// type can be namespaced, e.g., "click.foo"

// listener can be null for removal

d3_selectionPrototype.on = function(type, listener, capture) {

  if (arguments.length < 3) capture = false;

  // parse the type specifier

  var name = "__on" + type, i = type.indexOf(".");

  if (i > 0) type = type.substring(0, i);

  // if called with only one argument, return the current listener

  if (arguments.length < 2) return (i = this.node()[name]) && i._;

  // remove the old event listener, and add the new event listener

  return this.each(function(d, i) {

    var node = this;

    if (node[name]) node.removeEventListener(type, node[name], capture);

    if (listener) node.addEventListener(type, node[name] = l, capture);

    // wrapped event listener that preserves i

    function l(e) {

      var o = d3.event; // Events can be reentrant (e.g., focus).

      d3.event = e;

      try {

        listener.call(node, node.__data__, i);

      } finally {

        d3.event = o;

      }

    }

    // stash the unwrapped listener for retrieval

    l._ = listener;

  });

};