I have a Kendo ComboBox as an EditorTemplate for nullable IDs (people). I bind the model normally with a UIHint
#Html.Kendo().ComboBoxFor(x=>x.Person.MotherID)
The combo works great, I can type and it filters on the server.
The problem is that when the form first loads, the ID of the person appears as the visible text, not the name.
There are 1 million records, so I can't send them all to the combobox initially.
How do I get the combobox, when it first renders, to go get the name of the person via Ajax and not show the ID?
#(Html.Kendo()
.ComboBoxFor(m => m)
.DataTextField("Name")
.DataValueField("Value")
.AutoBind(true)
.ValuePrimitive(true)
.Filter(FilterType.Contains)
.Placeholder(Words.Type_Name)
.MinLength(2)
.DataSource(source =>
source.Read(read =>
read.Action("ReadComboBoxPerson", "Picker", new { area = "" }))
.ServerFiltering(true))
)
MVC:
public ActionResult ReadComboBoxPerson(string text)
{
return Json(_personManager.PersonGetter(text), JsonRequestBehavior.AllowGet);
}
I am trying to implement kendo ui combobox instead of normal dropdownlistfor. So, in my razor view, I replaced the code
#Html.DropDownList("clientid", (IEnumerable<SelectListItem>)clientList, "-- Select --", new { id="ddClients", name="ddClients"})
with
#(Html.Kendo().ComboBox()
.Name("ddClients")
.Filter("contains")
.Placeholder("-- Select --")
.DataTextField("Text")
.DataValueField("Value")
.BindTo((IEnumerable<SelectListItem>)clientList)
)
however in my controller
[HttpPost]
public ActionResult ClientDashboard(tblclient objClient, String submitButton)
{
...
}
I am not getting the client into tblclient object!
Please help.
Change your controller to this
[HttpPost]
public ActionResult ClientDashboard(int ddClients, String submitBUtton)
{
}
You can also bind the selected value directly to the view model.
For example:
Add the id to your model:
public Int32? ClientID {get; set;}
Add a hidden field to your view:
#Html.HiddenFor(x => x.ClientID)
Add a click event to assign the ClientID to the hidden field:
$("#submitButton").on("click", function () {
var combo = $("#ddClients").data("kendoComboBox");
$("#ClientID").val(combo.value());
});
Update: I just noticed that all you have to do is change the name of the combobox to ClientID and the value is bound to the view model without the hidden field and javascript.
I want to create an empty dropdown list that has just default value.I use the following code:
#Html.DropDownList("parent","--Select Parent--")
But in running time I see this error:
There is no ViewData item of type 'IEnumerable' that
has the key 'parent'.
How can I solve it?
Thanks.
You can build an empty DropDownList like this:
#Html.DropDownList("parent", Enumerable.Empty<SelectListItem>(), "--Select Parent--")
Reference: Build an empty MVC DropdownListFor for a Cascade Sub-List
Adding html attributes to the above example:
#Html.DropDownList("Idparent", Enumerable.Empty<SelectListItem>(), "Select one...", new {#class="form-control"})
You may simply create an HTML Select option in your view.
<select id="parent" name="parent">
<option value="">Select parent </option>
</select>
EDIT : As per the comment.
When you submit the form, You can get the selected value by either having a parameter with parent name
[HttpPost]
public ActionResult Create(string parent,string otherParameterName)
{
//read and save and return / redirect
}
OR have a parent property in your ViewModel which you are using for Model binding.
public class CreateProject
{
public string parent { set;get;}
public string ProjectName { set;get;}
}
and in your action method.
[HttpPost]
public ActionResult Create(CreateProject model)
{
// check model.parent value.
}
You can do something like this in your controller to build a empty dropdown list
ViewBag.ClassID = new SelectList(db.Classes.Where(c => c.ClassID == 0) , "ClassID", "ClassName").ToList();
I use MVC 3 in ASP.Net my web app is design with ViewModel and ViewModel builder.
I use a Builder class to populate some data in a ViewModel. In my case I have a Create View a DropDownList, with this code work fine. My problem is when trying to create an Edit View, I receive this error:
{"The ViewData item that has the key 'CandidateId' is of type 'System.Int32' but must be of type 'IEnumerable<SelectListItem>'."}
My idea it would be to populate a DropDownList with some value but have pre-selected one as for databse record.
So How to display a DropDownList in a Edit View with selected a value from a DataBase?
