I'm using C#.NET MVC3 (Razor) to create a simple form. But in that form i need to print the content of a list in the form of radiobuttons. But i'm not sure how this works:
#using(Html.BeginForm("Method", "Controller", FormMethod.Post))
{
foreach (Items item in Model.Items)
{
<div>
#Html.RadioButtonFor(item->itemId)
#Html.LabelFor(item->description)
</div>
}
}
But this doesn't work.
I can probably use normal html tags to create the radio buttons. But then the data won't be auto saved in the right?
How can i make this work?
I would recommend you using editor templates instead of writing those loops:
#model MyViewModel
#using(Html.BeginForm("Method", "Controller", FormMethod.Post))
{
#Html.EditorFor(x => x.Items)
}
and now define a corresponding editor template which will automatically be rendered for each element of the model (~/Views/Shared/EditorTemplates/ItemViewModel.cshtml):
#model ItemViewModel
<div>
#Html.RadioButtonFor(x => x.itemId, "1")
#Html.LabelFor(x => x.description)
</div>
Notice that you must pass a second argument to the Html.RadioButtonFor helper in addition to the lambda expression that picks the corresponding view model property. This argument represents the value that will be sent to the server and bound to the corresponding property if the user checks this radio button when the form is submitted.
Also notice that this works by convention. If we assume that the Items property in your main view model is of type IEnumerable<ItemViewModel> then the corresponding editor template that you must define and which will be rendered for each element of this collection is ~/Views/Shared/EditorTemplates/ItemViewModel.cshtml or ~/Views/CurrentController/EditorTemplates/ItemViewModel.cshtml if you don't want this template to be shared between multiple controllers.
As you are inside foreach loop. following will work.
foreach (Items item in Model.Items)
{
<div>
#Html.RadioButtonFor(item.itemId)
#Html.LabelFor(item.description)
</div>
}
If you want to save them all you need to implement zero index based solution as follows
#{int i = 0}
foreach (Items item in Model.Items)
{
<div>
#Html.RadioButtonFor(model =>model[i].itemId)
#Html.LabelFor(model =>model[i].description)
</div>
i++;
}
The syntax is a bit different:
#Html.RadioButtonFor(model => item.ItemId)
#Html.LabelFor(model => item.Description)
Everything else looks fine.
[EDIT] Whoa, I must be tired. Yeah, the following looks just fine, but only for display. Check the Darin's answer for editor template.
[EDIT2] It's not quite obvious from the question, but it seems from your comments that the item in the foreach is another Enumerable. Nest the foreach loops then, to display the properties:
#foreach(var itemList in Model.Items)
{
foreach(var item in itemList)
{
<div>
#Html.RadioButtonFor(model => item.ItemId)
#Html.LabelFor(model => item.Description)
<div>
}
}
Is that it? I'm still not sure if I understand it correctly. :)
Related
I've searched around and can't find an answer to my problem.
I've got a View that takes accepts Foo in like so:
#model IEnumerable<MyApplication.Models.Foo>
Inside of the view I've got a table. I populate the the table just doing a simple foreach loop through my Foo model. I have added a column where a user can add details to each row in a text area and save.
So the view looks like this:
#foreach (var item in Model)
{
<tr>
<th>
#using (Html.BeginForm("AddDetails", "MyController", FormMethod.Post))
{
#Html.AntiForgeryToken()
#Html.HiddenFor(u => item.Id)
#Html.TextAreaFor(u => item.Details, new { #class = "form-control" })
<input type="submit" value="Save" class="btn btn-sm btn-default" />
}
</th>
</tr>
}
My controller is setup like this:
[HttpPost]
public ActionResult AddDetails(Foo foo)
{
}
When I set a breakpoint on that controller foo always has null values for the Details property and the Id is always 0. When it's passed into the view it's got all of the properties set to right, so I'm not sure why it is not posting back properly?
I've tried this:
#using (Html.BeginForm("AddDetails", "MyController", FormMethod.Post, new { foo = Model }))
I have also tried removing the foreach loop and changing it to pass in just a single Model to the View and for the View to accept just the single model instead of an IEnumerable. When I do this it posts back just fine.
And that does not work either. I'm wondering if it has something to do with the fact that my form is within a foreach loop and perhaps I need to do a little more work like add a data-id attribute to the element and just capture the click event on the button and do an AJAX call to the controller and pass the right values along that way?
EDIT Sorry I completely forgot the view model. Here is what that looks like:
public class Foo
{
public int Id { get; set; }
public string Details { get; set; }
}
Generally speaking it's bad form to post to a different model than what your form view is composed from. It makes a lot of things difficult, not the least of which is recovering from validation errors.
What you're doing here is looping through a list of Foo and creating multiple forms that will each submit only a single Foo to an action that takes only a single Foo. While the post itself is fine, using the *For helpers on a model that is not the same as what you're posting to will likely not generate the proper input names necessary for the modelbinder to bind the posted values onto that other model. At the very least, if you need to return to this view because of a validation error, you will not be able to keep the user's posted data, forcing them to repeat their efforts entirely.
