<?
//
// FAPWeb Simple Demoparty System
// Common AJAX Javascript code module
// (C) Copyright 2012-2013 Tecnic Software productions (TNSP)
//


function stCommonAJAX($backend, $failover, $script = FALSE)
{
if ($script)
  echo "<script type=\"text/javascript\">\n";

?>
function closeMessageBox(callback, cb_data)
{
  var nitem = document.getElementById("messageBox");
  if (nitem && nitem.style.display != "none")
  {
    nitem.style.display = "none";
  
    if (callback && typeof(callback) === "function")
      callback(cb_data);
  }
}


function jsMessageBox(msg)
{
  var nitem = document.getElementById("messageBox");
  if (nitem)
  {
    nitem.innerHTML = "<div class='messageBoxInner'>"+ msg +
      "<div class='messageBoxControls'>"+
      "<input id='msgBoxConfirmClose' type='button' value=' OK '>"+
      "</div></div>";

    document.getElementById("msgBoxConfirmClose").onclick = function () { closeMessageBox(0, 0); }

    nitem.style.display = "block";
  }
}


function jsConfirmBox(msg, cb_ok, cb_cancel, cb_data)
{
  var nitem = document.getElementById("messageBox");
  if (nitem)
  {
    nitem.innerHTML = "<div class='messageBoxInner'><h1>Confirmation</h1><p>"+ msg +"</p>"+
      "<div class='messageBoxControls'>"+
      "<input id='msgBoxConfirmCancel' type='button' value=' Cancel '>"+
      "<input id='msgBoxConfirmOK' type='button' value=' OK '>"+
      "</div></div>";

    document.getElementById("msgBoxConfirmCancel").onclick = function () { closeMessageBox(cb_cancel, cb_data); }
    document.getElementById("msgBoxConfirmOK").onclick = function () { closeMessageBox(cb_ok, cb_data); }
    
    nitem.style.display = "block";
  }
}


function statusMsg(msg)
{
  var nitem = document.getElementById("nstatus");
  if (nitem) nstatus.innerHTML = msg;
}


function strtrim(str)
{
  if (!str || str == null)
    return "";
  return str.replace(/^\s+|\s+$/g,'')
}


function strencode(str)
{
  return encodeURIComponent(str);
}


function jsCreateXMLRequest()
{
  var req;
  if (window.XMLHttpRequest)
  {
    // Modern browsers
    req = new XMLHttpRequest();
  }
  else
  {
    // Old IE versions
    req = new ActiveXObject("Microsoft.XMLHTTP");
  }
  return req;
}


function jsSendPOSTRequest(params, success, failure)
{
<?
  if (($csrfID = stGetSessionItem("csrfID", FALSE)) !== FALSE)
    echo "  params += \"&csrfID=".$csrfID."\";\n";
?>
  var req = jsCreateXMLRequest();
  req.open("POST", "<? echo $backend ?>", true);
  req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  req.setRequestHeader("Content-length", params.length);
  req.setRequestHeader("Connection", "close");

  req.onreadystatechange = function()
  {
    if (req.readyState == 4)
    {
      if (req.status == 404)
      {
        window.location = "<? echo $failover ?>";
      }
      else
      if (req.status == 902)
      {
        statusMsg(req.statusText);
        jsMessageBox(req.responseText);
      }
      else
      if (req.status == 200)
      {
        if (success)
        {
          success(req.responseText);
        }
        statusMsg(req.statusText);
      }
      else
      {
        if (failure)
        {
          failure(req.status, req.statusText, req.responseText);
        }
        else
        {
          statusMsg("["+req.status+" - "+req.statusText+"] "+ req.responseText);
        }
      }
    }
  }
  req.send(params);
}


//
// Function for creating AJAX POST request arguments list based
// on fields and giving them specified types. Also basic check
// for validity can be performed (e.g. field empty or not)
//
var lastPostArgs = Object();
function jsMakePostArgs(fields, fprefix, fsuffix)
{
  var res = [];
  lastPostArgs = Object();

  for (var id in fields)
  {
    var elname = fprefix + id + fsuffix;
    var elem = document.getElementById(elname);
    if (!elem)
    {
      jsMessageBox("No such DOM element '"+ elname +"'.");
      return "";
    }

    switch (fields[id])
    {
      case 1:
        var vstr = strtrim(elem.value);
        res.push(id+"="+strencode(vstr));
        lastPostArgs[id] = vstr;
        break;

      case 2:
        var vint = parseInt(strtrim(elem.value));
        res.push(id+"="+vint);
        lastPostArgs[id] = vint;
        break;

      case 3:
        res.push(id+"="+(elem.checked ? "1" : "0"));
        lastPostArgs[id] = elem.checked;
        break;

      default:
        jsMessageBox("Unsupported field type in "+ elname);
        return "";
    }
  }
  return res.join("&");
}
<?
if ($script)
  echo "</script>\n";
}
?>