Creating Vertical Collapsible Tree With d3.js

• See demo here

Introduction

Let's make a vertical collapsible tree using d3.js.

Styles

<style>
        .node {
            cursor: pointer;
        }

            .node circle {
                stroke-width: 3px;
            }

            .node text {
                font: 12px sans-serif;
                fill: #fff;
            }

        .link {
            fill: none;
            stroke: #ccc;
            stroke-width: 2px;
        }

        .tree {
            margin-bottom: 10px;
            overflow: auto;
        }
    </style>

HTML

  <script src="Scripts/jquery-1.8.2.js"></script>
   <script src="http://d3js.org/d3.v3.min.js"></script>

   <div id="tree">

    </div>

JS

  $(document).ready(function () {
            //build tree
            function BuildVerticaLTree(treeData, treeContainerDom) {
                var margin = { top: 40, right: 120, bottom: 20, left: 120 };
                var width = 960 - margin.right - margin.left;
                var height = 500 - margin.top - margin.bottom;

                var i = 0, duration = 750;
                var tree = d3.layout.tree()
                    .size([height, width]);
                var diagonal = d3.svg.diagonal()
                    .projection(function (d) { return [d.x, d.y]; });
                var svg = d3.select(treeContainerDom).append("svg")
                    .attr("width", width + margin.right + margin.left)
                    .attr("height", height + margin.top + margin.bottom)
                  .append("g")
                    .attr("transform", "translate
                    (" + margin.left + "," + margin.top + ")");
                root = treeData;

                update(root);
                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 * 100; });
                    // Declare the nodes…
                    var node = svg.selectAll("g.node")
                        .data(nodes, function (d) { return d.id || (d.id = ++i); });
                    // Enter the nodes.
                    var nodeEnter = node.enter().append("g")
                        .attr("class", "node")
                        .attr("transform", function (d) {
                            return "translate(" + source.x0 + "," + source.y0 + ")";
                        }).on("click", nodeclick);
                    nodeEnter.append("circle")
                     .attr("r", 10)
                        .attr("stroke", function (d) 
                        { return d.children || d._children ? 
                        "steelblue" : "#00c13f"; })
                        .style("fill", function (d) 
                        { return d.children || d._children ? 
                        "lightsteelblue" : "#fff"; });
                    //.attr("r", 10)
                    //.style("fill", "#fff");
                    nodeEnter.append("text")
                        .attr("y", function (d) {
                            return d.children || d._children ? -18 : 18;
                        })
                        .attr("dy", ".35em")
                        .attr("text-anchor", "middle")
                        .text(function (d) { return d.name; })
                        .style("fill-opacity", 1e-6);
                    // Transition nodes to their new position.
                    //horizontal tree
                    var nodeUpdate = node.transition()
                        .duration(duration)
                        .attr("transform", function (d) 
                        { return "translate(" + d.x + 
                        "," + d.y + ")"; });
                    nodeUpdate.select("circle")
                        .attr("r", 10)
                        .style("fill", function (d) 
                        { return d._children ? "lightsteelblue" : "#fff"; });
                    nodeUpdate.select("text")
                        .style("fill-opacity", 1);

                    // Transition exiting nodes to the parent's new position.
                    var nodeExit = node.exit().transition()
                        .duration(duration)
                        .attr("transform", function (d) 
                        { return "translate(" + source.x + 
                        "," + source.y + ")"; })
                        .remove();
                    nodeExit.select("circle")
                        .attr("r", 1e-6);
                    nodeExit.select("text")
                        .style("fill-opacity", 1e-6);
                    // Update the links…
                    // Declare the links…
                    var link = svg.selectAll("path.link")
                        .data(links, function (d) { return d.target.id; });
                    // Enter the links.
                    link.enter().insert("path", "g")
                        .attr("class", "link")

                        .attr("d", function (d) {
                            var o = { x: source.x0, y: source.y0 };
                            return diagonal({ source: o, target: o });
                        });
                    // Transition links to their new position.
                    link.transition()
                        .duration(duration)
                    .attr("d", diagonal);

                    // Transition exiting nodes to the parent's new position.
                    link.exit().transition()
                        .duration(duration)
                        .attr("d", function (d) {
                            var o = { x: source.x, y: source.y };
                            return diagonal({ source: o, target: o });
                        })
                        .remove();

                    // Stash the old positions for transition.
                    nodes.forEach(function (d) {
                        d.x0 = d.x;
                        d.y0 = d.y;
                    });
                }

                // Toggle children on click.
                function nodeclick(d) {
                    if (d.children) {
                        d._children = d.children;
                        d.children = null;
                    } else {
                        d.children = d._children;
                        d._children = null;
                    }
                    update(d);
                }
            }

            var treeData =
        {
            "name": "Top Level",
            "parent": "null",
            "children": [
              {
                  "name": "Level 2: A",
                  "parent": "Top Level",
                  "children": [
                    {
                        "name": "Son of A",
                        "parent": "Level 2: A",
                         "children": []
                    },
                    {
                        "name": "Daughter of A",
                        "parent": "Level 2: A",
                        "children": []
                    }
                  ]
              },
              {
                  "name": "Level 2: B",
                  "parent": "Top Level",
                  "children": []
              }
            ]
        };
            BuildVerticaLTree(treeData, "#tree");
        });

Output