Collapsible tree example with hyperlinks

from /mbostock/4339083

for http://stackoverflow.com/questions/14951392/add-hyperlink-to-node-text-on-a-collapsible-tree

Notes:

add a rectangle inside <a xlink:href="http://example.com", in front of the text box
add on("click ... " to the circle
add clickable and assign it to the rectangle

License: CC BY (4.0) about this license

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.node, .clickable {
  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>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>

var margin = {top: 20, right: 120, bottom: 20, left: 120},
    width = 960 - margin.right - margin.left,
    height = 800 - margin.top - margin.bottom;
    
var i = 0,
    duration = 750,
    root;

var tree = d3.layout.tree()
    .size([height, 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 + ")");

d3.json("/mbostock/4063550/example/flare.json", function(error, flare) {
  root = flare;
  root.x0 = height / 2;
  root.y0 = 0;

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

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 + ")"; })
      ;

nodeEnter.append("circle")
      .attr("r", 1e-6)
      .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; })
      .on("click", click)      
      ;

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);

nodeEnter
      .append("a")
         .attr("xlink:href", function (d) { return "https://www.example.com/flare/" + d.id; })
      .append("rect")
          .attr("class", "clickable")
          .attr("y", -6)
          .attr("x", function (d) { return d.children || d._children ? -60 : 10; })
          .attr("width", 50) //2*4.5)
          .attr("height", 12)
          .style("fill", "lightsteelblue")
          .style("fill-opacity", .3)        // set to 1e-6 to hide          
          ;

// 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", 4.5)
      .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>

Modified http://d3js.org/d3.v3.min.js to a secure url

Changed ajax call from /d/4063550/flare.json to /mbostock/4063550/example/flare.json.

https://d3js.org/d3.v3.min.js