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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


instead of


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?

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1 Answer

up vote 4 down vote accepted

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)

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

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

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Very cool. Thank you! –  GeoffreyF67 Feb 8 '09 at 22:50
What's the syntax for multiple parameters? Do you just add a comma after the k? e.g. }(k,x) –  Doug Dec 27 '13 at 17:27
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