Ideally, you should either post the entire list of Foo and have just one form that wraps the iteration (in which case, you would need to use for rather than foreach). Or you should simply list the Foos with a link to edit a particular Foo, where you would have a form for just one Foo.
try to do this.possible problems
form should outside the table
single form for whole table
wrap your column editor inside tbody not thead
#using (Html.BeginForm("AddDetails", "MyController", FormMethod.Post))
{
//thead and tbody
}
Since no answer was reported for testing the for loop instead of foreach.
I was stuck all day yesterday using foreach loop and always got 0 items in the post method. I changed to for loop and was able to receive the updated items in the post method.
For reference I am using asp.net core 3.2
This is the foreach loop:
#{
foreach(var role in #Model.RolesList)
{
<div class="btn-check m-1">
<input type="hidden" asp-for="#role.RoleId" />
<input type="hidden" asp-for="#role.RoleName" />
<input asp-for="#role.IsSelected" class="form-check-input" />
<label class="form-check-label" asp-for="#role.IsSelected">#role.RoleName</label>
</div>
}
}
This is the for loop:
#for(int i = 0;i< Model.`enter code here`RolesList.Count();i++)
{
<div class="btn-check m-1">
<input type="hidden" asp-for="RolesList[i].RoleId" />
<input type="hidden" asp-for="RolesList[i].RoleName" />
<input asp-for="RolesList[i].IsSelected" class="form-check-input" />
<label class="form-check-label" asp-for="RolesList[i].IsSelected">#Model.RolesList[i].RoleName</label>
</div>
}
This has been a thorn in my side for a while. If I use EditorFor on an array of objects and the editor Template has a form in it ex.
public class FooController:Controller {
public ActionResult Action(Foo foo) {
// ...
}
}
Index.cshtml
#model IEnumerable<Foo>
#Html.EditorFor(m=> m)
EditorTemplate
#model Foo
#using (Html.BeginForm("action", "controller"))
{
#Html.TextBoxFor(f=> f.A)
#Html.CheckBoxFor(f=> f.B)
#Html.LabelFor(f=> f.B)
}
So I'll hit a few problems.
The checkbox label's for doesn't bind correctly to the checkbox (This has to do with the label not receiving the proper name of the property ([0].A as opposed to A).
I'm aware I can get rid of the pre- text by doing a foreach on the model in Index but that screws up ids and naming as the framework doesnt realize there are multiples of the same item and give them the same names.
For the checkboxes I've just been doing it manually as such.
#Html.CheckBoxFor(m => m.A, new {id= Html.NameFor(m => m.A)})
<label for="#Html.NameFor(m => m.A)">A</label>
However I cant solve the inability of the controller to accept the item as a single model. I've even tried allowing an array of Foo's in the Action parameters but that only work when its the first item being edited ([0]...) if its any other item in the array (ex. [1].A) the controller doesn't know how to parse it. Any help would be appreciated.
Make your model a class with the properties you need.
create a class in your Models subfolder
public class MyModel {
public IEnumerable<Foo> Foolist { get ; set;}
public string Something { get;set;}
}
your EditorFor will have to have a foreach loop for Foolist...
MVC will attempt to put your model together from the form and return it to your POST action in the controller.
Edit:
You could create an EditorTemplate for foo. In Views/Shared/EditorTemplates folder, create FooTemplate.cs
#model Foo
<div class="span6 float-left" style="margin-bottom: 6px">
#Html.TextBoxFor(m => m.A, new { style = "width:190px" })
#Html.CheckBoxFor(m => m.B, new { style = "width:40px" })
#Html.ValidationMessage("foo", null, new { #class = "help-inline" })
</div>
then in your view
#foreach (var myFoo in Model)
{
#EditorFor(myFoo)
}
This still suffers from the "model gets passed back as a whole" requiredment of yours. Not sure about why there is a need to process these individually.
Hah finally solved this - Here's how I did it. As a bit of background HTML forms use the name attribute when submitting forms, but the label for element uses Id . so I only adapt the id tag to have the prefix and not the name tag.
--In the cshtml file
#{
var prefix = ViewData.TemplateInfo.HtmlFieldPrefix;
ViewData.TemplateInfo.HtmlFieldPrefix = "";
}
then I can specify the id for the properties by their prefix while letting the name remain the same like so
#Html.CheckBoxFor(m => m.A,
new {id = prefix+"."+ Html.NameFor(m => m.A)})
<label for="#prefix.#Html.NameFor(m => m.A)">A!</label></div>
I have around 35 radio button list values to be displayed in my view using #html.RadioButtonFor html helper in a .cshtml page.
I want to display in 9 columns and 4 rows.
In Asp.net using control properties of like "RepeatLayout", "RepeatDirection", "RepeatColumns" we could achieve this.
