If you look at the code below and switch the seriesType value from bars and
lines, you'll notice that the annotations appear when it's a line, but not
when it's a bar.
> function drawVisualization() {
>
> var data = new google.visualization.DataTable();
>
> data.addColumn('string', 'Quarter'); // Implicit domain column.
> data.addColumn('number', 'Sales'); // Implicit data column.
> data.addColumn({type:'string', role:'annotation'});
> data.addRows([
> ['q1', 165, 'A'],
> ['q2', 135, 'B'],
> ['q3', 157, 'C'],
> ['q4', 139, 'D'],
> ]);
> // Create and draw the visualization.
> var ac = new google.visualization.ComboChart(document.getElementById(
> 'visualization'));
> ac.draw(data, {
> title : 'Monthly Coffee Production by Country',
> width: 600,
> height: 400,
> seriesType: "bars"
> });
> }
>
>
>
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