There may be a hack around the legend if you can identify it in the chart's
SVG with some degree of reliability. The tooltips you can control by
setting the formatted value of data points, which will be displayed instead
of the numerical value. If you don't want anything to show up, set the
formatted value to an empty string.
I got this code to work using the GeoChart example on the visualization
playground (requires jQuery):
google.visualization.events.addListener(geochart, 'ready', function () {
$('#visualization').find('iframe').contents().find('svg').children('g').
last().prev().remove();
});
This may or may not be reliable, as the playground chart is the only one I
tested it on. You should be able to tweak it to your own needs, though.
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