I am a solo and very beginner learner. I am trying to create a simple code first app with a database using EF6. I cannot understand how to insert the data of a entity inside another by the frontend.
I have two entities:
public class Movie
{
[Key]
public int Id { get; set; }
public string Title{ get; set; }
public int ActorId { get; set; }
public ICollection<Actor> Actors { get; set; }
}
public class Actor
{
[Key]
public int Id { get; set; }
public string Name { get; set; }
[ForeignKey("MovieId")]
public ICollection<Movie> Movies { get; set; }
}
The controller.
public ActionResult AddMovie()
{
var actorsList = (from Name in ctx.Attors select Name).ToList();
ViewBag.Actors = new SelectList(actorsList, "Name", "Name");
return View(new Film());
}
[HttpPost]
public ActionResult PerformAddMovie(Movie m)
{
try
{
ctx.Movies.Add(m);
ctx.SaveChanges();
return RedirectToAction("Index", "Home");
}
catch(Exception ex)
{
ModelState.AddModelError("", ex.Message);
}
return RedirectToAction("Index", "Home");
}
#model Cinema.Models.Movie
#{
ViewBag.Title = "AddMovie";
}
<h2>AddFilm</h2>
#{
var list = ViewBag.Actors as SelectList;
}
#using (Html.BeginForm("PerformAddMovie", "Movie", FormMethod.Post))
{
#Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>Film</h4>
<hr />
#Html.ValidationSummary(true, "", new { #class = "text-danger" })
<div class="form-group">
#Html.LabelFor(model => model.Title, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.Title, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.Title, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.ActorId, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.ActorId, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.ActorId, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.Actors, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.DropDownListFor(m => m.Actors, list, "---Select---", new { #class = "form-control" })
#Html.ValidationMessageFor(model => model.Actors, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</div>
</div>
}
<div>
#Html.ActionLink("Back to List", "Index")
</div>
#section Scripts {
#Scripts.Render("~/bundles/jqueryval")
}
After adding some movies into the database by the frontend web page, in the addmovie web page I can select one of them by the dropdown list, but when I save the movie nothing happens inside the third table created with movieid and actorid, it is always empty.
What am I doing wrong?
The Model is wrong
public class Movie
{
[Key]
public int Id { get; set; }
public string Title{ get; set; }
public int ActorId { get; set; }
public virtual Actor Actor { get; set; } // It should be one to one relationship
}
public class Actor
{
[Key]
public int Id { get; set; }
public string Name { get; set; }
//[ForeignKey("MovieId")] This is unneccessary
public ICollection<Movie> Movies { get; set; }
}
Then u can select the Actor Id as key while display actor name in the select list
ViewBag.Actors = new SelectList((from s in db.Actor
select new {Id = s.Id, Name = s.Name }),
"Id", "Name");
Remove this under your html as the Id is attached to the dropdown list
<div class="form-group">
#Html.LabelFor(model => model.ActorId, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.ActorId, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.ActorId, "", new { #class = "text-danger" })
</div>
</div>
change the dropdownlist to this
<div class="form-group">
#Html.LabelFor(model => model.ActorId, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.DropDownListFor(m => m.ActorId, (Selectlist)ViewBag.Actor, "---Select---", new { #class = "form-control" })
#Html.ValidationMessageFor(model => model.ActorId, "", new { #class = "text-danger" })
</div>
</div>
I have PROPERTY VM which contains List<FounderInvestmentViewModel>.I have successfully inserted the partial view of FounderInvestmentViewModel into the Main Create Property view.
FounderInvestmentViewModel in turn contains List<InstallmentDetailsViewModel>. I have created the Partial View for InstallmentDetailsViewModel as _InstallmentDetails.cshtml and all the necessary actions.
I want to insert the _InstallmentDetails.cshtml into the partial view of FounderInvestmentViewModel which is in turn inserted into the Main View.
