Is there a way to pass a value TO GM_xmlhttprequest?

Question

As indicated here:

How can I return a value from GM_xmlhttprequest?

I have a script that is asynchronous. I would like to pass a value INTO this function so that when the onload function is called I can use it to display in the web page.

The challenge I'm having is that this value will change each time I pass it into the function.

So, for instance if I passed in 'abc', 'def', 'xyz'.

I would end up with

xyz
xyz
xyz

instead of

abc
def
xyz

So, my question is, how would I pass a value into this function so that each call of the function knows what to display when it's done?

Answer 1

You are looking for a closure:-

var urls = {"abc": "http://somehost/aurl",
           "def": "http://somehost/otherurl",
           "ghi": "http://someotherhost/aurl" }

for (var k in urls)
{

    GM_xmlhttpRequest({
        method: 'GET',
        url: urls[k],
        onload: function(text) {
            return  function(xhr) {
                //Do stuff with xhr responseText etc and the text parameter
                alert(text)
            }
        }(k)
    }
}

This will alert "abc", "def" and "ghi" after each outstanding request completes.