JSFiddle - React, Tailwind, and code Playground

HTML

<select>
    <option>Option 1</option>
    <option>Option 2</option>
</select>

JavaScript

$(document).ready(function() {
    open($('select'));
});

function open(elem) {
    if (document.createEvent) {
        var e = document.createEvent("MouseEvents");
        e.initMouseEvent("mousedown", true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
        elem[0].dispatchEvent(e);
    } else if (element.fireEvent) {
        elem[0].fireEvent("onmousedown");
    }
}