First let us take a look at the codes that I have used so far :--
Property View Model:-
public class PropertyViewModel
{
public int? Id { get; set; }
public string PropertyTitle { get; set; }
....other attributes....
public List<FounderInvestmentViewModel> FounderInvestments { get; set; } = new List<FounderInvestmentViewModel>();
}
FounderInvestmentViewModel:-
public class FounderInvestmentViewModel
{
public int? Id { get; set; }
public int InvestorId { get; set; }
public double Investment { get; set; }
public int InstallmentPeriod { get; set; }
public IEnumerable<SelectListItem> FounderInvestorList { get; set; }
public List<InstallmentDetailsViewModel> InstallmentDetails { get; set; } = new List<InstallmentDetailsViewModel>();
}
InstallmentDetailsViewModel:-
public class InstallmentDetailsViewModel
{
public int? Id { get; set; }
[Display(Name = "Pay Date")]
public List<DateTime> PayDates { get; set; }
[Required]
public List<double> InstallmentAmounts { get; set; }
}
PartialView for InstallmentDetails (_InstallmentDetails.cshtml):-
#model propertyMgmt.ViewModel.InstallmentDetailsViewModel
<div class="installmentDetails">
#using (Html.BeginCollectionItem("InstallmentDetails"))
{
#Html.HiddenFor(m => m.Id, new { #class = "id" })
<div class="form-group">
#Html.LabelFor(m => m.InstallmentAmounts, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(m => m.InstallmentAmounts, new { htmlAttributes = new { #class = "form-control", #type = "number" } })
#Html.ValidationMessageFor(m => m.InstallmentAmounts, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(m => m.PayDates, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(m => m.PayDates, new { htmlAttributes = new { #class = "form-control", #placeholder = "01/02/2017" } })
#Html.ValidationMessageFor(m => m.PayDates, "", new { #class = "text-danger" })
</div>
</div>
}
</div>
This _InstallmentDetails.cshtml is inserted into this _FounderInvestmentDetails.cshtml which is PartialView for FounderInvestmentDetails View Model:-
#model propertyMgmt.ViewModel.FounderInvestmentViewModel
<div class="founderInvestmentDetails">
#using (Html.BeginCollectionItem("FounderInvestments"))
{
#Html.HiddenFor(m => m.Id, new { #class = "id" })
<div class="form-group">
#Html.LabelFor(m => m.InvestorId, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.DropDownListFor(m => m.InvestorId, Model.FounderInvestorList, "Select Investor", htmlAttributes: new { #class = "form-control" })
#Html.ValidationMessageFor(m => m.InvestorId, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(m => m.Investment, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(m => m.Investment, new { htmlAttributes = new { #class = "form-control", #type = "number" } })
#Html.ValidationMessageFor(m => m.Investment, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(m => m.InstallmentPeriod, htmlAttributes: new { #class = "control-label col-md-2", #type = "number" })
<div class="col-md-10">
#Html.EditorFor(m => m.InstallmentPeriod, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(m => m.InstallmentPeriod, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group" id="installmentDetailsDiv">
#foreach (var InstallmentDetails in Model.InstallmentDetails)
{
#Html.Partial("_InstallmentDetails", InstallmentDetails)
}
</div>
<div class="form-group col-md-10">
<input type="button" class="btn btn-info btn-xs" value="Add Installment Details" onclick="addInstallmentDetails()" />
</div>
}
</div>
This is the MAIN CREATE VIEW :-
#model propertyMgmt.ViewModel.PropertyViewModel.PropertyViewModel
#{
ViewBag.Title = "Create";
}
<script src="~/Areas/Admin/themes/jquery/jquery.min.js"></script>
<h2>Property</h2>
#using (Html.BeginForm("Create", "Property", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
#Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>Add Property</h4>
<hr />
#Html.ValidationSummary(true, "", new { #class = "text-danger" })
<div class="form-group">
#Html.LabelFor(model => model.PropertyTitle, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.PropertyTitle, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.PropertyTitle, "", new { #class = "text-danger" })
</div>
</div>
.....Other form Groups.....
