Question

I have problem with accessing Facebook graph. I am using a Greasemonkey script. When I use the same script in chrome’s Tampermonkey it works well, and I can get data.

In Firefox nothing happens, I think maybe it’s because of cross-domain restrictions. Am I right, and is there a way this can be solved?

Forgot to mention, in Firefox only works if I am on graph.facebook.com.

edit:

var my_id = 1111111111;
var req = new XMLHttpRequest();
req.open('GET', 'https://graph.facebook.com/'+my_id, false); 
req.send();
var contents = req.responseText;
alert(contents);

Answer 1

XMLHttpRequest does not support cross-domain requests. (You say this works in Tampermonkey though??!? Tampermonkey supports GM_xmlhttpRequest() so it might have extended cross-domain XHR to XMLHttpRequest(), maybe.)

Nevertheless, to get this to work in Greasemonkey (and Chrome userscripts, and Tampermonkey), you need to use GM_xmlhttpRequest() — which allows cross domain requests.

So the code from the question would become:

var my_id = 1111111111;

GM_xmlhttpRequest ( {
    method:         'GET',
    url:            'https://graph.facebook.com/' + my_id,
    onload:         function (responseDetails) {
                        var contents = responseDetails.responseText;
                        alert (contents);
                    }
} );

Note that GM_xmlhttpRequest() operates asynchronously. (It has a somewhat dicey synchronous mode but that is not recommended.)