Datalist with Edit template and custom paging

[1333]

Is it possible to have a Datalist with an Edit mode (<EditItemTemplate />) and custom paging?

I can get <EditItemTemplate> mode and custom paging to work seperately but not together. I can delete a row from the datalist, but once I go into edit mode the UpdateCommand fails. Is this possible because I am going around in circles with postback or not Postback?

[kenobewan]

What error do get? Please post some relevant code.

[1333]

I know the Protected Sub AllPendingImages_UpdateCommand works because when I remove the PAGING code the code fires and the DB gets updated.
When I re-add the paging code and enter edit mode on my page, I think that the id value gets changed to _Page (don't know why) and the update command doesn't fire because the value is not an integer. I have wrapped the code in a Try/Catch but that doesn't throw up any errors - so I'm stuck. Any ideas would be really appreciated, I'm on day 4 looking at it. Thinking about redoing it in a GridView but I prefer the flexibility with the html in a datalist. txs

my aspx page:

<asp:button id="cmdFirst" runat="server" text="&laquo; First " onclick="cmdFirst_Click" CssClass="button"></asp:button>
<asp:button id="cmdPrev" runat="server" text="&laquo; Back " onclick="cmdPrev_Click" CssClass="button"></asp:button>
<asp:button id="cmdNext" runat="server" text=" Next &raquo; " onclick="cmdNext_Click" CssClass="button"></asp:button>
<asp:button id="cmdLast" runat="server" text=" Last &raquo; " onclick="cmdLast_Click" CssClass="button"></asp:button>
 
<asp:DataList DataKeyField="id" ID="AllPendingImages" runat="server" RepeatColumns="1" RepeatDirection="Horizontal" EnableViewState="false">
<ItemTemplate>
...
</ItemTemplate>
<EditItemTemplate>
...
</EditItemTemplate>
</asp:DataList>

Code Behind:

    Protected WithEvents DDPending As System.Web.UI.WebControls.DropDownList
    Public Property CurrentPage() As Integer
        Get
            Dim o As Object = ViewState("_CurrentPage")
            If (o = Nothing) Then
                Return 0
            End If
            Return CType(o, Integer)
        End Get
        Set(ByVal value As Integer)
            ViewState("_CurrentPage") = value
        End Set
    End Property
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        ItemsGet()
    End Sub
 
    Protected Sub ItemsGet()
        Dim ConnStr As String = System.Configuration.ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString
        Dim mySqlConn As New SqlClient.SqlConnection(ConnStr)
        Dim objDA As New SqlDataAdapter("exec sp_GetPendingImages", ConnStr)
        Dim objDS As New DataSet()
        objDA.Fill(objDS)
        mySqlConn.Close()
 
        Dim objPds As PagedDataSource = New PagedDataSource
        objPds.DataSource = objDS.Tables(0).DefaultView
        objPds.AllowPaging = True
        objPds.PageSize = 3
 
        objPds.CurrentPageIndex = CurrentPage
 
        lblCount.Text = ("no of items per page:" + (objPds.Count).ToString + "<br /><br />")
        lblCurrentPageIndex.Text = ("page number:" + (objPds.CurrentPageIndex).ToString + "<br /><br />")
        lblPageCount.Text = ("number of pages:" + (objPds.PageCount).ToString + "<br /><br />")
        lblCurrentPage.Text = ("Page: " + ((CurrentPage + 1).ToString + (" of " + objPds.PageCount.ToString)))
 
        cmdPrev.Enabled = Not objPds.IsFirstPage
        cmdNext.Enabled = Not objPds.IsLastPage
        cmdFirst.Enabled = Not objPds.IsFirstPage
        cmdLast.Enabled = Not objPds.IsLastPage
 
        AllPendingImages.DataSource = objPds
      AllPendingImages.DataBind()
    End Sub
 
    Protected Sub cmdPrev_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        CurrentPage = (CurrentPage - 1)
        ItemsGet()
    End Sub
 