<div id="founderInvestmentDetails">
#foreach(var FounderInvestments in Model.FounderInvestments)
{
#Html.Partial("_FounderInvestmentDetails", FounderInvestments)
}
</div>
<div class="form-group col-md-10" >
<input type="button" class="btn btn-info btn-xs" value="Add Founder Investors" onclick="addFounderInvestors()" />
</div>
</div>
}
This is My JS Code in the Main View:-
function addFounderInvestors() {
var url = '#Url.Action("FounderInvestmentDetails")';
var form = $('form');
var founders = $('#founderInvestmentDetails');
$.get(url, function (response) {
founders.append(response);
// Reparse the validator for client side validation
form.data('validator', null);
$.validator.unobtrusive.parse(form);
});
};
function addInstallmentDetails() {
var url = '#Url.Action("InstallmentDetails")';
var form = $('form');
var installments = $('#installmentDetailsDiv');
$.get(url, function (response) {
installments.append(response);
// Reparse the validator for client side validation
form.data('validator', null);
$.validator.unobtrusive.parse(form);
});
};
Controller Code :-
public PartialViewResult FounderInvestmentDetails()
{
var model = new FounderInvestmentViewModel {
FounderInvestorList = _investorQueryProcessor.GetInvestorByType(1).Select(x => new SelectListItem
{
Value = x.Id.ToString(),
Text = x.InvestorName
})
};
//return PartialView(model);
return PartialView("_FounderInvestmentDetails", model);
}
public PartialViewResult InstallmentDetails()
{
return PartialView("_InstallmentDetails",new InstallmentDetailsViewModel());
}
public ActionResult Create()
{
if (Session["AdminName"] != null)
{
//ViewBag.Investors = SelectListItems;
List<FounderInvestmentViewModel> model = new List<FounderInvestmentViewModel>();
List<InstallmentDetailsViewModel> model2 = new List<InstallmentDetailsViewModel>();
return View(new PropertyViewModel());
}
else return Redirect("/Account/Login");
}
EDIT:-
Sorry this is what is throwing the exception -->> Collection.cshtml
PROCESS:- In the Main View, "Add Founder Investor Buttons" on click event adds the partial view _FounderInvestmentDetails.cshtml successfully.Now the "Add Installment Details" button is appended.Upon clicking this "Add Installment Details" button _InstallmentDetails.cshtml partial view should be appended,BUT this part is not working. When I click this button, I get the error "Object reference not set to an instance of an object" in the following code:-
#using HtmlHelpers.BeginCollectionItem
<ul>
#foreach (object item in Model)-->>ERROR CODE
{
<li>
#using (Html.BeginCollectionItem(Html.ViewData.TemplateInfo.HtmlFieldPrefix))
{
#Html.EditorFor(_ => item, null, "")
}
</li>
}
</ul>
The Paydates and Installments does not need to be <List> as it already is a PartialView and can be added multiple times.
public class InstallmentDetailsViewModel {
public int? Id { get; set; }
[Display(Name = "Pay Date")]
public List<DateTime> PayDates { get; set; }
[Required]
public List<double> InstallmentAmounts { get; set; }
}
ORIGINAL
I have a website where I can manage cars, brands, and car models. Right now I have controllers, models and views, the application is working, everything was auto generated by Visual Studio, and i am using entity framework (database first).
When I try to create a car, the dropdowns with brands and Car models are not cascading like I want.
I have a solution: add a class (or other property/attribute) to each option tag on each select (dropdown). Then, with JS, i'll do the rest. I just want to know how can I do a foreach loop to build my dropdown, even if it's not the best solution, i'm not discussing that. Remember, I need to do a foreach loop to the carmodel Model, inside the Cars View.
EDIT
Car View
#model MyApp.Models.car
#{
ViewBag.Title = "Create";
}
<h2>Create</h2>
#using (Html.BeginForm())
{
#Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>car</h4>
<hr />
#Html.ValidationSummary(true, "", new { #class = "text-danger" })
<div class="form-group">
#Html.LabelFor(model => model.bodytypeId, "bodytypeId", htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.DropDownList("bodytypeId", null, htmlAttributes: new { #class = "form-control" })
#Html.ValidationMessageFor(model => model.bodytypeId, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.manufacturerId, "manufacturerId", htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.DropDownList("manufacturerId", null, htmlAttributes: new { #class = "form-control" })
#Html.ValidationMessageFor(model => model.manufacturerId, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.modelId, "modelId", htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.DropDownList("modelId", null, htmlAttributes: new { #class = "form-control" })
#Html.ValidationMessageFor(model => model.modelId, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.versionId, "versionId", htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.DropDownList("versionId", null, htmlAttributes: new { #class = "form-control" })
