selecting transitioning objects

[SumNeuron]

As I have used d3 more and more, I have written my own collection of functions built on top of d3 and even modularized them, where is when I have come across this issues.

The issue is as follows.

I have a selection (of objects that I am fairly confident have already been added to the DOM), to which I apply a transition (it could even be for 0ms). Some other function - after the transition is invoked - would like to add something to this selection.

However, when I try to select these objects, they do not exist.

I am now aware of the transition end option; however, this does not really solve my problem.

Is there a way to select objects that have a transition and edit the transitioning selection?

Alternatively, is there a way to try and select something and then ask when the selection ends? (after the transition has been invoked?)

I have found that transitions can be quite problematic, when data changes mid transition.

Please see the comments here
https://stackoverflow.com/questions/50400352/svg-html-getbbox-and-getboundingclientrect-not-the-same-as-when-hover-over-no/50401806?noredirect=1#comment87884972_50401806

[mbostock]

You can reselect and modify a transition by passing it into selection.transition. For example:

https://beta.observablehq.com/d/e0ede4a95638d022

You can listen to the end of a transition using transition.on. See also #77.