<div class="parent_block">
  <div class="button"></div>
  <div class="toggled_block"></div>
</div>

$(function(){
  $(".pageMenu li.active").click(function() {
    $('.select-city').toggle();
  });
  $(document).on('click', function(e) {
    if (!$(e.target).closest(".pageMenu").length) {
      $('.select-city').hide();
    }
    e.stopPropagation();
  });
});