JSFiddle - React, Tailwind, and code Playground

HTML

<select id="sample">
    <option value="1">Value1</option>    
    <option value="2">Value2</option>
    <option value="3">Value3</option>
</select>
<div id="fillValue">
    
    
</div>

JavaScript

$( "#sample" ).change(function() {
   var selValue = $(this).val();
    
    //Sample implementation how it works.
    //var data = "<select ><option value='11'>Value11</option></select>";
    //$("#fillValue").html(data);
    
   $.ajax({
		url : 'ur_servlet_url' + selValue,
		type : "POST",
		async : false,
		success : function(data) {
            //Sample data
            var data = "<select id='child'><option value='11'>Value11</option></select>"
			$("#fillValue").val(data);
		}
	});
});