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Send Selected DropDownList value to HomeController ActionResult

Hi I have a drop down list that is filled in from comma delimited values in the config. This works fine.
What I am trying to do is to send the selected value on button click to a ActionResult in the HomeController.
I created a Model, which is taking a string. When I hit the button I get error:
The view 'TestAction' or its master was not found or no view engine supports the searched locations.
This is what my Controller looks like:
[HttpPost]
[ActionName("TestAction")]
public ActionResult TestAction(SQL_Blocks_App.Models.DropdownList SelectedValue)
{
//System.Diagnostics.Debug.WriteLine(SelectedValue);
return View();
}
This is what my model looks like:
public class DropdownList
{
//
// GET: /DropdownList/
[Display(Name = "Servers")]
public string SelectedValue{ get; set; }
}
and this is what my Index View looks like:
<form id="SelectedValue" action="/Home/TestAction" method="post" style="margin: 0">
<div class="col-lg-5">
#{
ViewBag.Title = "Index";
}
#Html.DropDownList("YourElementName", (IEnumerable<SelectListItem>)ViewBag.DropdownVals, "--Choose Your Value--", new
{
//size = "5",
style = "width: 600px"
})
</div>
<div class="col-lg-5">
<input type="submit" value="Run Query" />
<input id="Button2" type="button" value="Clear" onclick="window.location.reload()" />
</div>
</form>
I want to clarify. My end goal is to use the selected value in a SQL query in the ActionResult and return the results back to the index so I can fill them in a table. ( You don't have to show me how to do the SQL part for now I just would like to see the selected value at least printed in the output.)

Redirect to index action, and pass the parameters along
[HttpPost]
[ActionName("TestAction")]
public ActionResult TestAction(SQL_Blocks_App.Models.DropdownList _selectedValue)
{
//System.Diagnostics.Debug.WriteLine(SelectedValue);
return RedirectToAction("Index", "[Controller]", new {#_selectedValue = _selectedValue });
}
and then your Index method should accept the parameter.
[HttpGet]
public ActionResult Index(SQL_Blocks_App.Models.DropdownList _selectedValue)
{
//use _selectedValue
}
I would recommend using another method other than your index, or make Dropdownlist nullable/set a default for it.

The default framework behavior of return View() is to return a view with the same name as the currently-executing action. Which is TestAction. The error is telling you that no such view was found.
You have a couple of options. You can either create the view, or you can return something else. For example, if you want to redirect back to the Index then you can return a redirect result:
return RedirectToAction("Index");
You could also specify the Index view in the response:
return View("Index");
However, keep in mind that the URL will still be for TestAction and not for Index, which could result in unexpected changes to behavior if you're not aware of this.
Edit: Based on comments on this answer, it sounds like what you actually want is to build a pair of actions which generally operate on the same view. This isn't particularly common for an index view, but is very common for edit views. The only difference is semantics, structurally the concept works anywhere.
Consider two actions:
public ActionResult Index()
{
// just show the page
return View();
}
[HttpPost]
public ActionResult Index(SQL_Blocks_App.Models.DropdownList SelectedValue)
{
// receive data from the page
// perform some operation
// and show the page again
return View();
}
Requests between these two actions would differ only by the HTTP verb (GET or POST), not by the action name on the URL. That name would always be "Index". But when the form on the index view is submitted via POST and has a "SelectedValue", the second action is invoked instead of the first.
In that second action you would perform your database interaction, gather whatever data you needed, and if necessary include a model or some additional data in the response.

You TestAction method is returning to a View. Make sure View TestAction.cshtml exists and is in the Home folder.

how i can bind data to model with post method asp.mvc [duplicate]

I want to send a message to userID=3 by going to /MyController/Message/3
This executes Message() [get] action, I enter some text in the text area and click on Save to post the form
Message() [post] action saves the changes, resets the value of SomeText to empty string and returns to the view.
At this point I expect the text area to be empty because I have set ViewData["SomeText"] to string.Empty.
Why is text area value not updated to empty string after post action?
Here are the actions:
[AcceptVerbs(HttpVerbs.Get)]
public ActionResult Message(int ID)
{
ViewData["ID"] = ID;
return View();
}
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Message(int ID, string SomeText)
{
// save Text to database
SaveToDB(ID, SomeText);
// set the value of SomeText to empty and return to view
ViewData["SomeText"] = string.Empty;
return View();
}
And the corresponding view:
<%# Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master"
Inherits="System.Web.Mvc.ViewPage" %>
<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">
<% using (Html.BeginForm())
{ %>
<%= Html.Hidden("ID", ViewData["ID"])%>
<label for="SomeText">SomeText:</label>
<%= Html.TextArea("SomeText", ViewData["SomeText"]) %>
<input type="submit" value="Save" />
<% } %>
</asp:Content>

