I suspect that the problem is that every time you call the draw method, the
API adds another copy of the 'select' event handler to the chart. Removing
the 'ready' event handler after it is first called will fix the problem if
this is indeed the cause. Try this:
var ready = google.visualization.events.addListener(chart, 'ready',
function () {
google.visualization.events.addListener(chart, 'select', function ()
{....});
google.visualization.events.removeListener(ready);
});
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