    Protected Sub cmdNext_Click(ByVal sender As Object, ByVal e As System.EventArgs)
         CurrentPage = (CurrentPage + 1)
        ItemsGet()
    End Sub
 
    Protected Sub cmdFirst_Click(ByVal sender As Object, ByVal e As System.EventArgs)
         CurrentPage = 0
        ItemsGet()
    End Sub
 
    Protected Sub cmdLast_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        CurrentPage = (CurrentPage + 2)
        ItemsGet()
    End Sub
 
    Protected Sub AllPendingImages_EditCommand(ByVal source As Object, ByVal e As DataListCommandEventArgs) Handles AllPendingImages.EditCommand
        AllPendingImages.EditItemIndex = e.Item.ItemIndex
        ItemsGet()
    End Sub
 
    Protected Sub AllPendingImages_CancelCommand(ByVal source As Object, ByVal e As DataListCommandEventArgs) Handles AllPendingImages.CancelCommand
        AllPendingImages.EditItemIndex = -1
         ItemsGet()
    End Sub
 
    Protected Sub AllPendingImages_DeleteCommand(ByVal source As Object, ByVal e As DataListCommandEventArgs) Handles AllPendingImages.DeleteCommand
If Page.IsPostBack Then
        Dim id As Integer = Convert.ToInt32(AllPendingImages.DataKeys(e.Item.ItemIndex))
         Dim ConnStr As String = System.Configuration.ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString
        Dim mySqlConn As New SqlClient.SqlConnection(ConnStr)
        mySqlConn.Open()
        Dim SQL As String = "sp_DeleteImageRow"
        Dim mySqlCmd As New SqlClient.SqlCommand(SQL, mySqlConn)
        mySqlCmd.CommandType = CommandType.StoredProcedure
        Dim mySqlParamImageID As New SqlClient.SqlParameter("@ImageID", SqlDbType.Int)
        mySqlCmd.Parameters.Add(mySqlParamImageID).Value = id
        mySqlCmd.ExecuteNonQuery()
        mySqlConn.Close()
        AllPendingImages.EditItemIndex = -1
         ItemsGet()
End if
    End Sub
 
    Protected Sub AllPendingImages_UpdateCommand(ByVal source As Object, ByVal e As DataListCommandEventArgs) Handles AllPendingImages.UpdateCommand  
     'If Page.IsPostBack Then
    Dim id As Integer = Convert.ToInt32(AllPendingImages.DataKeys(e.Item.ItemIndex))
 
    Dim DDLPending As DropDownList = CType(e.Item.FindControl("DDLPending"), DropDownList)
        Dim Pending As String
        Pending = DDLPending.SelectedValue
 
        Select Case DDLPending.SelectedIndex 'Expression
            Case 0 
                Pending = 1  'Decline
            Case 1
                Pending = 2  'Accept
        End Select
 
        Dim PendingValue As String = Nothing
        PendingValue = Pending
 
 
        Dim ConnStr As String = System.Configuration.ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString
        Dim mySqlConn As New SqlClient.SqlConnection(ConnStr)
        mySqlConn.Open()
        Dim SQL As String = "sp_UpdatePending"
        Dim mySqlCmd As New SqlClient.SqlCommand(SQL, mySqlConn)
        mySqlCmd.CommandType = CommandType.StoredProcedure
 
        Dim mySqlParamPending As New SqlClient.SqlParameter("@Pending", SqlDbType.Int)
        Dim mySqlParamImageID As New SqlClient.SqlParameter("@ImageID", SqlDbType.Int)
 
        mySqlCmd.Parameters.Add(mySqlParamPending).Value = PendingValue
        mySqlCmd.Parameters.Add(mySqlParamImageID).Value = id
        mySqlCmd.ExecuteNonQuery()
        mySqlConn.Close()
 
        AllPendingImages.EditItemIndex = -1
         ItemsGet()
'End if
    End Sub
 
 
 

[kenobewan]

I recall a similar problem I had a year ago. I believe that I copied the paging code into the update command and it worked. So I believe I settled on having a separate sub for paging and referencing that as necessary.

