We Keep Coding

Pass value of dropdownlist when click button

I have a dropdownlist in my View:
#Html.DropDownListFor(m => m.APtTitleData.apt, (IEnumerable<SelectListItem>)ViewBag.apt, "-Select Apt-", new { id = "SelectedAPt", name= "SelectedAPt" })
and I have a button in the same View
GO
How do I pass the value of the dropdown to my controller (Edit)? I'm trying to get the value to the button, but I'm not sure this is the right way. Any other idea?

I would suggest that you use a form where you submit the value from the dropdown to the controller.
Please check out the following code:
#using (Html.BeginForm("APtTitle", "Edit", FormMethod.Post))
{
<div class="form-group">
<label>AptTitles</label>
<div>
#Html.DropDownListFor(m => m.APtTitleData.apt, (IEnumerable<SelectListItem>)ViewBag.apt, "-Select Apt-", new { id = "SelectedAPt", name= "SelectedAPt" })
</div>
</div>
<div class="form-group">
<div>
<input type="submit" value="Submit" />
</div>
</div>
</div>
}
And in the controller your code should look similar to the following:
[HttpPost]
public ActionResult Edit(string SelectedAPt)
{
var aPtValue = SelectedAPt;
// Do what intended with the value
}
You should now be able to see the value in the controller now.
Try it out and let me know if you run into issues.

ASP.NET MVC Using Partial Views as Dialogs

I have an ASP.NET MVC app. This app has a view that shows a list of records. I want to let my users add a record to this list. To do that, I've created a dialog that the user can enter information into. At this time, this dialog is a partial. I'm willing to change the implementation. I just need a dialog for adding. At this time, my views look like this:
Index.cshtml
<table class="table">
<thead>
<tr>
<th></th>
<th>First Name</th>
<th>Last Name</th>
<th>Email address</th>
</tr>
</thead>
<tbody>
#foreach (var user in Model.Users)
{
<tr>
<td></td>
<td>#user.FirstName</td>
<td>#user.LastName</td>
<td>#user.Email</td>
</tr>
}
</tbody>
</table>
<br />
<button type="button" class="btn btn-default" onclick="addPerson()">Add Person</button>
#* Add Person dialog *#
<div id="addPersonModal" class="modal">
<div class="modal-dialog">
#{Html.RenderAction("Add", "Person");}
</div>
</div>
<script type="text/javascript">
function addPerson() {
$('#addPersonModal').modal('show');
}
</script>
Add.cshtml
#model MyApp.Models.AddPersonModel
#{ Layout = null; }
<div class="modal-content">
#using(Html.BeginForm("Add", "Person", FormMethod.Post))
{
<div class="modal-header">
<h4 class="modal-title">Add New Person</h4>
</div>
<div class="modal-body">
#Html.ValidationSummary(true, "", new { #class = "text-danger" })
<div class="row">
<div class="col-md-6">
#Html.TextBoxFor(m => m.FirstName)
</div>
<div class="col-md-6">
#Html.TextBoxFor(m => m.LastName)
</div>
</div>
<div class="row">
<div class="col-md-12">
#Html.TextBoxFor(m => m.Email)
</div>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Cancel</button>
<button type="submit" class="btn btn-primary">Create</button>
</div>
#Html.AntiForgeryToken()
}
</div>
PersonController.cs
namespace MyApp.Controllers
{
public class PersonController : Controller
{
public ActionResult Index()
{
var model = new IndexModel();
return View(model);
}
public ActionResult Add()
{
var model = new AddPersonModel();
return View(model);
}
[HttpPost]
public ActionResult Add(AddPersonModel model)
{
if (ModelState.IsValid)
{
model.Save();
}
else
{
// I'm stuck here.
}
var listModel = new IndexModel();
return View("~/Views/Person/Index.cshtml", listModel );
}
}
}
Everything works except for validation. If the user enters some invalid data, the view reloads the entire screen and the data is lost. The dialog is also closed. I need to be able to show the values the user entered and the validation summary in the dialog window if the data is invalid. Yet, I'm not sure how to do this.

