So you basically monitor ajaxComplete to see if the elements you want have been created

ajaxComplete

jQuery(document).bind('ajaxComplete', function(e, xhr, settings) {
    // Check to see if this AJAX call is the one you want
    if($("#whatever").length) {
        // Do something
    }

    // Or just check the URL to see if it's the AJAX call to the page we want:
    if(settings.url.match(/my-url/)) {
        // Do something
    }
});