Filtering on brushend

This is basically for cases where filtering is happening asynchronously(via AJAX). Right now the filtering happens as the user drags the brush. Now if the filtering is computationally expensive, or say, happening remotely, this causes a great lag, often not allowing the brushing to happen smoothly. With filtering on brush end, the filtering happens only when the brush is set. I found a workaround, by removing the filtering code from brushing() function, and adding it to brushend()

[nreese]

I am using the 2.0.0-beta.19 and am still experiencing lag when brushing. It would be useful to have the ability to completely turn off filtering until the brushend event is fired.

How would you envision this implemented at the API level? Maybe a new property to specify when to apply the brush with a default value of BRUSHMOVE and setable to BRUSHEND?

For example,

dc.barChart()
  .brushOn(true)
  .brushApply(dc.consts.brushend)

[gordonwoodhull]

Nope, not yet. If you want to help this along, you can try out PR #898 and leave a review of the functionality and or code on that ticket. Thank you!