Question

I have a simple greasemonkey script that makes some simple dom manipulation. The greasemonkey script is loaded after the DOM is loaded, that’s fine so fare and it does work for the initial Page. But on this site (it’s twitter 😉 ) parts of the page get loaded after a click by xmlhttprequest and this part did not get manipulated by my greasemonkeyscript.

Is there a simple possibility to run the script again after the xmlhttprequest is loaded or after the DOM is changed by the request?

Answer 1

Thanks Howard. It was the way in the right direction.

It’s quite hard to find the right entry point to hijack a function on a minifyied script. But I found that there is a huck in the twitter script. It does call window.onPageChange after the Ajax request. (I wonder if this is a common best practice in javascript and if other do this as well?) I did found some code on http://userscripts.org/scripts/review/47998 wich does use this posibility to attach events.

        if (typeof unsafeWindow.onPageChange === 'function') {
        var _onPageChange = unsafeWindow.onPageChange;
        unsafeWindow.onPageChange = function(){
            _onPageChange();
            filter();
        };
    } else {
        unsafeWindow.onPageChange = filter;
    }