text: /* ------------------------------------------------------------------------------
   *
   *  # D3.js - basic tree layout
   *
   *  Demo of tree layout setup with .json data source
   *
   * ---------------------------------------------------------------------------- */
  
  
  // Setup module
  // ------------------------------
  
  var D3TreeBasic = function() {
  
  
      //
      // Setup module components
      //
  
      // Chart
      var _treeBasic = function() {
          if (typeof d3 == 'undefined') {
              console.warn('Warning - d3.min.js is not loaded.');
              return;
          }
  
          // Main variables
          var element = document.getElementById('d3-tree-basic'),
              height = 800;
  
  
          // Initialize chart only if element exsists in the DOM
          if(element) {
  
              // Basic setup
              // ------------------------------
  
              // Define main variables
              var d3Container = d3.select(element),
                  margin = {top: 0, right: 0, bottom: 0, left: 40},
                  width = d3Container.node().getBoundingClientRect().width - margin.left - margin.right,
                  height = height - margin.top - margin.bottom - 5;
  
              // Colors
              var color = '#2196F3';
  
  
  
              // Create chart
              // ------------------------------
  
              // Add SVG element
              var container = d3Container.append("svg");
  
              // Add SVG group
              var svg = container
                  .attr("width", width + margin.left + margin.right)
                  .attr("height", height + margin.top + margin.bottom)
                  .append("g")
                      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
  
  
  
              // Construct chart layout
              // ------------------------------
  
              // Tree
              var tree = d3.layout.tree()
                  .size([height, width - 180]);
  
              // Diagonal projection
              var diagonal = d3.svg.diagonal()
                  .projection(function(d) { return [d.y, d.x]; });
  
  
  
              // Load data
              // ------------------------------
  
              d3.json("../../../../global_assets/demo_data/d3/tree/tree_data_basic.json", function(error, json) {
  
                  var nodes = tree.nodes(json),
                      links = tree.links(nodes);
  
  
                  // Links
                  // ------------------------------
  
                  // Append link group
                  var linkGroup = svg.append("g")
                      .attr("class", "d3-tree-link-group");
  
                  // Append link path
                  var link = linkGroup.selectAll(".d3-tree-link")
                      .data(links)
                      .enter()
                      .append("path")
                          .attr("class", "d3-tree-link d3-line-connect")
                          .style("stroke-width", 1.5)
                          .attr("d", diagonal);
  
  
                  // Nodes
                  // ------------------------------
  
                  // Append node group
                  var nodeGroup = svg.append("g")
                      .attr("class", "d3-tree-node-group");
  
                  // Append node
                  var node = nodeGroup.selectAll(".d3-tree-node")
                      .data(nodes)
                      .enter()
                      .append("g")
                          .attr("class", "d3-tree-node")
                          .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });
  
                  // Append node circles
                  node.append("circle")
                      .attr("r", 4.5)
                      .attr("class", "d3-tree-circle d3-line-circle")
                      .style("stroke", color)
                      .style("stroke-width", 1.5);
  
                  // Append node text
                  node.append("text")
                      .attr("class", "d3-text")
                      .attr("dx", function(d) { return d.children ? -12 : 12; })
                      .attr("dy", 4)
                      .style("text-anchor", function(d) { return d.children ? "end" : "start"; })
                      .style("font-size", 12)
                      .text(function(d) { return d.name; });
  
  
  
                  // Resize chart
                  // ------------------------------
  
                  // Call function on window resize
                  window.addEventListener('resize', resize);
  
                  // Call function on sidebar width change
              var sidebarToggle = document.querySelectorAll('.sidebar-control');
              if (sidebarToggle) {
                  sidebarToggle.forEach(function(togglers) {
                      togglers.addEventListener('click', resize);
                  });
              }
  
  
                  // Resize function
                  // 
                  // Since D3 doesn't support SVG resize by default,
                  // we need to manually specify parts of the graph that need to 
                  // be updated on window resize
                  function resize() {
  
                      // Layout variables
                      width = d3Container.node().getBoundingClientRect().width - margin.left - margin.right,
                      nodes = tree.nodes(json),
                      links = tree.links(nodes);
  
                      // Layout
                      // -------------------------
  
                      // Main svg width
                      container.attr("width", width + margin.left + margin.right);
  
                      // Width of appended group
                      svg.attr("width", width + margin.left + margin.right);
  
  
                      // Tree size
                      tree.size([height, width - 180]);
  
  
                      // Chart elements
                      // -------------------------
  
                      // Link paths
                      svg.selectAll(".d3-tree-link").attr("d", diagonal)
  
                      // Node paths
                      svg.selectAll(".d3-tree-node").attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });
                  }
              });
          }
      };
  
  
      //
      // Return objects assigned to module
      //
  
      return {
          init: function() {
              _treeBasic();
          }
      }
  }();
  
  
  // Initialize module
  // ------------------------------
  
  document.addEventListener('DOMContentLoaded', function() {
      D3TreeBasic.init();
  });
  