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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="biz_geo_search">
	<input type="text" id="search_location_name_list" name="search_location_name_list" aria-label="Поиск" placeholder="Введите название региона" data-result-div-id="search_location_result" data-url-rule="" autocomplete="off">
<div id="search_location_result_list"></div>

<div class="row biz_geo_cities_list"><ul id="wt-list-locations"><li><a href="#">Алтайский край</a></li><li><a href="#">Амурская область</a></li><li><a href="#">Архангельская область</a></li><li><a href="#">Астраханская область</a></li><li><a href="#">Белгородская область</a></li><li><a href="#">Брянская область</a></li><li><a href="#">Владимирская область</a></li><li><a href="#">Волгоградская область</a></li><li><a href="#">Вологодская область</a></li><li><a href="#">Воронежская область</a></li><li><a href="#">Еврейская автономная область</a></li><li><a href="#">Забайкальский край</a></li><li><a href="#">Ивановская область</a></li><li><a href="#">Иркутская область</a></li><li><a href="#">Калининградская область</a></li><li><a href="#">Калужская область</a></li><li><a href="#">Камчатский край</a></li><li><a href="#">Кемеровская область</a></li><li><a href="#">Кировская область</a></li><li><a href="#">Костромская область</a></li><li><a href="#">Краснодарский край</a></li><li><a href="#">Красноярский край</a></li><li><a href="#">Курганская область</a></li><li><a href="#">Курская область</a></li><li><a href="#">Ленинградская область</a></li><li><a href="#">Липецкая область</a></li><li><a href="#">Магаданская область</a></li><li><a href="#">Москва</a></li><li><a href="#">Московская область</a></li><li><a href="#">Мурманская область</a></li><li><a href="#">Ненецкий автономный округ</a></li><li><a href="#">Нижегородская область</a></li><li><a href="#">Новгородская область</a></li><li><a href="#">Новосибирская область</a></li><li><a href="#">Омская область</a></li><li><a href="#">Оренбургская область</a></li><li><a href="#">Орловская область</a></li><li><a href="#">Пензенская область</a></li><li><a href="#">Пермский край</a></li><li><a href="#">Приморский край</a></li><li><a href="#">Псковская область</a></li><li><a href="#">Республика Адыгея</a></li><li><a href="#">Республика Алтай</a></li><li><a href="#">Республика Башкортостан</a></li><li><a href="#">Республика Бурятия</a></li><li><a href="#">Республика Дагестан</a></li><li><a href="#">Республика Ингушетия</a></li><li><a href="#">Республика Кабардино-Балкария</a></li><li><a href="#">Республика Калмыкия</a></li></ul></div>
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CSS 

              
                a {
  text-decoration: none;
  color: black;
  transition: 0.3s;}
a:hover {color: red;}

ul li {margin-bottom: 5px}

#search_location_result_list {padding: 15px 0;}

#search_location_result_list a {
  display: block;
  padding: 5px 15px;
}
#search_location_result_list a:hover {
	background: red;
  color: #fff;
}
!

JS 

              
                document.addEventListener('DOMContentLoaded', function () {
	// Вешаем обработчик на документ (или любой другой родительский элемент)
	document.body.addEventListener("input", function (event) {
		// Проверяем, является ли целевым элементом наш input
		if (event.target && event.target.id === "search_location_name_list") {
			const searchInput = event.target;
			const list = document.querySelector(".biz_geo_cities_list");
			const resultDiv = document.querySelector("#search_location_result_list");
			
			if (!searchInput || !list || !resultDiv) {
				console.error("Не удалось найти один или несколько элементов: input, список или результат.");
				return;
			}

			const searchTerm = searchInput.value.toLowerCase();

			// Элементы списка
			const listLi = list.querySelectorAll("li");

			// Переменная для хранения найденных элементов
			let resultHtml = "";

			// Перебираем элементы списка
			for (let i = 0; i < listLi.length; i++) {
				const item = listLi[i];
				const itemText = item.textContent.toLowerCase();

				// Если поисковый запрос найден в тексте элемента, добавляем его содержимое (ссылку) в результат
				if (itemText.indexOf(searchTerm) !== -1) {
					const linkElement = item.querySelector('a'); // Ищем элемент <a> внутри <li>
					if (linkElement) {
						resultHtml += linkElement.outerHTML; // Добавляем содержимое <a>
					}
				}

				// Проверяем вложенные списки
				const item_ul = item.querySelector('ul');
				if (item_ul) {
					for (let j = 0; j < item_ul.children.length; j++) {
						const subItem = item_ul.children[j];
						const subItemText = subItem.textContent.toLowerCase();
						const subLinkElement = subItem.querySelector('a'); // Ищем элемент <a> во вложенном <li>

						// Если поисковый запрос найден в тексте вложенного элемента, добавляем его содержимое (ссылку) в результат
						if (subItemText.indexOf(searchTerm) !== -1 && subLinkElement) {
							resultHtml += subLinkElement.outerHTML;
						}
					}
				}
			}

			// Выводим найденные элементы в блок результатов
			resultDiv.innerHTML = resultHtml;
      
      // если поле пустое
      if (searchInput.value== ''){ resultDiv.innerHTML = ''; }
      
		}
	});
});
!
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