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/*--------------------------------------------------------------------------------
AJAX Queue
----------------------------------------------------------------------------------*/
var ajaxQueue = new Array;
var ajaxServiceRunning = false;
var httpAjax = false;
/*--------------------------------------------------------------------------------
AjaxService
This is the only interface to the AJAX wrapper. This makes the ajax service
browser agnostic and provides a single interface for all of the services.
Each service uses a different url and a different parameter layout.
----------------------------------------------------------------------------------*/
function AjaxService(servicename, serviceparam) {
ajaxQueue.push(servicename);
ajaxQueue.push(serviceparam);
if(!ajaxServiceRunning) {
ajaxServiceRunning = true;
var aParam = ajaxQueue.pop();
var aService = ajaxQueue.pop();
ajaxServiceExec(aService, aParam);
}
}
/*--------------------------------------------------------------------------------
AjaxService
This is the only interface to the AJAX wrapper. This makes the ajax service
browser agnostic and provides a single interface for all of the services.
Each service uses a different url and a different parameter layout.
----------------------------------------------------------------------------------*/
function ajaxServiceExec(servicename, serviceparam) {
// Parameters are set, initiate AJAX engine
if (window.XMLHttpRequest) {
httpAjax = new XMLHttpRequest();
if (httpAjax.overrideMimeType) {
httpAjax.overrideMimeType('text/xml');
}
} else if(window.ActiveXObject) {
try {
httpAjax = new ActiveXObject("Msxml2.XMLHTTP");
} catch(e) {
try {
httpAjax = new ActiveXObject("Microsoft.XMLHTTP");
} catch(e) {
alert("CouldnŽt build an AJAX instance.");
return false;
}
}
}
// Send request to Server and initiate callback.
try {
httpAjax.onreadystatechange = getPage;
httpAjax.open('POST', servicename, true);
httpAjax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;");
httpAjax.send(serviceparam);
} catch(e) {
//alert("onreadystatechange didnŽt go well!");
return false;
}
return true;
}
/*--------------------------------------------------------------------------------
getPage
This is the AJAX callback function. It detects the invoking service and handles
the reply from each service accordingly.
----------------------------------------------------------------------------------*/
function getPage() {
if(httpAjax.readyState == 4) {
str = httpAjax.responseText;
if(ajaxQueue.length>0) {
var Aparam = ajaxQueue.pop();
var Aservice = ajaxQueue.pop();
ajaxServiceExec(Aservice, Aparam);
} else {
ajaxServiceRunning=false;
}
return true;
} else {
// If any other ready state than prepared, do nothing!
}
}
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