Tree Chart - D3js

Foldable D3js tree chart.

by Gabriel Z

HTML

<div id=tree></div>

CSS

html{
    font: 10px sans-serif;
}

svg{
    border: 1px solid silver;
}

.node{
    cursor: pointer;
}

.node circle{
    stroke: steelblue;
    stroke-width: 1.5px;
}

.link{
    fill: none;
    stroke: lightgray;
    stroke-width: 1.5px;
}

JavaScript

var json = 
{
    "name": "Base",
    "children": [
        {
            "name": "Type A",
            "children": [
                {
                    "name": "Section 1",
                    "children": [
                        {"name": "Child 1"},
                        {"name": "Child 2"},
                        {"name": "Child 3"}
                    ]
                },
                {
                    "name": "Section 2",
                    "children": [
                        {"name": "Child 1"},
                        {"name": "Child 2"},
                        {"name": "Child 3"}
                    ]
                }
            ]
        },
        {
            "name": "Type B",
            "children": [
                {
                    "name": "Section 1",
                    "children": [
                        {"name": "Child 1"},
                        {"name": "Child 2"},
                        {"name": "Child 3"}
                    ]
                },
                {
                    "name": "Section 2",
                    "children": [
                        {"name": "Child 1"},
                        {"name": "Child 2"},
                        {"name": "Child 3"}
                    ]
                }
            ]
        }
    ]
};

var width = 700;
var height = 650;
var maxLabel = 150;
var duration = 500;
var radius = 5;
    
var i = 0;
var root;

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

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

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
        .append("g")
        .attr("transform", "translate(" + maxLabel + ",0)");

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

root.children.forEach(collapse);

function update(source) 
{
    // Compute the new tree layout.
    var nodes = tree.nodes(root).reverse();
    var links = tree.links(nodes);

    // Normalize...