Step 1:
I'm using a dropdown to display company locations. The list comes from the Location table.
Step 2:
While the user is registering, the dropdown list will show the locations in question.
When the user selects India, then this value (Location Name) should store in the UserLogin Table.
How can I read the value from the dropdown in ASP.Net MVC 3?
Create a ViewModel for your form
public class CompanyViewModel
{
public int CompanyId { set;get;}
// Other properties of Company
public int SelectedLocationId { set;get;}
public IEnumerable<Location> Locations { set;get;}
}
Assuming you have a Location class like this
public class Location
{
public int Id { set;get;}
public string Name { set;get;}
}
In the Register (HTTPGET) Action method, Return a CompanyViewModel object with Locations filled from database to the View
public ActionReuslt Register()
{
CompanyViewModel model=new CompanyViewModel();
model.Locations =myRepositary.GetAllLocations();
return View(model);
}
Assuming GetAllLocations returns a list of Location objects from your repositary.
And in the Register View which is strongly typed to CompanyViewModel
@model CompanyViewModel
@using(Html.BeginForm())
{
@Html.DropDownListFor(x=>x.SelectedLocationId,
new SelectList(Model.Locations ,"Id",
"Name"),"Select Location")
<input type="submit" value="Save" />
}
Now write an HTTPPost actionmethod to handle the form post(when user submits the form)
[HttpPost]
public ActionResult Register(CompanyViewModel model)
{
if(ModelState.IsValid)
{
// You will have selected Location id available in model.SelectedLocationId property now
//Save and redirect.
}
//Model Validation failed. so Let us reload the locations again
//because HTTP is stateless and ASP.NET MVC is true to HTTP ! :)
model.Locations =myRepositary.GetAllLocations();
return View(model);
}
Here is some sample code that you can modify and use in your scenario. I don't know what your code looks like so I created my own.
In your view:
@model YourProject.ViewModels.YourViewModel
Your locations dropdown:
<td><b>Location:</b></td>
<td>
@Html.DropDownListFor(
x => x.LocationId,
new SelectList(Model.Locations, "Id", "Name", Model.LocationId),
"-- Select --"
)
@Html.ValidationMessageFor(x => x.LocationId)
</td>
Your view model:
public class YourViewModel
{
// Partial class
public int LocationId { get; set; }
public IEnumerable<Location> Locations { get; set; }
}
Your create action method:
public ActionResult Create()
{
YourViewModel viewModel = new YourViewModel
{
// Get all the locations from the database
Locations = locationService.FindAll().Where(x => x.IsActive)
}
// Return the view model to the view
// Always use a view model for your data
return View(viewModel);
}
[HttpPost]
public ActionResult Create(YourViewModel viewModel)
{
if (!ModelState.IsValid)
{
viewModel.Locations = locationService.FindAll().Where(x => x.IsActive);
return View(viewModel);
}
// If you browse the values of viewModel you will see that LocationId will have the
// value (unique identifier of location) already set. Now that you have this value
// you can do with it whatever you like.
}
Your location class:
public class Location
{
public int Id { get; set; }
public string Name { get; set; }
public bool IsActive { get; set; }
}
This is simple as can come. I hope this helps :)
UPDATE:
My service layer is there for any further business logic and then it calls my repository layer to get the data from the database. I use Entity Framework code first. I also use Autofac for my IoC container.
Your service layer:
public class LocationService : ILocationService
{
private readonly ILocationRepository locationRepository;
public LocationService(ILocationRepository locationRepository)
{
this.locationRepository = locationRepository;
}
public IEnumerable<Location> FindAll()
{
return locationRepository.FindAll();
}
}
And your repository:
public class LocationRepository : ILocationRepository
{
YourDbContext db = new YourDbContext();
public IEnumerable<Location> FindAll()
{
return db.Locations.OrderBy(x => x.Name);
}
}
Your database context class:
public class YourDbContext : DbContext
{
public DbSet<Location> Locations { get; set; }
}
It depends how you are getting values of your form if you are passing formcollection then simply you can access its value by this
public ActionResult MyAction (FormCollection form)
{
string value = form["DropDownListName"];
}
Or you can access it through
string value = Request.Form["DropDownListName"];
