pie chart update or how to send values from gridview to pie chart to update - dojo

I am using dojo pie chart in my application..
I have dojo pie chart and bar grpah... My questions is now i need to update those two things..
that is.. above the charts I have gridview with user data.. I need to pass certain values from gridview to pie chart or bar grpahs to update..using javascript or jquery

Try the new DataPresentation widget

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