René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Marshal `_indexToPoints` to interaction events; other additions","articleBody":"We have [added logic](https://github.com/plotly/plotly.js/pull/2126#pullrequestreview-72393089) to `transforms` such that the ultimate results of `transforms` can be associated with the original data points, via their positional indices. This way, interacting with e.g. an aggregate bar, the original points can be known, which is crucial for `crossfilter` to work, among other possible uses.\r\n\r\nThe linked PR took care of the logic but exposing it via events is a useful next step: https://github.com/plotly/plotly.js/pull/2126#pullrequestreview-72395582\r\n\r\nBesides this, other changes are needed:\r\n\r\n- [x] cover `groupBy`and `sort` transforms as well (`groupBy` is not currently working with `crossfilter`, so it was less of a priority) done in https://github.com/plotly/plotly.js/pull/2162\r\n- [x] extract the few lines that are identical between the `filter.js` and `aggregation.js` implementations\r\n- [ ] add more test cases with various `transforms` sequences","author":{"url":"https://github.com/monfera","@type":"Person","name":"monfera"},"datePublished":"2017-10-27T07:31:48.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/2128/plotly.js/issues/2128"}