How to prevent delete parent if parent have childs in pages

You could hook into DocumentEvents Delete Before event, do a check for child pages and cancel deleting of the page.

Probably this is not the best option as it won't show any alert/message on the UI, but it will prevent deleting of a page.

Thank you Roman Hutnyk, I did it but getting some issues

When I select any pages to delete.

• select Category to delete => it always get last NodeID (get App NodeID)
• select Sub Category to delete => It always still get last NodeID (get App NodeID)

I want to get the current NodeID but I can't . Ex: I want to get NodeID of Category when I click delete Category.

How can I do it.

Thank you for your help again.

Thank you Roman Hutnyk, but I can not find out the TreeNode. Could you please provide me or tell me the method name.

Thank you again

See the example of document insert event: https://docs.kentico.com/k12/custom-development/handling-global-events

Delete handler works the same way.

 private void Document_Insert_After(object sender, DocumentEventArgs e)
{
    // Add custom actions here
}

DocumentEventArgs e parameter that is passed to the method contains reference to the document you're making action with:

e.Node

Hope that helps.

Thank youRoman Hutnyk

you miss understand me

• category : e.Node.NodeID = 1
• sub category: e.Node.NodeID = 2
• app: e.Node.NodeID = 3

When I click delete on any pages: it always show e.Node.NodeID = 3

How can I get the nodeID of selected pages. In Document_Update_After case It get the right NodeID. Document_Delete case is not get right current NodeID

Thank you so much

that's interesting... probably Kentico starts to remove pages starting from the children, so your event handler has to be called for three times: app, sub category, category.

Do you know the pages you don't want to be removed? - if so, you could just setup security to deny deleting.

I'm very appreicate about your help. Yes, it call three time so that I can not handle all case.

Actually, If Category have any Sub Category, should not be deleted If Sub Category have any App, should not be deleted.

How I can setup security to deny deleting.

Thank you so much again

Not sure if you can setup conditional security... You can either apply it or not