//------------------------------------------------------------------
// Auteur : Ludovic Martin <ludovic@dreamclic.com> / www.dreamclic.com
// 
// Version             : 2.0
// Date de création    : 26/06/2008
//
// Description         : Fonctions d'aide au développement AJAX
//
//------------------------------------------------------------------

//------------------------------------------------------------------
//Envoi d'une requête GET asynchrone
function httpGet(url,successEventHandler,errorEventHandler){
	return doHTTPRequest(url,null,"GET",false,false,successEventHandler,errorEventHandler);
}
//------------------------------------------------------------------
//Envoi d'une requête POST asynchrone
function httpPost(url,message,successEventHandler,errorEventHandler){
	return doHTTPRequest(url,message,"POST",false,false,successEventHandler,errorEventHandler);
}
//------------------------------------------------------------------
//Envoi d'une requête GET synchrone
function httpGetSync(url){
	return doHTTPRequest(url,null,"GET",false,true,null,null);
}
//------------------------------------------------------------------
//Envoi d'une requête POST synchrone
function httpPostSync(url,message){
	return doHTTPRequest(url,message,"POST",false,true,null,null);
}
//------------------------------------------------------------------
//Envoi d'une requête GET asynchrone
function httpGetXML(url,successEventHandler,errorEventHandler){
	return doHTTPRequest(url,null,"GET",true,false,successEventHandler,errorEventHandler);
}
//------------------------------------------------------------------
//Envoi d'une requête POST asynchrone
function httpPostXML(url,message,successEventHandler,errorEventHandler){
	return doHTTPRequest(url,message,"POST",true,false,successEventHandler,errorEventHandler);
}
//------------------------------------------------------------------
//Envoi d'une requête GET synchrone
function httpGetXMLSync(url){
	return doHTTPRequest(url,null,"GET",true,true,null,null);
}
//------------------------------------------------------------------
//Envoi d'une requête POST synchrone
function httpPostXMLSync(url,message){
	return doHTTPRequest(url,message,"POST",true,true,null,null);
}
//------------------------------------------------------------------
//Termine une requête
function httpAbort(httpObject){
	if(httpObject!=null)
		httpObject.abort();
}
//------------------------------------------------------------------
//Lance une requête HTTP (ne devrait pas être appelé directement)
function doHTTPRequest(url,message,method,useXML,synchrone,successEventHandler,errorEventHandler){
	var httpObject=getHttpObject();
	if(httpObject!=null){
		if(!synchrone){
			httpObject.onreadystatechange=function(){
				handleHTTPEvent(httpObject,useXML,successEventHandler,errorEventHandler);
			};
		}
		httpObject.open(method,url,!synchrone);
		if(method="POST")
			httpObject.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); 
		httpObject.send(message);
		if(synchrone){
			if(httpObject.readyState==4&&httpObject.status==200)
				return useXML?httpObject.responseXML:httpObject.responseText;
			else
				return null;
		}
		return httpObject;
	}
	return null;
}
//------------------------------------------------------------------
//Gestion des événements de retour (ne devrait pas être appelé directement)
function handleHTTPEvent(httpObject,useXML,successEventHandler,errorEventHandler){
	if(httpObject.readyState==4)
		if(httpObject.status==200){
			if(successEventHandler!=null)
				successEventHandler(useXML?httpObject.responseXML:httpObject.responseText);
		}else{
			if(errorEventHandler!=null)
				errorEventHandler(httpObject.status);
		}
}
//------------------------------------------------------------------