JSFiddle - React, Tailwind, and code Playground

HTML

<select id="list" onchange="showDate();" >
    <option value="0">Seleccione</option>
    <option value="1">Opcion 1</option>
</select>

JavaScript

function showDate()
    {
        var xmlhttp;
        var ex=document.getElementById("list");
        //var id=ex[ex.selectedIndex].id;
        var id = document.getElementById("list").value;
        if (window.XMLHttpRequest)
        {   
            // code for IE7+, Firefox, Chrome, Opera, Safari
            xmlhttp=new XMLHttpRequest();
        }
        else
        {
            // code for IE6, IE5
            xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
        xmlhttp.onreadystatechange=function()
        {
            if (xmlhttp.readyState==4 && xmlhttp.status==200)
            {
                document.getElementById("dt").innerHTML=xmlhttp.responseText;

            }
        }
        xmlhttp.open("GET","schdl2.php?f="+id,true);
        xmlhttp.send();
        //loadDetails();
    }