var lastUpdate = 0
;

var userToken = null;

function ajaxSetToken(inToken)
{
    userToken = inToken;
}

/*
 * Returns a new XMLHttpRequest object, or false if this browser
 * doesn't support it
 */
function newXMLHttpRequest() {

  var xmlreq = false;

  if (window.XMLHttpRequest) {

    // Create XMLHttpRequest object in non-Microsoft browsers
    xmlreq = new XMLHttpRequest();

  } else if (window.ActiveXObject) {

    // Create XMLHttpRequest via MS ActiveX
    try {
      // Try to create XMLHttpRequest in later versions
      // of Internet Explorer

      xmlreq = new ActiveXObject("Msxml2.XMLHTTP");

    } catch (e1) {

      // Failed to create required ActiveXObject

      try {
        // Try version supported by older versions
        // of Internet Explorer

        xmlreq = new ActiveXObject("Microsoft.XMLHTTP");

      } catch (e2) {

        // Unable to create an XMLHttpRequest with ActiveX
      }
    }
  }

  return xmlreq;
}

/*
 * Returns a function that waits for the specified XMLHttpRequest
 * to complete, then passes its XML response
 * to the given handler function.
 * req - The XMLHttpRequest whose state is changing
 * responseXmlHandler - Function to pass the XML response to
 */
function getReadyStateHandler(req, responseXmlHandler) {

  // Return an anonymous function that listens to the
  // XMLHttpRequest instance
  return function () {

    // If the request's status is "complete"
    if (req.readyState == 4) {

      // Check that a successful server response was received
      if (req.status == 200) {

        // Pass the XML payload of the response to the
        // handler function
        responseXmlHandler(req.responseXML);

      } else {

        // An HTTP problem has occurred
        alert("HTTP error: "+req.status);
      }
    }
  }
}

function updateList(listXML) {

 // Get the root "xmlresponse" element from the document
 var responseElement = listXML.getElementsByTagName("xmlresponse")[0];

 // Check that a more recent response document hasn't been processed
 // already
 var generated = responseElement.getAttribute("generated");
 if (generated > lastUpdate) {
   lastUpdate = generated;

   // Clear the list used to display the cart contents
   var destlistid = responseElement.getAttribute("destlist");
   var destlist = document.getElementById(destlistid);

   destlist.innerHTML = "";

   // Loop over the items in the cart
   var items = responseElement.getElementsByTagName("item");
   for (var I = 0 ; I < items.length ; I++) {

     var item = items[I];

     // Extract the text nodes from the name and quantity elements
     var name = item.getAttribute("name");
     var value = item.getAttribute("value");
     if (value == null || value == "") {
        value = name;
     }

     // Create and add an option item HTML element for this cart item
     var li = document.createElement("option");
     li.value = value;
     li.appendChild(document.createTextNode(name));
     destlist.appendChild(li);
   }
 }
}

function ajaxListRemoval(inListID)
{
    var req = newXMLHttpRequest();

    var listObject = document.getElementById(inListID);
    var selectedObject = listObject.options[listObject.selectedIndex];
    var selectedValue = selectedObject.value;

    var handlerFunction = getReadyStateHandler(req, updateList);
    req.onreadystatechange = handlerFunction;

    req.open("POST", "/spotme/EditTagList.mrk", true);

    req.setRequestHeader("Content-Type",
                       "application/x-www-form-urlencoded");

    // Send form encoded data stating that I want to add the
    // specified item to the cart.
    req.send("generic(action)=remove&generic(destlist)="+inListID+"&generic(item)="+selectedValue);

}

/*
 */
function ajaxListSelection(inSourceList, inDestinationList, inAction) {

  // Obtain an XMLHttpRequest instance
  var req = newXMLHttpRequest();

  // Get the selection from the list
  var srcIndex = inSourceList.selectedIndex
  var srcObject = inSourceList.options[srcIndex];
  var srcObjectID = srcObject.value;

  // Set the handler function to receive callback notifications
  // from the request object
  var handlerFunction = getReadyStateHandler(req, updateList);
  req.onreadystatechange = handlerFunction;

  // Open an HTTP POST connection to the spot list action.
  // Third parameter specifies request is asynchronous.
  req.open("POST", inAction, true);

  // Specify that the body of the request contains form data
  req.setRequestHeader("Content-Type",
                       "application/x-www-form-urlencoded");

  // Send form encoded data stating that I want to add the
  // specified item to the cart.
  req.send("generic(action)=add&generic(destlist)="+inDestinationList+"&generic(item)="+srcObjectID);
}

function ajaxPostKeysAndValues(inAction, inKeys, inValues, inUpdate)
{
  // Obtain an XMLHttpRequest instance
  var req = newXMLHttpRequest();

  // Set the handler function to receive callback notifications
  // from the request object
  var handlerFunction = getReadyStateHandler(req, inUpdate);
  req.onreadystatechange = handlerFunction;

  // Open an HTTP POST connection to the spot list action.
  // Third parameter specifies request is asynchronous.
  req.open("POST", inAction, true);

  // Specify that the body of the request contains form data
  req.setRequestHeader("Content-Type",
                       "application/x-www-form-urlencoded");

  var posting = "";
  for (var i = 0; i < inKeys.length; i++) {
      posting += inKeys[i] + "=" + inValues[i] + "&";
  }

  req.send(posting.replace(/\&$/g, ""));
}

function isArray(obj) {
   if (obj.constructor.toString().indexOf("Array") == -1)
      return false;
   else
      return true;
}


function ajaxPost(inAction, inValue, inUpdate)
{
    var keys = new Array(1);
    keys[0] = "data";
    var values = new Array(1);
    values[0] = inValue;
    ajaxPostMultiple(inAction, keys, values, inUpdate)
}

function ajaxPostMultiple(inAction, inKeys, inValues, inUpdate)
{
  // Obtain an XMLHttpRequest instance
  var req = newXMLHttpRequest();

  // Set the handler function to receive callback notifications
  // from the request object
  var handlerFunction = getReadyStateHandler(req, inUpdate);
  req.onreadystatechange = handlerFunction;

  // Open an HTTP POST connection to the spot list action.
  // Third parameter specifies request is asynchronous.

  req.open("POST", inAction, true);

  // Specify that the body of the request contains form data
  req.setRequestHeader("Content-Type",
                       "application/x-www-form-urlencoded");

  // Send form encoded data stating that I want to add the
  // specified item to the cart.
  var sendString = "";
  if (userToken != null) {
      sendString += "g(userToken)=" + userToken + "&";
  }
  for (var i = 0; i < inKeys.length; i++) {
      sendString += "g(" + inKeys[i] + ")=" + inValues[i] + "&";
  }
  // remove trailing '&'
  sendString = sendString.substring(0, sendString.length - 1);
  req.send(sendString);
}

function showElement(inID) {
    document.getElementById(inID).style.display = "inline";
}

function hideElement(inID) {
    document.getElementById(inID).style.display = "none";
}

function toggleDiv(inDivID)
{
	var theDiv = document.getElementById(inDivID);
	if (theDiv) {
		if (theDiv.style.display == "none") {
			theDiv.style.display = "inline";
		} else {
			theDiv.style.display = "none";
		}
	}
}