[Solved] GridDropDownColumn DropDownList height defaults to longer than the items list

[Rob T]

By default it appears the GridDropDownColumn DropDownList height defaults to a particular height.  This ends up displaying blank space beneath the items in the DropDownList when there are only a few items in the list.

How do  i configure the GridDropDownColumn or its DropDownList to have a height that is equal to the size of the items in the list?

[Shinu]

Hello Rob,

I assume that you have null values in the table, and that is the cause of showing blank spaces in dropdown. If that the case, give a try with following code and see whether it helps.

ASPX:

    <telerik:GridDropDownColumn HeaderText="Dropdown" UniqueName="Dropdown" DataField="Region" DataSourceID="SqlDataSource1"
        ListValueField="Region" ListTextField="Region">
    </telerik:GridDropDownColumn>

CS:

protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)
    {
        if (e.Item is GridEditFormItem && e.Item.IsInEditMode)
        {
            GridEditFormItem editItem = e.Item as GridEditFormItem;
            RadComboBox combo = (RadComboBox)editItem["Dropdown"].Controls[0];
            foreach (RadComboBoxItem comboItem in combo.Items)
            {
                if (comboItem.Text == "")
                {
                    comboItem.Visible = false;
                }
            }
        }
    }

Feel free to share the comments,
Shinu.