VIEW
<div class="editor-label">
#Html.LabelFor(model => model.CandidateId)
</div>
<div class="editor-field">
#Html.DropDownListFor(x => x.CandidateId, Model.CandidatesList, "None")
</div>
VIEW MODEL
public Nullable<int> CandidateId { get; set; }
public IEnumerable<SelectListItem> CandidatesList;
VIEW MODEL BUILDER
// We are creating the SelectListItem to be added to the ViewModel
eventEditVM.CandidatesList = serviceCandidate.GetCandidates().Select(x => new SelectListItem
{
Text = x.Nominative,
Value = x.CandidateId.ToString()
});
The reason for this error is because in your [HttpPost] action you forgot to repopulate the CandidatesList property on your view model from the database.
[HttpPost]
public ActionResult Edit(EventEditVM model)
{
if (ModelState.IsValid)
{
// the model is valid => do some processing here and redirect
// you don't need to repopulate the CandidatesList property in
// this case because we are redirecting away
return RedirectToAction("Success");
}
// there was a validation error =>
// we need to repopulate the `CandidatesList` property on the view model
// the same way we did in the GET action before passing this model
// back to the view
model.CandidatesList = serviceCandidate
.GetCandidates()
.Select(x => new SelectListItem
{
Text = x.Nominative,
Value = x.CandidateId.ToString()
});
return View(model);
}
Don't forget that only the selected value of the dropdown list is sent to the server when you submit the form. The CandidatesList collection property will be null inside your POST controller action because its values were never sent. So if you intend to redisplay the same view you need to initialize this property because your view depends on it.
I have an editor template for a custom object. Inside that editor template I use a couple of DropDownListFor helpers. In each of them I specify a unique model property (with the pre-selected value) and the select list containing all the select options.
Example:
<%=Html.DropDownListFor(m => m.DocumentCategoryType, Model.DocumentCategoryTypeList) %>
I know that the option values are being populated (from viewing source) and that my Model is passed in with the correct ID value (DocumentCategoryType).
When the view is rendered, there is no selected item in my dropdown and therefore it defaults to the first (non-selected) value.
Does anyone have any ideas?
Thanks.
We also solved the solution by populating a new SelectList that has the appropriate SelectListItem selected, but created this extension method to keep the call to DropDownListFor a little cleaner:
public static SelectList MakeSelection(this SelectList list, object selection)
{
return new SelectList(list.Items, list.DataValueField, list.DataTextField, selection);
}
Then your DropDownListFor call becomes:
<%= Html.DropDownListFor(m => m.DocumentCategoryType, Model.DocumentCategoryTypeList.MakeSelection(Model.DocumentCategoryType)) %>
Looking through the ASP.NET MVC 2 source code reveals some solutions to this problem. Essentially, any SelectListItem in the SelectList passed in the helper extension method that has the Selected property set to true does not have any bearing over the <option> element rendered with the selected attribute applied for the item.
The selected attribute on <option> elements is determined by
1) checking that the helper extension method was passed a SelectList. If this is null, the framework will look in the ViewData for a value corresponding to the key that is the view model property for which you wish to render the drop down list for. If the value is a SelectList, this will be used to render the <select> including taking any selected values, so long as the model state for the model property is null.
2) If a SelectList has been passed in the helper extension method and the model state for the model property is null, the framework will look in the ViewData for a default value, using the model property name as the key. The value in view data is converted to a string and any items in the SelectList passed to the helper extension method that have a value (if no value is set, then the Text will be checked) that matches the default value will have the Selected property set to true which in turn will render an <option> with the attribute selected="selected".
Putting this together, there are two plausible options that I can see to have an option selected and use the strongly typed DropDownListFor:
Using the following view model
public class CategoriesViewModel
{
public string SelectedCategory { get; private set ; }
public ICollection<string> Categories { get; private set; }
public CategoriesViewModel(string selectedCategory, ICollection<string> categories)
{
SelectedCategory = selectedCategory;
Categories = categories;
}
}
Option 1
Set a value in the ViewData in the controller rendering your view keyed against the property name of the collection used to render the dropdown
the controller action
public class CategoriesController
{
[HttpGet]
public ViewResult Select()
{
/* some code that gets data from a datasource to populate the view model */
ICollection<string> categories = repository.getCategoriesForUser();
string selectedCategory = repository.getUsersSelectedCategory();
CategoriesViewModel model = new CategoriesViewModel(selectedCategory, categories);
this.ViewData["Categories"] = selectedCategory;
return View(model);
}
[HttpPost]
public ActionResult Select(CategoriesViewModel model)
{
/* some code that does something */
}
}
and in the strongly typed view
<%: Html.DropDownListFor(m => m.Categories, Model.Categories.Select(c => new SelectListItem { Text = c, Value = c }), new { #class = "my-css-class" }) %>
Option 2
Render the dropdown using the name of the property of the selected item(s)
the controller action
public class CategoriesController
{
[HttpGet]
public ViewResult Select()
{
/* some code that gets data from a datasource to populate the view model */
ICollection<string> categories = repository.getCategoriesForUser();
string selectedCategory = repository.getUsersSelectedCategory();
CategoriesViewModel model = new CategoriesViewModel(selectedCategory, categories);
return View(model);
}
[HttpPost]
public ActionResult Select(CategoriesViewModel model)
{
/* some code that does something */
}
}
and in the strongly typed view
<%: Html.DropDownListFor(m => m.SelectedCategory, Model.Categories.Select(c => new SelectListItem { Text = c, Value = c }), new { #class = "my-css-class" }) %>
It is confirmed as a bug # aspnet.codeplex.com
and only behaves like this for strongly typed views.
