JSFiddle - React, Tailwind, and code Playground

by fkling

HTML

<select id="selectID">
    <option>A</option>
    <option>B</option>
    <option>C</option>
    <option>D</option>
    <option>E</option>
    <option>F</option>
</select>

JavaScript

$('#selectID').change(function(){
    $(this).attr('size', $(this).children().length);
});