taxonTree.js

$(document).ready(function() {
  // Get JSON data
  treeData = {
    "name": "Education, training and skills",
    "parents": [

    ],
    "children": [
      {
        "name": "School education from 5 to 18 years",
        "parents": [
          "Education, training and skills"
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            "name": "School curriculum, assessments and performance",
            "parents": [
              "School education from 5 to 18 years"
            ],
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              {
                "name": "Primary curriculum, key stage 1",
                "parents": [
                  "School curriculum, assessments and performance"
                ],
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                    "name": "Phonics",
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                      "Early years curriculum from birth to 5 years",
                      "Primary curriculum, key stage 1"
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                    "number_of_tagged_guidance_content": 54
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                  {
                    "name": "Assessments",
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                      "Primary curriculum, key stage 1"
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                  {
                    "name": "English",
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                    "name": "Maths",
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                    "name": "Science",
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                      "Primary curriculum, key stage 1"
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                    "number_of_tagged_guidance_content": 1
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                  {
                    "name": "Tests",
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                      "Primary curriculum, key stage 1"
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                    "number_of_tagged_guidance_content": 17
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              {
                "name": "Primary curriculum, key stage 2",
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                  "School curriculum, assessments and performance"
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                    "name": "Phonics",
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                      "Primary curriculum, key stage 2"
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                  {
                    "name": "Maths",
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                    "name": "Programmes of study",
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                    "name": "Science",
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                "name": "Secondary curriculum, key stage 3 and key stage 4",
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                "name": "Spiritual, moral, social and cultural development",
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                  "School curriculum, assessments and performance"
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                    "name": "Cultural education",
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                    "name": "Religious education",
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                    "name": "Promoting British values and citizenship in schools",
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                "name": "Personal, social, health and economic education",
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                    "name": "Sex and relationship education",
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                "name": "Physical education",
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                "name": "Copyright for schools",
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                "name": "Procurement for schools",
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                "name": "School buildings and premises",
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                "name": "Setting up or shutting down a school",
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                "name": "Changing the status of a school",
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                "name": "Dealing with complaints about a school",
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                  "Governing and managing schools"
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              {
                "name": "Whistleblowing in schools",
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                  "Governing and managing schools"
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                "number_of_tagged_guidance_content": 0
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              {
                "name": "School insurance and risk management",
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                  "Governing and managing schools"
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              {
                "name": "School governance",
                "parents": [
                  "Governing and managing schools"
                ],
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                    "name": "Governance partnerships for multiple schools",
                    "parents": [
                      "School governance"
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                  {
                    "name": "Pupil participation in school governance",
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                "name": "Recruiting and managing school staff",
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                "name": "Teacher training and professional development",
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                  "Teachers and school staff"
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                    "name": "Qualified Teacher Status (QTS)",
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                    "name": "Initial Teacher Training (ITT)",
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                    "name": "Subject Knowledge Enhancement (SKE)",
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                  {
                    "name": "National Professional Qualification for Headship (NPQH)",
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            "number_of_tagged_guidance_content": 0
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            "name": "Extra-curricular activities for schools",
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              "School education from 5 to 18 years"
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            "name": "School links with home, community and business",
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            "name": "Careers guidance in schools",
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                "name": "Access to education for minority groups",
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                "name": "Safeguarding pupils",
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                "number_of_tagged_guidance_content": 0
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            "name": "Alternatives to school",
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                "name": "Alternative provision and Pupil Referral Units",
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            "name": "School inspections",
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        "number_of_tagged_guidance_content": 10
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        "name": "Early years curriculum from birth to 5 years",
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          "Running a childcare business"
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              "Primary curriculum, key stage 1"
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        "number_of_tagged_content": 112,
        "number_of_tagged_guidance_content": 30
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        "name": "Funding and finance for education providers",
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            "name": "Funding and finance for schools",
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            "children": [
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                "name": "16 to 19 funding",
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          {
            "name": "Funding for special educational needs and disability support",
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            "number_of_tagged_guidance_content": 0
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        "number_of_tagged_guidance_content": 1
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        "name": "Further education, skills and vocational training",
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            "name": "Adult and community learning",
            "parents": [
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            "children": [
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                "name": "Basic skills education",
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            "number_of_tagged_content": 0,
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            "name": "Apprenticeships, traineeships and internships",
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            "name": "Inspection and performance of further education providers",
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            "number_of_tagged_guidance_content": 0
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        "number_of_tagged_guidance_content": 0
      },
      {
        "name": "University and higher education",
        "parents": [
          "Education, training and skills"
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        "children": [
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            "name": "Higher education courses and qualifications",
            "parents": [
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            "number_of_tagged_guidance_content": 0
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          {
            "name": "Governance and management for higher education institutions",
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            "number_of_tagged_guidance_content": 0
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        ],
        "number_of_tagged_content": 0,
        "number_of_tagged_guidance_content": 0
      },
      {
        "name": "Funding and finance for students",
        "parents": [
          "Education, training and skills"
        ],
        "children": [
          {
            "name": "Student loans",
            "parents": [
              "Funding and finance for students"
            ],
            "children": [