#Html.ValidationMessageFor(model => model.versionId, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.fuelId, "fuelId", htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.DropDownList("fuelId", null, htmlAttributes: new { #class = "form-control" })
#Html.ValidationMessageFor(model => model.fuelId, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.transmissionId, "transmissionId", htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.DropDownList("transmissionId", null, htmlAttributes: new { #class = "form-control" })
#Html.ValidationMessageFor(model => model.transmissionId, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.colorId, "colorId", htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.DropDownList("colorId", null, htmlAttributes: new { #class = "form-control" })
#Html.ValidationMessageFor(model => model.colorId, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.horsePower, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.horsePower, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.horsePower, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.kw, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.kw, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.kw, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.cc, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.cc, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.cc, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.Co2Emissions, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.Co2Emissions, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.Co2Emissions, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.mileage, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.mileage, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.mileage, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.year, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.year, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.year, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.doors, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.doors, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.doors, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.seats, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.seats, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.seats, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.plate, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.plate, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.plate, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.price, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.price, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.price, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.shortDescription, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.shortDescription, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.shortDescription, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.longDescription, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.longDescription, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.longDescription, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.sold, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
<div class="checkbox">
#Html.EditorFor(model => model.sold)
#Html.ValidationMessageFor(model => model.sold, "", new { #class = "text-danger" })
</div>
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.active, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
<div class="checkbox">
#Html.EditorFor(model => model.active)
#Html.ValidationMessageFor(model => model.active, "", new { #class = "text-danger" })
</div>
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.dateAdded, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.dateAdded, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.dateAdded, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.dateSold, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.dateSold, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.dateSold, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</div>
</div>
}
<div>
#Html.ActionLink("Back to List", "Index")
</div>
#section Scripts {
#Scripts.Render("~/bundles/jqueryval")
}
Car Model
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated from a template.
//
// Manual changes to this file may cause unexpected behavior in your application.
// Manual changes to this file will be overwritten if the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
namespace MyApp.Models
{
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Web.Mvc;
public partial class car
{
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
public car()
{
this.carimages = new HashSet<carimage>();
}
public int id { get; set; }
[Display(Name = "#")]
public Nullable<int> bodytypeId { get; set; }
[Display(Name = "Body Type")]
public Nullable<int> manufacturerId { get; set; }
[Display(Name = "Model")]
public Nullable<int> modelId { get; set; }
[Display(Name = "Version")]
public Nullable<int> versionId { get; set; }
[Display(Name = "Fuel")]
public Nullable<int> fuelId { get; set; }
[Display(Name = "Transmission")]
public Nullable<int> transmissionId { get; set; }
[Display(Name = "Color")]
