Thanks for your answer. Meanwhile I have found a solution. In my controller file, I have added a new column in the array I send to my view file. This column contains an array with all the activities for each seances. So in my view file I can use my data as I want.
The final result : <https://lh3.googleusercontent.com/-kekzslmYqiI/VA7nEraufBI/AAAAAAAAADk/AbAvxQqTezs/s1600/result.png> Thanks for all. -- You received this message because you are subscribed to the Google Groups "Google Visualization API" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/google-visualization-api. For more options, visit https://groups.google.com/d/optout.
