inheritance.js

// a simple adaptation of http://bl.ocks.org/d3noob/8375092 for displaying
// inherited DOM interfaces
var width = 960,
    height = 1200;
var margin = {top: 20, right: 120, bottom: 20, left: 120};
var svg = d3.select("body").append("svg")
    .attr("width", width + margin.right + margin.left)
    .attr("height", height + margin.top + margin.bottom)
    .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var tree = d3.layout.tree()
    .size([width, height]);

var diagonal = d3.svg.diagonal()
	.projection(function(d) { return [d.y, d.x]; });

function listChildren(parentName, interfaces) {
    return Object.keys(interfaces).filter(n => interfaces[n].inheritance === parentName).map(n => {return {name: n, parent, parentName, children: listChildren(n, interfaces)};});
}

d3.json("https://w3c.github.io/webref/ed/crawl.json", function(json) {
    var links = [];
    var nodes = [];
    var interfaces = json.results.filter(s=> s.idl && s.idl.idlNames)
        .map(s => s.idl.idlNames)
        .reduce((a,b) => { Object.keys(b).forEach(k => { if (b[k].type === "interface") { a[k] = b[k];} }); return a;},{});
    var rootName = "EventTarget";
    var domInheritance = [{
        name: rootName,
        parent: null,
        children: listChildren(rootName, interfaces)
    }];

    var root = domInheritance[0];
    root.x0 = height / 2;
    root.y0 = 0;
    var i = 0, 	duration = 750;
    update(root);

    function update(source) {

  // Compute the new tree layout.
  var nodes = tree.nodes(root).reverse(),
	  links = tree.links(nodes);

  // Normalize for fixed-depth.
  nodes.forEach(function(d) { d.y = d.depth * 180; });

  // Update the nodes…
  var node = svg.selectAll("g.node")
	  .data(nodes, function(d) { return d.id || (d.id = ++i); });

  // Enter any new nodes at the parent's previous position.
  var nodeEnter = node.enter().append("g")
	  .attr("class", "node")
	  .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; })
	  .on("click", click);

  nodeEnter.append("circle")
	  .attr("r", 1e-6)
	  .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

        nodeEnter.append("a")
            .attr("xlink:href", function(d) { return  "./?idlname=" + d.name;} )
            .append("text")
	  .attr("x", function(d) { return d.children || d._children ? -13 : 13; })
	  .attr("dy", ".35em")
	  .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; })
	  .text(function(d) { return d.name; })
	  .style("fill-opacity", 1e-6);

  // Transition nodes to their new position.
  var nodeUpdate = node.transition()
	  .duration(duration)
	  .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });

  nodeUpdate.select("circle")
	  .attr("r", 10)
	  .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

  nodeUpdate.select("text")
	  .style("fill-opacity", 1);

  // Transition exiting nodes to the parent's new position.
  var nodeExit = node.exit().transition()
	  .duration(duration)
	  .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
	  .remove();

  nodeExit.select("circle")
	  .attr("r", 1e-6);

  nodeExit.select("text")
	  .style("fill-opacity", 1e-6);

  // Update the links…
  var link = svg.selectAll("path.link")
	  .data(links, function(d) { return d.target.id; });

  // Enter any new links at the parent's previous position.
  link.enter().insert("path", "g")
	  .attr("class", "link")
	  .attr("d", function(d) {
		var o = {x: source.x0, y: source.y0};
		return diagonal({source: o, target: o});
	  });

  // Transition links to their new position.
  link.transition()
	  .duration(duration)
	  .attr("d", diagonal);

  // Transition exiting nodes to the parent's new position.
  link.exit().transition()
	  .duration(duration)
	  .attr("d", function(d) {
		var o = {x: source.x, y: source.y};
		return diagonal({source: o, target: o});
	  })
	  .remove();

  // Stash the old positions for transition.
  nodes.forEach(function(d) {
	d.x0 = d.x;
	d.y0 = d.y;
  });

        // Toggle children on click.
function click(d) {
  if (d.children) {
	d._children = d.children;
	d.children = null;
  } else {
	d.children = d._children;
	d._children = null;
  }
  update(d);
}
}
});