In what sense do you mean "saving" the chart? You could call the
getChartWrapper() method, serialize it to a JSON string, and then save it
in a session variable or cookie. You can't save the chart as an image or
anything like that, though.
You could also, conceivably, save the contents of the iframe, though I
believe you would lose the interactive features of the chart in doing so.
jQuery can get the contents of the iframe using something like this:
$('#my_chart_div').find('iframe').contents();
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