Workaround: populate your SelectList in the view code
like
<%= Html.DropDown("DocumentCategoryType", new SelectList(Model.Categories,"id","Name",Model.SelectedCategory")) =>
Yuck. I ended up solving it like this. I hope this gets fixed for RTM.
<%if(Model!=null){ %>
<%= Html.DropDownListFor(m => m.DocumentCategoryType, new SelectList(Model.DocumentCategoryTypeList,"Value","Text", Model.DocumentCategoryType))%>
<%}else{%>
<%=Html.DropDownListFor(m => m.DocumentCategoryType, Model.DocumentCategoryTypeList) %>
<%}%>
Make sure you have a value assigned to m.DocumentCategoryType when you send it to the view.
Generally this value will get reset when you do a post back so you just need to specify the value
when returning to your view.
When creating a drop down list you need to pass it two values. 1. This is where you will store the selected value 2. Is the actual List
Example
<%=Html.DropDownListFor(m => m.DocumentCategoryType, Model.DocumentCategoryTypeList) %>
I made the mistake of setting the select list item Selected value to True. This won't do anything. Instead just assign a value to m.DocumentCategoryType in your controller and this will actually do the selection for you.
Here's another good solution if the source for your drop down list is an IEnumerable instead of a SelectList:
public static SelectList MakeSelection(this IEnumerable<SelectListItem> list, object selection, string dataValueField = "Value", string dataTextField = "Text")
{
return new SelectList(list, dataValueField, dataTextField, selection);
}
Model.DocumentCategoryTypeList
This is probably your problem. On the SelectListItems, do you set the value to the .ToString() output?
var list = new List<SelectListItem>()
{
new SelectListItem()
{
Value = Category.Book.ToString(),
Text = "Book"
},
new SelectListItem()
{
Value = Category.BitsAndPieces.ToString(),
Text = "Bits And Pieces" },
new SelectListItem()
{
Value = Category.Envelope.ToString(),
Text = "Envelopes" }
};
Works for me after doing that. It just needs to be able to match the value from the object
I managed to solve the same problem by saying the folling:
new SelectList(sections.Select(s => new { Text = s.SectionName, Value = s.SectionID.ToString() }), "Value", "Text")
This trick is converting to the value to a string. I know this has been mentioned in previous answers but i find my solution a little cleaner :). Hope this helps.
Copied na pasted from my project:
<%= Html.DropDownListFor(m => m.Profession.Profession_id, new SelectList(Model.Professions, "Profession_id", "Profession_title"),"-- Profession --")%>
Model that is passed:
...
public Profession Profession { get; set; }
public IList<Profession> Professions { get; set; }
...
Html generated:
<select id="Profession_Profession_id" name="Profession.Profession_id">
<option value="">-- Profesion --</option>
<option value="4">Informatico</option>
<option selected="selected" value="5">Administracion</option>
</select>
Works for me. I have this on the form and the only disadvantage is that if model is not valid and I return the model back to the view I have to reload the list of Professions.
obj.Professions = ProfileService.GetProfessions();
return View(obj);
I also had this problem with a field ProgramName. Turns out we used ViewBag.ProgramName in the BaseController and Layout.cshtml, and this was for a different purpose. Since the value in ViewBag.ProgramName was not found in the dropdownlist, no value was selected even though the SelectListItem.Selected was true for one item in the list. We just changed the ViewBag to use a different key and the problem was resolved.
Here is a drop-in DropDownListFor replacement that varies only slightly from the original MVC source.
Example:
<%=Html.FixedDropDownListFor(m => m.DocumentCategoryType,
Model.DocumentCategoryTypeList) %>
I was worried about the performance of making so many copies of my selectList, so instead, I added the selectedvalue as a custom attribute, then used jquery to actually perform the item select:
#Html.DropDownListFor(item => item.AttendeeID, attendeeChoices, String.Empty, new { setselectedvalue = Model.AttendeeID })
........
jQuery("select[setselectedvalue]").each(function () { e = jQuery(this); e.val(e.attr("setselectedvalue")); });