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