JSFiddle - React, Tailwind, and code Playground

HTML

<select name="dropdown" size=1>
    <option value="1">option 1</option>
    <option value="2">option 2</option>
</select>

JavaScript

$('select[name="dropdown"]').change(function(){
  
    if ($(this).val() == "2")
        alert("call the do something function on option 2");
    
});