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Accessing RadComboBox Inside RadGrid FilterTemplate

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Holly
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Holly asked on 26 Aug 2015, 01:21 PM

Hi I am trying to add add a RadComboxBox to my RadGrid filtertemplate in a bound column.  For some reason in the code behind I can not access the RadComboBox.  It keeps coming back null.  I'm not sure what I'm doing wrong.  Here is my code.

<telerik:GridBoundColumn SortExpression="Product_Name" HeaderText="Product Name" DataField="Product_Name" UniqueName="ProductName">
                             <FilterTemplate>                                 
                                <telerik:RadComboBox runat="server" ID="cmbProductName" CheckBoxes="true" ClientIDMode="Static" 
                                     AppendDataBoundItems="true" DataValueField="Product_Name" EnableCheckAllItemsCheckBox="true">                                
                                </telerik:RadComboBox>
                            </FilterTemplate>
                        </telerik:GridBoundColumn>

 

 foreach (var cat in CatProdList)
            {               
                var itemCategory = new RadComboBoxItem(cat.Category.Name);

                var option = cat.ProdAttributesTuple.GroupBy(a => a.Item2.Attribute.Value).ToList();
                foreach (var attr in option)
                {
                    if (e.Item is GridDataItem)
                    { 
                        RadComboBox cmbProductName = (RadComboBox)e.Item.FindControl("cmbProductName");                      

                        var item = new RadComboBoxItem(attr.Key);

                        cmbProductName.Items.Add(item);                    
                    
                    }
                        
                }
            }     

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Eyup
Telerik team
answered on 31 Aug 2015, 10:26 AM
Hi Holly,

The combo is not located in a GridDataItem, but within a GridFilteringItem. You can get a reference to the GridFilteringItem during ItemDataBound event handler of the grid using the if(e.Item is GridFilteringItem) or during PreRender:
http://docs.telerik.com/devtools/aspnet-ajax/controls/grid/how-to/using-the--getitems-getcolumn-and-getcolumnsafe-methods

Generally, you can check the following live sample for implementing filtering with combo:
http://demos.telerik.com/aspnet-ajax/grid/examples/functionality/filtering/filter-templates/defaultcs.aspx

I suggest that you also check the samples provided in the following post:
http://www.telerik.com/forums/how-to-persist-dropdownlist-selected-index-and-value-on-postback-from-radgrid-filtertemplate#GW3MyQLmVEmy8XzsmrHzeQ         


Hope this helps.

Regards,
Eyup
Telerik
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Holly
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answered on 31 Aug 2015, 03:09 PM

Ok.  This is what I have now and it is still not working.

<telerik:GridBoundColumn SortExpression="Product_Name" HeaderText="Product Name" DataField="Product_Name" UniqueName="ProductName" AllowFiltering="true">
                                    <FilterTemplate>
                                        <telerik:RadComboBox runat="server" ID="cmbProductName"></telerik:RadComboBox>
                                    </FilterTemplate>                                         
                        </telerik:GridBoundColumn>

 

            foreach (var cat in CatProdList)
            {
                //var itemCategory = new RadComboBoxItem(cat.Category.Name);

                var option = cat.ProdAttributesTuple.GroupBy(a => a.Item2.Attribute.Value).ToList();
                foreach (var attr in option)
                {
                    foreach (GridFilteringItem filterItem in RadGridDiscounts.MasterTableView.GetItems(GridItemType.FilteringItem))
                    {
                        //RadComboBox cmbProductName = (e.Item as GridFilteringItem).FindControl("cmbProductName") as RadComboBox;
                        var cmbProductName = (RadComboBox)filterItem.FindControl("cmbProductName");
                        var item = new RadComboBoxItem(attr.Key);


                        if (cmbProductName != null)
                        {
                            cmbProductName.Items.Add(item);
                        }
                    }
                }
            }

 

‚ÄčThe data is coming back fine, but cmbProductName is still coming back as null.  What am I doing wrong?  Thank you.

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Eyup
Telerik team
answered on 03 Sep 2015, 10:30 AM
Hi Holly,

I've created a sample RadGrid web site to test the described behavior. Please run the attached application and let me know about the result.

Regards,
Eyup
Telerik
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Holly
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Holly
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