How to pass value from select to action?

Question

JavaScript

I take the data from the select, but I can't insert it into the action of the form!

<form method="post" id="sys" action="link.php">
  <p><select id="selec" name="sys" onchange="change()">
  <option value=''>Choose</option>
    <option value="1" >1</option>
    <option value="2" >2</option>
    </select></p>
</form>

var select, value;

function change() {
    select = document.getElementById("selec"); 
    value = select.options[select.selectedIndex].value; 
    document.sys.action = "/AAA";
}

Answer 1

https://jsfiddle.net/d7006ykn/1/

Answer 2

<script>
window.onload = function(){
  document.all.selec.onchange = function(){
  document.all.sys.setAttribute("action",this.value);
  }
}
</script>
<form method="post" id="sys" action="link.php">
  <p><select id="selec" >
  <option value=''>Choose</option>
    <option value="1" >1</option>
    <option value="2" >2</option>
    </select></p>
</form>