/**
* This page has all the necessary to use AJAX method easily
*
* First of all, the XmlHttpRequestObject Object is used to call server and retrieve result by callback function.
*
* The function XmlHttpRequestCall() is the method which must be used in the client page
* It is used to make a XmlHttpRequestObject and refresh a HTML part in the page
*
* The function xmlHasFirstNodeNamed() is usefull for the callBackFunction, it tests if the Xml tag in parameter exists or if the Xml is not the one expected.
*
* How to use all these methods :
*
* client.html
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*/
/**
* Object XmlHttpRequestObject is used to send Request to server by Javascript.
* call(url,function) is used to call the server and call function(response) to get and display data from server (XML or simple HTML)
* TODO: add an example
*/
function XmlHttpRequestObject()
{
//var r, initialize the attempted request object, if r is not initialized it is global so it wont works with multiple call xml request !!! (3h de recherche grrr!)
var r;
// branch for native XMLHttpRequest object
if(window.XMLHttpRequest) {
try {
r = new XMLHttpRequest();
} catch(e) {
r = false;
}
// branch for IE/Windows ActiveX version
} else if(window.ActiveXObject) {
try {
r = new ActiveXObject("Msxml2.XMLHTTP");
} catch(e) {
try {
r = new ActiveXObject("Microsoft.XMLHTTP");
} catch(e) {
r = false;
}
}
}
if (!r){
return null;
}
this.call = function(serverUrl, callBackFunction, divId)
{
if (!r){
return false;
}
r.open("GET", serverUrl, true);
r.onreadystatechange = function(){
//alert(r.readyState+" && "+r.status );
//if (r.readyState == 4 && r.status == 200)
if (r.readyState == 4 )
{
callBackFunction(r, divId);
}
};
r.send(null);
return true;
};
return this;
}
/**
* Load and set refresh time to call server
*/
function XmlHttpRequestCall( serverUrl, timeOut, callBackMethod, divId){
//--- Chargement initial
var Request = new XmlHttpRequestObject();
Request.call(serverUrl, callBackMethod, divId);// cette call ira qppeler les methods de processor
//--- Rappel de l'object après dépassement du timer
if(timeOut > 0){
setTimeout("XmlHttpRequestCall(\""+serverUrl+"\",\""+timeOut+"\","+callBackMethod+")",timeOut);
}
}
/**
* Check if the XML is the one expected by testing if the first tag is right
*/
function xmlHasFirstNodeNamed(xml,tagName){
if( xml && xml.hasChildNodes() ){
if( xml.documentElement.nodeName == tagName ){
return true;
}
}
return false;
}
/**
* Returns response from server
*/
function getXmlHttpServerResponse(response){
return response.responseText;
}