Last week, I needed to add many axes to a single D3 svg. I had a set of sets of data points, and I wanted each of these sets of data to be rendered with its own x and y axes.

To do this, I wrote the following:

```
var locationArea = bar.append("g")
.attr("transform", function(d) { return "translate(200," + 24*(+d.length) + ")"; })
.attr("class", function(d, i) { return "locations n_".concat(i) });
var locationXAxes = locationArea
.each(function (d, i) {
var lat_scale = d3.scale.linear()
.range([-50, 50])
.domain([d3.min(d.locations, function(d) { return d[0]; }),
d3.max(d.locations, function(d) { return d[0]; })]);
var axis = d3.svg.axis()
.scale(lat_scale)
.orient("bottom")
.ticks(3);
d3.selectAll(".n_".concat(i)).append("g")
.attr("class", "x axis")
.attr("transform", "translate(0, 60)")
.call(axis);
});
```

For each set of data points, a new D3 scale is created, and a new axis is created from that scale. Then, the group created previously is selected and the axis is appended to that specific group.

There’s probably a better way to do this, but this worked.