            ],
            "number_of_tagged_content": 0,
            "number_of_tagged_guidance_content": 0
          },
          {
            "name": "Student sponsorship",
            "parents": [
              "Funding and finance for students"
            ],
            "children": [

            ],
            "number_of_tagged_content": 0,
            "number_of_tagged_guidance_content": 0
          },
          {
            "name": "Financial help for students who are parents",
            "parents": [
              "Funding and finance for students"
            ],
            "children": [

            ],
            "number_of_tagged_content": 0,
            "number_of_tagged_guidance_content": 0
          },
          {
            "name": "Financial help for international students in the UK",
            "parents": [
              "Funding and finance for students"
            ],
            "children": [

            ],
            "number_of_tagged_content": 0,
            "number_of_tagged_guidance_content": 0
          }
        ],
        "number_of_tagged_content": 0,
        "number_of_tagged_guidance_content": 0
      },
      {
        "name": "Students with special needs, disabilities or disadvantages",
        "parents": [
          "Education, training and skills"
        ],
        "children": [
          {
            "name": "Able, gifted and talented pupils",
            "parents": [
              "Students with special needs, disabilities or disadvantages"
            ],
            "children": [

            ],
            "number_of_tagged_content": 0,
            "number_of_tagged_guidance_content": 0
          },
          {
            "name": "Special educational needs and disability support in schools",
            "parents": [
              "Students with special needs, disabilities or disadvantages"
            ],
            "children": [
              {
                "name": "Assessing pupils with special educational needs",
                "parents": [
                  "Special educational needs and disability support in schools"
                ],
                "children": [

                ],
                "number_of_tagged_content": 0,
                "number_of_tagged_guidance_content": 0
              },
              {
                "name": "SEND code of practice",
                "parents": [
                  "Special educational needs and disability support in schools"
                ],
                "children": [

                ],
                "number_of_tagged_content": 0,
                "number_of_tagged_guidance_content": 0
              }
            ],
            "number_of_tagged_content": 0,
            "number_of_tagged_guidance_content": 0
          },
          {
            "name": "Vulnerable and disadvantaged pupils",
            "parents": [
              "Students with special needs, disabilities or disadvantages"
            ],
            "children": [

            ],
            "number_of_tagged_content": 0,
            "number_of_tagged_guidance_content": 0
          },
          {
            "name": "Funding for special educational needs and disability",
            "parents": [
              "Students with special needs, disabilities or disadvantages"
            ],
            "children": [

            ],
            "number_of_tagged_content": 0,
            "number_of_tagged_guidance_content": 0
          }
        ],
        "number_of_tagged_content": 0,
        "number_of_tagged_guidance_content": 0
      },
      {
        "name": "Support for education work in other countries",
        "parents": [
          "Education, training and skills"
        ],
        "children": [

        ],
        "number_of_tagged_content": 0,
        "number_of_tagged_guidance_content": 0
      }
    ],
    "number_of_tagged_content": 29,
    "number_of_tagged_guidance_content": 0
  }

  // Calculate total nodes, max label length
  var totalNodes = 0;
  var maxLabelLength = 0;
  var maxNumberOfTaggedContent = 0;
  var taggedContentByDepth = [];
  var guidanceContentByDepth = [];
  // panning variables
  var panSpeed = 200;
  var panBoundary = 20; // Within 20px from edges will pan when dragging.
  // Misc. variables
  var i = 0;
  var duration = 750;
  var root;

  // Config
  // size of the diagram
  var viewerWidth = 1448; //$(document).width();
  var viewerHeight = 815; //$(document).height();
  var MAX_NODE_RADIUS = 20;
  var MIN_NODE_RADIUS = 4;
  var GENERATION_WIDTH = 500;

  var tree = d3.layout.tree()
      .size([viewerHeight, viewerWidth]);

  // define a d3 diagonal projection for use by the node paths later on.
  var diagonal = d3.svg.diagonal()
      .projection(function(d) {
          return [d.y, d.x];
      });

