GridView row dissappearing on SelectedIndexChanged

[binarymax]

Hi, I have a crazy problem where when I select any row(call it rowA) in a gridview, and then when I select any different row (call it rowB), rowA dissappears. If I then select another row (rowC), rowB dissappears, and so on. These rows are not in any specific order and it happens with any case. I really want all the rows to stay there! As a temporary hack I am re-binding on every select, and I am pretty sure this causes a performance issue so I really don't want to keep it this way. Is there any way for me to select different rows while by default keeping them all visible? Many thanks in advance! Max.

[Christian Graus]

What do you mean by 'select' ? What is your code that runs when you 'select' a row ?

Christian Graus Driven to the arms of OSX by Vista. "I am new to programming world. I have been learning c# for about past four weeks. I am quite acquainted with the fundamentals of c#. Now I have to work on a project which converts given flat files to XML using the XML serialization method" - SK64 ( but the forums have stuff like this posted every day )

[binarymax]

Right, it might help if I show the code!

<asp:GridView ID="gvIncidents" runat="server" AllowSorting="true" AutoGenerateColumns="false" onrowcommand="gvIncidents\_RowCommand">
<HeaderStyle ForeColor="#606060"></HeaderStyle>
<Columns>
    <asp:BoundField DataField="FormID" HeaderText="" />
    <asp:BoundField DataField="FormType" HeaderText="Type" />
    <asp:BoundField DataField="FormDateTime" HeaderText="Date/Time" />
    <asp:BoundField DataField="Description" HeaderText="Description" />
    <asp:BoundField DataField="DateCreated" HeaderText="Date Created" />
    <asp:ButtonField CommandName="Import" Text="Import" ButtonType="Button" />
    <asp:ButtonField CommandName="Deny" Text="Delete" ButtonType="Button" />
</Columns>
</asp:GridView>

In my page load:

        ...
        Me.gvIncidents.DataSource = dtIncidents
        Me.gvIncidents.DataBind()
        Me.gvIncidents.Visible = True
        Me.gvIncidents.Columns(0).Visible = False
        ...

Handlers:

Protected Sub gvIncidents\_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvIncidents.RowDataBound

    Try

        With e.Row
            If .RowType = DataControlRowType.DataRow Then

                .CssClass = "gridrow"

                'Change the cursor on mouseover
                .Cells(2).Attributes.Add("onMouseOver", "this.style.cursor='hand';")
                .Cells(2).Attributes.Add("onclick", ClientScript.GetPostBackEventReference(gvIncidents, "Select$" + .RowIndex.ToString()))

            Else 'Header
                .CssClass = "gridtitle"

            End If
        End With

    Catch ex As Exception
        Throw ex
    End Try

End Sub

Protected Sub gvIncidents\_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles gvIncidents.SelectedIndexChanged
    Dim oGrid As GridView
    Dim oRow As GridViewRow

    Try
        oGrid = CType(sender, GridView)
        oRow = oGrid.SelectedRow

        PopulateIncidents() 'temporary hack to stop the rows from dissappearing

        ShowIncidentDetails(CType(oRow.Cells(0).Text, Integer))

    Catch ex As Exception

    End Try
End Sub

[Christian Graus]

binarymax wrote:

Me.gvIncidents.Columns(0).Visible = False

And is it always the top line that disappears ? What if you remove this line ? Do you databind on every postback ? I remember you saying you did, you're saying this solves the issue, but when you have the issue, this code is entirely in an !IsPostback block ? PopulateIncidents reloads the data ? What does ShowIncidentDetails do ? Have you tried commenting out sections of this code to work out which part is causing the issue ?

Christian Graus Driven to the arms of OSX by Vista. "I am new to programming world. I have been learning c# for about past four weeks. I am quite acquainted with the fundamentals of c#. Now I have to work on a project which converts given flat files to XML using the XML serialization method" - SK64 ( but the forums have stuff like this posted every day )

[binarymax]

Good questions, the row that is dissappearing is the last row you selected. So if I select the 5th row, and then the 7th row, row 5 dissappears. Right that page load is entirely in an !IsPostback block and it initially binds the data. PopulateIncidents is a function that re-binds the data. ShowIncidentDetails shows a panel with details about the row you selected, if I remove that the problem persists. Also I removed Me.gvIncidents.Columns(0).Visible = False from page load and still the same problem. The part that is causing the problem is having the SelectedIndexChanged event. I can strip out all the code from SelectedIndexChanged and the problem stays the same. If I remove the event entirely then the problem goes away, but I need the event in order to select the row, so I really can't remove it. Thanks.

modified on Tuesday, May 5, 2009 5:57 AM

[Herman T Instance]

Why you have the line <asp:BoundField DataField="FormID" HeaderText="" /> in your ASP if your code behind removes the column. Or skip it Or you might want to add DataKeyNames to this line: <asp:GridView ID="gvIncidents" runat="server" AllowSorting="true" AutoGenerateColumns="false" onrowcommand="gvIncidents_RowCommand"> If you debug the SelectedIndexChanged event what is the value for oGrid.SelectedIndex? And is the oGrid.SelectedRow the row you selected?

In Word you can only store 2 bytes. That is why I use Writer.

[binarymax]

Thanks for the reply, The FormID is bound because that is the PK that I don't want the user to see, but when the row is selected then I use FormID to lookup data so I can populate a panel with record details. Even when it is visible I still have the same problems. oGrid.SelectedIndex and SelectedRow are behaving as expected.

[Herman T Instance]

that is why you can use the DataKeyNames to store your PK in. So not visiblle but accessible and no columns to hide. If you set the selectedIndex value, the property SelectedValue will contain the PK value. ShowIncidentDetails(CType(oRow.Cells(0).Text, Integer)) isn't cells[0] now formtype in stead of formID?

In Word you can only store 2 bytes. That is why I use Writer.

[binarymax]

I can use DataKeyNames which is nice to know but unfortunately it doesnt solve the problem :( Also, even if I set visible=false on the first column the data is still bound as index 0 so cells[0] returns the formid as expected.