vega-lite: adding event listener on brush

[Speros Kokenes]

Hi, new to vega-lite. Worked through the tutorials, now trying to see if I can get some selections working. I added a brush to the y-axis of a bar chart. I want to trigger some external javascript based on that brush. For example, I may want to know what bars are within the brush and run some external code with the data for those bars. How would I do that?

Here is a JSFiddle that has my chart set up with a brush

https://jsfiddle.net/epam1srf/

[kent.r...@timelyportfolio.com]

I'd love to see an answer with best practice regarding your question.  I am not sure if relevant since vega but here is a discussion and example in vega

https://groups.google.com/forum/?fromgroups=#!searchin/vega-js/data-flow/vega-js/bdVTfadlhzM/s-s3DGPoAgAJ.