Zmień zdarzenia
<input type="text" onchange="console.log('You changed the text box!');">
<select name="my-select" id="my-select" onchange="console.log('You changed the select box!');">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
Gorgeous Goldfinch