d3.active(node[, name])
Returns the active transition on the specified node with the specified name, if any. If no name is specified, null is used. Returns null if there is no such active transition on the specified node. This method is useful for creating chained transitions. For example, to initiate disco mode:
d3.selectAll("circle").transition()
.delay(function(d, i) { return i * 50; })
.on("start", function repeat() {
d3.active(this)
.style("fill", "red")
.transition()
.style("fill", "green")
.transition()
.style("fill", "blue")
.transition()
.on("start", repeat);
});See chained transitions for an example.
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