Does anyone know how to deal with Dropdowns in Asp.net core. I think I made myself very complicated to understand the new Asp.net core concept. (I am new to Asp.net Core).
I have models called Driver
, Vehicle
. Basically one can create bunch of vehicles in the master then attach it to the Driver. So that the driver will be associated with a vehicle.
My problem is that I am also using viewmodel in some area to combine two different models.(understood little from default template)
My problem is I have no idea what is the next step since ASP.net Core is very latest, there are not a lot of tutorials and Q/As available.
Driver Model
public class Driver
{
[Required]
public int Id { get; set; }
[Required]
public string ApplicationUserId { get; set; }
[Required]
public int VehicleId { get; set; }
[Required]
public string Status { get; set; }
public virtual ApplicationUser ApplicationUser { get; set; }
public virtual Vehicle Vehicle { get; set; }
}
Vehicle Model
public class Vehicle
{
[Required]
public int Id { get; set; }
[Required]
public string Make { get; set; }
public string Model { get; set; }
[Required]
public string PlateNo { get; set; }
public string InsuranceNo { get; set; }
}
ViewModel of Driver
public class DriverViewModel
{
[Required]
[Display(Name = "ID")]
public int ID { get; set; }
[Required]
[Display(Name = "User ID")]
public string ApplicationUserId { get; set; }
[Required]
[Display(Name = "Vehicle ID")]
public IEnumerable<Vehicle> VehicleId { get; set; }
//public string VehicleId { get; set; }
[Required]
[Display(Name = "Status")]
public string Status { get; set; }
}
Here is my View
<div class="col-md-10">
@*<input asp-for="VehicleId" class="form-control" />*@
@Html.DropDownList("VehicleId", null, htmlAttributes: new { @class = "form-control"})
<span asp-validation-for="VehicleId" class="text-danger" />
</div>
Looking at the documentation it appears that asp.net core may be moving away from HTML helpers and towards the use of tag helpers. The following link should help
https://docs.asp.net/en/latest/mvc/views/working-with-forms.html#the-select-tag-helper
specifically
@model CountryViewModel
<form asp-controller="Home" asp-action="Index" method="post">
<select asp-for="Country" asp-items="Model.Countries"></select>
<br /><button type="submit">Register</button>
</form>
Note the use of "asp-for" which references the Model attribute to bind and the use of "asp-items" which references the model attribute source for the List of Select List items and how it is applied to the select tag
The sample model used in the documentation is referenced below for completeness
namespace FormsTagHelper.ViewModels
{
public class CountryViewModel
{
public string Country { get; set; }
public List<SelectListItem> Countries { get; } = new List<SelectListItem>
{
new SelectListItem { Value = "MX", Text = "Mexico" },
new SelectListItem { Value = "CA", Text = "Canada" },
new SelectListItem { Value = "US", Text = "USA" },
};
}
}
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