Hope that this helps.

[archu007]

Hi
Thank u ..
I was searching for datalist paging,i tried ur code its working and solved my problem .
I have tried only paging not the "allpendingimages" code
if u get the solution plz forward to me also
my id is

[e-mail]

Thank u
Archu

I know the Protected Sub AllPendingImages_UpdateCommand works because when I remove the PAGING code the code fires and the DB gets updated.
When I re-add the paging code and enter edit mode on my page, I think that the id value gets changed to _Page (don't know why) and the update command doesn't fire because the value is not an integer. I have wrapped the code in a Try/Catch but that doesn't throw up any errors - so I'm stuck. Any ideas would be really appreciated, I'm on day 4 looking at it. Thinking about redoing it in a GridView but I prefer the flexibility with the html in a datalist. txs

my aspx page:

<asp:button id="cmdFirst" runat="server" text="&laquo; First " onclick="cmdFirst_Click" CssClass="button"></asp:button>
<asp:button id="cmdPrev" runat="server" text="&laquo; Back " onclick="cmdPrev_Click" CssClass="button"></asp:button>
<asp:button id="cmdNext" runat="server" text=" Next &raquo; " onclick="cmdNext_Click" CssClass="button"></asp:button>
<asp:button id="cmdLast" runat="server" text=" Last &raquo; " onclick="cmdLast_Click" CssClass="button"></asp:button>
 
<asp:DataList DataKeyField="id" ID="AllPendingImages" runat="server" RepeatColumns="1" RepeatDirection="Horizontal" EnableViewState="false">
<ItemTemplate>
...
</ItemTemplate>
<EditItemTemplate>
...
</EditItemTemplate>
</asp:DataList>

Code Behind:

    Protected WithEvents DDPending As System.Web.UI.WebControls.DropDownList
    Public Property CurrentPage() As Integer
        Get
            Dim o As Object = ViewState("_CurrentPage")
            If (o = Nothing) Then
                Return 0
            End If
            Return CType(o, Integer)
        End Get
        Set(ByVal value As Integer)
            ViewState("_CurrentPage") = value
        End Set
    End Property
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        ItemsGet()
    End Sub
 
    Protected Sub ItemsGet()
        Dim ConnStr As String = System.Configuration.ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString
        Dim mySqlConn As New SqlClient.SqlConnection(ConnStr)
        Dim objDA As New SqlDataAdapter("exec sp_GetPendingImages", ConnStr)
        Dim objDS As New DataSet()
        objDA.Fill(objDS)
        mySqlConn.Close()
 
        Dim objPds As PagedDataSource = New PagedDataSource
        objPds.DataSource = objDS.Tables(0).DefaultView
        objPds.AllowPaging = True
        objPds.PageSize = 3
 
        objPds.CurrentPageIndex = CurrentPage
 
        lblCount.Text = ("no of items per page:" + (objPds.Count).ToString + "<br /><br />")
        lblCurrentPageIndex.Text = ("page number:" + (objPds.CurrentPageIndex).ToString + "<br /><br />")
        lblPageCount.Text = ("number of pages:" + (objPds.PageCount).ToString + "<br /><br />")
        lblCurrentPage.Text = ("Page: " + ((CurrentPage + 1).ToString + (" of " + objPds.PageCount.ToString)))
 
        cmdPrev.Enabled = Not objPds.IsFirstPage
        cmdNext.Enabled = Not objPds.IsLastPage
        cmdFirst.Enabled = Not objPds.IsFirstPage
        cmdLast.Enabled = Not objPds.IsLastPage
 
        AllPendingImages.DataSource = objPds
      AllPendingImages.DataBind()
    End Sub
 
    Protected Sub cmdPrev_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        CurrentPage = (CurrentPage - 1)
        ItemsGet()
    End Sub
 
