NVD3访问图表对象

Question

In previous version's of nvd3您可以执行以下操作来访问图表/图表对象。

chart = nv.graphs[0];

然而，在最近的版本中，这似乎已被删除：

nv.graphs -> undefined
nv.graphs[0] -> TypeError: nv.graphs is undefined

是否有其他方法可以访问图表元素？

chart = nv.graphs[0];
a = chart.brushExtent();

这里有一个简单的jsfiddle，你可以在其中看到这个，

http://jsfiddle.net/0m8jzetx/3/

Here is the git issue where they remove it.

Answer 1

I don't have a real answer, but have found something that may help accessing brushextents:
Rather than declaring chart as a global var, you can declare 2 global var for your extents, and update them when brush is updated, like so:

chart.dispatch.on('brush.update', function(b) {
  curve_focus_min = b.extent[0];
  curve_focus_max = b.extent[1];
});