public MenuParentFormSelectorInterface::parentSelectElement($menu_parent, $id = '', array $menus = NULL)
Gets a form element to choose a menu and parent.
The specific type of form element will vary depending on the implementation, but callers will normally need to set the #title for the element.
string $menu_parent: A menu name and parent ID concatenated with a ':' character to use as the default value.
string $id: (optional) ID of a link plugin. This will exclude the link and its children from being selected.
array $menus: (optional) array of menu names as keys and titles as values to limit the values that may be selected. If NULL, all menus will be included.
array A form element to choose a parent, or an empty array if no possible parents exist for the given parameters. The resulting form value will be a single string containing the chosen menu name and parent ID separated by a ':' character.
public function parentSelectElement($menu_parent, $id = '', array $menus = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Menu!MenuParentFormSelectorInterface.php/function/MenuParentFormSelectorInterface::parentSelectElement/8.1.x