RadComboBox for custom RadFilterDataFieldEditor changing to Textbox

[Lee]

I have a RadFilter with a custom FieldEditor control inside the <FieldEditors></FieldEditors> tags.

The custom field control is a class inherited from RadFilterDataFieldEditor.

In the InitializeEditor(System.Web.UI.Control container) method, a RadComboBox is instantiated and
added to the Controls collection of the container parameter.   The DataTextField property of the RadComboBox is text while the DataValueField property of the RadComboBox is a numeric value corresponding to the text's numeric ID.

When a filter expression is added, the dropdown listbox is displayed for selecting the filter value as the text.  However once the RadFilter Apply button is clicked on postback, the combobox changes to a textbox with the numeric value.

Can't figure out why this is happening.  Could use some help!  Thanks in advance.

 

[Tsvetina]

Hello Lee,

This sounds like a problem related to instantiating the field editor correctly. Can you confirm that you follow closely the event sequence from our sample of custom field editors:
Filter / Custom Field Editors

Make sure that you either declare the editor in mark-up, or declare it on initial Page_Load:

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        RadFilterDropDownEditor dropDownFieldEditor = new RadFilterDropDownEditor();
        RadFilter1.FieldEditors.Add(dropDownFieldEditor);
        dropDownFieldEditor.FieldName = "Country";
        dropDownFieldEditor.DataTextField = "Country";
        dropDownFieldEditor.DataValueField = "Country";
        dropDownFieldEditor.DataSource = GetEmployeesDataTable().DefaultView.ToTable(true, "Country");
     }
}

Then, on FieldEditorCreating you should always instantiate the editor:

protected void RadFilter1_FieldEditorCreating(object sender, RadFilterFieldEditorCreatingEventArgs e)
{
    if (e.EditorType == "RadFilterDropDownEditor")
    {
        e.Editor = new RadFilterDropDownEditor();
    }
}

Additionally, when following these instructions, make sure that you have ViewState enabled for the filter.

All the best,
Tsvetina
the Telerik team