How to perform cross-site ajax request?

Question

Browsers don\'t allow cross-site AJAX calls (it\'s a security restriction). Is there any possible solution ?

EDIT

I control only the caller website

Answer 1

Your best solution is to use JSONP calls.

 function jsonp(url, params, callback){
  var script = document.createElement("script");
  script.setAttribute("src", url+'?'+params+'&callback='+callback);
  script.setAttribute("type","text/javascript");
  document.body.appendChild(script);
 }

 function doit(data){
  alert(data);
 }

jsonp('http://domain.com', 'foo=bar', 'doit');

In the opposite side, the website you're contacting must be able to return a JSONP formatted response in order for this to work.