IE not reading GET success after POST - ajax

Question

I cannot seem to find out why IE does not read my success on get after the post. I have tried cache: false, with no luck. This works in all other browsers, just not IE.
$.ajaxSetup({ cache: false });
num = $('#num').val();
phone = $('#phone').val();
$.post("post.php?"+$("#MYFORM").serialize(), {
}, function(response){
if(response==1 && codeVal == 1 && telVal == 1)
{
$("#after_submit").html('');
$("#Send").after('<label class="success" id="after_submit">Η αποστολή πραγματοποιήθηκε</label>');
change_captcha();
clear_form();
$.ajax({
type:'get',
cache: false,
url: "http://web.somesite/submit_code.php",
dataType: 'html',
data:{ user: "one", pass: "mtwo", source: "WEB", receipt: num, msisdn: phone},
success: function(data) {
var qsFull = "http://web.somesite.gr/submit_code.php?" + data;
var qs = URI(qsFull).query(true);
TINY.box.show({html:qs.message,animate:false,boxid:'error',top:5});
}
});
}
else
{
$("#after_submit").html('');
$("#Send").after('<label class="error" id="after_submit">Error! in CAPTCHA .</label>');
}
});
OK, I tried adding an error after the success and I see that I get my pop up as I should be, but the value of qs.message is 0. Why would I get error and not success, when it is successful in other browsers.

Answer 1

I found the answer, It has to do with IE not being flexible with cross domains and such, so I added a XDomainRequest like so
if (jQuery.browser.msie && window.XDomainRequest) {
var xdr = new XDomainRequest();
var my_request_data = { user: "M1web", pass: "m!", source: "WEB", receipt: num, msisdn: phone};
my_request_data = $.param(my_request_data);
if (xdr) {
xdr.onerror = function () {
alert('xdr onerror');
};
xdr.ontimeout = function () {
alert('xdr ontimeout');
};
xdr.onprogress = function () {
alert("XDR onprogress");
alert("Got: " + xdr.responseText);
};
xdr.onload = function() {
//alert('onload ' + xdr.responseText);
var qsFull = "http://web.web.gr/submit_code.php?" + xdr.responseText;
var qs = URI(qsFull).query(true);
TINY.box.show({html:qs.message,animate:false,boxid:'error',top:5});
callback(xdr.responseText);
};
xdr.timeout = 5000;
xdr.open("get", "http://web.web.gr/submit_code.php?" + my_request_data);
xdr.send();
} else {
}
}

Answer 2

I unfortunately had to do a crash course in legacy IE behavior, and this post was very helpful. Here are some other links to help those having to deal with these issues:
Microsoft's Documentation of their XDomainRequest object
An internal blog post covering some of XDomainRequest's idiosyncrasies
Here's a function I use as a fallback where necessary:
// This is necessary due to IE<10 having no support for CORS.
function fallbackXDR(callObj) {
if (window.XDomainRequest) {
var xdrObj = new XDomainRequest();
xdrObj.timeout = callObj.timeout;
xdrObj.onload = function() {
handleSuccess(xdrObj.responseText);
};
xdrObj.onerror = function() {
handleError(xdrObj);
};
xdrObj.ontimeout = function() {
callObj.xdrAttempts = callObj.xdrAttempts++ || 1;
if (callObj.xdrAttempts < callObj.maxAttempts) {
fallbackXDR(callObj);
}
};
xdrObj.onprogress = function() {
// Unfortunately this has to be included or it will not work in some cases.
};
// Use something other than $.param() to format the url if not using jQuery.
var callStr = callObj ? '?'+$.param(callObj.urlVars) : '';
xdrObj.open("get", callObj.url+callStr);
xdrObj.send();
} else {
handleError("No XDomainRequest available.", callObj);
}
}//fallbackXDR()