Facebook Using code from different domains

Question

I am creating a widget in js that will be implemented across many websites,
Facebook requires me to give them "my domain" so they will know that I am verified.
The problem is that the widget will be used from many websites, and I am not going to manuly list all of those domains to Facebook.
How can I enable my app to work from those different websites using js only? (for the widget)

Thanks in advance.

Answer 1

i use ajax for something similar. i ajax to a php page, and use the php sdk for all the requests. cross domain just fine.

EXAMPLE: should request most recent albums updated on facebook and display cover photo linked to the album on facebook.

<div id="pagealbums"></div>
<script>
function showAlbums(){
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttpA=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttpA=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttpA.onreadystatechange=function()
  {
  if (xmlhttpA.readyState==4 && xmlhttpA.status==200)
    {
    document.getElementById("pagealbums").innerHTML=xmlhttpA.responseText;
    }
  };
  xmlhttpA.open("GET","http://anotherfeed.com/feed.albums.php?pageid=facebook&type=list",true);
  xmlhttpA.send(); 
}
showAlbums();
</script>