Hi all,

I want to be able to toggle between two data sets with a button, so
each time the button gets clicked the pie chart changes to the other
data set. I've found a solution to switch to another data set (see
below) but I can't figure out how I van make it toggle back. I don't
know if this is even possible. This would also imply that the button
text changes (f.i. from "show data set 1" to "show data set 2").

<html>
<head>
<script type="text/javascript" src="http://www.google.com/jsapi "></
script>
                                <script type="text/javascript">
                                google.load("visualization", "1", {packages: 
["piechart"]});
                                google.setOnLoadCallback(initialize);

                var v;
                                function initialize() {
                                var dt = new google.visualization.DataTable();
                                dt.addColumn('string');
                                dt.addColumn('number');
                                dt.addRows(3);

                                dt.setCell(0, 0,'L1');
                                dt.setCell(1, 0,'L2');
                                dt.setCell(2, 0,'L3');

                                dt.setCell(0, 1,123);
                                dt.setCell(1, 1,234);
                                dt.setCell(2, 1,345);

                v = new
        
google.visualization.PieChart(document.getElementById('chart_div'));
         v.draw(dt, {});
          }
function f1() {
 var dt = new google.visualization.DataTable();
        dt.addColumn('string');
                                dt.addColumn('number');
                                dt.addRows(2);

                                dt.setCell(0, 0,'NL1');
                                dt.setCell(1, 0,'NL2');

                                dt.setCell(0, 1,100);
                                dt.setCell(1, 1,200); v.draw(dt, {}); }
</script>
</head>
<body>
<div id="chart_div" style="width: 400px; height: 300;"></div>
<input type='button' onclick='f1()' value='test' />

</body>
</html>

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