Save in database, radio input created with javascript?

Good in a form created a button that creates radio input with javascript, the question is that I would like to save those radio inputs (alternatives) in my database.

<form action="pregunta-quest.php" method="post">
<input type="text" id="txopcion" placeholder="Escribe Opción">
  <button type="button" onclick="adiradio()">agregar</button><br>   
  <span id="adicionarR"></span>
</form>

This is the script

<script>
function adiradio() {
            var text = document.getElementById("txopcion").value;//obtiene el text para la opcion
            if(text!=''){ //que no se pueda poner opciones vacias
            var node=document.createElement("P");//etiqueta p
            var x = document.createElement("INPUT");//crea un input
            var textnode = document.createTextNode(text);//asigna el text 
            x.setAttribute("type", "radio");//hace que type del input sea radio
            x.setAttribute("name","alternati");
            x.setAttribute("value",text);
            node.appendChild(x);
            node.appendChild(textnode);
            document.getElementById("adicionarR").appendChild(node);
            }
        }
</script>