each method

Selection each(EachCallback<void> function)

Invokes the specified function for each selected element, in order, being passed the current datum (d), the current index (i), and the current group (nodes), with thisArg as the current DOM element (nodes[i]).

This method can be used to invoke arbitrary code for each selected element, and is useful for creating a context to access parent and child data simultaneously, such as:

parent.each((Element thisArg, JSAny? p, int j, List<Element?> nodes) {
  d4.select(thisArg.u22).selectAll(".child".u22).textSet(
        (Element thisArg, JSAny? d, int i, List<Element?> nodes) {
          return "child ${(d as JSBoxedDartObject)["name"]} of ${(p as JSBoxedDartObject)["name"]}";
        }.u21,
      );
});

See sized donut multiples for an example.

Implementation

Selection each(EachCallback<void> function) {
  for (var groups = _groups, j = 0, m = groups.length; j < m; ++j) {
    Element? node;
    for (var group = groups[j], i = 0, n = group.length; i < n; ++i) {
      if ((node = group[i]) != null) {
        function(node!, (node as JSObject)["__data__"], i, group);
      }
    }
  }
  return this;
}