Using Google's annotated timeline in the Visualizations API, can you insert annotations regardless of data set? - google-visualization

Question

I can insert annotations on specific datasets on the graph but I wish to have multiple lines on the graph without associating the annotation with a specific line, but with a date instead.
Here is an example of what I want to do. Notice the bubbles appended to the x-axis and not a specific line on the graph.
I've read through the API and can't see an option like this but wondering if someone knows a way.
Thanks.

Answer 1

No experience, but my instant reaction was that you might try a series with the annotations attached with all zeros as the data - and exclude it from the legend?

Answer 2

If you don't mind using an SVG Line Chart with Annotations you can recreate this as well with more flexibility. If you set the Annotation column to immediately follow the X-axis values, the annotations will appear at the very bottom of the chart (on the axis) and not be attached to any category. Here is a sample:
function drawVisualization() {
// Create and populate the data table.
var data = new google.visualization.DataTable();
data.addColumn('number','Day');
data.addColumn({type: 'string', role: 'annotation'});
data.addColumn({type: 'string', role: 'annotationText'});
data.addColumn('number', '.DJI');
data.addColumn('number', '.INX');
data.addColumn('number', '.INIC');
data.addRows([
[1, null, null, 1000, 400, 300],
[2, 'A', 'did stuff', 1170, 460, 400],
[3, 'B', 'did more stuff', 660, 1120, 540],
[4, null, null, 1030, 540, 620],
[5, 'C', 'stopped stuff', 1070, 600, 700]
]);
// Create and draw the visualization.
new google.visualization.LineChart(document.getElementById('visualization')).
draw(data, {focusTarget: 'category',
width: 500, height: 400,
vAxis: {maxValue: 10},}
);
}
This ends up looking like this: