Page with Selects and a Chart

Hi! I've created a "Sales" page, with 2 selects on it, and a table. I load the data for each select when changed. Everything is ok. But now, I would like to add a line Chart. I've tried to ways: - If I create a Widget, render it with getFooterWidgets, but the widget get's its data in the widget class, I don't know how to send the value of selects in the page to the widget. - I can render a chart in the view... now trying... So I decided to ask here for help.. any example I could use? Tanks!