The problem is that your ModelState is re-filled with the posted values.
What you can do is clear it on the Action that has the Post attribute :
ModelState.Clear();

The problem is the HtmlHelper is retrieving the ModelState value, which is filled with the posted data. Rather than hacking round this by resetting the ModelState, why not redirect back to the [get] action. The [post] action could also set a temporary status message like this:
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Message(int ID, string SomeText)
{
// save Text to database
SaveToDB(ID, SomeText);
TempData["message"] = "Message sent";
return RedirectToAction("Message");
}
This seems to me like more correct behaviour.

The html helpers read the value from the ModelState. And there's no elegant way to override this behaviour.
But if you add this line after SaveToDB(ID, SomeText), it should work :
ModelState["SomeText"].Value =
new ValueProviderResult("", "", CultureInfo.CurrentCulture);

I tried everything, but only worked when I did something like this:
ModelState.Clear();
//This will clear the address that was submited
viewModel.Address = new Address();
viewModel.Message = "Dados salvos com sucesso!";
return View("Addresses", ReturnViewModel(viewModel));
Hope this helps.

Instead of using ModelState.Clear() which clears the whole modelstate, you can do ModelState.Remove("SomeText"), if you want to. Or render the Input without the htmlhelper-extensions.
They are designed to take the Value from ModelState instead of the Model (or viewdata).

That is a clientside behavior. I would recommend using javascript. If you use JQuery, you can do it like this:
<script type="text/javascript">
$(function(){ $("#SomeText").val("");});
</script>
I don't use Javascript anymore, but I believe in regular JS that it is like:
document.getElementById("SomeText").value = "";
(You would do this on one of the load events.
<body onload="...">
Hope this helps.

I am fairly certain the textarea is grabbing the value from the Request.Form under the hood since ViewData["SomeText"] is empty.

Is it possible that the model state has been updated with an error? I believe that it will pull the attempted value from the model state rather than from view data or the model if the model state isn't valid.
EDIT:
I'm including the relevant section of the source code from the TextArea HtmlHelper extension below. It appears to me that it does exactly what I expected -- if there has been a model error, it pulls the value from the model state, otherwise it uses it from ViewData. Note that in your Post method the "SomeText" key shouldn't even exist until you set it, i.e., it won't be carried forward from the version of the code that responds to the GET.
Since you explicitly supply a value to the ViewData, useViewData should be false, attemptedValue should be false unless an error has been set in the model state.
// If there are any errors for a named field, we add the css attribute.
ModelState modelState;
if (htmlHelper.ViewData.ModelState.TryGetValue(name, out modelState)) {
if (modelState.Errors.Count > 0) {
tagBuilder.AddCssClass(HtmlHelper.ValidationInputCssClassName);
}
}
// The first newline is always trimmed when a TextArea is rendered, so we add an extra one
// in case the value being rendered is something like "\r\nHello".
// The attempted value receives precedence over the explicitly supplied value parameter.
string attemptedValue = (string)htmlHelper.GetModelStateValue(name, typeof(string));
tagBuilder.SetInnerText(Environment.NewLine + (attemptedValue ?? ((useViewData) ? htmlHelper.EvalString(name) : value)));
return tagBuilder.ToString(TagRenderMode.Normal);

Do s.th. like this:
add:
ModelState.Clear();
before the return statement of the submit buttons action method. Works for me. It could work for you.

