always 0 then new object

[Gusev]

Hello!
I use Combobox  with Ajax Loading.
And I have a question:
1) I have a code:

@model int

@(Html.Kendo().ComboBoxFor(x => x)
    .DataTextField("Description")
    .DataValueField("Id")
    .Placeholder("Select")
    .HtmlAttributes(new { style = "width:225px", id = Guid.NewGuid().ToString() })
    .DataSource(databinding => databinding
        .Read(read => read
        .Action("SelectComboboxItems", "Lumber")))
)

2) If I use DropDownListFor instead of ComboBoxFor...everything well works and DropDownList select OptionLabel (because I dont have item with Id = 0)
But If I use ComboboxFor...than I get this...(please see  zero.png)
Why Combobox does this?  I want that combobox set placeholder instead of 0, when I dont have item with Id=0

[Georgi Krustev]

Hello Gusev,

 
The described behavior is expected, because the ComboBox widget is designed to accept custom values. The default value of int is 0. When you create new item you will see the default value of the integer as ComboBox value. You can either make Model of the editor template Nullable<int> or to clear the value of the widget when Model is 0.

Regards,
Georgi Krustev
Telerik

[Gusev]

Thanks for your answer Georgi Krustev!
How I can do this: "Clear the value of the widget when Model is 0." 
I can subscribe on Event DataBound and then clear value, but how I can do this in EditorTemplate?

[Georgi Krustev]

Hello again Gusev,

 
I will suggest you try clear the default value of the integer using the Value method of the wrapper:

@model int

@(Html.Kendo().ComboBoxFor(x => x)
    .Value(Model == 0 ? string.Empty : Model.ToString())
    .DataTextField("Description")
    .DataValueField("Id")
    .Placeholder("Select")
    .HtmlAttributes(new { style = "width:225px", id = Guid.NewGuid().ToString() })
    .DataSource(databinding => databinding
        .Read(read => read
        .Action("SelectComboboxItems", "Lumber")))
)

Regards,
Georgi Krustev
Telerik

[Gusev]

Hello!
I try this method earlier, but ".Value()" in wrapper Combobox doesn't work for me :(
If I use .Value(), then nothing changes.

[Georgi Krustev]

Hello Gusev,

 
If declaratively value setting does not work, then probably widget's value is set subsequently. In that case I will need more information about your current implementation in order to advice you further.

Regards,
Georgi Krustev
Telerik

[Gusev]

my EditorTemplate with name "PlanLumberList"

@model int

@(Html.Kendo().ComboBoxFor(x => x)
    .Value(Model == 0 ? string.Empty : Model.ToString())
    .DataTextField("Description")
    .DataValueField("Id")
    .Placeholder("Select")
    .HtmlAttributes(new { style = "width:225px", id = Guid.NewGuid().ToString() })
    .DataSource(databinding => databinding
        .Read(read => read
        .Action("SelectComboboxItems", "Lumber")))
)

my field in class

[Required]
[UIHint("PlanLumberList")]
[Display(Name = "IdLumberDisplay", ResourceType = typeof(LocalizationLumber))]
public virtual int IdLumber { get; set; }

my grid bound column

columns.Bound(o => o.IdLumber).ClientTemplate("#= LumberName #").Width(160);

[Georgi Krustev]

Hello Gusev,

 
In that case, you can wire the edit event of the grid. Thus you can get the combobox widget and clear the 
default value:

function edit(e) {
     var combobox = e.container.find("#PlanLumberList").data("kendoComboBox");
     if ( combobox && combobox.value() === "0" ) {
          combobox.value("");
     }
}

Check this link for the other arguments passed to the edit event handler.

Regards,
Georgi Krustev
Telerik

[Gusev]

Hello Georgi Krustev!
Thanks for help. 

[Osvaldo]

 

Sorry but Telerik seems to be missing the basic concept of not creating additional coding efforts and possible bugs to achieve functionality that the standard combo box in any environment implements fluently. I've never been impressed with a single app that used Telerik controls. In almost every situation, it created more work and problems than it hoped to fix.

 

[Petar]

Hi Osvaldo,

Can you be more exact with your feedback about the ComboBox component? What functionality would you like to have when using it? What additional work and issues you have had when using the component? 

This post is already seven years old. I don't know if your comment is related to the current thread but if you haven't worked with our latest product version, I would recommend trying it. Check the Combobox functionalities and let me know what is missing in the current implementation. 

Regards,

Petar
Progress Telerik