This is a very newbie question...I'm trying to create a grid populated with search results. I want the user to be able to use the select button in the command column, have it read the data in that row, and perform a function. I've seen every tutorial that has to do with select, but none of them use the button - they all use checkboxes or custom radio buttons.

Calls this VB proc:

When the page runs, I get an error: dxgdSearch_CustomCallback is undefined.

Please tell me what I'm doing wrong! Thanks!

Shelley

Hi Shelley,

Yes you can create a select linkbutton and then handle this on the serverside. Try this:

First "Enable Selection" from the Smart Tag menu. Then bring up the Columns list. Here you can set the properties for the Command Column. Set the ShowSelectCheckBox to false. Then set the SelectButton->Visible to true. You can also set the text, image, etc. for this button. It'll display a link button with the text you specify, if none then it'll say 'Select'. You can the ButtonType property to display a LinkButton, regular button or image.

        <Columns>
            <dxwgv:GridViewCommandColumn VisibleIndex="0">
                <SelectButton Text="Select Row" Visible="True">
                </SelectButton>
            </dxwgv:GridViewCommandColumn>
 

On the serverside you can handle the OnSelectionChanged event and use the GetRowValues for your function. Please take a look at the serverside methods on this demo that reference GetRowValues:

Enable one row selection in the grid with Radiobuttons

Hi,

Could you please supply the vb code for the demo identified above (one row selection in the grid with radio buttons)

Many thanks

Roy

Hello Roy,

Here is the VB codebehind:

Partial Class Grid_Selection_OnRowSelection_OneRowSelectionVB

    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

        ClearSelectionOnOtherPages()

    End Sub

    Private Sub ClearSelectionOnOtherPages()

        If grid.Selection.Count <= 1 Then

            Return

        End If

        Dim curPageSelection As Integer = GetSelectedRowOnTheCurrentPage()

        grid.Selection.UnselectAll()

        grid.Selection.SelectRow(curPageSelection)

    End Sub

    Private Function GetSelectedRowOnTheCurrentPage() As Integer

        Dim startIndexOnPage As Integer = grid.PageIndex * grid.SettingsPager.PageSize

        For i As Integer = 0 To grid.VisibleRowCount - 1

            If grid.Selection.IsRowSelected(startIndexOnPage + i) Then

                Return startIndexOnPage + i

            End If

        Next

        Return -1

    End Function

    Public Overridable Function GetFieldChecked(ByVal item As Object) As String

        If Session("FocusedRow") IsNot Nothing Then

            Dim row As DevExpress.Web.Data.WebDescriptorRowBase = TryCast(item, DevExpress.Web.Data.WebDescriptorRowBase)

            Dim o As Object = grid.GetRowValues(row.VisibleIndex, grid.KeyFieldName)

            Return IIf(Session("FocusedRow").ToString().Trim() = o.ToString().Trim(), "CHECKED", "")

        Else

            Return ""

        End If

    End Function

    Protected Sub grid_CustomCallback(ByVal sender As Object, ByVal e As DevExpress.Web.ASPxGridView.ASPxGridViewCustomCallbackEventArgs)

        Session("FocusedRow") = grid.GetRowValues(Convert.ToInt32(e.Parameters), New String() {grid.KeyFieldName})

    End Sub

End Class

Thanks.

Hi,

Although I can change selection by choosing radio button on different row, I get an  "Errors on Page" message appear every time I change row.

I think it must be my column set up in my grid.

Is it possible to to send me the aspx page that contains the grid in the demo.  (so I can see the settings for the Isselected column and edit template valuesfor the radio button)

Many thanks,

Roy

Hello Roy,

The ASPX page should be the same but I've created zip that contains both for you. You'll need a copy of the nwind.mdb in your AppData folder. You can find a copy in our Program Files/Developer Express ... folder.

FocusRowVB.zip

Thanks.