  // A recursive helper function for performing some setup by walking through all nodes

  function visit(parent, visitFn, depth) {
      if (!parent) return;

      depth = depth || 0;

      visitFn(parent, depth);

      var children = parent.children && parent.children.length ? parent.children : null;

      if (children) {
          var count = children.length;
          for (var i = 0; i < count; i++) {
              visit(children[i], visitFn, depth + 1);
          }
      }
  }

  visit(treeData, function(d, depth) {
      expand(d);
      totalNodes++;
      maxLabelLength = Math.max(d.name.length, maxLabelLength);

      if (d && d.number_of_tagged_content) {
          maxNumberOfTaggedContent = Math.max(maxNumberOfTaggedContent, d.number_of_tagged_content);
          taggedContentByDepth[depth] = taggedContentByDepth[depth] || 0;
          taggedContentByDepth[depth] += d.number_of_tagged_content;
      }

      if (d && d.number_of_tagged_guidance_content) {
        guidanceContentByDepth[depth] = guidanceContentByDepth[depth] || 0;
          guidanceContentByDepth[depth] += d.number_of_tagged_guidance_content;
      }
  });


  // sort the tree according to the node names

  function sortTree() {
      tree.sort(function(a, b) {
          return b.name.toLowerCase() < a.name.toLowerCase() ? 1 : -1;
      });
  }
  // Sort the tree initially incase the JSON isn't in a sorted order.
  sortTree();

  // TODO: Pan function, can be better implemented.

  function pan(domNode, direction) {
      var speed = panSpeed;
      if (panTimer) {
          clearTimeout(panTimer);
          translateCoords = d3.transform(svgGroup.attr("transform"));
          if (direction == 'left' || direction == 'right') {
              translateX = direction == 'left' ? translateCoords.translate[0] + speed : translateCoords.translate[0] - speed;
              translateY = translateCoords.translate[1];
          } else if (direction == 'up' || direction == 'down') {
              translateX = translateCoords.translate[0];
              translateY = direction == 'up' ? translateCoords.translate[1] + speed : translateCoords.translate[1] - speed;
          }
          scaleX = translateCoords.scale[0];
          scaleY = translateCoords.scale[1];
          scale = zoomListener.scale();
          svgGroup.transition().attr("transform", "translate(" + translateX + "," + translateY + ")scale(" + scale + ")");
          d3.select(domNode).select('g.node').attr("transform", "translate(" + translateX + "," + translateY + ")");
          zoomListener.scale(zoomListener.scale());
          zoomListener.translate([translateX, translateY]);
          panTimer = setTimeout(function() {
              pan(domNode, speed, direction);
          }, 50);
      }
  }

  // Define the zoom function for the zoomable tree

  function zoom() {
      svgGroup.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
  }


  // define the zoomListener which calls the zoom function on the "zoom" event constrained within the scaleExtents
  var zoomListener = d3.behavior.zoom().scaleExtent([0.1, 3]).on("zoom", zoom);

  // define the baseSvg, attaching a class for styling and the zoomListener
  var baseSvg = d3.select("#tree-container").append("svg")
      .attr("width", viewerWidth)
      .attr("height", viewerHeight)
      .attr("class", "overlay")
      .call(zoomListener);


  // Helper functions for collapsing and expanding nodes.

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

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

  var overCircle = function(d) {
      selectedNode = d;
      updateTempConnector();
  };
  var outCircle = function(d) {
      selectedNode = null;
      updateTempConnector();
  };

  // Function to center node when clicked/dropped so node doesn't get lost when collapsing/moving with large amount of children.

  function centerNode(source) {
      scale = zoomListener.scale();
      x = -source.y0;
      y = -source.x0;
      x = x * scale + viewerWidth / 2;
      y = y * scale + viewerHeight / 2;
      d3.select('g').transition()
          .duration(duration)
          .attr("transform", "translate(" + x + "," + y + ")scale(" + scale + ")");
      zoomListener.scale(scale);
      zoomListener.translate([x, y]);
  }

  // Toggle children function

  function toggleChildren(d) {
      if (d.children) {
          d._children = d.children;
          d.children = null;
      } else if (d._children) {
          d.children = d._children;
          d._children = null;
      }
      return d;
  }

  // Toggle children on click.

  function click(d) {
      if (d3.event.defaultPrevented) return; // click suppressed
      d = toggleChildren(d);
      update(d);
      centerNode(d);
  }

  function update(source) {
      // Compute the new height, function counts total children of root node and sets tree height accordingly.
      // This prevents the layout looking squashed when new nodes are made visible or looking sparse when nodes are removed
      // This makes the layout more consistent.
      var levelWidth = [1];
      var childCount = function(level, n) {

          if (n.children && n.children.length > 0) {
              if (levelWidth.length <= level + 1) levelWidth.push(0);

              levelWidth[level + 1] += n.children.length;
              n.children.forEach(function(d) {
                  childCount(level + 1, d);
              });
          }
      };
      childCount(0, root);
      var newHeight = d3.max(levelWidth) * 50; // 25 pixels per line
      tree = tree.size([newHeight, viewerWidth]);

