D3 Examples - BIO140/150: Collapsible Tree

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.node {
  cursor: pointer;
}
​
.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 1.5px;
}
​
.node text {
  font: 10px sans-serif;
}
​
.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 1.5px;
}
​
</style>
​
<header>
    <button onclick="expandAll()">Expand All</button>
    <button onclick="collapseAll()">Collapse All</button>
  </header>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
​
var margin = {top: 20, right: 120, bottom: 20, left: 120},
    width = 1500,
    height =  2000;
  
function expand(d){   
    var children = (d.children)?d.children:d._children;
    if (d._children) {        
        d.children = d._children;
        d._children = null;       
    }
    if(children)
      children.forEach(expand);
}
  
  function expandAll(){
    tree.size([height, width])
    expand(root); 
    update(root);
    }
​
  function collapseAll(){
      tree.size([height/4, width])
        root.children.forEach(collapse);
      collapse(root);
      update(root);
  }
  
  function collapse(d) {
    if (d.children) {
      d._children = d.children;
      d._children.forEach(collapse);
      d.children = null;
    }
  }
​
var i = 0,
    duration = 750,
    root;
​
var tree = d3.layout.tree()
    .size([height/4, width]);
​
var diagonal = d3.svg.diagonal()
    .projection(function(d) { return [d.y, d.x]; });
​
var svg = d3.select("body").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 + ")");
  
/*var partition = d3.layout.partition()
    .value(function(d) { return d.size; });*/
  
var formatNumber = d3.format(",d");
  
function count_leaves(node){
    };
​
d3.json("data.json", function(error, flare) {
      data=flare
      
      var newData = { name :"Total Species", children : [] },
          levels = ["taxon_kingdom_name","taxon_phylum_name","taxon_class_name","taxon_order_name","taxon_family_name","taxon_genus_name","taxon_species_name"];
​
// For each data row, loop through the expected levels traversing the output tree
      data.forEach(function(d){
          // Keep this as a reference to the current level
          var depthCursor = newData.children;
          // Go down one level at a time
          levels.forEach(function( property, depth ){
​
              // Look to see if a branch has already been created
              var index;
              depthCursor.forEach(function(child,i){
                  if ( d[property] == child.name ) index = i;
              });
              // Add a branch if it isn't there
              if ( isNaN(index) ) {
                  depthCursor.push({ name : d[property], children : []});
                  index = depthCursor.length - 1;
              }
              // Now reference the new child array as we go deeper into the tree
              depthCursor = depthCursor[index].children;
              // This is a leaf, so add the last element to the specified branch
              if ( depth === levels.length - 2 ) depthCursor.push({ name : d.taxon_species_name, size : d.size });
          });
      });
      
  console.log(newData);
 
  if (error) throw error;
      
  
  root = newData;
  root.x0 = height / 2;
  root.y0 = 0;
​
  root.children.forEach(collapse);
  update(root);
});
​
d3.select(self.frameElement).style("height", "800px");
​
  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 * 180; });
​
      // Update the nodes…
      var node = svg.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("r", 1e-6)
          .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });
​
      nodeEnter.append("text")
          .attr("x", function(d) { return d.children || d._children ? -10 : 10; })
          .attr("dy", ".35em")
          .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; })
          .text(function(d) { return d.name; })
          .style("fill-opacity", 1e-6);
​
      // Transition nodes to their new position.
      var nodeUpdate = node.transition()
          .duration(duration)
          .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });
​
      nodeUpdate.select("circle")
          .attr("r", 7)
          .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.y + "," + source.x + ")"; })
          .remove();
​
      nodeExit.select("circle")
          .attr("r", 1e-6);
​
      nodeExit.select("text")
          .style("fill-opacity", 1e-6);
​
      // Update the links…
      var link = svg.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;
      });
}
​
// Toggle children on click.
function click(d) {
  if (d.children) {
    d._children = d.children;
    d.children = null;
  } else {
    d.children = d._children;
    d._children = null;
  }
  update(d);
}
​
</script>
​
    