D3.js TreeLayout with Boxes

D3.js with Rectangles appended as well as text. Using nodeSize, we can specify how big the rectangles are and make the TreeLayout separate accordingly.

HTML

<div id="body"></div>

CSS

.node {
    cursor: pointer;
}
.node circle {
    fill: #fff;
    stroke: steelblue;
    stroke-width: 1.5px;
}
.node text {
    font: 10px sans-serif;
}
.link {
    fill: none;
    stroke: #ccc;
    stroke-width: 1.5px;
}

body {
    overflow: hidden;
}

JavaScript

function loadtree(){
var margin = {
    top: 20,
    right: 120,
    bottom: 20,
    left: 120
},
width = 960 - margin.right - margin.left,
height = 800 - margin.top - margin.bottom;

var root;
    
d3.json("http://www.billdwhite.com/wordpress/wp-content/data/flare.json", function(data) {
    root = data;

    var i = 0,
    duration = 750,
    rectW = 60,
    rectH = 30;

var tree = d3.layout.tree().nodeSize([70, 40]);
var diagonal = d3.svg.diagonal()
    .projection(function (d) {
    return [d.x + rectW / 2, d.y + rectH / 2];
});

var svg = d3.select("#body").append("svg").attr("width", 1000).attr("height", 1000)
    .call(zm = d3.behavior.zoom().scaleExtent([1,3]).on("zoom", redraw)).append("g")
    .attr("transform", "translate(" + 350 + "," + 20 + ")");

//necessary so that zoom knows where to zoom and unzoom from
zm.translate([350, 20]);

root.x0 = 0;
root.y0 = height / 2;

function collapse(d) {
    if (d.children) {
        d._children = d.children;
        d._children.forEach(collapse);
        d.children = null;
    }
}

root.children.forEach(collapse);
update(root);

d3.select("#body").style("height", "800px");

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.x0 + "," + source.y0 + ")";
    })
        .on("click", click);

    nodeEnter.append("rect")
        .attr("width", rectW)
        .attr("height", rectH)
        .attr("stroke", "black")
        .attr("stroke-width", 1)
        .style("fill",...