Converting checkbox result into model's value

I have an ASP.NET project and I have some checkbox to select the recurrence. I want to convert that to a string that will display it.
A simple version is
Create.cshtml
#using (Html.BeginForm())
{
#Html.ValidationSummary(true)
<fieldset>
<p style="font-weight:bold">New Record</p>
<div id="date">
<input type="checkbox" value="Sunday" />Sunday
<input type="checkbox" value="Monday" />Monday
<input type="checkbox" value="Tuesday" />Tuesday
...
</div>
<p>
<input type="submit" value="Create" />
</p>
<div align="left">
<font color="black" size="4" > #Html.ActionLink("<<Back to List", "Index", "Home", null, null)</font>
</div>
</fieldset>
}
And I want to save it in the model as a simple string like "1011011"
Standard Create function
[HttpPost]
public ActionResult Create(Event event)
{
if (ModelState.IsValid)
{
using (var context = new EventDBContext())
{
context.RecordList.Add(event);
context.SaveChanges();
}
return View("Index");
}
return View("Error");
}
What is the proper way to do this?

Utilize the CheckBoxFor Input extension
There are all sorts of walkthroughs on using them.

Why does DbContext.Entry(IEnumerable<MedicalProduct>).State produce an ArguementNullException in my code?

In my MedicalProductController, I am trying to make my Edit action able to edit multiple objects on one page. To do that, I plan on my HTTPPOST edit action method receiving an IEnumerable<MedicalProduct> instead of the MedicalProduct that the scaffolding set up for me.
When I click save to submit some changes, I get an ArguementNullException unhandled on the line: _db.Entry(productList).State = EntityState.Modified; and I don't understand why it is null.
MedicalProductController:
public class MedicalProductController : Controller
{
private MvcMedicalStoreDb _db = new MvcMedicalStoreDb();
// some code omitted for brevity
public ActionResult Edit(int id = 0)
{
MedicalProduct product = _db.Products.Find(id);
if (product == null)
{
return HttpNotFound();
}
var productList = new List<MedicalProduct> { product };
var viewModel = GetMedicalProductViewModelList(productList);
return View(viewModel);
}
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(IEnumerable<MedicalProduct> productList)
{
if (ModelState.IsValid)
{
_db.Entry(productList).State = EntityState.Modified;
_db.SaveChanges();
return RedirectToAction("Index");
}
//var productList = new List<MedicalProduct> { product };
var viewModel = GetMedicalProductViewModelList(productList);
return View(viewModel);
}
}
Edit.cshtml:
#model IEnumerable<MvcMedicalStore.Models.MedicalProductViewModel>
#{
ViewBag.Title = "Edit";
}
<h2>Edit</h2>
#using (Html.BeginForm()) {
#Html.AntiForgeryToken()
#Html.ValidationSummary(true)
<fieldset>
<legend>MedicalProduct</legend>
#foreach (var modelItem in Model)
{
#Html.HiddenFor(item => modelItem.ID)
<div class="editor-label">
#Html.LabelFor(item => modelItem.Name)
</div>
<div class="editor-field">
#Html.EditorFor(item => modelItem.Name)
#Html.ValidationMessageFor(item => modelItem.Name)
</div>
<div class="editor-label">
#Html.LabelFor(item => modelItem.Price)
</div>
<div class="editor-field">
#Html.EditorFor(item => modelItem.Price)
#Html.ValidationMessageFor(item => modelItem.Price)
</div>
<div class="editor-label">
#Html.LabelFor(item => modelItem.BrandName)
</div>
<div class="editor-field">
#Html.DropDownListFor(item => modelItem.BrandName, modelItem.BrandSelectListItem)
#Html.ValidationMessageFor(item => modelItem.BrandName)
</div>
}
<p>
<input type="submit" value="Save" />
</p>
</fieldset>
}
<div>
#Html.ActionLink("Back to List", "Index")
</div>
#section Scripts {
#Scripts.Render("~/bundles/jqueryval")
}

