JSFiddle - React, Tailwind, and code Playground

HTML

<select id="dropdown" onchange="showSelected()">
    <option value="">Choose value</option>
    <option value="1#A">First</option>
    <option value="2#B">Second</option>
</select>
<div id="selectedField"></div>

JavaScript

function showSelected()
{
    var selected = $('#dropdown :selected').val();
    if (selected != ""){
        var splited = selected.split("#");
        var value1 = splited[0];
        var value2 = splited[1];
        $("#selectedField").html("Val1: " + value1 + "<br/> Val2: " + value2);
    } else {        
        $("#selectedField").html("");
    }
}