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130
Extending the UltraWebGrid Class
posted

Greetings Infragisticians, 

I've got a ton of web grids that i would like to summarily modify to display with the same paging behavior... i've got it paging every 25 records, however, if there are more than 5 pages (125 records) I would like to programmatically change from a Prev/Next paging StyleMode to a ComboBox, as some of these UltraWebGrids can easily consist of more than 50 pages of data, I figure the behavior would be like this:

                    If uwg_X.Rows.Count > 125 Then
                        uwg_X.DisplayLayout.Pager.StyleMode = PagerStyleMode.ComboBox
                    Else
                        uwg_X.DisplayLayout.Pager.StyleMode = PagerStyleMode.PrevNext
                    End If

However, i would rather not create a "Sub uwg_X_InitializeLayout()" for each of these grids, as there are so many of them...

I thought the easiest way to do this would be to extend the UltraWebGrid class as a custom class and add this code to the Sub New() constructor method, so all of these grids are instantiated with this logic built-in, but I can't find any programmatic examples of this.

I tried creating a new class like this:

Imports Microsoft.VisualBasic
Imports Infragistics.WebUI.UltraWebGrid
Imports Infragistics.WebUI.Design
Imports Infragistics.WebUI.Shared
Imports Infragistics.WebUI.CalcEngine
Imports Infragistics.WebUI.WebControls
Imports Infragistics.WebUI.Util.Serialization



Namespace CustomClasses

    Public Class CustomWebGrid
        Inherits Infragistics.WebUI.UltraWebGrid.UltraWebGrid
        Implements IUltraCalcParticipant, IGetClientSideEvents, IProvideDesignTimeHtml, IProvideAppStyling, & _ 
        IProvideDefaultStyles, IProvideStyleSheet, ISmartCallbackRender, IUltraLicensedComponent, & _ 
        ICanEditNavBar, IPlugInConsumer, IResolveStyles, IXPathDataNavigable, ISupportPresetSerialization, & _ 
        IProvideImageDirectoryResolution

        Public Sub New()
            If Me.Rows.Count > 125 Then
                Me.DisplayLayout.Pager.StyleMode = Infragistics.WebUI.UltraWebGrid.PagerStyleMode.ComboBox
            Else
                Me.DisplayLayout.Pager.StyleMode = Infragistics.WebUI.UltraWebGrid.PagerStyleMode.PrevNext
            End If
        End Sub

    End Class

End Namespace

After this, I put this reference at the top of the ASCX on which I would like to use the new control:
<%@ Register Assembly="CustomWebGrid" Namespace="GESlsOrd" TagPrefix="cust" %>

And then I started changing the tags on an existing UltraWebGrid on the ASCX from <igtbl:UltraWebGrid> ...
to <cust:CustomWebGrid> ...
<Bands>
<cust:UltraGridBand ...>
etc.

but the red-underlines seem to be a clear indication that this is not how it is done...

Can anyone offer suggestions on the correct way to do this?

Thanks much, in advance!

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  • 3147
    posted

    It doesn't recognize <cust:UltraGridBand...> because the tag prefix "cust" is registered for namespace GESlsOrd in CustomWebGrid assembly. You should be using "igtbl" prefix for UltraGridBand:

    <cust:CustomWebGrid> ...
        <Bands>
            <igtbl:UltraGridBand ...>
     

    Regards,
    Nick

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