JSFiddle - React, Tailwind, and code Playground

by iii l

HTML

<select class="sel">
    <option value="0">---</option>
    <option value="1">первая</option>
    <option value="2">вторая</option>
</select>
<select class="sel2">
    <option value="0">---</option>
    <option value="1">первая</option>
    <option value="2">вторая</option>
</select>

JavaScript

var sel2 = '<select class="sel2"><option value="0">---</option><option value="1">первая</option><option value="2">вторая</option></select>'

$('.sel').change(function(){
    $(sel2).appendTo('body');
    $('.sel2').val($(this).val());
})
$('.sel2').change(function(){
    alert($(this).val())
});