JSFiddle - React, Tailwind, and code Playground

by envira

HTML

<select id="yourSelectID">
    <option value="01201">test</option>
    <option value="012012">test2</option>
    <option value="012013">test3</option>
    <option value="012014">test4</option>
</select>

JavaScript

window.onload = function () {
    var eSelect = document.getElementById('yourSelectID');

    eSelect.onchange = function () {
        var strUser = eSelect.options[eSelect.selectedIndex].value;
        window.location.replace("http://website.com/main.php?sid=" + strUser);
    }
}