Paste at the bottom of a webpage

track_events.js

// See: http://gist.github.com/537133
// standard script to track clicks on document elements, and send google analytic events
// identifying which element was clicked (classname, id, href, src, csspath)
// if "cssprefix_optional" is null, identify element as either using classname, id, href, src, csspath (order of preference)
// if "pagename_optional" is null, identify "event category" as page filename
(function(jQuery, pageTracker, cssselector, cssprefix_optional, pagename_optional) {
  if (! jQuery) return;
  try {
    var baseurl = window.location.href.split(/[?#;]/)[0];
    var pathsegments = baseurl.split('/');
    var filename = unescape(pathsegments.pop() || pathsegments.pop());
    if (! pagename_optional) pagename_optional = filename;
    var basepath = pathsegments.join('/') + '/';
    function log() { window.console && window.console.log && console.log(arguments); }
    function element2identifier(element) {
      var match = cssprefix_optional && (element.className || "").match('\\b' + cssprefix_optional + '-(\\w+)\\b');
      return (match && match[1]) || (element.id && ('#' + element.id)) || (element.className && ('.' + element.className.replace(/\s+.*$/, ''))) || (element.href || element.src || "").replace(baseurl, '').replace(basepath, '');
    }
    var trackEvent =
      (pageTracker && function(category, action, opt_label, opt_value) { log(arguments); pageTracker._trackEvent(  category, action, opt_label, opt_value ); }) ||
      (window._gaq && function(category, action, opt_label, opt_value) { log(arguments); _gaq.push(['_trackEvent', category, action, opt_label, opt_value]); }) ||
      log;
    trackEvent(pagename_optional, 'pageview');
    jQuery(document.body).ready(function() {
      jQuery(cssselector).click(function(evt) {
        try {
          var identifier = element2identifier(this);
          if (!identifier) {
            identifier = this.tagName;
            jQuery(this).parents().each(function(index, parent) {
              if (parent.className) identifier = '.' + parent.className.replace(/\s+.*$/, '') + ' ' + identifier;
              if (parent.id) identifier = '#' + parent.id + (parent.className ? '' : ' ') + identifier;
              identifier = parent.tagName + ((parent.id || parent.className) ? '' : ':nth(' + jQuery(parent).prevAll().length + ') ') + identifier;
            });
          }
          trackEvent(pagename_optional, identifier.toLowerCase());
        } catch (e) {
          log(e);
        }
      });
    });
  } catch (e) {
    log(e);
  }
})(window.jQuery, window.pageTracker, 'a,input,textarea,button');