var URL = window.location.href;
var index = URL.indexOf("/",8);
if ( index != -1 ) URL = URL.substring(0,index).concat("/location_vacances/xhr.php");
else URL = URL.concat("/location_vacances/xhr.php");

var XHR_IDS = ['Msxml2.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.4.0'];

function getXHR(){
  var xhr = null;
	// FF, safari, opera
  try{
			xhr = new XMLHttpRequest();
	}catch(e){}
	// IE
  if( !xhr ){
    for( var i = 0; i < 3; i++ ){
      var id = XHR_IDS[i];
      try{
      		xhr = new ActiveXObject(id);
      }catch(e){}
      if( xhr ){
          XHR_IDS = [id];// so faster next time
          break;
      }
    }
  }
  if( !xhr ){
  	alert("XMLHTTP not available");
  }
	return xhr;
}

function sendRequest(params,callback){
	var xhr = getXHR();
	if( !xhr ) return;
	xhr.open("POST",URL,true);
	xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	xhr.onreadystatechange = function(){
		if( xhr.readyState == 4 ){
			if( xhr.status == 200 ){
				var html = xhr.responseText;
				callback(html);
			}
			else alert("xhr error");
		}
	}
	params = params.concat("&lang=fr");
	xhr.send(params);
}


function onChangePays(){
	document.getElementById("selectRegion").innerHTML = "";
	document.getElementById("selectDepartement").innerHTML = "";
	document.getElementById("selectCommune").innerHTML = "";
	
	if( document.formdepot.destination.value == "" ) return;
	
	document.getElementById("errPays").style.display = "none";
	
	loading(document.getElementById("selectRegion"));
	var params = "&action=getregions&destination=".concat(document.formdepot.destination.value);
	sendRequest(params,onRegionsLoaded);
}

function onChangeRegion(){
	document.getElementById("selectDepartement").innerHTML = "";
	document.getElementById("selectCommune").innerHTML = "";
	
	if( document.formdepot.region.value == "" ) return;
	
	document.getElementById("errRegion").style.display = "none";
	
	loading(document.getElementById("selectDepartement"));
	var params = "&action=getdepartements&destination=".concat(document.formdepot.destination.value,"&region=",document.formdepot.region.value);
	sendRequest(params,onDepartementsLoaded);
}

function onChangeDepartement(){
	document.getElementById("selectCommune").innerHTML = "";
	
	if( document.formdepot.departement.value == "" ) return;
	
	document.getElementById("errDept").style.display = "none";
	
	loading(document.getElementById("selectCommune"));
	var params = "&action=getcommunes&destination=".concat(document.formdepot.destination.value,"&region=",document.formdepot.region.value,"&departement=",document.formdepot.departement.value);
	sendRequest(params,onCommunesLoaded);
}

function onChangeVille(){
	if( document.formdepot.ville.value == "" ) return;
	document.getElementById("errComm").style.display = "none";
}

function onRegionsLoaded(html){
	var node = document.getElementById("selectRegion");
	node.className = "";
	node.innerHTML = html;
	document.formdepot.region.focus();
}

function onCommunesLoaded(html){
	var node = document.getElementById("selectCommune");
	node.className = "";
	node.innerHTML = html;
	document.formdepot.ville.focus();
}

function onDepartementsLoaded(html){
	var node = document.getElementById("selectDepartement");
	node.className = "";
	node.innerHTML = html;
	document.formdepot.departement.focus();
}