C2Task1ToyDendrogram

HTML

<div id="content"></div>

CSS

.node circle {
    fill: #fff;
    stroke: steelblue;
    stroke-width: 1.5px;
}
.node {
    font: 10px sans-serif;
}
.link {
    fill: none;
    stroke: #ccc;
    stroke-width: 1.5px;
}
#content {
    padding: 50px;
}

JavaScript

var tree_data = {
    "name": "root",
        "children": [{
        "name": "purpledog.com"
    }, {
        "name": "squishedfish.co.uk"
    }, {
        "name": "blogs",
            "children": [{
            "name": "political",
                "children": [{
                "name": "flatbat.com"
            }, {
                "name": "netfrog.co.uk"
            }]

        }, {
            "name": "squarespider.com"
        }
        ]
    }]
};

var width = 500,
    height = 500;

var svg = d3.select("#content").append("svg")
    .attr("width", width)
    .attr("height", height)
    .append("g")
    .attr("transform", "translate(40,0)");

var cluster = d3.layout.tree()
    .size([height, width - 160]);

var nodes = cluster.nodes(tree_data),
    links = cluster.links(nodes);

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


var link = svg.selectAll(".link")
    .data(links)
    .enter().append("path")
    .attr("class", "link")
    .attr("d", diagonal);

var node = svg.selectAll(".node")
    .data(nodes)
    .enter().append("g")
    .attr("class", "node")
    .attr("transform", function (d) {
    return "translate(" + d.y + "," + d.x + ")";
})

node.append("rect")
    .attr("width", "80")
    .attr("height", "80")
    .attr("style", "fill:red;stroke:black;stroke-width:5;opacity:0.5");

node.append("text")
    .attr("dx", function (d) {
    return d.children ? -8 : 8;
})
    .attr("dy", 3)
    .style("text-anchor", function (d) {
    return d.children ? "end" : "start";
})
    .text(function (d) {
    return d.name;
});