taxonTree.js

$(document).ready(function() {
  // Get JSON data
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  "parents": [

  ],
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        "Education, training and skills"
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            "School curriculum"
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                "Primary curriculum, key stage 1"
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              "number_of_tagged_guidance_content": 0
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              "name": "Maths",
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                "Primary curriculum, key stage 2"
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          "number_of_tagged_guidance_content": 16
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          "name": "School performance tables and Ofsted reports",
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          "name": "Inspection of British schools overseas",
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      "name": "Education and funding for high needs, special educational needs and disability (SEND)",
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          "name": "Special educational needs and disability (SEND) code of practice",
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          "children": [

          ],
          "number_of_tagged_content": 22,
          "number_of_tagged_guidance_content": 14
        },
        {
          "name": "Funding for special educational needs and disability (SEND)",
          "parents": [
            "Education and funding for high needs, special educational needs and disability (SEND)"
          ],
          "children": [

          ],
          "number_of_tagged_content": 38,
          "number_of_tagged_guidance_content": 12
        },
        {
          "name": "High needs funding",
          "parents": [
            "Education and funding for high needs, special educational needs and disability (SEND)"
          ],
          "children": [

          ],
          "number_of_tagged_content": 47,
          "number_of_tagged_guidance_content": 37
        },
        {
          "name": "Special educational needs and disability (SEND) support in education",
          "parents": [
            "Education and funding for high needs, special educational needs and disability (SEND)"
          ],
          "children": [

          ],
          "number_of_tagged_content": 50,
          "number_of_tagged_guidance_content": 12
        }
      ],
      "number_of_tagged_content": 110,
      "number_of_tagged_guidance_content": 6
    },
    {
      "name": "School and academy funding and provision",
      "parents": [
        "Education, training and skills"
      ],
      "children": [
        {
          "name": "Local authority schools funding",
          "parents": [
            "School and academy funding and provision"
          ],
          "children": [

          ],
          "number_of_tagged_content": 55,
          "number_of_tagged_guidance_content": 25
        },
        {
          "name": "Pupil premium and other school premiums ",
          "parents": [
            "School and academy funding and provision"
          ],
          "children": [

          ],
          "number_of_tagged_content": 54,
          "number_of_tagged_guidance_content": 26
        },
        {
          "name": "Funding for different types of schools and settings",
          "parents": [
            "School and academy funding and provision"
          ],
          "children": [
            {
              "name": "Alternative provision funding",
              "parents": [
                "Funding for different types of schools and settings"
              ],
              "children": [

              ],
              "number_of_tagged_content": 7,
              "number_of_tagged_guidance_content": 3
            },
            {
              "name": "Faith schools funding",
              "parents": [
                "Funding for different types of schools and settings"
              ],
              "children": [

              ],
              "number_of_tagged_content": 6,
              "number_of_tagged_guidance_content": 0
            },
            {
              "name": "Special schools funding",
              "parents": [
                "Funding for different types of schools and settings"
              ],
              "children": [

              ],
              "number_of_tagged_content": 9,
              "number_of_tagged_guidance_content": 7
            },
            {
              "name": "Academy funding",
              "parents": [
                "Funding for different types of schools and settings"
              ],
              "children": [

              ],
              "number_of_tagged_content": 75,
              "number_of_tagged_guidance_content": 49
            },
            {
              "name": "Early years funding",
              "parents": [
                "Funding for different types of schools and settings"
              ],
              "children": [

              ],
              "number_of_tagged_content": 41,
              "number_of_tagged_guidance_content": 23
            },
            {
              "name": "Funding for 16 to 19 year olds in schools",
              "parents": [
                "Funding for different types of schools and settings"
              ],
              "children": [

              ],
              "number_of_tagged_content": 44,
              "number_of_tagged_guidance_content": 32
            }
          ],
          "number_of_tagged_content": 28,
          "number_of_tagged_guidance_content": 13
        },
        {
          "name": "Schools forums",
          "parents": [
            "School and academy funding and provision"
          ],
          "children": [

          ],
          "number_of_tagged_content": 4,
          "number_of_tagged_guidance_content": 2
        },
        {
          "name": "Funding for school buildings and land",
          "parents": [
            "School and academy funding and provision"
          ],
          "children": [

          ],
          "number_of_tagged_content": 95,
          "number_of_tagged_guidance_content": 39
        },
        {
          "name": "Initial Teacher Training funding",
          "parents": [
            "School and academy funding and provision"
          ],
          "children": [

          ],
          "number_of_tagged_content": 21,
          "number_of_tagged_guidance_content": 21
        },
        {
          "name": "School places and capacity",
          "parents": [
            "School and academy funding and provision"
          ],
          "children": [

          ],
          "number_of_tagged_content": 88,
          "number_of_tagged_guidance_content": 7
        },
        {
          "name": "School Direct funding",
          "parents": [
            "School and academy funding and provision"
          ],
          "children": [

          ],
          "number_of_tagged_content": 13,
          "number_of_tagged_guidance_content": 11
        },
        {
          "name": "Free school meals (FSM) funding ",
          "parents": [
            "School and academy funding and provision"
          ],
          "children": [

          ],
          "number_of_tagged_content": 14,
          "number_of_tagged_guidance_content": 8
        }
      ],
      "number_of_tagged_content": 141,
      "number_of_tagged_guidance_content": 26
    },
    {
      "name": "Teaching and leadership",
      "parents": [
        "Education, training and skills"
      ],
      "children": [
        {
          "name": "Teacher training and professional development",
          "parents": [
            "Teaching and leadership"
          ],
          "children": [
            {
              "name": "Initial Teacher Training (ITT)",
              "parents": [
                "Teacher training and professional development"
              ],
              "children": [

