The post() function contains the GM_xmlhttpRequest() function, and
(I assume) GM_xmlhttpRequest() returns the target page, but it
doesn't store or return the data returned by GM_xmlhttpRequest().
You have this:
function post(url, data, cb) {
GM_xmlhttpRequest({...});
}
I think you want this:
function post(url, data, cb) {
return GM_xmlhttpRequest({...});
}
I could be wrong, but I think an asynchronous GM_xmlhttpRequest
always returns undefined, and a synchronous request always returns
the response object. The return from the callbacks is ignored, so a
return in one of the callbacks is pointless. If you want the callback
to do something with the data it gets, you have do something explicit
with it, which is usually add it to the page somehow.
I think you're right - I forgot about synchronous vs. asynchronous
(It's been a while since I used an xmlhttprequest) It's the onload:
function defined within the command that is executed on completion of
the command, right? So that code needs to specify what to do with
responseText (add it to the page, or call another function to process
it).
Yes, onload is called when the request is complete (assuming it
succeeds, onerror is called if it fails), so that's where if you want
something done with the response (which is the usual case, although not
the only one) you need to explicitly do something with responseText,
like modify the page somehow.
Brian
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