D3 Zoomable Treemap - Need tooltip boxes

<!DOCTYPE html>
<html>
	<meta charset="utf-8">
	<title>Zoomable Treemap</title>

<style>

@import url(./base-style.css);
	@import url(./treemap-style.css);

</style>

<header>
	 <em>Click any cell to zoom in.  Click on the top orange label to zoom out.</em>
	  <aside>Last Updated January 20, 2014</aside>
	 </header>

<h3>Zoomable Treemap of NIFA 2013 Grant Awards</h3>

<p>The treemap above uses interaction to reveal the hierarchy incrementally: clicking on a node zooms in. Only two levels of the hierarchy are visible at a time.

<footer>
	  Original D3 Zoomable Treemap Design by Mike Bostock in 2012
	</footer>

</html>

var margin = {top: 20, right: 0, bottom: 0, left: 0},
    width = 960,
    height = 500 - margin.top - margin.bottom,
    formatNumber = d3.format(",d"),
    transitioning;

var x = d3.scale.linear()
    .domain([0, width])
    .range([0, width]);

var y = d3.scale.linear()
    .domain([0, height])
    .range([0, height]);

var treemap = d3.layout.treemap()
    .children(function(d, depth) { return depth ? null : d._children; })
    .sort(function(a, b) { return a.value - b.value; })
    .ratio(height / width * 0.5 * (1 + Math.sqrt(5)))
    .round(false);
   
var svg = d3.select("#chart").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.bottom + margin.top)
    .style("margin-left", -margin.left + "px")
    .style("margin.right", -margin.right + "px")
    .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
     .style("shape-rendering", "crispEdges")  ;

var grandparent = svg.append("g")
    .attr("class", "grandparent");

grandparent.append("rect")
    .attr("y", -margin.top)
    .attr("width", width)
    .attr("height", margin.top);

grandparent.append("text")
    .attr("x", 6)
    .attr("y", 6 - margin.top)
    .attr("dy", ".75em");

// *** start of the replacement of the d3.json function with d3.csv code from Mark Fink. ***

// data is in the format of
// 		grandparent/parent/child, 102345

// first line of csv file contains:
//		filename,sloc

d3.csv("2013_nifa_non_formula_awards.csv", function(data) {
	  // convert csv data into flare.json format
	  function level(nodes) {
		return d3.nest()
		  .key(function(d) { 
			// console.log('key for: ' + JSON.stringify(d));
			if (d.filename.indexOf('/') === -1) return d.filename;
			else return d.filename.substr(0, d.filename.indexOf('/')); 
		  })
		  .rollup(function(v) {
			  // console.log('rollup: ' + JSON.stringify(v));
			  // leaf
			  if (v.length === 1 && v[0].filename.indexOf('/') === -1) {
				return {'value': parseInt(v[0].sloc)};
			  }
			  // node
			  v.map(function(d) { d.filename = d.filename.substring(d.filename.indexOf('/')+1); return d; });
			  return {'children': level(v)};
		  })
		  .entries(nodes)
		  .map(function(d) { 
			d.values['name'] = d.key;
			return d.values;
		  });
	  };

var root = {'name': 'ALL NON-FORMULA AWARDS', 'children': level(data)};
	  // console.log('root: ' + JSON.stringify(root));

initialize(root);
	  accumulate(root);
	  layout(root);
	  display(root);

function initialize(root) {
		root.x = root.y = 0;
		root.dx = width;
		root.dy = height;
		root.depth = 0;
  }

// *** end of replacement of the d3.json function with d3,csv

// Aggregate the values for internal nodes. This is normally done by the
  // treemap layout, but not here because of our custom implementation.
  // We also take a snapshot of the original children (_children) to avoid
  // the children being overwritten when when layout is computed.
  function accumulate(d) {
    return (d._children = d.children)
        ? d.value = d.children.reduce(function(p, v) { return p + accumulate(v); }, 0)
        : d.value;
  }

// Compute the treemap layout recursively such that each group of siblings
  // uses the same size (1×1) rather than the dimensions of the parent cell.
  // This optimizes the layout for the current zoom state. Note that a wrapper
  // object is created for the parent node for each group of siblings so that
  // the parent’s dimensions are not discarded as we recurse. Since each group
  // of sibling was laid out in 1×1, we must rescale to fit using absolute
  // coordinates. This lets us use a viewport to zoom.
  function layout(d) {
    if (d._children) {
      treemap.nodes({_children: d._children});
      d._children.forEach(function(c) {
        c.x = d.x + c.x * d.dx;
        c.y = d.y + c.y * d.dy;
        c.dx *= d.dx;
        c.dy *= d.dy;
        c.parent = d;
        layout(c);
      });
    }
  }

function display(d) {
    grandparent
        .datum(d.parent)
        .on("click", transition)
        .select("text")
        .text(name(d));
   
       var g1 = svg.insert("g", ".grandparent")
        .datum(d)
        .attr("class", "depth");

var g = g1.selectAll("g")
        .data(d._children)
      .enter().append("g");

g.filter(function(d) { return d._children; })
        .classed("children", true)
         .on("click", transition);

g.selectAll(".child")
        .data(function(d) { return d._children || [d]; })
      .enter().append("rect")
        .call(rect);

g.append("rect")
        .attr("class", "parent")
        .call(rect)
      .append("title")
         .text(function(d) { return "TITLE: " + d.name + "  $" + formatNumber(d.value); })
      // .text(function(d) { return formatNumber(d.value); });
        
// Modified by Owen Dall 2014-01-20 to add Dollars to the labels
    g.append("text")
        .attr("dy", ".75em")
         .text(function(d) { return d.name + "  ($" + formatNumber(d.value)+")"; }) // Modified by Owen Dall
        .call(text);

function transition(d) {
      if (transitioning || !d) return;
      transitioning = true;

var g2 = display(d),
          t1 = g1.transition().duration(750),
          t2 = g2.transition().duration(750);

// Update the domain only after entering new elements.
      x.domain([d.x, d.x + d.dx]);
      y.domain([d.y, d.y + d.dy]);

// Enable anti-aliasing during the transition.
      svg.style("shape-rendering", null);

// Draw child nodes on top of parent nodes.
      svg.selectAll(".depth").sort(function(a, b) { return a.depth - b.depth; });

// Fade-in entering text.
      g2.selectAll("text").style("fill-opacity", 0);

// Transition to the new view.
      t1.selectAll("text").call(text).style("fill-opacity", 0);
      t2.selectAll("text").call(text).style("fill-opacity", 1);
      t1.selectAll("rect").call(rect);
      t2.selectAll("rect").call(rect);

// Remove the old node when the transition is finished.
      t1.remove().each("end", function() {
        svg.style("shape-rendering", "crispEdges");
        transitioning = false;
      });
    }

return g;
  }

function text(text) {
    text.attr("x", function(d) { return x(d.x) + 6; })
        .attr("y", function(d) { return y(d.y) + 6; });
  }

function name(d) {
    return d.parent
        ? name(d.parent) + "." + d.name
        : d.name;
  }
  // Added by Owen Dall
 
			
});

</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js