JSFiddle - React, Tailwind, and code Playground

by koodo218

HTML

<select class="takieSame">
  <option>Apple</option>
  <option>Orange</option>
  <option>Pineapple</option>
  <option>Banana</option>
</select>

<select class="takieSame">
  <option>Apple</option>
  <option>Orange</option>
  <option>Pineapple</option>
  <option>Banana</option>
</select>

JavaScript

var takieSame = document.getElementsByClassName('takieSame');
for(i=0;i<takieSame.length;i++){
	takieSame[i].addEventListener('change', zaznaczone);
}

function zaznaczone(){
  for(i=0;i<takieSame.length;i++){
    takieSame[i].selectedIndex = this.selectedIndex;
  }
}