Tracking Zero Result Searches

Interesting... and the most difficult part will be to get out if there are search results or not.

Please provide a patch.

This is very specific to themes... not sure how to solve. Aside you can implement it with custom javascript before and after snippets... it would only looks not very nice :-(. At least "sn" and the regex need to be changed for Drupal... 'content' ID may be unavailable in a theme and 'Your search yielded no results' may be translated and a bit more issues...

Snippet (Before):

var content = document.getElementById('content');
if (content.innerHTML.search('Your search yielded no results')) {
     // These lines get the search data from the URL and 
     //  deconstruct the URL into parts 
     var sn = "s"; 
     var sr = new RegExp(sn+"=[^\&]+"),
      p = document.location.pathname,
      s = document.location.search,
      sm = s.match(sr).toString(),
      srs = sm.split("="),
      // The next line is where we add the category and add
      // the phrase no-results to the search term.
      sre = sm.replace(sr,srs[0]+"=no-results: "+srs[1]+"&cat=no-results"),
      sf = s.replace(sr,sre);
      // Send the data to Google as a Pageview
      pageTracker._trackPageview(p+sf);
} else {
      // If this is a regular page on the site, use the standard GA code.

Snippet (After):

}

As said - this *hardly* depends on theme HTML code. I have no idea how to implement this in a generic way if core does not provide us the number of found results in a hook or via a function calll :-(. If someone is able to come up with a way I would be happy to implement this.

Let's investigate if there is a way in D7...

Found something, but need to dig deaper... And do some testing

http://api.drupal.org/api/drupal/modules--search--search-results.tpl.php... with Your search yielded no results.
http://api.drupal.org/api/drupal/modules--search--search.pages.inc/funct...

Implemented search result counter in piwik successfully. Can be ported, but I would also be interested to always get the results and not only if there is no result.

Committed to D6 and D7