JSFiddle - React, Tailwind, and code Playground

HTML

<select>
    <option value="1">One</option>
    <option value="2">Two</option>
</select>

<button class="button">Click</button>

JavaScript

$('.button').click(function(){
	var valueSet = false;
  
  $('select').on('change', function() {
    valueSet = true;
	})
  
  alert(valueSet);
})