The javascript function "document.getElementById(id)" fetches the HTML
element with the given id. In this case, you want to use div's to hold your
charts, so you need one div for each chart you draw. You could do:
<div id="chart_div_1"></div>
<div id="chart_div_2"></div>
<div id="chart_div_3"></div>
to hold three charts. The chart objects would be created like this:
var chart1 =
new google.visualization.ColumnChart(document.getElementById('chart_div_1'));
var chart2 =
new google.visualization.ColumnChart(document.getElementById('chart_div_2'));
var chart3 =
new google.visualization.ColumnChart(document.getElementById('chart_div_3'));
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