              ],
              "number_of_tagged_content": 118,
              "number_of_tagged_guidance_content": 38
            },
            {
              "name": "Teacher training providers",
              "parents": [
                "Teacher training and professional development"
              ],
              "children": [

              ],
              "number_of_tagged_content": 33,
              "number_of_tagged_guidance_content": 14
            },
            {
              "name": "School leadership",
              "parents": [
                "Teacher training and professional development"
              ],
              "children": [

              ],
              "number_of_tagged_content": 71,
              "number_of_tagged_guidance_content": 1
            },
            {
              "name": "National Professional Qualification for Headship (NPQH)",
              "parents": [
                "Teacher training and professional development"
              ],
              "children": [

              ],
              "number_of_tagged_content": 2,
              "number_of_tagged_guidance_content": 2
            },
            {
              "name": "Qualified Teacher Status (QTS)",
              "parents": [
                "Teacher training and professional development"
              ],
              "children": [

              ],
              "number_of_tagged_content": 10,
              "number_of_tagged_guidance_content": 4
            },
            {
              "name": "Subject Knowledge Enhancement (SKE)",
              "parents": [
                "Teacher training and professional development"
              ],
              "children": [

              ],
              "number_of_tagged_content": 20,
              "number_of_tagged_guidance_content": 10
            }
          ],
          "number_of_tagged_content": 120,
          "number_of_tagged_guidance_content": 29
        },
        {
          "name": "Recruiting and managing teachers",
          "parents": [
            "Teaching and leadership"
          ],
          "children": [

          ],
          "number_of_tagged_content": 45,
          "number_of_tagged_guidance_content": 20
        },
        {
          "name": "Teacher pay, pensions and conditions",
          "parents": [
            "Teaching and leadership"
          ],
          "children": [

          ],
          "number_of_tagged_content": 90,
          "number_of_tagged_guidance_content": 6
        },
        {
          "name": "Teacher records",
          "parents": [
            "Teaching and leadership"
          ],
          "children": [

          ],
          "number_of_tagged_content": 2,
          "number_of_tagged_guidance_content": 2
        },
        {
          "name": "Teaching standards, misconduct and practice",
          "parents": [
            "Teaching and leadership"
          ],
          "children": [

          ],
          "number_of_tagged_content": 630,
          "number_of_tagged_guidance_content": 19
        }
      ],
      "number_of_tagged_content": 64,
      "number_of_tagged_guidance_content": 0
    },
    {
      "name": "Funding and finance for students",
      "parents": [
        "Education, training and skills"
      ],
      "children": [
        {
          "name": "Financial help for students who are parents or carers",
          "parents": [
            "Funding and finance for students"
          ],
          "children": [

          ],
          "number_of_tagged_content": 7,
          "number_of_tagged_guidance_content": 6
        },
        {
          "name": "Student loans, bursaries, and sponsorship",
          "parents": [
            "Funding and finance for students"
          ],
          "children": [

          ],
          "number_of_tagged_content": 32,
          "number_of_tagged_guidance_content": 24
        },
        {
          "name": "Financial help for international students in the UK",
          "parents": [
            "Funding and finance for students"
          ],
          "children": [

          ],
          "number_of_tagged_content": 2,
          "number_of_tagged_guidance_content": 0
        }
      ],
      "number_of_tagged_content": 7,
      "number_of_tagged_guidance_content": 7
    },
    {
      "name": "School and academy financial management and assurance",
      "parents": [
        "Education, training and skills"
      ],
      "children": [
        {
          "name": "Financial management, reporting and assurances for 16 to 19 year olds funding",
          "parents": [
            "School and academy financial management and assurance"
          ],
          "children": [

          ],
          "number_of_tagged_content": 29,
          "number_of_tagged_guidance_content": 20
        },
        {
          "name": "Academy and academy trust finance and reporting",
          "parents": [
            "School and academy financial management and assurance"
          ],
          "children": [

          ],
          "number_of_tagged_content": 81,
          "number_of_tagged_guidance_content": 52
        },
        {
          "name": "School procurement",
          "parents": [
            "School and academy financial management and assurance"
          ],
          "children": [

          ],
          "number_of_tagged_content": 27,
          "number_of_tagged_guidance_content": 22
        },
        {
          "name": "Local authority schools financial reporting and assurance",
          "parents": [
            "School and academy financial management and assurance"
          ],
          "children": [

          ],
          "number_of_tagged_content": 46,
          "number_of_tagged_guidance_content": 29
        },
        {
          "name": "School insurance and risk management",
          "parents": [
            "School and academy financial management and assurance"
          ],
          "children": [

          ],
          "number_of_tagged_content": 6,
          "number_of_tagged_guidance_content": 4
        }
      ],
      "number_of_tagged_content": 13,
      "number_of_tagged_guidance_content": 1
    },
    {
      "name": "Education of disadvantaged children",
      "parents": [
        "Education, training and skills"
      ],
      "children": [

      ],
      "number_of_tagged_content": 63,
      "number_of_tagged_guidance_content": 5
    }
  ],
  "number_of_tagged_content": 132,
  "number_of_tagged_guidance_content": 3
}

  // 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 = $(document).width(); // 1448;
  var viewerHeight = $(document).height(); // 815;
  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);
});