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                <section class="container">
  <h1>Подсказки по индексу</h1>
  <input id="postal_code" name="postal_code" type="text" placeholder="Индекс" />


                * {
  box-sizing: border-box;

input {
  font-size: 16px;
  padding: 4px;

.container {
  width: 25em;

#address {
  width: 100%;


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

function ensurePostal(params) {
    var query = params.query;
    var digitRe = /^\d+$/;
    if (!digitRe.test(query)) {
      /* Запрос содержит не только цифры, не хотим его отправлять */
      return false;

function removeNonPostalMatches(suggestions) {
  var query = this.value;
  if (!/^\d+$/.test(query)) {
    // это запрос не по индексу, продолжаем как обычно
    return suggestions;
  // это запрос по индексу, отсеиваем неподходящие варианты   
  return suggestions.filter(function(suggestion) {
    // в подсказке нет индекса, нет оснований её отсеивать
    if (! {
      return true;
    // отсеиваем подсказку, если индекс не совпадает с запросом
    return == 0;

  token: token,
  type: "ADDRESS",
  count: 5,
  geoLocation: false,
  onSuggestionsFetch: removeNonPostalMatches