Limiting filter predicates

[IT Department]

Is there a way to limit or hide the default filter predicates that are displayed? I have no use for Is Null, Is Not Null, or the custom option.

[Jack]

Hello Grant Fish,

Please find the answer to this question in your support ticket concerning the same topic (Ticket ID 321931). If you have any other questions, we will be glad to help.

Best wishes,
Jack
the Telerik team

[Anisha]

Is it possible to post this answer in the forum? I would also like to know how to limit filter predicates.

Thanks
Anisha 

[Jack]

Hi Anisha,

Yes, here is the answer:

You can customize the available filter actions by handling the ContextMenuOpening event. When handling this event, you have full control over the context menu and can hide or disable any item. Consider the sample below:

void radGridView1_ContextMenuOpening(object sender, ContextMenuOpeningEventArgs e)
{
    if (e.ContextMenuProvider == null)
    {
        string isNullName = RadGridLocalizationProvider.CurrentProvider.GetLocalizedString(RadGridStringId.FilterFunctionIsNull);
        RadMenuItem item = FindMenuItem(e.ContextMenu, isNullName);
        if (item != null)
        {
            item.Enabled = false;
        }
    }
}

private RadMenuItem FindMenuItem(RadDropDownMenu menu, string itemName)
{
    foreach (RadMenuItem item in menu.Items)
    {
        if (item.Text == itemName)
        {
            return item;
        }
    }
    return null;
}

You have a point, we have to implement a more convenient API that allows for customizing the available filter predicates. We will also update our documentation. Please share your opinion on how such an API should look like and should behave. We will consider your feedback when planning our future releases.


Sincerely yours,
Jack
the Telerik team