WebDataTree and load-on-demand | Infragistics Forums

365

WebDataTree and load-on-demand

Vladimir posted over 15 years ago

WebDataTree with enabled load-on-demand does not work with WebhierarchyDataSource with Self-Related Data Relation.

Is it bug or feature?

Vladimir

365

Vladimir posted over 15 years ago in reply to [Infragistics] David Young

Yes

That example is working.

I was trying to use codebehand and it does not work

Here is my aspx

-----START ASPX -------

<ig:WebDataTree ID="WebDataTree1" runat="server" ></ig:WebDataTree>

<ig:WebHierarchicalDataSource ID="WebHierarchicalDataSource1" runat="server">

</ig:WebHierarchicalDataSource>

<asp:AccessDataSource ID="AccessDataSource1" runat="server">

</asp:AccessDataSource
>

----- END ASPX -----------

If Not Me.Page.IsPostBack
Then

Me.AccessDataSource1.DataFile = "~/App_Data/TreeData.mdb"

Me.AccessDataSource1.SelectCommand = "SELECT [Code], [TextValue], [ParentCode] FROM [Data]"

Dim view As DataView
view =

New DataView
view.ID =

"DefailtView"

view.DataSourceID =

Me.AccessDataSource1.ID
view.DataMember =

"DefailtView"

Me.WebHierarchicalDataSource1.DataViews.Add(view)

Dim relation As DataRelation
relation =

New DataRelation
relation.ChildColumns =

New String() {"ParentCode"}
relation.ChildDataViewID = view.ID

relation.ParentColumns =

New String() {"Code"}
relation.ParentDataViewID = view.ID

Me.WebHierarchicalDataSource1.DataRelations.Add(relation)

Me.WebDataTree1.InitialDataBindDepth = 0

Me.WebDataTree1.DataLoadingMessage = "Loading from table ..."

Me.WebDataTree1.DataSourceID = Me.WebHierarchicalDataSource1.ID

Dim binding As DataTreeNodeBinding
binding =

New DataTreeNodeBinding
binding.DataMember = view.ID

binding.TextField =

"TextValue"

binding.ValueField =

"Code"

Me.WebDataTree1.DataBindings.Add(binding)

End If

End Sub

--- START CODE BEHIND ---

--- END CODE BEHIND --
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33839

[Infragistics] David Young posted over 15 years ago

Vladimir,

I am assuming you are talking about the Infragistics WebHierarchicalDataSource.

This feature should work fine. Did you set up a DataBinding on the tree for the datasource. The following code for me brings the first level in initially and fetches subsequent ones. What exactly was the problem you experienced? No data? All data at the start?

            <ig:WebDataTree ID="WebDataTree1" runat="server" Height="300px" Width="200px"
                DataSourceID="WebHierarchicalDataSource1" InitialDataBindDepth="0">
                <DataBindings>
                    <ig:DataTreeNodeBinding DataMember="AccessDataSource1_DefaultView"
                        TextField="TextValue" ValueField="Code" />
                </DataBindings>
            </ig:WebDataTree>
        <ig:WebHierarchicalDataSource ID="WebHierarchicalDataSource1" runat="server">
            <DataRelations>
                <ig:DataRelation ChildColumns="ParentCode"
                    ChildDataViewID="AccessDataSource1_DefaultView" ParentColumns="Code"
                    ParentDataViewID="AccessDataSource1_DefaultView" />
            </DataRelations>
            <DataViews>
                <ig:Dataview id="AccessDataSource1_DefaultView"
                    datamember="DefaultView" datasourceid="AccessDataSource1">
                </ig:Dataview>
            </DataViews>
        </ig:WebHierarchicalDataSource>
        <asp:AccessDataSource ID="AccessDataSource1" runat="server"
            DataFile="~/App_Data/TreeData.mdb"
            SelectCommand="SELECT [Code], [TextValue], [ParentCode] FROM [Data]">
        </asp:AccessDataSource>

regards,

David Young
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