JSFiddle - React, Tailwind, and code Playground

HTML

<div id='myDiv'>
    <select name="name1">
        <option value="1.1">1.1</option>
        <option value="1.2">1.2</option>
    </select>
    <select name="name2">
        <option value="2.1">2.10</option>
        <option value="2.2">2.2</option>
    </select>
</div>

JavaScript

function changeHandler(el) {
    console.log(el.name + "  " + el.options[el.selectedIndex].value);
    //query to server code
}

document.getElementById("myDiv").onchange = function(e) {
    var ev = e || window.event,
        target = ev.srcElement || ev.target;
    if(target.tagName.toLowerCase()==="select") {
        changeHandler(target);
    }
};