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Interactive AJAX Polling

Example 
<html>
  <head>
    <script>
      function get_votes(int) {
        if (window.XMLHttpRequest) {
            // script for browser version above IE 7 and the other popular browsers (newer browsers)
            xmlhttpreq = new XMLHttpRequest();
        } else {  
            // script for the IE 5 and 6 browsers (older versions)
            xmlhttpreq = new ActiveXObject("Microsoft.XMLHTTP");
        }
        xmlhttpreq.onreadystatechange = function() {
          //check if server response is ready  
          if (this.readyState == 4 && this.status==200) {
            document.getElementById("ajax_poll").innerHTML=this.responseText;
          }
        }
        xmlhttpreq.open("GET","poll_votes.php?res="+int,true);
        xmlhttpreq.send();
      }
    </script>
  </head>
<body>
  <div id="ajax_poll">
    <h3>Is Bitdegree Learn a good learning platform?</h3>
    <form>
      Yes!
      <input type="radio" name="res" value="0" onclick="get_votes(this.value)">
      <br>No!
      <input type="radio" name="res" value="1" onclick="get_votes(this.value)">
    </form>
  </div>
</body>
</html>
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