The support for the evaluation of nested plugins opens the door for charts and graphs with dynamic data.

A great "data generator" is the JavaScript evaluator plugin JSPlugin. Note that you will need to use the parameter setting scriptResult=xml to generate raw data instead of HTML (the default).

The next example uses a nested call to JSPlugin to create a simple Bar Chart of strings and their lengths:

[{ BarChartPlugin title='Name Lengths' 

[{JSPlugin scriptResult='xml'

var countries = new Array("Norway", "France", "Denmark", "Venezuela");
var result = ":Country|String, Value\n";
for ( i = 0; i < countries.length; i++ ) {
   result += countries[i] + ", " + countries[i].length + "\n";
};
result;
}]

}]

This example uses the JSPlugin interface to the wiki internals to generate a Pie Chart with the aggregation of recent changes per author.

[{ PieChartPlugin title='Recent Changes By Author' 

[{JSPlugin scriptResult=xml

var myDate = new Date();
myDate.setDate(myDate.getDate() - 30); 
result = "";
authors = new Array();
for ( i = wikiInfo.pages.iterator(); i.hasNext(); ) {
  page = i.next();
  if (page.getVersions().size() > 0) {
    version = page.getVersions().get(0);
    pageJavaDate = version.getModified();
    pageDate = new Date();
    pageDate.setTime(pageJavaDate.getTime());     
    if (pageDate > myDate) {
      if (! authors[version.author]) {
        authors[version.author] = 1;
      } else {
        authors[version.author] += 1;
      }
    }
  }
}
for (author in authors) {
  result += author + ", " + authors[author] + "\n";
}
result;
}]

}]