JSFiddle - React, Tailwind, and code Playground

by ErikE

HTML

<select id="select" onchange="run()">
     <option value="0" id="0">Select</option>
     <option value="1" id="titel 1">Titel 1</option>
     <option value="2" id="titel 2">Titel 2</option>
     <option value="3" id="titel 3">Titel 3</option>     
</select><br><br>

ID <input type="text" id="id">
Titel <input type="text" id="titel">

JavaScript

function run() {
    document.getElementById("id").value = document.getElementById("select").value;
    document.getElementById("titel").value = document.getElementById("select").value;
}

function run() {
    var select = document.getElementById("select"),
       option = select.options[select.selectedIndex];
    document.getElementById("id").value = option.id;
    document.getElementById("titel").value = option.innerHTML;
}