how to know the current Zoom level in D3.js

Question

I have a problem since a few days. I have a graph and when I use Zoom Behavior it works, but I need to know when I reach maximum zoom to load new given

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Answer 1

As of D3 v4 there are two documented ways of retrieving the zoom state. To quote d3/d3-zoom README (under Zoom Transforms):

To retrieve the zoom state, use event.transform on a current zoom event within a zoom event listener (see zoom.on), or use d3.zoomTransform for a given node.

https://github.com/d3/d3-zoom/blob/master/README.md#zoom-transforms