Need to pass the Rowdata to another view on link click

Here is my JQGrid Code:
click: function (e) {
debugger;
var id = $(e.target).closest("tr.jqgrow").attr("id");
rowdata = jQuery("#EmpTable").getRowData(id);
Data = { Id: rowdata.Id, Name: rowdata.Name, Designation: rowdata.Designation };
var url = 'http://localhost:50428/Script/Edit/';
return $.post(url, Data);
}
here is my controller code where the data is collecting
[HttpPost]
public ActionResult Edit(FormCollection form)
{
gridmodel properties = new gridmodel();
properties.Id = Convert.ToInt32(form["id"]);
properties.Name = form["Name"];
properties.Designation = form["Designation"];
ViewBag.id = properties.Id;
ViewBag.name = properties.Name;
ViewBag.designation = properties.Designation;
return View();
}
Now here is my View code
the data that is passing from the controller to the view
#model MVC5_JQGrid.Models.gridmodel
#{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Edit</title>
</head>
<body>
<div>
Id:#ViewBag.id
<br />
Name:#ViewBag.name
<br />
Designation:#ViewBag.designation
</div>
</body>
</html>
But i am unable to load this page but in network ---> Response body i can see that these values are assigned
Update
Hello Venkata thanks for the answer i will keep the points which you mentioned and +1 from my side for the observation ,coming to the problem. it was resolved from oleg suggestion:(Here is the answer given by Oleg) The reason of your problem is the usage of $.post(url, Data); which just send data with respect of $.ajax({url: "/Script/Edit", data: Data, type: "POST"});. You need to do $.submit instead. If you would use HTTP GET then you can just assign new URL which includes parameters to location.href (something like location.href = "/Script/Edit?" + $.param(Data)). In case of HTTP POST one need to build with elements which contains (or just have on the page hidden form with all required elements with required name attributes) and use $.submit.
Thanks for the help from oleg and Venkata

Few Changes required in your code:
Observation and Notes:
Before fixing, we should know few points here regarding architecture, control-flow and standards
jQuery AJAX requests get response to its success callback handler(in your code you've missed success call)
In success function We should build or append or set HTML to target placeholder tag in existing page (let us say you have div for Edit section like <div id='editSection'>...</div> in your jqGrid page. you should bind the responseView to editSection div)
When we send AJAX request: In Controller.Action Instead of return View(); we should have return PartialView();
In your view.cshtml give preference to bind elements with Model rather than ViewData. You can get model to view if you do return PartialView(model); in the Action.
Try to reduce usage of ViewData or ViewBag in view.cshtml. Also business logic not recommended in Views.
Try to Follow best practices: Capitalization Conventions (in your code change gridmodel class name to GridModel)
By default routing url template will have {controller}/{action} (from your url Script is controller and Edit is action)
Make sure that you're passing correct Controller and Action names (Is Edit action located in the Controller with name ScriptController?)
Changes in JavaScript JQGrid Code:
url = '/Script/Edit/';
return $.post(url, Data).success(function(response){
//response datatype can be JSON or XML or HTML or text (In your case HTML Edit.cshtml View)
//update you target html tag with response view.
$('#editSection').html(responseView);
});
Changes in Controller:
[HttpPost]
public ActionResult Edit(FormCollection form)
{
var properties = new gridmodel();
properties.Id = Convert.ToInt32(form["id"]);
properties.Name = form["Name"];
properties.Designation = form["Designation"];
ViewBag.id = properties.Id;
ViewBag.name = properties.Name;
ViewBag.designation = properties.Designation;
return PartialView();
}
You can change above Edit Action like below if action require input parameters only id, name & designation
[HttpPost]
public ActionResult Edit(int id, string name, string designation)
{
var gridModel = new GridModel();
gridModel.Id = id;
gridModel.Name = name;
gridModel.Designation = designation;
ViewBag.id = gridModel.Id;
ViewBag.name = gridModel.Name;
ViewBag.designation = gridModel.Designation;
return PartialView(gridModel);
}

Hello Venkata thanks for the answer i will keep the points which you mentioned and +1 from my side for the observation ,coming to the problem. it was resolved from oleg suggestion:(Here is the answer given by Oleg) The reason of your problem is the usage of $.post(url, Data); which just send data with respect of $.ajax({url: "/Script/Edit", data: Data, type: "POST"});. You need to do $.submit instead. If you would use HTTP GET then you can just assign new URL which includes parameters to location.href (something like location.href = "/Script/Edit?" + $.param(Data)). In case of HTTP POST one need to build with elements which contains (or just have on the page hidden form with all required elements with required name attributes) and use $.submit. Thanks for the help from oleg and Venkata

Multiple actions on the same controller and view in asp.net MVC

How do I use multiple actions on the same controller?
I'm using the default project that comes up when opening a new project in asp.net mvc.
I added one more Index action on the homecontroller to accept a value from a textbox...like this
string strTest;
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Index(FormCollection frm)
{
strTest = frm["testbox"];
return RedirectToAction("Index");
}
Now,I need to display the entered value back to the user. How do I do this?
I tried this..
public ActionResult Index()
{
this.ViewData.Add("ReturnMessage", strValue);
return View();
}
Here's what I've put on my view..
<% using (Html.BeginForm())
{ %>
<p>
<%=Html.TextBox("testbox")%>
</p>
<p>
<input type="submit" value="Index" /></p>
<p>
<%= Html.ViewData["ReturnMessage"] %>
</p>
<% } %>
the compiler typically doesn't let me add another index with same constructor to display the entered message back to the user which is obvious in c# I know. But,then how do I get the message back out to the user.
Thanks

