How can I select :last-child in d3.js?

Question

I need to manipulate the text elements of the first and last tick of an axis to bring them more towards the center.

I am trying to select them, one at t

Answer 1

One thing you could do is to create custom sub-selections by adding methods to d3.selection.prototype. You could create a selection.first() method that selects the first item in a selection, and a selection.last() method that selects the last item. For instance:

d3.selection.prototype.first = function() {
  return d3.select(this[0][0]);
};
d3.selection.prototype.last = function() {
  var last = this.size() - 1;
  return d3.select(this[0][last]);
};

This would let you do the following:

var tickLabels = svg.selectAll('.tick text');

tickLabels.first()
  .attr('transform','translate(4,0)');
tickLabels.last()
  .attr('transform','translate(-4,0)');

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Of course, you need to make sure that you only have one axis if you do it that way. Otherwise, specify the axis in your initial selection:

var tickLabels = svg.selectAll('.axis.x .tick text');

HERE is an example.