Change textbox filter by RadComboBox

[Andy]

Hi all!

I'm adding the filter for my RadGrid by set AllowFilteringByColumn="True"
However, it uses the textbox which is not good so much in some cases.
I see the RadComboBox allows user to search data by using its own Filter. So I would like to apply RadComboBox into the FIlter
Is there any ways to replace the textbox by RadComboBox ?

Thanks!

Andy.

[Pavlina]

Hello Andy,

In Telerik RadGrid you can enable dropdown filters for GridBoundColumns (or those columns which inherit from GridBoundColumns like GridDateTimeColumn, GridNumericColumn, etc.) and GridTemplateColumns declaratively - just set AllowFilteringByColumn = true for the entire grid and define FilterTemplate for the columns in question. Review the links below for more information:
Filter templates
Filter templates - help topic

I hope this helps.

All the best,
Pavlina
the Telerik team

[Andy]

Thanks Pavlina!

I try to do it now

Andy.

[asilioni]

Hi,
I am using a radcombobox for filtering radgrid. The filter works fine but after the selection of the radcombobox, it looses the selected value.  Each radcombobox item, contains an image and a title, that's why i fill in the radcombobox in the ItemDataBound event (so i can set the Item.Image value).  This is probably happens because in the ItemDataBound event the radcombobox is populated again with the values. How can i keep the selected value?

Thanks a lot,
Angie

<FilterTemplate>

                                <telerik:RadComboBox runat="server"

                                 ID="cboIcon"

                                 DataTextField="ConsultStatus"

                                 Text='<% Eval("ConsultStatus")%>'

                                 DataValueField="ConsultStatus"

                                 OnClientSelectedIndexChanged="IconIndexChanged"

                                 OnSelectedIndexChanged="cboIcon_SelectedIndexChanged">

                                </telerik:RadComboBox>



                                <telerik:RadScriptBlock ID="RadScriptBlock2" runat="server">



                                <script type="text/javascript">

                                    function IconIndexChanged(sender,args) {

                                        var tableView = $find("<%# ((GridItem)Container).OwnerTableView.ClientID %>");

                                        var filterVal = args.get_item().get_value();



                                        if (filterVal == "0") {

                                            tableView.filter("ConsultStatus", "Σε εξέλιξη", "EqualTo");

                                        }

                                        else if (filterVal == "1") {

                                            tableView.filter("ConsultStatus", "Υπό έγκριση", "EqualTo");

                                        }

                                        else if (filterVal == "2") {

                                            tableView.filter("ConsultStatus", "Προς δημιουργία εγκυκλίου", "EqualTo");

                                        }

                                        else if (filterVal == "3") {

                                            tableView.filter("ConsultStatus", "Κλειστές", "EqualTo");

                                        }

                                        else if (filterVal == "4") {

                                            tableView.filter("ConsultStatus", "Ακυρωμένες", "EqualTo");

                                        }



                                    }

                                </script>



                            </telerik:RadScriptBlock>



                                </

[Pavlina]

Hello,

You can store the combo box selected value in session/ViewState, and in the PreRender event handler for the grid, get a reference to it, and restore its value.

All the best,
Pavlina
the Telerik team

[asilioni]

Hi Pavlina,
after testing your suggestion again and again I get the following error from the web page ang the filters do not work at all.. The error is the following:

Sys.WebForms.PageRequestManagerServerErrorException: an item with the same key has already been added

Could you please help me? I'm sending you the code that i have added.

Thanks a lot,
Angie

/// <summary>
        /// When selected consultation type in radcombobox changes, we need to store the selected value to a session
        /// and set it as selected in the OnPreRender event
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void cboType_SelectedIndexChanged(object sender, EventArgs e)
        {
            RadComboBox cbo = (RadComboBox)sender;
            Session["cboTypeSelectedValue"] = cbo.SelectedValue;
        }

        /// <summary>
        /// Set the value stored in session as the selected value of the radcombobox
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void cboType_PreRender(object sender, EventArgs e)
        {
            RadComboBox cbo = (RadComboBox)sender;

            if (Session["cboTypeSelectedValue"] != null)
                cbo.SelectedValue = Session["cboTypeSelectedValue"].ToString();
        }

[asilioni]

Hi Pavlina,
finally I solved my problem!! The reason for the exception was that my page was not approved!!

Thanks anyway!