/**
* Returns an XMLHttp instance to use for asynchronous
* downloading. This method will never throw an exception, but will
* return NULL if the browser does not support XmlHttp for any reason.
* @return {XMLHttpRequest|Null}
*/
function createXmlHttpRequest() {
 try {
   if (typeof ActiveXObject != 'undefined') {
     return new ActiveXObject('Microsoft.XMLHTTP');
   } else if (window["XMLHttpRequest"]) {
     return new XMLHttpRequest();
   }
 } catch (e) {
   changeStatus(e);
 }
 return null;
};

/**
* This functions wraps XMLHttpRequest open/send function.
* It lets you specify a URL and will call the callback if
* it gets a status code of 200.
* @param {String} url The URL to retrieve
* @param {Function} callback The function to call once retrieved.
*/
function downloadUrl(url, callback) {
 var status = -1;
 var request = createXmlHttpRequest();
 if (!request) {
   return false;
 }

 request.onreadystatechange = function() {
   if (request.readyState == 4) {
     try {
       status = request.status;
     } catch (e) {
       // Usually indicates request timed out in FF.
     }
     if (status == 200) {
       callback(request.responseXML, request.status);
       request.onreadystatechange = function() {};
     }
   }
 }
 request.open('GET', url, true);
 try {
   request.send(null);
 } catch (e) {
   changeStatus(e);
 }
};

/**
 * Parses the given XML string and returns the parsed document in a
 * DOM data structure. This function will return an empty DOM node if
 * XML parsing is not supported in this browser.
 * @param {string} str XML string.
 * @return {Element|Document} DOM.
 */
function xmlParse(str) {
  if (typeof ActiveXObject != 'undefined' && typeof GetObject != 'undefined') {
    var doc = new ActiveXObject('Microsoft.XMLDOM');
    doc.loadXML(str);
    return doc;
  }

  if (typeof DOMParser != 'undefined') {
    return (new DOMParser()).parseFromString(str, 'text/xml');
  }

  return createElement('div', null);
}

/**
 * Appends a JavaScript file to the page.
 * @param {string} url
 */
function downloadScript(url) {
  var script = document.createElement('script');
  script.src = url;
  document.body.appendChild(script);
}

/**
 * Initialize the Google Maps and render the XML File
 */
var infowindow;
var map;

function initialize() {
  var myLatlng = new google.maps.LatLng(39.63657641699624, 2.94708251953125);
  var myOptions = {
    zoom: 10,
    center: myLatlng,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  }
  map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
  downloadUrl(path+"/wp-content/plugins/post2googlemaps/post2googlemaps-xml.php?post="+post+"&postmeta="+postmeta, function(data) {
    var markers = data.documentElement.getElementsByTagName("marker");
    for (var i = 0; i < markers.length; i++) {
		cord = markers[i].getAttribute("cord").split(",");
		var latlng = new google.maps.LatLng(parseFloat(cord[0]),
		                                    parseFloat(cord[1]));
		var marker = createMarker(markers[i].getAttribute("title"), latlng);
     }
   });
}

/**
 * Create marker with InfoWindow
 * @param {string} name
 * @param {string} latlng
 */
function createMarker(name, latlng) {
  var marker = new google.maps.Marker({position: latlng, map: map});
  google.maps.event.addListener(marker, "click", function() {
    if (infowindow) infowindow.close();
    infowindow = new google.maps.InfoWindow({content: name});
    infowindow.open(map, marker);
  });
  return marker;
}

window.onload=initialize;