Hierarchic Custom Pages Menu

block.py

'''
 other blocks ...
'''
class CustomPagesMenuBlock(StructBlock):
    menus=ListBlock(StructBlock([
        ("pg", PageChooserBlock(default=None, blank=True, null=True, required=False, label="Menu", help = "height for this video embed object")),
        ("children", ListBlock(StructBlock([
            ("pg", PageChooserBlock(default=None, blank=True, null=True, required=False, label="Sub-Menu")),
            ("children", ListBlock(StructBlock([
                ("pg", PageChooserBlock(default=None, blank=True, null=True, required=False, label="Sub-Sub-Menu")),
            ])))
        ])))
    ]))

    class Meta:
        icon = ""
        template = "blocks/custom_pages_menu_block.html"
        
'''
 other blocks ...
'''

custom_pages_menu_block.html

<ul class="custom_nav">
  {% for menu in self.menus %}
  <li class="top_menu">
    {% if not menu.children %}
      <li class="top_menu_item"><a href="{{menu.pg.url}}" class="pg_lin">{{ menu.pg }}</a></li>
    {% else %}
      <li class="top_menu_item has_sub_pgs"><a href="{{menu.pg.url}}" class="pg_lin">{{ menu.pg }}</a>
        <ul class="sub_pgs">
          {% for spg in menu.children %}
            {% if not spg.children %}
              {% if spg.pg %} <li class="sub_page"><a href="{{spg.pg.url}}" class="pg_lin">{{spg.pg}}</a></li> {% endif %}
            {% else %}
            {% if spg.pg %} <li class="top_menu_item has_sub_pgs"><a href="{{spg.pg.url}}" class="pg_lin">{{ spg.pg }}</a> {% endif %}
              <ul class="sub_pgs">
                {% for sspg in spg.children %}
                {% if sspg.pg %}<li class="sub_page"><a href="{{sspg.pg.url}}" class="pg_lin">{{sspg.pg}}</a></li>{% endif %} 
                {% endfor %}
              </ul>
            {% endif %}
          {% endfor %}
        </ul>
      </li>
    {% endif %}
  </li>
  {% endfor %}
</ul>

though the block is implemented inside an instance of pages model, however, this implementation can be applied to siteSettings as well, in a way you can call the instances of each single site publicly in the base.html sections other than the specific page streamfield sections