public Nullable<int> colorId { get; set; }
[Display(Name = "HP")]
public Nullable<int> horsePower { get; set; }
[Display(Name = "KW")]
public Nullable<int> kw { get; set; }
[Display(Name = "CC")]
public Nullable<int> cc { get; set; }
[Display(Name = "CO2")]
public Nullable<double> Co2Emissions { get; set; }
[Display(Name = "Mileage")]
public Nullable<int> mileage { get; set; }
[Display(Name = "Year")]
public Nullable<int> year { get; set; }
[Display(Name = "Doors")]
public Nullable<int> doors { get; set; }
[Display(Name = "Seats")]
public Nullable<int> seats { get; set; }
[Display(Name = "Plate")]
public string plate { get; set; }
[Display(Name = "Price")]
public Nullable<int> price { get; set; }
[Display(Name = "Short Description")]
public string shortDescription { get; set; }
[Display(Name = "Long Description")]
public string longDescription { get; set; }
[Display(Name = "Sold")]
public bool sold { get; set; }
[Display(Name = "Active")]
public bool active { get; set; }
[Display(Name = "Date Added")]
[DataType(DataType.DateTime)]
[DisplayFormat(DataFormatString = "{0:dd-MM-yyyy hh:mm}", ApplyFormatInEditMode = true)]
public Nullable<System.DateTime> dateAdded { get; set; }
[Display(Name = "Date Sold")]
[DataType(DataType.DateTime)]
[DisplayFormat(DataFormatString = "{0:dd-MM-yyyy hh:mm}", ApplyFormatInEditMode = true)]
public Nullable<System.DateTime> dateSold { get; set; }
public virtual bodytype bodytype { get; set; }
public virtual color color { get; set; }
public virtual fuel fuel { get; set; }
public virtual manufacturer manufacturer { get; set; }
public virtual model model { get; set; }
public virtual transmission transmission { get; set; }
public virtual version version { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<carimage> carimages { get; set; }
}
}
Car Controller
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;
using MyApp.Models;
namespace MyApp.Controllers
{
public class carsController : Controller
{
private MyAppEntities db = new MyAppEntities();
// GET: cars
public ActionResult Index(string id)
{
string searchString = id;
var cars = db.cars.Include(c => c.bodytype).Include(c => c.color).Include(c => c.fuel).Include(c => c.manufacturer).Include(c => c.model).Include(c => c.transmission).Include(c => c.version);
if (!String.IsNullOrEmpty(searchString))
{
cars = cars.Where(s => s.bodytype.name.Contains(searchString) ||
s.cc.ToString().Contains(searchString) ||
s.Co2Emissions.ToString().Contains(searchString) ||
s.color.name.Contains(searchString) ||
s.dateAdded.Value.ToString("dd-mm-yyyy").Contains(searchString) ||
s.dateSold.Value.ToString("dd-mm-yyyy").Contains(searchString) ||
s.doors.ToString().Contains(searchString) ||
s.fuel.name.Contains(searchString) ||
s.horsePower.ToString().Contains(searchString) ||
s.id.ToString().Contains(searchString) ||
s.kw.ToString().Contains(searchString) ||
s.longDescription.Contains(searchString) ||
s.manufacturer.name.Contains(searchString) ||
s.mileage.ToString().Contains(searchString) ||
s.model.name.Contains(searchString) ||
s.plate.Contains(searchString) ||
s.price.ToString().Contains(searchString) ||
s.seats.ToString().Contains(searchString) ||
s.shortDescription.Contains(searchString) ||
s.transmission.name.Contains(searchString) ||
s.version.name.Contains(searchString) ||
s.year.ToString().Contains(searchString)
);
}
return View(cars.ToList());
}
// GET: cars/Details/5
public ActionResult Details(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
car car = db.cars.Find(id);
if (car == null)
{
return HttpNotFound();
}
return View(car);
}
// GET: cars/Create
public ActionResult Create()
{
ViewBag.bodytypeId = new SelectList(db.bodytypes, "id", "name");
ViewBag.colorId = new SelectList(db.colors, "id", "name");
ViewBag.fuelId = new SelectList(db.fuels, "id", "name");
ViewBag.manufacturerId = new SelectList(db.manufacturers, "id", "name");
ViewBag.modelId = new SelectList(db.models, "id", "name");
ViewBag.transmissionId = new SelectList(db.transmissions, "id", "name");
ViewBag.versionId = new SelectList(db.versions, "id", "name");
return View();
}
// POST: cars/Create
// To protect from overposting attacks, please enable the specific properties you want to bind to, for
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create([Bind(Include = "id,bodytypeId,manufacturerId,modelId,versionId,fuelId,transmissionId,colorId,horsePower,kw,cc,Co2Emissions,mileage,year,doors,seats,plate,price,shortDescription,longDescription,sold,active,dateAdded,dateSold")] car car)
{
if (ModelState.IsValid)
{
db.cars.Add(car);
db.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.bodytypeId = new SelectList(db.bodytypes, "id", "name", car.bodytypeId);
ViewBag.colorId = new SelectList(db.colors, "id", "name", car.colorId);
ViewBag.fuelId = new SelectList(db.fuels, "id", "name", car.fuelId);
ViewBag.manufacturerId = new SelectList(db.manufacturers, "id", "name", car.manufacturerId);
ViewBag.modelId = new SelectList(db.models, "id", "name", car.modelId);
ViewBag.transmissionId = new SelectList(db.transmissions, "id", "name", car.transmissionId);
