You can hook the 'rangechange' event to capture changes in zoom level.
Something like this should work:
google.visualization.events.addListener(chart, 'rangechange', function () {
if (chart.getVisibleRange().end - chart.getVisibleRange().start >
3600000) {
// if the zoom range is > 1 hour (3.6 million microseconds), hide
minutes and show hours
}
else {
// if the zoom range is < 1 hour, hide hours and show minutes
}
});
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