It looks to me like the model binder isn't able to bind to your collection, which would cause it to be null. The reason it's doing that is because you're not specifying an index for each of the elements. That means MVC has no way to determine how to bind them correctly.
Edit
I've figured out why the last revision of this answer didn't work. Firstly, IEnumerable<T> doesn't have a direct indexer. Instead you would use Model.ElementAt(i).ID to access the ID property. However, this actually wouldn't solve the problem with the model binding issue as, for some reason, this doesn't generate the proper indices on the name attributes for the generated <input> fields. (More on this below.)
There are two ways to fix that. The first way would be to pass a List to the view, instead of IEnumerable, then accessing the fields as I showed earlier. However, the better way would be to create an EditorTemplate instead. This will be easier because it saves you having to change your existing methods which are generating your view model. So you'll need to follow these steps:
Create an EditorTemplates folder inside your view's current folder (e.g. if your view is Home\Index.cshtml, create the folder Home\EditorTemplates).
Create a strongly-typed view in that directory with the name that matches your model (e.g in this case the view would be called MedicalProductViewModel).
Move the bulk of your original view into that new template.
You'll end up with the following:
#model MedicalProductViewModel
#Html.HiddenFor(item => Model.ID)
<div class="editor-label">
#Html.LabelFor(item => Model.Name)
</div>
<div class="editor-field">
#Html.EditorFor(item => Model.Name)
#Html.ValidationMessageFor(item => Model.Name)
</div>
<div class="editor-label">
#Html.LabelFor(item => Model.Price)
</div>
<div class="editor-field">
#Html.EditorFor(item => Model.Price)
#Html.ValidationMessageFor(item => Model.Price)
</div>
<div class="editor-label">
#Html.LabelFor(item => Model.BrandName)
</div>
<div class="editor-field">
#Html.DropDownListFor(item => Model.BrandName, Model.BrandSelectListItem)
#Html.ValidationMessageFor(item => Model.BrandName)
</div>
Notice how we're no longer using any indexing notation to access the model properties.
Now in your Edit.cshtml view, you'd be left with this:
#model IEnumerable<MvcMedicalStore.Models.MedicalProductViewModel>
#{
ViewBag.Title = "Edit";
}
<h2>Edit</h2>
#using (Html.BeginForm()) {
#Html.AntiForgeryToken()
#Html.ValidationSummary(true)
<fieldset>
<legend>MedicalProduct</legend>
#Html.EditorFor(m => m)
<p>
<input type="submit" value="Save" />
</p>
</fieldset>
}
<div>
#Html.ActionLink("Back to List", "Index")
</div>
#section Scripts {
#Scripts.Render("~/bundles/jqueryval")
}
Although I gave a brief explanation at the start, I should really explain what this is actually doing. Your original HTML would have produced output like the following:
<input name="ID" type="text" value="1" />
<input name="Name" type="text" value="Name 1" />
<input name="ID" type="text" value="2" />
<input name="Name" type="text" value="Name 2" />
As you can see, multiple input fields share the same name. That's why the model binder is tripping up, because your action is telling it to bind to a collection and the binder needs to be able to distinguish between each element in the collection. EditorTemplates are smart enough to figure out when you're working with a collection and will apply indices to your input fields automatically. What the code above will do is generate output like this instead:
<input name="[0].ID" type="text" value="1" />
<input name="[0].Name" type="text" value="Name 1" />
<input name="[1].ID" type="text" value="2" />
<input name="[1].Name" type="text" value="Name 2" />
As you can see, the fields now have an index associated with them. That gives the model binder all the information it needs to be able to add all of the items to the collection. Now that's out of the way, we can get back to fixing your product saving code.
What Gert said is still right about the way you're trying to save productList. You need to be setting the EntityState.Modified flag on each individual item in that collection:
if (ModelState.IsValid)
{
foreach (var product in productList)
_db.Entry(product).State = EntityState.Modified;
_db.SaveChanges();
return RedirectToAction("Index");
}
See if that works.

