JSFiddle - React, Tailwind, and code Playground

HTML

Select server <br>
  <input type="radio" name="server" value="1">Production<br>
  <input type="radio" name="server" value="2">Test<br>
  <input type="radio" name="server" value="3">Localhost<br>
  <input type="radio" name="server" value="4"><input type="text" id="other" name="server" />
  <input type="submit" id="saveRadio" value="Submit" onclick="submit();" >

JavaScript

function submit(){
var curRadio = document.querySelector('input[name="server"]:checked').value;
    var serverValue;
    if(curRadio==4)
    {
        serverValue=document.getElementById("other").value;
    }
    else
    {
        serverValue=curRadio;
    }
    alert(serverValue);
}