JSFiddle - React, Tailwind, and code Playground

by st3fan

HTML

<select>
    <option value="0">Select value</option>
</select>

JavaScript

$('select').on('focus', function() {
    var $this = $(this);
    if ($this.children().length == 1) {
        $this.append('<option value="1">1</option><option value="2">2</option>');
    }
});