ViewBag.versionId = new SelectList(db.versions, "id", "name", car.versionId);
return View(car);
}
// GET: cars/Edit/5
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
car car = db.cars.Find(id);
if (car == null)
{
return HttpNotFound();
}
ViewBag.bodytypeId = new SelectList(db.bodytypes, "id", "name", car.bodytypeId);
ViewBag.colorId = new SelectList(db.colors, "id", "name", car.colorId);
ViewBag.fuelId = new SelectList(db.fuels, "id", "name", car.fuelId);
ViewBag.manufacturerId = new SelectList(db.manufacturers, "id", "name", car.manufacturerId);
ViewBag.modelId = new SelectList(db.models, "id", "name", car.modelId);
ViewBag.transmissionId = new SelectList(db.transmissions, "id", "name", car.transmissionId);
ViewBag.versionId = new SelectList(db.versions, "id", "name", car.versionId);
return View(car);
}
// POST: cars/Edit/5
// To protect from overposting attacks, please enable the specific properties you want to bind to, for
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit([Bind(Include = "id,bodytypeId,manufacturerId,modelId,versionId,fuelId,transmissionId,colorId,horsePower,kw,cc,Co2Emissions,mileage,year,doors,seats,plate,price,shortDescription,longDescription,sold,active,dateAdded,dateSold")] car car)
{
if (ModelState.IsValid)
{
db.Entry(car).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.bodytypeId = new SelectList(db.bodytypes, "id", "name", car.bodytypeId);
ViewBag.colorId = new SelectList(db.colors, "id", "name", car.colorId);
ViewBag.fuelId = new SelectList(db.fuels, "id", "name", car.fuelId);
ViewBag.manufacturerId = new SelectList(db.manufacturers, "id", "name", car.manufacturerId);
ViewBag.modelId = new SelectList(db.models, "id", "name", car.modelId);
ViewBag.transmissionId = new SelectList(db.transmissions, "id", "name", car.transmissionId);
ViewBag.versionId = new SelectList(db.versions, "id", "name", car.versionId);
return View(car);
}
// GET: cars/Delete/5
public ActionResult Delete(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
car car = db.cars.Find(id);
if (car == null)
{
return HttpNotFound();
}
return View(car);
}
// POST: cars/Delete/5
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int id)
{
car car = db.cars.Find(id);
db.cars.Remove(car);
db.SaveChanges();
return RedirectToAction("Index");
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
db.Dispose();
}
base.Dispose(disposing);
}
}
}
Original
With ASP.NET MVC, you use server-side pre-processing to bind servers-side models to the .cshtml. From within the markup you can use tag helpers to build out common controls and user input components, this is where the razor view engine comes into play. Odeto-Code by Scott Allen has a great article on how you use these technologies together to build out a drop-down-list control specifically.
Here is part of that examples, .cshtml:
#Html.LabelFor(m=>m.SelectedFlavorId)
#Html.DropDownListFor(m => m.SelectedFlavorId, Model.FlavorItems)
#Html.ValidationMessageFor(m=>m.SelectedFlavorId)
<input type="submit" value="Submit" />
And here is the corresponding model, ViewModel.cs:
public class ViewModel
{
private readonly List<IceCreamFlavor> _flavors;
[Display(Name = "Favorite Flavor")]
public int SelectedFlavorId { get; set; }
public IEnumerable<SelectListItem> FlavorItems
{
get { return new SelectList(_flavors, "Id", "Name");}
}
}
As an additional resource there is actually several other stackoverflow Q/A's that cover questions similar to this, here is one that is noteable.
Update 1
I just want to know how can I do a foreach loop to build my dropdown
Again you can use the razor view engine here. It allows for interaction with a server-side C# model and a means to build HTML markup from that. Here is an example:
<select>
#{
foreach (var item in Model.ListOfItems)
{
<option value="item.Value" customAttribute="item.SomethingSpecial">
item.Name
</option>
}
}
</select>
Update 2
You car model does not define a list of models. You need to specify what the options are in order to do a foreach. In other words you cannot build a dropdownlist from a property on a C# model that is not a list. Does that help?
You can do this in C# rather than JS, a quick example here:
public class FindUser
{
// Where the items from the DB will be kept
public Dictionary<int, string> CountryList { get; set; }
// Used to store the users selected option
public int SelectedCountry { get; set; }
// A constructor to be called when the page renders
public FindUser()
{
PopulateCountryDropdown();
}
public void PopulateLeaDropdown()
{
// 1. Grab your items from the database, store it within a databale
// 2. Loop through the datatable and add each row to the list
CountryList = new Dictionary<int, string>();
foreach(DataRow row in dt.Rows)
{
CountryList.Add(Convert.ToInt32(row["ID"]), row["country"].ToString());
}
}
}
Then in your frontend add:
#Html.DropDownListFor(u => u.SelectedCountry, new SelectList(Model.CountryList, "Key", "Value"), "Select your country", new { #class = "form-control countries", id = "country_list" })
Solution found HERE
School database with the following 2 tables.
