JSFiddle - React, Tailwind, and code Playground

by Justin

HTML

<select class="component" name="blah">
    <option value="1">1</option>
    <option value="2">2</option>
</select>
<select class="component" name="blah2">
    <option value="3">3</option>
    <option value="4">4</option>
</select>
<select name="combined"></select>

JavaScript

$(function () {
    $('.component').change(function () {
        $('select[name="combined"]').append('<option value="' + $(this).val() + '">' + $(this).val() + '</option>')
    })
})