JSFiddle - React, Tailwind, and code Playground

HTML

<select name="sites" onchange="openAnotherWin(this)">
        <option value="">Select one site...</option>
        <option value="http://www.google.com">Google</option>
        <option value="http://www.microsoft.com">Microsoft</option>
    </select>

JavaScript

function openAnotherWin(combo) {
        var v = combo.value;
        window.open(v);
    }