Save Grid Settings Render call fails

[mac]

hey.. I am attempting to get my grid to save their custom grouped setting for each of my users via the asp.net profile objects. this works for me when i am not using the ajax manager. (I am using the grid settings persistor sample for the guidelines. )
My question is this.. how to save the grid settings when the ajax call avoids the Render Sub.. I hae tried the goups changing but found that really ugly as you would have to apply it on each grid in the page.  ( it also blew up each time saying the object no longer existed if you moved an item out)
If you have any ideas I would appreciate hearing them
.class file

Imports Microsoft.VisualBasic
'Namespace WebApplication1
Imports System
Imports System.Collections
Imports System.IO
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports Telerik.Web.UI


Public Class GridSettingsPersister

    Private gridInstance As RadGrid

    Public Sub New(ByVal gridInstance As RadGrid)
        MyBase.New()
        Me.gridInstance = gridInstance
    End Sub

    'this method should be called on Render
    Public Function SaveSettings() As String
        Dim gridSettings() As Object = New Object((4) - 1) {}
        'Save groupBy
        Dim groupByExpressions As GridGroupByExpressionCollection = gridInstance.MasterTableView.GroupByExpressions
        Dim groupExpressions() As Object = New Object((groupByExpressions.Count) - 1) {}
        Dim count As Integer = 0
        For Each expression As GridGroupByExpression In groupByExpressions
            groupExpressions(count) = CType(expression, IStateManager).SaveViewState
            count = (count + 1)
        Next
        gridSettings(0) = groupExpressions
        'Save sort expressions
        gridSettings(1) = CType(gridInstance.MasterTableView.SortExpressions, IStateManager).SaveViewState
        'Save columns order
        Dim columnsLength As Integer = (gridInstance.MasterTableView.Columns.Count + gridInstance.MasterTableView.AutoGeneratedColumns.Length)
        Dim columnOrder() As Pair = New Pair(columnsLength - 1) {}

        Dim allColumns As ArrayList = New ArrayList(columnsLength)
        allColumns.AddRange(gridInstance.MasterTableView.Columns)
        allColumns.AddRange(gridInstance.MasterTableView.AutoGeneratedColumns)
        Dim i As Integer = 0
        For Each column As GridColumn In allColumns
            Dim p As Pair = New Pair
            p.First = column.OrderIndex
            p.Second = column.HeaderStyle.Width
            columnOrder(i) = p
            i = (i + 1)
        Next
        gridSettings(2) = columnOrder
        'Save filter expression
        gridSettings(3) = CType(gridInstance.MasterTableView.FilterExpression, Object)

        Dim formatter As LosFormatter = New LosFormatter
        Dim writer As StringWriter = New StringWriter
        formatter.Serialize(writer, gridSettings)
        Return writer.ToString
    End Function

    'this method should be called on PageInit
    Public Sub LoadSettings(ByVal settings As String)
        Dim formatter As LosFormatter = New LosFormatter
        Dim reader As StringReader = New StringReader(settings)
        Dim gridSettings() As Object = CType(formatter.Deserialize(reader), Object())
        'Load groupBy
        Dim groupByExpressions As GridGroupByExpressionCollection = Me.gridInstance.MasterTableView.GroupByExpressions
        groupByExpressions.Clear()
        Dim groupExpressionsState() As Object = CType(gridSettings(0), Object())
        Dim count As Integer = 0
        For Each obj As Object In groupExpressionsState
            Dim expression As GridGroupByExpression = New GridGroupByExpression
            CType(expression, IStateManager).LoadViewState(obj)
            groupByExpressions.Add(expression)
            count = (count + 1)
        Next
        'Load sort expressions
        Me.gridInstance.MasterTableView.SortExpressions.Clear()
        CType(Me.gridInstance.MasterTableView.SortExpressions, IStateManager).LoadViewState(gridSettings(1))
        'Load columns order
        Dim columnsLength As Integer = (Me.gridInstance.MasterTableView.Columns.Count + Me.gridInstance.MasterTableView.AutoGeneratedColumns.Length)
        Dim columnOrder() As Pair = CType(gridSettings(2), Pair())
        If (columnsLength = columnOrder.Length) Then
            Dim allColumns As ArrayList = New ArrayList(columnsLength)
            allColumns.AddRange(Me.gridInstance.MasterTableView.Columns)
            allColumns.AddRange(Me.gridInstance.MasterTableView.AutoGeneratedColumns)
            Dim i As Integer = 0
            For Each column As GridColumn In allColumns
                column.OrderIndex = CType(columnOrder(i).First, Integer)
                column.HeaderStyle.Width = CType(columnOrder(i).Second, Unit)
                i = (i + 1)
            Next
        End If
        'Load filter expression
        Me.gridInstance.MasterTableView.FilterExpression = CType(gridSettings(3), String)
    End Sub




End Class

<Serializable()> Public Class Pet
    Public Sub New()
        ' default ctor required for serializer
    End Sub

    Private _names As New Hashtable()
    Public Property Names() As Hashtable
        Get
            Return _names
        End Get
        Set(ByVal value As Hashtable)
            _names = value
        End Set
    End Property


    Public Sub SavePetNames(ByVal Grid As RadGrid, ByVal GridName As String)
        Dim settings As New GridSettingsPersister(Grid)
        Dim settingvalue As String = settings.SaveSettings()
        _names(GridName) = settingvalue
        '   _names.Add(GridName, settingvalue)
    End Sub