Well, a controller matches one route, based on the parameters sent. You can layer your routes from most specific to least specific, it checks in order. First one that hits wins.
The other answer is to either strongly type your model sent to your view, or store it in the ViewData:
ViewData["Message"] = "Welcome to ASP.NET MVC!";
Then access it in your View:
<%= Html.Encode(ViewData["Message"]) %>

Simple method
In your view
<% using (Html.BeginForm()) {%>
<%= Html.TextBox("myInput") %>
<%= ViewData["response"] %>
<%}%>
In your controller;
public ActionResult Index()
{
return View();
}
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Index(FormCollection collection)
{
ViewDate.Add("response", collection["myInput"]);
return View();
}

Josh, see the previous question you asked.
In there I had <%= Html.textbox("myInput", Model.myInput....
it's the Model.myInput that will put the value from your model into the text of yoru text box.
EDIT
Or if you don't want it in a text box then simply do;
EDIT 2
You can add as many items into your new form view model and it has, in this case, nothing to do with a database. see your previous question on where i declared the class.
the class can have as many properties as you like. So you can add a string myResponse {get;set;} to return a response back to your view so then you can use <%=Model.myResponse%>
Hope this helps.

Passing data from View to Controller

In an ASP.NET MVC application, I'm making logic for Admin to accept or reject new members. I'm showing a list of members and two buttons Accept and Reject, like this:
<% foreach (var mm in (ViewData["pendingmembers"] as List<MyMember>)) %>
<% { %>
<tr><td>Username:<%=mm.UserName %></td><td>
<tr><td>Firstname:<%=mm.FirstName %></td><td>
...etc...
<tr>
<td>
<% using (Html.BeginForm("AcceptPendingUser", "Admin"))
{ %>
<input type="submit" value="Accept" />
<% } %>
</td>
<td>
<% using (Html.BeginForm("RejectPendingUser", "Admin"))
{ %>
<input type="submit" value="Reject" />
<% } %>
</td>
</tr>
<% } %>
So, the list of pending member data is in a list of MyMember-objects. Each MyMember object will be printed out member and two buttons are setup for the admin to either accept or reject a pending member.
Then, in the controller I'm separating the handling of those two input fields/forms, like this:
public ActionResult AcceptPendingUser()
{
// TODO: Add code to save user into DB and send welcome email.
return RedirectToAction("Index");
}
public ActionResult RejectPendingUser()
{
// TODO: Add code to remove user from PendingUsers list and send rejection email.
return RedirectToAction("Index");
}
I would like to directly get the object next to the button the user pressed.
How can I send the MyMember object from the View to the controller?
Or how do I send perhaps a numeric index with button press? Maybe with a hidden field?

The simplest option would probably be a hidden input:
<input type="hidden" value="<%=mm.Key%>" name="key" id="key" />
(name accordingly; in each form)
The two controller would then take an argument called "key" (rename to suit). If you want to parse the object from multiple inputs, you'll need a ModelBinder. Of course, rather than 2*n forms, you might consider either query-string based urls, or use something like jQuery (or some other script helper) to submit the data without needing the forms (if script is available).

Instead of using an HTML button consider using an ActionLink and construct it to include the id of the member being approved. Another alternative would be to have a checkbox (whose value is the id of the member being approved) that the admin can select for each member to be approved and a similar one for reject and one each approve/reject buttons for the entire form.

Answering to myself and other mvc newbies:
I got it finally working with this code:
VIEW:
<%=Html.ActionLink(
"Jump",
"Jump",
new { name=(ViewData["Person"] as Person).Name,
person=ViewData["Person"]},
null) %>
CONTROLLER:
public ActionResult Index()
{
ViewData["Title"] = "Home Page";
ViewData["Message"] = "Welcome to ASP.NET MVC!";
Person p = new Person();
p.Name = "Barrack";
p.Age = 35;
ViewData["Person"] = p;
return View();
}
public ActionResult Jump(string name, Person person)
{
return View();
}
Debugging the app in the Jump method gives me nice "Barrack"-string for the name parameter, but Person parameter in null.
I also understand what the kind commenters tried to explain: it's easy to send simple data types like strings and ints to controller, but complex types such as my Person object needs something else.
Basically passing an int is enough for me. The hardest part here was figuring out the right way to set up ActionLink.
Cheers,
Pom