Which architecture to choose when getting data from database

Following case:

I have an HTML document, in which I want to draw graphs (e.g. http://ift.tt/1qiOwqs)

So I have this HTML file, with all the etc...

Now the data for the graphs are in a database table. How should I get the data? Should I have a Java-backend accessing the database and refreshing the HTML, or can I do something directly in the HTML?