Getting setting cookies on different domains, with javascript or other

Question

Haven\'t been able to find anything particular to this situation online so here i go... I need to set/get the cookies stored at \"first.com\" while browsing \"second.com\",

Answer 1

You could inject a script element into HEAD of the document with a callback that passes the cookie you need to whatever function needs it.

Something like:

 <script type="text/javascript">
   var newfile=document.createElement('script');
   newfile.setAttribute("type","text/javascript");
   newfile.setAttribute("src", 'http://first.com/doAjax?getCookie&callback=passCookie');
   document.getElementsByTagName("head")[0].appendChild(newfile);
 </script>

And the page first.com/doAjax?getCookie could do this:

     passCookie({'name':'mycookie', 'value':'myvalue'});

Answer 2

For SETTING cookies you can change my script as follows:

The new PHP-Script:

//writecookie.php
setcookie($_GET['c'], $_GET['v']);

And the JavaScript:

function buttonClickOrAnything()
{
  var refreshObject = new XMLHttpRequest();
  if (!refreshObject)
  {
    //IE6 or older
    try
    {
      refreshObject = new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch (e)
    {
      try
      {
        refreshObject = new ActiveXObject("Microsoft.XMLHTTP");
      }
      catch (e)
      {
        return;
      }
    }
  }
  refreshObject.open("GET", "http://www.first.com/writecookie.php?c=cookiename&v=cookievalue");
  refreshObject.send();
}

That should work on all browsers.

Answer 3

Put this PHP-File to first.com:

//readcookie.php    
echo $_COOKIE['cookiename'];

On second.com you can use this javascript to get the value:

function readCookieCallback()
{
   if ((this.readyState == 4) && (this.status == 200))
   {
     alert("the value of the cookie is: "+this.responseText);
   } 
   else if ((this.readyState == 4) && (this.status != 200))
   {
     //error...
   }
}


function buttonClickOrAnything()
{
  var refreshObject = new XMLHttpRequest();
  if (!refreshObject)
  {
    //IE6 or older
    try
    {
      refreshObject = new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch (e)
    {
      try
      {
        refreshObject = new ActiveXObject("Microsoft.XMLHTTP");
      }
      catch (e)
      {
        return;
      }
    }
  }
  refreshObject.onreadystatechange = readCookieCallback;
  refreshObject.open("GET", "http://www.first.com/readcookie.php");
  refreshObject.send();
}

Regards, Robert