StateMaster
DistrictMaster
Step 1
Open Visual Studio then select File >> New >> Project then select ASP.Net MVC 4 Web Application.
Step 2
Select Internet Application then click OK.
Step 3
Select the Model folder then create a new Model class.
StudentModel.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace MvcDemoApplication.Models
{
public class StudentModel
{
public IList<SelectListItem> StateNames { get; set; }
public IList<SelectListItem> DistrictNames { get; set; }
}
}
Step 4
Create a .edmx file and connect with the database.
Step 5
Create a new Controller. In this article I create DropDownListController.cs.
DropDownListController.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcDemoApplication.Models;
namespace MvcDemoApplication.Controllers
{
public class DropDownListController : Controller
{
//
// GET: /DropDownList/
SchoolEntities schoolEntity = new SchoolEntities();
public ActionResult Index()
{
List<SelectListItem> stateNames = new List<SelectListItem>();
StudentModel stuModel=new StudentModel();
List<StateMaster> states = schoolEntity.StateMasters.ToList();
states.ForEach(x =>
{
stateNames.Add(new SelectListItem { Text = x.StateName , Value = x.StateId.ToString() });
});
stuModel.StateNames = stateNames;
return View(stuModel);
}
}
}
Index.cshtml
#model MvcDemoApplication.Models.StudentModel
#{
ViewBag.Title = "Index";
}
<script src="~/Scripts/jquery-1.7.1.min.js"></script>
<h2>Cascading Dropdownlist</h2>
<table>
<tr>
<td>
<label>State</label>
</td>
<td>
#Html.DropDownListFor(x => x.StateNames, Model.StateNames, "--Select--", new { #id="ddlState"});
</td>
</tr>
</table>
Understand the Code
In Studentmodel we have the following 2 properties:
public IList<SelectListItem> StateNames { get; set; }
public IList<SelectListItem> DistrictNames { get; set; }
Here we are using the SelectListItem class, this class has the following 3 properties:
Selected: This is a bool type to show in a dropdown (as selected) true or false by default.
Text: This is a string type, for the dropdown text.
Value: This is string type for the value of the dropdown
If you notice in the dropdownlist, we also need the same properties. For this reason we are using SelectListItem in a Ilist.
DropdownlistController.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcDemoApplication.Models;
namespace MvcDemoApplication.Controllers
{
public class DropDownListController : Controller
{
//
// GET: /DropDownList/
SchoolEntities schoolEntity = new SchoolEntities();
public ActionResult Index()
{
List<SelectListItem> stateNames = new List<SelectListItem>();
StudentModel stuModel=new StudentModel();
List<StateMaster> states = schoolEntity.StateMasters.ToList();
states.ForEach(x =>
{
stateNames.Add(new SelectListItem { Text = x.StateName , Value = x.StateId.ToString() });
});
stuModel.StateNames = stateNames;
return View(stuModel);
}
}
In the preceding code we create the SchoolEntities object, in this object all the related tables exist.
SchoolEntities schoolEntity = new SchoolEntities();
List<StateMaster> states = schoolEntity.StateMasters.ToList();
In the preceding line of code, all the related data of the StateMasters tables comes into the StateMaster list object.
states.ForEach(x =>
{
stateNames.Add(new SelectListItem { Text = x.StateName , Value = x.StateId.ToString() });
});
Now it is time to add entity data into the Text and value properties, the all collection will be stored into the stateNames object.
Index.cshtml
#model MvcDemoApplication.Models.StudentModel
#{
ViewBag.Title = "Index";
}
<script src="~/Scripts/jquery-1.7.1.min.js"></script>
<h2>Cascading Dropdownlist</h2>
<table>
<tr>
<td>
<label>State</label>
</td>
<td>
#Html.DropDownListFor(x => x.StateNames, Model.StateNames, "--Select--", new { #id="ddlState"});
</td>
</tr>
</table>
The preceding code shows the model data in View. Now to understand how it works.
#Html.DropDownListFor(x => x.StateNames, Model.StateNames, "--Select--", new { #id="ddlState"});
Look at the preceding code, we used here, #Html helper classes for creating a DropDownList. In the DropDownListFor helper class we used 4 parameters.
x=>x.StateNames: For getting the values of the collection from the entity.
Model.StateNames: Collections of states.
