jQuery Ajax on Different Port

My php file located at port 80 (default port) while my ajax call are on port 8080.

My index.html on port 8080

$(document).ready(function(){
$.get("userCheck.php", 
        {"username" : "lazy", "favcolor" : "FFFFFF" },          
        function(data){ alert("Data Loaded: " + data);
});

My PHP

$user = $_GET["username"];
if($user == "lazy")
    echo "SUCESS";
else
    echo "FAIL";

I have googled abit, JSONP came out mostly. Any idea how to convert it to JSONP?

Any way to make it work?

Answer

Implementing a JSONP service is really simple, you need only a callback GET parameter and at the end, print a string containing the equivalent to a function call with the JSON data as the argument:

$callback = $_GET["callback"];
$user = $_GET["username"];

if($user == "lazy") {
  $response = array("message" => "SUCESS");
} else {
  $response = array("message" => "FAIL");
}

echo $callback . "(". json_encode($response) . ");";

Then you can use it with jQuery $.getJSON:

$.getJSON("jsonpTest.php?callback=?", { username: "lazy"}, function(json){
  alert("JSON Data: " + json.message); // SUCCESS
});