RadGrid with GridDropDownColumn when expanding row

[Alex Vr]

Hello Everyone,
First of all thanking for the great support from the Telerik team.

I have a problem with RadGrid when I'm using it with GridDropDownColumn.

My scenario:
I have a grid with GridDropDownColumn column. I load the values of  the ComboBox during ItemDataBound event and and select the values from it if I'm in edit mode. In this situation I don't see the text of this column in the grid table.
So I added in the ItemDataBound event a check if the item is GridDataItem and then set the GridDataItem.Text  to the right value (The text should be a little bit different from the text used in the ComboBox). It works OK now and showing the text in the Grid table.
Now I face another problem, I have NestedTemplate in this grid. When I expand the column the text of the GridDropDownColumn column disapears... How can I resolve this problem?

My code:

protected void AttributesRadGrid_ItemDataBound(object sender, GridItemEventArgs e)
    {
        if (e.Item is GridEditableItem && e.Item.IsInEditMode)
        {
            GridEditableItem editedItem = e.Item as GridEditableItem;
            GridEditManager editMan = editedItem.EditManager;

            GridDropDownListColumnEditor fieldTypeEditor = editMan.GetColumnEditor("FieldType") as GridDropDownListColumnEditor;
            GridDropDownListColumnEditor attributeCategoryIDEditor = editMan.GetColumnEditor("AttributeCategoryID") as GridDropDownListColumnEditor;

            fieldTypeEditor.ComboBoxControl.Items.Add(new RadComboBoxItem("Text", "0"));
            fieldTypeEditor.ComboBoxControl.Items.Add(new RadComboBoxItem("Yes/No", "1"));
            fieldTypeEditor.ComboBoxControl.Items.Add(new RadComboBoxItem("Multi Yes/No", "2"));
            fieldTypeEditor.ComboBoxControl.Items.Add(new RadComboBoxItem("Select", "3"));

            FillAttributeCategoriesComboBox(attributeCategoryIDEditor.ComboBoxControl);

            if (e.Item.RowIndex != -1)
            {
                CellphonesCL.Database.attributes attr = (CellphonesCL.Database.attributes)e.Item.DataItem;

                fieldTypeEditor.ComboBoxControl.SelectedValue = attr.FieldType.ToString();
                attributeCategoryIDEditor.ComboBoxControl.SelectedValue = attr.AttributeCategoryID.ToString();
            }
        }
        else if (e.Item is GridDataItem)
        {
            GridDataItem dataItem = e.Item as GridDataItem;
            CellphonesCL.Database.attributes attr = (CellphonesCL.Database.attributes)e.Item.DataItem;

            dataItem["AttributeCategoryID"].Text = attr.attributecategories.Title;
            dataItem["FieldType"].Text = attributes.GetAttributeFieldTypeStr((AttributeFieldType)attr.FieldType);
        }
    }

Regards,
Alex.

[Alex Vr]

Anyone?

[Radoslav]

Hi Alex,

When you set the Text property of the dataItem["FieldType"] cell into GridItemDataBound event handler you replace the default rendered Literal control into the dataItem["FieldType"].Controls collection. Then when you expand the nested item the Literal control is rendered again on GridItemCreated event and the value in Text property is lost. To achieve the desired functionality you need to set the value to the (dataItem["FieldType"].Controls[0] as Literal).Text property:

else if (e.Item is GridDataItem)
{
   GridDataItem dataItem = e.Item as GridDataItem;
   CellphonesCL.Database.attributes attr = (CellphonesCL.Database.attributes)e.Item.DataItem;

   (dataItem["AttributeCategoryID"].Controls[0] as Literal).Text = attr.attributecategories.Title;
   (dataItem["FieldType"].Controls[0] as Literal).Text = attributes.GetAttributeFieldTypeStr((AttributeFieldType)attr.FieldType);
}

Please give it try and let me know if the issue still persists.

Kind regards,
Radoslav
the Telerik team

[Alex Vr]

Hi Radoslav,

Thanks, it works OK now.

Best Regards,
Alex