Same thing I want to apply it for mvc4.Is there any way to implement the same?
Please help!
Controller code:
ViewBag.Ratio = query.Select(m => new SelectListItem { Value = m.RatioID, Text = m.Ratio_Description });
.cshtml code
<td colspan="3" >
#foreach (var item in (IEnumerable<SelectListItem>)ViewBag.Ratio)
{
#Html.RadioButtonFor(m => m.RatioType, new { #item.Value, #item.Text })
<label for = "#item.Value">#item.Text</label>
}
</td>
Best way is to use table like this: http://jsfiddle.net/z2L3qbh9/1/
Or try to manage it with css like this:
.eachRadioBtn{
width:11%;
float:left;
}
wrap each radioBottuon with a div tag:
<div class=".eachRadioBtn">
#HTML.RadioButtonFor( ... )
</div>
I have a model that can have a variable amount of items in a List<T>
In my view I then have the following:
#using (Html.BeginForm())
{
int count = Model.Data.Filters.Count;
for(int i = 0; i < count; i++)
{
<div>
#Html.TextBox("filtervalue" + i)
#Html.DropDownList("filteroptions"+i,Model.Data.Filters[i].FilterOptions)
</div>
}
#Html.Hidden("LinkID", Url.RequestContext.RouteData.Values["id"])
}
Is there a way in my controller so I can set up the POST action method to bind to a model with variable items in it?
Also how would I construct the model to cope with this?
Thanks
You coud use editor templates, it will be much easier:
#using (Html.BeginForm())
{
#Html.EditorFor(x => x.Data.Filters)
#Html.Hidden("LinkID", Url.RequestContext.RouteData.Values["id"])
}
and inside the editor template (~/View/Shared/EditorTemplates/FilterModel.cshtml) which will be automatically rendered for each element of the Model.Data.Filters collection:
#model FilterModel
<div>
#Html.TextBoxFor(x => x.FilterValue)
#Html.DropDownListFor(x => x.SelectedFilterOption, Model.FilterOptions)
</div>
Now your POST controller action will simply look like this:
[HttpPost]
public ActionResult Foo(SomeViewModel model)
{
// model.Data.Filters will be properly bound here
...
}
Thanks to editor templates you no longer have to write any foreach loops in your views or worry about how to name your input fields, invent some indexed, ... so that the default model binder recognizes them on postback.
I've followed Steve Sanderson’s "Editing a variable length list, ASP.NET MVC 2-style" guide and created an MVC view to edit a list of items. Note i'm using MVC 3 so i'm not sure if there is a better way to do this. http://blog.stevensanderson.com/2010/01/28/editing-a-variable-length-list-aspnet-mvc-2-style/
The problem i have is one of the fields on my list is a dropdown list. i've managed to get the dropdown populated on each row but its not loading the selected value when the page loads. It is however saving the selected value but every time i edit the page i need to re-set all the dropdowns.
Does anyone know how to set the selected dropdown value for each "row" on the partial view?
My edit view has
#foreach (var item in Model.Roles)
{
#Html.Partial("RoleRow-Edit", item)
}
My partial view has
#using (Html.BeginCollectionItem("Roles"))
{
#Html.EditorFor(model => model.TemplateID)
#Html.DropDownList("PartyRoleID", (SelectList)ViewBag.PartyRoles)
#Html.EditorFor(model => model.DisplayName)
}
On my controller i have
ViewBag.PartyRoles = new SelectList(db.PartyRoles.OrderBy(c => c.Role), "Role", "Role");
I found a workaround : you should create the SelectList in the partial view, and set its intial value to the bounded value, so partial view will look like this :
#{var selectList = new SelectList(db.PartyRoles.OrderBy(c => c.Role),
"Role", "Role",Model.PartyRoleID);}
/*pass the db.PartyRoles.OrderBy(c => c.Role) in view bag inside controller,
it's cleaner*/
#using (Html.BeginCollectionItem("Roles"))
{
#Html.EditorFor(model => model.TemplateID)
#Html.DropDownList(model => model.PartyRoleID, selectList)
#Html.EditorFor(model => model.DisplayName)
}
I can't see anywhere in your code where you would set the PartyRoleID value. I would recommend you to use view models and strongly typed views instead of ViewBag:
#Html.DropDownListFor(x => x.PartyRoleID, Model.PartyRoles)
Now all you have to do on your controller is to set the value of your view model:
var roles = db.PartyRoles.OrderBy(c => c.Role);
var model = new MyViewModel();
// preselect the value of the dropdown
// this value must correspond to one of the values inside the roles collection
model.PartyRoleID = "admin";
model.PartyRoles = new SelectList(roles, "Role", "Role");
return View(model);
Also I would recommend you using Editor Templates and replace the following foreach loop:
#foreach (var item in Model.Roles)
{
#Html.Partial("RoleRow-Edit", item)
}
By the following:
#Html.EditorFor(x => x.Roles)
Now all that's left is to customize the corresponding editor template.