    Protected Sub cmdNext_Click(ByVal sender As Object, ByVal e As System.EventArgs)
         CurrentPage = (CurrentPage + 1)
        ItemsGet()
    End Sub
 
    Protected Sub cmdFirst_Click(ByVal sender As Object, ByVal e As System.EventArgs)
         CurrentPage = 0
        ItemsGet()
    End Sub
 
    Protected Sub cmdLast_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        CurrentPage = (CurrentPage + 2)
        ItemsGet()
    End Sub
 
    Protected Sub AllPendingImages_EditCommand(ByVal source As Object, ByVal e As DataListCommandEventArgs) Handles AllPendingImages.EditCommand
        AllPendingImages.EditItemIndex = e.Item.ItemIndex
        ItemsGet()
    End Sub
 
    Protected Sub AllPendingImages_CancelCommand(ByVal source As Object, ByVal e As DataListCommandEventArgs) Handles AllPendingImages.CancelCommand
        AllPendingImages.EditItemIndex = -1
         ItemsGet()
    End Sub
 
    Protected Sub AllPendingImages_DeleteCommand(ByVal source As Object, ByVal e As DataListCommandEventArgs) Handles AllPendingImages.DeleteCommand
If Page.IsPostBack Then
        Dim id As Integer = Convert.ToInt32(AllPendingImages.DataKeys(e.Item.ItemIndex))
         Dim ConnStr As String = System.Configuration.ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString
        Dim mySqlConn As New SqlClient.SqlConnection(ConnStr)
        mySqlConn.Open()
        Dim SQL As String = "sp_DeleteImageRow"
        Dim mySqlCmd As New SqlClient.SqlCommand(SQL, mySqlConn)
        mySqlCmd.CommandType = CommandType.StoredProcedure
        Dim mySqlParamImageID As New SqlClient.SqlParameter("@ImageID", SqlDbType.Int)
        mySqlCmd.Parameters.Add(mySqlParamImageID).Value = id
        mySqlCmd.ExecuteNonQuery()
        mySqlConn.Close()
        AllPendingImages.EditItemIndex = -1
         ItemsGet()
End if
    End Sub
 
    Protected Sub AllPendingImages_UpdateCommand(ByVal source As Object, ByVal e As DataListCommandEventArgs) Handles AllPendingImages.UpdateCommand  
     'If Page.IsPostBack Then
    Dim id As Integer = Convert.ToInt32(AllPendingImages.DataKeys(e.Item.ItemIndex))
 
    Dim DDLPending As DropDownList = CType(e.Item.FindControl("DDLPending"), DropDownList)
        Dim Pending As String
        Pending = DDLPending.SelectedValue
 
        Select Case DDLPending.SelectedIndex 'Expression
            Case 0 
                Pending = 1  'Decline
            Case 1
                Pending = 2  'Accept
        End Select
 
        Dim PendingValue As String = Nothing
        PendingValue = Pending
 
 
        Dim ConnStr As String = System.Configuration.ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString
        Dim mySqlConn As New SqlClient.SqlConnection(ConnStr)
        mySqlConn.Open()
        Dim SQL As String = "sp_UpdatePending"
        Dim mySqlCmd As New SqlClient.SqlCommand(SQL, mySqlConn)
        mySqlCmd.CommandType = CommandType.StoredProcedure
 
        Dim mySqlParamPending As New SqlClient.SqlParameter("@Pending", SqlDbType.Int)
        Dim mySqlParamImageID As New SqlClient.SqlParameter("@ImageID", SqlDbType.Int)
 
        mySqlCmd.Parameters.Add(mySqlParamPending).Value = PendingValue
        mySqlCmd.Parameters.Add(mySqlParamImageID).Value = id
        mySqlCmd.ExecuteNonQuery()
        mySqlConn.Close()
 
        AllPendingImages.EditItemIndex = -1
         ItemsGet()
'End if
    End Sub