RequestBatch = function() {
this.initialize.apply(this, arguments);
};
// for unique id
var counter = 0;
// how many requests are still pending?
var pendingRequests = 0;
function DirectAccessErrorHandler(msg,ex){
//alert(msg);
}
// the core object to request batches
RequestBatch.prototype = {
initialize: function() {
this.UniqueId = counter++;
this.Requests = new Array()
},
AddToRequest: function(requestThis) {
this.Requests[this.Requests.length] = requestThis;
},
BeginRequest: function(serverUrl, callback) {
pendingRequests++;
var jsonString = JSON.stringify(this);
var form = generateForm(this.UniqueId, serverUrl, jsonString);
new iframe(form, {onComplete: function(request) {processResponse(callback, request);} }, this.UniqueId);
// in case they reuse the requestbatch
this.UniqueId = counter++;
}
};
function generateForm(formId, serverUrl, inputVal) {
// create the form
var form = document.createElement("form");
form.name = "f" + formId;
form.id = "f" + formId;
form.action = serverUrl;
// create the input element on the form
var inputElem = document.createElement("input");
inputElem.name = "jsonRequest";
inputElem.type = "hidden";
inputElem.value = inputVal;
form.appendChild(inputElem);
// Firefox has a behavior on refresh that displays a popup confirming that is it reloading a form.
// We work around this by attempting to perform a get action if the size is below a threshold, else
// we will run as a post
form.method = "post";
if(navigator.userAgent.toLowerCase().indexOf('firefox') != -1) {
var separator = serverUrl.indexOf('?') == -1 ? "?" : "&";
var fullRequestURL = serverUrl + separator + "jsonRequest="+ escape(inputVal);
if (fullRequestURL.length < 15000) {
// we plan to perform a get, so we need to parse the sid out of the url and place it
// inside the form
var sidPos = serverUrl.indexOf('sid=');
if (sidPos != -1) {
var endPos = serverUrl.indexOf('&', sidPos);
var sid = serverUrl.substring(sidPos + 'sid='.length, endPos == -1 ? serverUrl.length : endPos);
var sidInputElem = document.createElement("input");
sidInputElem.name = "sid";
sidInputElem.type = "hidden";
sidInputElem.value = sid;
form.appendChild(sidInputElem);
// remove the sid from the url
form.action = serverUrl.substring(0, sidPos-1);
}
form.method = "get";
}
}
// append the form to the document body
// users must be cautious of when they call this due to a bug in IE
// see http://support.microsoft.com/kb/927917 for details
document.body.appendChild(form);
return form;
}
function processResponse(callback, request)
{
pendingRequests--;
try {
var jsonResponse = unescape(request.responseText);
var responseObject = JSON.parse(jsonResponse);
try {
callback(responseObject.ResponseBatch);
} catch (e) {
DirectAccessErrorHandler("exception during client callback", e);
}
} catch (e) {
DirectAccessErrorHandler("exception during processResponse", e);
}
}
function getPendingRequestCount()
{
return pendingRequests;
}