Persisting Expanded/Collapsed groups.

[Alan]

I would like to know if it's possible to persist expanded or collapsed groups on postback.

Basically whenever I set a filter or start editing a record a postback occurs and all the groups are set to default (expanded).

Here's my grid code.

    <telerik:RadGrid ID="timesheetGrid" runat="server" GridLines="None" Skin="Windows7"
        AllowSorting="True" ShowGroupPanel="True" AutoGenerateColumns="False" AllowPaging="True"
        PageSize="15" ShowStatusBar="True" AllowFilteringByColumn="True" AllowMultiRowSelection="True"
        OnNeedDataSource="timesheetGrid_NeedDataSource" OnPreRender="timesheetGrid_PreRender"
        ViewStateMode="Enabled" HeaderStyle-HorizontalAlign="Center" OnEditCommand="timesheetGrid_EditCommand">
        <ClientSettings EnableRowHoverStyle="true" AllowColumnsReorder="True" ReorderColumnsOnClient="True"
            AllowDragToGroup="True">
            <Selecting AllowRowSelect="True" />
            <ClientEvents OnRowDblClick="RowDblClick" />
        </ClientSettings>
        <MasterTableView DataKeyNames="ID" EditMode="EditForms">
            <RowIndicatorColumn>
                <HeaderStyle Width="20px"></HeaderStyle>
            </RowIndicatorColumn>
            <ExpandCollapseColumn>
                <HeaderStyle Width="20px"></HeaderStyle>
            </ExpandCollapseColumn>
            <CommandItemSettings ExportToPdfText="Export to Pdf"></CommandItemSettings>
            <Columns>
                <telerik:GridClientSelectColumn UniqueName="ClientSelectColumn" />
                <telerik:GridBoundColumn DataField="ID" HeaderText="ID" UniqueName="ID" Visible="True"
                    ReadOnly="true" FilterControlWidth="30px" HeaderStyle-Width="50px">
<HeaderStyle Width="50px"></HeaderStyle>
                </telerik:GridBoundColumn>
                <telerik:GridDateTimeColumn DataField="Date" DataType="System.DateTime" HeaderText="Date"
                    UniqueName="DateFrom" ReadOnly="true" DataFormatString="{0:dd/MM/yyyy}" AllowFiltering="false"
                    HeaderStyle-Width="75px">
                    <HeaderStyle Width="75px"></HeaderStyle>
                </telerik:GridDateTimeColumn>
                <telerik:GridBoundColumn DataField="User.UserName" HeaderText="User" UniqueName="User"
                    ReadOnly="true">
                </telerik:GridBoundColumn>
                <telerik:GridNumericColumn UniqueName="Duration" HeaderText="Duration (Hrs)" DataType="System.Double"
                    DataField="Duration" FilterControlWidth="50px">
                    <HeaderStyle Width="80px"></HeaderStyle>
                    <ItemStyle HorizontalAlign="Right" />
                </telerik:GridNumericColumn>
                <telerik:GridBoundColumn DataField="ShortDescription" HeaderText="Description" UniqueName="Description">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="DocketNo" HeaderText="Docket No" UniqueName="DocketNo"
                    ReadOnly="true" FilterControlWidth="50px" HeaderStyle-Width="70px">
<HeaderStyle Width="70px"></HeaderStyle>
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="FileCode" HeaderText="FileCode Name" UniqueName="FileCode"
                    HeaderStyle-Width="100px" FilterControlWidth="60px">
<HeaderStyle Width="100px"></HeaderStyle>
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="FileCodeID" HeaderText="FileCode ID" UniqueName="FileCodeID"
                    Visible="false">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="CostCenter" HeaderText="Cost Center" UniqueName="CostCenter"
                    HeaderStyle-Width="70px" FilterControlWidth="40px">
<HeaderStyle Width="70px"></HeaderStyle>
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="CostCenterID" HeaderText="Cost Center ID" UniqueName="CostCenterID"
                    Visible="false">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="CompanyID" HeaderText="Company ID" UniqueName="CompanyID"
                    Visible="false">
                </telerik:GridBoundColumn>
                <telerik:GridCheckBoxColumn DataField="IsOvertime" DataType="System.Boolean" HeaderText="Overtime"
                    UniqueName="Overtime" ReadOnly="true">
                </telerik:GridCheckBoxColumn>
            </Columns>
            <EditFormSettings UserControlName="UserControls/TimesheetEdit.ascx" EditFormType="WebUserControl">
                <EditColumn FilterControlAltText="Filter EditCommandColumn column">
                </EditColumn>
            </EditFormSettings>
        </MasterTableView>
        <HeaderStyle HorizontalAlign="Center"></HeaderStyle>
        <PagerStyle Mode="NumericPages" VerticalAlign="Bottom" />
        <FilterMenu EnableImageSprites="False">
        </FilterMenu>
        <HeaderContextMenu CssClass="GridContextMenu GridContextMenu_Windows7">
        </HeaderContextMenu>
    </telerik:RadGrid>

Thanks in advance.

Daryl

[Pavlina]

Hi Daryl,

Here is a code library submission which explains how to retain the Groups Expanded State on Rebind using server side approach. Go through it and see if it meets your requirement.
Persist Groups Expanded State on Rebind

Best wishes,
Pavlina
the Telerik team