      // Compute the new tree layout.
      var nodes = tree.nodes(root).reverse(),
          links = tree.links(nodes);

      updateTotalSummaries(nodes);

      // Set widths between levels based on maxLabelLength.
      nodes.forEach(function(d) {
          // d.y = (d.depth * (maxLabelLength * 16)); //maxLabelLength * 10px
          // alternatively to keep a fixed scale one can set a fixed depth per level
          // Normalize for fixed-depth by commenting out below line
          d.y = (d.depth * GENERATION_WIDTH);
      });

      // Update the nodes…
      node = svgGroup.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.y0 + "," + source.x0 + ")";
          })
          .on('click', click);

      nodeEnter.append("circle")
          .attr('class', 'nodeCircle')
          // Set the node radius depending on its number of content
          .attr("r", function (d) {
              var numberTagged = d.number_of_tagged_content || 0;
              return nodeRadius(numberTagged);
          });

      // Circle lying on top of the node, whose size is dependent on the number of guidance items
      nodeEnter.append("circle")
          .attr("class", "guidance-node")
          .attr("r", function(d) {
              var numberOfGuidance = d.number_of_tagged_guidance_content || 0;
              var radius = nodeRadius(numberOfGuidance);
              return radius == MIN_NODE_RADIUS
                  ? 0 // If it's the minimum radius, there's 0 guidance, so hide it
                  : radius;
          })
          .style("fill", "red");

      nodeEnter.append("text")
          .attr("dy", ".35em")
          .attr('class', 'nodeText')
          .attr("text-anchor", function(d) {
              return d.children || d._children ? "end" : "start";
          })
          .text(function(d) {
              return d.name;
          })
          .style("fill-opacity", 0);

      // phantom node to give us mouseover in a radius around it
      nodeEnter.append("circle")
          .attr('class', 'ghostCircle')
          .attr("r", 30)
          .attr("opacity", 0.2) // change this to zero to hide the target area
      .style("fill", "red")
          .attr('pointer-events', 'mouseover')
          .on("mouseover", function(node) {
              overCircle(node);
          })
          .on("mouseout", function(node) {
              outCircle(node);
          });

      // Update the text to reflect whether node has children or not.
      node.select('text')
          .attr("x", function(d) {
              return MAX_NODE_RADIUS + 5;
          })
          .attr("text-anchor", function(d) {
              return "start";
          })
          .text(function(d) {
              return d.name+" ("+d.number_of_tagged_content+" / "+d.number_of_tagged_guidance_content+")";
          });

      node.select("circle.nodeCircle")
          // Change the circle fill depending on whether it has children and is collapsed.
          .style("fill", function(d) {
              return d._children ? "lightsteelblue" : "#fff";
          });

      // Transition nodes to their new position.
      var nodeUpdate = node.transition()
          .duration(duration)
          .attr("transform", function(d) {
              return "translate(" + d.y + "," + d.x + ")";
          });

      // Fade the text in
      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.y + "," + source.x + ")";
          })
          .remove();

      nodeExit.select("circle")
          .attr("r", 0);

      nodeExit.select("text")
          .style("fill-opacity", 0);

      // Update the links…
      var link = svgGroup.selectAll("path.link")
          .data(links, function(d) {
              return d.target.id;
          });

      // Enter any new links at the parent's previous position.
      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;
      });
  }

  function nodeRadius(numberOfTaggedContent) {
    return MIN_NODE_RADIUS + (MAX_NODE_RADIUS - MIN_NODE_RADIUS) * numberOfTaggedContent / maxNumberOfTaggedContent;
  }

  function updateTotalSummaries(displayedNodes) {
    // Only display summaries for the displayed levels of the tree
    var maxDepthToShow = 0;
    displayedNodes.forEach(function (node) {
      maxDepthToShow = Math.max(maxDepthToShow, node.depth);
    });

    // Remove the summaries and re-add them
    svgGroup.selectAll("text.total-summary").remove();

    for (var depth = 0; depth <= maxDepthToShow; depth++) {
        taggedContentByDepth[depth] = taggedContentByDepth[depth] || 0;
        guidanceContentByDepth[depth] = guidanceContentByDepth[depth] || 0;

        svgGroup.append("text")
            .attr("class", "total-summary")
            .text("(" + taggedContentByDepth[depth] + " / " + guidanceContentByDepth[depth] + ")")
            .attr("x", GENERATION_WIDTH * depth + MAX_NODE_RADIUS + 10);
    }
  }

  // Append a group which holds all nodes and which the zoom Listener can act upon.
  var svgGroup = baseSvg.append("g");

  // Define the root
  root = treeData;
  root.x0 = viewerHeight / 2;
  root.y0 = 0;

  // Layout the tree initially and center on the root node.
  update(root);
  centerNode(root);
});