AJAX POST request on IE fails with error "No Transport"? - ajax

Question

I'm trying to make an AJAX request to a public service
Here's the code:
$.ajax({
url : "http://api.geonames.org/citiesJSON",
type : 'POST',
cache : false,
dataType : 'json',
data : {
username: "demo",
north:10,
south: 10,
east:10,
west:10}
}).done(function(data) {
alert("Success: " + JSON.stringify(data));
}).fail(function(a, b, c, d) {
alert("Failure: "
+ JSON.stringify(a) + " "
+ JSON.stringify(b) + " "
+ JSON.stringify(c) + " "
+ JSON.stringify(d) );
});
You may try it in this link: http://jsfiddle.net/hDXq3/
The response is retrieved successfully on Chrome & Firefox, and the output is as follows:
But for IE, the fails alerting:
Failure: {"readyState":0,"status":0,"statusText":"No Transport"} "error" "No Transport" undefined
Why it's not working on IE ? and how to fix this ?

Answer 1

Here's the solution for those who are interested:
if (!jQuery.support.cors && window.XDomainRequest) {
var httpRegEx = /^https?:\/\//i;
var getOrPostRegEx = /^get|post$/i;
var sameSchemeRegEx = new RegExp('^'+location.protocol, 'i');
var xmlRegEx = /\/xml/i;
// ajaxTransport exists in jQuery 1.5+
jQuery.ajaxTransport('text html xml json', function(options, userOptions, jqXHR){
// XDomainRequests must be: asynchronous, GET or POST methods, HTTP or HTTPS protocol, and same scheme as calling page
if (options.crossDomain && options.async && getOrPostRegEx.test(options.type) && httpRegEx.test(userOptions.url) && sameSchemeRegEx.test(userOptions.url)) {
var xdr = null;
var userType = (userOptions.dataType||'').toLowerCase();
return {
send: function(headers, complete){
xdr = new XDomainRequest();
if (/^\d+$/.test(userOptions.timeout)) {
xdr.timeout = userOptions.timeout;
}
xdr.ontimeout = function(){
complete(500, 'timeout');
};
xdr.onload = function(){
var allResponseHeaders = 'Content-Length: ' + xdr.responseText.length + '\r\nContent-Type: ' + xdr.contentType;
var status = {
code: 200,
message: 'success'
};
var responses = {
text: xdr.responseText
};
try {
if (userType === 'json') {
try {
responses.json = JSON.parse(xdr.responseText);
} catch(e) {
status.code = 500;
status.message = 'parseerror';
//throw 'Invalid JSON: ' + xdr.responseText;
}
} else if ((userType === 'xml') || ((userType !== 'text') && xmlRegEx.test(xdr.contentType))) {
var doc = new ActiveXObject('Microsoft.XMLDOM');
doc.async = false;
try {
doc.loadXML(xdr.responseText);
} catch(e) {
doc = undefined;
}
if (!doc || !doc.documentElement || doc.getElementsByTagName('parsererror').length) {
status.code = 500;
status.message = 'parseerror';
throw 'Invalid XML: ' + xdr.responseText;
}
responses.xml = doc;
}
} catch(parseMessage) {
throw parseMessage;
} finally {
complete(status.code, status.message, responses, allResponseHeaders);
}
};
xdr.onerror = function(){
complete(500, 'error', {
text: xdr.responseText
});
};
xdr.open(options.type, options.url);
//xdr.send(userOptions.data);
xdr.send();
},
abort: function(){
if (xdr) {
xdr.abort();
}
}
};
}
});
};
jQuery.support.cors = true;
$.ajax({
url : "http://api.geonames.org/citiesJSON",
crossDomain: true,
type : 'POST',
cache : false,
dataType : 'json',
data : {
username: "demo",
north:10,
south: 10,
east:10,
west:10}
}).done(function(data) {
alert("Success: " + JSON.stringify(data));
}).fail(function(a, b, c, d) {
alert("Failure: "
+ JSON.stringify(a) + " "
+ JSON.stringify(b) + " "
+ JSON.stringify(c) + " "
+ JSON.stringify(d) );
});
You may try it in this link: http://jsfiddle.net/bjW8t/4/

Answer 2

Just include the jQuery ajaxTransport extension that uses XDomainRequest for IE8+.