//javascript
function getNewFriends() {
    xHRObject.open("GET", "FriendController", true);
    //var tekst = xHRObject.readyState;
    xHRObject.overrideMimeType('text/xml');
    xHRObject.onreadystatechange = getDataXml;
    xHRObject.send(null);
}
function getDataXml() {

    if (xHRObject.readyState == 4) {
        tekst = xHRObject.status;
        if (xHRObject.status == 200) {

            var serverResponse = xHRObject.responseXML;
            var vrienden = serverResponse.getElementsByTagName("person");

            for (var i = 0; i < vrienden.length; i++) {

                var nicknameXML = serverResponse.getElementsByTagName("nickname");
                var statusXML = serverResponse.getElementsByTagName("status");
                var friendsXML = serverResponse.getElementsByTagName("friends");

                var table = document.getElementById("friendsBody");
                var lastRow = table.rows.length;
                var row = table.insertRow(lastRow);
                row.setAttribute("onclick", "openWindow(id);this.blur();return false;");
                row.id = nicknameXML[i].textContent;

                var cellLeft = row.insertCell(0);
                var textNode = document.createTextNode(nicknameXML[i].textContent);
                cellLeft.appendChild(textNode);

                var cellMiddle = row.insertCell(1);
                var textNode = document.createTextNode(statusXML[i].textContent);
                cellMiddle.appendChild(textNode);

                var cellRight = row.insertCell(2);
                var textNode = document.createTextNode(friendsXML[i].textContent);
                cellRight.appendChild(textNode);

                continue;

                table.appendChild(row);
            }
        }
    }
}
//controller

  @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

            //friendsXML = toXML(per);
        response.reset();
        response.setContentType("text/xml");
        response.getWriter().write(showFriends(request, response));
    }

    public String showFriends(HttpServletRequest request, HttpServletResponse response) {
//user van cookie lezen voor email te vinden ==> huidige user
        Person per = (Person) request.getSession().getAttribute("email");
        String email = per.getEmail();
//zijn lijst met vrienden opvragen
        List<Person> friends = facade.getUser(email).getFriends();

        String friendsXML = "";

        friendsXML = toXML(friends);
        return friendsXML;
    }
//xml aanmaken
    public String toXML(List<Person> friends) {
        StringBuffer xmlDoc = new StringBuffer();

        xmlDoc.append("<?xml version=\"1.0\" encoding=\"utf-8\" ?>");
        xmlDoc.append("<persons>\n");
        for (Person per : friends) {
            xmlDoc.append("<person>\n");
            xmlDoc.append("<nickname>\n");
            xmlDoc.append(per.getNickname());
            xmlDoc.append("</nickname>\n");

            xmlDoc.append("<status>\n");
            xmlDoc.append(per.getStatus());
            xmlDoc.append("</status>\n");

            xmlDoc.append("<friends>\n");
            xmlDoc.append("yes");
            xmlDoc.append("</friends>\n");
            xmlDoc.append("</person>\n");
        }
        xmlDoc.append("</persons>\n");
        return xmlDoc.toString();
    }