Model not being passed to rendered view

I am having an issue getting data in my model on my MakePayment.cshmtl view.
The AccountScreen.cshtml is calling the MakePayment.cshtml view:
#model SuburbanCustPortal.SuburbanService.CustomerData
#{
ViewBag.Title = "Account Screen";
}
<h2>AccountScreen</h2>
<div class="leftdiv">
<fieldset>
<legend>customer info</legend>
#Html.Partial("CustomerInfoPartialView", Model)
</fieldset>
<fieldset>
<legend>delivery address</legend>
#Html.Partial("DeliveryAddressPartialView", Model)
</fieldset>
<fieldset>
<legend>delivery info</legend>
#Html.Partial("DeliveryInfoPartialView", Model)
</fieldset>
</div>
<div class="rightdiv">
<fieldset>
<legend>balance</legend>
<div>
#Html.Partial("BalancePartialView", Model)
</div>
</fieldset>
<fieldset>
<legend>payment</legend>
<div>
#Html.Partial("MakePayment", Model)
</div>
</fieldset>
<fieldset>
<legend>billing info</legend>
<div>
#Html.Partial("BillingInfoPartialView", Model)
</div>
</fieldset>
</div>
My MakePayment.cshtml view:
#model SuburbanCustPortal.SuburbanService.CustomerData
#using (Html.BeginForm("MakePayment2", "Customer", FormMethod.Post))
{
<div style="text-align:center;">
<input class="makePaymentInput" type="submit" value="Make a Payment" />
</div>
}
My CustomerController:
public ActionResult AccountScreen(LogOnModel model)
{
return ShowCustomer(model.AccountNumber);
}
public ActionResult MakePayment(CustomerData model)
{
return View("MakePayment", model);
}
[HttpPost]
public ActionResult MakePayment2(CustomerData model)
{
//CustomerData model = new CustomerData();
var newmodel = new PaymentModel.SendToGateway();
newmodel.AccountBalance = model.TotalBalance;
newmodel.Amount = model.TotalBalance;
return RedirectToAction("PrePayment", "Payment", newmodel);
}
The public ActionResult MakePayment(CustomerData model) is never being reached.
My problem: The [HttpPost] public ActionResult MakePayment2(CustomerData model) is being reached but the model has nulls in it.
I know the data initial model from the AccountScreen is being populated since the other views that are being rendered is showing data.
Anyone see what I am doing wrong?

The problem is there's nothing inside your form except a submit button. You need to make sure input fields are there (either text boxes, select lists, or hidden fields), as those are what post data back to the controller.
You could try using EditorForModel inside your partial view:
#using (Html.BeginForm("MakePayment2", "Customer", FormMethod.Post))
{
#Html.EditorForModel()
<div style="text-align:center;">
<input class="makePaymentInput" type="submit" value="Make a Payment" />
</div>
}
Edit based on comments
Razor doesn't include an Html.HiddenForModel() method, for whatever reason. Possible workarounds:
List out each property of the model using Html.HiddenFor(model => model.Property)
Annotate the model properties with \[HiddenInput\]
Use EditorForModel() but wrap it in <div style="display: none;"></div> (NOTE that a malicious user can still modify the properties as if they were visible.)
Use only Html.HiddenFor(model => model.id) and fetch the model in the controller.
Use the serialization method in the MVC Futures assembly
Related quesion here:
Is there some way to use #Html.HiddenFor for complete model?

The problem is, you are creating a form containing nothing else than a submit button.
When you submit it, it posts nothing back to the server, thus your function receives an empty model.
#using (Html.BeginForm("MakePayment2", "Customer", FormMethod.Post))
{
<div style="text-align:center;">
<input class="makePaymentInput" type="submit" value="Make a Payment" />
</div>
}
This translates as :
<form method="POST" action="{url}">
<div style="text-align:center;">
<input class="makePaymentInput" type="submit" value="Make a Payment" />
</div>
</form>
More details :
Since in the logic you then redirect to a new page to collect payment information, you don't want to give the user the opportunity to mess with your model, thus you should query your customer data from your Context instead of trusting what is submitted in the POST.
Thus all you really need to add if this :
#using (Html.BeginForm("MakePayment2", "Customer", FormMethod.Post))
{
#Html.HiddenFor(model => model.{ID Field})
<div style="text-align:center;">
<input class="makePaymentInput" type="submit" value="Make a Payment" />
</div>
}
This way, you will be able to get your model back in the server side code.

Basically, your form submits nothing as there are no input fields inside the form scope. Try to wrap all your html in AccountScreen.cshtml within #using (Html.BeginForm( statement (and throw it out from MakePayment.cshtml).