Zoomable Treemap of the Chicago Data Portal

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

<style>

#chart {
			width: 820px;
			height: 700px;
			background: #bbb;
			margin: 1px auto;
			position: relative;
			-webkit-box-sizing: border-box;
				-moz-box-sizing: border-box;
					box-sizing: border-box;
		}

text {
			pointer-events: none;
		}

.grandparent text { /* header text */
			font-weight: bold;
			font-size: medium;
			font-family: "Open Sans", Helvetica, Arial, sans-serif; 
		}

rect {
			fill: none;
			stroke: #fff;
		}

rect.parent,
		.grandparent rect {
			stroke-width: 2px;
		}

.grandparent rect {
			fill: #fff;
		}

.children rect.parent,
		.grandparent rect {
			cursor: pointer;
		}

rect.parent {
			pointer-events: all; 
		}

.children:hover rect.child,
		.grandparent:hover rect {
			fill: #aaa;
		}

.textdiv { /* text in the boxes */
			font-size: x-small;
			padding: 5px;
			font-family: "Open Sans", Helvetica, Arial, sans-serif; 
		}

</style>

var margin = {top: 20, right: 0, bottom: 0, left: 0},
	width = 820,
	height = 700 - margin.top - margin.bottom,
	formatNumber = d3.format(",d"),
	transitioning;

/* create x and y scales */
	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);

/* create svg */
	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 color = d3.scale.category20c();

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");

/* load in data, display root */
	d3.json("portaldata.json", function(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;
		}

// Aggregate the values for internal nodes. This is normally done by the
		// treemap layout, but not here because of the custom implementation.
		function accumulate(d) {
			return 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);
			});
			}
		}

/* display shows the treemap and writes the embedded transition function */
		function display(d) {
			/* create grandparent bar at top */
			grandparent
				.datum(d.parent)
				.on("click", transition)
				.select("text")
				.text(name(d));

var g1 = svg.insert("g", ".grandparent")
				.datum(d)
				.attr("class", "depth");

/* add in data */
			var g = g1.selectAll("g")
				.data(d.children)
				.enter().append("g");

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

/* write children rectangles */
			g.selectAll(".child")
				.data(function(d) { return d.children || [d]; })
				.enter().append("rect")
				   .attr("class", "child")
				   .call(rect)
				   .append("title")
				   .text(function(d) { return d.name + " " + formatNumber(d.size); });

/* write parent rectangle */
			g.append("rect")
				.attr("class", "parent")
				.call(rect)
				/* open new window based on the json's URL value for leaf nodes */
				/* Chrome displays this on top */
				.on("click", function(d) { 
					if(!d.children){
						window.open(d.url); 
					}
				})
				.append("title")
				.text(function(d) { return d.name + " " + formatNumber(d.size); }); /*should be d.value*/

/* Adding a foreign object instead of a text object, allows for text wrapping */
			g.append("foreignObject")
				.call(rect)
				/* open new window based on the json's URL value for leaf nodes */
				/* Firefox displays this on top */
				.on("click", function(d) { 
					if(!d.children){
						window.open(d.url); 
				}
			})
				.attr("class","foreignobj")
				.append("xhtml:div") 
				.attr("dy", ".75em")
				.html(function(d) { return d.name; 
				})
				.attr("class","textdiv"); //textdiv class allows us to style the text easily with CSS

/* create transition function for transitions */
			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);
				g2.selectAll("foreignObject div").style("display", "none"); /*added*/

// 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);

t1.selectAll(".textdiv").style("display", "none"); /* added */
				t1.selectAll(".foreignobj").call(foreign); /* added */
				t2.selectAll(".textdiv").style("display", "block"); /* added */
				t2.selectAll(".foreignobj").call(foreign); /* added */

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

}//endfunc transition

return g;
		}//endfunc display

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;
			}
		});

</script>

Modified http://d3js.org/d3.v2.js to a secure url

Modified http://code.jquery.com/jquery-1.7.1.js to a secure url

https://d3js.org/d3.v2.js

https://code.jquery.com/jquery-1.7.1.js