JSFiddle - React, Tailwind, and code Playground

JavaScript

$(function(){
		var id_country = $(".country").val();
		$.ajax({
				type: "POST",
				url: "select2",
				data: {id_city: id_city},
				success: function(data){
					$(".city").html(data);
				}
			)};	
		
		$(".country").change(function(){
			var id_country = $(".country").val();
			if(id_country == 0){
				
			}
			$.ajax({
				type: "POST",
				url: "select2",
				data: {id_city: id_city},
				success: function(data){
					$(".city").html(data);
				}
			)};	
		};	
	)};