End Class






'End Namespace

.ascx file

Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
        '   export.Visible = True
        For Each c As Control In Me.Controls
            If TypeOf c Is RadGrid Then
                Dim settings As New GridSettingsPersister(c)
                If Profile.Pet.Names.ContainsKey(functions.getunique(c)) Then
                    settings.LoadSettings(Profile.Pet.Names(functions.getunique(c)).ToString())
                End If
            End If
        Next

    End Sub


    Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
        MyBase.Render(writer)
        For Each c As Control In Me.Controls
            If TypeOf c Is RadGrid Then
                Profile.Pet.SavePetNames(c, functions.getunique(c))
            End If
        Next
    End Sub


Protected Sub RadGrid1_GroupsChanging(ByVal source As Object, ByVal e As Telerik.Web.UI.GridGroupsChangingEventArgs) Handles RadGrid1.GroupsChanging
'This doesn't work
    '   Profile.Pet.SavePetNames(RadGrid1, functions.getunique(RadGrid1))

    End Sub

source

<telerik:RadAjaxManager   ID="RadAjaxManager1" runat="server">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="RadGrid1">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="RadGrid1" />
            </UpdatedControls>
        </telerik:AjaxSetting>
</telerik:RadAjaxManager>

[Danny Scheelings]

I have exactly the same problem. Does anybody have a solution?
Maybe another event of the page/usercontrol which we can hook up to? Or an event of the RadAjaxManager?

Plz help !!!

Thx,
Dannu

[Danny Scheelings]

I just tried saving the settings at the OnPreRender method and it looks like this is the solution. Any ideas if there could be a problem with this?

Thx,
Danny

[Tsvetoslav]

Hi Danny,
Hello Mac,

The Render event of the page is always called no matter if an ajax request or a regular post back occurs. Our code library example (here) also uses RadAjaxManager to ajaxify the grids. Am I missing something?

Regards,
Tsvetoslav
the Telerik team

Instantly find answers to your questions on the new Telerik Support Portal.
Watch a video on how to optimize your support resource searches and check out more tips on the blogs.

[mac]

Hey Tsvetoslav,
the problem seemed to start erupting when I moved the grids into their own user controls. ie somegrid.ascx
if you have the overrires prerender in the ascx and wrapped in an ajax panel or similar, the event won't fire other than the initial load. I checked Danny's solution and it does work, you still need to have the ovverrides event and savesettings. Anyway, from the way I can recall this was the issue. The problem presents when posting back from a usercontrol
webusercontrol.ascx.vb code

Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
        For Each c As Control In pnl.Controls
            If TypeOf c Is RadGrid Then

                Dim settings As New GridSettingsPersister(c)
    if Profile.Pet.Names.ContainsKey(getunique(c)) Then
    settings.LoadSettings(Profile.Pet.Names(getunique(c)).ToString())
    End If

    End If
    Next
End Sub

    Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
        MyBase.Render(writer)  ' this will only fire the first time
    End Sub

    Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender
            For Each c As Control In pnl.Controls   'me.controls fails
            If TypeOf c Is RadGrid Then
                Profile.Pet.SavePetNames(c, getunique(c))
            End If
        Next
    End Sub

webusercontrol.ascx markup

 <telerik:RadAjaxPanel ID="pnl" runat="server">
                      <telerik:RadGrid  ID="RadGrid1" runat="server" DataSourceID="SqlDataSource1"
              GridLines="None" ShowGroupPanel="True" AutoGenerateColumns="False">
                  <HeaderContextMenu>
                      <CollapseAnimation Duration="200" Type="OutQuint" />
                  </HeaderContextMenu>
                  <MasterTableView DataKeyNames="ID" DataSourceID="SqlDataSource1" >
                      <Columns>
                          <telerik:GridBoundColumn DataField="ID" DataType="System.Int32" HeaderText="ID" ReadOnly="True" SortExpression="ID"
                              UniqueName="ID">
                          </telerik:GridBoundColumn>
                          <telerik:GridBoundColumn DataField="Name" HeaderText="Name" SortExpression="Name" UniqueName="Name">
                          </telerik:GridBoundColumn>
                          <telerik:GridBoundColumn DataField="AccountNo" HeaderText="AccountNo" SortExpression="AccountNo" UniqueName="AccountNo">
                          </telerik:GridBoundColumn>
                          <telerik:GridBoundColumn DataField="Balance" DataType="System.Decimal" HeaderText="Balance" SortExpression="Balance"
                              UniqueName="Balance">
                          </telerik:GridBoundColumn>
                          <telerik:GridBoundColumn DataField="InsertDate" DataType="System.DateTime" HeaderText="InsertDate" SortExpression="InsertDate"
                              UniqueName="InsertDate">
                          </telerik:GridBoundColumn>
                      </Columns>
                  </MasterTableView>
                  <ClientSettings AllowDragToGroup="True">
                  </ClientSettings>
                  <FilterMenu>
                      <CollapseAnimation Duration="200" Type="OutQuint" />
                  </FilterMenu>
              </telerik:RadGrid>
            </telerik:RadAjaxPanel>

and finally page.aspx

<%

@ Register Src="WebUserControl.ascx" TagName="WebUserControl" TagPrefix="uc1" %>

 

 

<uc1:WebUserControl ID="WebUserControl1" runat="server" />

 

[Tsvetoslav]

Hi mac,

You can still use the Page's Render event, not the user controls'. You just need to get a reference of the user control, find the grid in it and load the settings from the profile.

Regards,
Tsvetoslav
the Telerik team

Instantly find answers to your questions on the new Telerik Support Portal.
Watch a video on how to optimize your support resource searches and check out more tips on the blogs.