Help with Timeline: Is there an easy way to add and position a place marker overlay or point over a timeline bar?

[Phil Agee]

Howdy,

I have a google.visualization.Timeline (bars using birth and death dates of persons) and would like to add markers on top of bars for events relating to specific bars.

I tried using a combination of the visualization documentation example for a google.visualization.Timeline together with the example of google.visualization.LineChart with placeMarker function.

My references to examples are:

https://developers.google.com/chart/interactive/docs/gallery/timeline

https://developers.google.com/chart/interactive/docs/overlays#positioning-overlaysrelative-to-data

However, after trying to combine these 2 examples, I get the error:

 this.getChartLayoutInterface is not a function

So it seems that the Timeline does not support getChartLayoutInterface.  

I also don't see series or points as options in the Timeline options list.

Is there another way to add markers or points to a timeline bar at this time?

Thanks!

[Daniel LaLiberte]

Phil,

Good guess about how to get the features you want, but unfortunately, the Timeline chart is written in a different framework from the Corecharts.  We do plan to integrate all the charts on the same framework, but that work is still in progress.

So for now, you'll have to get by without the getChartLayoutInterface.  A workaround you might want to try is to overlay a Scatter chart on your Timeline chart, and then position your markers relative to the Scatter chart.

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Daniel LaLiberte

dlaliberte@Google.com   5CC, Cambridge MA

[Iris Huang]

It has been two years. Any progress on this feature? I am also interested in put some no duration task such as milestone on the timeline. If not of the box, any work around? Thanks.

[shyam.ag...@gmail.com]

Hi,

Any update on adding Milestone or any Market in Timeline chart? We have a requirement to display Milestone in bar based on end time.

Thanks,

Shyam