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Custom TreeListColumn

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Stig
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Stig asked on 01 Dec 2015, 05:45 PM

Hi

 Im hoping you are able to help me, im quite new to telerik components and so far they work like a treat.. 

But now i ran into an issue, were i want to create a new TreeListColumn  - i found an example in silverlight (i think, it mentioned xaml files), i need a quick simple example of how to do this...

 I know i can create it is a TreeListTemplateColumn, but as this is going to be used mutiple times, i think it would be better to create a custom column. But what ever i have tried (user control, inherits from Telerik.Web.UI.TreeListEditableColumn amongst other) have failed.

Do you have a smaple floating somewhere? or are you able to  quickly markup a simple sample using a textbox or something?

 

Thanks

/Stig

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Eyup
Telerik team
answered on 03 Dec 2015, 09:50 AM
Hello Stig,

Are you looking for something similar to the approach demonstrated in the following sample for RadGrid?
http://www.telerik.com/forums/filter-a-template-column-with-values-from-multiple-datafields#lhpEuz9KsEWqdUEkRfgvPQ

Please keep in mind that creating custom controls is beyond our support scope even if they inherit directly form Telerik controls. Instead, I suggest that you create your entire RadTreeList in the code-behind during the Page_Init event handler and built a generic generation for programmatic creation of your template columns:
http://docs.telerik.com/devtools/aspnet-ajax/controls/treelist/defining-structure/programmatic-definition#creating-template-columns-dynamically

I hope this will prove helpful.

Regards,
Eyup
Telerik
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Stig
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answered on 03 Dec 2015, 10:00 AM

Hi Eyup

that example is exactly what i need...

 ApostropheInsensitiveColumn : GridBoundColumn

but what class do i need to inherit from when we are talking treelist?

 

And yes, i had a feeling that my question was outside support scope - but i have found other samples you have created so i just hoped that you had something that perhaps was not published yet.

 

 /Stig

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Stig
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answered on 04 Dec 2015, 12:03 PM

I allmost got it to work , and i hope you are able to help even thou this might be out of scope.

With the help of the two links 

http://docs.telerik.com/devtools/aspnet-ajax/controls/treelist/defining-structure/programmatic-definition#creating-template-columns-dynamically

and

https://msdn.microsoft.com/en-us/library/aa479316.aspx

 

but i have a small problem.... the value isnt "saved" - what have i forgotten:

 

Namespace CustomColumns

    Public Class ValueSetColumn
        Inherits TreeListTemplateColumn
        Private _valueSet As String
        Private ListItems As OrderedDictionary

        Public Property ValueSet As String
            Get
                Return _valueSet
            End Get
            Set(value As String)
                Dim strs As String()
                _valueSet = value
                For Each Str As String In value.Split(",")
                    strs = Str.Split("=")
                    ListItems.Add(strs(0), strs(1))
                Next
            End Set
        End Property

        Public Sub New()
            Me.ListItems = New OrderedDictionary()
            Me.ItemTemplate = New ItemValueSetTemplate(Me)
            Me.EditItemTemplate = New EditValueSetTemplate(Me)
        End Sub

#Region "EditValueSetTemplate"
        Private Class EditValueSetTemplate
            Implements IBindableTemplate
            Private owner As ValueSetColumn = Nothing
            Private ddl As RadDropDownList = Nothing

            Public Sub New(owner As ValueSetColumn)
                Me.owner = owner
            End Sub

            Public Function ExtractValues(container As Control) As IOrderedDictionary Implements IBindableTemplate.ExtractValues
                Dim values As New OrderedDictionary()
                values(owner.DataField) = ddl.SelectedItem.Value
                Return values
            End Function

            Public Sub InstantiateIn(container As Control) Implements ITemplate.InstantiateIn
                ddl = New RadDropDownList()
                ddl.Enabled = True
                ddl.MergeStyle(owner.ItemStyle)
                AddHandler ddl.DataBinding, AddressOf DataBinding
                container.Controls.Add(ddl)
            End Sub

            Private Sub DataBinding(ByVal sender As Object, ByVal e As EventArgs)
                Dim item As DropDownListItem
                Dim DDL As RadDropDownList = DirectCast(sender, RadDropDownList)
                Dim container As TreeListEditableItem = DirectCast(DDL.NamingContainer, TreeListEditableItem)
                Dim selectedvalue As String = DirectCast(container.DataItem, DataRowView)(owner.DataField).ToString()
                DDL.Items.Clear()
                For Each ditem In owner.ListItems
                    item = New DropDownListItem(ditem.Key, ditem.Value)
                    item.Selected = (item.Value = selectedvalue)
                    DDL.Items.Add(item)
                Next
            End Sub
        End Class
#End Region

#Region "ItemValueSetTemplate"
        Private Class ItemValueSetTemplate
            Implements IBindableTemplate
            Private owner As ValueSetColumn = Nothing
            Private ddl As RadDropDownList = Nothing

            Public Sub New(owner As ValueSetColumn)
                Me.owner = owner
            End Sub

            Public Function ExtractValues(container As Control) As IOrderedDictionary Implements IBindableTemplate.ExtractValues
                Dim values As New OrderedDictionary()
                values(owner.DataField) = ddl.SelectedItem.Value
                Return values
            End Function

            Public Sub InstantiateIn(container As Control) Implements ITemplate.InstantiateIn
                ddl = New RadDropDownList()
                AddHandler ddl.DataBinding, AddressOf DataBinding
                ddl.MergeStyle(owner.ItemStyle)
                ddl.Enabled = False
                container.Controls.Add(ddl)
            End Sub

            Private Sub DataBinding(ByVal sender As Object, ByVal e As EventArgs)
                Dim item As DropDownListItem
                Dim DDL As RadDropDownList = DirectCast(sender, RadDropDownList)
                Dim container As TreeListEditableItem = DirectCast(DDL.NamingContainer, TreeListEditableItem)
                Dim selectedvalue As String = DirectCast(container.DataItem, DataRowView)(owner.DataField).ToString()
                DDL.Items.Clear()
                For Each ditem In owner.ListItems
                    item = New DropDownListItem(ditem.Key, ditem.Value)
                    item.Selected = (item.Value = selectedvalue)
                    DDL.Items.Add(item)
                Next
            End Sub
        End Class
#End Region

    End Class

End Namespace

 

 

 

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Eyup
Telerik team
answered on 08 Dec 2015, 05:59 AM
Hi Stig,

I understand that you are putting efforts into this, but as I've already stated, this requirement is quite custom. Nevertheless, I value your hard work on this implementation so I will take a look to your project. For that purpose, please create a new web site sample to isolate the RadTreeList and the custom column and open a formal support ticket to send it to us.

Regards,
Eyup
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Stig
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answered on 09 Dec 2015, 01:29 PM

Thanks for the offer - in my attempt to isolate this into a simple website that i could upload i actually managed to get it working.

I will create the ticket anyway so you have it, and you can then choose to refine this into an example or something if you want.

 

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Eyup
Telerik team
answered on 14 Dec 2015, 08:36 AM
Hi Stig,

I've already checked the sample and replied in the mentioned ticket.
Please feel free to turn to us for questions about the functionality provided by Telerik controls.

Regards,
Eyup
Telerik
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Stig
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