Data binding dynamic GridTemplateColumn

[Pierre]

HI, I have a Prometheus RadGrid that I build dynamically when a user click on a button. With the Prometheus Ajax, I clear all the colunm definition (depending on the button clicked the colunm change) and recreate it. On one situation, I have a template column that display a icon or a blank icon dépending on boolean value. All work good, the first time the grid are created the column header template and the item template work good. But if I click on one item in the grid, the rad ajax update some textbox, but I lost the header and item template.

Any suggestion?

The CreeGridAct are called after a ajaxified postback button click


Create the grid and template dynamically:

 Private Sub CreeGridAct()
        Dim column1 As GridBoundColumn
        Dim ColumnTmpl As GridTemplateColumn

        EffaceChamps()

        RadGridUsager.Skin = "WebBlue"
        RadGridUsager.Width = Unit.Pixel(450)
        RadGridUsager.PageSize = 15
        RadGridUsager.AllowPaging = True
        RadGridUsager.AllowSorting = True
        RadGridUsager.GridLines = GridLines.Horizontal
        RadGridUsager.AllowMultiRowSelection = True
        RadGridUsager.PagerStyle.Mode = GridPagerMode.NextPrevNumericAndAdvanced
        RadGridUsager.AutoGenerateColumns = False
        RadGridUsager.GroupingEnabled = False
        RadGridUsager.ShowGroupPanel = False
        RadGridUsager.ShowFooter = True

        RadGridUsager.ClientSettings.AllowDragToGroup = False
        RadGridUsager.ClientSettings.AllowColumnsReorder = True
        RadGridUsager.ClientSettings.EnablePostBackOnRowClick = True
        RadGridUsager.ClientSettings.ApplyStylesOnClient = True
        RadGridUsager.ClientSettings.Selecting.AllowRowSelect = True

        RadGridUsager.MasterTableView.PageSize = 15
        RadGridUsager.MasterTableView.Width = Unit.Percentage(100)

        RadGridUsager.MasterTableView.Columns.Clear()

        'Creation des colones pour cet affichage
        column1 = New GridBoundColumn
        RadGridUsager.MasterTableView.Columns.Add(column1)
        column1.DataField = "Usager"
        column1.HeaderText = "Usager"
        column1.Visible = False

        column1 = New GridBoundColumn
        RadGridUsager.MasterTableView.Columns.Add(column1)
        column1.DataField = "Nom"
        column1.HeaderText = "Nom"

        column1 = New GridBoundColumn
        RadGridUsager.MasterTableView.Columns.Add(column1)
        column1.DataField = "Compagnie"
        column1.HeaderText = "Compagnie"

        column1 = New GridBoundColumn
        RadGridUsager.MasterTableView.Columns.Add(column1)
        column1.DataField = "Ville"
        column1.HeaderText = "Ville"

        column1 = New GridBoundColumn
        RadGridUsager.MasterTableView.Columns.Add(column1)
        column1.DataField = "Telephone"
        column1.HeaderText = "Téléphone"

        ColumnTmpl = New GridTemplateColumn
        RadGridUsager.MasterTableView.Columns.Add(ColumnTmpl)
        ColumnTmpl.UniqueName = "Suspendu"
        ColumnTmpl.Groupable = False
        ColumnTmpl.SortExpression = "Suspendu"
        ColumnTmpl.HeaderStyle.Width = 20
        ColumnTmpl.HeaderTemplate = New SusHeaderTemplate
        ColumnTmpl.ItemTemplate = New SusItemTemplate


        RadGridUsager.Rebind()

    End Sub

    Private Class SusHeaderTemplate
        Implements ITemplate

        Public Sub New()
            MyBase.New()
        End Sub

        Protected imgSus As Image

        Public Sub InstantiateIn(ByVal container As System.Web.UI.Control) Implements ITemplate.InstantiateIn
            imgSus = New Image
            imgSus.ImageUrl = "images/Misc/suspendu.gif"
            container.Controls.Add(imgSus)
        End Sub
    End Class

    Private Class SusItemTemplate
        Implements ITemplate

        Public Sub New()
            MyBase.New()
        End Sub

        Protected imgSus As Image

        Public Sub InstantiateIn(ByVal container As System.Web.UI.Control) Implements ITemplate.InstantiateIn
            imgSus = New Image
            imgSus.ImageUrl = "images/Misc/Blank.gif"
            container.Controls.Add(imgSus)

            AddHandler imgSus.DataBinding, AddressOf Me.imgSus_DataBinding
        End Sub

        Private Sub imgSus_DataBinding(ByVal sender As Object, ByVal e As EventArgs)
            Dim imgSus As Image = CType(sender, Image)
            Dim container As GridDataItem = CType(imgSus.NamingContainer, GridDataItem)

            If Convert.ToBoolean(DataBinder.Eval(container.DataItem, "Suspendu")) = True Then
                imgSus.ImageUrl = "images/Misc/suspendu.gif"
            Else
                imgSus.ImageUrl = "images/Misc/blank.gif"
            End If
        End Sub
    End Class

[Rosen]

Hello Pierre,

In order templated columns (which are added programmatically) to persist their state properly you should create the entire RadGrid control in the code-behind inside the page's OnInit handler. Please refer to this article from the online documentation for more information on this subject.

Best regards,
Rosen
the Telerik team

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