wp_dropdown_categories. How to make parents not selectable

  • Hi!

    I have a wp_dropdown_categories which lists (posts)category tree, with parents and childs categories.

    Example:
    Suppose a tree of countries as parents and cities as childs, where each city has some posts representing places of that city.

    -France
    -Italy
    -Spain (3)
    –Barcelona (5)
    –Madrid (6)
    –Valencia (5)

    If I select Spain it brings me to Barcelona’s posts page (which is the first child of Spain)

    Is there any way to prevent parents to be selected?

    Thx in advance.

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