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HTML

              
                <section class="container">
  <h1>Подсказки по адресу внутри конкретного региона</h1>
  <label for="city">Сначала выберите регион:</label>
  <input id="region" name="region" type="text" />
  <br><br>
  <label for="address">А теперь введите адрес:</label>
  <input id="address" name="address" type="text"/>
</section>

              
            
!

CSS

              
                input {
  font-size: 16px;
  padding: 4px;
}
.container {
  max-width: 500px;
}
              
            
!

JS

              
                // Замените на свой API-ключ
var token = "7fd18aaabd7d53ffa4846e4521c1f736c13490eb";

function enforceRegion(suggestion) {
  var sgt = $("#address").suggestions();
  sgt.clear();
  sgt.setOptions({
    constraints: {
      locations: { kladr_id: suggestion.data.kladr_id }
    },
    restrict_value: true
  });
}

$("#region").suggestions({
  token: token,
  type: "ADDRESS",
  bounds: "region",
  geoLocation: false,
  onSelect: enforceRegion
});

$("#address").suggestions({
  token: token,
  type: "ADDRESS"
});
              
            
!
999px

Console