Telerik gridview checkbox needs to persistant.

[Siva]

Hi admin and all,

I have a rad grid with a check box in each row. whenever I change page or scroll, the checkboxes loose their selected state. How can I handle that?. Small additional information i am using virtual scrolling and virtual paging in radgrid.

This is an urgent requirement for me. Give reply as soon as possible.
Thanks and Regards,

[Princy]

Hi Siva,

Please try the below example code snippet to get the checkbox item to keep its state on paging or scrolling.

ASPX:

<telerik:RadGrid ID="RadGrid1" runat="server"  AllowPaging="true"
    AutoGenerateColumns="false" OnPreRender="RadGrid1_PreRender">
    <MasterTableView DataKeyNames="OrderID">
        <Columns>
            <telerik:GridBoundColumn DataField="OrderID" HeaderText="OrderID" UniqueName="Name">
            </telerik:GridBoundColumn>
            <telerik:GridTemplateColumn>
                <ItemTemplate>
                    <asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True" CausesValidation="false"
                        OnCheckedChanged="CheckBox1_CheckedChanged" />
                </ItemTemplate>
            </telerik:GridTemplateColumn>
        </Columns>
    </MasterTableView>
    <ClientSettings Scrolling-EnableVirtualScrollPaging="true" Scrolling-AllowScroll="true">
    </ClientSettings>
</telerik:RadGrid>
<asp:Label ID="Label1" runat="server" Text=""></asp:Label><%--To display the rows checked--%>

C#:

public string _SelectedID

{

    set

    {

        ViewState["SelectedID"] = value;

    }

    get

    {

        if (ViewState["SelectedID"] != null)

        {

            return Convert.ToString(ViewState["SelectedID"]);

        }

        else

        {

            return ",0,";

        }

    } 

}

      

protected void RadGrid1_PreRender(object sender, EventArgs e)

{ 

    foreach (GridDataItem item in RadGrid1.Items)

    {

        if (_SelectedID.Contains("," + Convert.ToInt32(item.GetDataKeyValue("OrderID")).ToString() + ","))

        {

            ((CheckBox)item.FindControl("CheckBox1")).Checked = true;

        }

    }

  

}

        

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)

{

    CheckBox CheckBox1 = sender as CheckBox;

    GridDataItem item = (GridDataItem)CheckBox1.NamingContainer;

    int ID = Convert.ToInt32(item.GetDataKeyValue("OrderID"));

    if (CheckBox1.Checked)

    {

        _SelectedID += ID.ToString() + ",";

        Label1.Text = _SelectedID.ToString();//To display the rows checked Using DatakeyValue of a column

    }

    else

    {

        _SelectedID += _SelectedID.Replace(ID.ToString() + ",", "");

    }

}

Hope this helps,let me know if any concern.

Thanks,
Princy

[Siva]

Thank You Sir,

[Rod]

I believe the last line in Princy's solution should read "=" instead of "+="  - thanks Princy, this really helped!

_SelectedID = _SelectedID.Replace(ID.ToString() + ",", "");