationMessageFor(x => x.ModelId)
</td>
</tr>
</table>
<!-- Add other HTML controls if required and your submit button -->
}
Your Create action methods:
public ActionResult Create()
{
ProductCreateViewModel viewModel = new ProductCreateViewModel
{
// Here you do database calls to populate your dropdowns
Categories = categoryService.GetAllCategories(),
Models = modelService.GetAllModels()
};
return View(viewModel);
}
[HttpPost]
public ActionResult Create(ProductCreateViewModel viewModel)
{
// Check that viewModel is not null
if (!ModelState.IsValid)
{
viewModel.Categories = categoryService.GetAllCategories();
viewModel.Models = modelService.GetAllModels();
return View(viewModel);
}
// Mapping
Product product = ... // Do your mapping here
// Insert product in database
productService.Insert(product);
// Return the view where you need to be
}
I would also recommend that you use AutoMapper to do the mappings for you between your domain model and view model. I would also recommend that you look at Fluent Validation to take care of your view model validations.
I hope this helps.
UPDATED ANSWER
The service that was used to get all the categories could look like this:
public class CategoryService : ICategoryService
{
private readonly ICategoryRepository categoryRepository;
public CategoryService(ICategoryRepository categoryRepository)
{
// Check if category repository is not null, throw exception if it is
this.categoryRepository = categoryRepository;
}
public IEnumerable<Category> GetAllCategories()
{
return categoryRepository.GetAllCategories();
}
}
categoryRepository is injected by Autofac.
Category service interface:
public interface ICategoryService
{
IEnumerable<Category> GetAllCategories();
}
I currently still use Entity Framework 4.1 code first.
My category repository:
public class CategoryRepository : ICategoryRepository
{
MyContext db = new MyContext();
public IEnumerable<Category> GetAllCategories()
{
return db.Categories
.OrderBy(x => x.Name);
}
}
My category repository interface:
public interface ICategoryRepository
{
IEnumerable<Category> GetAllCategories()
}
public class Test
{
rentalDB db = new rentalDB();
public Product LoadProductById(int pId)
{
return db.Products.Include(p => p.Model).Include(p => p.Category).Where(p => p.productId == pId).SingleOrDefault();
} // To get specific product.
public IEnumerable<Product> LoadAllProducts()
{
return db.Products.Include(p => p.Model).Include(p => p.Category).ToList();
} // To get all products.
}
I have changed your DbSet to Products make it more clear. This is how you load all the references for one product or all products, in order to iterate over them.