title: Visualization with JavaScript of data from a JSON source?
body: <p>I would like to use a library like the <a href="http://code.google.com/apis/chart/index.html" rel="nofollow">Google Visualization API to draw charts</a>, but taking the data as JSON from an external source. The context is to use <a href="http://sparql.org/query.html" rel="nofollow">some SPARQL service</a> to extract the data from a XHTML+RDFa source, as described <a href="http://www.pharmash.com/posts/2010-09-27-sparql-to-chart.html" rel="nofollow">here</a>. But that latter page has to use a trick, but points out that it would be great that these visualization toolkits can take data input directly from JSON returned by some web page.</p>
  
  <p>Is there a chart visualization library that supports taking the data it visualizes directly from a JSON-returning URL?</p>