JSFiddle - React, Tailwind, and code Playground

by tymeJV

HTML

<select id="elem">
        <option value="3">value 1</option>
        <option value="6">value 2</option>
        <option value="18">value 3</option>
        <option>value 4</option>
    </select>

JavaScript

var select = document.getElementById("elem");

for (var i = 0; i < select.options.length; i++) {
    if (!select.options[i].hasAttribute('value')) {
        select.options[i].selected = true;
    }
}