Полный адрес в одном поле. Результат - почтовый индекс, регион, город, улица и дом автоматически разложить по скрытым полям.

// Ваш api ключ из лк дадаты https://dadata.ru/#registration_popup
var token = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

function join(arr /*, separator */) {
  var separator = arguments.length > 1 ? arguments[1] : ", ";
  return arr.filter(function(n){return n}).join(separator);
}

function showPostalCode(address) {
  $("#shipping_address_postcode").val(address.postal_code);
}

function showRegion(address) {
  $region = $("#shipping_address_zone_id");
  
  if ($region.length 
      && typeof(address.region) !== 'undefined' 
     	&& address.region) {
    		var result = address.region.replace(/\s{0,1}[-\/].+/gi, '').toLowerCase();
    		$region.find('option').each(function (i, o) {
          if ($(o)
              .text()
              .toLowerCase()
              .search(result) >= 0
             )
            $(this).attr('selected', true);
        	else
            $(this).attr('selected', false);
        });
  };
}

function showCity(address) {
  $("#shipping_address_city").val(join([
    join([address.city_type, address.city], " "),
    join([address.settlement_type, address.settlement], " ")
  ]));
}

function showAddress(address) {
  insert = '';

  if (typeof(address.settlement) !== 'undefined'
     	&& address.settlement)
    insert += join([address.settlement_type, address.settlement], " ")
  
  insert += join([
    join([address.street_type, address.street], " "),
    join([address.house_type, address.house], " ")
  ])
  
  if (parseInt(address.block) > 0)
    insert += join([address.block_type, address.block], " ");
  
  if (parseInt(address.flat) > 0)
    insert += join([address.flat_type, address.flat], " ");
  
  $("#shipping_address_address_1").val(insert);
}

// function showStreet(address) {
//   $("#shipping_address_street").val(
//     join([address.street_type, address.street], " ")
//   );
// }

// function showHouse(address) {
//   $("#house").val(join([
//     join([address.house_type, address.house], " "),
//     join([address.block_type, address.block], " ")
//   ]));
// }

// function showFlat(address) {
//   $("#flat").val(
//     join([address.flat_type, address.flat], " ")
//   );
// }
  
var cityChanged = 0;
function inputChanged(a,b,c) {
  cityChanged = 1
}

function showSelected(suggestion) {
  var address = suggestion.data;
  showPostalCode(address);
  showRegion(address);
  showCity(address);
  showAddress(address);
  // showStreet(address);
  // showHouse(address);
  // showFlat(address);
  
  if (cityChanged) 
    reloadAll()
}

$("#shipping_address_address_2").suggestions({
  token: token,
  type: "ADDRESS",
  onSelect: showSelected,
  beforeRender: inputChanged
});