“—Select--”: Default value, when the dropdown list will be populated.
new {#id=”ddlState”}: In this part we can define an id, class and name for the control.
How to do cascading between two dropdownlists.
DropdownlistController.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcDemoApplication.Models;
namespace MvcDemoApplication.Controllers
{
public class DropDownListController : Controller
{
//
// GET: /DropDownList/
SchoolEntities1 schoolEntity = new SchoolEntities1();
public ActionResult Index()
{
List<SelectListItem> stateNames = new List<SelectListItem>();
StudentModel stuModel=new StudentModel();
List<StateMaster> states = schoolEntity.StateMasters.ToList();
states.ForEach(x =>
{
stateNames.Add(new SelectListItem { Text = x.StateName , Value = x.StateId.ToString() });
});
stuModel.StateNames = stateNames;
return View(stuModel);
}
[HttpPost]
public ActionResult GetDistrict(string stateId)
{
int statId;
List<SelectListItem> districtNames = new List<SelectListItem>();
if (!string.IsNullOrEmpty(stateId))
{
statId = Convert.ToInt32(stateId);
List<DistrictMaster> districts = schoolEntity.DistrictMasters.Where(x => x.StateId == statId).ToList();
districts.ForEach(x =>
{
districtNames.Add(new SelectListItem { Text = x.DistrictName, Value = x.DistrictId.ToString() });
});
}
return Json(districtNames, JsonRequestBehavior.AllowGet);
}
}
}
Index.cshtml
#model MvcDemoApplication.Models.StudentModel
#{
ViewBag.Title = "Index";
}
<script src="~/Scripts/jquery-1.7.1.min.js"></script>
<h2>Cascading Dropdownlist</h2>
<table>
<tr>
<td>
<label>State</label>
</td>
<td>
#Html.DropDownListFor(x => x.StateNames, Model.StateNames, "--Select--", new { #id="ddlState"});
</td>
</tr>
<tr>
<td>
<label>District</label>
</td>
<td id="District">
#Html.DropDownListFor(x => x.DistrictNames, new List<SelectListItem>(), "--Select--", new { #id="ddlDistrict"});
</td>
</tr>
</table>
<script type="text/javascript">
$(document).ready(function () {
$('#ddlState').change(function () {
$.ajax({
type: "post",
url: "/DropDownList/GetDistrict",
data: { stateId: $('#ddlState').val() },
datatype: "json",
traditional: true,
success: function (data) {
var district = "<select id='ddlDistrict'>";
district = district + '<option value="">--Select--</option>';
for (var i = 0; i < data.length; i++)
{
district = district + '<option value=' + data[i].Value + '>' + data[i].Text + '</option>';
}
district = district + '</select>';
$('#District').html(district);
}
});
});
});
</script>
That's it. Press F5 and run your code.
Look at Nuget package Mvc.CascadeDropDown:
https://www.nuget.org/packages/Mvc.CascadeDropDown/
Here is how I am using it:
#Html.CascadingDropDownListFor(m => m.ArticleGroup_Nr, "Department_Nr",
Url.Action("GetArticleGroups"), "DepartmentNr", "-- Select item --", true,
new { #class = "form-control", style = "width: 450px" })
Here Department_Nr specifies the parent dropdown elsewhere in the View - either a regular dropdownlist or another cascaded dropdownlist.
I then created a JSON Action GetArticleGroups on the same Controller that accepts a DepartmentNr parameter, which is passed the current value of the parent dropdown.
The JSON Action will be called everytime the value of the parent dropdown is changed because #Html.Cascading... also attaches an onchange-eventhandler to the parent object.
public virtual JsonResult GetArticleGroups(int DepartmentNr)
{
var items = provider.ArticleGroups.Where(m => m.Parent_Nr == DepartmentNr);
return GetJson(items); // convert items to JSON [ { "Value":"xx", "Text":"yy" } ]
}
private JsonResult GetJson(IQueryable<ICatalogueItem> items)
{
var data = items
.Select(x => new { Value = x.Number, Text = x.Text })
.OrderBy(o => o.Text);
return Json(data, JsonRequestBehavior.AllowGet);
}
... Or see this article on how to build it yourself:
http://www.c-sharpcorner.com/UploadFile/4d9083/creating-simple-cascading-dropdownlist-in-mvc-4-using-razor/